JPH08141647A - Bending device - Google Patents

Abstract

PURPOSE: To make unable to generate a clearance between the lower end of a fixing upper die and the upper end of an auxiliary upper die in a case of changing from the fixing upper die to the auxiliary upper die by making the auxiliary upper die in contact closely with the fixing upper die from the back face with a four joints link mechanism in a device of bending a work plate. CONSTITUTION: A lever 44 is installed rotatably on a holding part 15 of a 3rd link 13 to hold an auxiliary upper die 20 installed on a four joints link mechanism 10. The top end of this lever 44 is engaged to a recessing part 57 of the auxiliary upper die 20, a press bar 41 of the rear end of the lever is pressed with the lower end of an action rod 27, the auxiliary upper die 20 is pressed upward and made in contact closely with the lower end of the fixing upper die 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus for bending a work plate into a V-shape, and particularly to a bending apparatus for changing a die from an upper die fixed to a ram to an auxiliary upper die. The present invention relates to a bending device having a joint link mechanism.

[0002]

2. Description of the Related Art A press brake is processed by an upper mold fixed to the lower end of a ram and a lower mold provided on the bed upper surface. The upper mold and the lower mold are exchanged depending on the angle of the V-shape and the plate thickness of the work. Must. This replacement is for the lower mold,
It was carried out by sliding the top and bottom of the bed using a cylinder etc., and the upper mold was manually attached and replaced.
For this reason, the applicant automatically changes the mold from the upper mold fixed to the ram of the press brake to the auxiliary upper mold.
A bending apparatus having a joint link mechanism was invented (Japanese Patent Laid-Open No. 60-29570). In the invention of this Japanese Patent Laid-Open Publication,
The auxiliary upper die provided at the tip of the rotation link of the four-bar linkage by the drive of the actuator (hydraulic cylinder) moves almost parallel to the ram, and comes into close contact with the fixed upper die from the rear surface, and the fixed upper die moves the auxiliary The mold is replaced. On the contrary, in order to replace the auxiliary upper die with the fixed upper die, the actuator rotates the four-node link mechanism in the opposite direction to retract the auxiliary upper die to the retracted position.

[0003]

The bending process of work plate materials has diversified and has advanced into the field of precision bending that does not require rework. In addition, for bending long materials, a processing machine equipped with heavy and wide dies (upper and lower dies) appeared, and ram stroke control was perfected to improve bending accuracy. There is a need to.

By the way, in the above-mentioned Japanese Patent Laid-Open Publication, although it was possible to automatically replace the auxiliary upper mold, after the replacement, between the lower end of the fixed upper mold or the lower end of the ram and the upper pressure receiving portion of the auxiliary upper mold. There is a minute gap. Because of this gap, when performing bending work, the auxiliary mold comes into contact with the work plate material, and this contact pushes up the auxiliary upper mold, and after filling the gap, the auxiliary mold comes from the lower end of the fixed upper mold. The force is transmitted to the upper mold and the bending process is performed. For a work plate that requires a small processing force due to a thin plate or a weak material, bending may already be started when the auxiliary upper die is pushed up, so there is a risk of insufficient bending angle control. was there. An object of the present invention is to solve this problem and to provide a processing device that can replace the ram or the fixed upper mold and the auxiliary upper mold with the auxiliary upper mold while eliminating the gap.

[0005]

In order to achieve the above object, the invention according to claim 1 provides an auxiliary upper die supported by a four-bar linkage mechanism provided on the rear or front surface of a ram and rotated by an actuator. , A processing device in which a fixed upper die is replaced with an auxiliary upper die by moving substantially parallel to the ram and coming into close contact with the fixed upper die provided at the lower end of the ram from the rear surface or the front surface. A holding part formed on a rotary link connected to the driving link and holding the auxiliary upper mold slidably in the vertical direction, and the auxiliary upper mold slightly pushed up by the downward rotating end of the four-bar link mechanism. And a push-up means for bringing the auxiliary upper die into close contact with the lower end of the ram.

