JPH0260406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and an apparatus for providing steps near the edge of a workpiece (workpiece material, such as a steel plate or a synthetic resin plate).

(Prior Art) Conventionally, a dedicated grading machine has been used to grade workpieces.

(Problems to be Solved by the Invention) This conventional means employs a dedicated step-up machine, so if it is incorporated into a series of workpiece machining lines, the line becomes long. This method requires operations such as loading, positioning, and unloading the work into the attaching machine, and has the disadvantage of poor work efficiency.

In view of such conventional shortcomings, the present invention utilizes a folding machine to enable the folding machine to perform step and folding continuously. The purpose is to improve work efficiency and shorten the processing line by eliminating the attachment process.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on FIGS. 1 to 9 corresponding to embodiments.

The first invention is a method of continuously grading and folding a workpiece using a continuous folding machine, and first, the wing die 11 is moved relative to the lower die 7 according to the grading dimension. After setting the upper and lower positions, the stepped mold part 8A of the upper mold 8 is made to face the lower mold 7 and the wing mold 11. Next, the ram 5 is moved down to press the workpiece W into the lower mold and the wing mold by the stepped mold section 8A, thereby grading the workpiece W. Next, when this grading is completed, the workpiece W is moved upward to separate the gradation mold part 8A from the workpiece W. Thereafter, the wing die 11 is moved to the same level as the lower die 7, and the workpiece W is sent from the tiering position to the folding position. Next, this time, the bending mold part 8B is opposed to the lower mold 7, and then the ram 5 is moved down again to press the workpiece W with the bending mold part 8B.
Thereafter, the wing beam 9 is rotated to one side to bend the workpiece W to one side.

A second invention relates to an apparatus for carrying out the method, in which an upper mold 8 of a continuous folding machine is provided with a stepped mold part 8A and a folding mold part 8B, and both mold parts 8A are provided. , 8B are configured to alternatively face the workpiece W carried onto the lower mold 7. On the other hand, the wing type 11 provided on the wing beam 9 is made separate from the main body 9b of the wing beam 9, and consists of both and a changing means interposed between them for forcibly changing the vertical position of this wing type 11. It is configured with a level change device.

(Function) Workpiece W carried onto the lower die 7 of the continuous bending machine
First, stepped processing is performed using the stepped mold part 8A,
Thereafter, the workpiece W remains placed on the lower die 7 and is simply moved by a small dimension from the stepped position to the bending position, and then bent by the wing beam 9.

(Example) Next, the apparatus and working method used in the present invention will be explained according to the examples shown in FIGS. 1 to 7. As shown in FIG.
A bed 2 is hung horizontally on the bed 2, a guide (not shown) is provided in the frame above the bed 2, and a plurality of hydraulic cylinders 4 are mounted on the bed 2.
... supports the ram 5 as it moves up and down. The hydraulic cylinders 4 are attached to an upper frame 6 extending between the upper ends of the side frames 1, 1. A lower die 7 is attached to the upper end of the bed, while an upper die 8 serving as a workpiece holder is attached to the lower end of the ram.

The side frames 1, 1 support a shaft 10, which is the center of rotation of the wing beam 9, and a lower die 7 and an upper die 8.
The wing beam 9 is made to be able to rotate around the mold tip, and a wing mold 11 is provided at the upper end of this wing beam 9, and the tips of the piston rods 13 of the wing hydraulic cylinders 12 are pin-jointed at the lower part. There is. Several hydraulic cylinders 12 are arranged at intervals along the longitudinal direction of the wing beam 9.

A wing type 11 level change device 14 is provided on the upper part of the wing beam 9. This level changing device 14 consists of the following configuration. That is, the wing beam 9 is separated into an upper plate 9a and a lower body 9b,
A wedge member 15 whose left and right dimensions are longer than the upper mold 8 is interposed between the two. The upper surface of the wedge member 15 that comes into sliding contact with the lower surface of the upper plate 9a is formed into a front downward slope 16, and correspondingly, the lower surface of the upper plate 9a is formed into a rear upward slope 17 with the same taper. There is. The wedge member 15 is provided in such a manner that it is sandwiched between the upper plate 9a and the lower body 9b in a sandwich-like manner by elastic force. Bolts 18 are implanted from the upper plate 9a toward the lower body 9b at predetermined intervals in the left-right direction of the plate 9a, and bolts 19, 19 are similarly implanted on both left and right sides near the front end of the upper plate 9a, respectively. Springs 20...21, 21 are interposed, and the elasticity of these springs causes the upper plate 9 to
a is always pressed against the wedge member 15, and the wedge member 15 is elastically held between the lower body and the upper plate.

Rear bolt 18 in wedge member 15...
has a structure that penetrates the wedge member 15 vertically, and as shown in FIG. The wedge member 15 is allowed to slide back and forth.

