CN204974952U - 12 jiao interior special drifts - Google Patents

Abstract

The utility model belongs to the field of machine tool cutting tools, in particular to a special punch with 12 angles inside. The 12 outer corners on the end face are downwardly formed with protrusions, the outer edge of the protrusions extends to the edge of the working end face, and the protrusions and the working end face form a step, and the height of the protrusions is 0.2 mm to 0.8 mm. The shape of the groove surrounded by the protrusions is a snowflake groove; the utility model has the advantages of simple structure, convenient use, long service life and no full circle of metal shavings.

Description

A special punch with internal 12 angles

technical field

The utility model belongs to the field of machine tools, in particular to a new special punch with 12 inner corners.

Background technique

With the development of modern industry in the current society, it is often necessary to use thick materials with small holes in many fields. In the forming and manufacturing process of these products, it is often necessary to use cold stamping dies for punching. The main structure of the mold includes the upper die body, the punch fixing plate, the punch, the stripping plate, the die, the die fixing plate, and the lower die body. When punching, the punch passes through the product like a puncher and enters the die, and pushes the cut waste into the lower die body.

In reality, the working end faces of the inner 12-angle punch are all flat, because the working end faces are flat, so when punching softer metals, because the metal is soft, the metal around the working end faces of the punch is prone to burrs at the same time, so that A circle of connected metal chips will be formed and stuck in the product, and it is very difficult to remove a circle of metal chips, which will also affect the service life and machining accuracy of the punch.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a new type of internal 12-angle special punch which is simple in structure, easy to use, long in service life, and will not produce a whole circle of metal shavings.

The purpose of this utility model is achieved in that:

A special punch with 12 inner angles, the working end face of the punch is in a 12-angle flower shape, each outer angle is 120°, each inner angle is 150°, and the 12 outer angles on the working end face are spaced downwards A protrusion is formed, the outer edge of the protrusion extends to the edge of the working end face, and the protrusion and the working end face form a step.

The height of the protrusion is 0.2 mm to 0.8 mm.

The shape of the groove surrounded by the protrusions is a snowflake groove.

The cross-section of the protrusion is 6 quadrilaterals evenly distributed on the periphery of the snowflake trough, the opposite angles of the 120° angles of the quadrilaterals are 60°, and the two adjacent angles are both 90°.

Compared with the prior art, the utility model has outstanding and beneficial technical effects as follows:

The utility model adopts the design of the snowflake groove. During the cold punching process, the protrusion of the punch first contacts the processing workpiece. After the protrusion deforms the processing surface for one end distance, the knife surface of the working end surface touches the processing workpiece. Continue to sink to complete the whole cold stamping process. Since the time when the protrusion of the punch and the knife surface of the working end face contact the workpiece is different, the time period for generating burrs is also different, so the metal chips produced are piece by piece, and will not It is a full circle, so that the metal chips can fall off by themselves and will not get stuck in the workpiece, thus ensuring the service life and machining accuracy of the punch.

Description of drawings

Figure 1 is a schematic diagram of the structure of the special punch for internal 12 angles.

Fig. 2 is a schematic diagram of the working end face of the internal 12-angle special punch.

1-Punch; 2-Protrusion; 3-Working end face.

detailed description

Below in conjunction with accompanying drawing, the utility model will be further described with specific embodiment:

A special punch with internal 12 angles, the working end surface 3 of the punch 1 is a 12-angle flower shape, each external angle is 120°, and each internal angle is 150°, the 12 external angles on the working end surface 3 are spaced apart There is a protrusion 2 formed downwards, the outer edge of the protrusion 2 extends to the edge of the working end face 3, and the protrusion 2 and the working end face 3 form a step.

The height of the protrusion 2 is 0.2 mm to 0.8 mm.

The shape of the groove surrounded by the protrusions 2 is a snowflake groove.

The cross section of the protrusion 2 is 6 quadrilaterals evenly distributed on the periphery of the snowflake groove, the opposite angle of the 120° angle of the quadrilateral is 60°, and the two adjacent angles are both 90°.

During the cold stamping process, the protrusion 2 of the punch 1 first contacts the workpiece to be machined, and after the protrusion 2 deforms the machined surface for one end distance, the knife surface of the working end surface 3 touches the workpiece to be machined, and the punch 1 continues to sink , to complete the entire cold punching process, because the time when the protrusion 2 of the punch 1 and the knife surface of the working end face 3 contact the workpiece is different, the time period for generating burrs is also different, so the metal chips produced are piece by piece, and will not It is a full circle, so that the metal chips can fall off by themselves and will not be stuck in the workpiece, thereby ensuring the service life and machining accuracy of the punch 1.

The utility model has the characteristics of simple structure, convenient use, long service life and no whole circle of metal shavings.

The basic principles and main features of the present utility model and the advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (4)

1. A special punch with 12 angles inside, the working end face of the punch is a 12-angle flower shape, each outer angle is 120°, and each inner angle is 150°, it is characterized in that the 12 angles on the working end face There are protrusions formed downward at intervals of the outer corners, the outer edge of the protrusions extends to the edge of the working end face, and the protrusions and the working end face form a step. 2. A special punch for internal 12 corners according to claim 1, characterized in that the height of the protrusion is 0.2 mm to 0.8 mm. 3. The internal 12-angle special punch according to claim 1 or 2, wherein the shape of the groove surrounded by the protrusion is a snowflake groove. 4. The internal 12-angle special punch according to claim 3, wherein the cross-section of the protrusion is 6 quadrilaterals evenly distributed on the periphery of the snowflake groove, and the 120° angle of the quadrilateral Diagonal angles are 60°, and adjacent angles are 90°.