Return stroke mechanism for drawing forming lower pressing material of progressive die

Abstract

The utility model discloses a return stroke mechanism for drawing forming and downward pressing of a progressive die, and relates to the technical field of progressive die structures. The upper pressing material is elastically connected with the upper die base, the upper pressing material is provided with a first elastic and rotatable pre-tightening piece, and the free end of the first elastic piece abuts against the pre-tightening piece; the second elastic piece is fixed on the upper die holder; a lower die holder; the lower pressing material is elastically connected with the lower die holder; and after the upper die base and the lower die base are assembled, the free end of the second elastic piece abuts against the pre-tightening piece, so that the pre-pressing end of the pre-tightening piece turns over towards the first elastic piece, and the pre-pressing end abuts against the lower pressing material. According to the return stroke mechanism for the drawing forming lower pressing material of the progressive die, the impact of a forming jig on a product during die opening can be effectively reduced, and the molded surface yield of the formed product is improved.

Description

Technical Field

[0001] The present application relates to the technical field of continuous die structures, and in particular to a return mechanism for a pressing material during continuous die drawing. Background Art

[0002] The forming of the reinforcing bracket on the automobile door frame requires the use of a continuous die. During the continuous die drawing process, since the forming fixture on the lower die is floating, it is easy to quickly lift up the formed product after the molding is completed and the mold is opened. The large lifting force can easily cause defects such as wrinkles or dents on the surface of the formed product, affecting the surface accuracy of the product. Utility Model Content

[0003] The present application aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the present application provides a return mechanism for the lower pressing material in a continuous die drawing forming process, which effectively reduces the impact of the forming jig on the product when the mold is opened and improves the surface yield of the product after forming.

[0004] According to the embodiment of the present application, the return mechanism of the lower pressing material of the continuous die drawing molding provided by the embodiment of the present application includes an upper die base; an upper pressing material elastically connected to the upper die base, the upper pressing material is provided with a first elastic member and a rotatable pre-tightening member, and the free end of the first elastic member presses against the pre-tightening member; a second elastic member fixed to the upper die base; a lower die base; and a lower pressing material elastically connected to the lower die base; wherein, after the upper die base and the lower die base are molded together, the free end of the second elastic member presses against the pre-tightening member, so that the pre-tightening end of the pre-tightening member flips toward the first elastic member, and the pre-tightening end presses against the lower pressing material.

[0005] According to the return mechanism of the lower pressing material in the continuous die drawing molding described in the embodiment of the present application, the preload member has a first end and a second end on the same side, the first end and the second end are respectively located on both sides of the rotation center of the preload member, the first elastic member presses against the first end, and the second elastic member presses against the second end.

[0006] According to the return mechanism of the lower pressing material in the continuous die drawing molding described in the embodiment of the present application, when the upper die base is not molded with the lower die base, the pre-pressing end is located below between the second end and the rotation center of the pre-tightening member.

[0007] According to the return mechanism of the continuous die drawing forming pressing material described in the embodiment of the present application, both sides of the pre-pressing end are inclined surfaces, and the intersection of the inclined surfaces on both sides is connected by an arc surface.

[0008] According to the return mechanism of the lower pressing material of the continuous die drawing molding described in the embodiment of the present application, the side of the upper pressing material facing the lower pressing material has a groove for installing the preload part, and the preload part is rotatably arranged in the groove by a rotating shaft.

[0009] According to the return mechanism of the continuous die drawing pressing material described in the embodiment of the present application, the first elastic member is a nitrogen spring, and the free end of the first elastic member has a first push rod, and the push rod enters the groove and presses against the preload member.

[0010] According to the return mechanism of the lower pressing material in the continuous die drawing molding described in the embodiment of the present application, the second elastic member is a nitrogen spring, the free end of the second elastic member has a second push rod, and a through hole is provided at the position of the upper pressing material facing the second push rod, and the through hole is connected to the groove.

[0011] According to the return mechanism of the lower pressing material in the continuous die drawing forming described in the embodiment of the present application, the elastic force of the second elastic member is greater than the elastic force of the first elastic member.

[0012] According to the return mechanism of the lower pressing material in the continuous die drawing forming described in the embodiment of the present application, the upper die seat is provided with a flanging knife block, the lower pressing material is facing the flanging knife block, and the lower die seat is provided with a shaping block, and the shaping block is facing the upper pressing material.

