JP2972166B2 - Honing head device and honing device for non-circular inner surface - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a honing head device and a honing device for a non-circular inner surface, and more particularly, to a honing process for a non-cylindrical inner surface such as an inner diameter surface of a vane pump or a non-circular inner surface with high accuracy. Related to honing technology.

[0002]

2. Description of the Related Art Honing processing is for the purpose of smoothing the inner diameter surface of a workpiece (hereinafter referred to as a workpiece) finished by, for example, precision boring or grinding and also improving the processing accuracy of the inner diameter surface. This is a finishing method in which a square bar-shaped fine grain grinding wheel is brought into surface contact with the inner diameter surface of the work and lightly ground, and is one of precision finishes capable of producing the most excellent work surface together with lap finish and super finish.

[0003] Compared with other precision finishes, honing finishes enable high-precision machining without directly relying on the precision of machine tools, and the ability to improve straightness in addition to roundness. It has excellent advantages such as having an inner surface, and is particularly generally employed as a method for finishing an inner surface of a cylinder or a barrel of an internal combustion engine.

There is a honing machine as a dedicated machine tool for performing the honing finish. Honing machines have individual dedicated machines for each work, but the general basic structure is equipped with a honing head that holds several fine-grained stones,
While performing relative rotation and reciprocating motion between the honing head and the work, a predetermined pressure is applied to the grindstone, and at the same time, a large amount of the working fluid is poured while the work of the work surface is performed. Has been.

[0005]

By the way, with the recent progress of technology, the shape of the inner diameter surface of a work has been diversified, and for example, it has a non-circular cross section like the inner diameter surface of a vane pump. Honing has also been required for the inner diameter surface of the work.

However, in the above-mentioned general honing machine, due to the structure, the fine-grained grinding stone cannot faithfully follow the inner diameter surface of a work having a non-circular cross section, and the finishing of this kind of inner diameter surface is difficult. It could not be applied structurally to processing.

[0007] In this regard, the present applicant has disclosed in Japanese Unexamined Utility Model Publication No.
A honing device for a non-circular inner surface disclosed in Japanese Patent No. 109864 has already been proposed.

As shown in FIG. 8, the apparatus includes a honing head b detachably mounted on a main shaft a of a machine tool such as a honing machine. The honing head b includes a plurality of grinding wheel holders c and c. , ... is the horn body d
The grindstones e are provided so as to protrude and retreat in the radial direction, that is, in the radial direction. Each grindstone holder c has a base end surface serving as a pressure receiving surface that receives fluid pressure, for example, air pressure, supplied from a pressurized medium supply source (not shown) via the pressurized medium passage f and the pressurized medium reservoir chamber g. At the same time, it is constantly urged by the operating spring h in the whetstone retreating direction.

When air pressure is supplied from the pressurized medium supply source, the air pressure causes the grinding wheel holders c, c,
Project outward in the radial direction against the resilience of the operating springs h, h, and the grindstone e of each grindstone holder c is applied to the inner surface Wa having a non-circular cross section of the workpiece W with a predetermined constant pressure. At the same time, the main shaft a reciprocates in the axial direction of the work W while rotating. Thus, the grindstone e of each grindstone holder c grinds the inner diameter surface Wa while faithfully following the inner diameter surface Wa, that is, while repeatedly projecting and retracting in the radial direction from the horn body c.

In the honing process for the non-circular inner surface having a small diameter change, this apparatus configuration has good followability of the grindstone e with respect to the inner diameter surface Wa of the work, high processing accuracy is obtained, and the intended purpose is achieved. On the other hand, with respect to the non-circular inner surface having a large diameter change, the followability of the grindstone e is not yet sufficient, and further improvement has been demanded.

That is, in the configuration shown in FIG.
The grindstone holder c is configured to be linearly guided and moved in the radial direction with respect to the honing head b. Therefore, the change in the diameter of the inner diameter surface Wa of the work is directly changed to the grinding wheel e.
In other words, the moving distance of the grindstone holder c and the reaction force of the workpiece inner diameter surface Wa acting on each grindstone e at the time of honing processing have an angle in the moving direction of the grindstone e due to the relative rotational movement of the grindstone e and the work W. I have.

