A trimming and piercing die for die castings

Abstract

The utility model provides a kind of deburring and punching hole inner burr mould for die casting, the punch pin of punching is designed on lower mould part, in this way, during placing casting, casting is placed on lower mould, the placement position of casting can be artificially accurately adjusted, ensure that the pre-casting hole of casting is aligned punch pin;And the punch pin of punching is designed as floating structure, can prevent jamming and punch deformation.

Description

Technical Field

[0001] This utility model belongs to the field of machining, specifically a die for trimming and punching holes to remove burrs from die-cast parts. Background Technology

[0002] The general process route for casting production is: die casting → trimming (removing the gating system, slag pockets and venting channels) and deburring the holes → shot blasting → machining, etc.

[0003] For some castings, the holes are pre-cast (die-cast), directly meeting the drawing tolerances and requiring no further machining. Therefore, during the trimming process (removing the gating system, slag pockets, and venting channels), the holes need to be punched to remove internal burrs. For example, ... Figure 1 As shown, the casting has four holes 01, and there are multiple gating channels, slag pockets and venting channels on the casting.

[0004] In existing technologies, punches used for punching are generally designed on the upper die (i.e., the moving die) of the mold. When punching holes to remove burrs from castings, the position of the casting fluctuates due to shrinkage or positioning issues, resulting in inaccurate, inconsistent, or different positions. This causes the punch to fail to accurately enter the pre-cast hole in the casting during the downward punching process of the upper die, thus damaging the product and posing a risk of punch breakage. Furthermore, the trimming die lacks a stripping device, and after punching, the casting is easily stuck on the punch, making it inconvenient to remove. Forcibly removing the casting may cause deformation. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a die for trimming, punching and deburring the inner hole of die-cast parts.

[0006] The technical problem solved by this utility model is achieved through the following technical solution:

[0007] A die for trimming, punching, and deburring die for die castings, comprising an upper die portion and a lower die portion;

[0008] The upper die part includes: an upper die base, a floating plate, a pressure post, a pressure block, and a punching punch. The punching punch is fixedly mounted on the upper die base by a fixed seat. The floating plate is mounted on the upper die base by a vertical guide post. The floating plate is located between the upper die base and the punching punch, and a spring is provided between the floating plate and the upper die base. The pressure post and the pressure block are connected to the bottom of the floating plate.

[0009] The lower mold portion includes: a lower mold base, a lower template, an elastic anti-roll bar, and a punch. The lower template is fixedly installed on the lower mold base, and the elastic anti-roll bar is installed on the lower template for unloading material during the mold parting process. The punch includes a top punch and a lower floating column. The top punch is used to punch into the hole of the casting. The floating column is vertically slidably embedded in a mounting plate on the lower mold base, and a return spring is provided at the bottom of the floating column to provide upward elastic force. The bottom of the floating column is provided with a bottom dead center position.

[0010] In the above technical solution, a limit post is set on the floating plate to limit the extreme position of the floating plate's upward floating.

[0011] In the above technical solution, a cavity is provided in the middle of the punching punch, the shape of which is adapted to the shape of the casting to be punched, and the pressure column and pressure block are located in the cavity.

[0012] In the above technical solution, the blanking punch includes multiple blanking stations, so that two castings can be blanked at the same time in one mold closing.

[0013] In the above technical solution, each blanking station of the blanking punch includes multiple pressure blocks and multiple pressure columns.

[0014] In the above technical solution, the pressure block is made of rubber.

[0015] In the above technical solution, a positioning block is provided on the lower template to position the casting on the lower template.

[0016] In the above technical solution, there are multiple elastic anti-pushers, which are used for unloading during the mold parting process (that is, pushing the cut casting upwards out of the lower mold).

[0017] In the above technical solution, the end of the pressure column is cylindrical and is used to press against the periphery of the pre-cast hole of the casting.

[0018] In the above technical solution, vertical protruding ridges are provided on the side wall of the floating column to prevent the floating column from rotating.

[0019] The advantages and beneficial effects of this utility model are as follows:

[0020] This invention designs the punch for punching holes on the lower die. In this way, during the placement of the casting, the casting is placed on the lower die, and the placement position of the casting can be precisely adjusted by the user to ensure that the pre-cast hole of the casting is aligned with the punch. (If the punch is located on the upper die, the position of the casting will fluctuate due to shrinkage or positioning, resulting in inaccurate, inconsistent, or different positions. As the upper die moves downward, the punch is likely to cut the edge of the hole, causing uneven force, distortion or breakage, and deformation of the casting.)

