JPH0824965B2 - Bending machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus applied when bending a pipe material, a bar material or the like.

[0002]

2. Description of the Related Art Conventionally, when bending a work such as a pipe material, for example, with the work set on a pair of swingable dies, the ram is lowered toward an intermediate portion of both swing dies, The bending portion was pressed by a ram to bend the work.

[0003]

In the above bending method, there is a problem in that the bending portion of the workpiece is subjected to a sharp bending action so that the workpiece is abnormally deformed or the bent shape is not uniform. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to flexibly deform a work, and to stabilize and balance the bent shape of the work.

[0004]

A bending apparatus according to a first aspect of the present invention is installed concentrically so as to be horizontally rotatable, and sandwiches a clamped portion of a workpiece which is adjacent to a workpiece. A lower bending die and an upper bending die, each of which has a bending portion that rotates together in a state, a setting member that sets a work on the lower bending die in a horizontal posture, and a lift-up mechanism that raises and lowers the upper bending die. , A structure in which a transmission cam for converting the ascending / descending operation into a horizontal rotation operation and a driven member which is coupled to one of the two bending dies and is horizontally rotated by being driven by the transmission cam are provided.

According to a second aspect of the present invention, in the bending apparatus, the upper bending die is provided with a pressing portion that presses the bending portion of the lower bending die to press the bending portion toward the work when the upper bending die descends. Have a configuration.

In the bending apparatus according to a third aspect of the present invention, the lower bending die is installed at a fixed position, and the bending portion of the lower bending die is curved in an arc surface centering on a rotation center of the lower bending die. Forming a molding surface that has a shape and against which the work piece of the workpiece is pressed, the pressing portion formed on the upper bending die is pressed against the pressure receiving inclined surface formed on the bending portion of the lower bending die, and this pressure receiving inclined surface is formed. It has a structure in which a pressing slope for pressing to the work side is formed, the driven member is coupled to the upper bending die, and the transmission cam is installed so as to be movable up and down.

[0007]

In the bending lowering device of the first aspect, a part of the work set on the lower bending die is sandwiched between the bending portion of the lower bending die and the lowered bending portion of the upper bending die. The driven member is driven by the transmission cam to be horizontally rotated together with the both bending dies, and the portion of the work sandwiched between the both folding portions is horizontally rotated together with both the folding portions to bend the work.

In the bending lowering device of the second aspect, when the both bending portions sandwich a part of the work, the bending portion of the lower bending die is pressed toward the work side by the pressing portion of the upper bending die, and the work is moved by the both folding portions. It is firmly clamped.

In the bending apparatus of claim 3, when the upper bending die is lowered, the clamped portion of the work is sandwiched between the bending portions of both bending dies, and the pressing slope of the pressing portion of the upper bending die is bent downward. The bent portion of the downward bending die is pressed toward the work by being pressed against the pressure receiving slope of the bent portion of the die, and the portion to be pinched of the work is firmly pinched by the both bent portions. When the transmission cam descends in this state, the driven member is pushed by the transmission cam and horizontally rotates with both bending dies, and both folding parts are horizontal with the clamped part of the workpiece being clamped between both bending parts. While being rotated, the workpiece portion of the workpiece is pressed against the forming surface of the bending portion of the downward bending die and is bent and deformed into an arc shape following the forming surface, so that the workpiece is bent.

[0010]

According to the first aspect of the present invention, since the bent portions of the work are horizontally rotated while the clamped portion of the work is clamped by the bent portions, the work is bent and deformed. The work can be flexibly deformed to bend the work into an appropriate shape, and the bent shape of the work can be stabilized to prevent abnormal deformation of the work.

According to the second aspect of the present invention, since the clamping state of the both bent parts with respect to the work can be strengthened by the pressing action of the pressing part when the work is bent, the work is firmly clamped and the work is clamped. The part can be accurately rotated horizontally to accurately bend the work.

According to the third aspect of the present invention, when the work is bent, the work portion of the work is bent and deformed according to the shape of the forming surface while being pressed against the forming surface of the first bending portion. The shape can be optimized and balanced to improve the accuracy of the bending deformation portion of the work.

Further, since the up-and-down motion can be converted into the horizontal rotation motion of the driven member by the transmission cam, the rotation speed of both bending dies during bending can be arbitrarily changed.

Further, after a work set on the lower bending die is clamped by both bending portions of both bending dies, a series of operations for bending and deforming a work portion of the work by horizontally rotating both bending dies is performed. It is possible to precisely proceed to streamline the bending work and efficiently manufacture a product having a stable bent shape.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. The bending apparatus is installed for the purpose of bending a workpiece W (in this example, a square pipe material) such as a pipe material or a bar material into a stable bent shape. In this bending apparatus, the bending apparatus is installed horizontally in a fixed state. Four lift-up cylinders 2 respectively connected to the four corners of the fixed plate having a rectangular plate shape are installed in an upward direction, and a pair of guide plates are provided near both side edges of the fixed plate 1. 3 are erected in parallel.

