JPH09136254A - Groove grinder - Google Patents

Abstract

(57) [Summary] A vertically oriented tool shaft 13 shown by an imaginary line is displaced by 90 ° to a horizontally oriented tool shaft 13 shown by a solid line.
Groove grinding is performed in the state of the vertical tool shaft 13 indicated by the imaginary line, and the grindstone 1 is performed in the state of the horizontal tool shaft 13 indicated by the solid line.
4. Dressing 4 is performed. [Effect] Since groove grinding is performed with the tool shaft facing downward and vertically, there is no concern that the tool shaft will bend under the influence of gravity, and machining accuracy will be good. Further, the dressing mechanism can be easily arranged because dressing of the grindstone is carried out with the tool axis oriented laterally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groove grinder for machining a longitudinal groove on the outer peripheral portion of a shaft member.

[0002]

2. Description of the Related Art FIG. 11 is a side view of a fixed pulley for a continuously variable transmission, and a fixed pulley 100 has a plurality of spline grooves 102 ... (. .). A movable pulley (not shown) is attached to the shaft 101, and the movable pulley and the spline groove 102 are attached.
By interposing a steel ball between and, it is possible to move in the axial direction while restraining the rotation of the movable pulley. The spline groove 102 for that purpose is roughly processed in a forging process, and is finished by a grindstone in a finishing process.

FIG. 12 is a principle diagram of a conventional horizontal spline groove grinder. In this type, a grindstone shaft 104 is horizontal, a grindstone 105 is attached to the tip of this grindstone shaft 104, and the grindstone 105 splines the shaft 101. The grooves 102 ... Are ground. The white arrow indicates the cutting direction. Also, the grindstone 10
If the shape of the cross-section of No. 5 is unacceptably collapsed due to wear, the grindstone 105 is re-polished by a repairing means called a rotary dresser 107 shown in the upper left of the drawing. The rotary dresser 107 is attached to the work holding side and re-polishs while swinging by a certain angle.

FIG. 13 is a principle diagram of a conventional vertical type spline groove grinder. In this type, a grindstone shaft 108 is oriented vertically, and a grindstone 109 is attached to the tip (lower end) of the grindstone shaft 108, and this grindstone 109 is provided. With shaft 101 and spline groove 102
... is ground. The white arrow indicates the cutting direction.

[0005]

Although the horizontal type spline groove grinder is suitable for mounting the rotary dresser 107, since the grindstone shaft 104 is horizontal and the grindstone 105 is held in a cantilevered manner, the grindstone 105 is likely to be displaced in the vertical direction, which causes a problem in processing accuracy.

In this respect, the vertical spline groove grinder is not easily affected by gravity. However, Rotri Dresser 107
Is difficult to install. Specifically, the rotary dresser 107
Even if is attached to the work holding side, the axis of the rotary dresser 107 must be vertical and swing, and each element on the work holding side (headstock, tailstock, etc.) is arranged horizontally. It is difficult to arrange the rotary dresser 107 because it is necessary to add a mechanism for moving the rotary dresser in the vertical direction. Therefore, an object of the present invention is to provide a groove grinder capable of satisfying both groove machining accuracy and ease of dresser layout.

[0007]

In order to solve the above problems, the present invention provides an index unit for indexing at a constant angle while gripping one end of a shaft-like work, and the work in cooperation with the index unit. A tailstock for holding the slider, a slider for holding the index unit and the tailstock, a movable bed for horizontally holding the slider so as to be movable in the axial direction or the direction perpendicular to the axis of the workpiece, and this movable bed for the workpiece. The main bed that holds the tool bed equipped with a grindstone at a high speed, and the main bed that holds horizontally so that it can move in the axis-perpendicular direction or in the axis direction, and the tool rotating section to turn the tool axis from downward to sideways. A tool swivel column that swingably holds a horizontal swivel shaft, and a drain mounted on the slider side to shape a grindstone mounted on a horizontal tool shaft. Constituting the groove grinding machine and a single mechanism.

