Negative-angle forming die for oven shell

Abstract

The utility model discloses an oven shell negative angle forming die which comprises a lower die base, a lower die, a movable bending die and a pressing plate, the lower die base is fixed on a lower die frame, an upper die frame is arranged on the lower die frame, a downward pressing air cylinder is fixed on the upper die frame, a piston rod of the downward pressing air cylinder is connected with an upper pressing die, and the upper pressing die is connected with the lower die. Movable bending dies are hinged to the two sides in a die cavity of the lower die, the two sides of the bottom of the lower die frame are each provided with a spring installation barrel, a bending die rebounding mechanism with one end penetrating through the lower die frame and then abutting against the bottoms of the movable bending dies is arranged in each spring installation barrel, and each bending die rebounding mechanism comprises a jacking rod, a reset spring and an adjusting screw. The jacking rod is matched with the bottom of the movable bending die, the bottom of the jacking rod abuts against one end of the reset spring, the adjusting screw is in threaded connection to the bottom of the spring mounting barrel, the rod body portion of the adjusting screw is rotationally connected with a limiting base, and the limiting base is sleeved with the other end of the reset spring. According to the structure, automatic resetting of the movable bending die is achieved, and the compression force of the spring can be adjusted.

Description

Technical Field

[0001] The utility model belongs to the technical field related to mechanical processing, and particularly relates to a negative angle forming die for an oven shell. Background Art

[0002] Bending is a common processing technology in the sheet metal processing process. In the sheet metal bending process, we usually call the bending angle greater than 90° a negative angle. The negative angle bending die structure of the prior art, such as the patent number 202121784083.X, the patent name is a bending structure for negative angle folding of a mold, the structure comprises a lower die seat, a lower die, a movable bending die and a pressure plate, a guide mechanism is provided at the four corners of the top of the lower die seat, an upper die is provided at the bottom center of the upper die seat, a lower die is provided at the top center of the lower die seat, movable bending dies are provided on both sides of the lower half of the lower die, and a synchronous roller is provided inside the lower die on one side of the movable bending die. The structure realizes the negative angle bending operation through the movable bending die, but the structure is The following problems exist during the operation process: after the movable bending die is pressed down, it cannot automatically rebound and reset, and manual operation is required, which makes the operation inconvenient, and the manual reset is inefficient and inaccurate. Alternatively, a spring is fixed on the side of the movable bending die to reset the movable bending die. However, over time, the spring is easily deformed and affects the rebound force, resulting in unsatisfactory reset of the movable bending die. Therefore, the current movable bending die either has no automatic reset function, or has a poor reset effect after long-term use, so it needs to be improved. Utility Model Content

[0003] The utility model aims to provide a negative angle forming die for an oven shell, which solves the problem that the movable bending die in the existing negative angle die either has no automatic reset function, which makes the automatic reset function impossible to realize, the operation is inconvenient, and the manual reset efficiency is low, or has a fixed reset spring but the reset effect is poor after long-term use.

[0004] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0005] The utility model discloses a negative angle forming die for an oven shell, comprising a lower die seat, a lower die, a movable bending die and a pressing plate, wherein the lower die seat is fixed on a lower die frame, an upper die frame is fixed on the lower die frame, a downward pressure cylinder is fixed on the upper die frame, an upper pressure die located just above a die cavity of the lower die is connected to a piston rod of the downward pressure cylinder, an movable bending die is hinged on both sides of the die cavity of the lower die, a spring mounting cylinder is arranged on both sides of the bottom of the lower die frame, and an end is arranged in each spring mounting cylinder The bending die rebound mechanism penetrates through the lower die frame and then abuts against the bottom of the movable bending die. The bending die rebound mechanism includes a lifting rod, a return spring and an adjusting screw. The upper end of the lifting rod sequentially penetrates through the lower die frame and the lower die base and then cooperates with the bottom of the movable bending die. The bottom of the lifting rod abuts against one end of the return spring. The adjusting screw is threadedly connected to the bottom of the spring mounting cylinder, and the rod body of the adjusting screw is rotatably connected to a limit seat located inside the spring mounting cylinder, and the other end of the return spring is sleeved on the limit seat.

[0006] Preferably, the limit seat includes a base, and a limit ring with a diameter smaller than the base is arranged above the base, one end of the reset spring is sleeved outside the limit ring, and the bottom of the reset spring is against the upper surface of the base, and the bottom of the base is rotatably connected to the rod body of the adjusting screw.

