JPH0798225B2 - Folding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bending machine for bending the edge of a blank, and in particular, one machine can perform several processes, and moreover, the frame is bent by the force at the time of pressurization. There is no compact bending machine.

(Prior Art and Problems to be Solved by the Invention) Conventionally, when the edge of a metal plate is bent into a U-shape or Z-shape in cross section or hemmed, the edge of a blank cut into a predetermined size is cut. Once it is bent into an L-shaped cross section, this blank is transferred to another machine and the next bending process is performed. When the other edge is bent, the blank is rotated in a plane and the upper die is bent according to the width of the other edge.

For this reason, when molding products with many bent parts,
I couldn't machine the edge of the blank with one machine,
The workability is poor, and automation of bending is difficult.

Further, when the plate material is bent, a springback phenomenon occurs in which the deformation of the plate does not match the target shape, although slightly. The degree of this phenomenon varies depending on the elastic limit, tensile strength, bending radius, bending angle, etc. of the work material. Therefore, in the bending work, extra bending is performed in consideration of the amount of springback according to the working conditions and the physical properties of the work.

Therefore, when the front end edge of the blank is bent by a folding die (also called a folding blade or a wipe die) that moves in a direction substantially perpendicular to the blank holder, the blank is not only vertically oriented but the blank Overbend is performed by pushing further toward the blank holder so that it bends at an acute angle.

A conventional folding machine is shown in FIGS. 7 and 8 (for example, Japanese Utility Model Publication 58-147,62).
(See Publication No. 4).

This folding machine has a C-shaped frame 10 as shown in FIG.
A blank holder 101 and a counter blade 102 are provided at 0, and a folding die 103 is provided on the back surface thereof. As shown in FIG. 8, the mold 103 is configured to rotate around a fulcrum 106 by the hydraulic pressure introduced from the through hole 104 to the rear surface of the piston 105 and further fold it toward the blank holder 101 side. is there. And fine adjustment of this mold 103 is wedge 1
It is designed to be performed by 07,108.

However, this bending machine has a complicated structure and requires a complicated operation to adjust the bending angle, which is disadvantageous in terms of workability and equipment cost, and is also large when the mold is moved in parallel. However, there is a problem in operability as well. Moreover, since a large number of drive sources receive a reaction force from the mold 103 via the positioning wedges 107 and 108, the rigidity is inferior to that when directly fixed to the counter blade 102, which is a rigid member, and the bending accuracy is reduced. Also, the fact that the mold 103 rotates to perform bending processing is also disadvantageous in terms of accuracy such as bending angle.

Especially, since the entire folding machine is a C-shaped frame,
There is a risk that the frame will bend when performing pressure processing, which is disadvantageous in terms of accuracy in terms of structure, and there is also a risk that the size of the entire apparatus will increase.

Therefore, the present invention provides a bending machine which can perform several processes with one machine, can perform desired bending easily and accurately with a simple operation during this process, and has a compact overall shape. That is the purpose.

(Means for Solving the Problem) In order to achieve such an object, the invention according to claim 1 has a bed whose upper surface is a horizontal blank transfer surface, and a ram that can be lifted and lowered with respect to this bed. In a bending machine having a blank holder attached to the ram and a bending die arranged near the blank holder for bending the blank, a standing machine is installed straight above the bed. A flat plate-shaped ram, and a slide body supported by the first drive source along one side surface of the ram and the bed so as to be able to move up and down in a direction orthogonal to the blank carrying surface, and to the slide body. A first bending die, which is a pair of upper and lower wipe wipes, which are arranged in a direction parallel to the blank carrying surface by a provided second driving source, and which are provided above and below the blank carrying surface as a center; And one or more second folding dies provided on the ram for bending the blank in cooperation with the lower die, the second folding die being folded in cooperation with the lower die. It is characterized in that it is configured to be rotatable between a processing position and a non-processing position.

According to a second aspect of the present invention, the second drive source is the first drive source.
The bending die is directly held, and the die holder is inserted into the groove portion of the sliding body, and is inserted between the die holder and the bottom surface of the groove portion, and is always in contact with the rear end of the die holder. It has a tapered plate cam member and an actuator that slides the plate cam member and causes the die holder to project and retract toward the blank holder side.

