Punching die for side wall of circular pipe

Abstract

The utility model belongs to the technical field of punching, and particularly relates to a punching die for the side wall of a round pipe. Comprising an upper die assembly, a lower die assembly and a forming punch, the upper die assembly comprises an upper die base, a slotting tool and a limiting column, and the lower die assembly comprises a lower die base, a stripping block, a lower die tool edge, a sliding block and a fixing plate; the slotting tool is installed on the upper die base, and the outer guide column is arranged below the upper die base. The fixing plate is installed on the lower die base, and the stripping block, the lower die knife edge and the sliding block base are installed on the fixing plate. The forming punch is installed on the sliding block base in a sliding mode. In practical application, through the upper die assembly, the lower die assembly and the forming punch, trepanning work of the side wall of the round pipe can be achieved by converting multiple procedures into one procedure, the process difficulty is lowered, the machining procedures are reduced, production efficiency is improved, and cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of stamping, and in particular relates to a round tube side wall punching die. Background Art

[0002] Salad holes are mainly used for riveting or countersunk screw connections between parts. The surface is flat and beautiful after connection. The existing technology requires at least two steps to process salad holes on the side walls of round tubes. When drilling salad holes on flat or curved parts, the positioning between multiple steps can be achieved by using the part shape or curved surface profiling to achieve precise positioning, which is easier to achieve. For salad holes on the side walls of round tube parts, positioning can be achieved by the inner diameter, outer diameter and end face of the round tube, but the radial rotation of the round tube cannot be fixed at this time, and precise positioning between multiple steps is more difficult.

[0003] A new type of round tube punching die with patent application number CN201811007442.3 includes a base, a cover plate and a stamping plate arranged in sequence from bottom to top; a positioning seat is provided on the base; a mounting groove is provided on the positioning seat; a pipe support is provided on both sides of the mounting groove; an arc-shaped pipe groove is provided on the upper part of the adjacent side of the two pipe supports, and a rubber pad is provided between the two pipe supports; the contact surface between the pipe support and the mounting groove is an inclined surface; an elastic pad is provided under the pipe support; two movable sliders are provided on the cover plate, and the two movable sliders are symmetrically arranged on both sides of the cover plate; a positioning groove with an arc structure is provided on the movable slider; a top block cooperating with the movable slider is provided on the stamping plate; and a punching needle is provided on the stamping plate.

[0004] The positioning effect of the above-mentioned device is poor when processing salad holes in round tubes, and processing the salad holes requires multiple steps and is cumbersome. Therefore, it is urgent for technical personnel in this field to solve the above-mentioned technical problems. Utility Model Content

[0005] The technical problem to be solved by the present invention is that in the prior art, the above-mentioned device has poor positioning effect when processing round tubes, and multiple processes are required to process salad holes.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A circular tube side wall punching die is used to punch salad holes on the side wall of a circular tube, comprising an upper die assembly, a lower die assembly and a forming punch, wherein the upper die assembly comprises an upper die base, a plunger and an outer guide column, and the lower die assembly comprises a lower die base, a lower die blade, a slider seat, a fixing plate, a connecting plate and a positioning block;

[0008] The insert is mounted on the upper die base, and the outer guide post is arranged below the upper die base;

[0009] The fixing plate is installed on the lower die base, and the lower die blade and the slider seat are installed on the fixing plate;

[0010] The forming punch is slidably mounted on the slider seat;

[0011] The lower die base is further provided with a receiving groove, a connecting plate and a leaning block, and the connecting plate and the leaning block are fixed in the receiving groove;

[0012] The connecting plate is further provided with a positioning block, and the positioning block is provided with a positioning groove for accommodating the round tube.

[0013] Furthermore, the fixed plate is fixed to the lower die base by screws, the lower die blade and the stripping block are fixed to the fixed plate by screws, and a stripping block is also installed on the fixed plate; the lower die blade passes through the stripping block, and a waste channel passing through the lower die blade and the fixed plate is provided on the lower die blade and the fixed plate; the forming punch passes through the stripping block and probes into the waste channel.

