Blank holder for controlling feeding of thermal forming part

Abstract

The invention is suitable for the technical field of thermal forming blank holders, and provides a blank holder for controlling thermal forming part feeding, the blank holder comprises a blank holder body, a plurality of grooves are formed in the bottom of the blank holder body, the plurality of grooves are all distributed around the center of the blank holder body, and the blank holder body is arranged in the blank holder body. A plurality of elastic buffering mechanisms are arranged at the top of the blank holder body and used for buffering the blank holder body when the blank holder body extrudes a workpiece. By arranging the buffer mechanism, direct rigid contact between the blank holder body and a workpiece can be avoided through compression of the first spring in the structure, so that the blank holder body can be prevented from being damaged due to reciprocating impact, and the initial elasticity of the first spring can be adjusted according to the strength of the extruded workpiece; therefore, the situation that the friction force between the blank holder body and the workpiece is too large due to the fact that the rigidity of the first spring is too high, and the drawing effect is poor when the workpiece is stamped is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoforming blank holders, and in particular relates to a blank holder for controlling the feeding of thermoforming parts. Background Art

[0002] Deep drawing is an important method of sheet metal forming. The inventors of the present application have found that in the process of deep drawing, when a stamping mechanism is used to stamp a sheet metal to obtain a workpiece structure with a complex shape, there are high requirements for the control of the blank holding force that fixes the edge of the sheet metal. If the blank holding force is too large, it is easy to cause the workpiece to crack. If the blank holding force is too small, the sheet metal will warp and wrinkle. Therefore, providing a blank holding ring between the male and female dies can deal with the two problems of wrinkling the edge of the workpiece and cracking the workpiece.

[0003] Currently, commonly used edge clamping devices are mainly divided into two categories: elastic and rigid. Elastic edge clamping rings include spring edge clamping devices and rubber edge clamping devices. Elastic edge clamping devices cannot achieve an ideal state in controlling the edge clamping force. Summary of the invention

[0004] The present invention provides a blank holder ring for controlling the feeding of thermoformed parts, aiming to solve the problem that the existing elastic blank holder ring mentioned in the above background technology includes a spring blank holder device and a rubber blank holder device, and the elastic blank holder device cannot achieve an ideal state in controlling the blank holder force.

[0005] The present invention is implemented as follows: a blank holder ring for controlling the feeding of a hot-formed part comprises a blank holder ring body, a groove is provided at the bottom of the blank holder ring body, the number of the grooves is set to be multiple, and the multiple grooves are distributed around the center of the blank holder ring body, and a plurality of elastic buffer mechanisms are provided on the top of the blank holder ring body, and the elastic buffer mechanisms are used to buffer the blank holder ring body when the blank holder ring body squeezes the workpiece;

[0006] A rolling mechanism is provided inside the groove, and the rolling mechanism is used to convert the sliding friction between the bottom of the pressure ring body and the workpiece into a rolling friction.

[0007] Preferably, the elastic buffer mechanism includes a first mounting member, the bottom of the first mounting member is fixedly connected to the blank holder body, the top of the first mounting member is provided with a second mounting member, two fixing rods are fixedly connected between the first mounting member and the second mounting member, a push rod is slidably connected to the middle of the second mounting member, a push plate is fixedly connected to the bottom of the push rod, a first spring is provided at the bottom of the push plate, and a first adjustment structure is provided at the bottom of the first spring;

[0008] By pressing the push rod, the blank holder body can be driven to move downward. After the blank holder body abuts against the workpiece, continuing to press the push rod can squeeze the first spring through the push plate at the bottom of the push rod, thereby avoiding direct rigid contact between the blank holder body and the workpiece through the compression of the first spring, thereby avoiding damage to the blank holder body due to reciprocating impact.

[0009] Preferably, the first adjustment structure comprises a positioning slot, a moving member and a limiting slot, the number of the positioning slots is set to two, and the two positioning slots are respectively arranged through two fixing rods;

[0010] The number of the limiting grooves is set to two, and the two limiting grooves are respectively opened on the surfaces of the two fixing rods;

[0011] The movable member is arranged between the two fixed rods, the movable member is slidably connected to the two fixed rods, both sides of the movable member are fixedly connected with positioning blocks, and the two positioning blocks are slidably connected to the two positioning grooves respectively;

[0012] A first threaded rod is fixedly connected to the bottom of the moving member, an annular knob is threadedly connected to the outer circumference of the first threaded rod, and two sides of the annular knob are matched with two limit grooves respectively;

[0013] By rotating the annular knob, the first threaded rod threadably connected thereto can be driven to move along the axis direction of the first threaded rod, and at the same time the first threaded rod will drive the moving part to move synchronously. By rotating the annular knob forward or reversely, the position of the moving block can be adjusted to adjust the compression degree of the first spring, thereby adjusting the initial elastic force of the first spring, and then the initial elasticity of the first spring can be adjusted according to the strength of the extruded workpiece, thereby avoiding excessive friction between the blank holder body and the workpiece due to excessive rigidity of the first spring, thereby resulting in poor drawing effect when stamping the workpiece.

[0014] Preferably, the rolling mechanism comprises a rotating roller and a sliding groove, both ends of the rotating roller are rotatably connected to the groove, and the number of the rotating rollers is set to two;

[0015] The number of the slide grooves is set to two, the two slide grooves are both opened at the top of the groove, the slide grooves are connected to the groove, a slide rod is slidably arranged inside the two slide grooves, a second spring is arranged on the top of the two slide rods, and the bottom of the two slide rods is fixedly connected to the same friction block, and the friction block matches the two rotating rollers;

[0016] A second adjustment structure is provided on the top of the friction block;

[0017] The blank holder body contacts the workpiece through the rotating roller at the bottom, which can convert the sliding friction between the bottom of the blank holder ring and the workpiece into the rotational friction between the rotating rollers, thereby reducing the friction between the blank holder body and the workpiece, thereby avoiding excessive friction between the blank holder body and the workpiece, thereby affecting the drawing effect when the workpiece is stamped.

[0018] Preferably, the second adjustment structure comprises a receiving groove, the bottom of which is connected to the two sliding grooves, a movable plate is slidably arranged inside the receiving groove, the bottom of the movable plate is abutted against two second springs, a second threaded rod is rotatably arranged on the top of the movable plate, the middle part of the second threaded rod is threadedly connected to the blank holder body, and an adjustment knob is fixedly connected to the top of the second threaded rod;

[0019] The second threaded rod can be driven to rotate by rotating the adjusting knob, and the second threaded rod can drive the movable plate to slide in the accommodating groove, so that the compression degree of the second spring can be adjusted by the movable plate, and the second spring will squeeze the sliding rod at the bottom, and the sliding rod will drive the friction block to resist the multiple rotating rollers. Therefore, by adjusting the compression degree of the second spring, the rolling friction force of the multiple rotating rollers can be adjusted, thereby improving the application range of the device.

[0020] Preferably, the surface of the fixing rod is provided with scale lines, and the end of the positioning block is provided with a pointer, and the pointer matches the scale lines;

[0021] By observing the position of the pointer on the scale line, the position of the moving block can be known, and then the compression degree of the first spring can be known, so that the elastic force of the first spring can be accurately adjusted.

[0022] Preferably, a reinforcing rod is fixedly connected to the outer periphery of the blank holder body, and the number of the reinforcing rods is set to be multiple;

[0023] The structural strength of the blank holder body can be improved by providing a reinforcing rod.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: a blank holder ring for controlling the feeding of a hot-formed part of the present invention:

[0025] 1. By setting up a buffer mechanism, the compression of the first spring in the structure can avoid direct rigid contact between the blank holder body and the workpiece, thereby preventing the blank holder body from being damaged due to reciprocating impact, and the initial elasticity of the first spring can be adjusted according to the strength of the workpiece being squeezed, thereby avoiding excessive friction between the blank holder body and the workpiece due to excessive rigidity of the first spring, thereby preventing poor drawing effect during workpiece stamping.

