JPS64132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device that allows the length of a clamp mold to be changed depending on the folding width of a worksheet.

[Conventional technology]

A panel made by folding each end of a rectangular worksheet once or twice is called a cabinet.
Used in show cases, vending machines, freezers/refrigerators, air conditioners, computer units, various office machines, etc. To make such a panel, use a coki bender (wipe bender), wing bender (folding machine), or press brake to cut the short side edge of a worksheet (hereinafter simply referred to as the work) into four sides in advance. After bending the part, the workpiece is turned in a plane, and the long side edge is bent by aligning the clamp die with the folding width that matches the inside of the short side bend. For example, as shown in Fig. 17, after bending the edge of one short side 51 of a work 50 (short side W x long side L) into two stages (short side bending), place the work on a handling table on a horizontal surface. Then, rotate the workpiece 180 degrees to bend the other short side 52, then rotate the workpiece 90 degrees and bend the edge of one long side 53 (long side bending), and then rotate the workpiece another 180 degrees. By bending the long side of the other long side 54, the first bending E and the second bending are performed as shown in FIG.
A rectangular product with a width W and a length L was obtained by bending each of the four sides into a U-shape by step bending H.

To perform the above processing, it is possible to prepare a number of clamp dies with different mold lengths and manually change the dies each time the workpiece length changes, but it is also possible to separate the clamp dies. At the same time, combine molds with different lengths, place the necessary number of split clamp molds in a series according to the length of the workpiece, and slide the remaining clamp molds back or reverse them to the rear of the clamp position. A method for automatically changing the mold length has been proposed. For example, JP-A-57-
No. 149026 has corner blocks (corner upper molds) that can slide freely on the left and right sides of the upper mold body, and between both corner blocks there are a number of intermediate blocks (corner upper molds) that can be rotated 180 degrees from the bottom of the upper mold body toward the rear of the ram. After attaching the upper split mold and moving the left and right corner blocks by the same distance by rotating the left and right threaded rods, the required number of intermediate blocks are rotated from the inverted position and inserted between the two corner blocks. A folding mold is disclosed in which the length of the mold can be changed. Separately, at least one of the corner molds attached to the lower end of the ram is attached so as to be able to slide freely in the longitudinal direction of the lower end of the ram, and rotated 180 degrees from the inverted and retracted position at the rear of the ram to the processing position at the lower end of the ram. A large number of split molds are installed in a row of molds, and one corner mold is slid into a predetermined position according to the length of the workpiece, and the other fixed corner mold is inverted and moved to a retracted position. After rotating the required number of split molds by 180 degrees and inserting them,
A bending device that changes the length of the mold by clamping the mold is also known (Japanese Patent Application Laid-Open No. 148021/1983).

[Problem that the invention seeks to solve]

The intermediate block in the above-mentioned Japanese Patent Application Laid-open No. 57-149026 has a reversing drive means consisting of a rack that is raised and lowered by a cylinder and a pinion that meshes with the rack, which not only complicates the control system including hydraulic piping. , the center of the upper die row formed by reversing the intermediate block and the center of the machine (the center of the upper die body) are misaligned, and it is inevitable that an uneven load will be applied to the ram bed during workpiece machining. Furthermore, in the split mold disclosed in JP-A-58-148021, the number of reversals is selected by moving a sliding key provided on the shaft, and the shaft is rotated by 180° to the mold processing position or to the retracted position at the rear of the ram. However, since the split molds engaged with the sliding keys are rotated, the strength of the split mold holding portions is not sufficient, and there is a lack of stability when the split molds are rotated in reverse.

Further, as shown in FIGS. 16 and 17, after the short side of the workpiece 50 is bent in two steps to form a U-shaped cross section, when the long side is bent, the thickness of the worksheet material 2 is calculated from the length of the long side of the upper die. It is necessary to reduce the length of the mold and avoid interference with the rising edge of the short side that was bent first when opening the mold. Usually, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 57-149026, a rotating die is attached to a corner block (corner upper die), and when the ram is raised after machining, the rotating die collides with the bending part of the workpiece due to its own weight. The mold is opened while rotating in a direction to avoid interference. However, the rotating type must be installed so that it can rotate under its own weight.
A gap is created between the corner block and the bending edge side of the rotary die, and this gap forms a slight uneven portion on the workpiece folding line. This uneven portion is not desirable in high-precision machining.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mold length converting device for a bending machine that facilitates mold length conversion and allows accurate bending without uneven parts.

[Means for solving problems]

In order to achieve the above object, the present invention makes the standard clamp mold group a sliding type, the thin wall clamp group a reversible type, and provides a cutting die within the standard clamp mold. That is, the present invention includes a clamp type support beam fixed to the lower end of the ram, and a left and right split type standard clamp type group attached to the lower end surface of the support beam so as to be slidable in opposite directions relative to the center of the bending machine. A fixed type placed opposite to the standard clamp type, a number of thin clamp types reversibly attached to the rear of the lower end surface of the beam at the center of the standard clamp type group, and a number of thin clamp types installed as required depending on the length of the upper mold. a reversing mechanism that leaves a number of thin-walled clamp molds uninverted on the lower end surface of the beam, and inverts and retracts the unnecessary thin-walled clamp molds that are not used for the mold length to the rear; A folding machine having a group of clamp types and a movable type for bending or wing bending the edge of a worksheet held by a fixed type, comprising: a screw rod with left and right screws suspended horizontally at the rear of the beam; a pair of left and right select pawl mechanisms attached to the threaded portion of the screw rod to engage behind any clamp mold of the standard clamp mold group to select the mold length according to the standard clamp mold pitch; and the thin clamp mold. a pair of left and right recesses formed on the back side of the standard clamp type adjacent to the screw rod; a holder supported by the central portion of the screw rod; and a holder supported by the holder and movable between the clamp position and the recess. and a pair of left and right cutting dies that are inserted into the recess to shorten the length of the die when the bending process is completed, and the outermost standard clamp dies 3E, 4E.
Inside, a cylinder for clearance and a cylinder for chijimi are provided respectively, and the rod of each cylinder is commonly inserted into each standard clamp mold, and its tip is uniquely attached to the holder of the cutting mold, while the rod of the cylinder is inserted into the holder of the cutting mold. It is characterized by being fixed from the outside to a standard clamp type in the middle.

When carrying out the present invention, for example, five standard clamp molds each having a width of 100 mm are arranged on the left and right, and
One wide cutting die is installed on each side, and 20 5mm wide thin clamp dies are installed in the center.If all these dies are used, the maximum mold length is 1200mm, and one standard clamp die and one cutting die are used on the left and right. If all thin clamp molds are turned over, the minimum mold length will be 300mm. Therefore, by selecting the number of standard and thin clamp types used, the width can be freely adjusted from a maximum of 1200 mm to a minimum of 300 mm in 5 mm increments. In addition, the work plate thickness is usually 1 to 3
mm, so if the thin clamp type is 5 mm thick,
Since the length of the upper die has a pitch of 2.5 mm at both ends, it is possible to substantially accommodate changes in the length of the workpiece within the above range. Furthermore, by adopting NC control for the operation of the select claw mechanism, reversing mechanism, etc., flexible production can be performed for bending workpieces of different sizes.

〔Example〕

The bending machine or panel former of the present invention automatically bends the four sides of a worksheet upwardly or downwardly at an acute angle or an obtuse angle, or automatically performs a stubble process on the upwardly bent and downwardly bent ends. In the following example, Koki bending will be explained, but it can of course be applied to wing bending.