According to a second aspect of the present invention, the pushing-up means includes a lever rotatably mounted in a plane orthogonal to the vertical direction of the auxiliary upper die by a pin in a window hole of the holding portion, and a tip of the lever. After the recess formed in the auxiliary upper mold so as to engage, the operating rod connected to the actuator, the push rod provided at the rear end of the lever, and the four-bar link mechanism have finished rotating,
Further, a pin connecting portion with a long hole provided between the operating rod and the rotating link for allowing the movement of the operating rod and pushing up the auxiliary upper die by pushing the push rod at the rear end of the lever downward. It is characterized by being composed of.

According to the invention of claim 3, the pushing-up means is
A lever rotatably mounted in a plane orthogonal to the vertical direction of the auxiliary upper mold by a pin in the window of the holding portion, a recess formed in the auxiliary upper mold so that the tip of the lever engages, and an actuator. After the rotation of the actuating rod connected to the actuator, the spring-biased push rod attached to the driving link of the four-bar linkage, and the four-bar linkage, the actuating rod is allowed to move and the spring is biased. It is characterized by comprising a pin connecting portion with an elongated hole provided between the lower end of the operating rod and the driving link in order to push up the auxiliary upper die by pushing the formula push rod downward. Further, in the invention of claim 4, the auxiliary upper die is plate-shaped, and a plurality of four-node link mechanisms are provided in a longitudinal direction of the plate-like, and a lower side of two upper and lower link members constituting the four-node link mechanism The link is characterized by being bent upward to avoid interference with the upper side of the auxiliary upper mold.

[0008]

According to the first aspect of the present invention, when the fixed upper die is replaced with the auxiliary upper die, the actuator rotates the 4-node link mechanism to support the 4-link mechanism outside the 4-link mechanism. The auxiliary upper mold thus moved moves substantially parallel to the ram and comes into close contact with the ram or the fixed upper mold. Then, the pushing-up means provided in the holding portion for holding the auxiliary upper die pushes up the auxiliary upper die to bring it into close contact with the lower end of the ram or the fixed upper die. According to the second aspect of the present invention, the operation of pushing the auxiliary upper mold upward further includes moving the rear end of the lever by moving the actuator by the amount of movement of the connecting pin with the long hole after the actuator has finished rotating the four-bar linkage. Press. This pressing causes the lever to rotate, pushing up the auxiliary upper mold and bringing it into close contact with the lower end of the ram. According to the invention of claim 3, after the 4-bar linkage has finished rotating, the spring-biased push rod attached to the drive link is pushed downward by further moving by the amount of movement of the connecting pin with elongated hole to move the lever. Press the rear edge of the.
This pressing causes the lever to rotate, pushing up the auxiliary upper mold and bringing it into close contact with the lower end of the ram. According to the invention of claim 4, when the auxiliary upper mold is moved in a direction of retracting upward from the fixed upper mold, the auxiliary upper mold is attached to the bent portion of the lower link of the rotated four-bar linkage mechanism. The plate-shaped upper edge enters to avoid interference.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1 is an overall side view showing a first embodiment of a bending apparatus. 2 is an enlarged side view of an essential part of FIG. 1, FIG. 3 is an enlarged side view of the auxiliary upper mold in the middle of rotation, and FIG. 4 is an enlarged side view of the auxiliary upper mold in a retracted position. In the illustrated bending apparatus, a fixed upper die (upper center die) 3 is fixed to the lower end of a ram 1 that is moved up and down by driving a main cylinder (not shown). Fixed upper mold 3 and auxiliary upper mold 20 described later
Has a long plate shape in the direction perpendicular to the drawing. A lower mold 4 is provided on the upper surface of the bed 2. This lower mold 4
Has, for example, two types of V grooves 5 and 6 formed therein. One V-groove 5 forms a pair with the fixed upper die 3 to bend the work plate member 80, and the other V-groove 6 forms the auxiliary upper die 20.
Is to be processed in pairs. A hydraulic cylinder, which is an actuator 8, is pin-connected to the rear surface of the ram 1 via a bracket 7.

An operating rod 27 is coaxially provided by a screw at the tip of the piston rod 9 of the actuator 8. The second link forming the four-bar linkage 10 by providing the pin connecting portion 17 with the elongated hole at the lower end of the operating rod 27.
Is connected to the yoke 12a of the link (driving link) 12. A small diameter portion 29 is formed in the middle of the operating rod 27,
Through the compression spring 28 on the outer periphery of the small diameter portion 29,
A fork 30 (FIG. 6) called a frog mata is provided.
The pins 26 provided on the yoke portion 12a of the second link are inserted into both leg portions 31 of the fork 30 facing downward, and the long holes 18 constituting the pin connection portions 17 with long holes are formed near the lower end of the operating rod 27. The pin 26 is formed and inserted in common.