Since the tool axis is oriented downward and the groove is ground, there is no fear of the tool axis bending under the influence of gravity.
Good processing accuracy. Also, with the tool axis facing sideways,
Since the whetstone is dressed, the dressing mechanism can be easily arranged.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a front view of a groove grinder according to the present invention. The groove grinder 1 includes a lower main bed 2 and a feed screw 3 on the main bed 2 via a rail 2a and a V groove 2b. A movable bed 4 that horizontally moves in the front-back direction of the drawing, a drive unit 6a incorporated in the movable bed 4, a ball screw 6b,
A feed mechanism 6 including a nut 6c, and the feed mechanism 6
Of the slider 7, which horizontally reciprocates on the movable bed 4 in the left-right direction in the drawing, the index unit 8 and the tailstock 9 arranged on the slider 7, and the tool revolving column 11 in the upper part of the drawing around the horizontal axis. From a tool rotating part 12 supported so as to be swingable by 90 °, a grindstone 14 attached to the tip of a tool shaft 13 of the tool rotating part 12, and a dressing means 16 integrally attached to the tailstock 9. Become. The dressing means 16 is, for example, a rotary dresser.

Although the index unit 8 corresponds to the headstock of a normal lathe, it does not have a mechanism for rotating the work at a high speed like the headstock, and is a unit for positioning the work every 120 °. If a work W having the same shape as that described in FIG. 11 is sandwiched between the index unit 8 and the tailstock 9, the work W can be moved left and right in the figure by the action of the feed mechanism 6, and the action of the feed screw 3 can be performed. You can move to the back and front of the figure.

FIG. 2 is a side view of the groove grinding machine according to the present invention. The moving bed 4 on the main bed 2 is moved left and right in the figure by the feed action of the feed screw 3, and the slider 7 on the moving bed 4 is moved.
Indicates that the ball screw 6b moves through the rail 4a and the V groove 4b in the direction of the front and back of the figure, and the dressing means 16 is integrally attached to the tailstock 9 on the slider 7. In the figure, at the back of the dressing means 16,
There is a tool turning column 11, a tool rotating part 12, a tool shaft 13 and a grindstone 14.

FIG. 3 is an enlarged view of the essential parts of the tool swivel column according to the present invention. The tool swivel column 11 is a swivel shaft 11 having a large diameter.
a. A large umbrella member 1 is attached to the tip of the turning shaft 11a.
1b is attached, and the tool rotating part 1 is attached to the tip of the umbrella member 11b.
2 is fixed with bolts 12a ... And the turning shaft 11a is rotated by a drive unit (not shown), so that the vertical tool shaft 13 shown by an imaginary line extends to the horizontal tool shaft 13 shown by a solid line. It can be displaced by 90 °. The tool rotating unit 1
2 has a built-in high-speed motor and rotates the tool shaft 13 at high speed. The position of the imaginary line is the "grinding position" and the position of the solid line is the "dressing position".

Although not shown in FIG. 1, the tool rotating portion 12 is provided with a grindstone displacement detecting unit 20. Although the detailed structure of the grindstone displacement detection unit 20 will be described later, since the tool shaft 13 may expand due to thermal expansion or the like to change the position of the grindstone 14, the displacement amount is detected.

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1 and shows a mounted state of the rotary dresser 16 of the present invention. In the present embodiment, the rotary dresser 16 is attached to the tailstock 9 via the rocking base 17, and the rocking base 17 is moved from an imaginary line B to an imaginary line C about a point A by a rocking means (not shown). Shake greatly between.
The rotary dresser 16 mounted on the swing table 17 is
It is composed of a main body portion 16a having a built-in motor, a disc 16c attached to the tip of a motor shaft 16b, and chips 16d ... Planted on the disc 16c.

