March 30, 2018

3D glass bending machine tungsten carbide hot plate

With the advent of the era of 5G, mobile phone 3D glass screen and back cover will be into explosive growth, the most important thing is to hot bending glass lenses production process of forming. In the hot bending machine evenly heat in the process of high temperature hot pressing glass, you need to use to the high temperature resistant, thermal conductivity of the powder metallurgy soaking plate to heat evenly hot pressing operations.

We use tungsten carbide has good strength and toughness, coefficient of thermal conductivity to the principle of increase and decrease with increasing of tungsten carbide plate, tungsten carbide of coefficient of thermal conductivity is greater than the titanium carbide, adding nickel, chromium carbide can effectively inhibit alloy creep, improve the ability to resist plastic deformation, and can improve the corrosion resistance ability; Molybdenum carbide with high melting point and hardness, good thermal stability and mechanical stability and excellent corrosion resistance, etc, tantalum carbide can improve the product high temperature hardness, strength and resistance to high temperature oxidation, the development of the cemented carbide soaking plate has high hardness, good strength, high temperature resistant, high temperature oxidation resistance, good thermal conductivity and high temperature uniformity, completely meet the requirements of the 3D glass bending machine.

The most important part of the 3D glass production process is hot bending. Hot bending core workspace heating temperature often reaches 850 ℃ to 950 ℃ to 1150 ℃ or higher, so high temperature hot bending machine soaking for 3D glass tungsten carbide plate is to have special requirements, and glass material under the condition of high temperature have strong corrosion effect. It should not only guarantee the density of soaking slab high hardness, and to ensure that the high-temperature thermal deformation and strong corrosion resistance, this undoubtedly for powder metallurgy new material is a kind of new material application requirements and challenges. The tungsten carbide soaking plate of our company has excellent high temperature hardness, high thermal conductivity, thermal stability, high temperature resistant deformation and excellent anti-corrosion resistance.

The main process production directly affects the use performance of 3D glass thermal bending machine.

1. Preparation process of mixture.

The physical and chemical properties of tungsten carbide plate are controlled by the optimum composition ratio, including the room temperature and high temperature hardness, corrosion resistance, oxidation resistance, bending resistance and compressive strength. The grinding stability of each batch of mixture is controlled by the ball milling factor, including the distribution of WC particle size, the distribution of hard phase and bond phase, to control the fluctuation of the physical properties of the alloy.

2. Pressing process

It can be used to control the sintering deformation of the alloy and reduce the internal stress of the alloy.

3. Sintering process

Through multiple atmosphere removal compact forming agent, strictly control the compact surface and core, the boat interface and boat interface carbon potential, and through the optimal control in the process of alloy in sintering temperature curve to contraction, strictly control the size of the alloy, parallelism and minimal internal stress.

4. Heat treatment process

Make the best heat treatment process, through high temperature quenching change phase structure of the binding phase, related components dissolved in full, to strengthen the binding phase, improve alloy strong toughness and corrosion resistance, and eliminate alloy produced in the process of sintering shrinkage internal stress, good for alloy after surface finish.

5. Aging treatment process.

After grinding, the tungsten carbide is treated by aging process, and the processing stress produced by alloy in fine grinding is treated, and the dimension and parallelism of the alloy are controlled.


