Flat-top chain link pin hole forming die

Abstract

This invention relates to a pin hole forming mold for flat-top chain plates, comprising a lower mold assembly and an upper mold assembly. The lower mold assembly includes a lower template, a die holder fixedly mounted on the lower template, and a slider movable relative to the die holder. A first chain plate support platform is provided on the die holder, and a first pin hole forming surface is provided at the end of the first chain plate support platform. A second chain plate support platform is provided on the slider, and a second pin hole forming surface is provided at the end of the second chain plate support platform. This invention solves the problems of localized thinning caused by existing pin hole forming processes, leading to chain plate pull-out and breakage under stress, thus affecting the chain plate's service life. It can be widely used in the processing of flat-top chain plates.

Description

Technical Field

[0001] This invention relates to the field of flat-top chain plate processing and forming technology, and in particular to a pin hole forming mold for flat-top chain plates. Background Technology

[0002] Flat-top chains are widely used in the conveying industry, and are typically made of interconnected metal chain plates. The chain plates of a flat-top chain have pin holes on both sides for mounting pins. Currently, the processing technology for the metal chain plates includes blanking, stamping and chamfering, pre-rolling, bending at the end of the pin hole forming edge, a 90° forming process to stamp the pin hole forming edge into a 90-degree angle, and a forming and pressing process to form the pin hole using a forming die. In the structure formed by the 90° forming process, the metal sheet undergoes stretching and localized thinning at the 90° angle during stamping, which affects the strength of the formed pin hole. When the chain plate tension increases, the pin hole location is prone to pull-out or breakage, resulting in chain plate damage. Therefore, it is necessary to adjust the forming process of the pin hole to overcome the defects of the existing stamping process. Summary of the Invention

[0003] The purpose of this invention is to provide a flat-top chain plate pin hole forming mold, which solves the problem that the existing pin hole forming process easily causes local thinning, and the chain plate is easily pulled off or broken under stress, affecting the service life of the chain plate.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a flat-top chain plate pin hole forming mold, including a lower mold assembly and an upper mold assembly. The lower mold assembly includes a lower template, a cavity mold seat fixedly disposed on the lower template, and a slider that can move back and forth relative to the cavity mold seat. A first chain plate support platform is disposed on the cavity mold seat, and a first pin hole forming curved surface is disposed at the end of the first chain plate support platform. A second chain plate support platform is disposed on the slider, and a second pin hole forming curved surface is disposed at the end of the second chain plate support platform. The first pin hole forming curved surface extends upward from the end of the first chain plate support platform, and the second pin hole forming curved surface extends upward from the end of the second chain plate support platform. A guide structure for guiding the plate to roll inward to form a pre-formed pin hole is disposed at the top of both the first pin hole forming curved surface and the second pin hole forming curved surface.

[0005] To facilitate control of the slider's movement, the upper mold assembly includes an upper mold plate, a wedge mounted on the upper mold plate to drive the slider's movement, and a return spring between the slider and the lower mold plate.

[0006] To ensure the roundness of the first and second pin holes, the upper template is also provided with a shaping punch. The shaping punch is provided with a first shaping surface corresponding to the forming surface of the first pin hole, and a second shaping surface corresponding to the forming surface of the second pin hole.

[0007] Furthermore, a retractable shaping rod is provided on one side of the die holder, and the shaping rod is placed in the pre-forming pin hole during shaping.

[0008] Preferably, the guiding structure comprises a first guide cover plate fixed on the die holder and a second guide cover plate fixed on the slider, wherein the end of the first guide cover plate extends beyond the first pin hole forming surface and the end of the second guide cover plate extends beyond the second pin hole forming surface.

[0009] In order for the mold to process two flat-top chain plates at the same time, two concave mold bases are symmetrically arranged on the lower template, two sliders are symmetrically arranged on the lower template, and a return spring is provided between the two sliders.

[0010] To reduce the frictional resistance between the wedge and the slider and to make the slider move more smoothly, a rolling bearing is provided on the slider.

[0011] To facilitate control of the back-and-forth movement of the shaping rod, one end of the shaping rod is connected to a drive cylinder that moves the shaping rod.

[0012] To ensure the smooth operation of the slider, a slide rail is provided on the lower template, and the slider is slidably mounted on the slide rail.

