TWM628968U - A composite metal punch - Google Patents

Abstract

A composite metal punch includes a front end or first layer having characteristic of anti-wearing located at the front end of the punch and an extending end or a second layer next to the first layer as an extending end, where the toughness of the first layer is greater than that of the second layer. The front end of the composite metal punch employs hardness material, and the rear end of it adopts toughness material, so that the processing part of the composite metal punch has sufficient strength to suffer continuous impact without deformation.

Description

A composite gold punch

This creation relates to a punch, especially a composite gold punch.

Many different types of tools have been used in metal forming applications such as machining, metal cutting, powder compaction, metal engraving, pin forging, component assembly, and more. Punch and die are representative types of metal forming tools used for piercing, punching and forming of metallic and non-metallic workpieces.

The punch is an important part of the cold stamping die. The die punch is generally made of high-speed steel and tungsten steel as materials, including high-speed steel punch and tungsten steel punch. The punch is installed on the stamping die to carry out continuous punching and punching operations, so that the material to be processed is separated or plastically deformed, and the desired finished or semi-finished product is obtained. According to the position at work, it can be divided into front punch and rear punch; according to the function of punch, it can be divided into: shaping punch, positioning punch, hole punching, forming punch, drawing punch, Slotted punches, punched punches, etc.; according to the shape, they can be divided into: round punches, square punches, pentagonal punches, hexagonal punches, octagonal punches, twelve-angle punches, plum blossom punches, and child-punch punches Special-shaped punches such as rods and star punches.

Tungsten steel punch is a new product that few companies can produce in recent years. It is mainly produced by cemented carbide, which requires high toughness of the material. The technical threshold for production is also relatively high, and the production cost is also high. It is widely used in stainless steel cold stamping. industry and heavy drawing fields.

Due to the requirements of economic and social development on production efficiency, high-performance punches are widely used, and tungsten steel punches, that is, carbide punches, are mostly used. The good properties of carbide punches largely surpass those of high-speed steel punches. Carbide punches used in precision molds have high precision requirements and product consistency. Each punch in mass production is required to meet the dimensional accuracy tolerance requirements, and the mold can be realized. Maximum service life. As a cemented carbide punch used with the mold, the consistency of the product is also critical.

Stamping die work is a continuous operation, and the service life of the hedging rod has become the focus. Depending on the material and thickness of the stamping, different alloy materials should be selected. In general, the thicker the stamped product, the lower the hardness and the better the toughness of the cemented carbide. The harder the material is, the harder the cemented carbide is to choose a slightly lower hardness model, which can effectively prevent the punch from being punched out. For punching relatively thin plates, or those with low hardness, for the hole processing of this product, carbide punches can be used with higher hardness, which can improve the service life of punching needles.

At present, in order to reduce the problem of die wear and tear due to large and fast punching, the industry generally uses tungsten carbide with high hardness and not easy to wear as the material of the male die, so as to reduce the loss and prolong its service life. Taking punching rods as an example, traditionally all tungsten steel punching rods are used because of their high hardness and rigidity, so their toughness and ductility are also low. Therefore, when impacted, all tungsten steel punching rods are prone to fracture due to insufficient toughness at the end. .

In view of the above problems, it is very necessary to improve the existing punch.

In view of the shortcomings of the above-mentioned conventional techniques, according to an embodiment of the present invention, a composite gold punch is proposed, which includes: a front end or a first layer, which is located at the front end of the composite gold punch and has anti-wear properties; and, a The extension end or the second layer is adjacent to the first layer as the extension end, and the hardness of the front end or the first layer is greater than that of the extension end or the second layer.

In a preferred embodiment, the punch including the front end or the first layer and the extension end (or the second layer) is integrally formed, and the front end (or the first layer) and the extension end ( or second layer) with different tungsten carbide alloy composition and hardness.

In a preferred embodiment, the toughness of the extension end (or the second layer) is greater than that of the front end (or the first layer).

In a preferred embodiment, the hardness gradient of the front end (or the first layer) and the hardness gradient of the extending end (or the second layer) are discontinuous changes.

In a preferred embodiment, the composition range of the front end (or the first layer) includes cobalt (Co) 5 to 26%, tungsten carbide (WC) 74 to 94%, chromium carbide (Cr ₃ C ₂ ) or other trace elements 1 to 3%.

In a preferred embodiment, the above-mentioned extended end (or second layer) composition ranges from 5 to 26% of cobalt (Co), 73 to 94% of tungsten carbide (WC), chromium carbide (Cr ₃ C ₂ ) or other trace amounts. Elements 1 to 3%.

