Stainless steel cup rim hemming die

Abstract

The utility model discloses a stainless steel cup rim hemming die which comprises an upper die, a lower die and a fixing plate used for fixing the lower die, the lower die comprises a convex punch and a mounting seat, the convex punch protrudes upwards to form a circular truncated cone shape, the mounting seat is used for being connected between the convex punch and the fixing plate, and an arc-shaped ring groove is formed in the position, corresponding to the edge of the lower end of the convex punch, of the mounting seat. The inner side wall of one side of an inner ring of the arc-shaped annular groove is connected with the outer wall of the convex punch, the side, close to the inner ring, of the bottom face of the arc-shaped annular groove is a steep arc face, the side, close to the outer ring, of the bottom face of the arc-shaped annular groove is a slow arc face, and when the upper die and the lower die are in a die assembly state, a stamping gap exists between the lowest end of the upper die and the installation base. By means of the special structural design of the lower die convex punch and the arc-shaped ring groove, curling forming of a stainless steel cup opening is achieved, the structure is simple, production and maintenance cost is reduced, operation is convenient and fast, curling precision is higher, the curling process is stable, the defective rate is low, and production benefits are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of stainless steel cup processing, and particularly relates to a stainless steel cup mouth edge rolling die. BACKGROUND

[0002] In the stainless steel cup manufacturing, the cup mouth edge rolling equipment widely used at present adopts the roller edge rolling technology, is usually composed of multiple rollers and precise transmission components, and during operation, the roller position, angle and pressure and the like parameters need to be finely adjusted, the technical requirement for workers is high, a slight parameter deviation will affect the edge rolling quality, the roller pressure is not uniform, traces are easily left on the cup mouth, the curling curvature and uniformity are difficult to guarantee, the defective product rate is high, and in addition, the complex equipment structure leads to high manufacturing cost, great maintenance difficulty and high production cost of products. UTILITY MODEL CONTENTS

[0003] The utility model aims at the above problems, and provides a stainless steel cup mouth edge rolling die, and solves the problems of high use cost of the existing edge rolling equipment.

[0004] The utility model is realized through the following technical schemes: a stainless steel cup mouth edge rolling die, comprising an upper die, a lower die and a fixing plate for fixing the lower die, the lower die comprises a convex punch head in the shape of a circular truncated cone protruding upward and a mounting seat for connecting the convex punch head and the fixing plate, an arc ring groove is arranged at the lower end edge of the convex punch head on the mounting seat, the inner side wall of the inner ring side of the arc ring groove is connected with the outer wall of the convex punch head, the bottom surface of the arc ring groove is an abrupt arc surface on the side close to the inner ring and is a gentle arc surface on the side close to the outer ring, and a stamping gap exists between the lowermost end of the upper die and the mounting seat in the closed die state.

[0005] Further, an avoidance slope bent in the direction of the ring center is arranged on the upper end of the inner side wall of the arc ring groove, and the inclination angle of the avoidance slope is greater than the inclination angle of the inner side wall.

[0006] Further, a pit recessed downward is arranged at the position of the cup bottom of the stainless steel cup on the top surface of the convex punch head, the upper die comprises a cavity matched with the convex punch head, and a boss matched with the pit is arranged on the bottom surface of the cavity.

[0007] Further, the output end of an oil press or punch is connected to the top end of the upper die, and the depth of the cavity is greater than one-half of the height of the cup body of the stainless steel cup.

[0008] Further, the output end of a pneumatic cylinder is connected to the top end of the upper die, and the depth of the cavity is less than one-half of the height of the cup body of the stainless steel cup.

[0009] Further, the height of the horizontal plane where the top surface of the mounting seat close to the inner ring side of the arc ring groove is located is higher than the height of the horizontal plane where the top surface close to the outer ring side of the arc ring groove is located.

[0010] Further, the radius of the steep arc surface is in the range of 1.3mm-1.5mm, and the radius of the gentle arc surface is in the range of 2.0mm-2.2mm.

