Punch forming die

Abstract

The utility model discloses a punch forming die which comprises an upper die plate and a lower die plate, the upper die plate is movably arranged, a forming male die is fixedly installed at the bottom of the upper die plate, and a forming female die is fixedly installed at the top of the lower die plate. The top of the punching rod is lower than the top of the forming male die, the material pressing plate is elastically connected to the upper die plate, the punching rod is fixedly connected to the upper die plate, the material pressing plate is provided with a through hole for the punching rod to freely pass through, in the natural state, the top of the punching rod and the top of the forming male die do not protrude out of the lower end face of the material pressing plate, and a positioning hole is formed in the position, corresponding to the punching rod, of the forming female die. In the working process, when the upper die plate moves downwards, before the forming male die makes contact with a workpiece, the pressing plate tightly presses the workpiece, and the punching rod punches a mounting hole in the workpiece and enters the positioning hole to position the mounting hole. The stamping die is simple in process, can finish drawing forming of a workpiece through one-time stamping action, and guarantees accurate positions of an outer circle and a mounting hole of the workpiece.

Description

Technical Field

[0001] This utility model relates to a die for stamping thin metal sheets, specifically a stamping die for stretching and forming circular end caps. Background Technology

[0002] For the stretch forming of circular end caps, the outer diameter of the end cap will be smaller after stretching. Therefore, a margin is usually left, and the outer diameter of the end cap is punched after forming to meet the specified size requirements, which makes the process more complicated. In addition, for circular end caps with multiple mounting holes, the position, spacing and shape of these holes will change after stretching, which may not meet the accuracy requirements. The holes also need to be punched after stretching, which makes the process more complicated. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a stamping die with a simple process that can complete the stretching and forming of the workpiece in one stamping action and ensure the accurate position of the outer circle and mounting hole of the workpiece.

[0004] This utility model is implemented through the following technical solution:

[0005] A stamping die includes an upper die and a lower die. The upper die is movably mounted, and the lower die is fixedly mounted. A forming punch is fixedly mounted at the bottom of the upper die, and a forming die is fixedly mounted at the top of the lower die. The forming punch is characterized by a pressure plate and punches around its periphery. There are at least six punches, with the top of each punch lower than the top of the forming punch. The pressure plate is elastically connected to the upper die, and the punches are fixedly connected to the upper die. The pressure plate has through holes to allow the punches to pass freely. In its natural state, neither the top of the punches nor the top of the forming punch protrudes from the lower end face of the pressure plate. The forming die has positioning holes corresponding to the positions of the punches. During operation, when the upper die moves downward and before the forming punch contacts the workpiece, the pressure plate presses the workpiece, and the punches punch mounting holes in the workpiece and enter the positioning holes to position the mounting holes.

[0006] The upper edge of the forming die is provided with a stop for positioning the outer circle of the workpiece, and the height of the stop is less than the thickness of the workpiece.

[0007] The bottom of the forming cavity of the forming die is equipped with a stripper rod, which is installed on a movable plate. The movable plate and the upper template move up and down synchronously.

[0008] The movable panel and the upper template are detachably connected via side panels. The upper end of the side panel is connected to the side of the upper template, and the lower end of the side panel is connected to the side of the movable panel.

[0009] In the stamping die using the above technical solution, before the forming punch contacts the workpiece and performs the stretching action, a pressure plate first presses the workpiece tightly to prevent the outer diameter of the workpiece from being pulled as much as possible. At the same time, a punch punches a mounting hole on the workpiece and enters the positioning hole to position the mounting hole. At this time, the punch serves two purposes: first, it assists the pressure plate in pressing the workpiece to ensure that the outer diameter of the workpiece does not shrink when the workpiece is subsequently stretched; second, it ensures that the size, position, and shape of the mounting hole punched on the workpiece are accurate when the workpiece is subsequently stretched. Then, the forming punch contacts the workpiece until the upper and lower molds close, and the forming die works together to stretch and form the workpiece. In this way, the outer diameter and the position of the mounting hole of the workpiece can be well guaranteed after stretching and forming. Attached Figure Description

[0010] The present invention includes the following figures:

[0011] Figure 1 This is a structural diagram of the workpiece formed according to this utility model.

[0012] Figure 2 for Figure 1 Axial sectional view,

[0013] Figure 3 This is a structural diagram of the present invention before operation.

[0014] Figure 4 This is a schematic diagram of the structure of this utility model before the punch contacts the workpiece.

[0015] Figure 5 This is a schematic diagram of the structure of the present invention when the mold is closed.

[0016] In the figure: 1. Forming punch; 2. Upper template; 3. Punch pin; 4. Pressure plate; 5. Positioning hole; 6. Forming die; 7. Lower template; 8. Movable plate; 9. Stripping ejector pin; 10. Side plate; 11. Side flange; 21. Outer circle of workpiece; 22. Workpiece stretching and forming part; 23. Workpiece mounting hole. Detailed Implementation

[0017] like Figure 1-2 As shown, the workpiece formed by this utility model is a circular end cap type part, which has an outer circle 21 of a certain size and a middle stretching and forming part 22, and also has 6 mounting holes 23.

[0018] like Figure 3-5As shown, this utility model discloses a stamping die, including an upper template 2 and a lower template 7. The upper template 2 is movably mounted and connected to the power head of a punch press during operation. The lower template 7 is fixedly mounted and connected to the worktable of the punch press during operation. A forming punch 1 is fixedly mounted at the bottom of the upper template 2, and a forming die 6 is fixedly mounted at the top of the lower template 7. A pressure plate 4 and punch rods 3 are arranged around the periphery of the forming punch 1. There are six punch rods 3, and the top of the punch rods 3 is lower than the top of the forming punch 1. The pressure plate 4 is elastically connected to the upper template 2, and the punch rods 3 are fixedly connected to the upper template 2. The pressure plate 4 has through holes to allow the punch rods 3 to pass freely. In the natural state, neither the top of the punch rods 3 nor the top of the forming punch 1 protrudes from the lower end face of the pressure plate 4. Figure 3 As shown), the forming die 6 has a positioning hole 5 corresponding to the position of the punch 3. The upper end face edge of the forming die 6 is provided with a stop 11 for positioning the outer circle of the workpiece. The height of the stop 11 is less than the thickness of the workpiece. The bottom of the forming cavity of the forming die 6 is provided with a stripper 9. The stripper 9 is installed on the movable plate 8. The movable plate 8 and the upper template 2 move up and down synchronously. The movable plate 8 and the upper template 2 are detachably connected through the side plate 10. The upper end of the side plate 10 is connected to the side of the upper template 2, and the lower end of the side plate 10 is connected to the side of the movable plate 8. During operation, when the upper template 2 moves down and the forming punch 1 contacts the workpiece, the pressure plate 4 presses the workpiece, and the punch 3 punches the mounting hole 23 on the workpiece and enters the positioning hole 5 to position the mounting hole 23.

[0019] The present invention works as follows: The workpiece before stretching is placed on the upper end face of the forming die 6. The outer circle 21 of the workpiece is accurately positioned by the retaining edge 11. Then, the punching machine is started, which drives the upper template 2 to move downward. First, the pressure plate 4 contacts the workpiece and presses it down. Then, the punch 3 punches the mounting hole 23 on the workpiece. The punch 3 enters the positioning hole 5 to position the workpiece. This serves two purposes: first, to assist the pressure plate 4 in pressing the workpiece so that the outer circle 21 of the workpiece does not shrink when the workpiece is stretched; and second, to ensure that the size, position, and shape of the mounting hole 23 punched on the workpiece are accurate when the workpiece is stretched. Then, the forming punch 1 contacts the workpiece again until the upper and lower molds are closed. The workpiece is stretched and formed in conjunction with the forming die 6. After the workpiece stretching and forming part 22 is formed, the upper template 2 returns upward. The forming punch 1 leaves the forming die 6, the punch 3 leaves the positioning hole 5, and the pressure plate 4 finally disengages from the workpiece. At this time, the workpiece remains in the forming cavity of the forming die 6 and is ejected by the ejector rod 9.

Claims

1. A stamping die, comprising an upper die and a lower die, wherein the upper die is movably mounted, the lower die is fixedly mounted, a forming punch is fixedly mounted at the bottom of the upper die, and a forming die is fixedly mounted at the top of the lower die, characterized in that: The forming punch is surrounded by a pressure plate and punches, with at least six punches. The top of the punches is lower than the top of the forming punch. The pressure plate is elastically connected to the upper template, and the punches are fixedly connected to the upper template. The pressure plate has through holes to allow the punches to pass freely. In its natural state, neither the top of the punches nor the top of the forming punch protrudes from the lower end face of the pressure plate. The forming die has positioning holes corresponding to the positions of the punches. During operation, when the upper template moves down and before the forming punch contacts the workpiece, the pressure plate presses the workpiece, and the punches punch mounting holes in the workpiece and enter the positioning holes to position the mounting holes.

2. The stamping die as described in claim 1, characterized in that: The upper edge of the forming die is provided with a stop for positioning the outer circle of the workpiece, and the height of the stop is less than the thickness of the workpiece.

3. The stamping die as described in claim 1, characterized in that: The bottom of the forming cavity of the forming die is equipped with a stripper rod, which is installed on a movable plate. The movable plate and the upper template move up and down synchronously.

4. A stamping die as described in claim 3, characterized in that: The movable panel and the upper template are detachably connected via side panels. The upper end of the side panel is connected to the side of the upper template, and the lower end of the side panel is connected to the side of the movable panel.

Images