(Construction of the four-bar link mechanism 10) The four-bar link mechanism 10 includes a fixed link 11 which is a first link,
Second link 12 which is a bell crank type driving link
A third link 13 that rotates outward, a hook-shaped fourth link 14 that bends largely downward, and first to fourth pins 21 to 24 that sequentially connect these links. The second link 12 is a yoke 12 for connecting the operating rod.
The third link 13 has a yoke 13a at a portion connected to the second link. Further, the third link (rotating link) 13 has a holding portion 15 for holding the auxiliary upper die slidably in the vertical direction and a support portion 16 for the push-up rod, and, as will be described later, it has four sections. The auxiliary upper mold 20 is pushed slightly upward by the downward turning end of the link mechanism.
Pushing means 4 for bringing the upper end 20a of the ram into close contact with the ram lower end 1a
It has 0.

(Auxiliary upper mold) Holding part 15 of the third link
The auxiliary upper die 20 is slidably held in the vertical direction via a gib 47. The auxiliary upper mold 20, which is held, moves in a posture substantially parallel to the ram 1 while the link mechanism is rotated. Further, a window hole 15a is opened in the holding portion 15 of the third link, and a lever 44 is rotatably provided here using a shaft 25. Tip (working end) 45 of lever 44
Engages with the recess 46 of the auxiliary upper mold 20 (FIG. 2,
5). A push rod 41 is provided at the rear end of the lever 44 so as to project upward. This push rod 41 is the third link 13
It penetrates through the support portion 16 formed to extend further outward, and the spring 42 constantly gives a rising tendency.
The head 43 at the upper end of the push rod 41 is a four-bar linkage mechanism 10.
Is located at a position where it is pressed by the lower end of the operating rod 25 in a state in which it has finished rotating. Adjusting bolts 33 are provided at both ends of the supporting portion 16 and are brought into contact with the lower ends of the leg portions 31 of the fork. Thus, the pushing distance of the auxiliary upper die 20 supported by the holding portion 15 of the third link can be finely adjusted (FIG. 6).

(Push-up means) The push-up means 40 is
The auxiliary upper mold 2 is formed by the pin in the window hole 15a of the holding portion 15.
A lever 44 mounted rotatably in a plane perpendicular to the vertical direction of 0 and the auxiliary upper mold 2 so that the tip of the lever 44 engages.
0, a recess 46 formed in the actuator 8, an operating rod 27 connected to the piston rod 9 of the actuator 8, and the lever 4
4, a push rod 41 provided at the rear end, and the four-bar linkage 1
After the 0 has finished rotating, a long hole provided between the lower part of the operating rod and the four-bar linkage mechanism 10 to further allow the movement of the operating rod 27 to press the push rod 41 at the rear end of the lever 44. And a pin connecting portion 17 with a pin.

The auxiliary upper die 20 has a plate shape, and a plurality of four-node link mechanisms 10 are provided at intervals in the longitudinal direction of the plate shape, and two upper and lower links 12 constituting the four-node link mechanism,
The lower link (fourth link) 14 among the 14 is bent upward to avoid interference with the upper side of the auxiliary upper die 20. A ridge 35 is formed on the lower end 1a of the ram 1,
It is adapted to engage with a notch 38 formed in the upper end 20a of the auxiliary upper die 20 (FIGS. 1 and 4). Further, a step portion 36 is formed in the middle of the auxiliary upper die 20, and a flat surface 37 is formed above the step portion 36, and is in close contact with a vertical flat surface 37 formed on the back surface 34 of the fixed upper die 3. At the same time, the lower end 3 a of the fixed upper die 3 is in contact with the step portion 36.

(Operation) The operation of this embodiment will be described below. In FIG. 1, the auxiliary upper mold 20 is in close contact with the back surface of the fixed upper mold 3, and the protrusion 35 at the lower end of the ram is engaged with the notch 38 of the auxiliary upper mold. And the V groove 6 of the lower die 4 shows a state in which the work plate member 80 is bent at a predetermined angle. In this state, the piston rod 9 of the hydraulic cylinder, which is the actuator 8, extends to rotate the four-node link 10 to the downward rotation end, and the lower end of the operating rod 27 connected to the piston rod 9 moves to the third position. The head 43 of the push rod 41 that is inserted through the protruding portion 16 of the link
The upper end of the auxiliary upper mold is brought into close contact with the lower end of the ram by pushing the auxiliary upper mold 20 upward by pushing the lever 44 in the clockwise direction in the drawing.

When the auxiliary upper die 20 is separated from the state shown in FIG. 1 and is replaced with the fixed upper die 3, first, the piston rod 9 is contracted by the actuator 8 and the pin 25 is moved upward in the elongated hole 18. Due to this movement, the force with which the rear end of the lever 44 is pressed disappears, and the lever 44 is rotated counterclockwise in the figure by the minute angle θ by the biasing force of the spring 28. As a result, the tip of the lever 44 pushes down the auxiliary upper die 20 via the engaging recess 46. Due to this pushing down, the notch 38 of the auxiliary upper die 20 becomes
5 and the stepped portion 36 of the auxiliary upper mold 20 separates from the lower end 3a of the fixed upper mold 3 (FIG. 2).

After that, when the hydraulic cylinder further operates to pull up the piston rod 9, the four-node link mechanism 10 starts to rotate in the counterclockwise direction, and the auxiliary upper die 20 separates from the fixed upper die 3. During this time, the pin 26 is in contact with the lower edge of the elongated hole 18 at the lower part of the operating rod due to the weight of the auxiliary upper mold (FIG. 3). When the rotation is further performed, the auxiliary upper die 20 is in the completely retracted position (FIG. 4). On the contrary, when the fixed upper die 3 is replaced with the auxiliary upper die 20, the operation opposite to the above-described operation is performed. That is, when the hydraulic cylinder pushes down the piston rod 9 from the state of FIG. 4, the four-node link mechanism 10 rotates in the clockwise direction. And auxiliary upper mold 20
Makes a rotational movement while maintaining a posture substantially parallel to the ram 1, and comes into close contact with the fixed upper die 3 from the rear surface.

The operation of the push-up means at the link rotation end will be described in more detail. When the cylinder 8 extends, the tip of the operating rod 27 presses the rear end of the lever 44 via the push rod 41. By this pressing, the tip of the push rod 41 pushes the auxiliary upper die 20 upward. While the auxiliary upper die 20 pushed up slides with respect to the holding portion 15 of the third link, the notch 38 at the upper end engages with the protrusion 35 at the lower end of the ram. At the same time, the stepped portion 36 of the auxiliary upper die 20 is fixed to the fixed upper die 3
Touches the lower end 3a of the. Whether the fixed upper mold 3 is used (FIG. 4) or the auxiliary upper mold 20 is used (FIG. 1,
According to 2), the lower mold 9 is also shifted in the horizontal direction, and any one of the two V grooves 5 and 6 is used.

As described above, this embodiment has the following effects. That is, in the state where the fixed upper mold 3 is replaced with the auxiliary upper mold 20, the lever 4
4 pushes the auxiliary upper mold 20 upward, so that the notch 38 at the upper end of the auxiliary upper mold 20 not only engages with the protrusion 35 at the lower end of the ram 1, but also fixes the step portion 36 of the auxiliary upper mold 20. Since it is in contact with the tip 3a of the upper die 3, there is no gap between the auxiliary upper die 20 and the ram 1 or the fixed upper die 3. Therefore, during the bending process, there is no movement to fill the gap, and it is possible to prevent the gap portion from being damaged. Further, even when a work requiring a small processing force is processed, the processing force is immediately transmitted from the ram 1 to the auxiliary upper mold 20 via the lower end of the fixed upper mold 3 and the step portion 36 of the auxiliary upper mold 20. The bending angle is sufficiently controlled. Furthermore, by bending the fourth link 14 upward and avoiding interference with the auxiliary upper mold 20,
A large auxiliary upper mold 20 can be adopted.

(Second Embodiment) In the above-described first embodiment, the third link 13 constituting the four-bar linkage mechanism 10 is described.
Supported the push rod on the second link (primary link)
A second embodiment in which a pressing member including a spring-biased push rod is supported on the outer side of will be described in detail.

(Structure of 4-bar Link Mechanism 50) The 4-bar link mechanism 50 of this embodiment has a fixed link 51 which is a first link and a second link which is a bell crank type driving link.
Link 52 and a third link 53 that rotates outside,
A hook-shaped fourth link 54 which bends largely downward,
It is composed of first to fourth pins 61 to 64 connecting these links. The second link 52 has a yoke 512a for connecting the actuating rod, and the third link 53 has a yoke 53a at a portion connected to the second link. Also, the third
Link (rotating link) 53 has a window hole lever for holding the auxiliary upper die slidably in the vertical direction, and
As will be described later, the upper upper part 20 of the auxiliary upper mold 20 is pushed up by pushing the auxiliary upper mold slightly upward at the downward rotation end of the four-bar linkage.
A push-up means 40 for bringing a into close contact with the ram lower end 1a is provided.

The pushing-up means 55 of this embodiment uses the pin 63 in the window hole of the holding portion 55 for holding the auxiliary upper die formed in the third link 53 of the four-bar linkage 50.
Lever 66 rotatably mounted in a plane orthogonal to the vertical direction of the pressing member 7 and the pressing member 7 mounted outside the second link 52.
5 (FIGS. 7-9). The lever 66 is commonly supported by the third link pin 63 that connects the third and fourth links 53 and 54. Working end 45 of lever 66
Is engaged with the recess 46 of the auxiliary upper mold 20, and the shaft 67 is provided at the other end.
And the roller 68 is attached.

The pressing member 75 allows the movement of the actuating rod 70 after the push rod 76 biased upward by the spring 77 and the four-bar linkage 50 have finished rotating, and then the second link 52. Spring-loaded push rod 7 attached to
It is composed of a pin connecting portion 73 with an elongated hole provided between the lower end of the operating rod and the second link 52 of the four-bar linkage to press 6 downward. Further, the main body 75a of the pressing member 75 is in the form of a cylinder having an upper opening, and has a push rod passage hole 75b at the bottom. The push rod 76 has upper and lower flanges 78 and 79, and the lower flange 79 is brought into contact with the roller 68 at the end of the lever 66 at the downward pivoting end of the four-bar linkage 50 to push up the auxiliary upper mold 20.

The operating rod 70 has a bifurcated fork shape, a shaft 71 is inserted into the inside of the crotch, and a roller 72 is provided in the upper center. The upper second link 12 is provided with a push rod 76.
Is urged by the compression spring 77. The state where the push rod 76 of the second link 52 on the upper side is inserted into the bifurcated portion of the operating rod 70, that is, the state where the auxiliary upper die 20 is in close contact with the fixed upper die 3 (FIG. 7). 8), the upper end of the push rod 76 is the roller 7
It is configured to contact 2. When such a contact is made, the lower end of the push rod 76 contacts the rear end of the lever 66. A roller 68 is provided at the rear end of the lever 66, and the contact is smoothly performed. Also in this second embodiment, the same effect as the previous embodiment can be obtained.

[0025]

As described above, according to the invention of claim 1, after the auxiliary upper die is brought into close contact with the ram or the fixed upper die, the auxiliary upper die is pushed up by the pushing-up mechanism to the lower end of the ram or the fixed upper die. Since they are in close contact with each other, the force is transmitted without creating a gap. Therefore, when the processing is started and the gap is filled, there is no fear that the gap is damaged unlike the conventional case. In addition, the bending angle is sufficiently controlled even for a work requiring a small processing force.

According to the second and third aspects of the present invention, since the actuator that rotates the four-bar linkage is used as the actuator that operates the push-up mechanism, the number of actuators does not increase and the cost of the apparatus is suppressed. To be Further, according to the invention of claim 4, since the link does not interfere with the auxiliary upper mold, it is not necessary to provide the four-bar link mechanism only at the end of the auxiliary upper mold in the longitudinal direction. It is possible to provide three or more pieces, and to evenly transmit the force during processing.

[Brief description of drawings]

FIG. 1 is an overall side view showing a first embodiment of a folding device of the present invention.

