JP2008260060A - Negative angle forming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a negative angle forming die which prevents a rotating cam which is retreated during rotating from interfering with a nearly U-shaped groove in the cross section of a workpiece even when the entering formed part of the workpiece is the nearly U-shaped groove in the cross section. <P>SOLUTION: The rotating cam 3 is formed from an outside rotating cam 30 and an inside rotating cam 31 having the same length as this outside rotating cam in the axial direction and also the entering forming part 32 is composed on the tip side of the inside rotating cam 30. The positions of the centers of rotation of the outside rotating cam 30 and the inside rotating cam 31 are shifted so that the locus of the rotation and retreat of the entering forming part 32 of the inside rotating cam 31 does not interfere with the workpiece W. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a negative angle forming die for forming a metal thin plate, and more particularly, to a case where a rotating cam that rotates and retracts after an intrusion forming and an intrusion forming portion of a workpiece interfere with each other. Here, negative angle molding refers to molding that enters the lower mold from the downward trajectory of the upper mold in the linear direction.

  Negative angle forming, in which a metal thin plate workpiece is inserted into the lower die from the downward trajectory in the linear direction of the upper die, is usually performed using a slide cam.

  In conventional intrusion forming of a thin metal plate workpiece, the workpiece is placed on the lower die, the upper die is lowered vertically and the lower die passive cam is driven by the upper die actuating cam to move the workpiece horizontally. When machining was done from the direction, and the machining was completed and the upper mold was raised, the operating cam was retracted by the spring.

  In this case, the forming part of the passive cam for forming the work by sliding from the lateral direction of the work is formed in the same integrated shape as the forming part shape of the work, but the lower mold on which the work is placed Since the workpiece must be taken out from the lower mold after processing is completed, either the lower die entry part is divided and retracted, or the rear part of the entry part is deleted and the work is moved forward to remove the workpiece. It must be possible to remove it. If the degree of penetration is small, it will not be a problem, but if the degree of penetration is large or the work has a long and narrow frame-shaped cross section, it is a groove-like part. Since the groove width of the workpiece is narrow, if the part of the lower mold that has entered is divided or deleted, the shape of the passive cam molding part cannot be clearly formed, and the strength of the lower mold is insufficient, so Was impossible.

  Also, the product may be twisted or distorted, and it may be necessary to correct the product, but it constitutes the outer panel part of the automobile such as side panel, fender, roof, bonnet, trunk lid, door panel and front pillar outer Parts have three-dimensional curved surfaces and curves, and it is practically impossible to modify products. In the case of automobile metal sheet assembly, if the product is twisted or distorted, it is difficult to connect with other parts, and it becomes impossible to provide a high-quality metal sheet structure for automobiles. The product accuracy could not be maintained.

  To solve the above problem, convert the downward linear motion of the upper mold into a rotational motion and rotate the rotating cam to form the molded part that entered the lower mold from the downward trajectory in the linear direction of the upper mold. The following configuration has been proposed in order to rotate and retract the rotating cam until the molded workpiece can be taken out from the lower die.

  As shown in FIGS. 15 to 21, the negative angle forming die includes a lower die 102 for placing a metal thin plate workpiece W on a support portion 101 and a workpiece W that is lowered in a linear direction with respect to the lower die 102. The upper mold 103 is formed by colliding with each other to form the workpiece W. The upper mold 103 has an opening on the outer peripheral surface and has a groove 104 engraved in the axial direction. An intrusion forming portion 105 that has entered from the locus is formed, and includes a rotary cam 106 that is rotatably provided on the lower mold 102 and an intrusion forming portion 107, and is slidable on the upper die 103 so as to face the rotation cam 106. The rotary cam 106 is rotated and retracted until the workpiece W can be removed from the lower mold 102 after the molding. A work W placed on the support portion 101 of the lower die 102, which is composed of an air cylinder 109 provided in the lower die 102, is formed by an entrance molding portion 105 of the rotary cam 106 and an entrance molding portion 107 of the slide cam 108. The slide cam 108 slides to form the workpiece W. After the molding, the rotary cam 106 is rotated and retracted by the air cylinder 109 so that the molded workpiece W can be taken out from the lower mold 102.

