JPS6393560A - Non-circular honing device - Google Patents

Abstract

PURPOSE:To permit grinding while profiling a non-circular inner surface, by controlling a moving means in response to a sensing signal of a rotational speed of a second spindle and setting a rocking locus formed of a reciprocating motion of a rocking table caused by the moving means 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 hone head 8 mounted on a first spindle 7 of a grindstone unit 2 is reciprocated in an axial direction of a workpiece 3, while a workpiece holding unit 4 is driven to rotate a second spindle 34. A moving means controlled in response to a sensing signal of a rotational speed of the second spindle 34 reciprocates a rocking table 31 in synchronism with a rotational motion of the second spindle 34. Thus, an arrangement is such that a rocking locus formed of the reciprocating motion of the rocking table 31 and the rotational motion of the second spindle 33 is caused 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.

(Conventional technology).

Honing finishing is a method of finishing the workpiece surfaces, such as the inner diameter surface of a hole or the outer diameter surface of a cylinder, which have been finished by precision boring or grinding, and also improves the machining accuracy of the surface. This is a finishing method in which a 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 a workpiece surface with excellent roughness, along with lap finishing and super finishing.

And compared to other precision finishes, the 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 internal combustion engine cylinders, gun barrels, etc.

A honing machine is a special machine tool that performs this honing finish. There are various specialized machines for honing machines depending on the workpiece, but the general basic structure is equipped with a bone head that holds several fine-grained grinding wheels, and there is a relative distance between the horn head and the workpiece. The grindstone is rotated and reciprocated, a predetermined pressure is applied to the grindstone, and a large amount of working fluid is poured at the same time to machine the surface of the workpiece.

(Problems to be Solved by the Invention) By the way, the conventional honing process involves adding T to the surface of a cylinder whose cross section has a perfect circular shape. The shapes of the surfaces of workpieces have also become more diverse, and for example, honing is now required for the inner diameter surfaces of workpieces with non-perfectly circular cross sections, such as the inner diameter surface of the rotor housing of the D-Clean engine. It's coming.

However, conventional honing machines cannot be used structurally to finish the inner surface of a workpiece with a non-perfect circular cross section. could not be faithfully imitated, and improvements were desired.

(First Step to Solve the Problems) The present invention has been made in view of such conventional problems, and the honing device of the present invention combines a grindstone device that drives a grindstone and a workpiece. a workpiece holding device for holding and driving the workpiece; a horn 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; A rocking table is movably provided on a base of the apparatus, and a moving means for moving the rocking table is provided, and a second main shaft to which the workpiece is attached is rotatably provided on the rocking table. and the second
A control means is provided for detecting the rotational speed of the main shaft and controlling the operation of the moving means based on the detection signal, and is formed by the reciprocating movement of the rocking table by the moving means and the rotational movement of the second main shaft. It is characterized in that the swing locus is set to match the contour of the non-perfect circular inner surface of the workpiece attached to the second spindle.

For example, the moving means is a pulse motor, and
The control means includes a rotary encoder that rotates in synchronization with the main shaft.

(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 second main shaft rotates due to the drive of the workpiece holding device, and the second main shaft reciprocates in synchronization with the rotational movement of the rocking table due to the action of the moving means. 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 grindstone of the horn head grinds the inner surface of the workpiece while tracing the non-round inner surface of the workpiece.

(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
The grindstone device 2 is of a vertical type and has a structure in which the grindstone device 2 is installed above the workpiece holding device 4. Note that the workpiece 3 is a workpiece having a hole 6 with a non-perfect 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 a downward direction, and is connected to a drive cylinder (not shown). This allows the first main shaft 7 to reciprocate in the vertical direction. Further, the auxiliary slide 10 is capable of sliding vertically on the device main body 11, and has a mandrel guide 12 fixed to its lower end.
The rod river 3a of the drive cylinder 13 is connected to this. This allows the auxiliary slide 10 to reciprocate in the vertical direction. Therefore, the first main shaft 7 is moved up and down to the machining position by the auxiliary slide 10, and at the same time, the slide table 9 is used to reciprocate up and down during machining.

The bone head 8 includes a mounting body 14, a mandrel 15, a wafer 16, and a grindstone holder 17 for holding the grindstone 1, and the bone head 8 is attached to the first main shaft 7 via a bearing 18. , 2 The first main shaft 7 is capable of reciprocating in the axial direction of the workpiece 3.

The main body 14 of the tray 1 is composed of a mounting shaft portion 19 and a mandrel mounting portion 20 provided at the tip of the mounting shaft portion 19,
It has a cylindrical shape with a guide hole 21.21 extending therethrough. The base end (upper end) of the shaft portion 19 is connected to the first main shaft 7.
It is pivotally supported via the bearing 18. In addition, the guide hole 21 of the mandrel attachment part 20 has the mandrel 1
5 is attached with a mounting bolt 22.

As shown in FIG. 2, the mandrel 15 is formed into a rod shape with a U-shaped cross section, and has a guide hole 23 communicating with the guide holes 21 and 21. The guide hole 2
3, an edge 16 marked with "-" is slidably attached thereto, and a grindstone holder 17 is attached to the tip (lower end) of the mandrel 15 so that it can protrude and retract in the radial direction.

The wafer 16 has an inclined surface 16a, which is slidably engaged with the inclined surface 7a of the grindstone holder 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 has a drive cylinder rod 26 at its upper end.
is in contact. As a result, the operating rod 24 moves up and down within the guide hole 23 to raise and lower the wafer 16, and causes the grindstone holder 17 to protrude and retract 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 moving means 32, a control means 33, a second main shaft 34, and the like as main parts.

A rod 35a of a drive cylinder 35 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 B of the second spindle 34.
It is said that it is possible to move on the top.

