Forming device with hollow cylindrical mold core

Abstract

The utility model provides a forming device with a hollow cylindrical die core, which is used for cold heading forming of nuts containing riveting walls, and comprises a die frame, a concave die body, the hollow cylindrical die core, a core punching rod, a concave cushion block, a hollow annular cushion block, a T-shaped hollow cushion block and a flat wire spiral spring, the hollow cylindrical die core is movably connected with a central through hole of the female die body and used for receiving materials, and the punching core rod is movably connected with the central through hole of the hollow cylindrical die core and used for upsetting the materials. The hollow cylindrical die core, the concave cushion block and the hollow annular cushion block are sequentially connected in an abutting mode. The T-shaped hollow cushion block is movably connected with the central through hole of the hollow annular cushion block, and one end of the T-shaped hollow cushion block comprises a flange face protruding in the radial direction. The two ends of the flat wire spiral spring are connected with the hollow annular cushion block and the flange face respectively and used for jacking the hollow cylindrical die core. The device can be used for continuous mass production, and the production efficiency is higher.

Description

Technical Field

[0001] The utility model relates to a cold heading forming device for nuts, and particularly to a forming device with a hollow cylindrical die core for receiving blanks in the subsequent process after cold heading forming of nuts with riveting walls. Background Art

[0002] Cold heading forming technology is a processing method with high comprehensive economic benefits, high added value and high efficiency for processing fasteners, special-shaped parts and casing products. It is the preferred processing method usually adopted in the fastener industry and is also an advanced processing method widely used at home and abroad with development prospects.

[0003] With the development of technology and the progress of technology, the products of conventional fuel vehicles and new energy vehicles are changing with each passing day, putting forward higher requirements for fastener products. Automobile parts are an important field and means for China's automobile industry to participate in globalization through the global supply chain, international trade, technological progress, etc., to enhance its international influence. The cold heading process of fasteners with riveting walls has been very mature with the advancement of new technologies, and usually five-station forming is adopted to meet the high-quality requirements of customers.

[0004] In the cold heading forming process of the existing nut cold heading forming device, problems such as unstable blank receiving, incorrect clamping by the clamp, and inclined feeding into the die resulting in scrapping of the cold heading product due to scraping of the riveting wall are likely to occur. When facing such technical problems of fasteners, general measures for preventing blank receiving from tilting cannot ensure the stability of batch continuous production, and the comprehensive economic benefits are not high, which is not conducive to realizing large-scale continuous automated production.

[0005] Therefore, there is still room for improvement in the existing nut cold heading forming device. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a forming device with a hollow cylindrical die core for blank receiving, which is efficient, stable and reliable, so as to solve the problems of the existing technology.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A forming device with a hollow cylindrical die core is provided for cold heading forming of riveted wall nuts. The forming device includes a die holder, a female die body, a hollow cylindrical die core, a punching core rod, a concave-shaped cushion block, a hollow annular cushion block, a T-shaped hollow cushion block, and a flat wire spiral spring. The female die body is arranged in the die holder. The hollow cylindrical die core is movably connected to the central through hole of the female die body for receiving materials. The punching core rod is movably connected to the central through hole of the hollow cylindrical die core for material upsetting. The hollow cylindrical die core, the concave-shaped cushion block, and the hollow annular cushion block are sequentially abutted and connected. The T-shaped hollow cushion block is movably connected to the central through hole of the hollow annular cushion block. One end of the T-shaped hollow cushion block includes a radially protruding flange surface. The two ends of the flat wire spiral spring are respectively connected to the hollow annular cushion block and the flange surface for jacking up the hollow cylindrical die core.

[0009] Preferably, the forming device further includes a cylindrical cushion block and a T-shaped solid cushion block. The two ends of the cylindrical cushion block are respectively connected to the punching core rod and the T-shaped solid cushion block for driving the punching core rod to move when under force. A radially protruding connecting surface is provided at one end of the punching core rod, and the connecting surface is arranged in the T-shaped hollow cushion block.

[0010] Preferably, the die holder includes a fixed front seat and a fixed tail pad. The fixed front seat and the fixed tail pad are connected to form a die cavity. The female die body is arranged at one end of the fixed front seat, and the fixed tail pad is arranged at the other end of the fixed front seat.

[0011] The purpose of this application is to design a forming device that uses a hollow cylindrical die core to replace the single hanging platform ejector rod material receiving device in the prior art. The hollow cylindrical die core is used for material receiving, anti-rotation, and anti-tilting, solving the technical problems of easy material rotation and unstable clamping during the processing of fasteners, and also solving the problem of unstable material receiving of the cylindrical punching core and scratching the riveted wall during the forming of fasteners, thereby reducing production costs and debugging difficulties, ensuring the quality requirements of products, and improving the market competitiveness of the company.

