Large-stroke punch forming die structure for edge rolling stamping part and forming method

Abstract

The large-stroke punch forming die structure comprises an upper die base, an upper padding plate, an upper clamping plate, a stripping back plate, a stripping plate, a lower die plate, a lower padding plate and a lower die base which are sequentially arranged from top to bottom, a stripping insert core is arranged on the stripping plate, a lower die insert core is arranged on the lower die plate, an air cylinder is arranged on the lower die base, and the air cylinder is arranged on the lower die base. The piston rod end of the air cylinder is connected with a dowel bar which is connected with a sliding block, and the sliding block is connected with a forming inner core. The invention further discloses a large-stroke stamping forming method for the edge rolling stamping part. The large-stroke stamping forming method comprises the steps that the two opposite edges of a material are bent; bending the middle of the material; the bent material is wrapped by the stripping insert core and the lower die insert core to form the edge rolling stamping part; the forming inner core is inserted into the edge rolling stamping part to shape the roundness of the edge rolling stamping part; the forming inner core retreats from the edge rolling stamping part; and the feeding mechanism starts feeding. The forming and roundness shaping device has the beneficial effects that the forming and roundness shaping speed of the edge rolling stamping part is high, the efficiency is high, the production cost is low, and the product quality is high.

Description

Technical Field

[0001] The invention relates to the technical field of curling and forming, and in particular to a large-stroke stamping and forming die structure and a forming method for curling stamping parts. Background Art

[0002] In the structural design of precision progressive stamping dies, the field of continuous stamping is a new breakthrough and its application has been greatly improved.

[0003] like Figure 1 The figure shows the structure of a rolled stamping part. In the traditional manufacturing process, this type of product is manufactured by machining. This product is widely used in the electronic field. However, this product is manufactured in a traditional way. The product needs to be clamped and positioned by a single piece, and the production efficiency is low and the product cost is high.

[0004] According to the traditional product production process, it is impossible to meet the needs of the existing market. In order to solve the problem of meeting the market demand, improving production efficiency and reducing parts costs, a precision stamping rolled product was finally produced through continuous exploration of precision progressive stamping die technology. However, due to the high requirements for roundness of this product and the long length of the product, the traditional mold forming structure cannot meet the requirements of the drawing. For example, a mold for a rolling stamping process described in patent publication number CN108704987A includes an upper die seat, an upper clamping plate, a pressure plate, a discharge plate, a lower template and a lower die seat connected in sequence from top to bottom. A guide column for guiding is also arranged between the upper die seat and the lower die seat. The upper die seat and the pressure plate slide up and down along the guide column. An equal height sleeve and a pressure spring are also connected below the upper die seat. The pressure spring acts on the upper die seat and the pressure plate. The equal height sleeve is hung on the upper die seat and is also connected to the discharge plate by a thread. The discharge plate is connected to a forming convex die. The lower template is arranged above the lower die seat, and a forming concave die is arranged on the lower template. The parts are placed on the forming concave die, and the parts are stamped by the downward movement of the punch press. The stamping process of the mold can reduce one process, and the first step of bending and forming, and the second step of forming + core pulling are used to complete the stamping. The structure of the mechanism is simple and easy to manufacture. Although the mold of the above-mentioned curling stamping process improves the production efficiency of curling stamping parts, the roundness accuracy of the curling stamping parts produced by it is insufficient and still cannot meet the product accuracy requirements, let alone the growing market demand. Summary of the invention

[0005] The purpose of the present invention is to provide a large-stroke stamping die structure and a forming method for rolled stamping parts, so as to make up for the deficiencies in the prior art and solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-stroke stamping forming die structure for rolled stamping parts, comprising an upper die base, an upper pad, an upper clamping plate, a stripping back plate, a stripping plate, a lower template, a lower pad and a lower die base, which are arranged in sequence from top to bottom. The stripping plate is provided with a stripping insert, and the lower template is provided with a lower die insert that cooperates with the stripping insert. The lower die base is provided with a horizontally arranged cylinder, and the piston rod end of the cylinder is connected to a horizontally arranged force transmission rod, and the end of the force transmission rod away from the cylinder is connected to a slider, and the slider is slidably arranged on the lower template, and the slider is connected to a horizontally arranged forming inner core, and the forming inner core corresponds to the forming cavity formed by the stripping insert and the lower die insert.

[0007] Further preferably, a mounting seat is provided on the lower mold base, and the cylinder is fixed on the mounting seat, which is convenient for installation of the cylinder and is independent of the mold, thereby facilitating maintenance and servicing and improving safety performance.