[0007] Preferably, a ring seat with a diameter larger than that of the jacking rod is provided at the bottom of the jacking rod, and a limiting ring 2 with a diameter smaller than that of the ring seat is provided at the bottom of the ring seat, the other end of the reset spring is sleeved outside the limiting ring 2, and the upper part of the reset spring is abutted against the lower surface of the ring seat, and there is a spacing D between the ring seat and the bottom of the lower mold frame, and the spacing D is the upward moving distance of the jacking rod.

[0008] Preferably, the bottom of the spring mounting cylinder is an opening, a screw cap is threadedly connected to the opening, the adjusting screw is threadedly connected to the screw cap, and after the adjusting screw is rotated, the spiral direction of the compressed reset spring is opposite to the tightening direction of the screw cap.

[0009] Preferably, the movable bending die is an L-shaped structure, an arc-shaped bending surface is provided on the inner side of the movable bending die, and the movable bending die is hinged in the lower die cavity through a rotating shaft.

[0010] Preferably, both sides of the bottom of the upper die are arc-surface structures.

[0011] The utility model has the following beneficial effects: the automatic rebound and reset of the movable bending die can be realized through the structural setting, and after long-term use, when the elasticity of the spring weakens, the elastic force of the reset spring can be changed by rotating the adjusting screw below to drive the limit seat to move upward and compress the reset spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a negative angle forming mold for an oven shell in Example 1;

[0013] Figure 2 This is a schematic diagram of the structure of the oven shell that needs to be processed in Example 1;

[0014] Figure 3 for Figure 1 A in the enlarged view;

[0015] Figure 4 for Figure 1 The enlarged view of point B in the figure;

[0016] Figure 5 It is a structural schematic diagram of the limit seat.

[0017] Figure numerals: lower die base 1, lower die 2, movable bending die 3, pressing plate 4, lower die frame 5, upper die frame 6, lower pressing cylinder 7, upper pressing die 8, spring mounting cylinder 9, lifting rod 10, return spring 11, adjusting screw 12, limit seat 13, base 131, limit ring 1 132, ring seat 101, limit ring 2 102, rotary cover 14, arc-shaped bending surface 301, oven shell 15, rotating shaft 16. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example 1

[0020] See also Figure 1-5As shown, a negative angle forming mold for an oven shell disclosed in this embodiment includes a lower mold base 1, a lower mold 2, a movable bending mold 3 and a pressing plate 4, wherein the lower mold base 1 is fixed on a lower mold frame 5, an upper mold frame 6 is fixed on the lower mold frame 5, a downward pressing cylinder 7 is fixed on the upper mold frame 6, an upper pressing mold 8 located just above the mold cavity of the lower mold 2 is connected to the piston rod of the downward pressing cylinder 7, an movable bending mold 3 is hinged on both sides of the mold cavity of the lower mold 2, a spring mounting cylinder 9 is arranged on both sides of the bottom of the lower mold frame 5, and a spring mounting cylinder 9 is arranged in each spring mounting cylinder 9 with one end penetrating through the lower mold cavity. The bending die rebound mechanism that abuts against the bottom of the movable bending die 3 behind the die frame 5 includes a lifting rod 10, a return spring 11, and an adjusting screw 12. The upper end of the lifting rod 10 sequentially passes through the lower die frame 5 and the lower die seat 1 and cooperates with the bottom of the movable bending die 3. The bottom of the lifting rod 10 abuts against one end of the return spring 11. The adjusting screw 12 is threadedly connected to the bottom of the spring mounting cylinder 9, and the rod body of the adjusting screw 12 is rotatably connected to a limit seat 13 located inside the spring mounting cylinder 9. The other end of the return spring 11 is sleeved on the limit seat 13. This embodiment is for performing negative angle bending forming operations on both sides of the oven shell 15.

[0021] After the upper die 13 is lowered, the upper die 13 is lowered to the lower die 2, and the lower die 13 is lowered to the lower die 2.

[0022] Preferably, the limit seat 13 includes a base 131, and a limit ring 132 with a diameter smaller than the base 131 is arranged above the base 131, one end of the reset spring 11 is sleeved outside the limit ring 132, and the bottom of the reset spring 11 is against the upper surface of the base 131, and the bottom of the base 131 is rotatably connected to the rod body of the adjusting screw 12. In this embodiment, the limit seat 13 adopts a structure with a small upper head and a large lower head, which is convenient for positioning the reset spring 11.

