JPH0751232Y2 - Spindle positioning device for precision dial type base machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for precisely positioning a spindle and a collet of a precision dial type base machine.

(Prior art) When cutting with the work piece and spindle completely positioned like the spindle used in machine tools, the surroundings of the tool are open, so it is easy to remove chips generated during cutting. Met. However, when a workpiece used for a machining machine such as a base machine is fixed by a collet to perform cutting and a high centering accuracy is to be obtained, a high positioning accuracy of the spindle and the collet is inevitably required.

Conventionally, positioning was performed by increasing the indexing accuracy itself of a dedicated machine or by forming a tapered surface on the abutting surfaces of the spindle and collet.

(Problems to be solved by the invention) By the way, in the above-mentioned conventional technology, there is a limit to the machining accuracy and assembly accuracy of the device itself in order to improve the indexing accuracy of the dedicated machine. ㆝ There was a similar problem because it was determined by the indexing accuracy.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and positions a spindle that moves up and down in a cylinder so as to match the center of a collet and cut a workpiece mounted on the collet. In the precision dial type base machine described above, the collet is floated in the radial direction with respect to the collet holder, and the tapered surface is formed so as to match the inner circumference of the lower end opening of the cylinder and the outer circumference of the upper end of the collet. And

(Embodiment) Next, a detailed description will be given based on an embodiment of the present invention shown in the drawings. A is a spindle part and B is a collet part. The spindle portion A is composed of a spindle 2 vertically moved by an upper motor (not shown) in the center of the cylinder 1 and an oil chamber 3. 4 is an oil seal above the oil chamber 3,
Reference numeral 5 is an oil inlet to the oil chamber 3, 6 is a taper surface on the outer periphery of the opening 7 at the front end of the cylinder 1, and 8 is an air escape hole.

In the collet portion B, the collet 10 is arranged in the collet holder 11, and annular gaps 12 and 13 are formed between the inner surface of the collet holder 11 and the outer surface of the collet 10, so that the collet 10 can freely move in a direction perpendicular to the axial direction by a certain amount. It can be translated. A taper surface 14 that coincides with the taper surface 6 is formed on the outer periphery of the upper end of the collet 10.

Next, the operation will be described. As shown in FIG. 1, the work W is attached to the collet 10. Next, when a force for pushing the spindle 2 downward is applied, the cylinder 1 first descends, and the tapered surface 6 of the spindle portion A contacts the tapered surface 14 of the collet 10 as shown in FIG. Collet 10 has tapered surface 6 and tapered surface 14
Is pushed, and the center of the spindle 2 and the center of the collet 10 are aligned so as to move in parallel in the annular gaps 12 and 13 in the radial direction, and the centers are completely aligned and fixed.

Next, as shown in FIG. 3, the spindle 2 is lowered and the work W is cut. At this time, the oil is filled in the oil chamber 3, and the cutting chips are also accumulated therein. When the cutting process is completed, the housing 1 and the spindle 2 return to their original positions shown in FIG.
At this time, the backflow of oil is prevented by the air holes 8.

(Effect) According to the present invention, the collet holder is used in the precision dial type base machine in which the spindle that moves up and down in the cylinder is aligned with the center of the collet and positioned to cut the workpiece mounted on the collet. It is arranged to float in the radial direction, and a tapered surface is formed that matches the inner circumference of the lower end opening of the cylinder and the outer circumference of the upper end of the collet, so that the center of the spindle and collet can be completely removed without increasing the indexing accuracy. Can be matched.

[Brief description of drawings]

1 is a front sectional view before the operation of one embodiment of the present invention, FIG. 2 is a front sectional view at the time of centering, and FIG. 3 is a front sectional view at the time of processing. A ... Spindle part B ... Collet part 1 ... Cylinder 2 ... Spindle 6 ... Tapered surface 7 ... Opening part 10 ... Collet 11 ... Collet holder 12, 13 ... Annular void 14 ... Tapered surface

Claims (1)

[Scope of utility model registration request] 1. A precision dial type base machine in which a spindle moving up and down in a cylinder is positioned so as to match the center of a collet to cut a work mounted on the collet, and the collet is held against a collet holder. A spindle positioning device for a precision dial type base machine which is arranged in a radial direction and has a tapered surface that matches the inner circumference of the lower end opening of the cylinder and the outer circumference of the upper end of the collet.