The invention according to claim 3 is characterized in that the tapered plate cam member has a multi-step taper.

(Operation) In the invention according to claim 1 configured as described above, not only each of the first bending die and the second folding die can independently perform a predetermined bending process, but also the first folding die. Processing can also be performed by a combination of a bending die and a second folding die. For example, in a state in which the second bending die is rotated to the non-working position, the first bending die is used to perform the primary bending work, and then the blank is simply displaced on the blank conveying surface to perform the second folding work. It is possible to perform the secondary processing by the mold, and a plurality of processings can be performed by one machine.

Therefore, a plurality of bending processes can be performed only by moving the blank, and this bending process is also easy, and
Since the blank need only be moved in a straight line, the bending process can be automated.

Also, since the ram is installed upright on the bed,
When performing pressure processing, all the forces act in the vertical direction,
Since a large bending action due to a so-called moment does not work, the ram or the like does not bend and becomes rigid, and accurate machining becomes possible.

In addition, various information about blanks that are sequentially flowed, such as dimensions and shape, bending conditions, work procedures, etc., are stored and NC is stored.
If the control and CNC control are performed, after one bending work is completed, the mold can be immediately knitted to the desired width and proceeded to the next bending process, which enables efficient production of various small quantities. .

According to the second aspect of the present invention, since the long tapered plate cam member is operated by using the actuator to bend the tip of the blank, not only the dimensional accuracy is high, but also a large number of drive units are used. A source is not required and the configuration is simple, which is advantageous in terms of equipment cost, and the entire apparatus is compact.

According to the third aspect of the present invention, since the taper of the tapered plate cam member is multi-staged, in the case where a predetermined amount of movement is secured as compared with a linear taper from the start end to the end, the plate cam member is provided. The entire member can be downsized.

(Example) Hereinafter, one Example of the bending machine of this invention is described.

FIG. 1 is a schematic front view showing an embodiment of a bending machine according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is along line III-III of FIG. A sectional view, FIG. 4 is an enlarged sectional view of an essential part of FIG. 3, FIG. 5 is a sectional view taken along the line VV of FIG. 3, and FIGS. 6 (A) (B) (C) are It is explanatory drawing which shows the process of bending.

The folding machine 1 has a bed 2 whose upper surface is a part of a horizontal blank carrying surface F formed by a belt feeder V and the like, and a flat plate-shaped ram that is vertically movable with respect to the bed 2. 4 and a blank holder 10 attached to this ram 4.

Guide posts 3 and 3 are erected at both ends of the bed 2, and the guide posts 3 and 3 support a ram 4 so that the ram 4 can move up and down. The ram 4 holds the guide posts 3 and 3. Is installed to do. A guide bush 5 is provided on the ram 4 to smoothly slide the guide posts 3 and 3 when moving up and down.

On both sides of this ram 4, a cap 6 covering the top of the ram 4
The piston rod 8 of the driving cylinder C is screwed to the cap 6. Therefore, by operating the driving cylinder C, the ram 4 moves up and down via the piston rod 8 and the cap 6.

The driving cylinder C is supported by a cylinder supporting member 7, and the lower part of the cylinder supporting member 7 is a bed 2.
The lower end is fixed to.

As shown in FIGS. 3 and 4, an upper holder 9 is directly attached to the lower surface of the ram 4, an upper blank holder 10a is provided on the lower surface of the upper holder 9, and a lower blank facing the upper blank holder 10a. The holder 10b is attached to the lower holder 12 on the bed 2. Then, by using the upper blank holder 10a and the lower blank holder 10b, the blank W (first
A blank holder 10 for holding (see FIGS. 6 and 7) is configured.

A first lower mold 11a and a second lower mold 11b are installed on the lower holder 12 in the vicinity of the lower blank holder 10b on the blank transfer surface F. These lower molds 11a and 11b are mounted on the upper holder 9. The first brake mold 14a and the second brake mold 14b, which are the second bending molds 14 for bending the attached long object, are opposed to each other. The first brake mold 14a and the second brake mold 14b are rotatably attached, and drive the brake cylinders 15a and 15b (see FIG. 1) as required to drive them through the rack and pinion mechanisms 16a and 16b. By rotating the shafts 17a and 17b, the shafts 17a and 17b can be rotated between a bending position and a non-processing position in cooperation with the lower molds 11a and 11b.