1 to 3 are a front view, a plan view, and a side view of a bending machine equipped with a clamp type length conversion device, in which 1 is a ram, 2 is a beam provided at the lower end of the ram 1, and 3A to 3E are shown. 4A to 4E are left and right standard clamp types, 5 is a fixed type on the bed side, 6 is a movable type, 7A and 7B are cutting dies, 8 is a large number of thin clamp types, and 9 is cut into the lower surface of the support beam 2. T groove,
10 is a select claw mechanism, and 25 is a reversing mechanism.

The lower surface of the beam 2 has a T-groove 9 that slidably supports the clamp dies 3A to 3E and 4A to 4E, and also supports the length holders 2 of the cutting dies 7A and 7B.
3 and 24 are also suspended and supported (Fig. 5, Fig. 6).
Further, in the rear part of the beam 2, there is a left and right screw screw rod 11 in the select pawl mechanism 20.
is supported.

When viewed from the front as shown in Fig. 1, the lower surface of the standard clamp mold is flush with the adjacent standard clamp mold and serves as a clamp action surface, and the front and outside of each mold are
A relief is formed to avoid interference with the rise of the workpiece, and the upper part has a T head 12 that engages with the T groove 9 of the beam, and the back has a select claw 13.
It has a protrusion or recess 14 that engages with.

Inside the outermost standard clamp molds 3E and 4E, a cylinder CY1 for scraping and a cylinder CY2 for scraping are provided, respectively.The rod 15 of cylinder CY1 is passed through each standard clamp mold, and the tip is inserted into the mold holder 23, 24. while fixing the rod 16 of cylinder CY2 to the intermediate standard clamp types 3E, 3D, 3C, 3B, 4.
After passing it through E, 4D, 4C, and 4B, its tip is fixed to each innermost standard clamp mold 3A or 4A. Two selection claw engaging recesses 14 are prepared for each standard clamp type except for the clamp type 3A. i.e. 1 for all standard clamp types.
When the recesses 14 are provided individually, the select claws 13 and 1 are placed in the clamp-type recesses 14 and 14 at symmetrical positions.
When you engage and operate 3, each mold is 100mm wide, so
The mold length can only be changed at a pitch of 200mm. On the other hand, the standard clamp type 3A has one recess,
For other standard clamp types, two recesses are provided at a pitch of 50 mm, and one select claw is placed in the recesses 14, 14 at symmetrical positions on the standard clamp type.
By engaging 3 and 13 and moving them by one mold each, it is possible to select a length of 200 mm pitch, and by engaging one of the select claws 13 with the recess 14 at a position shifted from the left and right standard clamp molds. 50 for the left and right by combining and moving 1/2 at a time
It is possible to select the primary mold length in mm increments of 100 mm pitch. Please note that the center may be misaligned when moving 100mm, but
As shown in Fig. 2, the entire mold is centered by cylinder CY3.

Details of the select pawl mechanism 10 are shown in FIG. FIG. 4 shows a state in which the claw 13 is engaged with the recess 14 of the standard clamp mold 3A. As mentioned above, the left and right screw rod 11 is horizontally suspended along the rear side of the standard clamp type, and can be rotated in forward and reverse directions by the motor 18 at the end of the rod, as shown in FIG. The boss portions of the left and right pawls are screwed into this screw rod 11, and when the pawls are removed, the pawls 13 can be moved inward or outward in the lengthwise direction of the mold by rotating a motor 18. The upper part of the beam 2 is equipped with a cylinder CY4 for external claw engagement. A link 19 is provided at the tip of the piston rod of the cylinder CY4, and this is fixed to the swing shaft 20.
Almost the entire length of the lower side of the swing shaft 20 in the longitudinal direction (excluding the positions of the punching type and thin-walled clamp type) is provided with a protrusion 2.
1 is provided, and this protruding piece 21 is engaged with a notch 22 in the upper piece of the select claw 13. When the claw locking cylinder CY4 is extended from the state shown in FIG. 4, the swing shaft 20 rotates clockwise, thereby rotating the claw tip to the position shown by the chain line and connecting it to the recess 14 of the standard clamp type. This is to release the engagement.

