JPS6393559A - Non-circular honing device - Google Patents

Abstract

PURPOSE:To permit grinding while profiling a non-circular inner surface, by setting a rocking locus formed of a reciprocating motion of a rocking table caused by a cam mechanism and a rotational motion of a second spindle in such a manner that it coincides with a contour of a non-circular inner surface of a workpiece mounted on the second spindle. CONSTITUTION:A grindstone unit 2 and a workpiece holding unit 4 are synchronously driven each other, driving of the grindstone unit 2 causing a hone head 8 mounted on a first spindle 7 to reciprocate in an axial direction of a workpiece 3, while driving of the workpiece holding unit 4 causing a second spindle 33 to rotate. A cam mechanism 32 causes a rocking table 31 to reciprocate in synchronism with a rotational motion of the second spindle 33 for thereby allowing a rocking locus formed of the reciprocating motion of the rocking table 31 and the rotational motion of the second spindle 33 to coincide with a contour of a non-circular inner surface of a workpiece mounted on the second spindle 33. As a result, a grindstone of the hone head 8 can effect grinding while profiling the non-circular surface of the workpiece 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a honing device, and more particularly to a honing device used for finishing the inner surface of a workpiece having a non-perfectly circular inner surface.

(Prior art) Honing finishing is aimed at smoothing the surfaces of workpieces, such as the inner diameter surface of a hole or the outer diameter surface of a cylinder, which have been finished by precision boring, grinding, etc., as well as improving the machining accuracy of the surface. This is a finishing method in which a square rod-shaped fine-grained grindstone is brought into surface contact with the surface of the workpiece for light grinding, and it is one of the precision finishing methods that can create the most excellent workpiece surface, along with lap finishing and super finishing.

And, compared to other precision finishes, honing finish is
It has outstanding advantages such as being able to perform high-precision machining without directly relying on the accuracy of machine tools, and having the ability to improve not only roundness but also straightness. It is generally used as a finishing method for the inner diameter surfaces of engine cylinders, gun barrels, etc.

There is a honing machine as a special T-machine machine that performs this honing finish.6 There are various special honing machines for different workpieces, but the general basic structure is a horn head that holds several fine-grained grindstones. The above-mentioned It is designed to work on the surface of the workpiece.

(Problems to be Solved by the Invention) By the way, conventional honing processing involves machining a cylindrical surface with a perfect circular cross section, but with recent technological advances, The shapes of honing tools have become increasingly diverse, and honing is now required even for the inner diameter surface of workpieces that have a non-circular cross section, such as the inner diameter surface of the rotor housing of a rotary engine.

However, conventional honing machines cannot be structurally applied to finish the inner surface of a workpiece having a non-perfect circular cross section. It was not possible to faithfully imitate the inner diameter surface, and improvements were desired.

(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and the honing device of the present invention comprises a grindstone device for driving a grindstone, and a workpiece for holding and driving a workpiece. A pawn head equipped with a grindstone is provided on the first main shaft of the grindstone device, the horn head is capable of reciprocating in the axial direction of the workpiece, and the horn head is mounted on the base of the workpiece holding device. A rocking table is movably provided on the rocking table, a camshaft and a second main shaft are arranged side by side on the rocking table with their axes parallel to each other, and the camshaft and the second main shaft are linked so as to be rotatable at the same rotational speed. A cam mechanism is configured by a cam provided on the cam shaft and a cam follower provided on the base, and is formed by the reciprocating movement of the rocking table by the cam mechanism and the rotational movement of the second main shaft. The swing locus is set to match the contour of the non-perfect circular inner surface of the workpiece attached to the second spindle.

(Operation) The grindstone device and the workpiece holding device are driven in synchronization with each other. By driving the grindstone device, the horn head provided on the first main shaft of the grindstone device reciprocates in the axial direction of the workpiece. On the other hand, the workpiece holding device rotates the second main shaft, and the cam mechanism causes the rocking table to reciprocate in synchronization with the rotation of the second main shaft. As a result, the rocking locus formed by the reciprocating motion of the rocking table and the rotational motion of the second spindle matches the contour of the non-perfect circular inner surface of the workpiece attached to the second spindle, The grinding wheel of the horn head grinds the inner surface of the workpiece while following the non-perfectly circular inner surface.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A non-round inner surface honing device according to the present invention is shown in FIG.
and a workpiece holding device 4 for holding and driving the workpiece,
The workpiece holding device 4 is installed on the floor surface 5, and
This is a marriage type structure in which the grindstone device 2 is installed above the workpiece holding device 4. The workpiece 3 is a workpiece having a hole 6 with a non-circular cross section, such as a rotor housing of a rotary engine.