The operation of the above-described groove grinder will be described below. 5 (a) and 5 (b) are explanatory views of the grinding process according to the present invention. FIG. 5 (a) shows a workpiece W clamped between the index unit 8 and a tailstock 9 (not shown), and is turned downward about the vertical axis. The state in which the groove W1 is ground by the grindstone 14 rotating at high speed is shown in FIG. (B) is a bb line sectional view of the above (a), and shows a pattern in which the grooves W1 ... Of the work W are ground by the grindstone 14. After grinding one groove W1, the index unit shown in (a) rotates 120 ° to expose the next groove W1 to the grindstone 14.

FIGS. 6 (a) and 6 (b) are explanatory views of the dressing process according to the present invention. In FIG. 6 (a), the tool rotating portion 12 is rotated 90 ° as indicated by an arrow so that the tool shaft 13 and the grindstone 14 are moved. Hold in dressing position. The rotary dresser 16 is brought close to the grindstone 14 as indicated by the arrow. In (b), the tip 16d is brought into contact with the grindstone 14 and the disk 16c is swung ± 70 ° about a point A (this point A is the same as the point A in FIG. 4) as a swing center, while the grindstone is swung. Shape 14

Next, the grindstone displacement detection unit 20 will be described. FIG. 7 is a cross-sectional view of a grindstone displacement detection unit according to the present invention. The grindstone displacement detection unit 20 includes a sleeve 21 attached to the tool rotating portion 12 by a bracket (not shown),
A swivel shaft 23 rotatably attached to the sleeve 21 via bearings 22, 22, a rotary cylinder 24 that drives the swivel shaft 23, a lever-shaped probe 25 attached to the tip of the swivel shaft 23, and this measurement. The probe 25 includes a first sensor 26 that detects the position of the probe 25.
a, an air passage 25b, and a nozzle 25c. The nozzle 25c faces the grindstone 14. That is, the measuring element 25 is an air micrometer, and when air is ejected from the nozzle 25c, the air supply pressure changes according to the distance to the object in front of the nozzle 25c, so that the measuring tool can know the distance. is there.

FIG. 8 is a view on arrow 8 of FIG.
1 shows that the tool 1 is attached to the tool rotating unit 12 by the brackets 27 and 28. Reference master 29 at the base of bracket 28
Further, the second sensor 31 is provided at a position rotated by 90 ° from the first sensor 26. Nozzle 25c of probe 25
Although it faces the back surface of the grindstone 14 in the figure, the probe 25 is rotated 90 ° counterclockwise around the pivot shaft 23 to move the second point.
When the rotation is stopped based on the detection signal of the sensor 31, the nozzle 25c faces the reference master 25.

FIG. 9 is a view showing the relationship between the probe of the present invention and the reference master. The probe 25 is shown in the sectional view taken along line 9-9 of FIG.
It is the figure which added. The measuring element 25 is swung by the action of the rotary cylinder 24, and the nozzle 25c of the measuring element 25 is oscillated.
9 shows the state facing 9. The probe 25 is the reference master 29
, The origin can be corrected. After this correction, if the nozzle 25c faces the back surface of the grindstone 14 as shown in FIG. 8, the accurate position of the grindstone 14 can be measured.

10 (a) and 10 (b) are explanatory views of the operation of the grindstone displacement detection unit and the rotary dresser according to the present invention. (A) shows a new grindstone 14, which is attached to a predetermined position of the tool shaft 13 (see FIG. 9), and the center line L0 at that time is called the initial center line L0.

In (b), it is assumed that the grindstone 14 is displaced as indicated by an arrow due to thermal expansion or the like, and the displacement amount at that time is δ. After this displacement amount is measured by the tracing stylus 25, the rotary dresser 16 shown in FIG. That is, the profile of the grindstone 14 shown by the imaginary line in FIG. 10B is cut to the position indicated by the solid line. As a result, the center line La of the addendum of the grindstone 14A shown by the solid line is offset from the initial center line L0 by δ, and the displacement amount δ is offset, so that accurate groove grinding can be performed. .

Note that there is no need to offset from the initial center line L0 as long as the displacement amount δ does not affect the processing accuracy. As described above, the rotary dresser 16 according to the present invention performs not only the function of shaping the grindstone 14 shown in FIG. 6 but also the correction process for correcting the displacement amount.

