Suspended limiting mechanism for negative angle forming stamping die of automotive body panels

Abstract

The present invention discloses a suspended limiting mechanism for a negative angle shaping stamping die for automobile cover parts in the field of automobile manufacturing technology, comprising a lower die seat, a horizontal pulley and a plunger. When the plunger moves downward, the horizontal pulley can slide rightward on the lower die seat through an inclined surface. The invention also comprises a guide slider, a limiting block and a rigid block. The guide slider is located below the plunger, the limiting block is slidably connected to the guide slider, a spring is provided between the bottom of the limiting block and the lower die seat, and the rigid block is arranged on the horizontal pulley. In a natural state, the limiting block is located above the rigid block under the action of the spring. When the plunger moves downward, the limiting block is pressed down, and its side contacts the end of the rigid block. During the shaping process, the reverse force from the horizontal pulley will be transmitted to the limiting block through the rigid block, and then transmitted to the lower die seat through the guide slider, so that the plunger mechanism can be prevented from being sheared by the horizontal pulley, thereby ensuring the structural strength and rigidity of the entire mold and meeting the precision requirements for shaping the water trough of the top cover.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to a suspended limiting mechanism of a negative angle shaping stamping die for an automobile covering part. Background Art

[0002] When the automobile roof mold is shaping the water trough, due to the negative angle of this part, a plunger pulley mechanism is required to complete the material pressing and shaping work of the water trough part. However, the main function of the plunger and the plunger seat before shaping is to push the pulley mechanism to move, and it is restricted by the mold structure space, and its structural rigidity is not high. During the shaping process, when the mold is shaped to the bottom dead center, the equivalent effect of the shaping force will cause the plunger and the plunger seat to bear a large shaping reaction force, which will cause the plunger and the plunger seat to produce elastic deformation, resulting in a change in the gap between the shaping convex and concave model surfaces, resulting in serious rebound defects in the water trough part after the mold is opened, further affecting the size and position accuracy of the water trough part. In addition, when the shaping reaction force exceeds the tensile limit of the plunger and the plunger seat material, the plunger and the plunger seat may even break, seriously affecting the structural safety of the mold. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the existing inserting knife pulley mechanism, the technical problem to be solved by the present invention is to provide a suspended limiting mechanism for the negative angle shaping stamping die of automobile cover parts which can improve the die structure strength and stamping accuracy.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts comprises a lower die base, a horizontal pulley and a knife inserting mechanism, wherein the knife inserting mechanism comprises a knife inserting mechanism movable in the vertical direction, and the right side of the knife inserting mechanism and the left end of the horizontal pulley are respectively provided with mutually matching inclined surfaces, and when the knife inserting mechanism moves downward, the inclined surfaces can be used to make the horizontal pulley slide rightward on the lower die base, and further comprises a guide slider, a limiting block and a rigid block, wherein the guide slider is located below the knife inserting mechanism and fixed on the lower die base, the limiting block is slidably connected with the guide slider in the vertical direction, a spring is provided between the bottom of the limiting block and the lower die base, and the rigid block is arranged below the left end of the horizontal pulley, and in the natural state, the limiting block is located above the rigid block under the action of the spring, and when the knife inserting mechanism moves downward to the maximum position, the limiting block is pressed down, and its side surface contacts the end of the rigid block.

[0006] Furthermore, a cushion block is provided at the bottom of the insert.

[0007] Furthermore, the cushion block is fixed to the bottom of the insert by a limit screw.

[0008] Furthermore, the spring is a nitrogen spring.

[0009] Furthermore, the limit block is in the shape of an elongated strip, and its length is equivalent to the width of the horizontal pulley. The rigid blocks include at least three blocks, which are arranged at intervals along the width direction of the horizontal pulley.

[0010] Furthermore, the guide sliding blocks include at least two, which are arranged at intervals along the width direction of the entire mold, and the cross-section of the guide sliding blocks is a U-shaped structure.

[0011] Furthermore, the springs include at least two springs, which are evenly spaced and arranged below the limit block along the length direction of the limit block.