The grindstone device 2 includes a first main shaft 7 and a horn head 8 provided on the first main shaft 7 as main parts.

The first main shaft 7 is fixed to a slide base 9, and the slide base 9 is attached to an auxiliary slide 10 so as to be slidable in the vertical direction, and is connected to a drive cylinder (not shown). This allows the first main shaft 7 to reciprocate in the vertical direction. In addition, the above auxiliary slide 1
The mandrel guide 12 is fixed to the lower end of the mandrel guide 12, and the rod 13a of the drive cylinder 13 is connected to this. This allows the auxiliary slide 10 to reciprocate in the vertical direction. Therefore, the first earth shaft 7 is moved up and down to the processing position by the auxiliary slide 10, and the up and down reciprocating movement during processing is carried out by the slide table 9.
It is done by.

The horn head 8 includes a mounting body 14, a mandrel 15, a wafer 16, and a grindstone holder 17 for holding the grindstone 1. The horn head 8 is attached to the first main shaft 7 via a bearing 18, and The workpiece 3 can be reciprocated in the direction of the axis of the workpiece 3 by the action of the main shaft 7.

The mounting body 14 is composed of a mounting shaft portion 19 and a mandrel mounting portion 20 provided at the tip of the mounting shaft portion 19, and has a cylindrical shape with a guide hole 21, 21 provided therethrough. The base end (upper end) of the mounting shaft portion 19 is pivotally supported by the first king shaft 7 via the bearing 18 . Further, the mandrel 15 is attached to the guide hole 21 of the mandrel attaching portion 20 with an attaching bolt 22.

As shown in FIG. 2, the mandrel 15 is formed into a rod shape with a U-shaped cross section, and the mandrel 15 is formed into a rod shape with a U-shaped cross section.
A guide hole 23 is formed which communicates with the. An edge 16 marked with -1 is slidably attached to the guide hole 23, and a grindstone holder 17 is installed at the tip (lower end) of the mandrel 15 so as to be able to protrude and retract in the radial direction. ing.

The wafer 16 has an inclined surface 16a, which slidably engages with the inclined surface 17a of the grindstone boulder 17, and an operating rod 24 is connected to the upper end surface 16b. The operating rod 24 is constantly urged upward by a return spring 25, and a rod 26 of a drive cylinder is in contact with the upper end. As a result, the operating rod 24 is inserted into the guide hole 23.
The wafer 16 is raised and lowered by moving up and down within the shaft, and the grindstone holder 17 is projected and retracted in the radial direction.

The whetstone 1 is attached to the outer end of the whetstone holder 17, and the whetstone 1 is attached to the outer end of the whetstone holder 17.
Specifically, it is said to be a square rod-shaped fine-grained whetstone.

The workpiece holding device 4 includes a base 30, a swing table 31, a cam mechanism 32, and a second main shaft 33 as main parts.

A rod 34a of a drive cylinder 34 is connected to one end 30a of the base 30, and when replacing the workpiece 3, the base 30 is connected to the floor surface 5 between the work position A and the replacement position iB of the second spindle 33.
It is said that it is possible to move on the top.

Note that the working position A is set by a positioning device 35, and this set position is adjusted by an adjustment bolt 35a.

The rocking table 31 is movably provided on the base 30 via hair rings 36, 36, and the rocking table 31 is provided with the second
The main shaft 33 is rotatably supported by bearings 37.37. A handle 38 is attached to the upper end 33a of the second main shaft 33, and the workpiece 3 is detachably attached thereto. Further, the drive gear 39 of the second main shaft 33 is connected to the drive gear 41 of the camshaft 40 which is arranged in parallel with the second main shaft 33 with its axis parallel to the second main shaft 33.
are meshed with. The redrive gears 39 and 41 have a gear ratio of 1:1, so that the camshaft 40 and the second main shaft 33 are linked to rotate at the same rotational speed. The camshaft 40 also includes a pulley 42 and a transmission belt 43.
, is connected to a drive shaft 45a of a drive motor 45 via a pulley 44, and a cam 46 is provided at the lower end.

The cam 46 is a cam follower 4 provided on the base 30.
7 constitute a cam mechanism 32.

The contour of the cam surface, that is, the outer peripheral surface 48 of the cam 46 is formed into a non-perfect circle that is congruent with the contour of the inner diameter surface 6a of the hole 6 of the workpiece 3 (see FIG. 2), and the cam follower 47 is It is rotatably supported on a support shaft 49 attached to the stand 30.