[0011] The whole curling process in the utility model is assisted by the power of the upper die pressing down, and curling forming of the stainless steel cup mouth is realized through special structural design of the lower die convex punch and the arc ring groove. Compared with the existing roller curling technology, the utility model has simple structure, reduces production and maintenance cost, and is convenient to operate. Only the cup needs to be inserted into the convex punch in an inverted manner, and the upper die is pressed down to start, the curling precision is higher, the cup mouth curvature and uniformity are consistent, the cup mouth surface is slightly damaged, the appearance is maintained well, one-step forming is realized, multi-step operation is not needed, the process and time are reduced, the curling process is stable, the defective rate is low, and the production benefit is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of each component in an unfolded state in some embodiments of the utility model;

[0013] Figure 2 is Figure 1 an enlarged view of A in

[0014] Figure 3 is a structural schematic diagram of each component in a clamped state in some embodiments of the utility model;

[0015] Figure 4 is a structural schematic diagram of each component in an unfolded state in some other embodiments of the utility model.

[0016] The reference signs are as follows:

[0017] 1, upper die; 11, cavity; 111, boss; 2, lower die; 21, convex punch; 211, pit; 22, mounting seat; 23, arc ring groove; 231, inner side wall; 232, steep arc surface; 233, gentle arc surface; 234, avoidance slope; 3, fixed plate; 4, stamping gap; 5, cup body. DETAILED DESCRIPTION

[0018] The utility model will be further described below in combination with specific examples and drawings.

[0019] Please refer to Figures 1-4The utility model discloses a stainless steel cup mouth curling mould, including upper die 1, lower die 2 and be used for fixing the fixed plate 3 of lower die 2, lower die 2 includes the convex punch 21 of the circular truncated cone that is formed to the upward protruding and is used for the mounting seat 22 between the fixed plate 3 of connecting convex punch 21, the arc ring groove 23 is equipped with in the lower end edge of convex punch 21 of lower die 2 corresponding, the inner side wall 231 of arc ring groove 23 inner ring one side is connected with the outer wall of convex punch 21, the bottom of arc ring groove 23 is close to the one side of inner ring and is steep arc surface 232, is close to the one side of outer ring and is slow arc surface 233, upper die 1 and lower die 2 are in the die closing state, and the lowermost end of upper die 1 exists the stamping gap 4 between mounting seat 22.

[0020] When the operator takes the stainless steel cup to be curled, the cup body 5 is inserted into the convex punch 21 of the lower die 2, at this time, the cup mouth of the stainless steel cup is static at the junction of the inner side wall 231 of the arc ring groove 23 and the steep arc surface 232, the machine is started, the upper die 1 is pressed down, due to the relative movement of the convex punch 21 and the upper die 1, the cup mouth of the stainless steel cup is pressed by the upper die 1, starts to slide along the steep arc surface 232 of the arc ring groove 23, the steep arc surface 232 makes the cup mouth produce preliminary deformation and bending, with the upper die 1 continuing to press down, the cup mouth further slides along the slow arc surface 233, the shape of the slow arc surface 233 guides the cup mouth to gradually curl, finally forms the curling edge meeting the requirements, and the stamping gap 4 exists between the upper die 1 and the mounting seat 22, avoids the upper die 1 from damaging the curling edge shape by pressing down.

[0021] The utility model discloses a stainless steel cup's cup mouth is set first contact steep arc surface 232 again contact slow arc surface 233, due to the rigidity and tenacity of stainless steel material, the steep arc surface 232 of initial stage can concentrate the load of the pressure applied by upper die 1 in a short time, makes the cup mouth obtain greater bending force rapidly, breaks through the initial elastic deformation stage of material, can let the cup mouth determine the preliminary curling direction quickly, again utilizes the gradual change characteristic of slow arc surface 233 can let the cup mouth on the basis of having preliminary bending, along its shape slowly, steadily continues curling, like this can make the curling process of cup mouth more controllable, ensures the curvature of curling edge uniform, thereby guarantees the curling edge quality formed is good.