[0012] Furthermore, the limit block and the rigid block are both made of impact-resistant material, and a wear-resistant coating is provided on the contact surfaces of the two.

[0013] Furthermore, a step hole is provided in the middle of the limit block in the vertical direction, and a bolt is provided in the step hole to connect with the lower mold base. When the limit block is at the highest point, the nut of the bolt is pressed on the step surface of the step hole. When the limit block is pressed to the lowest position, the top of the bolt does not exceed the top of the limit block.

[0014] Furthermore, in a natural state, the pushing action of the spring makes the bottom of the limit block at least 5 mm away from the top of the rigid block. When the horizontal pulley moves to the working position, the distance between the rigid block and the limit block does not exceed 3 mm.

[0015] The beneficial effect of the present invention is that a guide slide block and a limit block are arranged below the inserting knife, and a rigid block is arranged on the horizontal pulley. When the inserting knife moves downward to shape the automobile cover, the reverse force from the horizontal pulley is transmitted to the limit block through the rigid block, and the limit block is then transmitted to the lower die seat through the guide slide block. Therefore, the end of the inserting knife mechanism can be prevented from being subjected to the shear load of the horizontal pulley, thereby ensuring the structural strength and rigidity of the entire mold and meeting the precision requirements for shaping the water trough of the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the structure of the present invention.

[0017] Figure 2 It is a top view of the structure of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the present invention for shaping automobile covering parts.

[0019] Marked in the figure are, 1-lower die base, 2-horizontal pulley, 3-insert knife, 4-guide slide block, 5-limit block, 6-rigid block, 7-spring, 8-upper die presser, 9-angled wedge presser, 21-pulley guide plate, 31-pad, 32-limit screw, 33-insert knife guide plate, 51-step hole, 52-bolt. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 , Figure 2 As shown, the suspended limiting mechanism of the negative angle shaping stamping die of the automobile cover of the present invention comprises a lower die base 1, a horizontal pulley 2 and a knife inserting mechanism, wherein the knife inserting mechanism comprises a knife inserting 3 which can move in the vertical direction, and the right side of the knife inserting 3 and the left end of the horizontal pulley 2 are respectively provided with mutually matching inclined surfaces, and when the knife inserting 3 moves downward, the horizontal pulley 2 can slide rightward on the lower die base 1 through the inclined surfaces, and further comprises a guide slider 4, a limiting block 5 and a rigid block 6, wherein the guide slider 4 is located below the knife inserting mechanism and is fixed on the lower die base 1, and the limiting block 5 is slidably connected with the guide slider 4 in the vertical direction, and a spring 7 is provided between the bottom of the limiting block 5 and the lower die base 1, and the rigid block 6 is arranged below the left end of the horizontal pulley 2, and in the natural state, the limiting block 5 is located above the rigid block 6 under the action of the spring 7, and when the knife inserting 3 moves downward to the maximum position, the limiting block 5 is pressed down, and its side surface contacts the end of the rigid block 6.

[0022] The working process of the present invention is as follows: Figure 3 As shown, the profile segment ABECD of the automobile top cover part, where the AB segment and the CD segment have been formed in the previous process, and the BEC profile is a negative angle structure of the water trough. In implementing the BC segment shaping scheme, the inserting knife 3 is used to drive the horizontal pulley 2 to move rightward, so that the BC segment die reaches the shaping station, and at the same time, the upper die presser 8 presses the profile segment AB, and the inclined wedge presser 9 presses the profile segment CD. The BC segment punch completes the shaping of the profile segment BC under the action of the shaping force. The inserting knife 3 is as shown in FIG. Figure 1 As shown, a knife inserting guide plate 33 is provided on the right side, and a slope is provided at the bottom of the knife inserting guide plate 33. A pulley guide plate 21 is provided on the left side of the horizontal pulley 2, and a slope is provided at the upper end of the pulley guide plate 21. When the knife inserting 3 moves downward, the horizontal pulley 2 moves to the right under the cooperation of the slope section rs of the knife inserting guide plate 33 and the slope section RS of the pulley guide plate 21. When the knife inserting 3 completes the slope section rs, the horizontal pulley 2 moves to the rightmost position, and then the knife inserting 3 continues to move downward, contacts the limit block 5, and drives the limit block 5 to move downward. When the knife inserting 3 completes the vertical section st, the limit block 5 reaches the lowest position, and the middle part of its side contacts or leaves a certain gap with the rigid block 6 on the left side of the horizontal pulley 2. During the shaping process, the shaping force of the BC segment punch will be transmitted to the sliding carriage 2, and then transmitted to the limit block 5 through the rigid block 6, and the limit block 5 will be transmitted to the lower die seat 1 through the guide slider 4. Therefore, the end of the inserting knife mechanism can be prevented from being subjected to the shear load of the horizontal pulley 2, thereby ensuring the structural strength and rigidity of the entire mold and meeting the precision requirements for shaping the water trough of the top cover.

