A mold for removing a surface coating from a part

Abstract

The utility model relates to a kind of moulds for removing part surface coating, including upper die and lower die, upper die includes upper die seat, upper die material block and upper die reset peg, upper die material block is fixed in the lower of upper die seat;Upper die reset peg is movably worn in upper die seat, lower end extends to the position close to lower die, and upper die reset peg is equipped with reset spring outside;Lower die includes lower die seat, floating block, rotary projection, lower die drive pin and movable block, floating block is set in the upper of lower die seat;Movable block is slidably set in lower die seat by guide structure, rotary projection is hinged with movable block by pivot, and the top of rotary projection is provided with skiving cutting edge;Lower die drive pin one end is fixed in the bottom of floating block, and the other end is obliquely abutted on the side wall of rotary projection;Movable block and lower die seat between being provided with movable block reset spring.The utility model can realize fast, stable removal part surface zinc plating coating and can improve working environment.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts processing technology, specifically relating to a mold for quickly removing zinc coating from the surface of parts. Background Technology

[0002] Car anti-collision hooks (their structure is as follows) Figure 1 The component shown (as shown) is a key part of the automotive collision avoidance system and is typically sourced through outsourcing. To prevent rust during transportation and storage, outsourced suppliers galvanize the surface of the collision avoidance hook parts. However, this galvanizing coating severely affects the arc welding quality between the collision avoidance hook and the collision avoidance beam, leading to problems such as weak welds and weld defects.

[0003] In existing technologies, companies typically remove galvanized coatings by manually grinding with hand-held grinders. This method has the following drawbacks: 1) Extremely low production efficiency, unable to meet the needs of mass production; 2) High production costs, requiring a large investment of manpower, and the grinding machine consumes consumables quickly; 3) Harsh working environment, generating a large amount of dust and noise during grinding, seriously endangering the health of operators; 4) Poor environmental performance, with fugitive dust emissions that do not meet environmental regulations; 5) Unstable coating removal quality, as the grinding force and range are difficult to control, easily resulting in coating residue or damage to the surface of parts.

[0004] Therefore, developing a high-efficiency, low-cost, environmentally friendly, and high-quality coating removal device for parts has become an urgent technical problem to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a mold for removing coatings from the surface of parts, so as to achieve rapid and stable removal of zinc coatings from the surface of parts, improve production efficiency, reduce production costs, improve the working environment and meet environmental protection requirements.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A mold for removing coating from the surface of a part includes an upper mold, a lower mold, and a reset mechanism. The upper mold includes an upper mold base, an upper mold pressure block, and an upper mold reset pin. The upper mold pressure block is fixed below the upper mold base and is adapted to the shape of the part. The upper mold reset pin is movably inserted into the upper mold base, with its lower end extending to a position close to the lower mold, and a reset spring is sleeved on the upper mold reset pin. The lower mold includes a lower mold base, a floating block, a rotating punch, a lower mold drive pin, and a movable block. The floating block is disposed above the lower mold base and corresponds vertically to the upper mold pressure block. The movable block is slidably disposed in the lower mold base through a guide structure. The rotating punch is hinged to the movable block through a rotating shaft. The top end of the rotating punch is provided with a scraping edge, which is in contact with the surface of the part where the coating needs to be removed. One end of the lower mold drive pin is fixed to the bottom of the floating block, and the other end is inclined against the side wall of the rotating punch, forming a wedge-shaped drive engagement. The reset mechanism includes a movable block reset spring, which is disposed between the movable block and the lower mold base.

[0007] Furthermore, the scraping edge is made of cemented carbide material, with an edge angle of 30°-45°, to ensure scraping efficiency and service life.

[0008] Furthermore, a floating guide post and a floating spring are provided between the floating block and the lower mold base to ensure that the floating block moves smoothly up and down.

[0009] Furthermore, a rolling bearing is provided at the lower end of the lower die drive pin, and the rolling bearing makes rolling contact with the side wall of the rotating punch to reduce friction during the driving process.

[0010] Furthermore, the number of rotating punches is matched with the number of parts of the part where the coating needs to be removed, so that the coating removal of multiple parts can be completed simultaneously.