Furthermore, on the front side, the front side bolt 1
9, 19 and springs 21, 21, locking pieces 28 that engage with the front upper edge of the upper plate 9a from the upper end toward the rear at multiple locations in the longitudinal direction (horizontal direction) of the upper plate 9a are integrated. A locking piece 24 having the structure is fixed to the front surface of the upper plate 9a, and a bolt receiving piece 25 is fixed to the front surface of the lower body 9b correspondingly, and a bolt 26 is inserted from this bolt receiving piece 25 toward the locking piece 24. After implantation, the upper plate 9a is pressed against the wedge member 15 by the elasticity of the spring 27.

Hydraulic cylinders 2 are installed in front of the wedge members 15, respectively.
8... piston rods 29... are joined,
By pushing and pulling the piston rods 29..., the wedge member 15 is connected to each spring 20...21,
The lower body 9b and the upper plate 9a are slid back and forth against the elasticity of the lower body 9b and the upper plate 9a, and the height position of the upper plate 9a can be freely changed up and down by the inclined surface 16. Each hydraulic cylinder 28 is NC-controlled and operated so that there is no error in the longitudinal sliding amount over the entire length of the wedge member 15 in the left and right direction. 30...
is a mounting plate for mounting the hydraulic cylinders 28, and is fixed to the front surface of the lower body 9b.

31... is a horizontal movement prevention device of the upper plate 9a,
A cylindrical member 31a raised from the upper surface of the front edge of the lower body 9b
and a bolt 31b that is inserted from above and implanted in the lower body 9b, and a cylindrical member 31a is inserted into a circular hole 32 vertically penetrated through the front edge of the upper plate 9b. The upper plate 9a is prevented from shifting in the front, rear, left and right directions, and only vertical movement is allowed.

The above is the specific structure of the level changing device. Nao 3
Reference numeral 3 designates a connecting intermediate member for fixing the wing mold 11 to the upper plate 9a, and has a recess 33a on the lower surface for accommodating the heads of the rear bolts 18.

Next, the structure of the upper mold 8 will be explained.

In this example, the upper mold 8 includes two mold parts: a mold part for tiering (stepping mold part) 8A and a mold part for bending (bending mold part) 8B. They are arranged with a phase of 90 degrees in the circumferential direction of the upper mold.

In the stepped mold part 8A, a part 8A1 that presses the workpiece W between the lower mold ₇ and a part _8A2 that performs the stepped work W between the wing mold 11 are integrally formed. In other words, the lower surface of this mold part 8A is formed so that the wing mold 11 side is stepped down at the part corresponding to the boundary between the lower mold 7 and the wing mold 11, and the stepped part 8A facing the wing mold 11 ₂ is formed to be lower than the presser part _8A1 facing the lower mold 7. Also, this upper mold 8
The rotary shafts 34, 34 protruding from both ends are supported by the ram 5, and are linked to a drive source (not shown) such as an electric motor or hydraulic cylinder via a transmission device (not shown) such as a gear or belt. The two mold parts 8A and 8B are selectively opposed to the lower mold 7 by forcibly rotating the mold parts 8A and 8B. In addition, the front end of the stepped mold part 8A is formed into an arcuate surface _8A3 centered on the rotation center of the wing beam 9, and after the step process, the end of the workpiece W is subsequently bent to form a radius. It is designed to allow processing to be performed in series.

As for the work order, first, as shown in FIG. 6 A to E, the hydraulic cylinders 28...
By operating the piston rods 29 and moving them in and out appropriately, the wedge member 15 is moved back and forth, and the upper plate 9a is moved up and down against the elasticity of each spring, and the wing mold 11 is moved against the upper surface of the lower mold 7. Set the relative vertical position according to the step method. Next, the workpiece W is carried onto the lower die 7 and set at a predetermined position using a back gauge (not shown) (a). Once the workpiece W is set, the ram 5 is subsequently moved down and the upper die 8 presses the workpiece W. By this pressing, the workpiece W is moved between the stepped mold part 8A and the lower mold part 7.
and the wing die 11, and the stepped part 8A of the stepped mold part 8A is bent so that the stepped part _8A2 side is on the lower side, and the stepped process is performed (b). Once this step is completed, ram 5
is moved upward to release the pressure on the workpiece W to be used as the upper mold, and then the workpiece W is shifted forward or backward as appropriate to match the bending position with the tip of the lower mold 7, and the upper mold 8 is rotated to fold it. Mold part 8B
The wing mold 11 is positioned so as to face the lower mold 7 (c), and the position of the wing mold 11 is further adjusted to the same level as the lower mold 7 by the level changing device 14. After the above work is completed, the ram 5 is moved downward again to press the bending mold part 8B against the workpiece W (d). Next, the wing beam 9 is rotated upward and the workpiece W is bent by the bending mold part 8B. Next, the ram 5 is moved upward again to release the pressure on the workpiece W by the bending die part 8B, the workpiece W is carried out, and the following steps are performed in the same way as before to continuously perform the step and bending process. I do.

By the way, if the arcuate surface _8A3 at the tip of the stepped mold part 8A is used, the folding can be performed without using the bending mold part 8B after the step, as shown in Fig. 7. After completing the steps in step B above,
Subsequently, the wing beam 9 is rotated upward by operating the wing hydraulic cylinders 12.
This rotation of the wing beam 9 causes the wing mold 11 to rotate along the radius of the front end of the stepped mold section 8A, so that the front end of the workpiece W is bent into a radius. When this bending is completed, the wing beam 9 is moved downward and returned to its original position by the wing hydraulic cylinders 12, and then the ram 5 is moved upward, and the upper die 8 releases the pressure on the workpiece and moves it together. Move upward. Thereafter, the workpiece W is carried out and the steps similar to those described above are carried out to perform the stepwise and folding operations continuously.

In this example, to change the stepped dimension, replace another stepped mold part with the required stepped dimension to the upper mold 8, and change the vertical position of the wing mold 11 using the level changing device 14. It is possible to freely obtain a wide variety of stepped dimensions.

Next, FIGS. 8 and 9 show another embodiment of the present invention,
Instead of the upper die 8 in the first embodiment being rotary and having two die parts with different phases in the circumferential direction, the bending die part 8B is fixed to the ram 5 as in the conventional case. In addition, the stepped mold part 8A is provided separately, so that it can correspond to any stepped size without replacing the stepped mold part 8A. Specifically, it is as follows. It is.

The bending mold part 8B is fixed to the lower end of the ram 5 so that its front end is on the same position as the virtual vertical plane passing through the tip of the lower mold 7, as in the conventional continuous bending machine. It also has the function of serving as a presser foot and an upper mold during the bending action by the wing beam 9.

On the other hand, the stepped mold part 8A is parallel to the wing mold part 11 in front of the bending mold part 8B.
It is installed so as to face the. Specifically, the stepped mold part 8A is provided at the lower end of a holding frame 36 whose upper end is pivotally supported on the lower surface of the ram 5 on a horizontal support shaft 35 so as to be able to swing freely in the front and back direction. 36 is configured to be able to be freely changed in position by a hydraulic cylinder 37 provided on the ram 5 into two positions: a substantially vertical hanging position and a forward and upward lifting position. Furthermore, the stepped mold part 8A can be freely adjusted in vertical position and fixed by a hydraulic cylinder 38 attached to the holding frame 36, preferably a cell lock cylinder (in this case, it is composed of a holding frame and a hydraulic cylinder). consists of
It has a structure that can accommodate various differences in stepped dimensions.

Next, the work order of the second embodiment will be explained based on FIG. 9.
is operated to set the vertical position of the wing mold 11 according to the stepped dimension. Next, the workpiece W is placed in the lower mold 7.
Place it on top and set it in place using a back gauge (not shown). Next, the hydraulic cylinder 37 is actuated to change the holding frame 36 from the forward and upward lifting position to the vertical hanging position, and the cell lock cylinder 38 is further actuated to eject the stepped mold part 8A according to the stepped dimension. Adjust withdrawal amount. then ram 5
is moved downward, and the pressing force of this ram presses the workpiece W with both mold parts 8A and 8B. Then, due to this pressing, the work W is clamped between the bending mold part 8B and the lower mold 7, as well as the stepped mold part 8A and the wing mold 11, so that the stepped mold part 8A side is on the lower side. It is bent and stepped (a). When the step-up process is completed, the ram 5 is once raised and the holding frame 36 is lifted and kept at that position. Subsequently, the level change device 14 is operated to raise the wing mold 11 to the same level as the lower mold 7. Thereafter, the workpiece W is moved back and forth appropriately to align the bending position correctly with the tip of the lower die 7, and the ram 5 is moved downward again to press the workpiece W with the bending die part 8B, and then the wing beam 9 is moved to the lower die. Workpiece W is swung upwards around a rotation axis centered on the tip.
Fold (b). Once this bending is complete,
The wing beam 9 is swung downward to return to its original position, and then the ram 5 is moved upward to release the pressure on the workpiece W by the bending mold part 8B, and then the workpiece W is carried out and subjected to a series of steps. After completing the folding process, the steps and the folding process are continued in the same manner as before.

(Effects of the Invention) As can be understood from the detailed description of the embodiments above, the present invention allows the continuous folding machine to perform the step processing and the folding processing in succession, so it is possible to As shown in FIG.
This eliminates the need for dedicated processes such as positioning, which greatly improves work efficiency, and also shortens the processing line, contributing to floor space savings.