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March 23, 2018

Tungsten carbide spade drill

Tungsten carbide spade drill is made up of handle and blade. Normally, the shank of a hard alloy spade is made of steel, and the blade of the convertible head is made of hard alloy. The hilt has two structures: the side handle and the Morse handle. It is used for CNC lathe and CNC machine tool. The Morse handle is used in traditional equipment such as vertical drilling, rocker drill and pusher. By simply installing a cooling ring device, the external cooling can be converted to internal cooling. The cooling water enters the tool rod through the cooling ring and is cooled directly to the blade section through the internal cooling hole. And the high pressure of the cooling water is more conducive to defecation.
The blade can also be divided into two types, carbide blade and high speed steel blade. The range of carbide blades ranges from 9mm to 32mm. The range of high-speed steel blades ranges from 9mm to 68mm, and part of the non-standard blade can even be made larger. The high speed steel blade is generally cobalt high speed steel with 8% cobalt, which has good wear resistance and toughness. However, the performance of the carbide blade is much better than the steel blade, and the service life is relatively long.
The tungsten carbide spade drill is positioned through the groove, and the two screw holes are fixed and fixed, which can ensure the symmetry of the blade between 0.01 and 0.02mm. According to the size of the blade, there are usually 2 to 6 chip slots. According to the different cutting materials, the tip of the blade is X - shaped drill point or s-shaped drill tip.
Advantages of hard alloy shovel drilling
A deep hole that is easy to double. The blade is a symmetrical structure with double edge cutting in the center, and it is made of tungsten carbide, so it can reach even the deep hole of 20D. The ordinary U drill, the shallow hole drill can not hit the deep hole, can be completed by the shovel.
The hard alloy shovel can be widely used in traditional machine tools such as rocker drill. Traditional machine tools are not able to be used because of low spindle speed, poor rigidity, weak power, general fast drilling, and U drill. And the spatula is made of hard alloy coating blade, which has high toughness and impact resistance, and can effectively solve the problem of collapsing blade.
The accuracy of tungsten carbide spade drill is much higher than that of U drill. A U drill is a blade that installs two asymmetric cutting blades. Blade cut into the workpiece surface, within the blade on the blade and the blade of axial force is not balanced, will cause the change of size, so U boring only as rough machining cutter, precision of + / - 0.1 mm. Blade symmetry cutting, the dimension precision can be controlled within 5 threads. Direct drilling can meet the requirement of thread bottom hole. The side of the shovel blade is trimmed with a smooth blade, which can reach RA1.6 through the extrusion of the polished blade belt.

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March 21, 2018

Tungsten carbide type O seals

Tungsten carbide type O seals is a kind of seals with circular cross section. Mainly used for mechanical components to prevent leakage of liquid and gaseous media under static conditions. In some cases, tungsten carbide type O seals can be used as dynamic sealing element axially reciprocating motion and low-speed rotational movement.

Application of tungsten carbide seals for Type O

Tungsten carbide type O sealsis widely used in kinds of machines, which is for sealing at predetermined temperature, pressure, various liquid and gaseous media, at rest or in motion state. As a seal element on machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastics machinery, agricultural machinery, and a variety of instruments. Seals is mainly used for static and reciprocating seals. When the seals for rotary motion, it is only as sealing device of low-speed rotary. Tungsten carbide type O seals is typically installed on the outer or inner circular cross-section from the seal rectangular groove.

Properties

Tungsten carbide type O sealswith excellent sealing, damping effect in the oil, acid, wear, chemical attack and other environments. So the carbide seals is the most widely used as seal in hydraulic and pneumatic drive system. Tungsten carbidetype O seals sealing action of its own, not a cyclical adjustment, can be used to seal against the direction of movement of the sliding seal impact, small size at the same time easy to use, because of the large seal adaptability, so a very wide range of applications. But the pressure reaches a certain peak of easily deformed under pressure, there is the possibility to extrusion gap, with more application in terms of aviation and hydraulic engineering.

We'd better try to use a large cross-section of the O-ring. In the case of same space, the volume of carbide O-ring is extruded into the gap should be smaller than it is to squeeze the maximum allowable value. Different types of fixed seal or dynamic seal applications, carbide O-ring provides designers with an effective and economical sealing element. Carbide O-ring is a double-acting sealing element. Initial installation aspects radial or axial compression, giving O-ring seal its initial capacity. Sealing force generated by the pressure of the system and the total synthesis of the initial sealing force of the sealing force, with which to improve the system pressure increases. Carbide O-ring seal in the static case, display a prominent role. However, where appropriate dynamic, the cemented carbide O-rings are often used, but it is limited by the speed of seals and pressure.
Related link: http://www.wococarbide.com/Transaction/en_information.html

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Tungsten carbide type O seals

Tungsten carbide type O seals is a kind of seals with circular cross section. Mainly used for mechanical components to prevent leakage of liquid and gaseous media under static conditions. In some cases, tungsten carbide type O seals can be used as dynamic sealing element axially reciprocating motion and low-speed rotational movement.