[0013] The beneficial effects of this invention are as follows: During mold closing, the wedge acts on the slider, driving it towards the die seat. This causes the two ends of the flat-top chain plate to curl and form under the action of the first and second pin hole forming surfaces, respectively. This results in high forming efficiency. Furthermore, the plates with the first and second pin holes formed by this method are compressed during curling, resulting in a thicker material than before curling. Therefore, the strength at the chain plate connection is better, and the tensile force required for deformation is greater, effectively improving the conveying capacity of the chain plate. After curling, a shaping punch is used to shape the curled pin holes, ensuring the quality and consistency of the forming. Adding a shaping rod to the shaping punch further enhances the shaping effect. Rolling bearings on the slider reduce friction between the wedge and the slider, improving the smoothness of slider movement, reducing mold wear, and thus improving slider movement accuracy and ensuring the forming effect. Symmetrically arranged die seats and sliders on the lower mold assembly allow the mold to process two chain plates simultaneously, effectively improving processing efficiency and saving production costs.

[0014] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present invention.

[0016] Figure 2 This is a front view of Embodiment 1 of the present invention.

[0017] Figure 3 This is a schematic diagram of the lower mold assembly in Embodiment 1 of the present invention.

[0018] Figure 4 This is a schematic diagram of the upper mold assembly in Embodiment 1 of the present invention.

[0019] Figure 5 This is a side view of Embodiment 1 of the present invention.

[0020] Figure 6 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0021] Figure 7 This is a front view of Embodiment 2 of the present invention.

[0022] Figure 8 This is a schematic diagram of the lower mold assembly in Embodiment 2 of the present invention.

[0023] Figure 9 This is a schematic diagram of the upper mold assembly in Embodiment 2 of the present invention.

[0024] Figure 10 This is a side view of Embodiment 2 of the present invention.

[0025] Figure 11 This is a structural schematic diagram of a pre-bent component.

[0026] Figure 12 This is the flat-top chain plate after molding. Detailed Implementation

[0027] Example 1: A pin hole forming mold for a flat-top chain plate, used to form pin holes on both sides of a flat-top chain plate, such as... Figures 11 to 12 As shown, the pre-bent part 20 before processing and forming includes a chain plate main body 201, two first pins 202, and a second pin 203. The ends of the first pins 202 and the second pin 203 are pre-bent into arc-shaped bends 204. The purpose of this invention is to roll the first pin 202 into a first pin hole 101 and roll the second pin 203 into a second pin hole 102.

[0028] like Figures 1 to 5As shown, the flat-top chain plate pin hole forming mold of the present invention includes a lower mold assembly 1 and an upper mold assembly 2. The lower mold assembly 1 includes a lower template 11, a cavity mold base 3 fixedly mounted on the lower template 11, and a slider 4 movable back and forth relative to the cavity mold base 3. A first chain plate support platform 31 is provided on the cavity mold base 3, and a first pin hole forming curved surface 32 is provided at the end of the first chain plate support platform 31, extending upward from the end of the first chain plate support platform 31. A guide structure is provided at the top of the first pin hole forming curved surface 32 to guide the plate material to roll inward to form a pre-formed pin hole. The guide structure preferably adopts a first guide cover plate 33 fixed on the cavity mold base 3 for easy disassembly and assembly. The end of the first guide cover plate 33 extends beyond the first pin hole forming curved surface 32. Of course, an arc surface structure bending downward from the top can also be used.

[0029] The slider 4 is provided with a second chain plate support platform 41. A second pin hole forming curved surface 42 is provided at the end of the second chain plate support platform 41, extending upwards from the end of the second chain plate support platform 41. A guide structure is also provided at the top of the second pin hole forming curved surface 42 to guide the plate material to curl inwards to form a pre-formed pin hole. Preferably, the guide structure is a second guide cover plate 43 fixed to the slider 4, with the end of the second guide cover plate 43 extending beyond the second pin hole forming curved surface 42. The movement of the slider 4 causes the pre-bent member 20 placed on the first chain plate support platform 31 and the second chain plate support platform 41 to be pressed, causing the first pin 202 to bend along the first pin hole forming curved surface 32, and the second pin 203 to bend along the second pin hole forming curved surface 42.

