JPS58143930A - Refrigerating chuck method - Google Patents

Abstract

PURPOSE:To fix a work in place preventing a lift in a freezing chuck by coagulating a liquid with a directivity freezing it gradually from the side of the work. CONSTITUTION:A work 2 to be machined is housed in place in a cavity (1a) of a freezing frame 4 on the bottom of which a heat insulating material 3 is laid and the freezing frame 1 and the work 2 are cooled down below the freezing temperature of the liquid as it is. Then, a liquid is injected into the cavity (1a). And a part of the work 2 is frozen securely and then, the liquid is coagulated with a directivity in such a manner as to freeze as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a freezing chuck method for fixing a workpiece to be machined using directional solidification. Conventionally, a method of fixing a workpiece to be machined to a freezing frame or the like by freezing has already been adopted. However, when the workpiece is a small and lightweight anastomosis, with the conventional chuck method, the workpiece (+) 4° rises due to the increase in volume when the liquid solidifies, and the fixation position becomes incorrect even if the workpiece is positioned in a predetermined position. Therefore, conventionally, a load is applied to the workpiece before the liquid solidifies to prevent the workpiece from floating during solidification, but this method requires equipment to apply a load to the workpiece. Well, there are two problems that can cause major damage to the device.

This invention was made with the aim of improving this problem, and provides a freezing chuck method that allows the workpiece to be fixed in a predetermined position without floating by directional solidification of the liquid that freezes and fixes the workpiece. This enables machining of workpieces without requiring expensive equipment.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
In the figure, 1 is a freezing frame for fixing a workpiece 2 to be machined, and has a cavity 1α that is slightly larger than the workpiece 2, and a stepped portion 1h is provided at the opening of the cavity 1α. The machining reference surface 2 of the workpiece 2 is attached to this stepped portion 1b.
α(2) can be brought into close contact. The work 2 has, for example, a shape with seven lunges 2h and 2c at the upper and lower parts,
The lower surface of the upper 7 flange 2b serves as the processing reference surface 2a, and the lower 7 flange 2C is located within the cavity 1α.
A protruding portion 1c protruding from the inner surface of the cavity 1α is located close to the upper side of the cavity 1α.

When fixing the work 2 having the above configuration, a heat insulating material 3 made of rubber or plastic having a heat insulating effect is completely laid on the bottom of the cavity 1α of the freezing frame 1, and the work 2 is housed in the cavity 1α. The processing reference surface 2α of the workpiece 2 is brought into close contact with the stepped portion 16 of the freezing frame 1. In this state, the workpiece 2 together with the freezing frame 1 is put into the freezer, and the freezing frame 1 and the workpiece 2 are cooled to, for example, about -30°C.

When the photons are cooled, they are taken out and a liquid such as water that easily freezes is injected into the cavity 1α of the freezing frame 1. When the liquid in the cavity 1α is cooled by the freezing frame 1, freezing begins. At this time, the liquid near the protrusion IC that is in contact with the lower 7 langes 2c of the workpiece 2 is frozen, and the upper part of the lower 7 langes 2C is first fixed, and then the upper part of the lower 7 langes 2c is fixed. Since the liquid solidifies directionally to the upper layer, the liquid in the first layer that is frozen first acts as a holding jig to prevent the workpiece 2 from floating up, thereby keeping the machining reference surface 2α of the workpiece 2. Dan It! + It is possible to fix the work 2 at a predetermined position in the freezing frame 1 without lifting it from A. The workpiece 2 fixed to the freezing frame 1 can be machined by fixing the freezing frame 1 to a predetermined position of a machine tool or the like.

As described in detail above, this invention first fixes a part of the workpiece housed in the freezing frame using directional solidification of liquid, and then freezes and fixes the entire workpiece. Even if the work is lightweight, there is no risk that it will float up when it freezes and become misaligned, and it can also be carried out at low cost since it does not require any equipment to prevent it from floating up.

(4)

[Brief explanation of the drawing]

The drawing is a sectional view showing one embodiment of the present invention. 1 is the freezing frame, 1α is the cavity, and 2 is the workpiece. Applicant: Komatsu Ltd. Representative Patent Attorney Masahisa Yonehara Patent Attorney Tadashi Flood

Claims (1)

[Claims] The workpiece 2 to be machined is placed in the cavity 1α of the freezing frame 1, and in this state, the freezing frame 1 and the workpiece 2 are cooled to below the freezing temperature of the liquid, and then a liquid is injected into the cavity 1α. A freezing chuck method characterized in that a part of the workpiece 2 is first frozen and fixed by directional solidification of the liquid, and then the entire workpiece 2 is fixed by freezing the entire liquid.