Next, the reversing mechanism 25 will be described. This mechanism is for reversing and rotating a predetermined number of thin-walled clamp molds 8, each of which has a width of 20, for example, 5 mm, arranged side by side, from a clamping position to a retracted (non-use) position.

This mechanism, as shown enlarged in FIGS. 4 and 9 to 11, includes a screw rod 11
A fixed spline cylinder 27 is inserted into the cutting die holder 24 and is non-rotatably supported by an arm 26 led out from behind the right cutting die holder 24, and a fixed spline cylinder 27.
A spline sleeve 28 is rotatably inserted into the cylindrical portion of the spline sleeve 28, a spline shaft 30 supported by a bracket 29 led out from behind the left cutting die holder 23, a gear 31 meshing with the spline sleeve 28, and a beam 2. Rack 32 placed on top of
, a cylinder CY5 for driving the rack, and a pinion 33 that is engaged with the spline shaft 30 and meshes with the rack 32. Each thin clamp type 8
is provided with a spline hole that engages with the spline tube and the spline sleeve.

FIG. 10 shows a state in which all the thin-walled clamp molds 8 are juxtaposed at the same clamping positions as the standard clamp molds (state shown by solid lines in FIGS. 4 and 9). The leftmost thin clamp die 8 is always in contact with the inner surface of the bracket 29 of the left cutting die holder 23,
The rightmost thin clamp die 8 is in contact with the inner surface of the arm 34 of the cutting die holder 23. Next, the rack drive cylinder CY5 is driven toward the approach side, the gear 31 and the spline sleeve 28 are rotated by the rack pinion, and all the thin clamp molds 8 are moved 180 degrees backward as shown by the chain line in FIG. When rotated, it can be reversed to the retracted position as shown in FIG. In addition, when the standard clamp die is moved using the select claw 13 to create a gap between the cutting dies, and then the easy drive cylinder CY5 is driven to the return side, the spline sleeve 2
The thin clamp mold 8 that is engaged with the spline cylinder 27 is aligned with the standard clamp mold, and the other thin clamp molds that are engaged with the spline cylinder 27 on the right side of the boundary 38 remain in the inverted position.

5 to 8 show details of the cutting dies 7A and 7B. The purpose of this cutting die is to reduce the total length of the clamp die row after the bending is completed, thereby making it easier to take out the workpiece.

The cutting dies 7A and 7B are 1/2 the length of one standard clamp die, that is, when the standard clamp die is 100 mm, the length is 50 mm.
Supported by holders 23 and 24 having a width of mm,
They are removably attached to recesses 37, 37 formed on the side surfaces of the standard clamp molds 3A, 4A. The upper part of the holders 23 and 24 is formed with a T head 17 that engages with the T groove 9, and the rear part has a bracket 29 or an arm 26 extending as described above, and a cylinder CY6 for moving the cutting die back and forth is fixed thereto. ing. Further, the cutting die supported in the holders 23 and 24 has a T groove 35 in the front and back direction of the upper surface as shown in FIGS.
It can be inserted into the guide and moved in the front and back direction, and a horizontal groove 36 is provided on the rear surface of the cutting die, which is engaged with the tip head of the piston rod in the cylinder CY6 for forward and backward movement to move it in the lateral direction (mold length direction). It is said to be movable.

Usually, the cylinder CY for chijimi shown in Figure 1 is used.
Due to the return side operation of 3, both punching dies come into contact with the sides of standard clamp dies 3A and 4A, and as shown in Figures 6 and 8,
As shown in Fig. 14, it is advanced by the approach of the forward/reverse cylinder CY6 and is in the clamp position. In addition, when the cylinder CY6 returns, by operating the select claw 13 to move the model closer, as shown in FIGS.
As shown in FIG. 15, it is accommodated in a clamp-type recess 37.

[Function] Next, the function of the above device will be explained based on FIGS. 12 to 15.

