Non-Newtonian fluid deep drawing die

Abstract

The utility model discloses a non-Newtonian fluid deep drawing die, and belongs to the technical field of die manufacturing and metal forging. The deep drawing die comprises an upper rubber die, a clamp and a non-Newtonian fluid box which are used for clamping a workpiece to be machined, and a multi-contact die head, a positioning rod, a positioning spring, a positioning plate and non-Newtonian fluid which are located in the non-Newtonian fluid box. A plurality of mold units are arranged on the positioning plate, and one mold unit is formed by one multi-contact mold head and the positioning rod and the positioning spring which are correspondingly connected with the multi-contact mold head; a cavity of the non-Newtonian fluid box is filled with non-Newtonian fluid, the lower portion of the bottom of the multi-contact die head is located in the non-Newtonian fluid, the upper portion of the multi-contact die head is in contact connection with a machined part, and an upper rubber die for forging and pressing the machined part is arranged over the machined part. According to the deep drawing die, the shape of the die can be adjusted at any time according to different shapes, small-batch production is achieved with low cost and high efficiency, and the production process is more stable and more continuous.

Description

Technical Field

[0001] The utility model relates to a metal drawing die, in particular to a non-Newtonian fluid drawing die, and belongs to the technical fields of die manufacturing and metal forging. Background Art

[0002] Traditional drawing processes require the production of dies. Since the manufacturing cost of traditional dies is high, the die cost can only be amortized through large-scale production. Therefore, traditional drawing processes are not suitable for small-batch products. Taking the production of silver jewelry as an example, the existing forming technologies are mainly casting and engraving, which are inefficient and costly. The reason for not adopting forging forming is that traditional forging forming can only amortize the die cost through large-scale production and cannot meet the personalized requirements of jewelry products.

[0003] For example, the invention patent with the authorization announcement number CN110216184B discloses a door body forming machine. In this forming machine, a non-Newtonian fluid is filled into a flexible accommodation bag as the forging contact surface, so that the surface formability of the obtained product is better. However, it still has the following two disadvantages: 1) The length (forming column) of the rigid forming part needs to be processed separately and can only be replaced, not adjusted; 2) After the non-Newtonian body is stressed in the flexible bag, it will be affected by the deformation of the bag, and there may be unpredictable and undesired hardening; at the same time, because the non-Newtonian fluid cannot be stirred in real time in the bag, the precipitation problem of some non-Newtonian bodies cannot be solved, thus affecting the production stability.

[0004] Therefore, there is an urgent need to design a drawing die based on non-Newtonian fluid, which can achieve the stability and continuity of small-batch products. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems of non-adjustability of the processing rod and overly complex stress of the non-Newtonian fluid caused by the deformation of the bag in the existing non-Newtonian fluid application technology, and provide a non-Newtonian fluid drawing die, which can adjust the shape of the die at any time according to different shapes, realize small-batch production with low cost and high efficiency, and its production process is more stable and continuous.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions: a non-Newtonian fluid drawing die, comprising a rubber upper die, a fixture for clamping a workpiece to be processed, and a non-Newtonian fluid tank fixed on the workbench of a forging device;

[0007] A positioning plate is arranged in the middle of the cavity of the non-Newtonian fluid tank. The positioning plate is composed of two side support plates fixedly connected to the bottom of the cavity and two layers of flat plates that are parallel to each other and are evenly distributed with a plurality of coaxially penetrating holes; a multi-contact die head is arranged in the upper part of the cavity of the non-Newtonian fluid tank. A positioning rod is fixedly connected to the lower part of the multi-contact die head. The other end of the positioning rod is correspondingly arranged in the penetrating holes of the two layers of flat plates and is fixed on the positioning plate. A positioning spring is also sleeved on the positioning rod between the multi-contact die head and the upper layer of the flat plate of the positioning plate. A multi-contact die head and the corresponding positioning rod and positioning spring together constitute a die unit;

[0008] The cavity of the non-Newtonian fluid tank is filled with non-Newtonian fluid. Below the bottom of the multi-contact die head is located in the non-Newtonian fluid. The upper part of the multi-contact die head is in contact connection with the workpiece to be processed clamped by a fixture. A rubber upper die for forging the workpiece is arranged directly above the workpiece.