[0030] To ensure the reliability of the movement of the slider 4, a slide rail 9 is provided on the lower template 11, a guide groove 91 is provided on the slide rail 9, and a guide strip 45 adapted to the guide groove 91 is provided on the slider 4. The slider 4 can be slidably mounted on the slide rail 9 through the cooperation of the guide groove 91 and the guide strip 45, thereby ensuring that the slider 4 moves in a straight line.

[0031] Since there are two first pins 202 and only one second pin 203, and the widths of the first pin 202 and the second pin 203 are basically the same, under the same extrusion force, the second pin 203 will curl and form first. To ensure that the second pin 203 provides sufficient support for the forming of the first pin 202 after curling, and to protect the second pin 203 from further deformation under pressure after curling, the slider 4 is provided with top blocks 46 on both sides of the second chain plate support platform 41. The top blocks 46 correspond to the shoulders 205 of the chain plate. After the second pin 203 is curled and formed, the top blocks 46 press against the ends of the shoulders 205 of the chain plate. A return spring 5 is also provided between the slider 4 and the lower template 11 for the automatic reset of the slider 4.

[0032] The upper mold assembly 2 includes an upper template 21 and an inclined wedge 8 disposed on the upper template 21 to drive the slider 4 to move toward the die seat 3. When the upper mold assembly 2 moves downward, the inclined wedge 8 acts on the end of the slider 4, driving the slider 4 to move continuously toward the die seat 3.

[0033] To ensure the first and second pin holes are properly formed into a cylindrical shape for easy pin assembly, a forming punch 6 is also provided on the upper template 21. The forming punch 6 has a first forming surface 61 corresponding to the first pin hole forming surface 32, and a second forming surface 62 corresponding to the second pin hole forming surface 42. When the wedge 8 drives the slider 4 to its position, the first pin hole 101 and the second pin hole 102 are curled and formed. The upper mold assembly 2 continues to move downwards, and the first forming surface 61 and the second forming surface 62 on the forming punch 6 act on the first pin hole 101 and the second pin hole 102 respectively, shaping them.

[0034] To ensure the shaping effect, the die holder 3 is also equipped with two retractable shaping rods 7. During shaping, the two shaping rods 7 extend into the first pin hole 101 and the second pin hole 102 respectively, ensuring that they are not flattened during shaping and improving the shaping effect. To facilitate the extension and retraction of the shaping rods 7, a drive cylinder 71 is provided at one end of each shaping rod 7, and the shaping rod 7 is fixedly installed on the extension shaft of the drive cylinder 71. During shaping, the shaping rod 71 first extends into the forming pin hole, and then the shaping punch 6 presses against the outer surface of the forming pin hole.

[0035] The working principle of this invention is as follows: First, the pre-bent part 20 is placed on the first chain plate support platform 31 and the second chain plate support platform 41, with the first pin 202 facing the die seat 3 and the second pin 203 facing the slider 4. The arc-shaped bend 204 on the first pin 202 is brought close to the junction of the first pin hole forming surface 32 and the first chain plate support platform 31. Then, the upper die assembly 1 drives the wedge 8 to move downward. The inclined surface of the wedge 8 acts on the slider 4, and the slider 4 is squeezed and moves towards the die seat 3. At this time, the return spring 5 is stretched by force. When the pre-bent part 20 is squeezed, the second pin 203 is first bent and formed to form the second pin hole 102. After the second pin hole 102 is formed, the top block 46 on the slider 4 presses on the end face of the shoulder 205. The slider 4 continues to move towards the die seat 3, so that the first pin 202 moves along the first pin hole forming surface 32 and bends to form the first pin hole 101. During this process, the second pin hole 102 will not be subjected to force under the support of the top block 46, ensuring that the second pin hole 102 will not be deformed. After the first pin hole 101 and the second pin hole 102 are bent and formed, the drive cylinder 71 drives the shaping rod 7 to extend into the first pin hole 101 and the second pin hole 102 respectively. Then the upper mold assembly 1 continues to move downward. At this time, the slider 4 no longer moves. The first shaping surface 61 on the shaping punch 6 driven by the upper mold assembly 1 acts on the outer surface of the first pin hole 101, and the second shaping surface 62 acts on the outer surface of the second pin hole 102. Through the inner and outer cooperation of the first shaping surface 61 and the second shaping surface 62 with the shaping rod 7, the first pin hole 101 and the second pin hole 102 are shaped so that the arc meets the requirements. After shaping, the drive cylinder 71 drives the shaping rod 7 to retract and be pulled out from the first pin hole 101 and the second pin hole 102. The upper mold assembly 1 drives all components to move upward and away from the lower mold assembly 2. When the wedge 8 moves upward, the slider 4 is reset under the contraction force of the return spring 5. At this point, the mold completes one stamping, and the formed flat-top chain plate is obtained.