[0026] 2. By setting up a rolling mechanism, the sliding friction between the bottom of the blank holder and the workpiece can be converted into the rotational friction between the rotating rollers, thereby reducing the friction between the blank holder body and the workpiece, and further avoiding excessive friction between the blank holder body and the workpiece, thereby affecting the drawing effect during stamping of the workpiece. By adjusting the compression degree of the second spring, the rolling friction of multiple rotating rollers can be adjusted, thereby improving the application range of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a partial structural cross-sectional view of the present invention;

[0029] Figure 3 It is a schematic diagram of the elastic buffer mechanism of the present invention;

[0030] Figure 4 It is a schematic diagram of the fixing rod structure of the present invention;

[0031] Figure 5 For the present invention Figure 2 A magnified view of the structure of part A;

[0032] Figure 6 For the present invention Figure 3 Enlarged view of the structure of part B.

[0033] In the figure:

[0034] 1. Blank holder body; 11. Groove;

[0035] 2. elastic buffer mechanism; 21. first mounting member; 22. second mounting member; 23. fixing rod; 24. stop rod; 25. stop plate; 26. first spring; 27. first adjustment structure;

[0036] 271, positioning groove; 272, moving member; 273, limiting groove; 274, positioning block; 275, first threaded rod; 276, annular knob;

[0037] 3. rolling mechanism; 31. rotating roller; 32. slide groove; 33. slide rod; 34. second spring; 35. friction block; 36. second adjustment structure;

[0038] 361, receiving groove; 362, moving plate; 363, second threaded rod; 364, adjusting knob;

[0039] 4. Scale line; 5. Pointer; 6. Reinforcement rod. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0041] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0042] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figure 1-6 The present invention provides a technical solution: a blank holder ring for controlling the feeding of hot-formed parts, comprising a blank holder ring body 1, a groove 11 is provided at the bottom of the blank holder ring body 1, the number of the grooves 11 is set to be multiple, and the multiple grooves 11 are distributed around the center of the blank holder ring body 1, and a plurality of elastic buffer mechanisms 2 are provided on the top of the blank holder ring body 1, and the elastic buffer mechanism 2 is used to buffer the blank holder ring body 1 when the blank holder ring body 1 extrude the workpiece;

[0046] A rolling mechanism 3 is provided inside the groove 11 , and the rolling mechanism 3 is used to convert the sliding friction between the bottom of the blank holder body 1 and the workpiece into a rolling friction.

[0047] Furthermore, the elastic buffer mechanism 2 includes a first mounting member 21, the bottom of the first mounting member 21 is fixedly connected to the pressure ring body 1, the top of the first mounting member 21 is provided with a second mounting member 22, two fixed rods 23 are fixedly connected between the first mounting member 21 and the second mounting member 22, a push rod 24 is slidably connected to the middle part of the second mounting member 22, a push plate 25 is fixedly connected to the bottom of the push rod 24, a first spring 26 is provided at the bottom of the push plate 25, and a first adjustment structure 27 is provided at the bottom of the first spring 26.

[0048] Further, the first adjustment structure 27 includes a positioning groove 271, a moving member 272 and a limiting groove 273. The number of the positioning grooves 271 is set to two, and the two positioning grooves 271 are respectively set through the two fixing rods 23;

[0049] The number of the limiting grooves 273 is set to two, and the two limiting grooves 273 are respectively opened on the surfaces of the two fixing rods 23;

[0050] The moving member 272 is disposed between the two fixed rods 23, and the moving member 272 is slidably connected to the two fixed rods 23. Positioning blocks 274 are fixedly connected to both sides of the moving member 272, and the two positioning blocks 274 are slidably connected to the two positioning grooves 271 respectively.

[0051] A first threaded rod 275 is fixedly connected to the bottom of the moving member 272 . An annular knob 276 is threadedly connected to the outer periphery of the first threaded rod 275 . Two sides of the annular knob 276 are matched with the two limiting grooves 273 respectively.