[0014] The design of the waste channel ensures that the waste generated during the stamping process can be discharged smoothly from the mold, avoiding processing interruptions or quality problems caused by waste blockage. The fixed plate is fixed to the lower mold base with screws, which means that replacing or adjusting the fixed plate is more convenient and quick, simplifying the maintenance of the mold. The lower mold blade and stripper block are fixed to the fixed plate with screws. This method provides a more stable fixing effect, reduces vibration during processing, helps to improve processing accuracy and extend mold life. The setting of the stripper block helps to easily remove waste from the round tube after stamping is completed, reduces manual intervention, and further improves production efficiency. This modular design allows users to replace different lower mold blades and stripper blocks as needed to adapt to different sizes of round tubes or different types of processing requirements. Components fixed with screws make it easier to inspect and replace damaged parts, reducing the risk of the entire mold being scrapped due to failure of a single component. By optimizing the mold design, the operation process is ensured to be safer and more reliable, reducing potential safety hazards.

[0015] Furthermore, a blocking member is provided in the waste channel, the blocking member is located in the middle of the forming punch, and the blocking member is vertically arranged in the middle of the waste channel.

[0016] The blocking member is vertically arranged in the middle of the waste channel, and its two sides are arranged in an outward-protruding arc, which can effectively block the waste splashing generated during the stamping process and ensure that the waste is discharged along the predetermined path instead of being scattered everywhere. The design of the blocking member helps to guide the waste smoothly through the waste channel, reducing the possibility of waste being stuck during the discharge process, ensuring the cleanliness and continuous working ability of the mold, and by preventing waste from splashing, the risk of operator injury can be reduced and operational safety can be improved. The smooth discharge of waste helps to reduce waste accumulation inside the mold and reduces the frequency and difficulty of mold maintenance.

[0017] Furthermore, the waste channel is divided into a horizontal section and an inclined section, the horizontal section is located in the stripping block, and the inclined section is located in the fixed plate; the connection between the inclined section and the horizontal section is a rounded shape, and the inclined section opens downward.

[0018] The horizontal section is located in the stripper block, and the inclined section is located in the fixed plate. This segmented design ensures that waste can be discharged smoothly from the mold, reducing the possibility of waste getting stuck. The downward-facing opening of the inclined section facilitates gravity-assisted waste discharge, reducing waste accumulation inside the mold and ensuring mold cleanliness and continuous operation. The rounded corners of the connection reduce the resistance of waste at corners, reducing the risk of waste getting stuck, and ensuring smooth waste discharge. Smooth waste discharge reduces the possibility of waste splashing, reduces the risk of operator injury, and improves operational safety. Smooth waste discharge helps reduce waste accumulation inside the mold and reduces the frequency and difficulty of mold maintenance.

[0019] Furthermore, the upper portion of the forming punch is funnel-shaped and the lower portion is cylindrical.

[0020] The funnel shape helps to better form the salad hole during the stamping process and ensure the forming quality of the salad hole. This design can reduce the uneven flow of material during the forming process, thereby obtaining a smoother and more precise hole edge. The funnel shape design helps to disperse the stress distribution of the material during the stamping process, reduce stress concentration, and thus reduce the risk of cracks at the hole edge.

[0021] Furthermore, the length of the lower portion of the forming punch is 1.2 times the thickness of the round tube to be processed, and the aperture of the lower die blade is 0.06 mm larger than the diameter of the lower portion of the forming punch.

[0022] The length of the lower section of the forming punch is 1.2 times the thickness of the round tube to be processed. This design ensures that the forming punch can completely penetrate the round tube during the stamping process to form a complete salad hole. By precisely controlling the length of the lower section of the forming punch, the depth of the salad hole can be effectively controlled, ensuring that the depth of all processed salad holes is consistent, thereby improving product quality consistency.

[0023] Furthermore, a spring is provided between the forming punch and the slider seat.

[0024] One of the functions of a spring is to help the forming punch automatically return to its initial position after completing a stamping action. This ensures the consistency and continuity of each stamping action and improves production efficiency. During the stamping process, the forming punch contacts the round tube, generating a large impact force. By providing a spring, some of the impact energy can be absorbed, reducing damage to the mold and mechanical equipment, and extending the service life of the mold and equipment. The spring can also reduce the noise generated when the forming punch collides with the slider seat, improving the working environment and reducing noise pollution. When the forming punch contacts the round tube, the spring can act as a buffer, reducing mold damage caused by sudden impact, especially when the round tube is not properly positioned or other unexpected situations exist. The presence of the spring helps to ensure that the forming punch is in a safe position when not subjected to external forces, reducing the risk of operator injury. During the forming punch's rebound process, the spring can help push waste material out of the mold. The spring can quickly reset the forming punch, reducing waiting time and thus improving the efficiency of the production line.

[0025] Furthermore, a limiting column is provided between the lower die base and the upper die base.

[0026] One of the functions of the limit column is to provide precise positioning when the mold is closed, ensuring that the gap between the upper mold base and the lower mold base reaches the predetermined value, which is very important for ensuring the dimensional accuracy of the salad hole. Setting the limit column can prevent the upper mold base from dropping excessively, thereby avoiding hard collisions between mold components and reducing the risk of wear and damage to the mold. The limit column ensures the stability and consistency of the mold in the closed state, reduces the probability of accidents, and improves operational safety. By limiting the descending distance of the upper mold base, the depth of each stamping action can be ensured to be consistent, which helps to improve the molding quality of the salad hole. The limit column reduces the direct impact between mold components, which helps to reduce maintenance times and costs. By ensuring the consistency of mold closure through the limit column, the time for mold adjustment can be reduced, thereby improving production efficiency.

[0027] The utility model has the following beneficial effects:

[0028] 1. This utility model designs a specially shaped forming punch. The length of the lower section is 1.2 times the thickness of the material to ensure the size of the salad bottom hole. The upper section is extruded to form the salad hole countersunk head. This allows the salad hole forming process, which originally required two or more steps, to be completed in one step, greatly simplifying the processing flow.

[0029] 2. This utility model uses a plunger in conjunction with a forming punch. When the upper die seat moves downward under the action of the punch press, the plunger drives the forming punch to punch and extrude the countersunk head of the steel pipe part. The spring installed between the forming punch and the slider seat can help the forming punch reset and also cushion the impact force of the plunger, ensuring a smooth stamping process, reducing the processing cycle time and improving production efficiency.

[0030] 3. The utility model fixes the positioning block to the connecting plate with screws to ensure the precise position of the steel pipe parts during the processing. The stripping block fits the outer circle of the steel pipe parts, which can effectively prevent the parts from deforming during the punching and extrusion process. The fixing plate is embedded in the lower die base and is provided with a waste channel for the smooth discharge of waste after punching. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The principle of making salad in one step;

[0032] Figure 2 It is a one-step salad making process;

[0033] Figure 3 A top view of a mold structure for beating salad on the side wall of a circular tube in one step;

[0034] Figure 4 A top view and AA cross-sectional view of a mold structure for making salad in one step on the side wall of a circular tube;

[0035] Figure 5 A top view and BB cross-sectional view of a mold structure for making salad on the side wall of a circular tube in one step;

[0036] Figure 6 This is a general structural diagram of a mold for making salad in one step on the side wall of a circular tube;

[0037] Figure 7 This is a cross-sectional view of the waste channel in the fourth embodiment of the present utility model;

[0038] Figure 8 It is a cross-sectional view of the horizontal section of the waste channel in the fourth embodiment of the present utility model.

[0039] Among them, 1-upper die base; 2-outer guide column; 3-lower die base; 4-support block; 5-slider seat; 6-spring; 7-forming punch; 8-stripping block; 9-steel pipe parts; 10-lower die blade; 11-insert knife; 12-waste channel; 121-blocking part; 122-horizontal section; 123-inclined section; 13-fixed plate; 14-limiting column; 15-positioning block; 16-connecting plate. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0041] In the description of the present invention, it should be understood that the terms "left side," "right side," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of a component and therefore should not be construed as limiting the present invention. The specific dimensions used in this embodiment are merely for illustrative purposes and do not limit the scope of protection of the present invention.