[0013] According to the return mechanism of the lower pressing material of the continuous die drawing molding described in the embodiment of the present application, there are multiple upper pressing materials, and the upper pressing materials are connected to the upper die base through a third elastic member. There are multiple lower pressing materials, and the lower pressing materials are connected to the lower die base through a fourth elastic member. The third elastic member and the fourth elastic member are both nitrogen springs.

[0014] The return mechanism of the lower pressing material of the above-mentioned continuous die drawing molding has at least the following beneficial effects: when the mold is closed, the additional pre-tightening member presses against the lower pressing material, and as the mold closing is further carried out, the second elastic member moves down to press against the pre-tightening member, so that the pre-tightening member overcomes the pre-lifting force of the first elastic member and rotates, ensuring that there is a spacing of the thickness of the product between the pre-tightening member and the lower pressing material, and the blank is clamped by the tool on the upper die seat and the lower pressing material and the product is formed in the form of drawing. After the mold is completely closed, the product is formed, and there is no wrinkle on the forming surface, and the product surface accuracy meets the quality requirements; when the mold is opened, the upper die seat gradually moves away from the lower die seat, and the upper die seat separates from the lower pressing material. At this time, the upper pressing material maintains the pre-pressed product, and the second elastic member maintains pressing against the pre-tightening member, so that the pre-tightening member maintains pressing against the lower pressing material, ensuring The lower pressing material will not suddenly lift up the product when losing the clamping force of the upper die seat, effectively protecting the product's profile; with further mold opening, the second elastic member releases the pressure on the preload member, and the preload member rotates back to the original position under the action of the first elastic member, but the preload member still pushes out the lower pressing material at this time, and the product will not be lifted up and will not be deformed. At this time, the upper pressing material maintains the preloaded product, and then the upper die seat continues to move upward, so that the upper pressing material is no longer preloading the product and follows the upper die seat to move upward, and the preload member follows the upper pressing material to move upward. After the preload member returns to its original position, the restriction on the lower pressing material is released, so that the lower pressing material can return to its original position in a relatively slow manner. When the upper die seat continues to move upward to the highest point, the product floats to the feeding position with the lower pressing material, and the feeder feeds the material. The mold repeats the above actions to complete mass production. The setting of the preload member can effectively avoid the impact of the lower pressing material on the product when the mold is opened, and avoid the impact caused by the rebound of the lower pressing material, which causes wrinkles or depressions on the product's profile. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present application is further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 It is a structural schematic diagram of the return mechanism of the lower pressing material of the continuous die drawing forming embodiment of the present application;

[0017] Figure 2 yes Figure 1 The cross-sectional view along the BB direction;

[0018] Figure 3 yes Figure 1 The cross-sectional view along the AA direction;

[0019] Figure 4 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 1 ;

[0020] Figure 5 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 2 ;

[0021] Figure 6 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 3 ;

[0022] Figure 7 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 4 ;

[0023] Figure 8 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 5 ;

[0024] Fig. 9 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 6 ;

[0025] Fig.10 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 7 ;

[0026] Fig.11 This is a schematic diagram of the upper mold base and the lower mold base when the mold is closed in the embodiment of the present application. Figure 8 ;

[0027] Fig.12 It is a schematic diagram of the structure of the pre-tightening member in an embodiment of the present application.

[0028] Figure markings: upper die base 100, third elastic member 110, upper pressing material 120, second elastic member 130, first elastic member 140, pre-tightening member 150, second end 151, first end 152, pre-pressing end 153, inclined surface 154, flanging knife block 160, lower die base 200, fourth elastic member 210, lower pressing material 220, product 300. DETAILED DESCRIPTION

[0029] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0033] Reference Figures 1 to 3 The return mechanism of the lower pressing material 220 of the continuous die drawing forming embodiment of the present application includes an upper die base 100, a lower die base 200, an upper pressing material 120, a lower pressing material 220, a first elastic member 140, a second elastic member 130 and a pre-tightening member 150.