The operation of this negative angle mold will be described in (1) to (7).
(1) As shown in FIG. 15, the upper mold 103 is located at the top dead center, and the workpiece W is placed on the support portion 101 of the lower mold 102 at that time. At this time, the rotating cam 106 is rotated backward by the air cylinder 109.
(2) Next, as shown in FIG. 16, the rotating cam 106 is formed by the air cylinder 109. The upper mold 103 starts to descend, and the pad 110 presses the work W placed on the support portion 101 of the lower mold 102.
(3) Subsequently, the upper mold 103 is lowered, and the lower surface of the slide cam 108 abuts against the rotating plate 111 without the slide cam 108 interfering with the entering molding portion 105 of the rotary cam 106 as shown in FIG. Touch.
(4) When the upper mold 103 continues to descend, the slide cam 108 urged from the outer side of the mold moves to the left in the lateral direction by the action of the cam against the urging force of the coil spring 112. Then, the state shown in FIG. 18 is obtained, and the workpiece W is intruded by the intrusion forming portion 105 of the rotary cam 106 and the intrusion forming portion 107 of the slide cam 108.
(5) After intrusion molding, the upper mold 103 starts to rise as shown in FIG.
(6) The slide cam 108 is urged toward the outside of the mold by the coil spring 112 and moves to the right in FIG. 19 and moves up without interfering with the workpiece W that has been formed.
(7) On the other hand, when the slide cam 108 is raised and the rotating cam 106 is rotated rightward in FIG. 20 by the air cylinder 109, when the workpiece W is taken out from the lower mold 102, the workpiece W is rotated. It can be taken out without interfering with the intrusion forming part 105 of 106. As described above, the air cylinder 109 is necessary in order to return the rotating cam 106 to take out the formed workpiece W from the lower mold 102 after the intrusion forming.

  However, if the intrusion forming part of the workpiece W has a U-shaped groove 121 shown in FIG. 21, there is a problem in that it interferes with the rotating cam 106 that rotates and retracts after the intrusion forming and the U-shaped groove 121 of the workpiece W. there were.

Therefore, conventionally, the lower side of the U-shaped cross section 121 is formed on the hypotenuse 122 in order to avoid the interference.
JP 2005-28370 A (particularly FIGS. 9 to 14)

  Accordingly, an object of the present invention is to provide a negative angle forming die in which the rotating cam that rotates and retracts and the substantially U-shaped groove of the workpiece do not interfere even if the workpiece has a substantially U-shaped groove. .

(Invention of Claim 1)
In the present invention, the workpiece placed on the lower mold side support portion is formed by the rotary cam intrusion forming portion and the slide cam intrusion forming portion, and after the formation, the rotation cam is rotated and retracted to form. In the negative angle mold that allows the workpiece to be removed from the lower mold, the rotating cam is formed by the inner rotating cam and the inner rotating cam having the same axial length as that of the inner rotating cam. An intrusion forming portion is configured, and the rotation center position of the outer rotation cam and the inner rotation cam is shifted so that the rotation retreat locus of the intrusion forming portion of the inner rotation cam and the workpiece do not interfere with each other.
(Invention of Claim 2)
The present invention relates to the invention described in claim 1, wherein the inner peripheral surface of the outer rotary cam and the outer peripheral surface of the inner rotary cam are slidable.
(Invention of Claim 3)
The present invention relates to the invention according to claim 1 or 2, wherein the outer rotating cam and the inner rotating cam are respectively rotatable by an air cylinder.
(Invention of Claim 4)
The present invention relates to the invention described in claim 1 or 2, wherein a plurality of types of intrusion forming portions of the inner rotating cam and corresponding intrusion forming portions of the slide cam are provided.
(Invention of Claim 5)
The present invention relates to the invention described in claim 4 above, and the outer rotating cam and the inner rotating cam are respectively rotatable by an air cylinder or a gas cylinder.

