JPS6254667A - Grindstone headstock of grinding machine - Google Patents

Abstract

PURPOSE:To prevent a grindstone from displacement and moreover from oscillation resulting from adjustment of inclination of the grindstone side surfaces by inserting spherical pedestals,having common central point near the axial direction of the grindstone center, in front and back portions of supporting body of the grindstone axis. CONSTITUTION:On a principal axis 4, a quill 9 is fixed through bearings 6, 7, 8, and moreover, front and back receiving stands 12, 13 are fixed, and a cylindrical case 14 sandwiched between the flanges of the receiving stands 12, 13 is fixed, thus a supporting body 5 is formed. And at the peripheries of the flange 15 of back end of the case 14 and the flange of a front receiving stand 12, each of the washers 17, 19 is fixed to the head stock body 3 with each of the nuts 16, 18 by being pushed against spherical pedestals 16a, 17a, 18a, 19a. Two of the spherical pedestals form parts of single spherical surface which have common central point at axially intermediate portion C of a grindstone 21. By unfastening one of the inclination adjusting screws in the radial direction of a nut 16 and fastening the opposite side screw, the sliding support body 5 supported among the spherical pedestals 16a, 17a, 18a, 19a, makes slant motion centering at the central point C, thus inclination of the side faces of the grindstone is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] "Industrial Application Field" The present invention relates to a grinding wheel headstock suitable for a two-axis grinding wheel stand for a grinding machine, particularly for a double-headed surface grinder.

``Prior Art'' Conventionally, for example, a device for tilting and adjusting a grindstone main shaft of a double-head surface grinder has been provided in order to achieve parallelism between opposing planes of the grindstone.

A conventional example of a double-headed surface grinder equipped with a mechanism for adjusting the inclination of the grinding wheel spindle is
There is an invention disclosed in Publication No. 77.

The present invention provides a support body that supports the grindstone spindle so that it can tilt and move back and forth in the cutting direction, and a spherical seat is provided between the support body and the grindstone head main body at a rear position of the grindstone spindle, and the front part is attached to the grindstone spindle main body in a spherical shape. A sleeve having a spherical outer circumferential sliding surface provided at the front of the support body is engaged with the receiver having an inner circumferential sliding surface.

By tilting the support body about the center of the spherical seat, the grindstone main shaft is tilted.

"Problems to be Solved by the Invention" In the conventional example, the center of the spherical seat provided between the support of the grinding wheel spindle and the grinding wheel headstock body at the rear position of the grinding wheel spindle lies at the lower flange and the receiver position. .

This lower flange and receiver are located at the front of the whetstone main shaft, but are quite far away from the whetstone. Therefore, there is a drawback that when the grindstone main shaft is tilted, the center position of the grindstone also changes greatly, and therefore, further adjustment may be necessary to bring the centers of both grindstones into alignment. Furthermore, the lower flange and the receiver engage on a spherical surface, but this spherical surface is located in a small range on both sides of a plane perpendicular to the main axis of the grinding wheel, and there is little clearance, making it difficult to manufacture and it is not possible to tighten rigidly at this part. This portion is not substantially restrained in the axial direction, and the grindstone vibrates simply due to the support of this portion, which adversely affects the workpiece.

This invention solves the above problems with a double-head surface grinder I equipped with a tilting device for the grinding wheel main shaft, and maintains a strong E-grinding wheel main shaft without the need to correct the alignment of the grinding wheel even when the grinding wheel main shaft is tilted. The purpose of this invention is to provide a double-headed grinding machine that can perform the following tasks.

[Structure of the invention]

``Means for Solving the Problems'' This invention provides a support body that accommodates a bearing that supports the grindstone spindle and is attached to the grindstone spindle body, and a grindstone spindle body in which the support body is loosely inserted between the front and back of the grindstone spindle. At the position, a spherical seat is provided in the axial vicinity of the center of the grinding wheel and has a common center point, and the support body can be tilted, and the support body is fixed to the grindstone headstock by pressing each of the spherical seats. This is a grinding wheel headstock of a grinding machine equipped with means.