On the other hand, on the back side of the ram 4, a pair of wipe dies 18a and 18b as the first bending die 18 are provided. This first
The folding die 18 moves up and down in a direction perpendicular to the blank carrying surface F to bend the front end edge of the blank W held by the blank holder 10. This wipe type 18a,
As shown in FIG. 3, 18b are vertically provided around the blank carrying surface F, but the lower one is used for forward bending and the upper one is used for reverse bending.

The wipe dies 18a and 18b are held by die holders 19 and 19, and the die holders 19 and 19 are provided with groove portions 2 formed in the sliding body 20.
It is mounted slidably within 1,21. A plurality of T-grooves 22 (see FIG. 2) are formed on the sliding body 20.
The cross section T attached to the ram 4 and the bed 2 in 22
A character-shaped bar 23 is fitted and is movable in the vertical direction with respect to the blank transfer surface F by a cylinder 24 (hereinafter referred to as B cylinder 24) which is a first drive source for bending work shown in FIG.

In particular, in this embodiment, a drive mechanism 25, which is the second drive source for bending, is provided on the rear end surface of the die holder 19. This drive mechanism 25, as shown in FIG.
A plate cam member 27 having a cam surface 26 formed with a multi-step taper T ₁ T ₂ T ₃ ...

The plate cam member 27 having a multi-step taper is compared with the plate cam member 27 in which the taper changes linearly from the start end to the end, in order to secure a predetermined movement amount, the whole plate cam member is Because it can be downsized.

The front surface of the cam surface 27a of the plate cam member 27 contacts the cam surface 26 of the rear end surface of the die holder 19, and the rear surface 28 contacts the bottom surface of the groove 21 via the spacer 29. This contact is made by providing a spring 32 at the end of a bolt 31 which is inserted through the long hole 30 formed in the plate cam member 27 and by the elastic force of the spring 32. An actuating portion 33 is provided at one end of the plate cam member 27. The actuating portion 33 includes swing arms 34, 34 connected to both ends of the plate cam member 27 and other swing arms 34. Cylinders 35, 35 (hereinafter OB
Cylinder 35), and by driving this OB cylinder 35, the swing arms 34, 34 swing about the fulcrum 36,
The plate cam member 27 is slid to cause the die holder 19 to protrude from the groove 21 of the sliding body 20 to drive the wipe dies 18a and 18b. The adjustment of the parallelism of these wipe types 18a, 18b is
The adjustment screw 37 is used via the spacer 29.

The actuating portions 33 are provided at both ends of the plate cam member 27, and actuate one plate cam member 27 by the OB cylinders 35, 35 to perform overbending processing on the wipe dies 18a, 18b. Is. Similar cylinders 38, 38 are also provided in the operating portion of the wipe type 18b.

Next, the operation will be described.

A case where the front end edge of the blank W is bent inward in three steps as shown in FIG. 6C will be described.

First, the blank W is transported by the belt feeder V or the like on the blank transport surface F based on the blank dimensions and the operation procedure that are input in advance in the program, and the blank holder 10
Sent in. The blank W is positioned by a predetermined positioning means in a state where the front edge of the blank W is projected from the blank holder 10 by a predetermined amount, and the driving cylinder C is moved to the ram 4.
To lower the upper blank holder 10a and the lower blank holder 10b.
Hold this between and.

Next, when the B cylinder 24, which is the first drive source, is operated to raise the wipe mold 18b, the front edge protruding from the blank holder 10 is bent (the state shown in FIG. 6A).

In this case, in this embodiment, the ram 4 and the bed 2 are structurally constructed.
Does not bend. That is, the pressing force of the B cylinder 24 is applied to the wipe die 18a, but this upward force is supported by the upright ram 4 and the bed 2 via the blank W, so that the bending of the C frame shown in FIG. , So-called jaw opening does not occur.

Further, the wipe die 18b tends to be displaced in the direction (the horizontal direction in FIG. 3) away from the blank holder 10 when the bending is performed, but this force is supported by the sliding body 20. In other words, this sliding body 20 is the T of the ram 4 and the bed 2.
Since it slides along the bar 23, even if a horizontal force is applied in FIG. 3, this force only acts between the ram 4 and the bed 2 and the sliding body 20, and the force for bending the ram or the like. Does not act as.

Therefore, the ram 4 or the bed 2 can maintain a constant clearance with the upper die, the lower die, and the wipe die by the force generated during the bending work, and can be bent normally, and the working accuracy is remarkably improved. It will be.

Next, after the wipe die 18b is raised to a predetermined position and the blank W is bent, the OB cylinder 35 is operated according to a program while maintaining the state, and the plate cam member 27 is slid on the slide body 20.
Slide it in the groove 21 of. By this sliding, the plate cam member 27
Project the mold holder 19 from the sliding body 20 and
Is moved in the horizontal direction in FIG. 3, for example. As a result, the front end edge of the blank W is subjected to overbending in consideration of the amount of spring back, and is bent at a predetermined angle.

As described above, in this embodiment, the taper of the plate cam member 27 is used to operate the wipe mold 18b via the mold holder 19 and the position of the wipe mold 18b is adjusted.
The 8b drive system is extremely simple, and the entire device can be made compact, which is advantageous in terms of cost.

Further, the B cylinder 24 is operated to lower the wipe mold 18b once, and then the blank W is projected for a predetermined length, and the B cylinder 24 is operated again to bend the blank W by the wipe mold 18b (FIG. 6). (State shown in (B)). Even in this case, the OB cylinder 35 is operated according to the program while the position of the wipe die 18b is maintained, and the plate cam member 27 is slid as a sliding member.
The die holder 19 is projected from the slide body 20, the wipe die 18b is moved in the horizontal direction, and the front end edge of the blank W is subjected to overbending processing by sliding in the groove 21 of 20.

Similarly, the wipe die 18b is once lowered, the blank W is projected for a predetermined length, and the B cylinder 24 is operated to bend the blank W by the wipe die 18b (the state shown in FIG. 6C). In this case as well, the overbending process is similarly performed.

In this case, since the upper and lower blank holders 10a and 10b are formed with the relief processing, the first bent portion does not hit the blank holder 10 to be deformed.

The processing performed using the wipe type can be performed at either the left or right end of the blank W, and it is not limited to the shape described above, but can be folded into various shapes as shown in FIG. 6 (D). Can be bent.

Next, a case where a brake type is used for bending will be described.

To bend using the brake type, first drive the brake type cylinders 15a, 15b, and then the rack and pinion mechanism 16a, 16b.
The shafts 17a and 17b are rotated via the to set the first brake mold 14a and the second brake mold 14b to the processing position. However, when the brake mold 14a is used, the brake mold 14b is kept in the standby state while being rotated to the non-machining position.

In this state, by lowering the brake mold 14a, W-shaped molding such as the lower surface of the brake mold 14a shown in FIG. 4 or L-shaped molding like the lower surface of the brake mold 14b shown in FIG. 4 can be performed. .

It is also possible to use both the wipe type and the brake type for forming. In other words, by simply moving the blank W in the front-rear direction on the bed 2, it is possible to perform a plurality of bending processes that combine wipe bending and brake bending.

When the processing is completed in this way, the plate cam member 27
It is retracted by the OB cylinder 35 to prepare for the next work.
It should be noted that the retracted position of the plate cam member 27 is preferably changed as appropriate in accordance with the processing conditions of the blank W using a limit switch in order to avoid unnecessary movement.

Further, the B cylinder 24 is operated and the sliding body 20 is also lowered while the retracted position is maintained.

When the bending process is performed in the opposite direction to the above case, the upper wipe mold 18a in FIG. 3 may be used, and the operation in this case is almost the same as that described above. Omit it.

The folding machine described above is an example, and various modifications can be made without departing from the scope of the present invention. For example, the drive source of the wipe type 18a18b is not necessarily the B cylinder 24
Alternatively, it is needless to say that the OB cylinder 35 or the like is not used and a motor or the like may be used, and the number of the brake molds 14 is not limited to two and may be three or more. .

(Effect of the invention) As described above, according to the invention of claim 1, a plurality of bending dies are arranged on the blank carrying surface of a bed, and a plurality of bending processes are performed only by moving the blanks. The bending process is easy, and the automation of the bending process is relatively easy. In addition, the ram is installed upright with respect to the head, and the force of pressure processing acts in the vertical direction,
Bending such as jaw opening does not occur on the ram, etc., and accurate processing is possible. Furthermore, if various information about blanks that are successively flowed, such as dimensions and shape, bending conditions, and work procedures, are stored for NC control and CNC control, immediately after one bending work is completed, Can be knitted to a desired width and can be advanced to the next bending work, and efficient multi-product small-quantity production can be realized.

According to the invention described in claim 2, since the long taper plate cam member is operated by using the actuator to bend the tip of the blank, not only the dimensional accuracy becomes high, but also many dimensional accuracy is obtained. Since the drive source is not required and the configuration is simple, it is advantageous in terms of equipment cost, and the entire apparatus becomes compact.

According to the third aspect of the present invention, since the taper of the tapered plate cam member is multi-staged, when a predetermined amount of movement is ensured in comparison with a linearly tapered one from the start end to the end. The entire plate cam member can be downsized. Moreover, since the long tapered drive member is operated using the OB cylinder to bend the tip of the blank, not only the dimensional accuracy becomes high, but also multiple drive sources are not required and the equipment cost is reduced. Is also advantageous, and the entire device becomes compact. In addition, if various information about blanks that are sequentially flowed, such as dimensions and shape, bending conditions, and work procedures, are stored for NC control and CNC control, the mold is desired immediately after one lifting operation is completed. It can be knitted in the width and proceed to the next bending work, which enables efficient and small-lot production.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of a bending machine according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is along line III-III of FIG. A sectional view, FIG. 4 is an enlarged sectional view of an essential part of FIG. 3, FIG. 5 is a sectional view taken along the line VV of FIG. 3, and FIGS. 6 (A) (B) (C) are FIG. 6 (D) is an explanatory view showing other various bending processes, FIG. 7 is an overall perspective view of a conventional bending machine, and FIG. FIG. 8 is a cross-sectional view showing the main parts of FIG. 7. 1 ... bending machine, 2 ... bed, 4 ... ram, 10 ... blank holder, 11 ... lower die, 14 ... second folding die, 18a, 18b ... wipe type (first folding Bending type), 19 ... Mold holder, 20 ... Sliding body, 24 ... B cylinder (first drive source), 25 ... Drive mechanism (second drive source) 27 ... Plate cam member, 35, 38 ... ... OB cylinder (actuator), F ... Blank transport surface, W ... Blank, T ... Taper.

Claims (3)

[Claims] 1. A bed (2) having a horizontal top surface as a blank transfer surface (F), a ram (4) provided to be movable up and down with respect to the bed (2), and attached to the ram (4). Blank holder (10) and this blank holder (10)
A bending machine having a bending die for bending a blank (W), the plate-shaped ram (4) standing straight above the bed (2). And along one side of this ram (4) and bed (2)
A second drive source (24) supported by a slide body (20) supported by a drive source (24) so as to be vertically movable in a direction orthogonal to the blank carrying surface (F), and provided on the slide body (20). 2
The first fold consisting of a pair of upper and lower wipe dies (18a, 18b) centered on the blank transfer surface (F) and moved in a direction parallel to the blank transfer surface (F) by 5). A bending die (18) and one or a plurality of second bending dies (14) provided on the ram (4) for bending the blank (W) in cooperation with the lower die (11). The second bending die (14) is configured to be rotatable between a bending processing position and a non-processing position in cooperation with the lower mold (11). Bending machine. 2. The second drive source (25) directly holds the first bending die (18), and the groove portion (21) of the sliding body (20).
The mold holder (19) fitted inside and this mold holder (19)
And a bottom surface of the groove portion (21) and a tapered plate cam member (27) which is always in contact with the rear end of the die holder (19), and the plate cam member (27). The bending machine according to claim 1, further comprising an actuator (35, 38) for sliding the mold holder (19) to project and retract the mold holder (19) toward the blank holder (10) side. 3. The bending machine according to claim 2, wherein the tapered plate cam member (27) has a multi-step taper.