[0021] This invention designs the punching pin as a floating structure, which can prevent jamming and punching damage (if the punching pin is designed in the lower die and is not designed to float, the casting will be jammed by the punching pin due to the uneven pressure of the casting during the punching process, causing the casting to deform).

[0022] This invention incorporates a spring-loaded floating plate in the upper mold and an elastic anti-roll plate in the lower mold, enabling flexible material pressing and unloading (flexible material pressing during mold closing and unloading during mold opening), preventing jamming and improving efficiency. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the casting.

[0024] Figure 2 This is the front view of the mold of this utility model.

[0025] Figure 3 This is a structural schematic diagram of the upper mold part of this utility model.

[0026] Figure 4 This is a schematic diagram of the lower mold part of this utility model.

[0027] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0028] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not limiting, and should not be used to limit the protection scope of the present invention.

[0029] This utility model designs a die for trimming and punching holes to remove internal burrs from die-cast parts, see attached document. Figure 2 -Appendix Figure 4 The mold consists of an upper mold part and a lower mold part.

[0030] The upper die portion includes: an upper die base 11, a floating plate 12, a pressure post 13, a pressure block 14, and a punching punch 15; wherein, the punching punch 15 is fixedly mounted on the upper die base 11 via a fixed seat 16, the floating plate 12 is mounted on the upper die base 11 via a vertical guide post 17, the floating plate 12 is located between the upper die base 11 and the punching punch 15, and a spring 18 is provided between the floating plate 12 and the upper die base 11, the spring 18 provides a downward elastic force to the floating plate 12, the floating plate 12 can float up and down between the upper die base 11 and the punching punch 15; furthermore, a limit post 121 is provided on the floating plate 12 to limit the upper floating plate 12 to the extreme position (i.e., the top dead point); the pressure post 13 and the pressure block 14 are connected to the bottom of the floating plate 12. Furthermore, the punching punch 15 has a cavity in the middle, the shape of which is adapted to the shape of the casting to be punched. The pressure column 13 and the pressure block 14 are located in this cavity. Since the pressure column 13 and the pressure block 14 are connected to the floating plate 12, they can float up and down in the cavity, thereby realizing the pressing and unloading of the material (pressing during mold closing and unloading during mold opening).

[0031] For further details, please refer to the appendix. Figure 3 The blanking punch 15 may include multiple blanking stations. In this embodiment, it includes two blanking stations, allowing two castings to be blanked simultaneously in one mold closing operation. Each blanking station of the blanking punch 15 includes two pressure blocks 14 and four pressure posts 13. The two pressure blocks 14 are arranged side by side, which can better clamp the casting to be blanked in sections. The four pressure posts 13 correspond to the four hole positions of the casting. Furthermore, the pressure blocks 14 are made of rubber.

[0032] The lower mold portion includes: a lower mold base 21, a lower mold plate 22, elastic ejectors 23, and punches 24. The lower mold plate 22 is fixedly mounted on the lower mold base 21, and its shape is adapted to the shape of the casting to be punched. Preferably, a positioning block 221 is provided on the lower mold plate 22 to position the casting on the lower mold plate 22. Multiple elastic ejectors 23 are provided on the lower mold plate 22 for unloading during the mold parting process (i.e., pushing the cut casting upwards out of the lower mold plate 22). The number of punches 24 is consistent with the number of holes on the casting to be punched and deburred. In this design, there are four punches 24 distributed around the lower mold plate 22. More specifically, each punch 24 includes a top punch and a lower floating column 241. The top punch is used to punch into the hole of the casting to remove burrs from the hole. The floating column 241 is vertically slidably embedded in the mounting plate 211 on the lower mold base 21, and a return spring is provided at the bottom of the floating column 241 to provide upward elastic force to achieve the floating effect. The bottom of the floating column 241 is provided with a bottom dead center position. In addition, it should be noted that the side wall of the floating column 241 is provided with a protruding ridge 2411 to prevent the floating column 241 from rotating.

[0033] Furthermore, a vertical guide post and guide sleeve structure 3 is provided between the upper mold part and the lower mold part. This is a conventional existing technology in the mold field and will not be described in detail here.

[0034] The following describes in detail the working process of the die-casting part trimming and punching deburring mold of this utility model:

[0035] Step 1: Place the casting on the lower template 22 of the lower mold section. The casting is supported by the elastic anti-rollback 23. The positioning block 221 plays a coarse positioning role. The multiple pre-cast holes of the casting are suspended on the punch 24. During the placement of the casting, the placement position of the casting can be precisely adjusted by hand to ensure that the pre-cast holes of the casting are aligned with the punch 24.