[0008] Further preferably, the piston rod of the cylinder is connected to the force transmission rod through a coupling, and the coupling can ensure the connection and power transmission between the piston rod and the force transmission rod, thereby improving safety; a support block is sleeved on the force transmission rod, and the support block is slidably set on the mounting seat, and the support of the force transmission rod is achieved through the support block, thereby ensuring smooth movement of the force transmission rod.

[0009] Further preferably, the molded inner core is connected with a connecting block, and the connecting block is connected to the slider, so that the installation of the molded inner core is convenient and firm through the connecting block.

[0010] Further preferably, the connecting block is snap-connected with the slider to facilitate quick connection of the connecting block and the slider; the slider is provided with a slot, and the connecting block is provided with a protrusion for snap connection, and the connecting block and the slider can be snap-connected by inserting the protrusion into the slot, which has a simple structure and convenient connection.

[0011] Further preferably, a guide rail is provided in the lower template, the guide rail is arranged on the lower pad, and the slider is slidably connected to the guide rail. Through the setting of the guide rail, the slider can be guaranteed to run stably, smoothly and accurately.

[0012] Further preferably, a guide block is provided at the end of the guide rail away from the cylinder, and the molding inner core is inserted into the guide block. The guide block ensures that the movement of the molding inner core is stable and smooth, and ensures that the molding inner core can be accurately inserted into the rolled stamping part to shape the roundness of the rolled stamping part; the molding inner core is slidably connected to the guide block to ensure accurate movement of the molding inner core.

[0013] Further preferably, a floating material structure is provided in the lower die insert for lifting the rolled stamping part from the lower die insert to facilitate the unloading of the rolled stamping part.

[0014] Further preferably, the molding inner core is connected to a lubrication system, and the lubricating oil can form a protective film on the friction surface, thereby reducing the wear between the molding inner core and the rolled stamping part and increasing the service life of the molding inner core.

[0015] The present invention also provides a method for long-stroke stamping of rolled stamping parts, based on the long-stroke stamping die structure for rolled stamping parts, comprising the following steps:

[0016] Step 1: Bend two opposite sides of the material;

[0017] Step 2, bend the middle of the material bent in step 1;

[0018] Step 3, feeding the bent material in step 2 into the forming die structure, and driving the stripping insert to move downward through the punch press, so that the stripping insert and the lower die insert completely wrap the bent material to form a round rolled stamping part;

[0019] Step 4, the cylinder is actuated, the cylinder piston rod is extended, and the forming inner core is driven by the force transmission rod to be inserted into the rolled stamping part that has been wrapped and formed by the stripping insert and the lower die insert in step 3, so as to shape the roundness of the rolled stamping part;

[0020] Step 5: The cylinder is actuated to withdraw the forming inner core from the shaped rolled stamping part, thereby completing the final shape of the rolled stamping part;

[0021] Step 6: The punch press moves upward, the floating structure floats the rolled stamping part, and the feeding mechanism starts feeding to achieve continuous production.

[0022] Beneficial effects: The long-stroke stamping forming die structure and forming method for rolled stamping parts of the present invention can realize the rolling forming of rolled stamping parts and the shaping of their roundness through the forming die structure, thereby ensuring the roundness precision of rolled stamping parts; specifically, through the structural arrangement of the cylinder, the force transmission rod, the slider and the forming inner core, the cylinder can drive the forming inner core to move through the force transmission rod and the slider, and the forming inner core is inserted into the rolled stamping parts, and the stripping insert and the lower die insert keep covering the outer side of the rolled stamping parts, thereby realizing the roundness shaping of the rolled stamping parts and ensuring the roundness precision of the rolled stamping parts;

[0023] The structure of the forming die is novel and practical, with good performance, wide functionality and safety. After the stamping die is maintained, its production capacity can be guaranteed to be stable, and it is easy to promote to similar stamping products. At the same time, its structural fatigue strength and service life are greatly improved. Because of its safe and reliable performance, easy maintenance, stable quality, it can meet the special requirements of stamping products and is widely used in continuous stamping.

