CN204974994U - Novel chamfer of punching a hole fine blanking mould - Google Patents

Abstract

The utility model relates to a new punching and chamfering fine-blanking mold. A chamfering punch and a middle hole punch are fixed on the lower template of the mold. The middle hole punch is facing a convex and concave die, and the chamfering punch The top end protrudes from the die face of the die. Since the chamfering direction of the part is opposite to the stamping direction, the chamfering punch is fixed on the lower template. During the mold closing process, the chamfering punch moves together with the entire lower die, and the strip is protruded from the die surface by the top of the chamfering punch. Partially extrude to form the required chamfer. After the chamfer is formed, punch out the round hole with the middle hole punch at the next station to complete the punching and chamfer forming. Since the chamfer is first punched, the processed The position and size of the round hole are highly accurate.

Description

A New Type of Punching and Chamfering Fine Blanking Die

technical field

The utility model belongs to the design field of punching dies, and relates to a novel punching chamfering fine punching die, which is used for processing parts whose chamfering direction is opposite to the punching direction.

Background technique

The stamping die is the equipment used for pressure processing of materials. Its working principle is generally to drive the opening and closing surfaces of the upper die and the lower die through the die under the action of stamping to cut, punch, stretch, etc. the raw materials between them. Forming to form stampings. The fine blanking die is a new type of die in the field of existing product manufacturing. It is usually composed of a punch (or punch and die) and a die that cooperate up and down. The punch (or punch and die) is fixed by the upper backing plate, and the upper backing plate and The upper template is fixed, the die and the lower template are fixed.

The traditional method of processing round holes with chamfers is to punch the parts first, and then perform chamfering in machining. This processing method has low efficiency and high process cost. In order to solve this problem, people have designed a punching and chamfering die. In the previous station of the punching and chamfering die, a round hole is punched out, and then the chamfering is formed by extrusion in the latter station. However, in the actual production process, it is found that after extrusion and chamfering, the round hole is prone to deformation, which in turn affects its position and dimensional accuracy. Since the parts do not have high requirements on the dimensional accuracy of the chamfering, in order to ensure the position and dimensional accuracy of the round hole, the order of punching and chamfering can be changed, and the chamfering can be formed by extruding at the previous station of the mold , the latter station completes the punching, so it is necessary to improve the punching and chamfering die, and develop a new type of punching and chamfering fine punching die that can realize chamfering first and then punching.

Utility model content

The purpose of the utility model is to provide a new punching and chamfering fine punching die, which can realize the process sequence of first chamfering and then punching, and the position and size precision of the processed round hole is high.

The technical scheme that the utility model solves adopted is:

A new type of punching and chamfering fine-blanking die, which is used to process parts whose chamfering direction is opposite to the stamping direction. The plate is fixed on the bottom of the upper template, the guide plate is set on the bottom of the upper template, the convex and concave molds are set on the bottom of the upper backing plate, the convex and concave molds pass through the guide plate and cooperate with it, the lower mold includes a lower template and a concave mold, and the concave mold is set on the top of the lower template, It is characterized in that: the lower template is also fixed with a chamfering punch and a middle hole punch, the middle hole punch is facing the convex and concave die, and the top end of the chamfering punch protrudes from the die surface of the concave die.

As a further improvement of the present utility model, a ring-shaped chamfering block is provided on the top end surface of the chamfering punch, and the cross section of the chamfering block is triangular.

As a further improvement of the utility model, the lower mold is also provided with a main ejector, and the main ejector is facing the convex and concave molds.

The beneficial effects of the utility model are:

1. Since the chamfering direction of the part is opposite to the stamping direction, the chamfering punch is fixed on the lower template. During the mold closing process, the chamfering punch moves together with the entire lower die, and the strip is protruded from the top of the chamfering punch. Extrude the part of the surface to form the required chamfer. After the chamfer is formed, use the middle hole punch to punch out the round hole at the next station to complete the punching and chamfering. Since the hole is chamfered first and then punched, the position and dimension accuracy of the processed round hole is high. At the same time, the punching and blanking are completed synchronously, which prevents the plastic deformation of the round hole due to subsequent processing, and further improves the position and dimensional accuracy of the round hole.

2. When the diameter of the hole is large, if the chamfered round punch is directly used to extrude the chamfer, not only the extrusion force required is relatively large, but also the round punch with the chamfer needs to be designed as Floating form, complex structure, low stability. In the utility model, an annular chamfering block with a triangular cross-section is arranged on the top end surface of the chamfering punch. Due to the sharp structure at the top of the chamfering block, the deformation area is relatively small when the chamfering punch squeezes the strip during mold closing. Small, the chamfer can be extruded without a large extrusion force, so the chamfering punch can be directly fixed on the lower template, with a simple structure and high stability.

