JPH0315225Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an adjustment device for a mold holder that holds a mold in a sheet material bending machine such as a press brake that bends a sheet material. More specifically, the present invention relates to an adjustment device that can easily finely adjust the upward or downward curvature of a mold held in a mold holder.

[Prior Art] Conventionally, in press brakes, etc., in which pressure cylinders are installed near both ends of the upper table, the force to resist bending, such as the tensile strength, yield point, and elastic modulus of the workpiece, is This appears as a drag force, which tends to cause the center of the ram to warp upward during bending, and the center of the fixed table to bend upward. For this reason, the finished product is commonly known as a "boat-shaped" finish.
There is still the inherent challenge of becoming

Various devices have been proposed to solve the above problems. A particularly common adjusting device is a wedge adjusting device.

[Problems to be Solved by the Invention] However, the conventional adjusting device has problems in that it is cumbersome to use tools for adjustment, and that it lacks reproducibility due to backlash of screws.

The purpose of the present invention was proposed in order to solve the problem in view of the above circumstances, and it is to provide a mold holder adjustment device that allows adjustment of the mold holder to be performed simply and easily. .

[Means for solving the problem] In order to achieve the above object, the present invention provides an adjustment device for a mold holder that holds a long mold in a sheet material bending machine that bends a sheet material, A plurality of cylinder holes are provided at appropriate intervals in the longitudinal direction of the mold holder supported on the table of the plate bending machine, and the protruding portion of each piston is inserted into each cylinder hole so as to be movable up and down. A fluid passageway is formed in the mold holder that contacts the table and communicates with each cylinder chamber formed between the bottom of each cylinder hole and each piston, and a rod portion is slid into each of the fluid passages. Each freely inserted adjustment member is provided to be finely adjustable in the direction of insertion into and withdrawal from each of the fluid passages, and the pressure inside each cylinder chamber is adjusted by fine adjustment of each adjustment member, The apparatus is configured to adjust the amount of protrusion of the protruding portion of each piston from each cylinder hole to adjust the warpage of the mold held by the mold holder.

[Function] By adopting the adjustment device of the present invention and adjusting the liquid pressure of the liquid supplied to each cylinder chamber, it is possible to easily press the mold holder against upward or downward warpage during processing. It is easy to adjust and can be adjusted even during processing.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, the press brake 1 is composed of an upper frame 3, a lower frame 5, a side frame 7, and the like. The upper frame 3 is provided with a ram 9 that is vertically movable. A plurality of clamps 11 are provided at the lower front of the ram 9. The clamps 11 are provided at appropriate intervals in the longitudinal direction, and form a clamp device 13. An upper mold 17 is removably clamped between the clamp device 13 and an upper mold holder 15. There is.

Further, a fixed table 19 is placed on the upper longitudinal direction of the lower frame 5, and a locking member (not shown) is provided at the rear of the upper surface of the fixed table 19. A lower mold holder 21 is placed and fixed on the fixed table 19. Further, a lower mold 23 is placed on the upper surface of the lower mold holder 21, and the upper surface of the lower mold holder 21 and the lower mold 23 are fixed with a plurality of bolts 25.

A plurality of adjustment devices 27 are provided at appropriate intervals in the longitudinal direction of the lower mold holder 21.

As is clear from FIGS. 2, 3, and 4, the lower mold holder 21 is composed of an upper holder 21A and a lower holder 21B.
A and the lower holder 21B are screwed together with a plurality of bolts 29 and integrated.

A piston 33 is installed in a lower portion from approximately the center of a cylinder hole 31 bored in the lower holder 21B of the lower mold holder 21. The piston 33
The lower part of the cylinder hole 31 is formed into a protruding part that can freely protrude from the cylinder hole 31, and this protruding part is in contact with the fixed table 19. Note that the piston 33 is prevented from coming off by a snap ring 35 fitted into the lower inner circumference of the lower holder 21B.

As is clear from FIG. 3, a cylinder chamber 37 is formed between the piston 33 and the bottom of the cylinder hole 31 (in this embodiment and others, the top is the bottom). In FIG. 3, a first liquid passage 39 is bored upward toward the right side of the cylinder chamber 37, and the first liquid passage 39 and the cylinder chamber 37 are connected to each other.
It is in communication with. Further, the first liquid passage 3
9, and the second
A liquid passage 41 is bored through it. A cylindrical hole 43 is bored in one side of the lower holder 21B, and the hole 43 is concentric with the second liquid passage 41. A hollow cylindrical member 45 is fitted and fixed in the hole 43. Furthermore, an intermediate member 47 is fitted and fixed to the hollow cylindrical member 45, and a hollow cylindrical adjustment member 49 is rotatably supported by the intermediate member 47. The hollow portion of the hollow cylindrical member 45 and the hollow portion of the adjusting member 49 are coaxial, and the adjusting member 49 has a female thread cut into the hollow inner peripheral portion.
An adjusting screw 53 having a rod 51 at its tip is inserted into the hollow part of the adjusting member 49, and the rod 51 at its tip is inserted into the second liquid passage 41, and as shown in FIG. Slide inside left and right. The male thread of the adjustment screw 53 is connected to the adjustment member 4.
Screw into female thread 9.