Application of tungsten carbide seals for Type O

Tungsten carbide type O seals is widely used in kinds of machines, which is for sealing at predetermined temperature, pressure, various liquid and gaseous media, at rest or in motion state. As a seal element on machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastics machinery, agricultural machinery, and a variety of instruments. Seals is mainly used for static and reciprocating seals. When the seals for rotary motion, it is only as sealing device of low-speed rotary. Tungsten carbide type O seals is typically installed on the outer or inner circular cross-section from the seal rectangular groove.

Properties

Tungsten carbide type O seals with excellent sealing, damping effect in the oil, acid, wear, chemical attack and other environments. So the carbide seals is the most widely used as seal in hydraulic and pneumatic drive system. Tungsten carbide type O seals sealing action of its own, not a cyclical adjustment, can be used to seal against the direction of movement of the sliding seal impact, small size at the same time easy to use, because of the large seal adaptability, so a very wide range of applications. But the pressure reaches a certain peak of easily deformed under pressure, there is the possibility to extrusion gap, with more application in terms of aviation and hydraulic engineering.

We'd better try to use a large cross-section of the O-ring. In the case of same space, the volume of carbide O-ring is extruded into the gap should be smaller than it is to squeeze the maximum allowable value. Different types of fixed seal or dynamic seal applications, carbide O-ring provides designers with an effective and economical sealing element. Carbide O-ring is a double-acting sealing element. Initial installation aspects radial or axial compression, giving O-ring seal its initial capacity. Sealing force generated by the pressure of the system and the total synthesis of the initial sealing force of the sealing force, with which to improve the system pressure increases. Carbide O-ring seal in the static case, display a prominent role. However, where appropriate dynamic, the cemented carbide O-rings are often used, but it is limited by the speed of seals and pressure.

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March 16, 2018

Tungsten carbide rod with coolant hole

Tungsten carbide rod with coolant hole is made of hard alloy material, which is mainly used to process various hard alloy cooling holes. It works mainly by carbide rod internal spiral cooling hole hole, the coolant under high pressure to the cutting edge, so as to reduce the bit especially the bit at the top of the high temperature. At the same time, the chip can be removed from the side, so as to effectively remove the debris and greatly improve the surface finish of the workpiece.

It is more common to extend the life of drill bit by external cooling process. With the wide application of this process, however, many users find that in this process, because the debris in the manufacturing process of continuous discharge, to some extent hindered the coolant reached the top of the tool, to reach the ideal cooling effect. At the same time, with the increase of machining depth, the effect of external cooling process is worse and worse, and it may hinder the expulsion of chip. Therefore, the internal cooling process is present, and the application of  tungsten carbide rod with coolant hole is more and more extensive.

It has the advantages of good cooling effect, high cutting efficiency and long service life. In the process of carbide bit machining, the coolant is sent to the cutting edge under high pressure through the hole in the drill bit. Such as coolant quickly delivered in a timely manner, can quickly reduce the cobalt high temperature especially the bit at the top of the head, scraps discharge from the side, at the same time can be carried on effectively will produce chip removal, improve the surface finish. According to the research, the hard alloy bit produced by tungsten carbide rod with coolant hole can not only improve the efficiency of the deep hole processing, but also nearly double the service life of the tool.

At present, the production technology of the world's spiral carbide cooling hole rods is:

Mosaic method: the surface of tungsten carbide bar is machined into a spiral groove and then pressed into a hard alloy tube. However, the method is complicated, the expansion coefficient adjustment and control difficulty of alloy mixing are difficult, and the dimension control is difficult. Also can be in machining the spiral groove and casing pressure in the extrusion molding, however, for the combination, the thinner the wall, the better, as the rotation, tooth surface as wide as possible, so the mold manufacturing difficulty, and a set of can only make one size carbide rod cooling hole.