[0023] In order to avoid rigid impact between the inserting knife mechanism and the limiting block 5 , a cushion block 31 is provided at the bottom of the inserting knife 3 .

[0024] Furthermore, the cushion block 31 is fixed to the bottom of the insert 3 by a limit screw 32. By fixing the cushion block 31 with the limit screw 32, the overall height of the cushion block 31 can be adjusted to meet the stroke control requirements of the limit block 5, and the limit screw 32 is also used to protect the stroke.

[0025] For the spring 7, an ordinary steel wire spring or a nitrogen spring can be used. The rebound of the nitrogen spring is more stable and can extend the service life of the equipment.

[0026] As for the limit block 5 , since the horizontal pulley 2 has a certain width, in order to ensure uniform force, the limit block 5 is designed to be a long strip, and its length is equivalent to the width of the horizontal pulley 2 . The rigid blocks 6 include at least three, which are arranged at intervals along the width direction of the horizontal pulley 2 .

[0027] For the guide slide block 4, in order to adapt to the long strip-shaped limit block 5, the guide slide block 4 includes at least two, and is arranged at intervals along the width direction of the entire mold, so as to evenly transfer the force from the limit block 5 to the lower mold base 1. In addition, in order to facilitate the installation of the limit block 5, the guide slide block 4 preferably adopts a structure with a U-shaped cross section.

[0028] Similarly, in order to adapt to the elongated limiting block 5 , the springs 7 should include at least two springs 7 , which are evenly spaced below the limiting block 5 along the length direction of the limiting block 5 so as to evenly push up the limiting block 5 .

[0029] Furthermore, in order to resist the directional force from the horizontal pulley 2, the limit block 5 and the rigid block 6 are both made of impact-resistant materials, and a wear-resistant coating is provided on the contact surfaces of the two.

[0030] In order to realize the vertical limiting of the limit block 5, a step hole 51 is provided in the middle of the limit block 5 along the vertical direction, and a bolt 52 is provided in the step hole 51 to be connected with the lower die base 1. When the limit block 5 is located at the highest point, the nut of the bolt 52 is pressed on the step surface of the step hole 51 to prevent the limit block 5 from moving outward; when the limit block 5 is pressed to the lowest position, the top of the bolt 52 does not exceed the top of the limit block 5.

[0031] To avoid interference, in a natural state, the pushing action of the spring 7 makes the bottom of the limit block 5 at least 5 mm away from the top of the rigid block 6. To ensure that the limit block 5 can stably withstand the impact from the rigid block 6, when the horizontal pulley 2 moves to the working position, the distance between the rigid block 6 and the limit block 5 does not exceed 3 mm.