We will discuss the case where the short side of the worksheet is bent, and then the long side of 550 mm length is bent. In order to simplify the explanation, from FIG. 12 onward, the cutting die is schematically shown, three standard split-type clamp dies are used on each side, and the beams are not shown.

To determine 550mm, move a 100mm wide standard clamp mold to set 500mm, then
Arrange 10 thin-walled clamp molds with a thickness of 5 mm. Before setting, the left and right cutting dies 7A, 7B are in close contact with each other as shown in FIG. 12, and the thin clamp dies 8 are all in the reversed position.
First, turn off the select pawl 13, rotate the left and right screw rod 11, stop at the position shown in Fig. 12, and reduce the cylinder CY4 for external pawl engagement as shown in Fig. 4. The claw 13 is engaged with the outer recess 14 of the clamp mold 3B, while the right claw 13 is engaged with the inner recess 14 of the clamp mold 4B.

Next, by rotating the screw rod 11 and moving the claws 13, 13 outward from the state shown in Fig. 12 by a distance equal to 25 mm plus the shrinkage of the cylinder CY1 for clearance making, the mold will be cut out as shown in Fig. 13. The gap is 50mm. At this time, the bracket 29 of the cutting die 7A moves 25 mm to the left, and the arm 26 of the cutting die 7B moves to the left.
The spline cylinder 27 supported by is also moved 25 mm to the right. Note that 40 in the figure is the bending center.

Next, the reverse drive cylinder CY5 is driven, and the spline sleeve 28 is rotated by the rack pinions 32, 33 and the gear 31. As the spline tube 27 moves to the right, the boundary 38 also moves to the right, so that the spline sleeve is engaged with the spline sleeve side.
All 10 thin-walled clamp molds 8 rotate 180 degrees,
It is inserted perfectly into the 50 mm opening between the cutting dies, and is aligned with the adjacent cutting dies and standard clamp die (Fig. 11).

Next, drive the select claws 13, 13 to make the gaps between the standard clamp dies 3A, 3B and between 4A, 4B zero, and move the standard clamp dies 3B, 4B inward, between the standard clamp dies 3B, 3C and between 4B, 4C.
If a gap (30 to 40 mm) for inserting the rising side 52a of the workpiece 50 is created between them, the distance between the edges of the clamp dies 3B and 4B is set to 550 mm (FIG. 14).

After doing this, the ram is lowered and the workpiece 50 is
Press near the edge of the paper and bend one long side as shown by the chain line in FIG. After bending, Fig. 15,
As shown in FIGS. 5 and 7, the cutting dies 7A and 7B are held in the recesses 37 and 37 of the clamp dies 3A and 4A, and at the same time, the selection claws are driven and the clamp dies 3
B and 4B are brought to the center to create a large gap between them and the rising edge 52a of the workpiece, and the ram is raised to remove the workpiece. The other long side is also bent in the same manner as before to obtain a product as shown in Figure 16.

〔Effect of the invention〕

As mentioned above, the present invention makes the standard clamp type a split type, and the thin clamp type a reversible type.
Since the innermost standard clamp mold has a cutting die on the side, the mold can be opened without creating uneven parts on the folding line, and can accommodate changes in workpiece length. Since a select claw mechanism is used and a reversing mechanism is used when using a thin-walled clamp type, four-side bending can be performed easily and accurately.

[Brief explanation of drawings]

