U-shaped decorative chain accessory forming die

Abstract

In order to solve the problems of forming efficiency of the U-shaped decorative chain accessory and recovery allowance of elastic deformation of the U-shaped decorative chain accessory A after a noble metal wire or strip is reserved and formed, the invention adopts the technical scheme that the mould comprises a pair of L-shaped lower moulding beds which are symmetrically mounted to form a complete U-shaped lower moulding bed; the pair of L-shaped lower moulding beds are rotationally installed on the base part through lower moulding bed rotating shafts respectively to form a movable lower moulding bed capable of relatively rotating by a designed angle, the end face of the upper punching die is a trapezoid with the upper end face and the lower end face being arc faces, and the feeding part is composed of a feeding limiting jacking, a jacking support, a fixed cutter plate and a feeding control head. The continuous forming machine has the advantages of being simple in structure, automatic in feeding and discharging and continuous in forming. Recovery allowance of elastic deformation of the U-shaped decorative chain accessory A is reserved by controlling the rotating angle of the pair of L-shaped lower moulding beds.

Description

Technical Field

[0001] This invention relates to metal forming molds, and in particular to a U-shaped decorative chain accessory forming mold that can reserve allowance for elastic recovery and rebound of the part after forming. Background Technology

[0002] In existing technologies, the forming of metal U-shaped parts generally employs thermoforming for large parts. The advantage of thermoforming is accurate forming, but the disadvantage is low efficiency. For smaller parts, cold forming is generally used. The advantage of cold forming is high efficiency, but the disadvantage is that the part's elasticity recovers and rebounds after forming.

[0003] Design a pendant chain (with attachment) composed of U-shaped decorative chain components in the precious metal jewelry industry. Figure 1 and 2 The decorative chain consists of a set of U-shaped decorative chain accessories A, which are welded together after being inserted into connecting rod B. The U-shaped decorative chain accessory A is made of precious metal wire or strip (gold or silver). During the cold stamping process of forming the U-shaped decorative chain accessory A from the precious metal wire or strip, due to the transition from elastic deformation to plastic deformation, after forming, the U-shaped decorative chain accessory A cannot maintain its designed shape due to the partial recovery of elastic deformation. This causes problems for the subsequent assembly of the U-shaped decorative chain accessory A with connecting rod B. Summary of the Invention

[0004] To address the issues of molding efficiency for U-shaped decorative chain accessories and the need for sufficient recovery margin for elastic deformation of the U-shaped decorative chain accessory A after molding with precious metal wires or strips, this invention discloses a molding die for U-shaped decorative chain accessories.

[0005] The technical solution adopted by the present invention to achieve the purpose of the invention is: a U-shaped decorative chain accessory forming mold, the mold comprising: a base part, a lower mold part, an upper punch part and a feeding part.

[0006] The lower tire mold portion includes: a pair of L-shaped lower tire molds arranged symmetrically; The pair of L-shaped lower molds are symmetrically installed to form a complete U-shaped lower mold structure. The pair of L-shaped lower molds are rotatably installed on the base part via the lower mold rotating shaft, forming a pair of L-shaped lower molds that can rotate relative to each other at a designed angle via the lower mold rotating shaft. The upper punch part includes: an upper punch, a punch mounting plate, a punch connecting plate, and a punch support guide column; The end face of the upper punch is a trapezoid with rounded upper and lower end faces. One end face of the upper punch is vertically fixed to the punch mounting plate. The punch mounting plate is guided and slidably inserted into the base part via the mounting plate reset spring. The die mounting plate is fixedly connected to the die support guide column via the die connecting plate, and the die support guide column is slidably inserted into the base via the guide column return spring. The feeding section includes: a feeding limiting support, a support bracket, a fixed blade plate, and a feeding control head. The feeding limiting support is threadedly connected to the support bracket. The support bracket is fixedly connected to the base on one side of a pair of L-shaped lower molds that are symmetrically installed to form a complete U-shaped lower mold. The fixed blade plate is symmetrically installed on a pair of L-shaped lower molds to form a complete U-shaped lower mold. The other side of the mold is fixedly connected to the mounting groove of the base part. The feeding control head has a central hole for feeding. The feeding control head is fixedly connected to the punch support guide column through a sliding groove. The discharge end face of the feeding control head is in sliding contact with the side of the fixed blade plate.