Therefore, due to the rotation of the camshaft 40, the cam surface 4
8 rolls into contact with the outer peripheral surface of the cam follower 47, the rocking table 3
1 rotates the base 30 in synchronization with the rotational movement of the second main shaft 33.
It will move back and forth on the top. As a result, the rocking locus formed by the reciprocating motion of the rocking table 31 and the rotational motion of the second main shaft 33 coincides with the contour of the non-round inner surface 6a of the workpiece 3. Note that 50 is a resilient spring for bringing the cam 46 into contact with the cam follower 47 at the time.

Next, a description will be given of the operation procedure for honing using the non-round inner surface honing device configured as described above.

(2) The auxiliary slide 10 of the grindstone bag W2 is lowered, and the mandrel guide 12 is inserted into the hole 6 of the workpiece 3 fixed to the second main shaft 33 of the workpiece holding device 4. Thereafter, as the slide table 9 is lowered, the first main shaft 7 projects downward, and the mandrel 15 of the horn head 8 is inserted into the hole 6.

- Due to the action of the wedge 16 by the operating rod 24, the grinding wheel holder 17 protrudes half way (outward in the strip direction), and the grinding wheel 1 of the grinding wheel holder 17 applies a predetermined pressure to the non-round inner surface 6a of the hole 6 of the workpiece 3. come into contact with

(2) In this pressurized state, the second main shaft 33 rotates, and the cam mechanism 32 operates in synchronization with this, causing the rocking table 31 to reciprocate horizontally (left and right in FIG. 1); Through this reciprocating motion and rotational motion, a motion having a swing locus that matches the contour of the non-perfect circular inner surface 6a of the workpiece 3 is performed.

On the other hand, the first spindle 7 reciprocates in the axial direction of the workpiece 3, that is, in the vertical direction, by the operation of the slide table 9.

As a result, the grindstone 1 of the grindstone holder 17 lightly grinds the non-round inner surface 6a of the hole 6 while following the same.

(2) When the non-round inner surface of the hole 6 is ground to a predetermined inner diameter dimension, this is detected by a conventionally known automatic sizing device or the like, and the grinding wheel device 2 and workpiece holding device 4 are stopped. Then,
Due to the action of the return spring 25, the operating rod 24 returns upward, and the grinding wheel holder 17 retracts into the mandrel 15. After this, the first spindle 7 retreats upward, and the horn head 8 is moved back to the workpiece 3. The work piece 3 is removed from the hole 6 and the work piece 3 is replaced.

This exchange of the workpiece 3 is carried out using the rod 34 of the drive cylinder 34.
a moves back and forth, the swinging table 31 moves from the working position to the replacement position B, and after the replacement, the rod 34a is moved again.
protrudes, and the swing table 31 is moved back to the working position A.

■ After that, repeat the steps from ■ to ■.

(Effects of the Invention) As detailed above, according to the present invention, the grinding wheel device and the workpiece holding device are driven in synchronization with each other, and the horn head provided on the first spindle is driven by the driving of the grinding wheel device. While the workpiece reciprocates in the axial direction, the workpiece holding device rotates the second spindle, and the cam mechanism causes the rocking table to reciprocate in synchronization with the rotation of the second spindle. This causes the reciprocating movement of the rocking table and the second
The swing locus formed by the rotational movement of the main shaft is
Since it is configured to match the contour of the non-perfect circular inner surface of the workpiece attached to the main shaft, the grinding wheel of the horn head can perform VR control on this inner surface while following the non-perfect circular inner surface of the workpiece. .

Therefore, it is possible to fully cope with the diversification of surface shapes of workpieces (for example, the inner diameter surface of the rotor housing of a rotary engine) accompanying recent technological advances, and this makes it possible to handle workpieces with non-circular cross sections. Honing finish can also be applied to the inner diameter surface of objects.
Extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a honing device for a non-perfect round inner surface of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1.

Claims (1)

[Claims] (1) A grindstone device that drives a grindstone and a workpiece holding device that holds and drives a workpiece, a horn head equipped with a grindstone is provided on a first spindle of the grindstone device, and the horn head is attached to a workpiece. A rocking table is movably provided on the base of the workpiece holding device, and a cam shaft and a second main shaft are arranged side by side on the rocking table with their axes parallel to each other. The cam shaft and the second main shaft are linked to each other so as to be able to rotate at the same rotational speed, and a cam mechanism is configured by a cam provided on the cam shaft and a cam follower provided on the base, and the cam A rocking locus formed by the reciprocating motion of the rocking table by the mechanism and the rotational motion of the second spindle is set to match the contour of a non-perfect circular inner surface of a workpiece attached to the second spindle. A honing device for a non-perfect round inner surface.