[0052] Further, the rolling mechanism 3 includes a rotating roller 31 and a sliding groove 32. Both ends of the rotating roller 31 are rotatably connected to the groove 11. The number of the rotating rollers 31 is set to two.

[0053] The number of the slide grooves 32 is set to two, and the two slide grooves 32 are both opened at the top of the groove 11, and the slide grooves 32 are connected to the groove 11. The two slide grooves 32 are slidably provided with slide rods 33 inside, and the tops of the two slide rods 33 are provided with second springs 34. The bottoms of the two slide rods 33 are fixedly connected with the same friction block 35, and the friction block 35 matches the two rotating rollers 31;

[0054] A second adjustment structure 36 is provided on the top of the friction block 35 .

[0055] Furthermore, the second adjustment structure 36 includes a receiving groove 361, the bottom of which is connected to the two sliding grooves 32, a movable plate 362 is slidably arranged inside the receiving groove 361, the bottom of the movable plate 362 is against the two second springs 34, a second threaded rod 363 is rotatably arranged on the top of the movable plate 362, the middle part of the second threaded rod 363 is threadedly connected to the pressure ring body 1, and an adjustment knob 364 is fixedly connected to the top of the second threaded rod 363.

[0056] Furthermore, a scale line 4 is provided on the surface of the fixing rod 23 , and a pointer 5 is provided at the end of the positioning block 274 , and the pointer 5 matches the scale line 4 .

[0057] Furthermore, a reinforcing rod 6 is fixedly connected to the outer periphery of the blank holder body 1 , and the number of the reinforcing rod 6 is set to be multiple.

[0058] The working principle and use process of the present invention:

[0059] The blank holder body 1 can be driven to move downward by pressing the push rod 24. When the blank holder body 1 abuts against the workpiece, continuing to press the push rod 24 can squeeze the first spring 26 through the push plate 25 at the bottom of the push rod 24, thereby avoiding direct rigid contact between the blank holder body 1 and the workpiece through the compression of the first spring 26, thereby avoiding damage to the blank holder body 1 due to reciprocating impact.

[0060] By rotating the annular knob 276, the first threaded rod 275 threadedly connected thereto can be driven to move along the axis direction of the first threaded rod 275, and at the same time, the first threaded rod 275 will drive the moving member 272 to move synchronously, and by rotating the annular knob 276 forward or reversely, the compression degree of the first spring 26 can be adjusted by adjusting the position of the moving block, thereby adjusting the initial elastic force of the first spring 26, and then the initial elasticity of the first spring 26 can be adjusted according to the strength of the workpiece being squeezed, thereby avoiding excessive friction between the blank holder body 1 and the workpiece due to excessive rigidity of the first spring 26, thereby resulting in poor drawing effect during workpiece stamping;

[0061] The blank holder body 1 contacts the workpiece through the rotating roller 31 at the bottom, and the sliding friction between the bottom of the blank holder and the workpiece can be converted into the rotating friction between the rotating rollers 31, thereby reducing the friction between the blank holder body 1 and the workpiece, thereby avoiding excessive friction between the blank holder body 1 and the workpiece, thereby affecting the drawing effect of the workpiece during stamping;

[0062] By rotating the adjusting knob 364, the second threaded rod 363 can be driven to rotate, and at the same time, the second threaded rod 363 can drive the movable plate 362 to slide in the accommodating groove 361, so that the compression degree of the second spring 34 can be adjusted by the movable plate 362, and the second spring 34 will squeeze the sliding rod 33 at the bottom, and at the same time, the sliding rod 33 will drive the friction block 35 to resist against the multiple rotating rollers 31. Therefore, by adjusting the compression degree of the second spring 34, the rolling friction force of the multiple rotating rollers 31 can be adjusted, thereby improving the application range of the device.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blank holder for controlling the feeding of a thermoformed part, comprising a blank holder body (1), characterized in that: A groove (11) is provided at the bottom of the blank holder body (1), the number of the grooves (11) is set to be multiple, and the multiple grooves (11) are distributed around the center of the blank holder body (1), and a plurality of elastic buffer mechanisms (2) are provided at the top of the blank holder body (1), and the elastic buffer mechanisms (2) are used to buffer the blank holder body (1) when the blank holder body (1) extrude the workpiece; A rolling mechanism (3) is provided inside the groove (11), and the rolling mechanism (3) is used to convert the sliding friction force between the bottom of the blank holder body (1) and the workpiece into a rolling friction force.