  According to the negative angle forming die of the present invention, even if the workpiece has a substantially U-shaped groove, the rotating cam that rotates and retracts does not interfere with the substantially U-shaped groove of the workpiece.

  Embodiments will be described in detail below as the best mode for carrying out the slide cam mold according to the present invention.

  1 to 4 are longitudinal sectional views showing an outline of the whole of the negative angle mold according to the present invention.

(About the basic structure of this negative angle mold)
As shown in FIGS. 1 to 4, the negative angle forming die of this embodiment is composed of a lower die 1 and an upper die 2, and a workpiece W placed on a support portion 10 on the lower die 1 side is transferred to a rotating cam 3. The forming part 32 and the forming part 21 of the slide cam 20 are formed into a substantially U-shaped cross section, and after the forming, the rotating cam 3 is rotated and retracted so that the formed workpiece W can be taken out from the lower mold 1 side. I am doing so.

  Here, in this negative angle mold, the rotary cam 3 is formed by an outer rotary cam 30 and an inner rotary cam 31 having the same axial length as shown in FIGS. An intrusion forming portion 32 is formed on the distal end side of the inner rotation cam 31, and the rotation center position C 1 of the outer rotation cam 30 and the rotation center position C 2 of the inner rotation cam 31 are formed into the inner rotation cam 31. The position of the part 32 is shifted so as not to interfere with the reciprocating trajectory of the part 32 and the substantially U-shaped groove of the workpiece W.

Reference numeral 4 denotes pressing means, reference numeral 50 denotes an air cylinder for rotating the outer rotating cam 30, reference numeral 51 denotes an air cylinder for rotating the inner rotating cam 31, and reference numeral 60 denotes an integral rotation with the inner rotating cam 31. Reference numeral 61 denotes a rotating plate that moves integrally with the inner rotating cam, and reference numeral 62 denotes a rotating plate that is integrated with the lower mold 1.
(About the operation of this negative angle mold)
This negative angle mold operates as follows.
(1) The upper mold | type 2 is located in the top dead center, and the workpiece | work W is mounted in the support part 10 which the outer side rotation cam 30 comprises at that time (refer FIG. 1). At this time, the outer rotating cam 30 and the inner rotating cam 31 are in the forward position by the air cylinders 50 and 51.
(2) As shown in FIG. 1, the inner rotary cam 31 is in a molding posture by the air cylinder 51. The upper die 2 starts to descend, and the pressing means 4 presses the workpiece W placed on the support portion 10 of the lower die 1.
(3) The upper mold 2 is lowered, and the lower surface of the slide cam 20 does not interfere with the intrusion forming portion 32 of the inner rotary cam 31 as shown in FIG. Abut.
(4) When the upper mold 2 continues to descend, the slide cam 20 biased in the outer direction of the mold moves to the left in the lateral direction by the action of the cam against the biasing force of the coil spring 4. Then, the state shown in FIG. 2 is obtained, and the workpiece W is intruded by the intrusion forming portion 32 of the inner rotary cam 31 and the intrusion forming portion 21 of the slide cam 20.
(5) After intrusion molding, the upper mold 2 starts to rise as shown in FIG.
(6) The slide cam 20 is urged toward the outside of the mold by the coil spring 4, moves to the right, and rises without interfering with the intruded workpiece W.
(7) On the other hand, the slide cam 20 is raised, and the inner rotating cam 31 is rotated rightward in FIG. 3 by the air cylinder 51, and when the workpiece W is taken out from the lower mold 1 of the intrusion formed, the workpiece W rotates inward. It can be taken out without interfering with the intrusion forming part 32 of the cam 31 (even if the shape of the workpiece W after forming is as indicated by reference numeral 121 in FIG. 21, according to this negative angle forming die, the intrusion forming part of the inner rotating cam 31 32 without interfering with 32). This forms an intrusion forming portion 32 at the distal end side of the inner rotation cam 31, and the rotation center position of the outer rotation cam 30 and the rotation center position C <b> 2 of the inner rotation cam 31 enter the inner rotation cam 31. This is because the reciprocating locus of the forming portion 32 and the substantially W-shaped groove of the workpiece W are displaced so as not to interfere with each other.
(8) When the inner rotary cam 30 is moved backward by the air cylinder 50, the workpiece W can be easily removed from the support portion 10.

FIG. 5 is a schematic plan view showing a state in which the outer plate portion edge SP of the automobile is set at an appropriate position of the negative angle forming die F, and FIG. 6 is a lower die 1 in the negative angle forming die F and members attached thereto. FIG. 7 is a perspective view of the outer rotating cam 30 with the inner rotating cams 31 and 31 ′ incorporated therein, and FIG. 8 is an exploded perspective view of the outer rotating cam 30 with the inner rotating cams 31 and 31 ′ removed. 9 to 14 are aa sectional view and bb sectional view showing a procedure for negative angle forming of the outer plate portion edge SP by the negative angle forming die F. FIG.
(About the basic structure of this negative angle mold F)
As shown in FIG. 5, the negative angle mold F is different from the first embodiment in the longitudinal direction as shown in FIGS. 11 and 12 with respect to the outer plate portion edge SP of the automobile. Two consecutive negative angle forming portions W1 and W2 are formed at the same time, and as shown in FIGS. 13 and 14, the negative angle forming portions W1 and W2 are simultaneously die-cut.

  In this negative angle forming die F, the basic configuration is that the workpiece W placed on the support portion 10, 10 ′ on the lower die 1 side is formed into the inner rotary cams 31, 31 ′ as shown in FIG. 11. The portions 32 and 32 'and the slide forming portions 21 and 21' of the slide cams 20 and 20 'are formed into a substantially U-shaped cross section, and then the inner rotating cams 31 and 31' as shown in FIGS. Intrusion molding portions 32 and 32 ′ are rotated and retracted so that the molded negative angle molding portions W 1 and W 2 can be taken out from the lower mold 1.

  In order to realize the removal of the negative angle forming portions W1 and W2 from the lower mold 1, as shown in FIGS. 9 to 14, the rotation center position C1 of the outer rotating cam 30, the inner rotating cam 31, and the like. The rotation center positions C2 and C2 'of 31' are prevented from interfering with the rotation and retraction trajectory of the intrusion forming portions 32 and 32 'of the inner rotation cams 31 and 31' and the substantially U-shaped groove of the workpiece W. Misaligned.

(Regarding the specific configuration of this negative angle mold F)
As shown in FIGS. 5 to 14, the lower die 1 of the negative angle forming die F has a lower die body 1 </ b> A having a concave portion 11 in an arc shape in a substantially central longitudinal direction, and is rotatable in the concave portion 11. The outer rotating cams 30 and 30 ′ that are housed and have the rotation center position C 1, the air cylinder 50 that rotationally drives the outer rotating cams 30 and 30 ′ in the forward and reverse directions, and the outer rotating cam 30 are rotatable. Inner rotating cams 31 and 31 ′ that are housed and have rotation center positions C 2 and C 2 ′, third rotating plates 62 and 62 ′ attached to the inner rotating cams 31 and 31 ′, and attached to the outer rotating cam 30 The second rotating plates 61 and 61 ', the first plates 60 and 60' attached to the lower mold 1, and the third rotating plates 62 and 62 'provided upward in the outer mold rotating cam 30 are pushed up. Gas cylinder 52, 52 'and inside Rolling has been enter shaped portion 32 and 32 'provided on the cam 31,31'.

  When the force from the slide cam 20 acts on the third rotation plate 62, the gas cylinders 52 and 52 'are pushed through the third rotation plate 62 in a manner that shortens as shown in FIG. When the force from the slide cam 20 does not act on the third rotation plate 62, as shown in FIG. 10, the third rotation plate 62 is pushed up in an elongated manner.

  Here, the inner rotating cams 31 and 31 ′ provided in the outer mold rotating cam 30 are shaped as shown in FIGS. 7 and 8, and the inner rotating cam 31 is long and the inner rotating cam 31 ′. Is as short. As shown in FIG. 14, the inner rotary cam 31 is a portion for forming a negative angle forming portion W1, and the inner rotary cam 31 'is a portion for forming a negative angle forming portion W2.