[0023] Preferably, a ring seat 101 with a diameter larger than that of the lifting rod 10 is provided at the bottom of the lifting rod 10, and a limiting ring 102 with a diameter smaller than that of the ring seat 101 is provided at the bottom of the ring seat 101, the other end of the reset spring 11 is sleeved outside the limiting ring 102, and the upper part of the reset spring 11 is against the lower surface of the ring seat 101, and there is a spacing D between the ring seat 101 and the bottom of the lower mold frame 5, and the spacing D is the upward movement distance of the lifting rod 10, the bottom of the spring mounting cylinder 9 is an opening, and a screw cover 14 is threadedly connected to the opening, the adjusting screw 12 is threadedly connected to the screw cover 14, and the spiral direction of the compressing reset spring 11 after the adjusting screw 12 is rotated is opposite to the tightening direction of the screw cover 14, in this embodiment, by arranging a detachable screw cover 14 at the bottom of the spring mounting cylinder 9, once the internal reset spring 11 cannot be used, it can be directly replaced with a new spring for use, so as to avoid the spring elasticity weakening and ultimately affecting the rebound reset function of the upper movable bending mold 3.

[0024] Preferably, the movable bending die 3 is an L-shaped structure, and an arc-shaped bending surface 301 is arranged on the inner side of the movable bending die 3. The movable bending die 3 is hinged in the mold cavity of the lower die 2 through a rotating shaft 16. The two sides of the bottom of the upper pressing die 8 are arc surface structures, so as to realize negative angle shaping operation on both sides of the oven shell 15.

[0025] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the aforementioned embodiments and any equivalent replacement of some of the technical features therein, any modification, equivalent replacement, and improvement made are all within the protection scope of the present invention.

Claims

1. A negative angle forming die for an oven shell, comprising a lower die base (1), a lower die (2), a movable bending die (3) and a pressing plate (4), wherein the lower die base (1) is fixed on a lower die frame (5), an upper die frame (6) is fixed on the lower die frame (5), a downward pressure cylinder (7) is fixed on the upper die frame (6), and an upper pressure die (8) located directly above the die cavity of the lower die (2) is connected to the piston rod of the downward pressure cylinder (7), characterized in that: A movable bending die (3) is hinged on both sides of the die cavity of the lower die (2), and a spring mounting cylinder (9) is arranged on both sides of the bottom of the lower die frame (5). A bending die rebound mechanism is arranged in each spring mounting cylinder (9), one end of which passes through the lower die frame (5) and then abuts against the bottom of the movable bending die (3). The bending die rebound mechanism comprises a lifting rod (10), a return spring (11) and an adjusting screw (12). The upper end of the lifting rod (10) passes through the lower die frame (5) and the lower die base (1) in sequence and then cooperates with the bottom of the movable bending die (3). The bottom of the lifting rod (10) abuts against one end of the return spring (11). The adjusting screw (12) is threadedly connected to the bottom of the spring mounting cylinder (9), and the rod body of the adjusting screw (12) is rotatably connected to a limit seat (13) located inside the spring mounting cylinder (9). The other end of the return spring (11) is sleeved on the limit seat (13).

2. The negative angle forming die for an oven shell according to claim 1, characterized in that: The limit seat (13) comprises a base (131), and a limit ring (132) having a diameter smaller than that of the base (131) is arranged above the base (131); one end of the reset spring (11) is sleeved outside the limit ring (132), and the bottom of the reset spring (11) is against the upper surface of the base (131); the bottom of the base (131) is rotatably connected to the rod body of the adjusting screw (12).

3. The negative angle forming die for an oven shell according to claim 1 or 2, characterized in that: A ring seat (101) having a diameter larger than that of the lifting rod (10) is arranged at the bottom of the lifting rod (10), and a second limiting ring (102) having a diameter smaller than that of the ring seat (101) is arranged at the bottom of the ring seat (101); the other end of the reset spring (11) is sleeved outside the second limiting ring (102), and the upper part of the reset spring (11) is against the lower surface of the ring seat (101), and there is a spacing D between the ring seat (101) and the bottom of the lower mold frame (5), and the spacing D is the upward movement distance of the lifting rod (10).

4. The negative angle forming die for an oven shell according to claim 2, characterized in that: The bottom of the spring mounting cylinder (9) is an opening, and a screw cap (14) is threadedly connected to the opening. The adjusting screw (12) is threadedly connected to the screw cap (14), and after the adjusting screw (12) rotates, the spiral direction of the compressed reset spring (11) is opposite to the tightening direction of the screw cap (14).

5. The negative angle forming die for an oven shell according to claim 1, characterized in that: The movable bending die (3) is an L-shaped structure, an arc-shaped bending surface (301) is provided on the inner side of the movable bending die (3), and the movable bending die (3) is hinged in the die cavity of the lower die (2) via a rotating shaft.

6. The negative angle forming die for an oven shell according to claim 1, characterized in that: Both sides of the bottom of the upper pressing die (8) are arc surface structures.

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