[0012] Compared with the prior art, the present utility model has the following beneficial effects:

[0013] 1. The device of this application can be continuously mass-produced;

[0014] 2. The production efficiency of the parts of the device of this application is higher;

[0015] 3. The appearance of the parts produced by this application at the riveted wall is more beautiful, the quality is more stable, and the enterprise benefits are improved.

[0016] Of course, when implementing any specific embodiment of the content of the present utility model, it does not necessarily achieve all the above technical effects at the same time. Description of the Drawings

[0017] Other features, objectives, and advantages of the present utility model will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings:

[0018] Figure 1 Schematic diagram of the forming device for the hollow cylindrical die core of the present application;

[0019] Figure 2 Schematic diagram of the comparison of the front and rear material receiving of the processed parts of the present application. Specific embodiments

[0020] The present utility model will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made. These all belong to the protection scope of the present utility model.

[0021] Please refer to Figure 1 The schematic diagram of the forming device for the hollow cylindrical die core of the present application. The present application uses a hollow cylindrical die core to replace the single hanging platform ejector rod material receiving device in the prior art. Under the action of a flat wire spiral spring, the hollow annular spacer, concave spacer, and T-shaped hollow spacer slide to push the hollow cylindrical die core forward to support the hollow annular riveting wall of the part. The mass continuous production of the part is more stable, and the appearance of the riveting wall (i.e., the annular wall) of the part is more beautiful and the quality is more stable.

[0022] As Figure 1 shown, a forming device with a hollow cylindrical die core of the present application is used for the cold heading forming of nuts with riveting walls, that is, it is applicable to nuts including annular walls. The so-called cold heading is to use a die to upset and form a metal rod at room temperature. When cold heading, the annular wall is sleeved on the hollow cylindrical die core to play the role of material receiving and entering the die; Figure 1 In, the forming device includes a die holder, a die body 1, a hollow cylindrical die core 2, a punching core rod 3, a concave spacer 4, a hollow annular spacer 5, a T-shaped hollow spacer 6, and a flat wire spiral spring 9. The die body 1 is arranged in the die holder and is sleeved at one end facing the blank 99; the hollow cylindrical die core 2 is movably connected to the central through hole of the die body 1 for material receiving. Please refer to Figure 2 , in order to facilitate understanding of the relative relationship between the blank 99 and the hollow cylindrical die core 2, three figures are compared together. The vertical dotted line in the figure represents the die surface position. In the uppermost figure, the hollow cylindrical die core 2 extends out waiting for material receiving. In the middle figure, the hollow cylindrical die core 2 extends out and the material receiving is completed. In the lowermost figure, after the hollow cylindrical die core 2 supports the annular wall and moves backward, the blank 99 is compressed and formed.

[0023] In addition, the punching mandrel 3 is movably connected to the central through hole of the hollow cylindrical die core 2 for material upsetting. After the hollow cylindrical die core 2 finishes receiving the material and moves, the punching mandrel 3 punches the blank 99 to perform a cold upsetting shaping process. Under the combined impact of the punching rod 12 and the punching mandrel 3, the appearance of the blank 99 is pressed into the shape of the die cavity of the die body 1; the hollow cylindrical die core 2, the concave-shaped cushion block 4, and the hollow annular cushion block 5 are sequentially abutted and connected. Figure 1 When the hollow annular cushion block 5 moves leftward, it drives the hollow cylindrical die core 2 to move leftward; the T-shaped hollow cushion block 6 is movably connected to the central through hole of the hollow annular cushion block 5, and one end of the T-shaped hollow cushion block 6 includes a radially protruding flange surface 61; both ends of the flat wire spiral spring 9 are respectively connected to the hollow annular cushion block 5 and the flange surface 61 for jacking up the hollow cylindrical die core 2. The action mode is as follows: the flange surface 61 is stressed to squeeze the flat wire spiral spring 9, and the spring force or thrust of the flat wire spiral spring 9 pushes the hollow annular cushion block 5 to drive the concave-shaped cushion block 4 and the hollow cylindrical die core 2 to move together.

[0024] Please refer to Figure 1 , the shaping device further includes a cylindrical cushion block 7 and a T-shaped solid cushion block 8. Both ends of the cylindrical cushion block 7 are respectively connected to the punching mandrel 3 and the T-shaped solid cushion block 8 for driving the punching mandrel 3 to move when stressed. One end of the punching mandrel 3 is provided with a radially protruding connecting surface 31, and the connecting surface 31 is arranged in the T-shaped hollow cushion block 6. The action mode is as follows: Figure 1 When the T-shaped solid cushion block 8 is stressed and moves leftward, it drives the cylindrical cushion block 7 and the punching mandrel 3 to move leftward. The moving punching mandrel 3 impacts and shapes the blank 99; the connecting surface 31 in the T-shaped hollow cushion block 6 abuts and connects to the bottom inner wall of the T-shaped hollow cushion block 6. When the punching mandrel 3 moves leftward, it drives the T-shaped hollow cushion block 6 to move leftward, forming the above-mentioned movement of driving the hollow cylindrical die core 2 to move together.