[0009] External threads are arranged on the lower outer edge of the positioning rod. A positioning rod nut is correspondingly arranged below the lower layer of the flat plate of the positioning plate. The positioning rod is fixedly connected to the positioning plate through the threaded fit between the external threads of the positioning rod and the internal threads of the positioning rod nut.

[0010] The penetrating holes on the two layers of flat plates of the positioning plate are coaxial circular holes, and a plurality of evenly distributed coaxial circular holes are arranged in a square array on the horizontal plane.

[0011] A stirring hole is arranged at the bottom of the non-Newtonian fluid tank. An L-shaped stirring rod is rotatably connected in the stirring hole.

[0012] A sealing ring is also used for sealing connection between the stirring hole at the bottom of the non-Newtonian fluid tank and the stirring rod.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1) The drawing die of the present utility model can adjust the shape of the die at any time according to different shapes, realize small-batch production with low cost and high efficiency, and its production process is more stable and continuous.

[0015] 2) The present utility model utilizes the resistance generated by the mechanical characteristic that the non-Newtonian fluid becomes solid instantly under rapid impact to process the workpiece. By adopting the threaded fixing method between the multi-contact die head and the positioning plate, the height of each die unit can be adjusted by using the positioning spring and the positioning nut to obtain the required die shape, so that the product shape obtained has stability and unity; at the same time, the precipitation problem of the non-Newtonian fluid is solved through the stirring device, ensuring the continuity of the production process. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the non-Newtonian fluid drawing die of the present utility model.

[0017] In the figure, 1 is the upper rubber die, 2 is the workpiece to be processed, 3 is the fixture, 4 is the multi-contact die head, 5 is the non-Newtonian fluid, 6 is the positioning spring, 7 is the non-Newtonian fluid tank, 8 is the positioning rod, 9 is the positioning plate, 10 is the positioning rod nut, 11 is the positioning rod thread, 12 is the stirring rod, and 13 is the sealing ring. Specific embodiments

[0018] The present utility model will be further explained and described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Embodiment: As Figure 1 shown, the present utility model provides a non-Newtonian fluid drawing die, which includes an upper rubber die 1, a fixture 3 for clamping the workpiece to be processed 2, a non-Newtonian fluid tank 7 fixed on the working table of the forging equipment, and a multi-contact die head 4, a positioning rod 8, a positioning spring 6, a positioning plate 9 and a non-Newtonian fluid 5 arranged in the non-Newtonian fluid tank 7; a plurality of die units are provided on the positioning plate 9, and a multi-contact die head 4 and the corresponding positioning rod 8 and positioning spring 6 connected thereto together form a die unit.

[0020] The positioning plate 9 is installed in the middle of the cavity of the non-Newtonian fluid tank 7, and the positioning plate 9 is composed of two side support plates fixedly connected to the bottom of the cavity and two layers of flat plates that are parallel to each other and are evenly distributed with a plurality of coaxial through holes; the through holes on the two layers of flat plates of the positioning plate 9 are coaxial circular holes, and the plurality of evenly distributed coaxial circular holes are arranged in a square array on the horizontal plane; the die is composed of a plurality of die units arranged in a square array, and the required die shape can be obtained by adjusting the height of each unit.

[0021] The multi-contact die head 4 is arranged in the upper part of the cavity of the non-Newtonian fluid tank 7, the lower part of the multi-contact die head 4 is fixedly connected with a positioning rod 8, the other end of the positioning rod 8 is correspondingly installed in the through holes of the two layers of flat plates and fixed on the positioning plate 9, and a positioning spring 6 is also sleeved on the positioning rod 8 between the multi-contact die head 4 and the upper layer of the positioning plate 9.

