Zinc alloy balance block machining device and method
By using cold stamping to process zinc alloy balance blocks in the solid state, the problem of material brittle fracture caused by high temperature in the die casting process was solved, the product qualification rate and the toughness of the connecting ribs were improved, and efficient processing for continuous production was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI TOPSEAL AUTO-PARTS CO LTD
- Filing Date
- 2025-12-29
- Publication Date
- 2026-05-01
AI Technical Summary
In the die-casting process, zinc alloy balance blocks undergo changes in their microstructure due to high-temperature melting, making the connecting ribs prone to brittle fracture, resulting in a high scrap rate and a low pass rate.
The cold stamping process is adopted. Through the zinc alloy balance block processing device, the upper die base and multiple sets of punches are driven by the press to stamp the zinc alloy coil in the solid state, forming the connecting rib groove and marking. Then, it is bent and cut in the lower die to avoid the material performance degradation caused by high temperature melting.
It improves the toughness and strength of the connecting ribs of zinc alloy coils, reduces the scrap rate, ensures the pass rate of bending tests, and avoids material performance degradation and thermal stress problems caused by high-temperature die casting.
Smart Images
Figure CN121945633A_ABST
Abstract
Description
A zinc alloy balance block processing device and method Technical Field
[0001] This invention relates to the field of zinc alloy balance block processing technology, and in particular to a zinc alloy balance block processing apparatus and method. Background Technology
[0002] In the process of dynamic balancing of automobile tires, zinc alloy balance blocks are widely used as counterweight materials. Zinc alloy itself has good rust resistance, which gives it a certain advantage in the application of automobile tire counterweights. In addition, zinc alloy can be bent into arcs according to the size of different wheel rims, so it can fit tightly to the surface of the wheel rim. Therefore, zinc alloy is commonly used when manufacturing counterweights for vehicles. At the same time, this characteristic of zinc alloy also makes it suitable for processing counterweights with complex shapes.
[0003] Currently, die casting is commonly used in the manufacturing of zinc alloy balance blocks. Die casting involves heating the zinc alloy material to a high temperature to melt it, and then rapidly injecting the molten zinc alloy into a mold cavity under high pressure. After cooling and solidification, it is formed. However, this die casting process can easily cause changes in the metallographic structure of the zinc alloy material after high-temperature melting and die casting. During subsequent bending tests, the connecting ribs of the product are prone to brittle fracture, resulting in a high scrap rate and a low pass rate for bending tests of the connecting ribs after high-temperature die casting.
[0004] To address the aforementioned problems, this application proposes a zinc alloy balance block processing device and method. Summary of the Invention
[0005] This invention proposes a zinc alloy balance block processing device and method, which solves the problems in the related technology of zinc alloy balance block die casting process, where the metallographic structure of the material changes due to high temperature, the connecting ribs are prone to brittle fracture during bending tests, resulting in high scrap rate and low pass rate.
[0006] The present invention proposes a zinc alloy balance block processing device, including a feeding machine, a worktable, a lower mold and an upper mold;
[0007] The unloading machine and the worktable are arranged horizontally in sequence, and the unloading machine is used to load and unwind the zinc alloy coil.
[0008] A press is mounted on the workbench, the lower mold is mounted on the workbench, and the upper mold is mounted on the drive end of the press and located above the lower mold.
[0009] The upper mold includes an upper mold base and punch typesetting parts. The upper mold base is connected to the drive end of the press and is driven by it to move up and down. Multiple sets of punch typesetting parts are installed at intervals on the bottom of the upper mold base.
[0010] When the zinc alloy coil is pulled out and placed on the lower die, the press drives the upper die seat to move down and punch the zinc alloy coil through multiple sets of punches, forming multiple connecting rib grooves on its surface and marking it.
[0011] As a further optimization of the present invention, the punch typesetting component includes a forming punch and a typesetting die, wherein the forming punch and the typesetting die are installed side by side at the bottom of the upper die holder, and the bottom end of the forming punch extends beyond the bottom end of the typesetting die.