[0022] The whole curling process is by means of the power of the upper die 1 down pressure, through the special structure design of the convex punch 21 and the arc ring groove 23 of lower die 2, realizes the curling forming of the stainless steel cup mouth, compared with the existing roller curling technology, the utility model structure is simple, reduces the production and maintenance cost, and the operation is convenient, only needs to insert the cup into the convex punch 21 by inverting, starts the upper die 1 down pressure, the curling precision is higher, can ensure that the cup mouth curvature and uniformity are consistent, and the surface damage of cup mouth is small, maintains good appearance, can be formed once, does not need multi-step operation, reduces the procedure and time, and the curling process is stable, the defective rate is low, greatly improves the production efficiency.

[0023] As Figure 2 shown in the utility model, the inner side wall 231 of the arc-shaped ring groove 23 is provided with an avoiding slope 234 which is bent along the center direction of the ring, the inclination angle of the avoiding slope 234 is greater than the inclination angle of the inner side wall 231, so that when the stainless steel cup is inserted into the punch 21 of the lower die 2 upside down, the cup mouth can be smoothly guided to move downwards to be attached to the inner side wall 231, effectively avoiding the edge clamping, and ensuring the stable and accurate placement of the cup mouth.

[0024] As Figure 1 shown in the utility model, the top surface of the punch 21 is provided with a pit 211 which is concave downwards at the position corresponding to the bottom of the stainless steel cup, the upper die 1 comprises a cavity 11 which is arranged in cooperation with the punch 21, the bottom surface of the cavity 11 is provided with a boss 111 which is arranged in cooperation with the pit 211, the pit 211 of the top surface of the punch 21 is in contact with the plate material of the bottom of the stainless steel cup under the pressure action of the boss 111, and the plate material will gradually fill into the pit 211, so that the bottom of the stainless steel cup forms a convex bottom after being punched, and the purpose is to make the stainless steel plate material more uniform in stress during the punching process, reduce the problems such as wrinkling and cracking caused by uneven local stress of the plate material, reduce the probability of generating defective products, and thus improve the production efficiency.

[0025] In some embodiments, as Figures 1-3 shown, the top end of the upper die 1 is connected to the output end of the oil press or punch, and the depth of the cavity 11 is greater than one-half height of the stainless steel cup body 5, generally, the oil press and punch can provide larger pressure and longer stroke, when the depth of the cavity 11 is greater than one-half height of the stainless steel cup body 5, the upper die 1 can fully wrap the larger part of the stainless steel cup body 5 during the descending process, under the action of strong pressure, which helps to apply more uniform and stable pressure to the cup body 5, so that the overall stress of the cup body 5 is balanced during the punching process, especially for the cup mouth edge rolling operation, which can better ensure the quality and shape accuracy of the edge rolling.

[0026] In other embodiments, as Figure 4 shown, if the cup body 5 of the stainless steel cup is relatively thin, the top end of the upper die 1 can also be connected to the output end of the air cylinder, and the depth of the cavity 11 is less than one-half height of the stainless steel cup body 5, because the simple mechanism of the air cylinder generally provides relatively small pressure, the depth of the cavity 11 is designed to be less than one-half height of the stainless steel cup body 5, so that under the condition of limited pressure and stroke of the air cylinder, the contact between the upper die 1 and the stainless steel cup body 5 can focus on effectively punching and forming the shape of the cup bottom part, and it is also convenient for smooth demolding after punching.