In a preferred embodiment, the hardness (HRA) of the front end (or the first layer) ranges from 88 to 92.

In a preferred embodiment, the hardness (HRA) of the extending end (or the second layer) ranges from 80 to 88.

The above descriptions are used to illustrate the purpose, technical means and achievable effects of the present creation. Those familiar with the technology in the relevant fields can understand the present invention more clearly through the demonstration of the following embodiments and accompanying drawings and the scope of the patent application. invention.

100: Composite gold punch

101: Front end or first layer (anti-wear layer)

103: Extension end or second layer (ductile layer)

201: Processed parts

203: Fixtures

FIG. 1 shows a perspective view of a composite gold punch according to a preferred embodiment of the present invention.

FIG. 2 shows a cross-sectional view of a composite gold punch according to a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram showing the arrangement of the apparatus for applying the composite gold punch to a mold according to a preferred embodiment of the present invention.

The present invention will be described in detail with preferred embodiments and viewpoints. The following description provides specific implementation details of the present invention to provide the reader with a thorough understanding of how these embodiments are implemented. However, those skilled in the art will understand that the present invention can also be practiced without these details. In addition, some well-known structures or functions will not be described or described in detail in the text to avoid unnecessary confusion of related descriptions among various embodiments, and the terms used in the following description will be interpreted in the broadest reasonable manner even if they are related to A detailed description of a particular embodiment of the invention is used together.

According to the composite gold punch proposed in this work, as shown in Figure 1-2, the composite gold punch 100 is made of graded cemented carbide, that is, two materials are combined together, and the materials are pressed into sections in the form of powder. After sintering, the front end of the punch uses a material with higher hardness and wear resistance, while the rear end uses a material with better toughness. The composite gold punch made in this way has enough strength to endure uninterrupted impact at the processing part. At the same time, the processing part is made of cemented carbide, so it is not easy to deform under the continuous impact of the processing machine.

Please refer to FIG. 1 , which shows a perspective view of a composite gold punch 100 according to a preferred embodiment of the present invention. The punch has a plurality of layers of cemented carbide, and includes a front end or a first layer 101 located in the composite gold punch. The front end of the rod 100 has high hardness and anti-wear properties. The above-mentioned front end or the first layer can also be called the anti-wear end (layer); an extension end or the second layer 103 is adjacent to the front end (or the first layer) 101 As the extension end, the extension end or the second layer 103 has greater toughness than the front end (or the first layer) 101, and the extension end (or the second layer) 103 may also be called a toughness layer. The part of the above-mentioned anti-wear layer 101 in contact with the processing material and the processing machine is a hard alloy, and the above-mentioned toughness layer 103 is a hard alloy with better toughness, which is used to withstand the impact external force of the processing machine. Excessive impact external force will cause damage or deformation of the processing part, affecting the tolerance accuracy of the finished product. The hardness of the above-mentioned anti-wear layer is greater than that of the above-mentioned tough layer.

2 shows a cross-sectional view of the composite gold punch 100 proposed in the present invention, which shows a cross-sectional view of the first layer (anti-wear layer) 101 across the interface of the second layer (toughness layer) 103 .

The concept of the composite gold punch mentioned in this creation is to strengthen the hardness of the front end of the punch, Make it more wear-resistant, and strengthen the toughness of its rear end, making it more resistant to impact. The cross-sectional shape of the composite gold punch 100 can be a circle, a semicircle, an ellipse, a triangle, a quadrangle, a polygon (such as a pentagon, a hexagon, an octagon, a dodecagon, a hexagon, Dodecagon, etc.), plum blossom, star.

According to the embodiment of the present invention, the manufacturing method of the composite gold punch is to shape the metal powder material through the processing during forging, by means of impact or extrusion, so as to achieve the required mechanical properties of the composite gold punch. and shape, due to the forced molding of the metal powder material during the casting process, the metal powder material achieves mechanical properties such as densification, homogenization, toughness and impact resistance during the production process, and then the punching rod produced. Meets the strength required in processing. Among them, there are two purposes of processing and forming the composite gold punch by means of forging, which are "training" and "forming".

According to the aforementioned "training", the purpose is as follows: one is to eliminate the internal defects of the material, such as shrinkage holes, pores, etc., especially in the process of forging, if the internal defects of the material are not handled properly, it will affect the finished product. The actual hardness and toughness; the second is to improve the crystal structure, so that the material is more closely combined in the microstructure. In addition, "molding" is to transform the powder material into the desired shape, and its purpose is to save the energy, material and time consumed by mechanical cutting.