[0007] The beneficial effects of this invention are: it has a simple structure, can realize automatic feeding and unloading, continuous molding, high molding efficiency, and can achieve the recovery margin of elastic deformation of U-shaped decorative chain accessory A after molding by controlling the rotation angle of a pair of L-shaped lower molds. Attached Figure Description

[0008] The present invention will now be described in detail with reference to the accompanying drawings.

[0009] Appendix Figure 1 A schematic diagram of a hanging chain composed of U-shaped decorative chain accessories.

[0010] Appendix Figure 2 Design the shape for U-shaped decorative chain accessories.

[0011] Appendix Figure 3 The U-shaped decorative chain accessory is shaped in a molding die.

[0012] Appendix Figure 4 This is a schematic diagram showing the initial forming of the U-shaped decorative chain accessory using the upper punch die.

[0013] Appendix Figure 5 This is a schematic diagram of the U-shaped decorative chain accessory formed by the upper punch die.

[0014] Appendix Figure 6 This is a diagram showing the initial working state of the present invention.

[0015] Appendix Figure 7 For the appendix Figure 6 A schematic diagram of the AA cross-section.

[0016] Appendix Figure 8 This is a diagram showing the state of operation after the invention has ceased.

[0017] In the attached diagram, the components are: A. AU-type decorative chain fitting; B. connecting rod; C. precious metal wire or strip; 1-1. L-type lower mold; 1-11. lower mold rotating shaft; 1-2. lower mold control ejector rod; 1-3. ejector rod spring; 2. base part; 2-1. limiting protrusion; 3-1. upper punch; 3-2. punch mounting plate; 3-21. mounting plate return spring; 3-3. punch connecting plate; 3-31. limiting ejector pin; 3-4. punch support guide pin; 3-41. guide pin return spring; 4-1. material feeding limiting ejector; 4-2. ejector bracket; 4-3. fixed blade plate; 4-31. wire receiving groove; 4-4. feeding control head. Detailed Implementation

[0018] See the attached drawing. A U-shaped decorative chain accessory molding die includes: a base portion, a lower die portion, an upper punch portion, and a feeding portion.

[0019] The lower tire mold portion includes: a pair of symmetrically arranged L-shaped lower tire molds 1-1.

[0020] After the pair of L-shaped lower molds 1-1 are symmetrically installed, the arcs at the lower ends of the L-shaped lower molds 1-1 correspond to each other, forming a complete lower mold of a U-shaped molding mold.

[0021] The pair of L-shaped lower molds 1-1 are symmetrically installed to form a complete U-shaped lower mold structure. The pair of L-shaped lower molds 1-1 are rotatably installed on the base part 2 via the lower mold rotating shaft 1-11, forming a pair of L-shaped lower molds 1-1 that can rotate relative to each other at a designed angle via the lower mold rotating shaft 1-11.

[0022] The upper punch part includes: upper punch 3-1, punch mounting plate 3-2, punch connecting plate 3-3, and punch support guide column 3-4.

[0023] The end face of the upper punch 3-1 is a trapezoid with rounded ends. One end face of the upper punch is vertically fixed to the punch mounting plate 3-2. The punch mounting plate 3-2 is guided and slidably inserted into the base part 2 via the mounting plate reset spring 3-21.

[0024] When the upper punch 3-1, driven by the punch mounting plate 3-2, enters the complete U-shaped lower mold formed by the symmetrical installation of the L-shaped lower mold 1-1, under the action of the upper punch 3-1, the pair of L-shaped lower molds 1-1 rotate around the lower mold pivot 1-11 respectively, forming a U-shaped lower mold. Figure 5 Posture. The U-shaped decorative chain accessory A within the L-shaped lower mold 1-1, such as... Figure 3 Shape (plastic deformation plus elastic deformation). When the U-shaped decorative chain accessory A leaves the invention, the elastically deformed portion of the U-shaped decorative chain accessory A (with a reserved recovery allowance for elastic deformation) recovers its elastic deformation, as follows: Figure 2 Shape (standard design shape).