[0036] Step 2: The upper mold moves downward (i.e., the mold closes), and the pressure column 13 and pressure block 14 first contact the top surface of the casting; then, as the upper mold continues to descend, the spring 18 is compressed, and the pressure column 13 and pressure block 14 begin to hold the casting. As the upper mold continues to descend, the pressure of the spring 18 increases, and the pressure column 13 and pressure block 14 press the casting firmly and fix it to the lower mold plate 22.

[0037] During this process, the elastic counter-pressure 23 is compressed by force, and the pressure column 13 presses against the pre-cast hole of the casting (the end of the pressure column 13 is cylindrical and used to press against the pre-cast hole of the casting), pressing the casting onto the punch 24, and the floating column 241 of the punch 24 is pressed down to the bottom dead center position, and the punch 24 is inserted into the pre-cast hole of the casting to complete the deburring of the hole.

[0038] During this process, the pressure column 13 and the pressure block 14 work together to float and align the casting, making it fit against the lower template 22.

[0039] Step 3: The upper die continues to descend. At this time, the pressure column 13 and the pressure block 14 completely fix the casting. The blanking punch 15 continues to descend, so that the blanking punch 15 performs edge trimming on the casting (a shearing action is formed between the inner edge of the blanking punch and the outer edge of the lower die), removing the sprue, slag port, and burrs around the casting.

[0040] Step 4: The upper die moves upward, the punching punch 15 leaves the casting, and the pressure column 13 and pressure block 14 leave the casting and return to their original positions, achieving separation between the casting and the punching punch 15 (i.e., unloading between the casting and the upper die). The elastic counter-ejector 23 pushes the casting out of the lower die (i.e., unloading between the casting and the lower die). Then, the casting with trimmed edges and punched holes to remove burrs can be easily removed.

[0041] The above description of the technical solution of this utility model is exemplary. It should be noted that, without departing from the core of this technical solution, any simple modifications, alterations, or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of this patent.

Claims

1. A die for trimming, punching, and deburring internal holes of die-cast parts, characterized in that: Includes the upper mold part and the lower mold part; The upper die part includes: an upper die base, a floating plate, a pressure post, a pressure block, and a punching punch. The punching punch is fixedly mounted on the upper die base by a fixed seat. The floating plate is mounted on the upper die base by a vertical guide post. The floating plate is located between the upper die base and the punching punch, and a spring is provided between the floating plate and the upper die base. The pressure post and the pressure block are connected to the bottom of the floating plate. The lower mold portion includes: a lower mold base, a lower template, an elastic anti-roll bar, and a punch. The lower template is fixedly installed on the lower mold base, and the elastic anti-roll bar is installed on the lower template for unloading material during the mold parting process. The punch includes a top punch and a lower floating column. The top punch is used to punch into the hole of the casting. The floating column is vertically slidably embedded in a mounting plate on the lower mold base, and a return spring is provided at the bottom of the floating column to provide upward elastic force. The bottom of the floating column is provided with a bottom dead center position.

2. The die for trimming and punching internal burrs removal of die-cast parts according to claim 1, characterized in that: Limit posts are installed on the floating plate to limit the extreme position of the floating plate's upward floating.

3. The die for trimming, punching, and deburring internal holes of die-cast parts according to claim 1, characterized in that: The punch has a cavity in the middle, the shape of which is adapted to the shape of the casting to be punched, and the pressure column and pressure block are located in the cavity.

4. The die for trimming, punching, and deburring internal holes of die-cast parts according to claim 1, characterized in that: The punching punch includes multiple punching stations.

5. The die for trimming, punching, and deburring inner holes of die-cast parts according to claim 4, characterized in that: Each blanking station of the blanking punch includes multiple blanking blocks and multiple blanking columns.

6. The die for trimming, punching, and deburring internal holes of die-cast parts according to claim 1, characterized in that: The pressure block is made of rubber.

7. The die for trimming and punching internal burrs removal of die-cast parts according to claim 1, characterized in that: A positioning block is provided on the lower template to position the casting on the lower template.

8. The die for trimming, punching, and deburring internal holes of die-cast parts according to claim 1, characterized in that: The number of elastic anti-rollers is multiple, used for unloading during the mold parting process.

9. The die for trimming and punching internal burrs removal of die-cast parts according to claim 1, characterized in that: The end of the pressure column is cylindrical and is used to hold the pre-cast hole around the casting.

10. The die for trimming, punching, and deburring inner holes of die-cast parts according to claim 1, characterized in that: The floating column has vertical protrusions on its sidewalls.

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