[0034] Among them, the upper mold base 100 is arranged opposite to the lower mold base 200, and the upper mold base 100 can move toward the lower mold base 200 to close the mold, and the upper pressing material 120 is elastically connected to the upper mold base 100. Specifically, there are multiple upper pressing materials 120, and the upper pressing material 120 is connected to the upper mold base 100 through a third elastic member 110. The upper pressing material 120 is provided with a first elastic member 140 and a rotatable preload member 150. The free end of the first elastic member 140 presses against the preload member 150, and the second elastic member 130 is fixed to the upper mold base 100, while the lower pressing material 220 is elastically connected to the lower mold base 200. Specifically, there are multiple lower pressing materials 220, and the lower pressing material 220 is connected to the lower mold base 200 through a fourth elastic member 210. The third elastic member 110 and the fourth elastic member 210 are both nitrogen springs. When the upper mold base 100 and the lower mold base 200 are molded together, the free end of the second elastic member 130 presses against the preload member 150 , so that the preload end 153 of the preload member 150 turns toward the first elastic member 140 , and the preload end 153 presses against the lower pressing material 220 .

[0035] Furthermore, the upper die base 100 is provided with a flanging knife block 160, and the lower pressing material 220 is opposite to the flanging knife block 160. The lower die base 200 is provided with a shaping block, and the shaping block is opposite to the upper pressing material 120. When the mold is closed, the product 300 is pressed by the upper pressing material 120 and the shaping block, and the molding of the product 300 is completed by the cooperation of the flanging knife block 160 and the lower pressing material 220.

[0036] Specifically, when the mold is closed, the additional pre-tightening member 150 is pressed against the lower pressing material 220. As the mold is closed further, the second elastic member 130 moves down to press against the pre-tightening member 150, so that the pre-tightening member 150 overcomes the pre-pushing force of the first elastic member 140 and rotates, ensuring that there is a gap of the thickness of the product 300 between the pre-tightening member 150 and the lower pressing material 220. The blank is clamped by the flanging knife block 160 on the upper mold base 100 and the lower pressing material 220, and the product 300 is formed in the form of drawing. When the mold is completely closed, the product 300 is formed, and there is no wrinkle on the forming surface. The surface accuracy of the product 300 meets the quality requirements. When the mold is opened, the upper mold base 100 gradually moves away from the lower mold base 200, and the upper mold base 100 is separated from the lower pressing material 220. At this time, the upper pressing material 120 maintains to press part of the product 300 against the shaping block, and the second elastic member 130 maintains to press the pre-tightening member 150, so that the pre-tightening member 150 maintains to press the lower pressing material 220, ensuring that the lower pressing material 220 loses the upper mold. The clamping force of the seat 100 will not suddenly lift up the product 300, effectively protecting the surface of the product 300; as the mold is further opened, the second elastic member 130 releases the pressure on the pre-tightening member 150, and the pre-tightening member 150 rotates back to the original position under the action of the first elastic member 140, but the pre-tightening member 150 still pushes out the lower pressing material 220 at this time, and the product 300 will not be lifted up and deformed. At this time, the upper pressing material 120 maintains to press part of the product 300 against the shaping block, and then the upper mold is The seat 100 continues to move upward, so that the upper pressing material 120 is no longer pre-pressing the product 300 and moves upward with the upper die seat 100, and the pre-tightening member 150 moves upward with the upper pressing material 120. After the pre-tightening member 150 returns to its original position, the restriction on the lower pressing material 220 is released, so that the lower pressing material 220 can return to its original position in a relatively slow manner. When the upper die seat 100 continues to move upward to the highest point, the product 300 floats to the feeding position with the lower pressing material 220, and the feeder feeds the material. The mold repeats the above actions to complete batch production. The setting of the pre-tightening member 150 can effectively prevent the impact of the lower pressing material 220 on the product 300 when the mold is opened, and avoid the impact caused by the rebound of the lower pressing material 220, which causes the surface of the product 300 to have wrinkles or depressions and other defects.