[0025] The allowable recovery margin for the elastic deformation of the U-shaped decorative chain accessory A is achieved by the upper punch 3-1 pushing the L-shaped lower mold 1-1 to rotate around the lower mold shaft 1-11. Its size can be determined by the amount of movement of the upper punch 3-1 based on the physical properties of the precious metal wire or strip C.

[0026] The die mounting plate 3-2 is fixedly connected to the die support guide column 3-4 via the die connecting plate 3-3, and the die support guide column 3-4 is slidably inserted into the base part 2 via the guide column return spring 3-41.

[0027] Under the action of the press, the die connecting plate 3-3, along with the die mounting plate 3-2, drives the upper die 3-1 to continuously form the U-shaped decorative chain accessory A with the L-shaped lower die 1-1, guided by the die mounting plate 3-2 and the die support guide column 3-4. After the action of the press is removed, the die mounting plate 3-2 and the die support guide column 3-4 are reset under the action of the mounting plate return spring 3-21 and the guide column return spring 3-41.

[0028] The feeding section includes: a feeding limiting top support 4-1, a top support bracket 4-2, a fixed blade plate 4-3, and a feeding control head 4-4. The feeding limiting top support 4-1 is threadedly connected to the top support bracket 4-2. The top support bracket 4-2 is fixedly connected to the base part 2 on one side of a pair of L-shaped lower molds 1-1 symmetrically installed to form a complete U-shaped lower mold. The fixed blade plate 4-3 is fixedly connected to the mounting groove of the base part 2 on the other side of a pair of L-shaped lower molds 1-1 symmetrically installed to form a complete U-shaped lower mold. The feeding control head 4-4 has a central hole for feeding. The feeding control head 4-4 is fixedly connected to the punch support guide column 3-4 through a sliding groove. The discharge end face of the feeding control head 4-4 is in sliding contact with the side of the fixed blade plate 4-3.

[0029] See appendix Figure 6 When one end of the precious metal wire or strip C passes through the center hole of the feed control head 4-4, the upper end face of the fixed blade plate 4-3, and the upper end face of the L-shaped lower mold 1-1, and hits the end face of the feeding limit support 4-1, the distance between the discharge end of the feed control head 4-4 and the end face of the feeding limit support 4-1 is the cutting length of the U-shaped decorative chain accessory A.

[0030] The feeding length of the U-shaped decorative chain accessory A can be adjusted by adjusting the distance between the discharge end face of the feeding control head 4-4 and the end face of the feeding limit support 4-1.

[0031] In this embodiment of the invention, the feeding limiting top support 4-1 and the top support bracket 4-2 can be adjusted in position via threads. The feeding control head 4-4 is adjusted by changing its position within the chute. Simultaneously, the fixed blade plate 4-3 is adjusted to maintain contact with the discharge end face of the feeding control head 4-4 at the mounting groove position of the base part 2.

[0032] When the feed control head 4-4 moves downward along with the die support guide column 3-4, the outlet end face of the feed control head 4-4 and the fixed blade plate 4-3 cut the precious metal wire or strip C when the upper die 3-1 comes into contact with it.

[0033] In this embodiment of the invention, a limiting protrusion 2-1 is provided on the base portion 2, and a limiting top post 3-31 is provided on the die connecting plate 3-3 at a vertically corresponding position to the limiting protrusion 2-1. The descent distance of the upper die 3-1 is controlled by designing the distance between the limiting protrusion 2-1 and the limiting top post 3-31. This prevents excessive descent of the upper die 3-1 from deforming the precious metal wire or strip C, thus affecting product quality.

[0034] In this embodiment of the invention, the lower mold part further includes: a lower mold control push rod 1-2 and a push rod spring 1-3. The lower mold control push rod 1-2 forms a sliding insertion structure with a designed stroke in the base part 2 via the push rod spring 1-3. The upper end face of the lower mold control push rod 1-2 contacts the lower end of the U-shaped lower mold formed by a pair of L-shaped lower molds 1-1.

