JPS6122721Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a chuck device mainly for stretch wrap formers used for bending longitudinal materials, and particularly to a chuck device for longitudinal workpieces having a grooved cross section.

When bending the R portion of a longitudinal material such as an angle material, when processing a longitudinal material that does not have a groove in its cross-section, such as an L-shaped material or a Z-shaped material, there are less problems in terms of chucking and cross-sectional deformation. There is no
It can be easily processed using a stretch wrap former, and the finished shape is also good, but when working with a grooved cross-section like a U-shaped material, there are problems with chucking and cross-sectional deformation. Conventionally, only the R portion was press-formed, and then joined to the direct material by welding.This joining method not only required a large number of man-hours, but also caused variations in the finished shape. For example, if the finished material is used for the side pillars of a car body,
When assembling the vehicle body, it is troublesome to have to make adjustments while assembling the vehicle body.

However, when a workpiece with a grooved cross section is bent using a stretch wrap former, the presence of the groove makes it difficult to apply a strong chuck to the workpiece. It is difficult to obtain tensile force, and as a result, the finished shape may collapse, resulting in a significant decrease in the commercial value of the processed material.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and the purpose of the present invention is to provide a chuck device mainly for a stretch wrap former that can firmly hold this type of workpiece. be.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

As shown in Fig. 1, the stretch wrap former consists of a wrap cylinder 2 mounted symmetrically on the left and right sides of a mold 1, and a revolving frame pivotally attached to the tip of an operating rod 3 of the cylinder 2. It consists of a tension cylinder 4 and a chuck device 6 attached to the tip of the operating rod 5 of the cylinder 4. Between the left and right chuck devices 6, a U-shaped angle material is used as a workpiece 7. As shown in FIG. 2, a core metal 8 is loaded into the groove 7a of the bent portion of the workpiece 7.

When this former is activated, each cylinder 2, 4
Pressure oil is supplied to each of the tension cylinders 4 and 4.
The workpiece 7 is tensioned with an appropriate tensile force by the contraction action of the wrap cylinder 2, and the workpiece 7 is rolled up onto the mold 1 by the contraction action of the wrap cylinder 2. As a result, an R portion is formed in the middle part of the workpiece 7, as shown in Figure b. is formed.

Next, the formation mode of the chuck device 6 of the embodiment will be specifically explained with reference to FIGS. 3 to 6.

A swivel ring seat 11 is fastened with a bolt 12 to the back surface of the tail stock 10, which is a square block with a U-shaped cross section, that is, the opposite surface of the cut surface. Therefore, the stock 10 is freely rotatable with respect to the operating rod 5, and when the workpiece 7 is held, the side surface of the stock 10 is inclined at about 45 degrees.

At the upper and lower edges of the U-shaped notch of the stock 10, a pair of base plates 13 and 14, each having a wedge-shaped cross section and a symmetrical inclined surface with opposing surfaces widening inward, are attached to the bar 17. The inner and outer guide grooves 13a are fixedly fixed to prevent them from coming off and are formed on the opposing wall surfaces of the base plates 13 and 14.
Sliding plates 15, 16 are held in 14a, and these sliding plates 15, 16 are connected to the base plates 13, 14.
Both sliding plates 1
Expand/shrink the contact distance between 5 and 16.

Furthermore, grooves 15a and 16a are provided in the inner ends of the upper and lower sliding plates 15 and 16 in parallel with each other in the lateral direction. , the lower edges are loosely fitted, so that the sliding plates 15, 16 slide inwardly and outwardly together with the actuating plate 18.

A piston body 18a is fixedly installed in the center of the back surface of the actuating plate 18, and the piston body 18a is moved by hydraulic pressure from an oil hole 19a at the back of an oil chamber 19 formed at the axis of the stock 10. Extruded.

Next, on the opposing surfaces of the sliding plates 15 and 16, liners 20 and 21 are spread and prevented from coming off, and between the liners 20 and 21 there is a pair of anvil-shaped halves. Shape-shaped jaws 22 and 23 are clamped.

Therefore, on the opposing surfaces of each of the jaws 22 and 23, there are two orthogonal surfaces 22 that are inclined at approximately 45 degrees with respect to the opposing direction.
a, 23a are formed, and the core 2 is placed in the groove 7a.
The end of the workpiece 7 to which 4 is attached is attached to these 4 surfaces 2
2a and 23a and are pressed.

Note that both sides of the core 24 are finished with rough surfaces 24a to prevent slipping, and as shown in FIG. 7, a cylindrical magnet 26 is fastened to the bottom with bolts 25. .

Since the core 24 is fitted into the groove 7a of the workpiece 7 in this way, when the workpiece 7 is put in and taken out of the stock 10, the core 24 does not move due to magnetic attraction and friction. It never falls off.

The chuck device 6 of the embodiment is formed as described above, and in order to chuck the workpiece 7, first,
The hydraulic pressure in the oil chamber 19 is removed, the actuating plate 18 is retracted to open the space between the jaws 22 and 23, and the end of the workpiece 7 with the core 24 attached is moved between the jaws 2 and 23.
2 and 23, and then insert the oil hole 1 in the oil chamber 19.
Hydraulic pressure is applied from 9a to advance the actuating plate 18, thereby closing the space between the jaws 22 and 23 and opening the four faces 22.
a, 23a press the workpiece 7 diagonally,
is attached to the tail stock 10 and held.

At this time, the pressing force of the jaws 22 and 23 becomes strong due to the boosting effect of the wedge of the sliding plates 15 and 16, and furthermore, the pressing force is distributed evenly over the four surrounding surfaces of the workpiece 7. Therefore, its holding power is extremely strong.

Therefore, even if the tension cylinder 4 outputs a sufficiently strong tensile force, the workpiece 7 may wobble or
There is no chance of the tool coming off, and as a result, the finished shape of the R portion of the workpiece 7 can be accurately and uniformly formed.

As described above, according to the chuck device of the present invention, the core is fitted into the groove of the chucked portion of the workpiece having a grooved cross-section to form a square cross-section, and the core is clamped within the tail stock 10. A substantially V-shaped groove with a right triangular cross section formed by two orthogonal surfaces inclined at approximately 45 degrees with respect to the opposing surfaces of the pair of half-split jaws 22 and 23 is formed. Since the diagonal corners of the workpiece are positioned within the corners of the V-shaped groove and pressed and clamped, the four surfaces of the outer periphery of the workpiece having a groove-shaped cross section are sandwiched between the diagonals,
The four opposing faces of the pair of V-shaped grooves can be placed in opposition to each other and clamped in the opposite direction substantially perpendicular to the diagonal line, and the corners of the workpiece will not be deformed due to chuck. The four circumferential surfaces can be pressed and clamped evenly.

This enhanced holding force has the effect of improving the bending workability of long materials and the usability of the stretch wrap former, such as making it possible to bend long materials with a grooved cross-section using the stretch wrap former. There is.

Furthermore, the pair of half-split jaws 22 and 23 that hold the workpiece are connected to the pair of fixed inclined guide grooves 1 facing each other.
A pair of sliding plates 1 that move forward and backward along 3a and 14a
The sliding plates 15 and 16 move forward and backward to expand and contract together with the sliding plates 15 and 16, and the substantially center portions of the rear ends of the sliding plates 15 and 16 are pulled by the piston body 18a of the fluid piston device provided in the substantially center portion of the rear surface of the tail stock 10. Since the expansion/contraction operation is tilted and operated, the expansion/contraction operation is smooth and has the advantage of being simple in construction.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view of a stretch wrap former equipped with a chuck device according to an embodiment of the present invention, in which Fig. a shows the state before processing, Fig. b shows the state after processing, and Fig. 2 shows the state after processing. , a partial perspective view of FIG. 1, and FIG.
FIG. 4 is an enlarged view of the part shown in FIG. 1, FIG. 4 is a sectional view taken along the arrow in FIG.
6 is an enlarged view of the portion shown in FIG. 4, and FIG. 7 is a cross-sectional view along the line shown in FIG.
FIG. 4... Tension cylinder, 5... Operating rod, 6
...chuck device, 7 ... processed material, 10 ... tail stock, 11 ... swivel ring seat, 13, 14
... Base plate, 13a, 14a ... Guide groove, 15, 1
6...Sliding plate, 22, 23...1 pair of jiyos, 2
4...Middle child.

Claims (1)

[Claims for Utility Model Registration] Base plates 13 and 14 provided on the opposing inner surfaces of the U-shaped notch on the front surface of the tail stock 10 whose side surfaces are approximately U-shaped blocks, and opposing wall surfaces of the base plates 13 and 14. guide grooves 13a, 14b formed in the front-rear direction and inclined in a symmetrical front-rear direction in a rearwardly expanding manner; sliding plates 15, 16 slidably mounted in the guide grooves 13a, 14b; and the tail stock 10. A piston body 18 that is mounted approximately in the center of the back surface and is moved in the front-rear direction.
a fluid piston device in which opposing ends of an actuating plate 18 fixed at the tip of the slide plate 18 are loosely engaged in grooves 15a and 16a provided in opposing surfaces of the rear ends of each of the sliding plates 15 and 16; A pair of half-split jaws 22, 23 provided on opposing surfaces of each of the sliding plates 15, 16; a rectangular block-shaped core 24, and the opposing surface of the pair of jaws 22, 23 has a right-angled triangular cross section formed by two orthogonal surfaces inclined at about 45 degrees with respect to the surface. Grooves 22a and 23a are formed facing each other in the inner and outer directions, and the corner portions on the diagonal lines of the chucked portion of the workpiece 7 whose cross section is formed into a rectangular shape by the inner fitting of the core 24 are formed in the inner and outer directions, respectively. A chuck device for a longitudinal workpiece having a grooved cross section, characterized in that it is configured to be clamped and pressed into the corners of a pair of grooves 22a, 23a.