The working position WA is set by a positioning device 36, and this set position is articulated by an adjustment pole 36a.

The rocking table 31 is movably provided on the base 30 via a hair ring 37.37, and the second main shaft 34 is rotatably supported on the rocking table 31 by a bearing 38.38. . A jig 39 is attached to the upper end 34a of the second main shaft 34, and the workpiece 3 is detachably attached to this jig 39. Further, the drive gear 40 of the second main shaft 34 is meshed with the drive gear 42 of an intermediate shaft 41 which is rotatably arranged in parallel with the second main shaft 34 and whose axis is parallel to the second main shaft 34 . The redrive gear 40.4
2 has a gear ratio of 1:1, so that the intermediate shaft 41 and the second main shaft 34 are linked so as to rotate at the same rotational speed. Further, the intermediate shaft 41 is linked to a drive shaft 46a of a drive motor 46 via a pulley 43, a transmission belt 44, and a pulley 45, and a rotary encoder 47 is provided at the lower end.

The moving means 32 is for moving the rocking table 31, and specifically consists of a pulse motor.

The pulse motor 32 is installed on one end 30a of the base 30 via a mounting bracket 48, and its drive shaft 32a is formed in the shape of a bolt with a predetermined threaded pinch. One end 31a of
It is screwed into a fitting threaded portion 49 provided in the body so that the shrimp can move forward and backward. When the drive shaft 32a of the pulse motor 32 rotates forward and backward, the rocking table 31 reciprocates in the left-right direction in FIG. 1.

The control means 33 is for detecting the rotational speed of the second main shaft 34 and for controlling the operation of the moving means 32 based on the detected signal. However, it is an NC (numerical control) system equipped with an electrical control device.

When the rotary encoder 47 rotates in synchronization with the second main shaft 34, the control means 33 outputs a corresponding detection signal (control signal) as an electrical pulse signal to the pulse motor 32, and The motor 32 is configured to rotate forward and backward by a predetermined rotation angle, and as a result, the rocking table 31 reciprocates in synchronization with the rotational movement of the second main shaft 34. However, the rocking table 3
The oscillation locus formed by the reciprocating motion of step 1 and the rotational motion of the second main shaft 340 is the non-round inner surface 6a of the workpiece 3 (
(see Figure 2).

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 device 2 is lowered, and the mandrel guide 12 is inserted into the nozzle 6 of the workpiece 3 fixed to the second main shaft 34 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 bone head 8 is inserted into the hole 6.

- Due to the action of the wedge 16 by the operating rod 24, the grindstone holder 17 protrudes outward in the radial direction, and the grindstone holder 1
The grinding wheel 1 of No. 7 abuts against the non-round inner surface 6a of the hole 6 of the workpiece 3 with a predetermined pressure.

■ In this pressurized state, the second main shaft 34 rotates, and at the same time, the pulse motor 3
2 operates in synchronization with the rotational movement of the second main shaft 34, and the rocking table 31 reciprocates in synchronization with the rotational movement of the second main shaft 34, and due to this reciprocating movement and rotational movement, the hole 6 is rotated. An operation is performed having a swing locus that matches the outline of the non-perfect circular inner surface 6a.

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 6a 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, the grindstone holder 17 retracts into the mandrel 15, and then the first spindle 7 retreats upward, machining the horn head 8. The workpiece 3 is pulled out from the hole 6 and the workpiece 3 is replaced.

This replacement of the workpiece 3 is carried out at the mouth of the drive cylinder 35
5a is retracted, the rocking table 31 is moved from the working position A to the replacement position B, and after the replacement, the rod 35 is moved again.
a 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 described in detail above, according to the present invention, the grinding wheel device and the workpiece holding device are driven in synchronization with each other, and by driving the grinding wheel device, the workpiece holding device provided on the first main shaft of the grinding wheel device is While the horn head reciprocates in the axial direction of the workpiece, the second main shaft rotates due to the drive of the workpiece holding device, and the rocking table rotates the second main shaft due to the action of the moving means. The reciprocating motion is synchronous, and as a result, the oscillation locus formed by the reciprocating motion of the rocking table and the rotational motion of the second spindle causes the non-round inner surface of the workpiece attached to the second spindle to Since the grinding wheel of the horn head is configured to match the contour of the -F workpiece, it is possible to grind the non-perfect circular inner surface of the workpiece while following it.

Therefore, it is possible to fully cope with the diversification of the surface shape of workpieces (for example, the inner diameter surface of the loaf housing of a loaf cleaner engine) due to recent technological advances, and as a result, the workpiece has a non-round cross section. Honing finish can also be applied to the inner diameter surface of the workpiece.
Extremely useful.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a non-round inner surface honing device of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1. 1... Grinding wheel, 2... Grinding wheel device, 3... Workpiece, 4
...Workpiece holding device, 6...Workpiece hole, 7...
First spindle, 8... Horn head, 17... Grinding wheel holder, 30... Base, 31... Rocking table, 32... Moving means (pulse motor), 33... Control means , 34・
...Second spindle, A...Working position, B...Replacement position

Claims (2)

[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 moving means for moving the rocking table is provided, and the rocking table is movably movable in the axial direction. , a second spindle to which the workpiece is attached is rotatably provided, a control means for detecting the rotational speed of the second spindle and controlling the operation of the moving means based on a detection signal thereof, and controlling the movement of the moving means by the moving means. A rocking locus formed by the reciprocating motion of the rocking table and the rotational motion of the second spindle is set to match the contour of the non-perfect circular inner surface of the workpiece attached to the second spindle. A honing device for a non-perfect round inner surface. (2) The honing device for a non-perfect circular inner surface according to claim 1, wherein the moving means is a pulse motor, and the control means includes a rotary encoder that rotates in synchronization with the main shaft.