"Function" When the support is tilted, the main axis of the grindstone is tilted in the axial vicinity of the center of the grindstone, and the inclination of the grinding end face of the grindstone is adjusted. At this time, the center position of the grindstone does not move or hardly moves at all. The common center point of each spherical seat is near the center of the grinding wheel, and the widthwise middle of each spherical seat is on a cone with the center point as the apex, so both in the axial direction and in the radial direction. The grinding wheel is also rigidly fixed by the pressing force, and there is no fear that the grinding wheel will vibrate.

"Example" Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view. The grinding wheel headstock is fixed on top of the machine. A grindstone headstock main body 3 is fixed on the machine base, and a support body, generally indicated by the symbol j for the grindstone spindle, is fixed to the grindstone headstock main body 3 so as to be adjustable in tilt. The support body 5 has front bearings 6 and 7 that rotatably support the grindstone main 411II so as not to move in the axial direction, a filter that accommodates the rear bearing j, and a bushing into which the front part of the filter is fitted so as to be able to move in the axial direction. A front holder 12 shaped like a brim envelope and a rear holder 13 shaped like a brim envelope into which the rear part of the quill 9 is fitted so as to be movable in the axial direction.
and front and rear cradle/2. /3 is inserted and fixed, and the headstock main body 3
It consists of a cylindrical case that is loosely inserted. In addition, the radial detent 1 that fits into the front pedestal/2
0 is fitted with a long groove 5'aJ cut in the axial direction on the outer periphery of the filter. The support j is a tsuba provided at the rear end of the case /4'! The nut screwed into the male thread provided on the front side of the /
6 presses the washer 77 that is fitted into the rear end of the headstock main body 3 so as to be movable in the axial direction, and the nut /K screwed into the external thread on the outer periphery of the collar of the front cradle l allows the headstock main body 3 to be pressed. Washer l fixed on the front end? by suppressing the headstock body 3.
is fixed.

Nut/A and washer/7 suppression surface and nut/g and washer/
? Each of the pressing surfaces of is configured with a spherical seat, and the spherical seat is a washer 17 with the center point C at the axial middle part of the disc-shaped grinding wheel j/ having a center hole fixed to the front end of the grinding wheel main shaft. spherical protrusion/? L is formed, and the spherical protrusion/? is formed on the nut/6.
A rear spherical seat with a spherical concave seat /Aa in close contact with a and a spherical concave seat /'l on the washer 19 with the axial intermediate part of the grinding wheel I as the center point C, that is, concentric with the rear spherical seat. It is made up of a front spherical seat in which the nut/l is provided with a spherical protrusion /geL that is in close contact with the spherical concave seat /9a. Two inclination adjustment screws arranged at four equal intervals in the radial direction of the nut/6 are screwed into the headstock main body 3, and are operated so that they can be rotated at the external part to move forward and backward. The rear washer 77g is pressed by a disc spring group J that fits into an axial circular hole provided in the grindstone headstock main body J with the circumference equally distributed on the end face of the washer 7g. This pressing force is several strong forces.

As a result, the washer 17 applies a reaction force to the nut /A, and the nut 16 is urged rearward, so that the nut 1g is urged backward through the case III and presses the washer /9. However, at/g is closed, and the washer 77 is seated on the grindstone headstock main body 3 with no gap between the front and rear spherical seats.

A male thread is cut on the outer periphery of the central part of the quilde, and a worm wheel =3 with a female thread cut on the inner periphery of the bore is screwed. Worm foil 2 is the front cradle/λ and the rear cradle/3
The thrust bearings 2'l and cogs installed in each of the wheels prevent them from moving in the axial direction, and the worm core, which is connected to the rotary drive roller ζ fixed to the grinding wheel headstock main body 31, is engaged. .

Bracket fixed to rear pedestal/3 = Pulley 3 is attached to 9.
The shaft joint 33 to which the shaft is fixed is rotatably supported by the shelf support 3/ so as not to move in the axial direction.
It fits perfectly. Pulley 3.2 and grinding wheel headstock body J
A pulley 3 is fixed to the shaft end of an electric motor 35 fixed to
A belt J is wrapped around 6.