A bracket 4 is provided at the rear edge of the fixed plate 1.
Is attached to the bracket 4, and an ejection cylinder 5 is attached to the bracket 4.
Are mounted horizontally.

At the tip of the piston rod 5a of the take-out cylinder 5, a cantilever is supported in a state of being horizontally extended slightly above the upper surface of the fixed plate 1 in a direction slightly displaced from the center of the fixed plate 1. A part of the work W is detachably fitted and set, and the set member 6 is directly connected. Workpiece W is a work piece W to be bent
The part between 1 and the base end is set in a horizontal posture while being constrained by the setting member 6.

The set member 6 is made of a square rod material that can be inserted into the square pipe material when the square pipe material is bent, and is inserted into the round pipe material when the round pipe material is bent. It is made of a possible round bar material, and when bending a square bar material, the square bar material is insertable. When bending a round bar material, the round bar material is inserted. Made by possible round pipe material.

A flank 6a is formed near the tip of the setting member 6 so as to prevent interference with the work W during bending. However, when the round pipe material is bent, the set member 6 is used in which a turning portion that can turn in the bending direction is formed near the tip.

One side surface is formed on the upper surface of the fixed plate 1 in parallel with the set member 6, and a escape prevention member 7 for preventing escape behavior of the set member 6 and the restraining portion of the work W during bending is fixed.

A disk-shaped downward bending die 8 on which a work W is placed is installed on the central portion of the fixed plate 1 so as to be horizontally rotatable.

On the upper surface of the lower bending die 8, there is formed a first bending portion 9 to which a clamped portion W2 of the work W, which is adjacent to the work portion W1 on the front end side, is abutted, and ends from the center portion of the lower bending die 8. It is formed so as to protrude along the radial direction over the edge.

The vicinity of the inner end of the first bending portion 9 of the lower bending die 8 is disposed near the tip of the setting member 6, and the center of rotation of the lower bending die 8 is located on the inner end surface of the first bending portion 9. A forming surface 1 that has a shape curved in an arcuate surface centered on a and is sequentially pressed against the workpiece W1 of the work W in accordance with its bending deformation, and defines the bending shape of the workpiece W1 of the work W.
0 is formed. The radius of the molding surface 10 is half the width of the first bent portion 9.

On the outer side surface of the first bent portion 9, there is formed a pressure receiving slope 11 which is slightly inclined from the inner side toward the lower side with respect to the vertical surface, and the inner side surface of the first bent portion 9 is formed into a vertical plane shape. Has been done.

The lower bending die 8 is rotated clockwise from a start position where the first bending portion 9 is in parallel with the setting member 6, and is driven by a return mechanism (not shown) after the bending process to return to the start position. To do.

A clamp plate 12 connected to the tip of the piston rod of each lift-up cylinder 2 is installed above the fixed plate 1 so as to be vertically movable.

A pair of slide members 22 engaged with both guide plates 3 so as to be vertically slidable are fixed near both side edges of the clamp plate 12.

At the center of the clamp plate 12, there is provided a cylindrical cylindrical wall portion 13a and a support portion 13b connected to the lower end of the cylindrical wall portion 13a. A rotatable member 13 supported so as to be horizontally rotatable is installed, and a cylindrical wall portion 13 of the rotatable member 13 is installed.
A column 14 having a fixed lower end is vertically installed in the center of a.

Both ends of the rotatable member 13 are coupled to the cylindrical wall portion 13a at the upper end inside the cylindrical wall portion 13a, and the central portion thereof is coupled to the support column 14. The rotatable member 1 is centered on the rotation center a.
A round rod-shaped driven member 15 that horizontally rotates together with 3 is installed horizontally.

An upper bending die 16 is fixed to the lower end surface of the rotatable member 13 above the lower bending die 8 so as to be concentrically supported so as to be horizontally movable in the same manner.

On the lower surface of the upper bending die 16, the intermediate plate 12 is provided.
Is lowered to a position where it comes in contact with the upper surface of the lower bending die 8 when it is lowered to the lower end, and clamps the processed portion W1 of the work W and the clamped portion W2 ahead of it to the first bending portion 9. A second bent portion 17 is formed so as to project and bend the work portion W1 of the work W in cooperation with the first bending member 9 to cause bending deformation.

On the lower surface of the upper bending die 16, when the clamp plate 12 descends to the lower end, the clamp plate 12 descends to a position in contact with the upper surface of the lower bending die 8 and comes into pressure contact with the pressure receiving slope 11 of the first bending portion 9, and the work W The pinched portion W2 and the first bent portion 9 of the second bent portion 17 are sandwiched between the second bent portion 9 and the second bent portion 17.
The pressing portion 18 that horizontally rotates together with the bending portion 17 is the second
The protrusion 17 is formed in parallel with the bent portion 17.