[0037] Further, such as Fig.12 As shown, the same side of the preload member 150 has a first end 152 and a second end 151, the first end 152 and the second end 151 are respectively located on both sides of the rotation center of the preload member 150, the first elastic member 140 presses against the first end 152, and the second elastic member 130 presses against the second end 151. By reasonably allocating the position of the first end 152 relative to the second end 151 and the rotation center of the preload member 150, and then properly adjusting the resilience of the first elastic member 140 and the second elastic member 130, when the mold is closed, the difference in resilience can be effectively used to cause the preload member 150 to rebound, ensuring smooth mold closing, and not affecting the molding of the lower pressing material 220, and when the mold is opened, the impact of the lower pressing material 220 when it rebounds can be effectively reduced.

[0038] Further, such as Figure 2 As shown, when the upper die base 100 is not molded with the lower die base 200, the pre-pressing end 153 is located below the second end 151 and the rotation center of the pre-tightening member 150. However, when the mold is closed, the upper pressing material 120 on the upper die base 100 first contacts the product 300. After the upper pressing material 120 and the shaping block press the product 300, the pre-tightening member 150 contacts the lower pressing material 220, and then the flanging knife block 160 cooperates with the lower pressing material 220 to complete the molding of the product 300. By reasonably adjusting the position of the first end 152 relative to the second end 151 and the rotation center of the pre-tightening member 150, the difference in rebound force can be effectively used to cause the pre-tightening member 150 to rebound when the mold is closed, ensuring the smooth progress of the mold closing, and not affecting the molding of the lower pressing material 220. In addition, the impact of the lower pressing material 220 rebounding when the mold is opened can be effectively reduced.

[0039] In order to smoothly turn over the preload member 150 during mold closing, the two sides of the preload end 153 are inclined surfaces 154, and the intersection of the two inclined surfaces 154 is connected by an arc surface. The setting of the inclined surface 154 plays a role in guiding the preload member 150 to turn over.

[0040] In some embodiments, the upper pressing material 120 has a groove for installing the preload 150 on one side facing the lower pressing material 220. The preload 150 is rotatably disposed in the groove via a rotating shaft so that the preload 150 can rotate around the rotation center under the action of external force.

[0041] Furthermore, the first elastic member 140 is a nitrogen spring, and the free end of the first elastic member 140 has a first push rod, which enters the groove and presses against the preload member 150. The second elastic member 130 is a nitrogen spring, and the free end of the second elastic member 130 has a second push rod, and the upper pressing material 120 is provided with a through hole at a position opposite to the second push rod, and the through hole is connected to the groove, so that the second push rod can enter the groove from the through hole and press against the second end 151. In a preferred embodiment, the elastic force of the second elastic member 130 is greater than the elastic force of the first elastic member 140, so as to ensure that the preload member 150 can be flipped to a suitable position when the mold is closed, and to ensure that there is a gap of the thickness of the product 300 between the preload member 150 and the lower pressing material 220.

[0042] The following will describe the working process of the entire return mechanism in detail:

[0043] like Figure 2 and Figure 3 In the mold opening state shown, the lower pressing material 220 floats up 30 mm under the action of the fourth elastic member 210, the pre-tightening member 150 is in a vertical state under the action of the first elastic member 140, the upper mold base 100 moves downward, and the upper pressing material 120 presses the pressing surface of the material strip and the product 300 under the action of the third elastic member 110;

[0044] like Figure 4 and Figure 5 As shown, the upper die holder 100 continues to move downward, and when there is still 30 mm to close, the flanging knife block 160 contacts the lower pressing material 220, the pre-tightening end of the pre-tightening member 150 contacts the balancing block of the lower pressing material 220, and the second ejector pin of the second elastic member 130 contacts the second end 151;

[0045] like Figures 6 to 11 As shown, the mold continues to move downward, and the second ejector pin presses the preload member 150 under the action of the nitrogen spring, and the preload member 150 rotates. The preload member 150 and the lower pressing material 220 maintain a gap of the material thickness of the product 300, and the flanging knife block 160 and the lower pressing material 220 clamp the product 300, and the product 300 is formed in the form of drawing until the upper die seat 100 and the lower die seat 200 are closed, and the product 300 is formed, the forming surface is wrinkle-free, and the surface accuracy of the product 300 meets the quality requirements;

[0046] When the mold is opened, the upper mold base 100 moves upward, the flanging knife block 160 is separated from the lower pressing material 220, and the second ejector rod, under the action of the nitrogen spring, keeps the preload member 150 in a stationary state, always pressing the lower pressing material 220. At this time, both the upper pressing material 120 and the lower pressing material 220 are in a stationary state, and the product 300 will not be lifted up and will not be deformed;

[0047] When the upper die seat 100 continues to move upward to 30 mm, the second ejector rod is separated from the pre-tightening member 150. Under the action of the first elastic member 140, the pre-tightening member 150 rotates and returns to the initial position. The pre-tightening member 150 still supports the lower pressing material 220, and the product 300 will not be lifted up and will not be deformed.