For this reason, if there is a structural dimensional error or gap between the sliding surface of the grinding wheel holder c and the honing head b,
The reaction force from the inner diameter surface Wa acts as an eccentric load on the relative movement of the sliding surface, and hinders the smooth movement. It becomes remarkable in the processing of. As a result, the grinding wheel e
Of the grinding wheel e
Not only does the contact pressure on the inner diameter surface Wa, that is, the honing processing pressure, vary, but also becomes stuck. In addition, a smooth relative rotation cannot be obtained due to the occurrence of a hook in the rotation direction between the two, and a desired uniform finishing accuracy can be obtained on the processing surface. I can't.

The present invention has been made in view of such a conventional problem, and an object thereof is to provide a honing technique capable of honing a non-circular inner surface such as an inner diameter surface of a vane pump with high accuracy. Is to provide. In the offer.

[0014]

In order to achieve the above object, a honing head device of the present invention is mounted on a honing device for honing a non-circular inner surface of a work, and a supporting arm has a workpiece inner diameter. The support arm is swingably supported in a direction perpendicular to the axis of the surface, and a whetstone is attached to the tip of the support arm. The wobble direction of the whetstone is determined by the inner diameter of the workpiece acting on the whetstone during honing processing. Are set in accordance with the direction of action of the reaction force.

In a preferred embodiment, the center of swing of the support arm is located outside the inner diameter surface of the work when viewed in the axial direction of the work, and based on a contact position between the grindstone and the inner diameter surface of the work. Are arranged on the upstream side in the direction of relative rotation with respect to.

A honing apparatus according to the present invention includes the above honing head apparatus, and hones a non-circular inner diameter surface of a work with a grindstone that performs relative rotation and reciprocating motion with the work. , Comprising a head portion having the honing head device, and a work holding portion for holding a work, preferably,
The head portion includes a support arm provided with the grindstone, and a pressing unit that presses the support arm in a grindstone cutting direction, on a head main body arranged coaxially with the inner diameter surface of the work held by the work holding portion. Be prepared.

As a preferred embodiment, there is provided a constant pressure holding means for holding the processing pressure of the grinding stone constant.

In the honing apparatus of the present invention, the supporting arm is pressed and oscillated in the cutting direction of the grindstone by the pressing means, so that the grindstone at the tip thereof is brought into contact with the inner diameter surface of the work with a predetermined constant pressure. In the contact state, the grinding wheel performs honing processing on the inner diameter surface of the work while rotating and reciprocating relative to the work.

In this case, since the inner diameter surface of the work has a non-circular cross section, the whetstone projects and retreats while following the inner diameter surface, that is, in response to a change in the diameter of the inner diameter surface of the work. When the honing process is performed while repeating the above, the projecting and retracting operation of the grinding stone is performed by swinging the support arm, and the swinging direction is set according to the direction of reaction of the reaction force on the inner diameter surface of the work Have been.

Therefore, the reaction force of the inner diameter surface effectively acts on the grindstone, so that the support arm is smoothly swung, and the projecting and retreating operation in the cutting direction of the grindstone is always stably obtained. Thereby, regardless of the magnitude of the change in the diameter of the inner diameter surface of the work, good followability of the grindstone to the inner diameter surface of the work is ensured.

Further, by providing a constant pressure holding means for holding the processing pressure of the grinding stone constant, the projecting and retreating operation of the grinding stone by the swing of the support arm is performed more smoothly, and as a result, the inner diameter surface of the work is reduced. Good followability of the grindstone with respect to the inner diameter surface of the work is ensured even when the diameter dimension change and the work rotation speed are particularly large.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIGS. 1 and 2 show a honing apparatus according to the present invention.
This honing device is specifically for finishing an inner diameter surface Wa of a workpiece W having a non-circular cross section, such as an inner diameter surface of a vane pump. The work holding unit 2 and the head unit 1 are reciprocated while the grindstones 4, 4,... It is configured to perform exercise (oscillation).

The head portion 1 is a portion forming a honing portion, and the head body 5 has support arms 7, 7,...
A plurality of sets (four sets in the illustrated embodiment) of a pressing cylinder device 8 as a pressing means for performing a cutting operation are mounted, and the above-mentioned grindstone 4 is attached to a tip portion of each support arm 7.