The side surface of the pressing portion 18 on the side of the second bending portion 17 is inclined at the same inclination angle as the inclination angle of the pressure receiving slope 11 of the first bending portion 9, and when the upper bending die 16 is lowered, the first bending portion 9 is inclined. A pressing slope 19 is formed that is in pressure contact with the pressure receiving slope 11 and presses the first bent portion 9 toward the work W side.
When the pressing slope 19 comes into pressure contact with the pressure receiving slope 11, the first bent portion 9 is pressed toward the work W side, and the work W is clamped by the both bent portions 9 and 17.

When the clamp plate 12 descends to the lower end, the work W is sandwiched between the bending dies 8 and 16, and the second bending portion 17 descends to the outside of the work W and the pressing portion 18 moves to the first bending portion. 9, the clamped portion W2 of the work W is clamped by the both bent portions 9 and 17, and the clamped portion W2 of the work W and the first bent portion 9 are the second bent portion 17 and the pressing portion. It is sandwiched between 18 and.

An elevating plate 20 which is driven by a drive mechanism (not shown) to ascend and descend is horizontally installed above the intermediate plate 10.

A pair of slide members 23 engaged with both guide plates 3 so as to be vertically slidable are fixed to both side edges of the lower surface of the elevating plate 20.

At the center of the lower surface of the elevating plate 20, two transmission cams 24 for converting an ascending / descending operation into a horizontal rotating operation are coupled, and the transmission cam 24 has a twisted curved surface shape twisted from the outer upper side to the inner lower side. And a pair of cam surfaces 24a for pressing the driven member 15 in the horizontal direction by pressingly contacting the driven member 15 when the elevating plate 20 descends.

With the clamp plate 12 lowered, the transmission cam 24 enters into the cylindrical wall portion 13a of the rotatable member 13 and descends while being pressed against the driven member 15.
Is pushed by the transmission cam 24 to be horizontally rotated, and the upper bending die 16 is horizontally rotated clockwise so that the turning operation of the upper bending die 16 is performed via the both bending portions 9 and 17 and the pressing portion 18. The lower bending die 8 is transmitted to the bending die 8 and horizontally rotates clockwise.

In the present embodiment, the cam surface 24a of the transmission cam 24 is formed so that the driven member 15 and the upper bending die 16 horizontally rotate at a constant speed, and the upper bending die 16 presses the second bending portion 17 and the pressing portion during bending. The part 18 rotates from the start position in which the part 18 is parallel to the first bent part 9 and the setting member 6,
After the bending process is completed, it is returned to the start position and rotated by a return mechanism (not shown).

When bending the work W, first,
The workpiece W is set on the lower bending die 8 by the setting member 6 in a state where the clamp plate 12 and the elevating plate 20 are respectively raised to the ascending end and both the bending dies 8 and 16 are rotated to the start position.

Next, when the piston rod of each lifting cylinder 2 is retracted downward to lower the clamp plate 12, the work W is sandwiched between the bending dies 8 and 16, and at the same time, the work W is clamped. The portion W2 is clamped by the first bending portion 9 and the second bending portion 17 pressed by the pressing portion 18 of the upper bending die 16.

In this state, when the transmission cam 24 is lowered together with the elevating plate 20, the driven member 15 is moved by the transmission cam 2.
4, the upper bending die 16 and the lower bending die 9 horizontally rotate clockwise with the clamped portion W2 of the work W being clamped between the folding portions 9 and 17. , The pinched portion W2 of the work W is horizontally rotated while being sandwiched between the bent portions 9 and 17 as the bent portions 9 and 17 are horizontally rotated, and the workpiece W1 of the workpiece W is moved to the first position. While being pressed against the molding surface 11 of the bent portion 9, it bends and deforms into an arc shape following the shape of the molding surface 11.

When the transmission cam 24 descends to the bottom dead center and both the bending dies 8 and 16 turn to the turning ends in the clockwise direction, the bending of the work W is completed, and the work W is bent into, for example, a substantially V shape. It is bent into the desired shape.

When the transmission cam 24 is lifted from the bottom dead center and returned to the top dead center and then the clamp plate 12 is lifted, the clamped state of the work W is released, and the piston rod of the take-out cylinder 5 is released in this state. The processed work W advances along with the set member 6 and advances to the take-out position outside the lower bending die 8.

After the work W is taken out, the piston rod of the take-out cylinder 5 and the setting member 6 retract,
Both bending dies 8 and 16 return to the start position and rotate.

In this example, the configuration as described above allows the pinched portion W2 of the work W to be bent into the bent portions 9 and 17.
Since the work W is bent and deformed by horizontally rotating both the bent portions 9 and 17 while being sandwiched between them, the work W1 of the work is flexibly deformed to bend the work W into an appropriate shape. It is possible to stabilize the bent shape of the work and prevent abnormal deformation of the work.