[0024] The production of rolled stamping parts is achieved through the forming method, and the stamping method replaces the traditional machining method. The forming and roundness shaping of rolled stamping parts are fast and efficient, and the production cost is low and the product quality is high. It effectively solves the problem of low efficiency, high cost and non-round rolled stamping parts in traditional processing methods, and can meet the product precision requirements and the growing market demand. The forming mold structure and forming method are worthy of wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a rolled stamping part disclosed in the background technology of the present invention;

[0026] Figure 2 It is a schematic diagram of the lateral structure of a large-stroke stamping die structure for a rolled stamping part disclosed in an embodiment of the present invention;

[0027] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0028] Figure 4 It is a front view structural schematic diagram of a large-stroke stamping forming die structure for a rolled stamping part disclosed in an embodiment of the present invention;

[0029] Figure 5 for Figure 4 The enlarged structural diagram at B in the middle;

[0030] Figure 6 A schematic diagram of the state structure of the forming inner core of the forming die structure disclosed in the embodiment of the present invention when shaping a rolled stamping part;

[0031] Figure 7 for Figure 6 The enlarged structural diagram at C in the middle;

[0032] Figure 8 It is a schematic structural diagram of the state when the forming inner core of the forming die structure disclosed in the embodiment of the present invention is withdrawn from the rolled stamping part;

[0033] Fig. 9 for Figure 8 Enlarged structural diagram at D in the middle.

[0034] Figure markings: 1-upper die base, 2-upper pad, 3-upper clamping plate, 4-stripping backing plate, 5-stripping plate, 6-lower template, 7-lower pad, 8-lower die base, 9-stripping insert, 10-lower die insert, 11-mounting seat, 12-cylinder, 13-force transmission rod, 14-slider, 15-molding inner core, 16-support block, 17-connecting block, 18-guide rail, 19-guide block, 20-curled stamping part. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] like Figure 2-9 As shown, a large-stroke stamping forming die structure for rolled stamping parts includes an upper die base 1, an upper pad 2, an upper clamping plate 3, a stripping back plate 4, a stripping plate 5, a lower template 6, a lower pad 7 and a lower die base 8, which are arranged in sequence from top to bottom. The stripping plate 5 is provided with a stripping insert 9, and the lower template 6 is provided with a lower die insert 10 that cooperates with the stripping insert 9. Among them, the upper die base 1, the upper pad 2, the upper clamping plate 3, the stripping back plate 4, the stripping plate 5 and the stripping insert 9 constitute the upper die structure, and the lower die plate 6, the lower pad 7, the lower die base 8 and the lower die insert 10 constitute the lower die structure. The upper die structure is driven up and down by the punch press to realize the opening and closing actions of the upper die structure and the lower die structure. When the mold is closed, the material is rolled. When the mold is opened, it is convenient for the feeding mechanism to feed the material, including sending out the formed rolled stamping parts 20 and sending the unrolled material to the forming position, that is, between the stripping insert 9 and the lower die insert 10.

[0037] In the present application, a horizontally arranged cylinder 12 is provided on the lower die base 8. The cylinder 12 is a long-stroke stamping cylinder, and a horizontally arranged force transmission rod 13 is connected to the piston rod end thereof, which can drive the force transmission rod 13 to move horizontally, and then drive the slider 14 connected to the force transmission rod 13 to move horizontally. The slider 14 drives the forming inner core 15 to move horizontally, and the forming inner core 15 is inserted into the rolled stamping part 20 formed between the stripping insert 9 and the lower die insert 10, and the roundness of the rolled stamping part 20 is shaped. The molding inner core 15 corresponds to the molding cavity formed by the stripping insert 9 and the lower die insert 10, ensuring that the molding inner core 15 can be accurately inserted into the rolled stamping part 20. The molding inner core 15 can shape the uneven part inside the rolled stamping part 20 and prop up the concave part. The outside of the rolled stamping part 20 is affected by the stripping insert 9 and the lower die insert 10 and will not bulge. After internal correction, the roundness of the rolled stamping part 20 can be effectively guaranteed, and the precision and quality of the rolled stamping part 20 can be improved.

[0038] In the solution of the present application, a mounting seat 11 is provided on the lower mold base 8, and the cylinder 12 is installed through the mounting seat 11, and the cylinder 12 is installed on the side of each template, which is not only convenient for installation, maintenance and replacement, but also can improve safety.

[0039] Based on the above scheme, the piston rod of the cylinder 12 is connected to the force transmission rod 13 through a coupling to achieve quick connection between the piston rod of the cylinder 12 and the force transmission rod 13; a support block 16 is sleeved on the force transmission rod 13, and the support block 16 is slidably set on the mounting seat 11. The stability of the force transmission rod 13 can be ensured by the support block 16, and the support block 16 can slide on the mounting seat 11, so that the support block 16 can move synchronously with the force transmission rod 13 to ensure effective support for the force transmission rod 13.

[0040] In the solution of the present application, the forming inner core 15 is connected to a connecting block 17, and the connecting block 17 is connected to the slider 14. The connecting block 17 facilitates the connection between the forming inner core 15 and the slider 14, and can improve the structural strength and installation stability of the forming inner core 15.