[0012] As a further optimization of the present invention, a bending punch and a cutting punch are also installed at the bottom of the upper die holder, and the bottom of the bending punch has an arc-shaped protrusion structure.
[0013] As a further optimization of the present invention, the bottom of the upper die holder is equipped with an elastic stripper sleeved on the forming punch, the typing punch, the bending punch and the cutting punch.
[0014] As a further optimization of the present invention, the elastic stripper includes a spring top and a stripper plate, and the bottom of the upper die base is equipped with a stripper plate that is slidably sleeved on the forming punch, the typing punch, the bending punch and the cutting punch.
[0015] As a further optimization of the present invention, the lower mold includes a lower mold base, which is mounted on a worktable. A bending die and a cutting insert are sequentially mounted on the lower mold base. The bending die is located below the bending punch, and the cutting insert is located below the cutting punch. An arc-shaped groove is integrally formed inside the bending die, and a discharge slope is integrally formed on one side of the lower mold base.
[0016] As a further optimization of the present invention, a guide for conveying zinc alloy coils is installed on the side of the workbench near the unloading machine.
[0017] As a further optimization of the present invention, the conveying component includes a conveyor and guide rollers. The conveyor is installed on the side of the workbench near the unloading machine. Two sets of guide rollers are installed on the conveyor and distributed vertically. The zinc alloy coil is used for conveying between the two sets of guide rollers.
[0018] As a further optimization of the present invention, the feeding machine is equipped with a plurality of conveying rollers arranged in an arc shape, and the plurality of conveying rollers have a bearing area for placing zinc alloy coils.
[0019] A method for processing zinc alloy balance blocks, using the aforementioned zinc alloy balance block processing apparatus, includes the following steps:
[0020] Step 1: Load the zinc alloy coil onto the feeding machine, then pull out the zinc alloy coil and convey it to the surface of the lower mold through the guide.
[0021] Step 2: The press drives the upper die base to move down the multiple sets of punches at its bottom. The elastic stripper follows and presses against the surface of the zinc alloy coil. The multiple sets of punches pass through the elastic stripper and are punched by the forming punches in the punches, forming multiple spaced connecting rib grooves on the surface. The punching punch marks the zinc alloy surface. After the punching and marking are completed, the press drives the upper die base to move the punches and the elastic stripper upward. The elastic stripper can prevent the zinc alloy coil from being lifted.
[0022] Step 3: The zinc alloy coil is conveyed to the position above the bending die in the lower mold. The press drives the upper mold base to move down and the bending punch at its bottom punches the zinc alloy coil, so that the zinc alloy coil is formed in the arc groove of the bending die. After the forming is completed, the press drives the upper mold base to move up.
[0023] Step 4: Continue feeding the zinc alloy coil, moving the stamped curved coil and the unstamped straight coil between the cutting punch and the cutting insert. When the press drives the upper die seat to move down, the cutting punch at its bottom can cut the connection between the curved coil and the unstamped straight coil. At the same time, the bending punch continues to stamp the zinc alloy coil to form a curved coil, thus achieving continuous processing.
[0024] The above-described technical solution of the present invention has the following beneficial technical effects:
[0025] 1. The zinc alloy coil is loaded onto the feeding machine, then pulled out and conveyed to the surface of the lower die via the guide. The press drives the upper die base, which in turn moves down multiple sets of punches at its bottom. The elastic stripper follows and presses against the surface of the zinc alloy coil. The multiple sets of punches pass through the elastic stripper, and the forming punches in the punches press the zinc alloy coil, forming multiple spaced connecting rib grooves on its surface. The marking punch marks the zinc alloy surface. After the stamping and marking are completed, the press... The upper die holder drives the punch and the elastic stripper to move upward. The elastic stripper can limit the zinc alloy coil from being lifted. The above design replaces the high-temperature die casting process with a stamping process, so that the zinc alloy material is always processed in a solid state. This fundamentally avoids the problems of metallographic structure changes and grain coarsening caused by high-temperature melting and recrystallization. It improves the toughness and strength of the connecting ribs of the zinc alloy coil, thereby effectively solving the problem of easy brittle fracture at the connecting ribs, improving the pass rate of bending test and reducing the scrap rate.