[0025] Figure 1 In the above, the die holder includes a fixed front seat 10 and a fixed tail pad 11. The fixed front seat 10 and the fixed tail pad 11 are connected to form a die cavity. The die body 1 is arranged at one end of the fixed front seat 10, and the fixed tail pad 11 is arranged at the other end of the fixed front seat 10; the inner edge surface of the fixed front seat 10 includes a stepped surface, and the stepped surface is used to limit the hollow annular cushion block 5. When the hollow annular cushion block 5 abuts and connects to the stepped surface, the hollow cylindrical die core 2 moves leftward to reach the material receiving position.

[0026] Next, the working principle of the present application will be described. Please refer to Figure 1 and Figure 2 :

[0027] 1. Before the hollow cylindrical die core 2 receives the material, the flat wire spiral spring 9 supports the T-shaped hollow spacer block 6 to push the hollow annular spacer block 5 to carry the concave spacer block 4 to push the hollow cylindrical die core 2 to slide forward;

[0028] 2. Before the blank 99 enters the die body 1, the hollow cylindrical die core 2 can only move forward to receive the material under the fixation of the punching core rod 3 and the T-shaped hollow spacer block 6;

[0029] 3. When the blank 99 starts to enter the die body 1, the part riveting wall (annular wall) slowly approaches the hollow cylindrical die core 2 until the annular wall tightly sleeves the front end of the material receiving part of the hollow cylindrical die core 2 and no longer shakes;

[0030] 4. When the blank 99 continues to move, under the action of the punching rod 12, the blank 99, the hollow cylindrical die core 2, the concave spacer block 4, and the hollow annular spacer block 5 are pushed backward to compress the flat wire spiral spring 9 until they contact the fixed tail pad 11 and the movement stops. During the movement, the material receiving part of the hollow cylindrical die core 2 always closely adheres to the riveting wall (annular wall) of the blank 99 and does not rotate steadily, and finally the part is pressed into shape;

[0031] 5. During the processes of the blank 99 entering the die, receiving the material, entering the die, and being pressed into shape, the working steps of 1 to 4 are repeated for continuous and stable material receiving production.

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] 1. The device of the present application can produce continuously in large quantities;

[0034] 2. The device of the present application has higher production efficiency of parts;

[0035] 3. The appearance of the part riveting wall produced by the present application is more beautiful, the quality is more stable, and the enterprise benefit is improved.

[0036] What is disclosed above is only the preferred embodiment of the utility model, but not used to limit itself. Any equivalent changes and modifications made by those skilled in the art without departing from the spirit and connotation of the utility model shall fall within the protection scope of the utility model.

Claims

1. A forming device with a hollow cylindrical core, used for cold heading of nuts with riveted walls, characterized in that: The forming device includes a mold frame, a die body, a hollow cylindrical mold core, a punch rod, a concave pad, a hollow annular pad, a T-shaped hollow pad and a flat helical spring. The die body is arranged in the mold frame, the hollow cylindrical mold core is movably connected to the central through hole of the die body for receiving materials, and the punch rod is movably connected to the central through hole of the hollow cylindrical mold core for upsetting materials; the hollow cylindrical mold core, the concave pad and the hollow annular pad are abutted and connected in sequence; the T-shaped hollow pad is movably connected to the central through hole of the hollow annular pad, and one end of the T-shaped hollow pad includes a radially protruding flange surface; the two ends of the flat helical spring are respectively connected to the hollow annular pad and the flange surface for lifting the hollow cylindrical mold core.

2. The forming device with a hollow cylindrical mold core according to claim 1, characterized in that: The forming device also includes a cylindrical pad and a T-shaped solid pad. The two ends of the cylindrical pad are respectively connected to the punch rod and the T-shaped solid pad for linking the punch rod when subjected to force. A radially protruding connecting surface is provided at one end of the punch rod, and the connecting surface is arranged in the T-shaped hollow pad.

3. The forming device with a hollow cylindrical mold core according to claim 2, characterized in that: The mold frame includes a fixed front seat and a fixed tail pad, the fixed front seat and the fixed tail pad are connected to form a mold cavity, the female mold body is arranged at one end of the fixed front seat, and the fixed tail pad is arranged at the other end of the fixed front seat.

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