3. The main ejector facilitates the removal of parts after forming.

Description of drawings

Fig. 1 is a top view of the parts to be processed in this embodiment.

FIG. 2 is a sectional view of FIG. 1 .

Fig. 3 is a schematic structural view of the utility model.

Fig. 4 is a structural schematic diagram of a chamfering punch in the utility model.

In the figure: 1-upper template; 2-upper backing plate; 3-guide plate; 4-convex and concave die; 5-concave die; - Lower template.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

As shown in Fig. 1 and Fig. 2, it is the part diagram that needs processing in the present embodiment. The part has a large middle hole, and the bottom of the middle hole needs to be chamfered, and the chamfering direction of the part is opposite to the stamping direction.

As shown in Figure 3, a new type of punching and chamfering fine blanking die is used to process parts whose chamfering direction is opposite to the stamping direction, including an upper die and a lower die, and the upper die includes an upper template 1 and an upper backing plate 2 , the guide plate 3 and the convex and concave mold 4, the upper backing plate 2 is fixed on the bottom of the upper template 1, the guide plate 3 is arranged on the bottom of the upper template 1, the convex and concave mold 4 is arranged on the bottom of the upper backing plate 2, the convex and concave mold 4 passes through the guide plate 3 and cooperates with it, The lower mold includes a lower template 9 and a die 5, and the die 5 is arranged on the top of the lower template 9. Also fixed on the lower template 9 are a chamfering punch 8 and a middle hole punch 7, the middle hole punch 7 faces the convex and concave die 4, and the top of the chamfering punch 8 protrudes from the die surface of the die 5 .

Since the chamfering direction of the part is opposite to the stamping direction, the chamfering punch 8 is fixed on the lower template 9. During the mold closing process, the chamfering punch 8 moves together with the entire lower die, and the strip is drawn by the top of the chamfering punch 8. The part protruding from the die surface is extruded to form the required chamfer. After the chamfer is formed, punch out the round hole with the middle hole punch 7 at the next station to complete the punching and chamfer forming. Since the hole is chamfered first and then punched, the position and dimension accuracy of the processed round hole is high. Punching and blanking are completed simultaneously, which prevents the plastic deformation of the round hole due to subsequent processing, and further improves the position and dimensional accuracy of the round hole.

As shown in FIG. 3 , in this embodiment, the lower mold is further provided with a main ejector 6 , and the main ejector 6 is facing the male and female dies 4 . Main ejector 6 is convenient for taking out after part molding.

As shown in FIG. 4 , in this embodiment, a ring-shaped chamfering block is provided on the top end surface of the chamfering punch 8 , and the cross section of the chamfering block is triangular. When the diameter of the hole is large, if the chamfered round punch is directly used to extrude the chamfer, not only the extrusion force required is relatively large, but also the round punch with the chamfer needs to be designed as a floating Form, complex structure, low stability. In the utility model, an annular chamfering block with a triangular cross-section is arranged on the top end surface of the chamfering punch 8. Due to the sharp structure at the top of the chamfering block, the chamfering punch 8 is deformed when the strip is squeezed when the mold is closed. The area is small, and the chamfering can be extruded without a large extrusion force, so the chamfering punch 8 can be directly fixed on the lower template 9, and the structure is simple and the stability is high.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present utility model.

Claims (3)

1. a Novel punching chamfering fine blanking die, comprise upper die and lower die, described patrix comprises cope match-plate pattern, upper padding plate, guide plate and punch-die, upper padding plate is fixed on bottom cope match-plate pattern, guide plate is located at bottom cope match-plate pattern, punch-die is located at bottom upper padding plate, punch-die passes guide plate and is mated, described counterdie comprises lower bolster and die, die is located at lower bolster top, it is characterized in that: described lower bolster is also fixed with chamfer punch and interstitial hole drift, described interstitial hole drift is just to punch-die, and the die face of die is given prominence on the top of described chamfer punch.

2. a kind of Novel punching chamfering fine blanking die as claimed in claim 1, it is characterized in that: the top end face of described chamfer punch is provided with the chamfering block of a ring shape, the cross section of described chamfering block is triangular in shape.

3. a kind of Novel punching chamfering fine blanking die as claimed in claim 1, it is characterized in that: described counterdie is also provided with main ejector, described main ejector is just to punch-die.