[0026] 2. The zinc alloy coil is conveyed to the position above the bending die in the lower mold. The press drives the upper die to move down, and the bending punch at its bottom punches the zinc alloy coil, forming it in the arc-shaped groove of the bending die. After forming, the press drives the upper die to move up, continuing to convey the zinc alloy coil. This moves the punched arc-shaped coil and the unpunched straight section of the coil between the cutting punch and the cutting insert. When the press drives the upper die to move down, the cutting punch at its bottom cuts the connection between the arc-shaped coil and the unpunched straight section of the coil. This design, based on the forming of the connecting rib by stamping, further completes the bending and length cutting of the product, avoiding material performance degradation and thermal stress problems caused by high temperature. This results in the final formed balance block connecting rib having good ductility and resistance to brittle fracture, further ensuring the overall bending test pass rate of the product. Attached Figure Description
[0027] Figure 1 is a schematic diagram of the overall structure of a zinc alloy balance block processing device proposed in this invention;
[0028] Figure 2 is a schematic diagram of the structure of the guide component of the present invention;
[0029] Figure 3 is a schematic diagram of the mating structure of the lower mold and the upper mold of the present invention;
[0030] Figure 4 is a schematic diagram of the structure of the mold of the present invention;
[0031] Figure 5 is a schematic diagram of the structure of the lower mold of the present invention.
[0032] Reference numerals: 1. Feeding machine; 101. Conveying roller; 2. Worktable; 21. Press; 3. Guide component; 31. Guide machine; 32. Guide roller; 4. Lower die; 41. Lower die base; 42. Bending die; 43. Cutting insert; 44. Discharge slope; 5. Upper die; 51. Upper die base; 52. Punch lettering component; 521. Forming punch; 522. Lettering punch; 53. Bending punch; 54. Cutting punch; 55. Elastic stripper; 551. Spring ejector; 552. Stripper plate. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.
[0034] Example 1
[0035] As shown in Figures 1-5, the zinc alloy balance block processing device proposed in this invention includes a feeding machine 1, a worktable 2, a lower mold 4 and an upper mold 5.
[0036] The feeding machine 1 and the worktable 2 are arranged horizontally in sequence, and the feeding machine 1 is used to load and unwind the zinc alloy coil.
[0037] A press 21 is installed on the workbench 2, a lower mold 4 is installed on the workbench 2, and an upper mold 5 is installed on the drive end of the press 21 and located above the lower mold 4.
[0038] The upper mold 5 includes an upper mold base 51 and a punch type 52. The upper mold base 51 is connected to the drive end of the press 21 and is driven by it to move up and down. Multiple sets of punch type 52 are installed at intervals on the bottom of the upper mold base 51.
[0039] When the zinc alloy coil is pulled out and placed on the lower die 4, the press 21 drives the upper die base 51 to move down and punch the zinc alloy coil through multiple sets of punches 52, forming multiple connecting rib grooves on its surface and marking it.
[0040] It should be noted that: the zinc alloy coil is loaded onto the unwinding machine 1, and the unwinding machine 1 unwinds the zinc alloy coil. After the zinc alloy coil is conveyed to the surface of the lower mold 4, the press 21 drives the upper mold base 51 to move down. Multiple sets of spaced punches 52 act synchronously on the surface of the coil, forming multiple connecting rib grooves on the surface of the coil at one time and completing the marking. This achieves simultaneous stamping and marking. This design replaces the traditional die casting with a cold stamping process, avoiding the damage of the material's metallographic structure caused by high temperature, thereby improving the toughness and anti-brittle fracture performance of the connecting ribs and increasing the product bending test pass rate.