[0022] The outer edge of the lower part of the positioning rod 8 is provided with a positioning rod thread 11, the lower part of the lower layer of the positioning plate 9 is correspondingly installed with a positioning rod nut 10, and the positioning rod 8 is fixedly connected to the positioning plate 9 through the thread fit of the positioning rod thread 11 and the positioning rod nut 10.

[0023] A stirring hole is opened at the bottom of the non-Newtonian fluid tank 7, and an L-shaped stirring rod 12 is rotatably connected in the stirring hole; the stirring device is used to stir the non-Newtonian fluid to prevent it from precipitating. A sealing connection is also provided between the stirring hole at the bottom of the non-Newtonian fluid tank 7 and the stirring rod 12 through a sealing ring 13.

[0024] The cavity of the non-Newtonian fluid tank 7 is filled with a non-Newtonian fluid 5. When the non-Newtonian fluid 5 is rapidly impacted, it quickly turns into a solid state, preventing an object from moving at high speed inside it. The non-Newtonian fluid 5 has very little resistance to an object moving at low speed inside it. Below the bottom of the multi-contact die head 4 is located within the non-Newtonian fluid 5. The upper part of the multi-contact die head 4 is in contact connection with the workpiece 2 clamped by the fixture 3. Above the workpiece 2 is arranged a rubber upper die 1 for forging it.

[0025] A method for using a non-Newtonian fluid drawing die includes the following steps:

[0026] S1. Adjust each die unit on the positioning plate 9, loosen the corresponding positioning nut 10 thereon, and raise the multi-contact die head 4 of each die unit to the highest position.

[0027] S2. Place the die pattern above the die adjusted in step S1 and press down on the die to move the die unit downward and obtain the desired shape.

[0028] S3. Identify all die units that have moved downward due to the operation in step S2, and rotate the corresponding positioning nut 10 to fix the die unit on the positioning plate 9 of the die unit.

[0029] S4. Remove the die pattern and fix the positioning plate 9 with the die unit fixed in step S3 on the bottom plate of the non-Newtonian fluid tank 7.

[0030] S5. Inject the non-Newtonian fluid 5 into the non-Newtonian fluid tank 7 in step S4. A low-speed stirring device for preventing the non-Newtonian fluid 5 from precipitating is provided at the bottom of the non-Newtonian fluid tank 7. Start the stirring rod 12 when the non-Newtonian fluid 5 precipitates, and stop stirring after the non-Newtonian fluid 5 is stirred evenly.

[0031] S6. Fix the non-Newtonian fluid tank 7 in step S5 on the workbench of the forging equipment.

[0032] S7. Use the fixture 3 to fix the workpiece 2 above the die fixed in step S6, and arrange a rubber upper die 1 for stamping above the die.

[0033] S8. Start the stamping equipment. The rubber upper die 1 rapidly impacts the workpiece 2 fixed in step S7, causing the workpiece 2 to be drawn and deformed downward and then rapidly impact the die fixed on the positioning plate 9, and collide quickly with the first contacted die unit.

[0034] S9. In step S8, the first impacted die unit has a tendency to move rapidly downward, causing the non-Newtonian fluid around it to solidify and generate a large resistance, preventing the die unit from continuing to move downward.

[0035] S10. The die unit that is blocked from moving downward by the non-Newtonian fluid in step S9 blocks the downward deformation of the workpiece 2, and the part of the workpiece 2 that does not contact the die unit continues to deform downward.

[0036] S11. The processing process that occurs to the workpiece 2 in the above steps generates controllable deformation. By using different dies and repeating the above steps, the purpose of processing different workpieces is achieved.

[0037] Working principle:

[0038] By adjusting the nuts of each positioning rod 10, the height of the multi-contact die head 4 is controlled, and the multi-contact die head 4 is adjusted into the required lower die. The sheet-shaped workpiece 2 is fixed on the upper part of the multi-contact die head 4 by the fixture 3, and the rubber upper die 1 is used to pound the workpiece 2 downward.