In addition, when the work W is bent, the holding state of the both bent portions 9 and 17 with respect to the work W can be strengthened by the pressing action of the pressing portion 18, so that the work W
Can be clamped firmly and the clamped portion W2 of the work W can be accurately horizontally rotated to accurately bend the work W.

Further, when the work W is bent, the work W
Since the workpiece W1 is bent and deformed according to the shape of the molding surface 10 while being pressed against the molding surface 10 of the first bending portion 9, the curved shape of the workpiece W1 of the workpiece W is optimized and proportioned. The accuracy of the bending deformation part can be improved.

Further, since the up-and-down movement can be converted into the horizontal rotation movement of the driven member 15 by the transmission cam 24, the rotation speed of both bending dies 8 and 16 during bending can be arbitrarily changed. .

Further, the work W set on the lower bending die 8 is clamped by the both bending portions 9 and 17 of the both bending dies 8 and 16, and then both the bending dies 8 and 16 are horizontally rotated to work W. A series of operations for bending and deforming the processed portion W1 can be properly performed to streamline the bending work, and a product having a stable bent shape can be efficiently manufactured.

Next, the second embodiment of the present invention shown in FIG. 6 will be described. In this embodiment, the transmission cam 24 is fixed to the fixed plate 30 installed in a fixed state in the opposite direction to that of the first embodiment. , The lifting plate 3 above the fixed plate 30.
1 is installed so that it can be moved up and down.

A driven member 15 at the lower end is provided at the center of the elevating plate 31, and the rotatable member 13 is rotatably supported.
And a lower bending die 8 connected to the upper end of the rotatable member 13 and having the first bending portion 9 formed therein, and
A set member on which the work W is set is attached to the elevating plate 31 via a take-out cylinder. A molding surface similar to the molding surface 10 of the first embodiment is formed on the first bent portion 9.

A clamp plate 32, which is lifted and lowered by a lift-up cylinder connected to the lift plate 31, is installed above the lift plate 31, and the clamp plate 32 can be horizontally rotated at the center of the clamp plate 32. An upper bending die 16 supported by the upper bending die 16 is installed, and a second bending portion 17 and a pressing portion 18 are formed on the upper bending die 16.

The work W is set downward by the setting member 8
The clamp plate 32 is lowered in the state in which it is set above so that the clamped portion W2 of the work W is bent into both the bent portions 9 and 17.
When the raising / lowering plate 31 is lowered after being pinched by the driven member 15, the driven member 15 is pushed by the transmission cam 24 and is horizontally rotated while descending together with the bending dies 8 and 17, and the work W is bent at both bending portions 9 and 9. It is bent by the horizontal rotation operation of 17.

Since the other functions and effects of the second embodiment are almost the same as those of the first embodiment, the description thereof will be omitted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a bending apparatus showing a first embodiment of the present invention.

FIG. 2 is a plan view of a main part for explaining a bending process of a work.

FIG. 3 is a front view of a vertical bending die.

FIG. 4 is a view taken along line XX of FIG. 3;

FIG. 5 is a front view illustrating a driving mode of a driven member by a transmission cam.

FIG. 6 is a front view of a bending apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 8 Upper Bending Die 9 First Bending Part 10 Forming Surface 11 Pressure Slope 15 Follower Member 16 Upper Bending Die 17 Second Bending Part 18 Pressing Part 24 Transmission Cam W Work W1 Worked Part W2 Clamped Part

Claims (3)

[Claims] 1. Folding portions are provided which are concentrically installed so as to be horizontally rotatable, respectively, and are jointly rotated with a sandwiched portion of a workpiece adjacent to a workpiece portion being sandwiched therebetween. A lower bending die and an upper bending die, a setting member for setting a work on the lower bending die in a horizontal posture, a lift-up mechanism for raising and lowering the upper bending die, and a transmission cam for converting the raising and lowering operation into a horizontal rotating operation. And a driven member which is coupled to one of the both bending dies and is horizontally rotated by being driven by the transmission cam. 2. The upper bending die is formed with a pressing portion which is pressed against the bending portion of the lower bending die and presses the bending portion toward the work when the upper bending die descends. The bending apparatus according to 1. 3. The lower bending die is installed at a fixed position, and the bending portion of the lower bending die has a shape curved in an arc surface around a rotation center of the lower bending die. A pressing slope that forms a molding surface against which the processed part is pressed, and presses the pressure-increasing slope formed on the bending part of the lower bending mold to press the pressure-increasing slope to the work side on the pressing part formed on the upper bending mold. The bending apparatus according to claim 1, wherein the bending member is connected to the upper bending die, and the transmission cam is installed so as to be movable up and down.