Furthermore, the lower die 7 may be moved up and down when performing the step-up process, but by forcibly moving the wing die up and down by mechanical force as in the present invention, the process can be carried out. In addition to improving accuracy, the entire device can be made smaller and more energy efficient, and work efficiency and safety can be greatly improved compared to manually replacing the mold.

Incidentally, as shown in the second embodiment, the stepped mold part 8
If A can be independently changed and fixed in the vertical position, it can accommodate various stepped sizes and can be successfully applied to the needs of the era of high-mix, low-volume production.Also, the stepped mold part 8A can be replaced. Since this is not necessary, there is an effect that step machining of different dimensions can be carried out continuously and efficiently without the need to stop the machining lines running back and forth.

[Brief explanation of drawings]

Figures 1 to 7 show an example of the apparatus and working method used in the present invention. Figure 1 is an enlarged side view of the main part with a partial cutout, and Figure 2 is an enlarged side view of the apparatus with the top and bottom partially cut away. Overall side view, Figures 3 and 4 are partially cutaway sectional views of important parts, Figure 5 is an enlarged side view of the stepped mold part,
6A-6E and FIG. 7 are explanatory diagrams of the operation, FIG. 8 is an enlarged side view of a main part showing another embodiment, and FIGS. 9A and 9B are explanatory diagrams of the operation. Code explanation, 5: Ram, 7: Lower mold, 8: Upper mold, 8
A: Stepping mold part, 8A ₁ : Pressing part, 8A ₂ :
Parts to be stepped, 8A ₃ : Arc surface, 8B: Bending mold part, 9: Wing beam, 9a: Upper plate,
9b: Body, 10: Wing beam rotation axis, 1
1: Wing type, 14: Level change device, 15:
Wedge member, 16: Inclined surface, 17: Inclined surface, 1
8, 19, 26: Bolt, 20, 21, 27: Spring, 22: Long hole, 23: Locking piece, 24: Locking piece, 25: Bolt receiving piece, 28: Hydraulic cylinder, 29: Piston rod, 31: Movement prevention device, 34: Upper die rotation shaft, 35: Lateral support shaft, 3
6: Holding frame, 37: Hydraulic cylinder, W: Work.

Claims (1)

[Claims] 1. The lower mold 7 on the upper surface of the bed and the upper mold 8 at the lower end of the ram hold down the vicinity of the end of the workpiece W, and the wing beam 9 is rotated around the mold tip of the lower mold 7. Therefore, in a continuous folding method for folding a workpiece W, a method for grading plate materials in a continuous folding machine is characterized by comprising the following steps. (i) A step of changing the relative vertical position of the wing mold 11 with respect to the lower mold 7 according to the stepped dimension. (ii) A step in which the stepped mold part 8A of the upper mold 8 is opposed to the lower mold 7 and the wing mold 11. (iii) Move the ram 5 down and place the workpiece W in the stepped mold part 8.
The process of adding steps. (iv) A process of moving the ram 5 upward to separate the stepped mold part 8A from the workpiece W upward. (v) Process of changing the wing mold 11 to the same level as the lower mold 7. (vi) A step in which the bending mold part 8B of the upper mold 8 is opposed to the lower mold 7. (vii) Send the workpiece W from the staging position to the bending position, move the ram 5 down, and fold the bending mold part 8B.
The process of pressing the work W with. (viii) A process of rotating the wing beam 9 to one side and bending the workpiece W to one side. 2 The lower die 7 on the upper surface of the bed and the upper die 8 at the lower end of the ram hold down the vicinity of the edge of the workpiece W, and the edge of the workpiece W can be bent by the wing beam 9 rotating around the tip of the lower die 7. In the bending machine configured as shown in FIG. In addition to being configured so that they can alternatively face each other, the wing type 11 provided on the wing beam 9 is configured separately from the body 9b of the wing beam 9, and is interposed between both 9b and 11. A plate material grading device for a continuous bending machine, characterized in that a level changing device 14 is provided, comprising a changing means for forcibly changing the vertical position of the wing die 11. 3 The stepped mold part 8A is formed in a size corresponding to both of the lower mold 7 and the wing mold 11, and is
The first half of the stepped part 8 has an action surface facing the second half of the pressing part _8A1 , which faces the lower die 7.
3. The plate material grading device in a continuous bending machine according to claim 2, wherein A ₂ is formed in different levels. 4 The stepped mold part 8A is formed in a size that faces only the wing mold 11, and the folding mold part 8
Claim 2, wherein the actuators are arranged side by side in front of B in a manner that they can be freely changed and fixed in position into a working position and a non-working position where they are raised forward and upward, and the amount of protrusion and retraction thereof can be changed. A device for grading plate materials in a continuous bending machine.