[0041] In this embodiment, the punch typesetting component 52 includes a forming punch 521 and a typing punch 522. The forming punch 521 and the typing punch 522 are installed side by side at the bottom of the upper die base 51, and the bottom end of the forming punch 521 extends out of the bottom end of the typing punch 522.
[0042] It should be noted that the punch marking part 52 is composed of a forming punch 521 and a marking punch 522 arranged side by side. The two work together to achieve simultaneous forming and marking.
[0043] When the press 21 drives the upper die base 51 to move down, the forming punch 521 and the typing punch 522 move down synchronously. The forming punch 521 is used to press the connecting rib groove on the surface of the zinc alloy coil, and the typing punch 522 stamps the marking information on its surface.
[0044] It should be further explained that the forming punch 521 is slightly longer than the marking punch 522 to ensure that the rib groove is formed before marking is performed during the stamping process.
[0045] In this embodiment, a bending punch 53 and a cutting punch 54 are also installed at the bottom of the upper die holder 51. The bottom of the bending punch 53 has an arc-shaped protrusion structure.
[0046] It should be noted that the bending punch 53 and the cutting punch 54 are integrated at the bottom of the upper die holder 51. When the press 21 drives the upper die holder 51 to move down, they are respectively responsible for bending the stamped coil into an arc shape and cutting it to a fixed length.
[0047] To further explain: the cutting punch 54 separates the product after bending, realizing segmented output in continuous production.
[0048] In this embodiment, an elastic stripper 55 is installed at the bottom of the upper die base 51 and sleeved on the forming punch 521, the typing punch 522, the bending punch 53 and the cutting punch 54. The elastic stripper 55 includes a spring top 551 and a stripper plate 552. The stripper plate 552, which is slidably sleeved on the forming punch 521, the typing punch 522, the bending punch 53 and the cutting punch 54, is installed at the bottom of the upper die base 51 through the spring top 551.
[0049] During the stamping process, when the press 21 drives the upper die holder 51 to move downward, the stripper plate 552 first contacts and presses against the coil material, and the spring 551 is compressed. Then, the forming punch 521, the marking punch 522, and the bending punch 53 pass through the stripper plate 552 to complete stamping, marking, bending and other processing. After the stamping is completed, the press 21 drives the upper die holder 51 to move upward, and the spring 551 elastically resets, pushing the stripper plate 552 to maintain pressure on the coil material until the coil material is completely separated from the forming punch 521, the marking punch 522, and the bending punch 53. This structural design makes the stripping force evenly distributed and avoids coil material jamming caused by insufficient stripping force in some areas.
[0050] In this embodiment, the lower mold 4 includes a lower mold base 41, which is mounted on the workbench 2. A bending die 42 and a cutting insert 43 are sequentially mounted on the lower mold base 41. The bending die 42 is located below the bending punch 53, and the cutting insert 43 is located below the cutting punch 54. An arc-shaped groove is integrally formed inside the bending die 42, and a discharge slope 44 is integrally formed on one side of the lower mold base 41.
[0051] When the press 21 drives the upper die base 51 to move down, the bending punch 53 moves down accordingly, causing the zinc alloy coil to undergo plastic deformation in the arc-shaped groove of the bending die 42, forming an arc-shaped structure that meets the requirements. When the cutting punch 54 moves down, the cutting insert 43 serves as a cooperating part of the cutting punch 54. Through the shearing action of the cutting punch 54 and the cutting insert 43, the processed arc-shaped coil and straight section coil are cut off. The discharge slope 44 on one side of the lower die base 41 is used to guide the finished product balance block to be discharged smoothly.
[0052] In this embodiment, a guide 3 for conveying zinc alloy coils is installed on the side of the workbench 2 near the unloading machine 1. The guide 3 includes a guide machine 31 and guide rollers 32. The guide machine 31 is installed on the side of the workbench 2 near the unloading machine 1. Two sets of guide rollers 32 are installed on the guide machine 31, which are distributed vertically. The zinc alloy coils are used to be conveyed between the two sets of guide rollers 32.