[0027] AsFigure 2 As shown, the height of the horizontal plane where the top surface of the mounting seat 22 near the inner ring side of the arc-shaped ring groove 23 is higher than the height of the horizontal plane where the top surface near the outer ring side of the arc-shaped ring groove 23, that is, the mounting seat 22 forms a convex shape with the center being high and the periphery being low with the arc-shaped ring groove 23 as the boundary, and the edge of the convex part is the inner side wall 231 of the arc-shaped ring groove 23. By lifting the height of the center of the mounting seat 22 through the inner side wall 231, on the one hand, it is smooth to connect with the lower end edge of the punch 21, and on the other hand, it is convenient for the cup opening of the stainless steel cup to be clamped into the convex part in the center of the mounting seat 22, so that the overall stability of the stainless steel cup can be maintained during the stamping operation, and the position of the stainless steel cup is prevented from deviating, shaking or tilting during the stamping process, so as to avoid the conditions that affect the product quality and production efficiency, such as the size deviation of the cup opening, the irregular shape and even the failure of the cup edge.

[0028] In some preferred embodiments, please refer to Figure 2 The radius of the arc surface of the steep arc surface 232 is 1.3mm-1.5mm, and the radius of the arc surface of the gentle arc surface 233 is 2.0mm-2.2mm.

[0029] The above embodiments are only the preferred embodiments of the utility model, and are used for explaining the utility model, but not limiting the utility model. Any change, replacement, combination, simplification, modification and the like made by the person skilled in the art without departing from the spirit and essence of the utility model and the principle should be equivalent replacement mode, and should be included in the protection scope of the utility model.

Claims

1. A stainless steel cup neck flanging die characterized by: The application relates to a die set, which comprises an upper die (1), a lower die (2) and a fixing plate (3) for fixing the lower die (2), wherein the lower die (2) comprises a convex punch (21) which is formed in a circular truncated cone shape and protrudes upwards, and a mounting seat (22) for connecting the convex punch (21) and the fixing plate (3), the mounting seat (22) is provided with an arc-shaped ring groove (23) at the lower end edge of the convex punch (21), the inner side wall (231) of the inner ring side of the arc-shaped ring groove (23) is connected with the outer wall of the convex punch (21), the bottom surface of the arc-shaped ring groove (23) is an abrupt arc surface (232) on the inner ring side and is a slow arc surface (233) on the outer ring side, and a stamping gap (4) exists between the lowermost end of the upper die (1) and the mounting seat (22) in the die closing state.

2. The stainless steel cupping and flanging die of claim 1, wherein: The inner side wall (231) of the arc-shaped ring groove (23) is provided with a position-avoiding slope (234) which is bent along the ring center direction at the upper end, and the inclination angle of the position-avoiding slope (234) is larger than that of the inner side wall (231).

3. The stainless steel cupping and flanging die of claim 1, wherein: The top surface of the convex punch (21) is provided with a concave pit (211) which is concave downwards at the position corresponding to the bottom of the stainless steel cup, the upper die (1) comprises a cavity (11) which is arranged in cooperation with the convex punch (21), and the bottom surface of the cavity (11) is provided with a convex platform (111) which is arranged in cooperation with the concave pit (211).

4. The stainless steel cupping and flanging die of claim 3, wherein: The top end of the upper die (1) is connected with the output end of an oil press or a punch, and the depth of the cavity (11) is larger than one-half of the height of the stainless steel cup body (5).

5. The stainless steel cupping and flanging die of claim 3, wherein: The top end of the upper die (1) is connected with the output end of a cylinder, and the depth of the cavity (11) is smaller than one-half of the height of the stainless steel cup body (5).

6. The stainless steel cupping and flanging die of claim 1, wherein: The height of the top surface of the mounting seat (22) on the inner ring side of the arc-shaped ring groove (23) is higher than that of the top surface on the outer ring side of the arc-shaped ring groove (23).

7. The stainless steel cupping and flanging die of claim 1, wherein: The arc surface radius of the abrupt arc surface (232) is in the range of 1.3mm-1.5mm, and the arc surface radius of the slow arc surface (233) is in the range of 2.0mm-2.2mm.

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