2. A blank holder for controlling the feeding of hot-formed parts according to claim 1, characterized in that: The elastic buffer mechanism (2) comprises a first mounting member (21), the bottom of the first mounting member (21) is fixedly connected to the pressure ring body (1), the top of the first mounting member (21) is provided with a second mounting member (22), two fixing rods (23) are fixedly connected between the first mounting member (21) and the second mounting member (22), a push rod (24) is slidably connected to the middle of the second mounting member (22), the bottom of the push rod (24) is fixedly connected to a push plate (25), the bottom of the push plate (25) is provided with a first spring (26), and the bottom of the first spring (26) is provided with a first adjustment structure (27).

3. A blank holder for controlling the feeding of hot-formed parts as claimed in claim 2, characterized in that: The first adjustment structure (27) comprises a positioning groove (271), a moving member (272) and a limiting groove (273); the number of the positioning grooves (271) is set to two, and the two positioning grooves (271) are respectively arranged to penetrate the two fixing rods (23); The number of the limiting grooves (273) is set to two, and the two limiting grooves (273) are respectively opened on the surfaces of the two fixing rods (23); The movable member (272) is arranged between the two fixed rods (23), the movable member (272) is slidably connected to the two fixed rods (23), both sides of the movable member (272) are fixedly connected with positioning blocks (274), and the two positioning blocks (274) are respectively slidably connected to the two positioning grooves (271); A first threaded rod (275) is fixedly connected to the bottom of the moving member (272), and an annular knob (276) is threadedly connected to the outer periphery of the first threaded rod (275), and two sides of the annular knob (276) are respectively matched with two limiting grooves (273).

4. A blank holder for controlling the feeding of hot-formed parts according to claim 1, characterized in that: The rolling mechanism (3) comprises a rotating roller (31) and a sliding groove (32), both ends of the rotating roller (31) are rotatably connected to the groove (11), and the number of the rotating rollers (31) is set to two; The number of the slide grooves (32) is set to two, the two slide grooves (32) are both opened at the top of the groove (11), the slide grooves (32) are connected to the groove (11), a slide rod (33) is slidably arranged inside the two slide grooves (32), a second spring (34) is arranged on the top of the two slide rods (33), and the bottom of the two slide rods (33) is fixedly connected with the same friction block (35), and the friction block (35) matches the two rotating rollers (31); A second adjustment structure (36) is provided on the top of the friction block (35).

5. A blank holder for controlling the feeding of hot-formed parts as claimed in claim 4, characterized in that: The second adjustment structure (36) includes a receiving groove (361), the bottom of which is connected to the two sliding grooves (32), a movable plate (362) is slidably arranged inside the receiving groove (361), the bottom of the movable plate (362) is against the two second springs (34), a second threaded rod (363) is rotatably arranged on the top of the movable plate (362), the middle part of the second threaded rod (363) is threadedly connected to the pressure ring body (1), and an adjustment knob (364) is fixedly connected to the top of the second threaded rod (363).

6. A blank holder for controlling the feeding of hot-formed parts as claimed in claim 3, characterized in that: The surface of the fixing rod (23) is provided with a scale line (4), and the end of the positioning block (274) is provided with a pointer (5), and the pointer (5) matches the scale line (4).

7. A blank holder for controlling the feeding of hot-formed parts according to claim 1, characterized in that: A reinforcing rod (6) is fixedly connected to the outer periphery of the pressure ring body (1), and the number of the reinforcing rods (6) is set to be multiple.

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