[0053] It should be noted that the conveyor 31 clamps the roll material with two sets of upper and lower guide rollers 32 to achieve uniform and stable conveying. The surface of the guide rollers 32 is usually covered with rubber, which increases friction and avoids scratching the surface of the roll material.
[0054] In this embodiment, the feeding machine 1 is equipped with a plurality of arc-shaped conveying rollers 101, and the plurality of conveying rollers 101 have a bearing area for placing zinc alloy coils.
[0055] The arc-shaped conveyor rollers 101 are adapted to the curling shape of the zinc alloy coil, which can fit the outer surface of the coil and distribute the weight of the coil. Multiple conveyor rollers 101 can rotate freely. When the coil is pulled by the guide 3, the conveyor rollers 101 rotate synchronously with the unwinding of the coil, which reduces the friction between the coil and the conveyor rollers 101, avoids scratches or damage to the surface of the coil caused by friction, and ensures the appearance quality of the product.
[0056] Example 2
[0057] Based on Example 1, a method for processing zinc alloy balance blocks is proposed. Through a step-by-step process of stamping, marking, bending, and cutting, all processing steps are completed in the solid state, avoiding the high-temperature melting and microstructure changes inherent in traditional die-casting processes. The details are as follows:
[0058] A method for processing zinc alloy balance blocks, using the aforementioned zinc alloy balance block processing apparatus, includes the following steps:
[0059] Step 1: Load the zinc alloy coil onto the feeding machine 1, and then pull out the zinc alloy coil and convey it to the surface of the lower mold 4 through the guide 3;
[0060] Step 2: Press 21 drives upper die base 51 to move multiple sets of punches 52 at its bottom downwards. Elastic stripper 55 moves downwards and presses against the surface of zinc alloy coil. Multiple sets of punches 52 pass through elastic stripper 55 and are punched by forming punches 521 in punches 52, forming multiple spaced connecting rib grooves on the surface. The punching punch 522 marks the zinc alloy surface. After the punching and marking are completed, press 21 drives upper die base 51 to move punches 52 and elastic stripper 55 upwards. Elastic stripper 55 can prevent the zinc alloy coil from being lifted.
[0061] Step 3: The zinc alloy coil is conveyed to the position above the bending die 42 in the lower die 4. The press 21 drives the upper die base 51 to move down and punches the zinc alloy coil through the bending punch 53 at its bottom, so that the zinc alloy coil is formed in the arc groove of the bending die 42. After the forming is completed, the press 21 drives the upper die base 51 to move up.
[0062] Step 4: Continue feeding the zinc alloy coil, moving the stamped curved coil and the unstamped straight coil between the cutting punch 54 and the cutting insert 43. When the press 21 drives the upper die base 51 to move down, the cutting punch 54 at its bottom can cut the connection between the curved coil and the unstamped straight coil. At the same time, the bending punch 53 continues to stamp the zinc alloy coil to form a curved coil, thus achieving continuous processing.
[0063] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.
Claims
1. A zinc alloy balance block processing device, characterized in that, The system includes a feeding machine (1), a workbench (2), a lower mold (4), and an upper mold (5); the feeding machine (1) and the workbench (2) are arranged horizontally in sequence, and the feeding machine (1) is used to load and unwind zinc alloy coils; a press (21) is installed on the workbench (2), the lower mold (4) is installed on the workbench (2), and the upper mold (5) is installed on the drive end of the press (21) and located above the lower mold (4); the upper mold (5) includes an upper mold base ( 51) With punch marking parts (52), the upper die base (51) is connected to the drive end of the press (21) and driven by it to move up and down. Multiple sets of punch marking parts (52) are installed at the bottom of the upper die base (51). When the zinc alloy coil is pulled out and placed on the lower die (4), the press (21) drives the upper die base (51) to move down and punch the zinc alloy coil through multiple sets of punch marking parts (52) to form multiple connecting rib grooves on its surface and mark it.