[0039] The workpiece 2 collides with the relatively prominent multi-contact die head 4 and causes it to be quickly compressed downward. The compression action impacts the non-Newtonian fluid 5. The non-Newtonian fluid 5 instantaneously becomes solid when impacted, generating a resistance force that prevents the die head from continuing to move downward and generates an upward reaction force on the workpiece 2. At this time, the sheet-shaped workpiece 2 above the relatively low die head is impacted by the rubber upper die 1 but is not supported by the lower die and deforms downward to produce a drawing.

[0040] After the impact stops, the non-Newtonian fluid 5 resumes its fluidity, and the die head slowly returns to its original position under the action of the positioning spring 6. Then, the above actions are repeated until the shape of the workpiece 2 meets the requirements.

[0041] The utility model utilizes the resistance generated by the mechanical characteristic that the non-Newtonian fluid instantaneously becomes solid when it is quickly impacted to process the workpiece. By adopting the threaded fixing method between the multi-contact die head and the positioning plate, the height of each die unit can be adjusted by using the positioning spring and the positioning nut to obtain the required die shape, so that the product shape obtained has stability and uniformity; at the same time, the precipitation problem of the non-Newtonian fluid is solved by the stirring device, ensuring the continuity of the production process.

[0042] The above is only used to illustrate the technical solution of the utility model and not to limit it. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the utility model should be covered within the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A non-Newtonian fluid deep drawing die, characterized in that: It includes a rubber upper die (1), a fixture (3) for clamping the workpiece to be processed (2), and a non-Newtonian fluid tank (7) fixed on the workbench of the forging equipment; A positioning plate (9) is arranged in the middle of the cavity of the non-Newtonian fluid tank (7). The positioning plate (9) is composed of two side support plates fixedly connected to the bottom of the cavity and two layers of flat plates that are parallel to each other and evenly distributed with a plurality of coaxial through holes. A multi-contact die head (4) is arranged in the upper part of the cavity of the non-Newtonian fluid tank (7). A positioning rod (8) is fixedly connected to the lower part of the multi-contact die head (4). The other end of the positioning rod (8) is correspondingly arranged in the through holes of the two layers of flat plates and fixed on the positioning plate (9). A positioning spring (6) is also sleeved on the positioning rod (8) between the upper layer flat plate of the multi-contact die head (4) and the positioning plate (9). A multi-contact die head (4) and the corresponding positioning rod (8) and positioning spring (6) together constitute a die unit; The cavity of the non-Newtonian fluid tank (7) is filled with non-Newtonian fluid (5). The part below the bottom of the multi-contact die head (4) is located in the non-Newtonian fluid (5). The upper part of the multi-contact die head (4) is in contact connection with the workpiece to be processed (2) clamped by the fixture (3). A rubber upper die (1) for forging the workpiece to be processed (2) is arranged directly above the workpiece to be processed (2); A stirring hole is arranged at the bottom of the non-Newtonian fluid tank (7), and an L-shaped stirring rod (12) is rotatably connected in the stirring hole.

2. The non-Newtonian fluid deep drawing die according to claim 1, characterized in that: A positioning rod thread (11) is arranged on the outer edge of the lower part of the positioning rod (8), and a positioning rod nut (10) is correspondingly arranged below the lower layer flat plate of the positioning plate (9). The positioning rod (8) is fixedly connected to the positioning plate (9) through the thread fit of the positioning rod thread (11) and the positioning rod nut (10).

3. The non-Newtonian fluid deep drawing die according to claim 1, characterized in that: The through holes on the two layers of flat plates of the positioning plate (9) are coaxial circular holes, and the plurality of evenly distributed coaxial circular holes are arranged in a square array on the horizontal plane.

4. A non-Newtonian fluid deep drawing die according to claim 1, characterized in that: A sealing ring (13) is also used for sealing connection between the stirring hole at the bottom of the non-Newtonian fluid tank (7) and the stirring rod (12).

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