[0036] Example 2: Figures 6 to 10As shown, a pin hole forming mold for a flat-top chain plate is used to form pin holes on both sides of a flat-top chain plate. It includes a lower mold assembly 1 and an upper mold assembly 2. The lower mold assembly 1 includes a lower template 11, a die holder 3 fixedly mounted on the lower template 11, and sliders 4 that can move back and forth relative to the die holder 3. Two die holders 3 are symmetrically arranged on the lower template 11, and two sliders 4 are also symmetrically arranged on the lower template 11. A return spring 5 is provided between the two sliders 4. To reduce the resistance of the sliders 4 engaging with the wedges 8, rolling bearings 44 are provided on the sliders 4, and mating holes 81 that engage with the wedges 8 are provided between the rolling bearings 44 of the two sliders 4. The wedges 8 descend and enter the mating holes 81, acting on the rolling bearings 44 to drive the two sliders 4 to move simultaneously to both sides, engaging with the die holders 3 on both sides to form the pin holes. Using a symmetrical structure, the mold can simultaneously form two chain plates in one stamping process, effectively improving the efficiency of chain plate processing. Other aspects are the same as in Embodiment 1.

[0037] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A flat-top chain plate pin hole forming mold, comprising a lower mold assembly (1) and an upper mold assembly (2), characterized in that: The lower mold assembly (1) includes a lower mold plate (11), a cavity mold base (3) fixedly mounted on the lower mold plate (11), and a slider (4) that can move back and forth relative to the cavity mold base (3). A first chain plate support platform (31) is provided on the cavity mold base (3). A first pin hole forming curved surface (32) is provided at the end of the first chain plate support platform (31). A second chain plate support platform (41) is provided on the slider (4). A second pin hole forming curved surface (42) is provided at the end of the second chain plate support platform (41). The first pin hole forming curved surface (32) extends upward from the end of the first chain plate support platform (31). The second pin hole forming curved surface (42) extends upward from the end of the second chain plate support platform (41). A guide structure for guiding the plate to roll inward to form a pre-formed pin hole is provided at the top of both the first pin hole forming curved surface (32) and the second pin hole forming curved surface (42). The upper mold assembly (2) includes an upper mold plate (21), an inclined wedge (8) on the upper mold plate (21) to drive the slider (4) to move, and a return spring (5) is also provided between the slider (4) and the lower mold plate (11); The upper template (21) is also provided with a shaping punch (6), the shaping punch (6) is provided with a first shaping surface (61) corresponding to the first pin hole forming surface (32), and a second shaping surface (62) corresponding to the second pin hole forming surface (42); A retractable shaping rod (7) is also provided on one side of the die holder (3). During shaping, the shaping rod (7) is placed in the pre-forming pin hole. The guiding structure consists of a first guide cover plate (33) fixed on the die holder (3) and a second guide cover plate (43) fixed on the slider (4). The end of the first guide cover plate (33) extends beyond the first pin hole forming surface (32), and the end of the second guide cover plate (43) extends beyond the second pin hole forming surface (42).

2. The flat-top chain plate pin hole forming mold as described in claim 1, characterized in that: Two concave mold bases (3) are symmetrically arranged on the lower template (11), and two sliders (4) are symmetrically arranged on the lower template (11). A reset spring (5) is provided between the two sliders (4).

3. The flat-top chain plate pin hole forming mold as described in claim 1, characterized in that: The slider (4) is provided with a rolling bearing (44).

4. The flat-top chain plate pin hole forming mold as described in claim 1, characterized in that: One end of the shaping rod (7) is connected to a drive cylinder (71) that drives the shaping rod (7) to move.

5. The flat-top chain plate pin hole forming mold as described in claim 1, characterized in that: The lower template (11) is provided with a slide rail (9), and the slider (4) is slidably disposed on the slide rail (9).

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