[0042] Example 1: Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 It can be seen that the circular tube side wall punching die is used to open salad holes on the side wall of the steel tube part 9. The existing circular tube side wall punching die needs to go through multiple processing steps when opening salad holes on the side wall of the steel tube part 9. The operation is cumbersome and increases the production cost. Therefore, in order to improve the efficiency of opening salad holes on the side wall of the steel tube part 9, a circular tube side wall punching die is proposed, which includes an upper die base 1, a limiting column 14 and a lower die base 3 connected in sequence from top to bottom. An outer guide column 2 is provided between the upper die base 1 and the lower die base 3. The upper die base 1 slides up and down along the outer guide column 2. The outer guide column 2 is fixed to the upper die base 1 by screws and dowel pins and provides guidance for the upper die base 1. The lower die blade 10 is fixed on the fixed plate 13. The fixed plate 13 is embedded in the lower die base 3. A positioning block 15 is also provided on the connecting plate 16. The positioning block 15 is fixed in the positioning groove of the connecting plate 16 by screws. The receiving groove of the positioning block 15 is mainly used for positioning the steel tube part 9. The lower die base 3 is also provided with a slider base 5, a support block 4, and a connecting plate 16. The forming punch 7 slides on the slider base 5 to achieve the positioning of the steel pipe part 9. The support block 4 is mainly used to balance the lateral force of the plunger 11 during the stamping process. The plunger 11 is connected to the lower side of the upper die base 1 and is fixed in the upper die base 1. It directly drives the forming punch 7 to punch into the lower die blade 10. After one-step processing, a salad hole is directly opened on the side wall of the steel pipe part 9, which greatly improves production efficiency.

[0043] Embodiment 2: The difference from embodiment 1 is that a waste channel 12 and a stripping block 8 are provided in embodiment 2. The stripping block 8 and the waste channel 12 solve the problem that the material cannot be separated after production is completed and the waste generated cannot be discharged. The stripping block 8 fits the outer circle of the steel pipe part 9 to ensure that the part is not deformed during the punching and extrusion process. The waste channel 12 passes through the lower die blade 10 and the fixed plate 13. The forming punch 7 passes through the stripping block 8 and probes into the waste channel 12. When opening the hole, the forming punch 7 pushes the waste generated by the steel pipe part 9 into the waste channel 12, and the waste channel 12 discharges the waste after punching; the stripping block 8 and the waste channel 12 can quickly separate the processed material from the waste, which speeds up the production rhythm and does not affect the subsequent processing.

[0044] During stamping: a spring 6 is provided between the forming punch 7 and the slider seat 5. The spring 6 can reset the forming punch 7 and buffer the impact force of the inserting knife 11. The upper die seat 1 of the mold moves vertically downward from the dead point of the punch through the outer guide column 2 under the action of the punch. When the inserting knife 11 contacts the forming punch 7, the inserting knife 11 drives the forming punch 7 to punch the steel pipe part 9 first, and then squeezes the countersunk head. At this time, the stripping block 8 can effectively ensure that the outer circle of the steel pipe part 9 is not deformed until the limiting column 14 contacts the lower die seat 3 and the punch moves to the bottom dead point. During this process, the spring 6 is compressed all the time, the punch moves upward, the upper die seat 1 and the inserting knife 11 move upward, and the spring 6 resets the forming punch 7 until the inserting knife 11 does not contact the forming punch 7. The reset of the forming punch 7 is completed; the upper die part continues to move upward until the punch reaches the top dead point, and the steel pipe part 9 is pulled out, and the salad is completed in one step.

[0045] Example 3: The waste in the waste channel 12 is prone to splashing during stamping. Figure 8 It can be seen that the difference between this embodiment and the second embodiment is that a blocking member 121 is provided in the middle of the waste channel 12. The waste generated by the punching of the forming punch 7 is blocked by the blocking member 121 and falls into the bottom of the waste channel 12 along the blocking member, so that the waste will not splash due to punching on both sides.

[0046] Example 4: In order to improve the discharge efficiency of waste in the waste channel 12, refer to Figure 7 It can be seen that the difference between this embodiment and embodiment one, embodiment two, and embodiment three is that the waste channel 12 is set as a horizontal section 122 and an inclined section 123, the horizontal section 122 is located in the stripping block 8, and the inclined section 123 is located in the fixed plate 13 with its opening facing downward. The connection between the inclined section 123 and the horizontal section 122 is provided with a rounded corner. After the waste is generated, it first passes through the horizontal section 122 of the waste channel 12. Since the horizontal section 122 and the connecting section are set to a rounded shape, the waste can be easily discharged into the inclined section 123. The waste is discharged from the waste channel 12 under the action of gravity in the inclined section 123.