[0035] When the upper punch 3-1 applies force to the L-shaped lower mold 1-1 (during molding), it pushes the L-shaped lower mold 1-1 to rotate around the lower mold shaft 1-11. At this time, the lower mold control ejector rod 1-2 and ejector spring 1-3 are in a compressed state. When the force applied by the upper punch 3-1 disappears, the lower mold control ejector rod 1-2 resets under the action of the ejector spring 1-3. The lower mold control ejector rod 1-2 pushes the L-shaped lower mold 1-1 to rotate in the opposite direction around the lower mold shaft 1-11 to reset.

[0036] In this embodiment of the invention, the upper end face of the fixed blade 4-3 is provided with a wire receiving groove 4-31. The wire receiving groove 4-31 prevents the cross-section of the precious metal wire or strip C from deforming when it is cut, thus affecting the next process.

[0037] In this embodiment of the invention, the feeding end of the feeding control head 4-4 is connected to a continuous feeding mechanism. Through this continuous feeding mechanism, the invention can achieve automated continuous production.

Claims

1. A U-shaped decorative chain accessory forming mold, the forming mold comprising: The base part, the lower tire mold part, the upper punch part and the feeding part are characterized by: The lower tire mold part comprises: a pair of L-shaped lower tire molds (1-1) arranged symmetrically; The pair of L-shaped lower tire molds (1-1) are symmetrically installed to form a complete U-shaped lower tire mold structure. The pair of L-shaped lower tire molds (1-1) are rotatably installed on the base part (2) via the lower tire mold rotating shaft (1-11), forming a pair of L-shaped lower tire molds (1-1) that can be relatively rotated by a designed angle via the lower tire mold rotating shaft (1-11). The upper punch part comprises: an upper punch (3-1), a punch mounting plate (3-2), a punch connecting plate (3-3) and a punch supporting guide column (3-4); The end face of the upper punch (3-1) is a trapezoid with arc-shaped upper and lower end faces; one end face of the upper punch is vertically fixedly connected to a punch mounting plate (3-2); the punch mounting plate (3-2) is guided and slidably plugged into the base portion (2) via a mounting plate return spring (3-21); The die mounting plate (3-2) is fixedly connected to the die support guide column (3-4) via the die connecting plate (3-3); the die support guide column (3-4) is guided and slidably plugged into the base portion (2) via a guide column return spring (3-41); The feeding part comprises: a feeding limit support (4-1), a support bracket (4-2), a fixed blade plate (4-3) and a feeding control head (4-4); the feeding limit support (4-1) is threadedly connected to the support bracket (4-2); the support bracket (4-2) is symmetrically installed on a pair of L-shaped lower tire molds (1-1) to form a complete U-shaped lower tire mold and is fixedly connected to the base part (2) on one side; the fixed blade plate (4-3) is symmetrically installed on a pair of L-shaped lower tire molds (1-1) in the lower tire mold part to form a complete U-shaped lower tire mold and is fixedly connected in the installation groove of the base part (2); the feeding control head (4-4) has a central hole for feeding through; the feeding control head (4-4) is fixedly connected to the die support guide column (3-4) through a sliding groove; the discharge end face of the feeding control head (4-4) is in sliding contact with the side face of the fixed blade plate (4-3).

2. A U-shaped decorative chain accessory forming mold according to claim 1, characterized in that: A limiting protrusion (2-1) is provided on the base portion (2), and a limiting top column (3-31) is provided on the die connecting plate (3-3) at a position vertically corresponding to the limiting protrusion (2-1).

3. A U-shaped decorative chain accessory forming mold according to claim 1 or 2, characterized in that: The lower tire mold part also includes: a lower tire mold control push rod (1-2) and a push rod spring (1-3), the lower tire mold control push rod (1-2) forms a sliding plug-in structure with a designed stroke on the base part (2) through the push rod spring (1-3), and the upper end surface of the lower tire mold control push rod (1-2) contacts the lower end of a U-shaped lower tire mold formed by a pair of L-shaped lower tire molds (1-1).

4. A U-shaped decorative chain accessory forming mold according to claim 1 or 2, characterized in that: The upper end surface of the fixed blade plate (4-3) is provided with a wire accommodating groove (4-31).

5. A U-shaped decorative chain accessory forming mold according to claim 1 or 2, characterized in that: The feeding end of the feeding control head (4-4) is connected to a continuous feeding mechanism.

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