2. The zinc alloy balance block processing device according to claim 1, characterized in that, The punch typesetting component (52) includes a forming punch (521) and a typing punch (522). The forming punch (521) and the typing punch (522) are installed side by side at the bottom of the upper die holder (51), and the bottom end of the forming punch (521) extends out of the bottom end of the typing punch (522).
3. The zinc alloy balance block processing device according to claim 2, characterized in that, The bottom of the upper die holder (51) is also equipped with a bending punch (53) and a cutting punch (54), and the bottom of the bending punch (53) has an arc-shaped protrusion structure.
4. The zinc alloy balance block processing device according to claim 3, characterized in that, The bottom of the upper die holder (51) is equipped with an elastic stripper (55) that is sleeved on the forming punch (521), the typing punch (522), the bending punch (53) and the cutting punch (54).
5. The zinc alloy balance block processing device according to claim 4, characterized in that, The elastic stripper (55) includes a spring top (551) and a stripper plate (552). The bottom of the upper die base (51) is equipped with a stripper plate (552) that is slidably sleeved on the forming punch (521), the typing punch (522), the bending punch (53) and the cutting punch (54) through the spring top (551).
6. The zinc alloy balance block processing device according to claim 5, characterized in that, The lower mold (4) includes a lower mold base (41), which is mounted on the workbench (2). A bending die (42) and a cutting insert (43) are sequentially mounted on the lower mold base (41). The bending die (42) is located below the bending punch (53), and the cutting insert (43) is located below the cutting punch (54). An arc-shaped groove is integrally formed inside the bending die (42), and a discharge slope (44) is integrally formed on one side of the lower mold base (41).
7. The zinc alloy balance block processing device according to claim 1, characterized in that, The workbench (2) is equipped with a guide (3) for conveying zinc alloy coils on the side near the feeder (1).
8. The zinc alloy balance block processing device according to claim 7, characterized in that, The guide (3) includes a guide machine (31) and guide rollers (32). The guide machine (31) is installed on the side of the workbench (2) near the feeder (1). Two sets of guide rollers (32) are installed on the guide machine (31) and distributed vertically. The zinc alloy coil is used to transport between the two sets of guide rollers (32).
9. A zinc alloy balance block processing device according to claim 1, characterized in that, The feeding machine (1) is equipped with a plurality of conveying rollers (101) arranged in an arc shape, and the plurality of conveying rollers (101) have a bearing area for placing zinc alloy coils.
10. A method for machining zinc alloy balance blocks, using a zinc alloy balance block machining apparatus as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Load the zinc alloy coil onto the feeding machine (1), then pull out the zinc alloy coil and convey it to the surface of the lower mold (4) through the guide (3); Step 2: The press (21) drives the upper mold base (51) to move down the multiple sets of punches (52) at its bottom. The elastic stripper (55) moves down and presses against the surface of the zinc alloy coil. The multiple sets of punches (52) pass through the elastic stripper (55) and are punched by the forming punch (521) in the punches (52) to form multiple spaced connecting rib grooves on its surface. The punching punch (522) marks the zinc alloy surface. After the punching and marking are completed, the press (21) drives the upper mold base (51) to move the punches (52) and the elastic stripper (55) up. The elastic stripper (55) can restrict the zinc alloy coil from being carried. Step 3: The zinc alloy coil is conveyed to the position above the bending die (42) in the lower die (4). The press (21) drives the upper die seat (51) to move down and the bending punch (53) at its bottom presses the zinc alloy coil, so that the zinc alloy coil is formed in the arc groove of the bending die (42). After the forming is completed, the press (21) drives the upper die seat (51) to move up. Step 4: The zinc alloy coil is continued to be conveyed, so that the punched arc-shaped coil and the unpunched straight section of the coil are moved between the cutting punch (54) and the cutting insert (43). When the press (21) drives the upper die seat (51) to move down, the cutting punch (54) at its bottom can cut the connection between the arc-shaped coil and the unpunched straight section of the coil. At the same time, the bending punch (53) continues to punch the zinc alloy coil to form an arc-shaped coil, so as to realize continuous processing.