The through hole of the grinding wheel main shaft is connected to the cutting fluid supply pipe 3g at the rear end.

When the electric motor 3S is energized, the pulley 36 rotates and the pulley 3- is moved to the bearing 31 on the bracket iron via the belt 3.
The main shaft of the grinding wheel is rotated in the filter through the shaft coupling 33 and the sliding key 3II while being supported by the front bearings 6, 7 and the rear bearing t, and the grinding wheel is rotated. The workpiece is ground by rotating /.

Adjustment of the cutting direction of the grinding wheel 1 is carried out by rotating the worm wheel by the rotary driving device roller, and the worm wheel 2j is supported by the thrust bearing and rotor, rotates, and sends the quill 9 connected by a threaded pair in the axial direction. I, the whetstone-/
To correct the inclination of the grinding surface, loosen the radially arranged inclination adjustment screws here, and screw in the inclination adjustment screws located opposite the grinding wheel main shaft. , spherical protruding seat/711L and spherical concave seat/? a
, the spherical protrusion /la, and the support j tilts about the center point C.

In the embodiment, the center point C is the center of the grindstone 21 in the axial direction, but it is located at a sufficiently close distance from the grinding surface of the grindstone, that is, within the vicinity of the grindstone si within a range in which the center of the grindstone 1 cannot be displaced due to rotation. Bye.

By doing this, the surface connecting the center point C and the middle of the front spherical seat in the width direction of the seat surface will always be a conical surface, and the front and rear spherical seats will resist axial and radial forces. It will be stiffly opposed by the function of the suppressing and fixing means.

In the embodiment, the spherical seat centered at the center point C presses the washer on the nut side to hold the support body 5 on the headstock body 3, but all the washers with the spherical concave seat are oriented in the same direction. A spherical protrusion in the same direction is provided on the support body side to press the support body 3 in one direction toward the rear.

It is also possible to adjust and fix the support body 3.

In the embodiment, the support is fixed by the disc spring 23, but the means for fixing the support by pressing the spherical seat is not limited to the embodiment.

〔Effect of the invention〕

This invention provides a support body that accommodates a bearing that supports the grindstone spindle and is attached to the grindstone spindle body, and a grindstone spindle body through which the support body is loosely inserted, in the vicinity of the center of the grindstone in the axial direction. A grinding wheel headstock of a grinding machine is provided with a spherical seat having a common center point and on which the support body can be tilted, and means for fixing the support body by pressing each of the spherical seats on the grinding wheel headstock. Therefore, even if the inclination of the grinding surface of the grindstone is adjusted, the position of the grindstone hardly changes.

Since the front and rear parts are fixed by the spherical seat, the support is immobile and no vibration occurs in the grinding wheel.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the invention. °/... Machine base Co... Grinding wheel headstock 3... Grinding wheel head main body Tei... Grinding wheel spindle Yo... Support 6... Front bearing 7
・・Front bearing g・・Rear bearing 9・・Quill 10・
・Rotation stop /l・・Button・・front cradle /
3... Rear cradle /lI... Case 15... Tsuba 16
・・Nut / ・・・Washer ・・・・Nut / ・・・・Washer ・・Whetstone ・・Inclination adjustment screw ・・・Disc spring 24I・・Thrust bearing ・・・Worm wheel ・・Rotation drive device Core Warm Cob...
Bracket 3/Fist/Bearing 3...Pulley J3/Center shaft joint 3g...Slide key 3j...Motor J6...
7'-+), 37...Belt 3...Cutting fluid supply piping

Claims (1)

[Claims] 1. A support body that accommodates a bearing that supports the grindstone spindle and is attached to the grindstone headstock body, and a grindstone spindle body through which the support body is loosely inserted, in the vicinity of the center of the grindstone in the axial direction at a position before and after the grindstone spindle. A grinding wheel headstock for a grinding machine, comprising: a spherical seat having a common center point and on which the support body can tilt; and means for fixing the support body to the grindstone headstock by pressing each of the spherical seats.