 

External screw extruding method: 1.the concave mold diameter belt is provided with thread, the material is extruded by rotation; Cooling hole core rod thread slot must cooperate with manufacture and concave die, the technology design of the die is relatively complex, mould die and core rod must be in sync, otherwise will cause out-of-tolerance size parameters, cooling distributed partial or crack. 2. the concave mold active rotation drives the material to rotate, simultaneously guides the nylon wire embedded in the material. The dragon silk (soft core) needs to be guided into the inside, and the shape and size of the screw hole is difficult to control, and if the process limits the screw hole specification and the length of the rod in the later stage of burning; The outer surface quality is difficult to control when the rod rotates forward. External screw extrusion is a kind of molding technology which is widely used at home and abroad.

 

Internal screw extrusion method: using the special structure of twin-screw extruder, the core rods extends to the screw extruding, use the screw driver core rod rotation or drive core rod elastic needle in the rotation, to shape the screw hole; The die design of this process is simple, but the squeeze parameter is strict, and the extrusion speed and the core speed of the material must be matched. Otherwise, the size parameter of tungsten carbide rod with coolant hole cannot meet the requirement. Because of the difficulty of this technology, only a few foreign companies such as konard friedrichs in Germany can produce, and there is no such technology in China. The technology to meet the speed matching, core rod manufacturing, flexible needle should correspond with the performance of extruder screw extrusion speed and speed matching, limiting the generality of the same equipment and can produce the specifications of the bar is kind.

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March 14, 2018

Tungsten alloy rod added mo

Tungsten Alloy Rod Added Mo Introduction

Tungsten alloy rod added Mo(WMoNiFe), similar to one type of famous brand rod, is a tungsten-based material made through special high temperature powder metallurgy techniques. This kind of WMoNiFe material has a low coefficient of thermal expansion, good thermal conductivity and excellent properties at elevated temperatures. Tungsten alloy rod added mo(WMoNiFe) can be used as welding rod due to its high melting point and low coefficient of thermal expansion. Elements added to tungsten alloy rod can enhance machinability, ductility and welding properties. Material properties are very important for tungsten alloy rod added mo to be much proper while associating other tool materials by heat treatment.

Tungsten Alloy Rod Added Mo Typical Application

tungsten alloy rod added mo

Tungsten alloy rod added mo is used in electrobrazing applications where heat balance is important. The tungsten alloy rod added mo(WMoNiFe) is similar to one type of famous brand rod with good anti-sticking qualities, high temperature abrasion and hardness properties. The oxidation resistance of both tungsten alloy rod is excellent up to 1100oF.

WMoNiFe is used as a base due to its high melting point and low coefficient of thermal expansion. These properties of tungsten alloy rod added mo result in less thermal cracking and soldering with the die cast or extruded material while welding. Elements of tungsten alloy rod added as WMoNiFe imporve its machinability, ductility and welding properties. The good thermal conductivity provides additional benefits to increase cooling to cool areas and potentially increases production rates. Material properties ensure tungsten alloy rod added mo easiler to be associated with heat treatment of other tool materials.

Tungsten Alloy Rod Added Mo Benefits:tungsten alloy rod added mo

Removes heat four times faster than traditional tool steel

Reduces sticking

Low erosion rate

Provides additional cooling

Readily machinable

Worn parts are easily re-machined into smaller diameter core pins or larger extrusion dies

Requires no pre or post machining heat treatment

Easily welded and repaired with Welding Rod

Contains no Beryllium

Tungsten Alloy Rod Added Mo Results

tungsten alloy rod added mo

Longer die and core life

Less production downtime

Better surface finishes on products

Fewer rejects

Lower cost per piece

Less porosity in heavy sections

Faster cycle times

Tungsten Alloy Rod Added Mo Availability:

Tungsten alloy rod added mo can be finished as per customized shape and size. Material is in rough oversize to be finished as round bars rages from 3/16 inch to 4inch dia. x 12inch long. Rectangular bars and finished tungsten alloy rod added mo can be readily manufactured to specifications.