[0048] When the upper die holder 100 moves upward to 50 mm, the upper pressing material 120 is still stationary under the action of the nitrogen spring, the preload member 150 is still in the initial state under the action of the first elastic member 140, the lower pressing material 220 is in a stationary state, and the product 300 is not lifted up and is not deformed;

[0049] When the upper die base 100 moves upward by more than 50 mm, the flanging knife block 160 and the upper pressing material 120 move upward, and the lower pressing material 220 moves upward along with the upper pressing material 120, and the product 300 will not be lifted up and will not be deformed;

[0050] The upper die holder 100 continues to move upward and rises to the highest point, and the product 300 floats up to the feeding position along with the material belt, and the feeder feeds the material. The die repeats the above actions to complete batch production.

[0051] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A return mechanism for a continuous die drawing material, characterized in that: include Upper die seat; An upper pressing material elastically connected to the upper die seat, the upper pressing material being provided with a first elastic member and a rotatable pre-tightening member, the free end of the first elastic member pressing against the pre-tightening member; A second elastic member fixed to the upper die base; Lower die seat; as well as A lower pressing material elastically connected to the lower die seat; Wherein, after the upper die base and the lower die base are molded together, the free end of the second elastic member presses against the preload member, so that the preload end of the preload member flips toward the first elastic member, and the preload end presses against the lower pressing material.

2. The return mechanism of the continuous die drawing forming lower pressing material according to claim 1, characterized in that: The preload member has a first end and a second end on the same side, the first end and the second end are respectively located on both sides of the rotation center of the preload member, the first elastic member presses against the first end, and the second elastic member presses against the second end.

3. The return mechanism of the lower pressing material in the continuous die drawing molding according to claim 2 is characterized in that: When the upper die base is not in mold closing relationship with the lower die base, the pre-pressing end is located below between the second end and the rotation center of the pre-tightening member.

4. The return mechanism of the lower pressing material in the continuous die drawing molding according to claim 1 is characterized in that: The two sides of the pre-pressing end are inclined surfaces, and the intersection of the inclined surfaces on the two sides is connected by an arc surface.

5. The return mechanism of the lower pressing material in the continuous die drawing molding according to claim 1 is characterized in that: A groove for installing the pre-tightening member is provided on one side of the upper pressing material facing the lower pressing material, and the pre-tightening member is rotatably arranged in the groove via a rotating shaft.

6. The return mechanism of the lower pressing material in the continuous die drawing molding according to claim 5 is characterized in that: The first elastic member is a nitrogen spring. The free end of the first elastic member has a first push rod. The push rod enters the groove and presses against the preload member.

7. The return mechanism of the lower pressing material in the continuous die drawing molding according to claim 6 is characterized in that: The second elastic member is a nitrogen spring, the free end of the second elastic member is provided with a second push rod, a through hole is provided at a position of the upper pressing material facing the second push rod, and the through hole is connected to the groove.

8. The return mechanism for the lower pressing material in the continuous die drawing molding according to claim 7 is characterized in that: The elastic force of the second elastic member is greater than the elastic force of the first elastic member.

9. The return mechanism for the lower pressing material of the continuous die drawing molding according to any one of claims 1 to 8, characterized in that: The upper die seat is provided with a flanging knife block, and the lower pressing material is directly opposite to the flanging knife block. The lower die seat is provided with a shaping block, and the shaping block is directly opposite to the upper pressing material.

10. The return mechanism for the lower pressing material in the continuous die drawing molding according to claim 9, characterized in that: There are multiple upper pressing materials, and the upper pressing materials are connected to the upper die seat through a third elastic member. There are multiple lower pressing materials, and the lower pressing materials are connected to the lower die seat through a fourth elastic member. The third elastic member and the fourth elastic member are both nitrogen springs.

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