  As shown in FIGS. 5 and 14, the upper mold 2 of the negative angle forming mold F includes an upper mold main body 2A that is movable in the vertical direction, and can be moved back and forth from the left and right with respect to the upper mold main body 2A. The slide cam 20 is spring-biased in the direction of the center, and the pressing means 4 is attached to the lower surface side of the upper mold main body 2A.

As shown in FIG. 9, the pressing means 4 does not apply an excessive force to the shaft 40 provided so as to be movable up and down, the pressing portion 41 provided on the lower end side portion of the shaft 40, and the workpiece W. It is comprised from the spring 42 for making it. The holding means 4 'has the same configuration.
(About the operation of this negative angle mold F)
This negative angle mold F acts as follows.
(1) The upper mold | type 2 is located in the top dead center, and the workpiece | work W is mounted in the support parts 10 and 10 'which the outer side rotation cams 30 and 30' comprise at that time (refer FIG. 9). At this time, the outer rotating cams 30 and 30 ′ and the inner rotating cams 31 and 31 ′ are in the forward positions (positions slightly rotated clockwise) by the air cylinder 50 and the gas cylinders 52 and 52 ′. As a result, the second rotating plates 61 and 61 ′ are slightly lifted from the lower mold body 1A, and the third rotating plates 62 and 62 ′ are slightly lifted from the outer rotating cams 30 and 30 ′. ing.
(2) Next, as shown in FIG. 10, the upper die 2 starts to descend, and the pressing means 4, 4 ′ begin to press the work W placed on the support portions 10, 10 ′ of the lower die 1. In this state, the outer rotating cam 30 is rotated counterclockwise by the air cylinder 50, and the second rotating plates 61 and 61 'are in contact with the upper inclined surface of the lower mold body 1A. The pressing means 4, 4 ′ do not act to damage the workpiece W due to the action of the spring 42 (see FIG. 9).
(3) Further, as shown in FIG. 11, when the upper mold 2 is lowered, the slide cams 20 and 20 ′ cause the third rotating plates 62 and 62 ′ to resist the urging force of the gas cylinders 52 and 52 ′. Press against the outer rotating cam 30, 30 '. In this state, the slide cams 20 and 20 ′ move toward the central portion, and two types of negative angle forming are performed by the intrusion forming portions 21 and 21 ′ and the intrusion forming portions 32 and 32 ′ of the inner rotary cams 31 and 31 ′. The parts W1 and W2 are formed at the same time.
(4) When the upper die 2 is raised, as shown in FIG. 12, the slide cams 20 and 20 ′ move from the center to the left side, and the intrusion forming portions 21 and 21 ′ are moved to the inner rotary cam 31. , 31 ′. In this state, the negative angle forming portions W1, W2 are still pressed against the support portions 10, 10 ′.
(5) When the upper mold 2 is further raised, as shown in FIG. 13, the third rotating plates 62 and 62 ′ are rotated clockwise by the urging force of the gas cylinders 52 and 52 ′. The intrusion forming portions 32 and 32 'come out without interfering with the negative angle forming portions W1 and W2.
(6) Further, as shown in FIG. 14, the upper die 2 is raised so that the negative angle forming portions W1, W2 are pressed against the support portions 10, 10 ′, and the air cylinder 50 is The rotating plates 61 and 61 'are rotated clockwise. Thereby, support part 10, 10 'comes out from the negative angle shaping | molding part W1, W2.
(7) From the above, two types of negative angle forming portions W1, W2 continuous in the longitudinal direction are simultaneously formed on the outer plate portion edge SP of the automobile, and after the forming, the negative angle forming portion W1, W2 can be simultaneously punched.
(Other)
In the above embodiment, two types of negative angle forming portions W1 and W2 can be simultaneously formed, and after the forming, the negative angle forming portions W1 and W2 can be simultaneously punched. Three types of negative angle forming portions W1, W2, and W3 may be simultaneously formed, and after the forming, the negative angle forming portions W1, W2, and W3 may be simultaneously die cut.

Sectional drawing which shows the state of the first process at the time of using the negative angle shaping | molding die of Example 1 of this invention. Sectional drawing which shows the 2nd positive state at the time of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the 3rd process in the case of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the last process in the case of using the said negative angle shaping | molding die. FIG. 9 is a schematic plan view showing a state in which an outer plate part edge of an automobile is set at an appropriate position of a negative angle forming die, relating to Example 2 of the present invention. FIG. 3 is a schematic plan view of the negative angle mold with the upper mold, slide cam and pressing means removed. The perspective view of the state which incorporated the inner side rotation cam in the outer side rotation cam. The disassembled perspective view of the state which removed the inner side rotation cam from the outer side rotation cam. Sectional drawing which shows the state of the first process at the time of using this negative angle shaping | molding die. Sectional drawing which shows the state of the 2nd process at the time of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the 3rd process in the case of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the 4th process in the case of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the 5th process in the case of using the said negative angle shaping | molding die. Sectional drawing which shows the state of the 6th process in the case of using the said negative angle shaping | molding die. Sectional drawing of the state of the top dead center of the upper mold | type of the conventional negative angle shaping | molding die which carries out intrusion molding with the conventional negative angle shaping | molding die. FIG. 6 is a longitudinal sectional view of a conventional negative angle forming die in a state in which a rotary cam is in a forming posture by an air cylinder, an upper die is lowered, and a work is pressed with a pad. The longitudinal cross-sectional view of the state which the upper mold | type of the conventional negative angle shaping | molding die descend | falls, contact | abuts to the lower mold | type, and has begun to contact a workpiece | work. The longitudinal cross-sectional view of the state where the upper mold | type of the conventional negative angle shaping | molding die is a bottom dead center. The longitudinal cross-sectional view of the state in which the penetration molding process was completed and the upper mold began to rise in the conventional negative angle mold. The longitudinal cross-sectional view in which the conventional negative angle shaping | molding die encroachs and an upper mold | die raises further, and is in the state of a top dead center. In the conventional U-shaped groove of the workpiece, when the rotating cam returns and rotates, the rotating cam interferes with the workpiece, and when the lower side is changed to the oblique side, the rotating cam does not interfere with the workpiece when the rotating cam returns. Illustration to explain.

Explanation of symbols

W Work C1 Rotation center position C2 Rotation center position 1 Lower mold 1A Lower mold body 10, 10 'Support section 11, 11' Recessed section 2 Upper mold 2A Upper mold body 20, 20 'Slide cam 21, 21' Intrusion molding Part 3 Rotating cam 30, 30 'Outer rotating cam 31, 30' Inner rotating cam 32, 32 'Intrusion molded part 4, 4' Holding means 40, 40 'Shaft 41, 41' Holding part 42, 42 'Spring 50 Air cylinder 52, 52 ′ Gas cylinder 60, 60 ′ First rotating plate 61, 61 ′ Second rotating plate 62, 62 ′ Third rotating plate

Claims (5)

The work placed on the lower mold side support part is formed by the rotary cam intrusion forming part and the slide cam intrusion forming part. In the negative angle mold that can be taken out more, the rotating cam is formed by the outer rotating cam and the inner rotating cam having the same axial length as that of the outer rotating cam. The rotation center position of the outer rotation cam and the inner rotation cam is configured to be displaced so that the rotation retreat locus of the entering molding portion of the inner rotation cam and the workpiece do not interfere with each other. Negative angle mold. The negative angle forming die according to claim 1, wherein the inner peripheral surface of the outer rotary cam and the outer peripheral surface of the inner rotary cam are slidable. The negative angle forming die according to claim 1 or 2, wherein the outer rotating cam and the inner rotating cam are respectively rotatable by an air cylinder. The negative angle forming die according to claim 1 or 2, wherein a plurality of types of intrusion forming portions of the inner rotating cam and corresponding intrusion forming portions of the slide cam are provided. 5. The negative angle forming die according to claim 4, wherein the outer rotating cam and the inner rotating cam are rotatable by an air cylinder or a gas cylinder, respectively.

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