The high density of tungsten carbide tool shrinks considerably during sintering. Depending upon design of tungsten alloy rod added mo and configuration, parts may be pressed and sintered close to final size and configuration to minimize machining costs. Special shapes of tungsten alloy can often be pressed in the die and sintered to near net shape. 

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March 08, 2018

How to reduce the thermal stress of tungsten carbide blank during welding process

Tungsten carbide blanks are very common materials for cutting tools: and for example, saw blades, lathe bits, drill bits, milling cutters and dental drilling tips are usually made of hard alloys. It can make these blades longer than most other materials, so they are popular among these carbide tools.

Tungsten carbide blank is made of a cemented carbide crown on the steel drill body. This drill adopts self-centering blade geometry, cutting force is small, on the eve of the eve of the workpiece material all can achieve excellent chip control, machining the hole of finish good, dimensional accuracy and positioning precision is very high, no longer for subsequent finishing. The drill adopts internal cooling system, which can be used in machining center, CNC lathe or other high rigidity, high speed machine tool.

Replaceable tungsten carbide blank

Replaceable carbide blank is a new generation drilling tool. It is composed of steel and can be a change in solid carbide drill body crown, compared with welding type carbide drill, its machining precision eight half of it, but because of the tooth crown can be changed,which can reduce processing costs, improve the drilling rate. This kind of drill bits can obtain the precise aperture size increment and has the self-centering function.

Production of tungsten carbide blank

The distance between tungsten carbide plate and the slot surface is 0.3~ 0.5mm for each side and 0.1~ 0.15mm for the non-compensation gasket. The compensation gasket is used to reduce the thermal stress during welding of alloy sheet. The compensation gasket can be made of low carbon steel wire mesh or copper sheet. Its width and length are equal to that of alloy plates. For tungsten carbide plates with no compensation gaskets, they shall be fixed in the required position by means of inlaying.

Application and properties of tungsten carbide blanks

1. It can be suitable for drilling with more complex materials, and can choose higher cutting speed.

2. High performance alloy blade for selected alloy bits, effectively reduce the collapse knife and maintain good wear resistance.

3. Multi-layer geometric cutting edge, improve drainage performance, and maintain small cutting resistance.

4. In addition to the usual rectangular handle, it is equipped with a variety of handles, suitable for various drilling machines and drilling machines.

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March 02, 2018

Type of ceramic inserts and applicable to processing material

As non-metal tool materials, ceramics are widely used in metal cutting. As heat resistant alloy materials, such as Inconel alloy parts in aerospace industry and other industry increasingly extensive application, puts forward higher requirements for cutting tool, so the ceramic insert was born, the more difficult to machining materials exhibit excellent cutting performance.

Ceramic inserts are manufactured in very similar ways to carbide inserts. Because ceramics do not bond as easily as other materials, they must be subjected to much higher temperature and pressure during sintering.

Ceramic inserts although its hardness, high wear resistance compared with carbide insert a lot, but big brittleness is the biggest flaw, thus failed to get a good development, only for less than the amount of finish machining process, and to avoid discontinuous cutting process. Therefore, when choosing the insert number, it is better to consult the cutter engineer of the enterprise, and choose the product to recommend the product to be more reliable.

Ceramic inserts than compared carbide insert, can bear the high temperature of 2000 degrees, and hard alloy at 800 degrees is soft; Therefore, ceramic inserts have high temperature chemical stability and can be machined at high speed, but the disadvantage is that alumina ceramic inserts are very low in strength and toughness and are easily broken. Because of ceramic inserts, high temperature resistant, high temperature and high speed cutting is more advantageous, because the ceramic low thermal conductivity, high temperature, just on the tip of the heat generated by the high speed cutting as chip away, so most researchers think: alumina ceramic inserts can, and the best above 10 times that of the cemented carbide cutting tools under linear velocity, can truly reflect the advantages of ceramic insert.