[0011] Compared with the prior art, this utility model has the following advantages: Significantly improved production efficiency: The use of mechanized scraping with molds reduces the time required for a single operation to only 10-15 seconds, which is 12-30 times more efficient than manual polishing and can meet the needs of mass production. Production costs are significantly reduced: no manual hand-grinding is required, a single mold set can replace 3-5 workers, and there is no consumption of grinding wheel consumables, reducing labor and material costs; Improved working environment and environmental compliance: No dust is generated during the scraping process, and the noise is low, which improves the working environment for operators; there are no pollutant emissions, which meets the requirements of environmental protection regulations. Stable coating removal quality: The scraping edge of the rotating punch fits precisely with the surface of the part, and the scraping force is uniform, ensuring that the coating is completely removed without damaging the part substrate, thus improving the quality of subsequent arc welding. Simple structure and easy operation: The mold has a compact overall structure and does not require a complex control system. Operators only need to perform loading and unloading operations, which are easy to master. High versatility: By replacing the appropriate upper die pressure block, floating block and rotating punch, it can be applied to the coating removal of different types of parts such as anti-collision hook parts, with a wide range of applications. Attached Figure Description

[0012] Figure 1 A product illustration of the anti-collision hook part; Figure 2 is a schematic diagram of the structure of this utility model; Figure 3 for Figure 2 Top view; Figure 4 is a schematic diagram of the working state of the mold of this utility model (the left figure is the initial working state, and the right figure is the state after the punching machine has finished scraping the coating). Figure 5 is a schematic diagram of the installation of the rotating punch of this utility model. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: As shown in Figures 2 to 5, this utility model includes an upper mold, a lower mold, and a reset mechanism. The upper mold includes an upper mold base 1, an upper mold pressing block 2, and an upper mold reset pin 3. The upper mold pressing block 2 is fixed below the upper mold base 1 and is adapted to the shape of the anti-collision hook part for pressing the part. The upper mold reset pin 3 is movably inserted into the upper mold base 1, with its lower end extending to a position close to the lower mold, and a reset spring 31 is sleeved on the upper mold reset pin 3. The lower mold includes a lower mold base 6, a floating block 7, a rotating punch 4, a lower mold drive pin 5, and a movable block 8. The floating block 7 is disposed above the lower mold base 6 and corresponds vertically to the upper mold pressing block 2 for supporting the anti-collision hook part. The movable block 8 is slidably disposed in the lower mold base 6 through a guide structure. The rotating punch 4 is hinged to the movable block 8 through a rotating shaft 41. The top end of the rotating punch 4 is provided with a scraping edge 42, which is in contact with the surface of the anti-collision hook part where the coating needs to be removed. The lower mold drive pin... One end of the 5 is fixed to the bottom of the floating block 7, and the other end is inclined to abut against the side wall of the rotating punch 4, forming a wedge-shaped drive engagement; the reset mechanism includes a movable block reset spring 81, which is set between the movable block 8 and the lower die base 6, and is used to drive the movable block 8 and the rotating punch 4 to reset; when the punch press moves downward, the upper die pressure block 2 first presses the anti-collision hook part on the floating block 7, and as the punch press continues to move downward, the upper die pressure block 2 pushes the floating block 7 to move downward synchronously, the floating block 7 drives the lower die drive pin 5 to move downward, and the lower die drive pin 5 pushes the rotating punch 4 to rotate around the rotating shaft 41 through the wedge-shaped abutment action, and the scraping edge 42 at the top of the rotating punch 4 scrapes the coating on the surface of the part; when the punch press moves upward, the upper die reset pin 3 pushes the rotating punch 4 to rotate in the opposite direction to reset under the elastic force of the reset spring 31, and at the same time, the movable block reset spring 81 drives the movable block 8 and the floating block 7 to move upward to reset, completing one coating removal operation.