The head main body 5 has a cylindrical shape, and is arranged on a device main body (not shown) in a vertical state coaxially with a work holding portion 2 described later and an inner diameter surface Wa of a work W held by the work holding portion 2. I have. In the illustrated embodiment, the head body 5
Although not shown, it is mounted on an elevating table which is supported by the apparatus main body so as to be able to move up and down, and this elevating table is drivingly connected to an elevating cylinder 9 as head elevating means attached to the apparatus main body. This lifting cylinder 9
Employs a hydraulic cylinder using a fluid pressure such as an air pressure or a hydraulic pressure as a pressurizing medium, and in the drawing, a hydraulic cylinder using a hydraulic pressure is employed. When the elevating cylinder 9 is driven, the head body 5 and the honing head device 6 are moved together with the elevating table together with the inner surface W of the workpiece W.
Reciprocate (oscillate) in the axial direction of a.

The support arm 7 causes the grindstone 4 attached to the tip of the support arm 7 to abut against the inner surface Wa of the work W with a predetermined constant pressure, and is equally spaced in the circumferential direction of the inner surface Wa of the work W. A plurality is arranged. 2, a rectangular mounting flange 10 is integrally provided at the lower end of the head main body 5, and the support flange is provided at a position near the four corners of the mounting flange 10, as shown in FIG. Arms 7 are provided respectively.

The specific structure of the support arm 7 is shown in FIG. 3. The grinding wheel 4 is attached to a tip 7a of the support arm 7, and a base 7b of the support arm 7 is attached to an attachment flange 10 of the head body 5 so as to hang down. Pivotally supported by the provided support shaft 11,
The work W can swing in a direction perpendicular to the axis of the inner diameter surface Wa.

In the drawing, a base end portion 7b of the support arm 7 is rotatably supported on the support shaft 11 via a bearing 12, so that the support arm 7 can
Smooth swinging is performed in the horizontal direction with 1 as the swing center, and good followability of the grindstone 4 to the inner diameter surface Wa of the work W described later is secured.

In connection with this, the support arm 7
As shown in FIG. 1, the support shaft 11 supporting the base end portion 7b is set to have a long dimension extending down to the outer peripheral portion of a work holding body 26 of the work holding portion 2 described later together with the base end portion 7b. The lower ends of the support shafts 11, 11,... Are connected to each other by a support substrate 14. This maintains the vertical parallel state of the spindles 11, 11,..., And also supports the spindle arms 7,
The horizontal state of 7, ... is also maintained, and these support arms 7,
The stable horizontal swing state of 7,... Is ensured stably. The support substrate 14 is provided with an insertion hole 14a through which a work holder 26 of the work holding unit 2 described later can be inserted, so that the head unit 1 and the work holding unit 2 do not interfere with each other. .

An operating arm 13 branches off and is provided integrally with a base end portion 7a of the support arm 7. The distal end portion 13a of the operating arm 13 is provided with a pressing cylinder device 8 as described later. Function as a pressure receiving part.

Grinding wheel 4 for tip 7a of support arm 7
As shown in FIG. 3, in the mounting structure of FIG. 3, a grindstone holder 15 for integrally holding the grindstone 4 is fitted into a holding pocket 16 of the tip portion 7a, and is removably fastened and fixed by a fastening bolt 17. The whetstone 4 has a structure that can be replaced together with the whetstone holder 15.

The grinding wheel 4 is opposed to the inner diameter surface Wa, that is, viewed in the axial direction of the inner diameter surface Wa of the work W (in FIG. 3, perpendicular to the paper surface). It is arranged outward. As the grindstone 4, a fine-grain grindstone having a convex arc-shaped grindstone surface extending in parallel with the axis of the inner diameter surface Wa is used, and the specific shape and dimensions of the grindstone surface are determined by the inner diameter of the target work W. A profile having a profile corresponding to the surface Wa is appropriately selected.

The swinging direction of the grinding wheel 4 is set in accordance with the direction of the reaction of the inner surface of the work W acting on the grinding wheel 4 during honing.

More specifically, the swing center of the support arm 7, that is, the support shaft 11 is located outside the inner diameter surface Wa of the work W when viewed in the axial direction of the work W, and is located between the grindstone 4 and the inner diameter surface Wa. Is set and arranged on the upstream side in the direction of relative rotation of the workpiece W with respect to the grindstone 4 (see the arrow) with reference to the contact position O of.

As a result, the grinding wheel 4 swings along an arc trajectory indicated by a dashed line in FIG. 3, and the reaction force P of the inner surface Wa of the workpiece W generated during the honing process depends on the swinging direction of the grinding wheel 4. And a stable swinging of the grindstone 4, that is, a protruding / retracting operation can be obtained. Incidentally, the acting direction of the reaction force P in this case is determined by the resultant force of the cutting direction force by the grindstone 4 and the relative rotational force of the grindstone 4 and the work W, the shape of the inner diameter surface Wa, and the like.