In order to reduce the sensitivity of the ceramic insert to the crushing, in an attempt to improve its toughness and improve the impact resistance, it added zirconia or added a mixture of titanium carbide and titanium nitride. Although added to these additives, ceramic inserts are much less tough than carbide inserts.

Another improve alumina ceramic insert toughness method is to add crystal texture in material or silicon carbide whisker, through these special on average only about 1 nm in diameter, 20 microns long strong whisker, significantly increased the toughness, strength and thermal shock resistance of ceramics. It is restricted by its impact toughness and has been used in the field of fine car processing.

Like alumina ceramic inserts, silicon nitride ceramic inserts have higher thermal hardness than hard alloy inserts. It is also good for high temperature and mechanical shock. Compared with alumina ceramic insert, its disadvantage is that it has insufficient chemical stability in processing steel. However, a silicon nitride ceramic insert can be used to process gray cast iron at 1450 feet per minute or higher.

Ceramic inserts are applicable to processing materials: ceramic inserts can not be used for aluminum processing, but they are especially suitable for gray cast iron, ductile iron, hardened steel and certain unhardened steel and heat-resistant alloys. However, for these materials, the application of ceramic inserts is successful, and the appearance and micro-quality assurance of insert edge is required, and the optimal cutting parameters are required.

Related link:

http://www.wococarbide.com/

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March 01, 2018

Tungsten carbide center drill

Tungsten carbide center drill is used for machining center hole on the end face of shaft and other parts. It is used for the prefabrication of hole processing to guide the hole machining and reduce the error. The center drill is light and defecate.

More and more processing workshops are replacing gun drilling with solid carbide bits. Some solid carbide drill manufacturers think, this kind of bit performance advantage for those who are on his lathe with gun drill deep hole processing, or the deep hole processing tasks subcontract processing workshops of gun drill manufacturers have more and more attractive. However, compared with the tungsten carbide center drill, which is usually made of hard alloy or hardened high speed steel drill point, hardened steel shank and straight slot, there are some limitations in the overall hard alloy deep hole drill. For example, their borehole depth limit (dimensioning) is 40 times the aperture, while a gun drill can easily drill a deep hole with a depth of 50 times the aperture.

There are two types of tungsten carbide center drill: type A: center drill with no cone, type B: center drill with A cone, and A center hole with A diameter of 1~10mm, usually with A center drill without A cone (type A); In order to avoid the damage of the 60-degree centering cone, the center drill with the cone is generally adopted.

Tungsten carbide center hole is the positioning base of the shaft type workpiece mounted on the top. Center hole of 60 degrees taper hole to match the top 60 degrees on the cone; A small round hole in the inner side to ensure that the conical hole is matched with the top cone, and a small amount of lubricating oil (butter) can be stored. The central holes are commonly found in type A and type B. Type A center hole only 60 degrees taper hole. Type B center hole outside the 120 degrees cone cone is also called the protection, to protect the 60 degrees taper hole edge is not being damaged. Type A and type B center holes are machined on lathe or special machine tool respectively with corresponding center. Before machining center hole, the end face of the shaft should be leveled to prevent the center from breaking. The peak Angle of the standard center drill is generally 118 degrees.

Instructions for use of alloy center drill

1. The user must choose the model of the center drill according to the holes of the processed parts and the size of the straight hole.

2. The hardness of the workpiece is best between 170-200hb.

3. Before using the tool, it must be cleaned and anti-rust grease, so as to prevent the cutting chip from sticking to the blade and affecting the performance.

4. The surface of the machined workpiece should be flat, and there should be no sand or hard points, so as to avoid the cutting of the tool.

5. The center drill before drilling should reach the desired position accuracy.

6. Cutting amount

7. Cutting fluid: select different cutting fluid according to the processing object, and the cooling should be sufficient.

8. Matters needing attention: the abnormal situation should be stopped immediately during processing, and the cause can be processed after checking the cause; Pay attention to the abrasion of the cutting edge; After using the tool, clean the oil and keep it properly.

Related link:

http://www.wococarbide.com/Library/index.html

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