[0014] The upper die holder 1 of this utility model is fixed to the punch press slide block by bolts, and the lower die holder 6 is fixed to the punch press worktable. The upper die pressure block 2 is fixed to the lower part of the upper die holder 1 by screws, and its lower surface is profiled according to the shape of the anti-collision hook part to ensure full contact with the surface of the part when pressed. The upper die reset pin 3 is inserted into the guide hole of the upper die holder 1, the upper end is limited by the limit nut, the lower end is equipped with a rolling end, and the reset spring 31 is set between the limit step of the upper die reset pin 3 and the upper die holder 1. A floating guide hole is provided on the lower die base 6. A floating guide post 71 is fixed to the bottom of the floating block 7 and slidably fitted inside the floating guide hole. A floating spring 72 is sleeved on the outside of the floating guide post 71, with its two ends abutting against the bottom of the floating block 7 and the internal step of the lower die base 6, respectively. A movable block 8 is slidably set in the receiving cavity of the lower die base 6 through a dovetail groove guide structure. A movable block return spring 81 is set between the rear end of the movable block 8 and the wall of the receiving cavity. A rotating punch 4 is hinged to the front end of the movable block 8 through a rotating shaft 41. The scraping cutting edge 42 is made of cemented carbide welding, and the cutting edge angle is set to 35°, which is adapted to the curvature of the coating surface of the anti-collision hook part. The lower die drive pin 5 is fixed to the bottom of the floating block 7 by threads. A rolling bearing 51 is installed at the lower end through a pin shaft. The rolling bearing 51 contacts the inclined side wall of the rotating punch 4 to form a wedge-shaped drive structure. In use, the anti-collision hook part is placed in the positioning groove of the floating block 7. When the punch press moves downward, the upper die pressing block 2 presses the part and pushes the floating block 7 to move downward. The lower die driving pin 5 drives the rolling bearing 51 to squeeze the rotating punch 4, making it rotate around the rotating shaft 41. The scraping edge 42 scrapes the galvanized coating on the surface of the part. When the punch press moves upward, the upper die reset pin 3 pushes the rotating punch 4 to reset under the action of the reset spring 31. The movable block reset spring 81 drives the movable block 8 and the floating block 7 to move upward, completing the operation. The working process of this utility model is as follows: Loading: Place the anti-collision hook parts to be processed on the floating block 7 of the lower die, ensuring accurate positioning of the parts, with the surface to be coated facing the scraping edge 42 of the rotating punch 4; Clamping and driving: Start the punch press, the upper die moves down with the punch press slide, the upper die pressure block 2 first contacts the surface of the part and clamps the part; the punch press continues to move down, the upper die pressure block 2 overcomes the elastic force of the floating spring 72 and pushes the floating block 7 downward; during the downward movement of the floating block 7, it drives the lower die drive pin 5 to move down synchronously, the rolling bearing 51 at the lower end of the lower die drive pin 5 presses the side wall of the rotating punch 4, and pushes the rotating punch 4 to rotate clockwise around the rotating shaft 41 (as shown in the right half of Figure 4). Coating scraping: During the rotation of the rotating punch 4, the scraping edge 42 at its top end comes into close contact with the zinc coating on the surface of the part and slides relative to it. The coating is peeled off the surface of the part through the scraping action, thus removing the coating. Reset and unloading: After the coating is removed, the punch slide moves upward and the upper die moves upward accordingly. At this time, the upper die reset pin 3 pushes the rotating punch 4 downward under the elastic force of the reset spring 31, so that it rotates counterclockwise around the rotating shaft 41 to reset. At the same time, the movable block reset spring 81 pushes the movable block 8 upward and the floating spring 72 pushes the floating block 7 upward to reset. After the die is completely reset, the processed part is removed, and one work cycle is completed. In this embodiment, a single mold can process two coating areas simultaneously, with a single operation time of 12 seconds. The production efficiency is 25 times higher than manual grinding, and there is no dust emission, significantly improving the working environment. The coating removal qualification rate reaches over 99.5%, effectively ensuring the quality of subsequent arc welding.

Claims

1. A mold for removing coating from the surface of a part, comprising an upper mold, a lower mold, and a resetting mechanism, characterized in that: The upper die includes an upper die base, an upper die pressure block, and an upper die reset pin. The upper die pressure block is fixed below the upper die base. The upper die reset pin is movably inserted into the upper die base, with its lower end extending to a position close to the lower die. A reset spring is fitted over the upper die reset pin. The lower die includes a lower die base, a floating block, a rotating punch, a lower die drive pin, and a movable block. The floating block is positioned above the lower die base. The movable block is slidably positioned within the lower die base via a guide structure. The rotating punch is hinged to the movable block via a rotating shaft. The top of the rotating punch is provided with a scraping edge, which is in contact with the surface of the part where the coating needs to be removed. One end of the lower die drive pin is fixed to the bottom of the floating block, and the other end is inclined against the side wall of the rotating punch, forming a wedge-shaped drive engagement. The reset mechanism includes a movable block reset spring, which is positioned between the movable block and the lower die base to drive the movable block and the rotating punch to reset.

2. The mold for removing the coating from the surface of a part according to claim 1, characterized in that: The scraping cutting edge is made of cemented carbide and has an angle of 30° to 45°.

3. The mold for removing the coating from the surface of a part according to claim 1 or 2, characterized in that: A floating guide post and a floating spring are provided between the floating block and the lower mold base.

4. The mold for removing the coating from the surface of a part according to claim 1 or 2, characterized in that: The lower end of the lower die drive pin is provided with a rolling bearing, which makes rolling contact with the side wall of the rotating punch.

5. The mold for removing the coating from the surface of a part according to claim 1 or 2, characterized in that: The number of rotating punches is matched with the number of parts of the part where the coating needs to be removed.

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