JPS58159924A - Bending device without using die - Google Patents

Abstract

PURPOSE:To bend a continuous rod having various curvature efficiently without using a die by fixing an end of a rod and clamping another end by a moving clamp provided with two pins and giving rotating force to the moving clamp. CONSTITUTION:A part of a rod 5 is clamped by a fixed clamp 8, and another part at a specified distance apart from above-mentioned part is passed between two pins 22, 23 of a pin clamp 9a. The rod 5 is clamped at two points A, B by rotating the pin clamp in the bending direction. A motor 12 is driven, and rotating force is given to the pin clamp 9A through a universal joint 14 and a spline 15. The pin clamp 9A causes no resistance in moving in the direction of X, Y by the action of an X moving stand 18 and a Y moving stand 19, and only uniform bending moment is applied to the rod 5 between the fixed clamp 8 and pin clamp 9A. Consequently, the rod 5 between the two clamps 8, 9A is bent at uniform radius of curvature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moldless bending device, and more particularly to a moldless bending device that bends continuous strips having various curvatures with high efficiency without using a mold. It is.

First, conventional strips (wires with a uniform cross section).

The bending method for rods, tubes, etc. (called strips) will be explained using Figures 1-2.

Figure @1 is a front view showing an example of a conventional strip bending device and the strip bent by the device;
The figure is a front view showing another example of a conventional strip bending device and a strip bent thereby.

In FIG. 1, 2 is a rotary table, 1 is a mold which forms a curved surface 1a having a predetermined curvature and is fixed to the rotary table 2, and 5 is a strip to be bent. In order to bend this strip 5, first grip one end with the clamp 2a of the rotary table 2, attach the other end to the hydraulic cylinder 3,
The rotary table 2 is rotated in the direction of the arrow while applying tension in the direction of the arrow to the strip 5 by the hydraulic cylinder 3.
is wound around mold 1 and bent.

In addition, in FIG. 2, 4 is a curved surface 4a having a predetermined curvature.
The mold 6 in which the roll 6a is rotatably attached is a rotary lever having a center of rotation at the center of curvature of the curved surface 4a.

In order to bend the strip 5, first fix the middle part to the clamp 4b provided on the side of the mold 4, and then bend the strip 5 into the mold 4.
and a roll 6a, and by rotating the rotary lever 6 in the direction of the arrow, the strip 5 is pressed against the curved surface 4a of the mold 4 and bent.

However, the above-described bending method has the following problems when applied to bending a continuous strip having various curvatures, such as a large non-circular coil.

FIG. 3 is a front view showing a large non-circular coil as an example of a continuous strip having various curvatures.

In this figure 3, 7 is the strip 5 (12,6×26
．． It is a large non-circular coil made by continuously winding 8 strips (with a rectangular cross section) in a track shape from the inside to the outside.

In the conventional bending process, four types of molds similar to those shown in Fig. 1 or 2 are used for bending one track.
The roll version required 40 different molds, and the molds had to be replaced each time each part was processed.

Therefore, there were problems in that not only the mold cost was high, but also it took a long time to replace the mold, resulting in poor work efficiency.

The present inventors have developed a moldless bending device that eliminates the drawbacks of the prior art described above and can bend continuous strips with various curvatures with high efficiency without using molds. (Patent #(,3) dated March 77, 1981).

The feature of the moldless bending device that the present inventors developed earlier is that
: A moldless bending device having a movable clamp that is used to clamp other parts of the strip within a predetermined distance from the fixed position, and a movable table that rotates around the movable clamp. It's in the processing equipment.

FIG. 4 is a perspective view showing an example of a moldless bending device previously developed by the present inventors and a strip to be bent by the device.

In this FIG. 4, XY is a plane on which the strip 5 is bent. 8 is fixed to the fixed base 10, and the strip 5
A fixing clamp 9 that fixes a part of the strip 5 clamps another part of the strip 5 that is a predetermined distance away from this fixed position (the strip 5 within this predetermined distance is bent to a constant curvature). A moving clamp 12 having a clamp type 9a is
Worm reduction $13. universal join) 14.
A motor related to a rotational force loading device that applies rotational force to the movable clamp 9 via the spline 15; 16 is a guide for horizontal movement (hereinafter referred to as the X direction) attached to the stand 11; 18 is a horizontal movement guide; 17 is a vertical direction (hereinafter referred to as Y direction) movement guide attached to the X movement table 18;
Reference numeral 19 denotes a Y moving table on which the movable clamp 9 is rotatably attached;
Within the XY plane, horizontal movement guide 16. The vertical movement guide 17 supports it in the X and Y directions almost without resistance. 2o is an air cylinder capable of absorbing the influence of gravity on the Y-direction movement of the Y-moving table 19 by sending compressed air into it from a pressure source (not shown). The fixing base 10. Stand 11. Motor 12. The worm reducer 13 is all fixed to the base 21.

In the moldless bending apparatus configured as described above, first, a part of the strip 5 is clamped by the fixed clamp 8, and the other part is inserted into the clamp mold 9a of the movable clamp 9 and clamped. Next, the motor 12 is driven, and the worm reducer 13. Universal joint 14. Spline 1
A rotational force is applied to the movable clamp 9 via the movable clamp 9. At this time, the movable clamp 9 is moved by the horizontal movement guide 16. X-movement table 18 supported by vertical movement guide 17
．． Due to the action of the X moving table 19, there is almost no resistance to movement in the X and Y directions, so that the fixed clamp 8. Only a uniform bending moment is applied to the strip 5 between the movable clamps 9.

On the other hand, since the strip 5 usually has a uniform cross-sectional shape, stress, and strain relationship in the longitudinal direction, the bending moment and the radius of curvature correspond one to one.

Therefore, the space between the two lamps 8 and 9 is bent into a uniform radius of curvature.

By continuously performing the above bending process, the strip 5 is bent into a non-circular shape.

By the way, the moldless bending apparatus previously developed by the present inventors as described above had the following points that should be further improved.

That is, in FIG. 4, the bending process between the fixed clamp 8 and the movable clamp 9 is completed, the strip 5 is advanced in the direction of the arrow, and the fixed clamp 8. Strip 5 with moving clamp 9
When performing the next bending process by clamping the part, it is necessary to prepare a clamp die 9a that matches the curvature of the part that has already been bent, and to replace the clamp die each time the curvature changes, which may reduce machining efficiency. was there.

The present invention solves the above-mentioned problems, allows continuous strips with various curvatures to be bent with high efficiency without using molds, and can clamp strips with all kinds of curvatures. The object of the present invention is to provide a moldless bending device equipped with a movable clamp capable of performing the following steps.

The present invention is characterized by comprising a fixing clamp for fixing a part of the strip, and two bins for clamping other parts of the strip at a predetermined distance from the fixing position. These include a movable clamp, a rotational force loading device that applies rotational force to the movable clamp, and a bending device.

More specifically, a part of the strip is fixed, and a pin clamp, which is a movable clamp having two pins separated by a predetermined distance from the fixed position and sufficiently smaller than this distance, is rotated in a direction to bend the strip. By doing so, the strip is clamped at two points and a bending moment is applied.This allows strips of any curvature to be clamped without using a mold. It is a moldless bending device that can bend the body to any desired curvature.

The present invention will be explained below with reference to Examples.

FIG. 5 is a perspective view showing a moldless bending device according to an embodiment of the present invention and a strip to be bent by the device (however, the stand on the near side has been removed to make the figure easier to see). ), Figure 6 is a front view showing the details of the pin clamp in Figure 5 and the state in which the strip of curvature radius ratio is clamped, and Figure 7 is the central part of the pin clamp according to Figure 6. The enlarged view of the vicinity, FIG. 8, shows the processed part of the strip and its vicinity, which is used to explain the amount of movement of the center of the pin clamp when a rotational force is applied to the pin clamp according to FIG. 6. It is a schematic diagram.

In FIG. 5, parts with the same numbers as in FIG. 4 are the same parts.

This moldless bending device includes a fixed clamp 8 for fixing a part of the strip 5, and a fixed clamp 8 for clamping other parts of the strip 5 at a predetermined distance from the fixing position. A pin clamp 9A related to a movable clamp in which two pins 22 and 23 are installed on a rotary plate 24 with an interval ts (see Fig. 6) that is sufficiently smaller than the distance, and a motor that provides rotational force to this pin clamp 9A. 12, and an X moving table 18. which supports the pin clamp 9A movably within the XY plane (the plane on which the strip 5 is bent). It has an X moving table 19.

In the moldless bending device configured as described above, a part of the strip 5 is clamped by the fixed clamp 8, and another part separated by a predetermined distance (the part bent to the radius of curvature R in the previous bending process) is Two bottles of pin clamp 9A 22.23
The pin clamp 9A is rotated in a direction to bend the strip 5, thereby clamping the strip 5 at two points A and B.

Next, the motor 12 is driven to perform worm deceleration S13.
! - Niversal join) 14. Rotating force is applied to nine pin clamps via splines 15. At this time, the pin clamp 9A moves the horizontal movement guide 16. X-movement table 18 supported by vertical movement guide 17. Y
Due to the action of the moving stage 19, there is almost no resistance to movement in the X and Y directions, so that the fixed clamp 8. Pin clamp 9 applies only a uniform bending moment to the human body 5.

In this way, both the clamps 8.9 of the strip 5 are bent into a uniform radius of curvature.

The radius of curvature and the movement of the pin clamp 9A when the bent strip 5 is clamped by the pin clamp 9A and the strip 5 is bent to an angle θ by applying rotational force to the pin clamp 9A, as described above. Calculate the amount using Figures 6-8.

In FIG. 6, O is the center of the pin clamp 9A when a straight strip is clamped, that is, the center of the rotational force. The horizontal distance between the centers of the bins 22 and 230 at this time is hI
e Let the vertical distance be h2.

Also, the height of the strip 5 is t1, the radius of both pins 22, 23 is r
shall be.

On the other hand, when clamping the strip 5 bent to the radius of curvature R, the center of the nine pin clamps, that is, the center of rotational force moves from 0 to O'. At this time, the angle of the line connecting both pins 22 and 23 with respect to the vertical is ψ. changes from to ψ.

However, -5h1 ψg=tan -N-...-...(1)2 Also, 4*t2+As in FIG. 6 is given by the following formula.

4=R0r+, t,=l(,r-'+
As =n 7-2 (2) Therefore, using equations (1) and (2), the above ψ can be found as below υ according to the cosine theorem.

・; ψ−・−gi・(4" + ts" 4.:,,...
...(3) 2 t, t.

The point where a line drawn perpendicularly from the center of the bottle 22 and the neutral axis of the strip 5 intersect is P, and the length of PO2 is a.

If the length in cho is C, and the length in oo' is C, then a.

b and c are given by the following equations.

(4) Using these, the angle θ between PO and PO2 is given by the following equation.

a2+b2-c" θ・, -tx-' () ・・・・・・・
...(7)ab Referring to Fig. 8, when the processed portion (length L) of the strip 5 is bent to an angle θ, the radius of curvature R6 and the center of the pin clamp 9A from the point 07. The coordinates X, y in the X and Y directions are given as follows using a, θ, and t obtained above.

RO=L/θ ・・・・・・・・・
(8) Therefore, by driving the motor 12 to apply rotational force to the pin clamp 9A and rotating it by the angle θ, the processed portion has a radius of curvature R8 determined by equation (8).
It is bent into a shape.

By continuously performing the above bending process, the strip 5 can be bent into a non-circular shape without using a mold.

In addition, regarding the movement of the pin clamp 9A in the X and Y directions,
Horizontal movement guide 16. The resistance of the vertical movement guide 17 or the weight of the pin clamp 9A, Y movement table 19, etc. is completely eliminated by the air cylinder 20 (9), (10).
The bending process may be performed using a position control device (not shown) that positions the XvY point shown by the formula.

Furthermore, it goes without saying that if the bending process is performed in a horizontal plane (in this case, the pin clamp moves in a horizontal plane), the air cylinder 20 shown in FIG. 5 is unnecessary.

According to the above-described embodiments, stripes having various curvatures can be clamped by one pin clamp by nine people, so there is no need to prepare different clamp molds depending on the magnitude of the curvature.

Moreover, if the bending process is performed while controlling the movement of the pin clamp 9A in the X and Y directions to a position determined by a formula, the strip 5 can be bent to a uniform curvature.

As explained in detail above, according to the present invention, there is provided a fixing clamp for fixing a part of the strip, and a clamp for clamping other parts of the strip at a predetermined distance from the fixing position. , a movable clamp equipped with two pins, a rotational force loading device that applies a rotational force to the movable clamp, and a movable table that carries the movable clamp are provided, so that it is possible to produce continuous strips with various curvatures. It is possible to provide a moldless bending device that is capable of highly efficient bending without using a mold and is equipped with a movable clamp that can clamp a strip having any curvature.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional strip bending device and a strip bent by the device;
The figure is a front view showing another example of a conventional bending device for strips and the strips bent by the device, and FIG. 3 shows an example of a continuous strip with various curvatures. FIG. 4 is a front view showing a large non-circular coil, and FIG. FIG. 5 is a perspective view (however,
Figure with the front stand removed to make it easier to see)
FIG. 6 is a front view showing details of the pin clamp in FIG. 5 and a state in which a strip with a radius of curvature is clamped;
Fig. 7 is an enlarged view of the vicinity of the center of the pin clamp according to Fig. 6, and Fig. 8 illustrates the amount of movement of the center of the pin clamp when a rotational force is applied to the pin clamp according to Fig. 6. FIG. 2 is a schematic diagram showing the processed portion of the strip and its vicinity. 5... Strip body, 8... Fixed clamp, 9A... Pin clamp, 12... Motor, 18... X moving table, 1
9...Y moving table, 22.23...pin, 24...
Rotating plate. Agent Patent attorney Kosaku Fukuda (and 1 other person) #1 Eye 2 Eye 4 Hana 30 6th Eye 7 Hard

Claims (1)

[Claims] 1. A fixing clamp for fixing a part of the strip, and two pins for clamping other parts of the strip at a predetermined distance from the fixing position. The present invention is characterized in that it has a movable clamp provided with the movable clamp, a rotational force loading device that applies a rotational force to the movable clamp, and a movable table that supports the movable clamp movably within a plane in which the strip is bent. Moldless bending equipment. 2. A fixed clamp that fixes a part of the strip, and a movable clamp equipped with two pins that is used to clamp another part of the strip that is a predetermined distance from the fixed position; a rotational force loading device that applies a rotational force to the movable clamp; and the pavilion-less bending device that bends the movable clamp in a plane in which the strip is bent.