FIG. 2 is an enlarged side view of an essential part showing a state in which an auxiliary upper die in FIG. 1 is slightly pushed down.

FIG. 3 is a side view showing a state in which the auxiliary upper die is being rotated from FIG.

FIG. 4 is a side view showing a state in which the auxiliary upper mold is stopped at the retracted position.

5 is a vertical sectional front view taken along the line AA of FIG.

6 is a vertical cross-sectional front view taken along the line BB of FIG.

FIG. 7 is a side view showing a second embodiment of the present invention.

8 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 9 is a side view showing a state in which the auxiliary upper mold is stationary in the retracted position from FIG.

[Explanation of symbols]

 1 Ram 2 Bed 3 Center Upper Type (Fixed Upper Type) 4 Lower Type 5, 6 V Groove 7 Bracket 8 Cylinder (Actuator) 10,50 4 Bar Link Mechanism 11-14 Link 15 Link 14 Holding Section 16 Link 14 Push Rod Supporting part 17 Pin connecting part with long hole 18 Long hole 20 Auxiliary upper mold 21-24 Connection pin of four-node link 25 Shaft 26 Pin 27 Operating rod 28 Compression spring 29 Small diameter part of operating rod 31 Leg part 33 Adjust bolt 34 Fixing Rear of upper mold 35 Projection of lower end of ram 36 Step of auxiliary upper mold 37 Flat surface of auxiliary upper mold 38 Notch of auxiliary upper mold 40 Pushing means 41 Push rod 42,77 Spring 43 Push rod head 44,66 Lever 45 Lever action end 46 Recess 47 Give 48 Sliding plate 51-54 Link 55 Push-up means 61-65 Pin 67 Lever End shaft 68 Roller 70 Actuating rod 71 Shaft 72 Roller inside actuating rod 73 Pin connection part with long hole 74 Long hole of actuating rod 75 Pushing member 75a Pushing member main body (upper opening cylindrical) 75b Push rod through hole 76 Push rod 77 Spring 78, 79 Flange 80 Workpiece

Claims (4)

[Claims] 1. An auxiliary upper die, which is provided on a rear surface or a front surface of a ram and is supported by a four-bar linkage which is rotated by an actuator, moves substantially parallel to the ram and is fixed to an upper fixed die provided at a lower end of the ram. By closely contacting from the back or front,
In a processing device in which a fixed upper die is replaced with an auxiliary upper die, a holding is formed on a rotary link connected to a drive link of a four-bar linkage and which holds the auxiliary upper die slidably in the vertical direction. And a pushing-up unit that pushes the auxiliary upper die slightly upward at the downward pivoting end of the four-bar linkage so as to bring the auxiliary upper die into close contact with the lower end of the ram. 2. A push-up means assists a lever mounted rotatably in a plane orthogonal to a vertical direction of an auxiliary upper die by a pin in a window hole of the holding portion to engage a tip of the lever. The recess formed in the upper mold, the operating rod connected to the actuator, the push rod provided at the rear end of the lever,
After the joint link mechanism has finished rotating, the movement of the actuating rod is allowed and the push rod at the rear end of the lever is pushed downward to push up the auxiliary upper mold. The bending apparatus according to claim 1, further comprising a pin connecting portion with a long hole provided in the. 3. A pushing-up means assists a lever mounted rotatably in a plane orthogonal to the vertical direction of the auxiliary upper die by a pin in a window hole of the holding portion to engage the tip of the lever. The recess formed in the upper mold, the operating rod connected to the actuator, the pressing member attached to the driving link of the four-bar link mechanism, the spring-biased push rod incorporated in the pressing member, and the four-bar link mechanism. Is installed between the lower end of the operating rod and the driving link in order to push up the auxiliary upper die by pushing down the spring-biased push rod attached to allow the movement of the operating rod. The bending apparatus according to claim 1, further comprising: a pin connecting portion having an elongated hole. 4. The auxiliary upper die is plate-shaped, and a plurality of sets of four-node link mechanisms are provided in the longitudinal direction of the plate-like, and a lower link of two upper and lower links constituting the four-node link mechanism. Is
The bending apparatus according to claim 1, wherein the bending apparatus is bent upward to avoid interference with the upper side of the auxiliary upper die.