The dressing mechanism 16 may be a full dresser in addition to the rotary dresser shown in the embodiment. Further, the work W is not limited to the fixed pulley described in the prior art, and all the shaft-like works that need to have a longitudinal groove on the outer peripheral surface are targeted. Similarly, the groove W1 is not limited to the spline groove, and all longitudinal grooves formed on the shaft outer peripheral surface are targeted.

[0024]

The present invention has the following effects due to the above configuration. According to a first aspect of the present invention, there are provided an index unit for performing indexing at a constant angle while gripping one end of a shaft-like work, a tailstock that cooperates with the index unit to clamp the work, and the index unit and the tailstock. A slider for holding, a moving bed for holding the slider horizontally and horizontally so that the slider can move in the axial direction or a direction perpendicular to the axis of the workpiece, and a moving bed for horizontally holding the movable bed so as to be movable in the direction perpendicular to the axis or the axial direction of the workpiece. A main bed, a tool rotating part for rotating a tool shaft equipped with a grindstone at high speed, and a tool swiveling column for holding the tool rotating part so that the tool rotating part can be swung by a horizontal swivel shaft so as to swivel the tool shaft from downward to sideways. , A groove grinder is composed of the dressing mechanism mounted on the slider side to shape the grindstone mounted on the horizontal tool shaft, and the tool shaft is mounted vertically downward. As the gas, so implementing the groove grinding, there is no fear that deflects under the influence tool axis of gravity, machining accuracy is improved. Further, the dressing mechanism can be easily arranged because dressing of the grindstone is carried out with the tool axis oriented laterally. Therefore, according to the present invention, accurate groove grinding and efficient grinding wheel dressing can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of a groove grinder according to the present invention.

FIG. 2 is a side view of the groove grinding machine according to the present invention.

FIG. 3 is an enlarged view of a main part of a tool swiveling column according to the present invention.

FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1, showing a mounted state of the rotary dresser 16 of the present invention.

FIG. 5 is an explanatory view of a grinding process according to the present invention.

FIG. 6 is an explanatory view of a dressing process according to the present invention.

FIG. 7 is a sectional view of a grindstone displacement detection unit according to the present invention.

FIG. 8 is a view on arrow 8 of FIG.

FIG. 9 is a diagram showing a relationship between a probe according to the present invention and a reference master.

FIG. 10 is an operation explanatory view of a grindstone displacement detection unit and a rotary dresser according to the present invention.

FIG. 11 is a side view of a fixed pulley for a continuously variable transmission.

FIG. 12: Principle diagram of a conventional horizontal spline groove grinder

FIG. 13: Principle diagram of a conventional vertical spline groove grinder

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Groove grinder, 2 ... Main bed, 3 ... Feed screw, 4 ... Moving bed, 6 ... Feed mechanism, 7 ... Slider, 8 ... Index unit, 9 ... Tailstock, 11 ... Tool turning column, 1
2 ... Tool rotating part, 13 ... Tool shaft, 14 ... Grinding stone, 16 ... Dressing mechanism (rotary dresser), 17 ... Swing base,
W ... Work, W1 ... Groove (spline groove).

Claims (1)

[Claims] 1. An index unit for indexing a fixed angle while gripping one end of a shaft-like work, a tailstock that cooperates with the index unit to clamp the work, and these index units and tailstocks. Holding the slider, a moving bed that holds the slider horizontally and horizontally so that it can move in the axial direction or the axis perpendicular to the workpiece, and a movable bed that can horizontally move the moving bed in the axis orthogonal or axial direction of the work. Main bed, a tool rotating part that rotates a tool shaft equipped with a grindstone at high speed, and a tool swiveling column that holds the tool rotating part so that the tool shaft can be swung by a horizontal swivel shaft so as to swivel the tool shaft from downward to sideways. When,
A groove grinder comprising a dressing mechanism mounted on the slider side for shaping a grindstone mounted on a lateral tool shaft.