JPH0747128Y2 - Stretcher chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a chuck for a stretcher used in a stretcher.

[Prior Art] FIG. 4 is a view showing a work 1 formed in a plate shape.
This work 1 is a so-called clad material composed of a copper plate 1a and two titanium plates 1b attached to both surfaces of the copper plate 1a.

Generally, in order to form such a plate-shaped work 1, steps such as heating and rolling of the work 1 must be performed. Due to this step, the work 1 is greatly distorted, which is inconvenient in the steps such as transportation and processing.

Therefore, conventionally, a stretcher applies a pulling force to both ends of the work 1 to remove the distortion of the work 1 to correct the shape.

FIG. 5 to FIG. 7 are views showing a conventional technique of a stretcher chuck used for such a stretcher. As shown in FIG. 5, the work 1 is distorted by heating, rolling, etc., and has a recess 1c formed on its upper surface. Stretcher chucks 2 are arranged at both ends of the work 1. This chuck 2 is a work 1
Rectangular plate-shaped two upper sandwiching plates arranged on both ends of the upper surface of the
2a and two lower holding plates 2b arranged at both ends on the lower surface side of the work 1 and formed in the same shape as the upper holding plate 2a, and a total of four holding plates.

When the chuck 2 having the above structure is attached to a stretcher, both ends of the work 1 are clamped between the upper and lower clamp plates 2a and 2b. In the stretcher, the upper and lower sandwiching plates 2a and 2b are respectively attached to the upper and lower sandwiching plates 2a and 2b in a direction approaching each other in the thickness direction of the work 1 (p and q directions in FIG. 5).
A hydraulic cylinder or the like (not shown) that is capable of applying a pulling force to the work 1 in the pulling direction (r and s directions in FIG. 5) while being pressed is attached.

In the stretcher using the conventional chuck having the above structure, first, as shown in FIG. 5, the work 1 having a strain is inserted between the upper and lower holding plates 2a and 2b, and then,
The upper and lower clamping plates 2a and 2b are pressed by the air cylinders in the p and q directions in FIG. 5 to clamp both ends of the work 1 while pulling the chuck 2 in the r and s directions in FIG. Apply tensile force to the work 1. In this way, the distortion of the work 1 can be removed (6th
Figure).

[Problems to be Solved by the Invention] However, in the above-described conventional chuck 2, the ridge line that abuts against the work 1 on the side faces of the upper and lower holding plates 2a and 2b that face each other in the direction along the surface of the work 1. 2c
As shown by an arrow B in FIG. 6, the work 1 may be cracked at a contact portion between any of the above and the surface of the work 1, and the work 1 is broken when a tensile force is further applied. was there. Therefore, the yield rate of the work 1 after processing is deteriorated. This cause is considered to be due to the following circumstances. That is, when the upper and lower sandwiching plates 2a and 2b are attached to the stretcher main body, due to an attachment error, they may be attached not in parallel with the work 1 but with a certain inclination. For example, when the upper and lower holding plates 2a and 2b are attached in a state in which they are tilted at a certain angle around an axis perpendicular to the paper surface in FIG. A shear stress is applied to the portion indicated by the arrow B by any of the ridge lines 2c of the upper and lower holding plates 2a and 2b, and the work 1 is cracked. It is considered that if a tensile force is further applied to the work 1 in this state, a concentrated stress acts on the crack and the work 1 breaks from the crack portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stretcher chuck capable of preventing breakage of a work.

[Means for Solving the Problem] Therefore, the present invention proposes a non-linear ridge line of four sandwiching plates used for a stretcher chuck, which are on the side surfaces facing each other in the direction along the surface of the work and are in contact with the work. To be formed into a shape.

[Operation] According to the present invention, in the state where the sandwiching plate is installed while being inclined,
Even if a tensile force is applied to the work, shear stress is applied to the work along the ridge line of the non-linear sandwiching plate. At this time, the length of contact between the ridgeline of the sandwiching plate and the work is longer than that in the case where the ridgeline is formed in a straight line because the ridgeline is made non-linear. Therefore, the shear stress applied to the work can be made smaller than in the case where the sandwiching plate is formed in a normal rectangular plate shape. Therefore, it is possible to prevent the work from cracking and breaking.

[Embodiment] FIGS. 1 to 3 are views showing a holding plate 21 used in an embodiment of the chuck for stretcher of the present invention.

In the description of the present embodiment, the description of the configuration common to the above-described conventional stretcher chuck is omitted,
Only different configurations will be described.

The sandwiching plate 21 of the present embodiment is provided with a notch 23a on the surface 23 that comes into contact with the workpiece 1 when the workpiece 1 is sandwiched. The notch 23a is a holding plate when the four holding plates 21 are arranged on both end sides of the work 1, respectively.
The side walls 22 are opposed to each other in the direction along the surface of the work 1 and are open on the side surface 22 side. As a result, the notch 23a and the surface 2 that contacts the work 1
As shown in FIG. 1, the ridge line 23b with the three arcs 23
It has a non-linear shape formed from c. That is, the ridge line 23b of the holding plate 21, which is on the side surface 22 side facing in the direction along the surface of the work 1 and is in contact with the work 1.
Has a non-linear shape.

Further, on the surface 23 of the holding plate 21 that abuts the work 1,
An anti-slip 23d composed of a large number of irregularities is formed.

According to the chuck using the sandwiching plate 21 of the present embodiment configured as described above, even if a tensile force is applied to the work 1 in the state where the sandwiching plate 21 is attached to the stretcher while being inclined, the chuck 1 is made non-linear. Shear stress is applied to the work 1 along the ridgeline 23b of the holding plate 21. At this time, the length of contact between the ridgeline 23b of the sandwiching plate 21 and the work 1 is longer than that in the case where the ridgeline 23b is formed in a straight line because the ridgeline 23b is made non-linear. Therefore, the shear stress applied to the work 1 can be made smaller than in the case where the sandwiching plate 21 is formed in a normal rectangular plate shape. For this reason, it is possible to prevent the work 1 from cracking and breaking, and it is possible to improve the yield rate of products.

Although the ridge line 23b of the notch 23a is formed by the three arc portions 23c in the above-described embodiment, the present invention is not limited to this, and may be a sawtooth shape. Further, in the above embodiment, the ridge line 23b is formed in a non-linear shape by providing the notch 23a in the surface 23 of the holding plate 21 that faces the workpiece, but the present invention is not limited to this, and for example, the holding plate 21. Side 22 of
The ridge line 23b contacting the work 1 may be formed in a non-linear shape by bulging in the direction along the surface of the work 1. In short, the above-mentioned advantages can be obtained if the ridge line 23b that abuts on the work 1 is non-linear.

[Advantages of the Invention] In the present invention, the ridge lines of the four sandwiching plates, which are on the side surfaces facing each other in the direction along the surface of the work and are in contact with the work, are formed non-linearly. This has the effect of reducing breakage and improving the yield rate of products.

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention.
1 is a plan view of the holding plate, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III in FIG.
4 to 7 are views showing a conventional technique, FIG. 4 is an enlarged sectional view of a work, FIG. 5 is a side view showing a state where a work is clamped by a clamping plate, and FIG. FIG. 7 is a side view showing a state in which a tensile force is applied to the work, and FIG. 7 is a plan view of FIG. 1 …… Workpiece, 2 …… Stretcher chuck, 21 ……
Clamping plate, 22 ... Side faces of the clamping plate that face each other in the direction along the surface of the work, 23b ... Ridge line of the clamping plate that abuts the work.

Claims (1)

[Scope of utility model registration request] 1. A plate-shaped workpiece is provided with four sandwiching plates arranged on both end sides and both sides of the workpiece, respectively.
A chuck for a stretcher for sandwiching both ends of a work by these four sandwiching plates, wherein the ridgelines of the four sandwiching plates that are in contact with the work on the side surfaces facing each other in the direction along the surface of the work are Stretcher chuck characterized by being formed in a straight line.