[0032] The stroke control of the entire limit mechanism should be designed according to the following process:

[0033] Here, the BEC section of the top cover water channel is used as the explanation object, and the BE section is the stamping negative angle section. The length of the negative angle straight line is obtained according to the design data of the product and is recorded as l BE , the angle of the wedge drive seat is selected as α, and the running stroke of the horizontal pulley is recorded as l2,

[0034] l2=(l BE +5)cosαmm, where the value 5 is the designed deviation;

[0035] The stroke of the oblique line segment rs of the inserting blade guide plate 32 on the inserting blade mechanism is recorded as l rs , the angle of the inclined guide plate is β, we can get

[0036] l rs =(l2 / sinβ+2)=(l BE +5)cosα / sinβ+2mm, where the value 2 is the designed deviation;

[0037] The height of the rigid block in the stamping direction is recorded as h, and the stroke of the straight segment st of the insert is recorded as l st , the compression stroke of spring 7 is recorded as l7, and l st =l7=(h+5)mm, where the value 5 is the designed deviation;

[0038] The safety stroke of the limit screw 32 is denoted as l 32 , there is l 32 = l st +2=(h+7)mm, where the value 2 is the designed deviation.

[0039] In this way, the negative angle size of the top cover water flow channel is known, and the key size of the suspended forced limit mechanism can be calculated based on the drive angles of the inclined wedge drive seat and the inserting knife guide plate.

Claims

1. A suspended limiting mechanism for a negative angle shaping stamping die for automobile cover parts, comprising a lower die base (1), a horizontal pulley (2) and a knife inserting mechanism, wherein the knife inserting mechanism comprises a knife inserting (3) movable in a vertical direction, wherein the right side of the knife inserting (3) and the left end of the horizontal pulley (2) are respectively provided with mutually matching inclined surfaces, and when the knife inserting (3) moves downward, the inclined surface can cause the horizontal pulley (2) to slide rightward on the lower die base (1), wherein the characteristics are: The invention also comprises a guide slide block (4), a limit block (5) and a rigid block (6); the guide slide block (4) is located below the inserting knife mechanism and is fixed on the lower die seat (1); the limit block (5) is slidably connected with the guide slide block (4) in the vertical direction; a spring (7) is provided between the bottom of the limit block (5) and the lower die seat (1); the rigid block (6) is arranged below the left end of the horizontal pulley (2); in a natural state, the limit block (5) is located above the rigid block (6) under the action of the spring (7); when the inserting knife (3) moves downward to the maximum position, the limit block (5) is pressed down, and its side surface contacts the end of the rigid block (6).

2. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 1, characterized in that: A cushion block (31) is provided at the bottom of the inserting blade (3).

3. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 2, characterized in that: The cushion block (31) is fixed to the bottom of the insert (3) by means of a limit screw (32).

4. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 1, characterized in that: The spring (7) is a nitrogen spring.

5. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 1, characterized in that: The limit block (5) is in the shape of an elongated strip, and its length is equivalent to the width of the horizontal pulley (2). The rigid blocks (6) include at least three, which are arranged at intervals along the width direction of the horizontal pulley (2).

6. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 5, characterized in that: The guide sliding blocks (4) include at least two, which are arranged at intervals along the width direction of the entire mold, and the cross section of the guide sliding blocks (4) is a U-shaped structure.

7. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 5, characterized in that: The springs (7) include at least two springs, which are evenly spaced and arranged below the limit block (5) along the length direction of the limit block (5).

8. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 5, characterized in that: The limit block (5) and the rigid block (6) are both made of impact-resistant material, and a wear-resistant coating is provided on the contact surfaces of the two.

9. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 1, characterized in that: A stepped hole (51) is provided in the middle of the limit block (5) along the vertical direction. A bolt (52) is provided in the stepped hole (51) and is connected to the lower die base (1). When the limit block (5) is located at the highest position, the nut of the bolt (52) is pressed on the stepped surface of the stepped hole (51). When the limit block (5) is pressed to the lowest position, the top of the bolt (52) does not exceed the top of the limit block (5).

10. The suspended limiting mechanism of the negative angle shaping stamping die for automobile cover parts according to claim 1, characterized in that: In a natural state, the pushing action of the spring (7) causes the bottom of the limit block (5) to be at least 5 mm away from the top of the rigid block (6); when the horizontal pulley (2) moves to the working position, the distance between the rigid block (6) and the limit block (5) does not exceed 3 mm.

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