A key groove 55 is bored in a part of the outer circumference of the adjustment screw 53, and a pin portion at the tip of a bolt 57 screwed from the outside in the radial direction of the hollow cylindrical member 45 is engaged with the key groove 55. , the rotation and sliding distance of the adjustment screw 53 are regulated. A screw hole 59 is formed in one outer end of the adjustment member 49, and by fitting a rod spanner or the like into the screw hole 59 and turning it clockwise or counterclockwise, the adjustment screw 53 can be adjusted as shown in FIG. Slides left and right.

On the other hand, on the other side of the lower holder 21B, a second
A plug 61 for sealing the liquid is screwed onto one end of the liquid passage 41. That is, after the liquid is supplied to the cylinder chamber 37 and the first and second liquid passages 39 and 41, the plug 61 is screwed onto one end of the second liquid passage 41.

To explain the operation of the adjustment device 27, the adjustment member 4
By fitting a rod spanner or the like into the screw hole 59 of No. 9 and turning the adjustment member 49 clockwise using the spanner, the adjustment screw 53 slides to the right in FIG. 3. When the adjusting screw 53 slides to the right, the rod 51 at the tip of the adjusting screw 53 compresses the liquid sealed in the second liquid passage 41. Since the second and first liquid passages 41, 39 and the cylinder chamber 37 are filled with liquid, the piston 33 is pushed downward in FIG. When the piston 33 is pressed downward, the fixed table 19
, the lower mold holder 21 is relatively moved slightly upward. This relative movement of the lower mold holder 21 acts on the lower mold 23 placed on the lower mold holder 21, so that the warp or warp of the workpiece can be corrected. The plurality of adjusting devices 27 are individually adjusted to adjust the amount of movement of each portion of the lower mold holder 21 in the longitudinal direction, thereby adjusting the warping or warping of the workpiece.

In addition, although the above-mentioned Example explained about the lower mold holder, it is also possible to provide the upper mold holder with this adjustment device and to adjust the upper mold holder.

[Effects] As can be understood from the above description of the embodiment, according to the present invention, by finely adjusting each adjustment member 53 to adjust the position of the rod portion 51 with respect to each liquid passage 41, each cylinder can be adjusted. By individually finely adjusting the pressure within the chamber 37, the relative protrusion amount of each piston 33 can be finely adjusted, and the warpage of the mold held by the mold holder can be finely adjusted. That is, according to the present invention, warpage of the mold can be easily adjusted without requiring separate tools.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a press brake according to the present invention. FIG. 2 is an enlarged front view of the lower mold holder. FIG. 3 is a sectional view taken along the - line in FIG. 2. FIG. 4 is a view taken along the arrows in FIG. 3. DESCRIPTION OF SYMBOLS 1...Press brake, 19...Fixed table, 21...Lower mold holder, 23...Lower mold, 27...Adjusting device, 33...Piston, 37
... Cylinder chamber, 49 ... Adjustment member, 53 ... Adjustment screw.

Claims (1)

[Scope of utility model registration request] The table 19 of the sheet material bending machine is an adjustment device for a mold holder 21 that holds a long mold in a sheet material bending machine that bends a sheet material.
A plurality of cylinder holes 31 are provided at appropriate intervals in the longitudinal direction of the mold holder 21 supported by the mold holder 21 , and a protruding portion of each piston 33 installed inside each cylinder hole 31 so as to be movable up and down comes into contact with the table 19 . , fluid passages 41 communicating with each cylinder chamber 37 formed between the bottom of each cylinder hole 31 and each piston 33 are formed in the mold holder 21, and a rod portion 51 is provided in each of the fluid passages 41. Each adjusting member 53 that is slidably inserted is provided so as to be finely adjustable in the direction of insertion into and withdrawal from each of the fluid passages 41. The warpage of the mold held in the mold holder 21 is adjusted by adjusting the pressure of the mold and adjusting the amount of projection of the protruding portion of each piston 33 from each cylinder hole 31. A mold holder adjustment device characterized by: