JPH045247Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a super-finishing machine that presses a grindstone against a rotationally driven workpiece to super-finish the surface of the workpiece. The present invention relates to a support device for a workpiece.

(Prior art) A grindstone is pressed against the machined surface of a workpiece that is rotationally driven by a rotating main shaft while vibrating in a plane that includes the rotational axis of the workpiece and along the machined surface. A super-finishing machine for super-finishing the machined surface of a workpiece has been known for a long time. The grindstone is configured to vibrate by attaching a grindstone support device such as that disclosed in .

By the way, in this type of super-finishing machine, a pressing cylinder equipped with a piston rod projecting downward is fixed to the vibrating body via a support member, and a super-finishing grindstone is rigidly attached to the lower end of the piston rod. There is. Therefore, if center runout occurs as the workpiece rotates at a speed of approximately 400 rpm, such as when the chuck posture relative to the main axis of the workpiece is poor, the grinding wheel will not be able to follow the runout of the machined surface. However, there was a problem in that uncut parts were left on the machined surface.

(Purpose of the invention) In view of the above-mentioned circumstances, an object of the present invention is to provide a workpiece support device for a super-finishing machine that can support the workpiece so that center runout does not occur.

(Structure of the invention) The workpiece support device according to the invention includes a spindle chuck that rotates and drives the workpiece while floating the workpiece, and a spindle chuck that is disposed on the opposite side of the superfinishing grindstone with respect to the axis of the rotating spindle, and The present invention is characterized by comprising a support grindstone that operates to constantly press objects against the superfinishing grindstone.

(Effects of the invention) According to the invention, since the center run-out of the workpiece is regulated, super-finishing machining without leaving any uncut parts on the machined surface becomes possible.

(Examples) Examples of the present invention will be described in detail below with reference to the drawings.

In Fig. 1, 1 is the rotating main shaft of the super finishing machine, 2
3 is a collector chuck coaxially attached to the tip of the rotating main shaft 1, and 3 is a collector chuck 2.
The workpiece (gear) is floatingly supported. The collector chuck 2 includes a shaft body 4 fixed to the rotating main shaft 1 and having a tapered surface 4a at its tip, and a plurality of shaft bodies each having an arcuate outer peripheral surface 5a and fitted into the tapered surface 4a of the shaft body 4. A floating collet 5, a clamp rod 6 that moves the collet 5 in the axial direction along the tapered surface 4a of the shaft body 4 to clamp and unclamp the workpiece 3, and a clamp rod 6 that supports the rear end surface of the workpiece 3. and a floating reference ring 7 for positioning the workpiece 3 at a reference position. Reference ring 7
As shown in FIG. 2, two pins 9, 9 (the pins 9, 9 have an angular spacing of 180° from each other) are attached to an intermediate ring 8 provided coaxially outside this reference ring 7. The intermediate ring 8 is rotatably supported through the intermediate ring 8, and the intermediate ring 8 is connected to a fixed ring 10 which is coaxially provided on the outside of the intermediate ring and fixed to the shaft body 4.
Book pins 11 and 11 (pins 11 and 11 are also mutually
with an angular spacing of 180°), and the axes of the pins 9, 9 and the pin 1
Due to the fact that the axes 1 and 11 are orthogonal,
The reference ring 7 is connected to the shaft body 4 via a universal joint, and with this configuration, the workpiece 3 is supported in a floating manner.

On the other hand, a superfinishing whetstone 13 supported by a whetstone holder 12 is pressed against the machining surface 3a of the workpiece 3, and a vibrating body (not shown in the figure) vibrated by an eccentric cam rotated by a motor, for example. Since the grindstone holder 12 is attached to the machine (omitted) via a pressing cylinder, the superfinishing grindstone 13 is pressed against the machined surface 3a while vibrating along the machined surface 3a in a plane including the axis L of the rotating main shaft 1. It will be done. Furthermore, a support grindstone 14 disposed on the opposite side of the superfinishing grindstone 13 with respect to the axis L is pressed against the processing surface 3a. As is clear from FIG. 3, the grindstone holder 15 of the support grindstone 14 is attached via a connecting rod 18 to the piston rod 17 of the pneumatic cylinder 16 attached to the fixed part 20. The superfinishing grindstone 13 is constantly pressed by the action of the pneumatic cylinder 16 . The connecting rod 18 is slidably supported by a ball guide 19.

The above is an example of the structure of the workpiece support device according to the present invention. In this structure, the workpiece 3 is floatingly supported by the floating chuck 2, and the workpiece 3 is placed on the supporting grindstone 14. Because it is constantly pressed against the super finishing whetstone 13,
The center run-out of the workpiece 3 is regulated, and super-finishing machining without leaving uncut parts on the machining surface 3a is possible.

[Brief explanation of drawings]

FIG. 1 is a side view of a part of the workpiece support device according to the present invention taken along the line - in FIG. 2; FIG. 2 is a sectional view taken along the line - in FIG. 1;
FIG. 3 is a partially sectional front view. 1...Rotating main shaft, 2...Collection chuck, 3
...Workpiece, 3a... Machining surface, 4... Shaft body, 5
... Collet, 6 ... Clamp rod, 7 ... Reference ring, 8 ... Intermediate ring, 10 ... Fixed ring, 13 ... Super finishing grindstone, 14 ... Support grindstone, 1
6...Pneumatic cylinder.

Claims (1)

[Scope of Claim for Utility Model Registration] A workpiece in a super-finishing machine that presses a super-finishing grindstone against the machined surface of the workpiece that is rotatably driven by a rotating spindle to perform super-finishing on the machined surface. The support device includes a spindle chuck that rotates and drives the workpiece while floatingly supporting the workpiece, and a support device that is disposed on the opposite side of the superfinishing grindstone with respect to the axis of the rotating spindle, and supports the workpiece in the superfinishing grindstone. A support device for a workpiece of a super-finishing machine, characterized by comprising a support grindstone that operates so as to constantly press against the finishing grindstone.