Fig. 1 is a front view of a clamp-type length conversion device according to the present invention, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 5 is a Similarly, an enlarged sectional view along the - line, FIG. 6 is a sectional view of the cutting die pushed out into the standard clamp die row, FIG. 7 is a perspective view of FIG. 5, FIG. 8 is a perspective view of FIG. 6, and FIG. 9 is a perspective view of FIG. The figure is a sectional view taken along the - line in Figure 2, Figure 10 is an enlarged cross-sectional plan view of the reversing mechanism, and Figure 1 is an enlarged cross-sectional view of the reversing mechanism.
Figure 1 is a cross-sectional plan view of the reversing mechanism in operation, Figures 12 to 15 are schematic front views showing the operation of the clamp type length conversion device, Figure 16 is a perspective view of the completed folded product, and Figure 17. is a perspective view of a worksheet. 1... Ram, 2... Beam, 3A to 3E, 4A
~4E...Standard clamp type, 5...Fixed type, 6...
... Movable mold, 7A, 7B ... Cutting mold, 8 ... Thin clamp mold, 10 ... Select claw mechanism, 11 ... Screw rod, 13 ... Select claw, 14 ... Recess, 20 ... Swing shaft, 23, 24...Holder,
25... Reversing mechanism, 37... Recess, 40... Center of bending, CY1... Cylinder for clearance, CY2
...Cylinder for chijimi.

Claims (1)

[Claims] 1. A clamp-type support beam 2 fixed to the lower end of the ram, and left and right split standard clamps attached to the lower end surface of the support beam 2 so as to be slidable in opposite directions relative to the center of the bending machine. Type groups 3A to 3E,
4A to 4E, a fixed mold 5 disposed opposite to the standard clamp mold, and a large number of thin clamp molds 8 reversibly mounted rearward from the lower end surface of the beam at the center of the standard clamp mold group; A reversing mechanism 25 that leaves a necessary number of thin clamp molds 8 on the lower end surface of the beam in a non-inverted manner according to the length of the upper mold, and reverses and retracts unnecessary thin clamp molds 8 that are not used for the mold length to the rear. , a folding machine having the standard clamp type group or the standard/thin clamp type group and a movable die 6 for bending or wing bending the edge of the worksheet held by the fixed die; Screw rod rod 11 with left and right screws, and the standard clamp type groups 3A to 3E, 4A to 4E
a pair of left and right select pawl mechanisms 10, 10 attached to the threaded portion of the screw rod rod 11 to engage behind any clamp mold to select the mold length according to the standard clamp mold pitch; A pair of left and right recesses 37, 37 formed on the back side of the standard clamp molds 3A, 4A adjacent to the screw rods 8, holders 23, 24 supported at the center portion of the screw rod 11, and holders 23, 24, It has a pair of left and right cutting dies 7A, 7B that are supported and move back and forth between the clamp position and the recesses 37, 37, and are inserted into the recesses to shorten the mold length when the bending process is completed, and Outermost standard clamp type 3E, 4E
Inside, a cylinder CY1 for scraping and a cylinder CY2 for flattening are provided respectively, and the rod 15 of each cylinder CY1 is commonly inserted into each standard clamp mold, and its tip is inserted into the mold holder 23, 2.
4, while rod 16 of cylinder CY2
from the outermost to the middle standard clamp type group 3E, 3
A clamp-type length converting device for a bending machine, characterized in that it passes through C, 3B, 4E, 4C, and 4B, and its tips are fixed to the innermost standard clamp dies 3A and 4A. 2. The select pawl mechanism 10 includes a left and right screw type screw rod 11, a pair of select pawls 13 screwed to the screw rod 11, and a swing shaft 20 horizontally suspended parallel to the screw rod 11. A swing shaft 20 engaged with a notch 22 on the upper side of the select claw
A clamp-type length converting device for a bending machine according to claim 1, comprising a side projecting piece 21 and a cylinder for angularly rotating a swing shaft. 3. The reversing mechanism 25 includes a fixed spline cylinder 27 that is inserted into the screw rod 11 and supported by an arm 26 led out from behind the right cutting die holder 24, and a cylindrical portion of the fixed spline cylinder 27. A spline shaft 3 is supported by a rotatably inserted spline sleeve 28 and a bracket 29 led out from behind the left cutting die holder 23.
0 and the gear 3 that meshes with the spline sleeve 28.
1, a rack 32 placed on the top of the beam 2, a cylinder CY5 for driving the rack, and a spline shaft 3.
0 and meshes with the rack 32.
3. A clamp-type length conversion device for a bending machine according to claim 1, comprising: