JPS6057929B2 - Numerically controlled pipe bending equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a numerically controlled pipe bending device, and particularly to a device for bending a pipe whose end portion has been previously subjected to drilling, crushing, or other processing.

Traditionally, pipe bending was done entirely by hand.
Using a press machine or numerical control (Numeri)
calControl) type bending equipment (so-called NC
vendor). Of these, those made by hand are inferior in mass production and machining accuracy, while those made by press machines are excellent in mass production, but require the production of bending dies, which increases processing costs. Many numerically controlled hexagonal bevel processing apparatuses have been used that satisfy the properties and can accommodate various shapes without using bending dies. However, the numerically controlled hexagonal bevel processing device is only for bending, and after bending the pipe, in order to process it into the frame of a motorcycle or bicycle, for example, the end of the pipe must be
It is necessary to perform processing such as drilling or crushing.
Since the pipe after the bending process has a two-dimensional or Ξ-dimensional bend, it is not only difficult to handle, but also difficult to handle.
To improve accuracy, positioning molds and equipment are required for pipe processing after bending. Therefore, it has not been possible to expect significant effects such as improvement in mass productivity or cost reduction simply by utilizing numerically controlled hexagonal bevel processing equipment. Therefore, before bending, the end of the pipe is processed by drilling, crushing, etc., and as shown in Fig. 1, a positioning recess 2 is provided on the side of the vibrator 1, and a positioning pin 3 is inserted into the end of the pipe. There is a technique in which the vibrator 1 is positioned, or the seam 4 of the vibrator 1 is positioned by a seam detection means, and the bending process is performed using a numerically controlled bending device.

However, due to the positioning pin 3 and the recess 2, the vibe 1
This positioning requires an extra step of providing the recess 2 in the vibrator 1, and the positioning is performed using the protrusion at the tip of the positioning pin 3, resulting in poor positioning accuracy. In addition, in the case where the positioning is performed by detecting the seam 4, not only a seam detection means is required, but also detection is difficult with a vibrator for edge processing. The present invention solves such conventional technical problems and makes it possible to extremely easily position and bend the vibrator after the end has been subjected to processing such as drilling and crushing, thereby facilitating mass production. The object of the present invention is to provide a numerically controlled vibrator bending device that improves performance, improves processing accuracy, and reduces processing costs.

In order to achieve such an object, the present invention provides a vibrator that has been subjected to processing such as drilling or crushing in advance on the end thereof, and has the end formed into a processed end consisting of a female part or a male part. a bending die that rotates around an axis perpendicular to the axial direction and having a bending surface of the vibrator on its outer periphery; and a clamp that clamps a portion of the vibrator in front of a portion to be bent to the bending die. a die; a pressure die that supports and guides the straight pipe portion of the vibrator; a positioning device that regulates the feeding movement of the vibrator by the feeding means and determines the initial position of the vibrator before bending; The positioning device is configured to move the clamp die to the bend die rather than the clamp position of the vibrator to the bend die! a pedestal supported by the bend die on the lower side in the bending rotation direction;
a drive mechanism that reciprocates between a positioning position facing the processing end of the female part or the male part of the vibrator and a retracted position that allows the feed movement of the vibrator; The present invention is characterized in that it includes a locking end made of a male part or a female part that can be fitted with the processed end made of the female part or male part of the vibrator in a relatively non-rotatable manner at the positioning position.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, in FIG. 2, a cylindrical vibrator 1 to be bent is prepared by subjecting the end thereof to necessary processing such as drilling and crushing. The vibrator is attached to a numerically controlled vibrator bending device 6 having a positioning device 5 according to the present invention, and after being positioned by the positioning device 5, it is bent in the same manner as in the conventional method.

a The numerically controlled vibe bending device 6 includes a base 8 having a rail 7 extending in a straight line, a feeding means 9 that holds the vibe 1 and moves on the rail 7 and is rotatable around the vibe axis, and a base. A header 10 is movable in a direction perpendicular to the rail 7 at the end of the platform 8, and the header 10 has an axis offset from the extension line of the rail 7, is rotatably supported by the header 10, and is rotated by a drive means (not shown). A disk-shaped bend die 11 that is driven, a bend arm 12 that rotates integrally with the bend die 11 and extends outside the bend die 11, and a clamp die 1 that presses and clamps the vibrator 1 against the bend die 11.
3, a pressure die 14 that supports and guides the straight pipe portion of the vibrator 1, and a positioning device 5 that restricts the feeding movement of the vibrator 1 by the feeding means 9 and determines the initial position of the vibrator 1 before bending. Be prepared.

The feeding means 9 consists of a carriage 15 provided with a traveling mechanism, and a chuck 16 provided on the header 10 side of the carriage 15 and gripping one end of the vibrator 1.

A pair of rotating rollers 17 and 18 having rotational axes parallel to the rail 7 are arranged on the base 8 near the header 10, and the vibrator 1 is movably supported on both rotating rollers 17 and 18. A first hydraulic cylinder 19 extending parallel to the moving direction of the header 10 is supported on the base 8 , and a piston rod 20 of this hydraulic cylinder 19 is connected to the header 10 . Therefore, the header 10 is connected to the first hydraulic cylinder 1
By the telescopic drive of the rail 9, it reciprocates in its longitudinal direction, that is, in the direction orthogonal to the rail 7. The front end of the header 10 (
An abutting piece 21 is provided protruding toward the base 8 side (upper end in FIG.
2 is protruded from the base 8. This restricts the header 10 from moving more than necessary due to the extension drive of the first hydraulic cylinder 19. The header 10 includes a second hydraulic cylinder 23
is supported, and the piston rod 24 of the second hydraulic cylinder 23 extends along the direction perpendicular to the rail 7, that is, along the longitudinal direction of the header 10 toward the bend die 11 side.

A pressure die 14 is attached to the tip of the piston rod 24, and this pressure die 14 has a linear mold groove (not shown) for supporting and guiding the straight pipe portion of the vibrator 1 on the surface on the bend die 11 side. It is provided. The rotating shaft 25 of the bend die 11 is pivotally supported by the header 10 on the front side of the pressure die 14, that is, on the left side in FIG.

A groove 26 having a bending surface into which the vibrator 1 is fitted is provided on the outer periphery of the bend die 11.
The side part of the vibrator 1 is fitted into the . The bend arm 12 is provided integrally with the rotating shaft 25 and extends outside the bend die 11.

This bend arm 12 is located in front of the header 10 (to the left in FIG. 2) and approximately parallel to the header 10 before the bending die 11 rotates during bending. A third hydraulic cylinder 27 is supported by the bend arm 12,
The piston rod 28 of the third hydraulic cylinder 27 extends along the longitudinal direction of the bend arm 12 toward the bend die 11 side. A clamp die 13 is attached to the tip of the piston rod 28, and the clamp die 13 presses and clamps the vibrator 1 against the outer periphery of the bend die 11 by the extension drive of the third hydraulic cylinder 27. Referring to FIGS. 3, 4, and 5, the bend arm 12 is equipped with a positioning device 5. As shown in FIG.

This positioning device 5 moves from the end of the bend arm 12 on the bend die 11 side to the bend forming rotation direction 2 of the bend die 11.
The bend arm 12 includes a pedestal 32 supported by the bend arm 12 via a support 31 extending downward from the clamp position 30 along the line 9, and a drive mechanism 50 for swinging the pedestal 32. A downwardly extending bracket 34 is integrally provided at the end of the support base 31, and the vicinity of one end of the receiving base 32 is pivotally supported on the bracket 34 via a support shaft 35. A fourth hydraulic cylinder 33 is supported at the lower part of the support base 31, and the piston rod 3 of this fourth hydraulic cylinder 33
6 is connected to one end of the pedestal 32. Therefore, the fourth
The pedestal 32 swings around the axis of the support shaft 35 by the expansion and contraction drive of the hydraulic cylinder 33 . That is, when the fourth hydraulic cylinder 33 is driven to extend, the pedestal 32 moves to the positioning device in an upright position as shown in FIG. It moves to a retracted position in a horizontal position, which has been rotated approximately 90 degrees. Thus, the fourth hydraulic cylinder 33 and the support shaft 35 are
It constitutes a drive mechanism 50 of the present invention that reciprocates the cradle 32 between the positioning position and the retracted position. A positioning member 37 is fixed to the surface of the vibrator 1 that faces the processed end when the pedestal 32 is in the positioning position.

This positioning member 37 is formed in a shape corresponding to the processed end of the vibrator 1, and has a locking end consisting of a male part or a female part that can be fitted to the processed end in a relatively non-rotatable manner. 6
As shown in the figure, if the processed end of the vibrator 1 is formed into a so-called collar-cut female part 1a, the positioning member 3
7 includes a semi-cylindrical male portion 37a, as shown in FIGS. 6 and 6A. Next, to explain the operation of this embodiment, when bending the vibrator 1, first, after performing necessary processing such as drilling or crushing on the distal end, first the proximal end of the vibrator 1 is bent. is gently gripped by the chuck 16 and placed on rotating rollers 17 and 18.

At this time, in the positioning device 5, the fourth hydraulic cylinder 33 is driven to extend to hold the pedestal 32 in a vertical position as shown in FIG. Therefore, the carriage 15 is moved forward, and with the tip of the vibrator 1, that is, the processed end is in contact with the positioning member 37, the carriage 15 is gently rotated around the axis of the vibrator 1.
The processed end made of the female part 1a of the vibrator 1 is fitted and locked to the locking end made of the male part 37a of the positioning member 37. As a result, the initial position of the vibrator 1 is determined, so the chuck 16 tightens the proximal end of the vibrator 1, and the third drive cylinder 27 is driven to extend, so that the vibrator 1 is attached to the bend die 11 by the clamp die 13. Clamp. Next, the fourth hydraulic cylinder 33 is driven to retract, and the pedestal 3
2 to the retracted position, and the fitted state between the locking end of the positioning member 37 and the processed end of the vibrator 1 is released. Therefore, thereafter, forward movement of the vibrator 1 will not be blocked by the cradle 32. After the positioning operation of the vibrator 1 is completed, the second hydraulic cylinder 23 is driven to extend and the pressure die 14 is brought into contact with the vibrator 1. As a result, all the installation work of the vibrator 1 to the numerically controlled vibrator bending device 6 has been completed, and after this,
The amount of feed of the vibrator 1 by the feed means 9, the amount of rotation of the bend die 11, the amount of expansion and contraction of the third hydraulic cylinder 27, etc. are numerically controlled by a control device (not shown) according to a preset program in the same way as in the past, and the amount of rotation of the vibrator 1 is controlled numerically in accordance with a preset program. 1 bending process is performed. This form of numerical control is conventionally well known, so a detailed explanation will be omitted. (movement of the clamp die 13 to the clamp release position), 2. Feed movement of the vibrator 1 by a predetermined amount by the feeding means 9, 3. extension of the third hydraulic cylinder 27 by a predetermined amount (movement of the clamp die 13 to the clamp position), 4
Positive rotation of the bend die 11 at a predetermined angle and synchronized with this,
5. Retraction of the vibrator 1 by a predetermined amount by the feeding means 9; 5. Contraction of the third hydraulic cylinder 27 by a predetermined amount (movement of the clamp die 13 to the clamp release position); 6. Reverse rotation of the bend die 11 by a predetermined angle; 7. The vibration by the feeding means 9. Various operations such as feeding movement by a predetermined amount in step 1 are automatically performed sequentially based on a preset program. In addition, when the bending die 11 and the feeding means 9 are driven by, for example, a pulse motor, numerical values pre-programmed in a control device (not shown) are applied to the die 1.
1 to the set rotation angle and the set feed amount of the feed means 9. Each is converted into a corresponding pulse signal.

Further, when driving the hydraulic cylinder 27, the numerical values pre-programmed in the control device are applied to the hydraulic cylinder 27.
converts it into an operation command signal for the control valve that controls the supply of hydraulic oil to the In the bending process of the vibrator 1, since the pedestal 32 is moved to the retracted position, it does not become an obstacle to the forward movement, that is, the feeding movement of the vibrator 1.

As for the positioning member, it is sufficient that its locking end has a shape that allows it to fit with the processed end of the vibrator 1 in a relatively non-rotatable manner, for example, as shown in FIG. If it is a so-called offset stamp-shaped male part 1b,
As shown in FIGS. 7 and 7A, the positioning member 3 includes a narrow female portion 38a into which the processed end of the vibrator 1 can be inserted.
8 is used.

Further, as shown in FIG. 8, when the processed end of the vibrator 1 is a so-called center stamp-shaped male part 1c, as shown in FIGS. Positioning member 39 with female part 39a in the center
is used. Furthermore, as shown in FIG.
If the processed end is a so-called sloped stamp-shaped male part 1d,
For example, as shown in FIGS. 9 and 9A, a positioning member 40 is used that includes an inclined female portion 40a into which the processed end can be inserted. Each of the above positioning members 37 to 40 is a cradle 3.
2 may be prepared in advance, or may be attached to the pedestal 32 in a replaceable manner.

Although the support stand 31 is provided on the bend arm 12 in the above-mentioned embodiment, it may be provided integrally with the bend die 11. In other words, the support stand 31 is provided on the lower side of the clamp position 30 along the bending rotation direction 29 of the bend die 11. It is only necessary that the cradle 32 is movable between the positioning position and the retracted position.