According to the embodiment of the present invention, the manufacturing of the composite gold punch is based on the requirements of hardness and toughness of each layer, after the metal material powder is prepared in layers in an appropriate proportion, and the metal of the tough layer is mixed according to the design of the composite gold punch. The material powder is pre-pressed and formed, and then the metal material powder of the anti-wear layer is filled on it and pressed and formed again, so that the composite gold punch has the properties of a gradient of hardness and toughness.

According to an embodiment of the present invention, the punch including the front end (or the first layer) and the extension end (or the second layer) is integrally formed, and the front end (or the first layer) and the extension end (or the second layer) are integrally formed. The ends (or second layers) have different tungsten carbide alloy compositions and hardnesses.

According to the embodiment of the present invention, the particle size of the tungsten carbide (WC) formed during the sintering process can be controlled by adding chromium carbide (Cr ₃ C ₂ ). In the sintering process, in order to form a completely dense material, the tungsten carbide (WC) particles need to be combined and grown through the process of dissolution and precipitation during the liquid phase sintering process. speed, need to add chromium carbide. In one embodiment, the chromium carbide can also be replaced by carbides of trace elements such as vanadium carbide (VC), titanium carbide (TiC), tantalum carbide (TaC) or niobium carbide (NbC).

According to the content of this creation, the composition range of the above-mentioned anti-wear layer 101 is: cobalt (Co) 5-26%, tungsten carbide (WC) 74-94%, chromium carbide (Cr ₃ C ₂ ) or other trace elements 1-3 %.

According to the content of this creation, the composition range of the above-mentioned tough layer 103 is: cobalt (Co) 5 to 26%, tungsten carbide (WC) 73 to 94%, chromium carbide (Cr ₃ C ₂ ) or other trace elements 1 to 3% .

According to the content of the present invention, the particle size of the tungsten carbide (WC) in the composite gold punch 100 is 0.5 to 15 μm.

According to the content of the present invention, the hardness gradient of the front end or the anti-wear layer 101 and the hardness gradient of the toughness layer 103 are discontinuous changes.

According to an embodiment of the present invention, the hardness (HRA) of the front end or the anti-wear layer 101 ranges from 88 to 92.

According to an embodiment of the present invention, the hardness (HRA) of the extension end or the tough layer 103 ranges from 80 to 88.

FIG. 3 shows a schematic diagram of a device for applying a composite gold punch 100 to a mold, wherein the workpiece 201, such as the punched part, is carried and fixed by a fixture 203, and the punched part is held by a composite gold punch 100 to the punched part. parts for processing. The above-mentioned punch is a composite gold punch made of the anti-wear layer 101 with high hardness at the front end and the toughness layer with high toughness at the rear end, and has the property of gradient in hardness and toughness.

The above embodiments are only used to illustrate the technical solutions of the present creation, but not to limit it; although the present creation and its benefits are described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should Understand that it is still possible to modify the descriptions in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the claims of the present creation.

100: Composite gold punch

101: Front end or first layer (anti-wear layer)

103: Extension end or second layer (ductile layer)

Claims (8)

A composite gold punch, comprising: a front end located at one end of the composite gold punch with anti-wear properties; and an extension end adjacent to the front end as an extension, the front end having a hardness greater than the extension end; wherein the composite gold punch The cross section of the rod is circle, semicircle, ellipse, triangle, quadrangle, polygon, plum blossom and star. The composite gold punch as claimed in claim 1, wherein the composite gold punch including the front end and the extension end is integrally formed, and the front end and the extension end have different tungsten carbide alloy compositions and hardnesses. The composite gold punch as claimed in claim 1, wherein the toughness of the extension end is greater than that of the front end. The composite gold punch as claimed in claim 1, wherein the hardness gradient of the front end and the hardness of the extending end vary discontinuously. The composite gold punch as claimed in claim 2, wherein the front end composition ranges from 5 to 26% of cobalt (Co), 74 to 94% of tungsten carbide (WC), chromium carbide (Cr ₃ C ₂ ) or other trace elements 1 to 3%. The composite gold punch as claimed in claim 5, wherein the front end hardness (HRA) ranges from 88 to 92. The composite gold punch as claimed in claim 2, wherein the above-mentioned extended end composition ranges from 5 to 26% of cobalt (Co), 73 to 94% of tungsten carbide (WC), chromium carbide (Cr ₃ C ₂ ) or other trace elements 1 to 3%. The composite gold punch as claimed in claim 7, wherein the hardness (HRA) of the extending end ranges from 80 to 88.

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