[0041] Based on the above scheme, the connecting block 17 is connected with the slider 14 by snapping, and the slider 14 is provided with a slot, and the connecting block 17 is provided with a protrusion for snapping, that is, the connection between the connecting block 17 and the slider 14 can be realized by inserting the protrusion on the connecting block 17 into the slot of the slider 14, and the connection method is simple, but the connection is firm. In this scheme, the slider 14 is L-shaped, and the slot is set at the inner turning part of the slider 14 and passes through the slider 14 horizontally. The protrusion on the connecting block 17 is set to match the slot, and the connection between the connecting block 17 and the slider 14 can be realized by simply inserting the protrusion of the connecting block 17 from the side of the slider 14 into the slot of the slider 14.

[0042] Similarly, the present application is not limited to the structure of the above-mentioned protrusion and the slot, and can also be a dovetail slot type snap-fit ​​connection structure, or a bolt connection, and the connection method is not unique, as long as it can achieve the connection and fixation of the connecting block 17 and the slider 14. The snap-fit ​​connection is only a convenient and fast connection method.

[0043] In the solution of the present application, a guide rail 18 is provided in the lower template 6, and the guide rail 18 is set on the lower pad 7. The slider 14 is slidably connected to the guide rail 18. The guide rail 18 can ensure that the slider 14 slides smoothly, stably and accurately, and ensures that the formed inner core 15 can be accurately inserted into the circular hole of the rolled stamping part 20.

[0044] Based on the above scheme, a guide block 19 is provided at the end of the guide rail 18 away from the cylinder 12, and the molding inner core 15 is passed through the guide block 19. Through the structural design of the guide block 19, the insertion end of the molding inner core 15 can be supported to ensure the stability of the molding inner core 15; the molding inner core 15 is slidably connected to the guide block 19 to ensure the precise movement of the molding inner core 15.

[0045] In the solution of the present application, a floating material structure is provided in the lower mold insert 10, which is used to lift up the rolled stamping part 20 after forming, so as to facilitate the unloading of the rolled stamping part 20. In the present solution, the floating material structure can be a combination of a spring, a push rod and a floating material block, or a combination of a lifting cylinder, a push rod and a floating material block, both of which can realize lifting up the rolled stamping part 20.

[0046] In the solution of the present application, the molded inner core 15 is connected to a lubrication system, which can provide lubricating oil for the molded inner core 15, so that the surface of the molded inner core 15 is lubricated, which facilitates the insertion or withdrawal of the molded inner core 15 into or out of the circular hole of the rolled stamping part 20. The lubricating oil can form a protective film on the friction surface, reduce the friction coefficient, reduce the wear between the molded inner core 15 and the rolled stamping part 20, and increase the service life of the molded inner core 15. At the same time, the lubricating oil can effectively disperse and take away the heat generated by friction on the molded inner core 15, preventing the molded inner core 15 from overheating and causing increased wear.

[0047] The present application also provides a long-stroke stamping method for rolled stamping parts, based on a long-stroke stamping die structure for rolled stamping parts, through the setting of the die structure, the final forming of the rolled stamping part 20 and the roundness of the rolled stamping part 20 can be achieved. The forming die structure is a part of the continuous stamping die, and is used for the final station of the forming of the rolled stamping part 20. The forming method includes the following steps:

[0048] Step 1: bend the two opposite sides of the material through a continuous stamping die, and use arc bending to make large arc bends on both sides of the material;

[0049] Step 2: bend the middle of the material bent in step 1, fold it in half, and the bent part is in a small arc shape;

[0050] Step 3, feed the material bent in step 2 into the forming mold structure, at this time, the small arc-shaped bent part in the middle of the material is located just above the cavity of the lower die insert 10 and on the floating material structure, and then the punch drives the upper die structure to move downward, that is, drives the stripping insert 9 to move downward, and the stripping insert 9 presses the material bent in step 2 into the cavity of the lower die insert 10, and the upper die structure and the lower die structure are molded together, and the material is folded into a circular structure by the stripping insert 9 and the lower die insert 10. At this time, the bent material is completely wrapped to become a circular rolled stamping part 20;

[0051] Step 4: Shape the rolled stamping part 20. The cylinder 12 is actuated, and the piston rod of the cylinder 12 is extended, driving the force transmission rod 13 to move horizontally, driving the slider 14 to move synchronously, and the slider 14 moves on the guide rail 16, driving the forming inner core 15 to be inserted into the rolled stamping part 20 wrapped by the stripping insert 9 and the lower die insert 10 in step 3, and shaping the roundness of the rolled stamping part 20 by the forming inner core 15;