As described above, according to the present invention, the end portion is pre-drilled,
A feeding means 9 that holds the vibrator 1 and sends it in the axial direction by applying processing such as crushing and making the end part a processed end consisting of the female part 1a or the male parts 1b to 1d; around an axis perpendicular to the axial direction; a bend die 11 that rotates to rotate and has a bending surface of the vibrator 1 on its outer periphery; a clamp die 13 that clamps a portion of the vibrator 1 in front of the portion to be bent to the bend die 11; a straight pipe of the vibrator 1; a pressure die 14 that supports and guides the part; a positioning device 5 that restricts the feeding movement of the vibrator 1 by the feeding means 9 and determines the initial position of the vibrator 1 before bending;
The positioning device 5 includes the clamp tie 1.
3, the bending rotation direction 29 of the bending die 11
A pedestal 32 supported by the bend die 11 on the lower side, and a pedestal 32 supported by the female part 1 of the vibrator 1.
a, or a drive mechanism 50 that reciprocates between a positioning position facing the processing end consisting of the male parts 1b to 1d and a retracted position that allows the feed movement of the vibrator 1,
The pedestal 32 has a male part 37a or a female part 3 which can be fitted in a relatively non-rotatable manner with the female part 1a or the processed end of the male parts 1b to 1d of the vibrator 1 at the positioning position.
Since it is provided with a locking end consisting of 8a to 40a, positioning operation with respect to the vibrator 1 before bending is extremely easy,
It is no longer necessary to provide a positioning recess in the vibrator as in the prior art, which shortens the processing process, and also eliminates the need to provide a seam detection means.

Moreover, the locking ends made of the male parts 37a or the female parts 38a to 40a of the positioning members 37 to 40 are shaped to fit with the processed ends of the vibrator 1, made of the female part 1a or the male parts 1b to 1d, so that they cannot rotate relative to each other. Therefore, the vibrator 1 is reliably positioned both in the axial direction and the rotational direction by fitting the locking end and the processed end, and therefore the vibrator 1 as a whole is
Improves positioning accuracy. Moreover, vibe 1
Since the ends of the vibrator are processed in advance in a straight pipe state, handling of the vibrator during such processing becomes extremely easy.
Furthermore, a pedestal 32 that supports the positioning members 37 to 40
can be moved to the retracted position that allows the feed movement of the vibrator, and therefore, in the retracted position, the positioning members 37 to 40 do not obstruct the feed movement of the vibrator 1, and therefore the bending process of the vibrator 1 is hindered. It is done without.

[Brief explanation of the drawing]

Fig. 1 is a sectional view for explaining the prior art, Figs. 2 to 9A show an embodiment of the present invention, Fig. 2 is a plan view of the main part, and Fig. 3 is a plan view of the positioning mechanism. Figure 4 is the third
Figure 5 is the front view of Figure 4, left side view of Figure 4, Figures 6 to 9 are
The figure is a sectional view showing various positioning members fitted to the end of the vibrator, and a front view of each positioning member shown in FIGS. 6A to 9A. 1... Vibrator, 1a... Female part, 1b,
1c, 1d...Male part, 5...Positioning device, 6...Numerically controlled vibe bending device,
7...Rule, 8...Basic, 9...
Feeding means, 10...Header, 11...Bend die, 12...Bend arm, 13...Clamp die, 14...Pressure die, 29...
・Bending forming rotation direction, 30...clamp position,
37, 38, 39, 40...positioning member, 37
a... Male part, 38a, 39a, 40a... Female part, 50... Drive mechanism.

Claims (1)

[Claims] 1. A feeding means 9 which holds and feeds the pipe 1 in the axial direction by subjecting the end thereof to processing such as drilling or crushing in advance so that the end is a processed end consisting of the female part 1a or the male parts 1b to 1d. ;
a bend die 11 that rotates around an axis perpendicular to the axial direction and has a bending surface for the pipe 1 on its outer periphery; a clamp die 13 that clamps a portion of the pipe 1 forward of the portion to be bent to the bend die 11; and; a pressure die 1 that supports and guides the straight pipe portion of the pipe 1;
4; and a positioning device 5 for regulating the feeding movement of the pipe 1 by the feeding means 9 and determining the initial position of the pipe 1 before bending. 13 from the clamping position 30 of the pipe 1 to the bend die 11.
A pedestal 32 supported by the bending die 11 on the downstream side of the bending rotation axis direction 29 of the pipe 1, and this pedestal 32 facing the processed end of the female part 1a or male parts 1b to 1d of the pipe 1. Positioning position and the pipe 1
and a drive mechanism 50 that reciprocates between a retracted position and a retracted position that allows the feed movement of the pipe 1, and the cradle 32 is configured to move the female part 1a or the male parts 1b to 1d of the pipe 1 at the positioning position. A numerically controlled pipe bending device characterized by having a locking end consisting of a male portion 37a or female portions 38a to 40a that can be fitted to the end in a manner that prevents relative rotation.