[0047] Example 5: In order to solve the problem of burrs when the side wall of the steel pipe part 9 is opened, refer to Figure 1 and Figure 2 , it can be seen that by setting the upper part of the forming punch 7 to a funnel shape and the lower part to a cylindrical shape, the diameter of the lower part of the forming punch is 6 mm, the length is 1.2 times the thickness of the steel pipe part 9, and the aperture of the lower die blade 10 is 6.06 mm;

[0048] The stamping process is as follows: first, the lower part of the forming punch 7 punches the steel pipe part 9, and then the lower part of the forming punch 7 enters the lower die base 3 and extrude the steel pipe part 9 to form a countersunk head; the gap between the forming punch 7 and the lower die base 3 is only 0.03mm on one side, and the gap is small. During extrusion, the material will not enter the lower die base 3 to produce burrs. The lower part of the forming punch 7 ensures the lower size of the salad hole, and the upper part extrudes to ensure the upper size of the salad hole. During extrusion, the material diffuses to the surroundings, which solves the problem of burrs generated during stamping and affecting product quality.

[0049] Example 6: Compared with Example 1 and Example 2, the movement of the upper mold base 1 beyond the limit when pressing down will affect the mold. Therefore, a limit column 14 is provided under the upper mold base 1. The limit column 14 can limit the downward position of the upper mold base 1 to prevent safety accidents caused by overpressure. The purpose of repeated use of the device is achieved through the spring 6 and the limit column 14, thereby improving the service life of the device.

[0050] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A round tube side wall punching die, used for making salad holes on the side wall of a round tube, characterized in that: The invention comprises an upper die assembly, a lower die assembly and a forming punch (7), wherein the upper die assembly comprises an upper die base (1), a plunger (11) and an outer guide column (2), and the lower die assembly comprises a lower die base (3), a lower die blade (10), a slider seat (5), a fixing plate (13), a connecting plate (16) and a positioning block (15); The inserting knife (11) is mounted on the upper die base (1), and the outer guide column (2) is arranged below the upper die base (1); The fixing plate (13) is mounted on the lower die base (3), and the lower die blade (10) and the slider base (5) are mounted on the fixing plate (13); The forming punch (7) is slidably mounted on the slider seat (5); The lower die base (3) is further provided with a receiving groove, a connecting plate (16) and a leaning block (4), and the connecting plate (16) and the leaning block (4) are fixed in the receiving groove; A positioning block (15) is also provided on the connecting plate (16), and a positioning groove for accommodating a circular tube is provided on the positioning block (15).

2. The round tube side wall punching die according to claim 1, characterized in that: The fixed plate (13) is fixed to the lower die base (3) by screws, the lower die blade (10) and the stripper block (8) are fixed to the fixed plate (13) by screws, and the stripper block (8) is also installed on the fixed plate (13); the lower die blade (10) passes through the stripper block (8), and a waste channel (12) passing through the lower die blade (10) and the fixed plate (13) is provided on the lower die blade (10) and the fixed plate (13); the forming punch (7) passes through the stripper block (8) and probes into the waste channel (12).

3. The round tube side wall punching die according to claim 2, characterized in that: A blocking member (121) is provided in the waste channel (12), the blocking member (121) is located in the middle of the forming punch (7), and the blocking member (121) is vertically arranged in the middle of the waste channel (12).

4. The round tube side wall punching die according to claim 2, characterized in that: The waste channel (12) is divided into a horizontal section (122) and an inclined section (123), wherein the horizontal section (122) is located in the stripping block (8), and the inclined section (123) is located in the fixed plate (13); the connection between the inclined section (123) and the horizontal section (122) is in a rounded shape, and the inclined section (123) opens downward.

5. The round tube side wall punching die according to claim 1, characterized in that: The upper part of the forming punch (7) is funnel-shaped, and the lower part is cylindrical.

6. The round tube side wall punching die according to claim 3, characterized in that: The length of the lower portion of the forming punch (7) is 1.2 times the thickness of the round tube to be processed, and the aperture of the lower die blade (10) is 0.06 mm larger than the diameter of the lower portion of the forming punch (7).

7. The round tube side wall punching die according to claim 1, characterized in that: A spring (6) is provided between the forming punch (7) and the slider seat (5).

8. The round tube side wall punching die according to claim 1, characterized in that: A limiting column (14) is also provided between the lower die base (3) and the upper die base (1).

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