[0052] Step 5: After the shaping is completed, the cylinder 12 is actuated, and the piston rod of the cylinder 12 begins to contract, driving the force transmission rod 13 to retreat, thereby driving the slider 14 and the forming inner core 15 to retreat and reset, and withdraw the forming inner core 15 from the shaped rolled stamping part 20, completing the shaping movement of the rolled stamping part 20, and the rolled stamping part 20 is formed into the final shape;

[0053] Step six, the punch press moves upward, driving the upper die structure to move upward, the stripping insert 9 is separated from the rolled stamping part 20, the floating structure floats the rolled stamping part 20, and finally the rolled stamping part 20 that has completed shaping is sent out through the feeding mechanism, and the material to be rolled that has been bent in the new step two is transported to the top of the lower die insert 10, and then the process of steps three to six is ​​continued to realize the continuous production of the rolling operation.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the invention content within the protection scope of the present invention.

Claims

1. A long-stroke stamping die structure for rolled stamping parts, comprising an upper die base (1), an upper pad (2), an upper clamping plate (3), a stripping backing plate (4), a stripping plate (5), a lower die plate (6), a lower pad (7) and a lower die base (8) arranged in sequence from top to bottom, characterized in that: The stripping plate (5) is provided with a stripping insert (9), the lower mold plate (6) is provided with a lower mold insert (10) matched with the stripping insert (9), the lower mold base (8) is provided with a horizontally arranged cylinder (12), the piston rod end of the cylinder (12) is connected to a horizontally arranged force transmission rod (13), the end of the force transmission rod (13) away from the cylinder (12) is connected to a slider (14), the slider (14) is slidably arranged on the lower mold plate (6), the slider (14) is connected to a horizontally arranged molding inner core (15), and the molding inner core (15) corresponds to the molding cavity formed by the stripping insert (9) and the lower mold insert (10).

2. A long-stroke stamping die structure for a rolled stamping part according to claim 1, characterized in that: The lower die base (8) is provided with a mounting base (11), and the cylinder (12) is fixed on the mounting base (11).

3. A long-stroke stamping die structure for a rolled stamping part according to claim 2, characterized in that: The piston rod of the cylinder (12) is connected to the force transmission rod (13) via a coupling, a support block (16) is sleeved on the force transmission rod (13), and the support block (16) is slidably arranged on the mounting seat (11).

4. A long-stroke stamping die structure for a rolled stamping part according to claim 1, characterized in that: The molded inner core (15) is connected to a connecting block (17), and the connecting block (17) is connected to a sliding block (14).

5. A long-stroke stamping die structure for a rolled stamping part according to claim 4, characterized in that: The connecting block (17) is connected to the slider (14) by snapping, the slider (14) is provided with a snap groove, and the connecting block (17) is provided with a protrusion for snapping.

6. A long-stroke stamping die structure for a rolled stamping part according to claim 1, characterized in that: A guide rail (18) is provided inside the lower template (6), the guide rail (18) is arranged on the lower pad (7), and the slider (14) is slidably connected to the guide rail (18).

7. A long-stroke stamping die structure for a rolled stamping part according to claim 6, characterized in that: The end of the guide rail (18) away from the cylinder (12) is provided with a guide block (19), the molded inner core (15) is passed through the guide block (19), and the molded inner core (15) is slidably connected to the guide block (19).

8. The large-stroke stamping die structure for a rolled stamping part according to claim 1, characterized in that: A floating material structure is provided in the lower mold insert (10).

9. The large-stroke stamping die structure for a rolled stamping part according to claim 1, characterized in that: The molding inner core (15) is connected to a lubrication system.

10. A long-stroke stamping method for rolled stamping parts, characterized in that: The large-stroke stamping die structure for a rolled stamping part according to any one of claims 1 to 9 comprises the following steps: Step 1: Bend two opposite sides of the material; Step 2, bend the middle of the material bent in step 1; Step 3, feeding the bent material in step 2 into the forming die structure, and driving the stripping insert (9) to move downward through the punch press, so that the stripping insert (9) and the lower die insert (10) completely wrap the bent material to form a circular rolled stamping part (20); Step 4, the air cylinder (12) is actuated, the piston rod of the air cylinder (12) is extended, and the forming inner core (15) is driven by the force transmission rod (13) to be inserted into the rolled stamping part (20) that has been wrapped and formed by the stripping insert (9) and the lower die insert (10) in step 3, so as to shape the roundness of the rolled stamping part (20); Step 5: The cylinder (12) is actuated to withdraw the forming inner core (15) from the shaped rolled stamping part (20), thereby completing the final shape of the rolled stamping part (20); Step 6: The punch press moves upward, the floating structure floats the rolled stamping part (20), and the feeding mechanism starts feeding, thereby realizing continuous production.

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