The pressing cylinder device 8 presses the support arm 7 in the cutting direction of the grindstone 4, and specifically includes a pressing cylinder 20 using a fluid pressure such as air pressure or hydraulic pressure as a pressure medium. In the drawings, an air cylinder using air pressure is employed.

The pressing cylinder 20 is, as shown in FIG.
A pneumatic circuit (not shown) is provided at each side 10a of the rectangular contour of the mounting flange 10 of the head main body 5 corresponding to each support arm 7 and as a pressurized medium supply source provided in the apparatus main body. )It is connected to the.
In this case, the pressure of each pressing cylinder 20 is adjusted by providing a pressure adjusting valve common to all four pressing cylinders 20, 20,. Or each pressing cylinder 20
A dedicated pressure adjusting valve or the like is provided for each, and the pressure is adjusted independently by individual pressure adjusting means.

The pressing cylinder 20 has its cylinder body 2
0a is the mounting flange 1 by the mounting bracket 21.
0 is horizontally fixed toward the rotation center of the workpiece W, and its piston rod 20b is drivingly connected to the support arm 7.

The piston rod 20b and the support arm 7
As shown in FIG. 3, the connection structure is configured to reciprocate the support arm 7 via the operation arm 13.

More specifically, the distal end surface of the piston rod 20b has an arc-shaped cross section as shown in the figure, and this distal end surface can swing relative to the pressure receiving portion (pressing point) 13a of the operating arm 13. The support arm 7 is pressed in the cutting direction of the grindstone 4 by contacting and engaging in a state.

At the distal end of the piston rod 20b, a hook-shaped retreat engaging portion 22 having a substantially U-shape is attached. The piston rod 20b and the pressure receiving portion 13 of the operating arm 13.
a and the support arm 7
Can be pulled and engaged in the retreating direction of the grinding wheel 4.

Thus, by the projecting operation of the piston rod 20b of the pressing cylinder 20, the grindstone 4 of the support arm 7 is constantly urged in the cutting direction, that is, at a predetermined constant pressure against the inner surface Wa of the work W. (A cutting force is applied), and the reciprocating operation of the piston rod 20b causes the grindstone 4 to move in a retreating direction opposite to the cutting direction.

The constant pressure (pressing force) applied to the grinding wheel 4 in the cutting direction is determined by adjusting the set pressure of the pneumatic circuit as the pressurized medium supply source to the above-described single or individual pressure adjusting means. The shape and dimensions of the inner surface Wa of the target workpiece W, the shape and dimensions of the grindstone surface of the grindstone 4, the relative rotational speed and oscillation speed of these two, or the required finish dimensional accuracy of the inner surface Wa It is appropriately set in consideration of such factors.

In connection with this, the support arm 7
The distance dimension from the center of the support shaft 11, that is, the swing center to the tip grinding wheel surface (the Q point position) of the grinding wheel 4, that is, the support arm length L, and the piston rod 8 a of the pressing cylinder 8 from the swing center are The distance dimension of the connected pressure receiving portion 13a to the pressing action point R, that is, the ratio to the operating arm length 1 is
It is set according to the processing purpose.

In the illustrated embodiment, the length L of the support arm is set to be larger than the length l of the operating arm so that the grinding stone 4 faithfully follows the pre-processed shape of the inner surface Wa of the workpiece W without breaking. Have been. As a result, the sensitivity of the pressing cylinder 8 as pressing means is increased during honing, so that a constant cutting force by the pressing cylinder 20 is constantly and constantly applied to the grindstone 4,
Is synergistic with the swing configuration by the support arm 7,
A protruding / retracting operation that accurately corresponds to a change in the reaction force P of the inner diameter surface Wa caused by a change in the diameter of the inner diameter surface Wa of the work W is obtained, and good followability of the grindstone 4 with respect to the inner diameter surface Wa is secured.

The work holding section 2 holds and rotates the work W in correspondence with the head section 1. As shown in FIG. 1, a work holding body 26 is fixedly provided on a turntable 25. Become.

The turntable 25 has a rotating shaft 25a which is
7, and is supported by a device main body (not shown) so as to be horizontally rotatable, and is arranged coaxially with the head main body 5 of the head unit 1. The rotating shaft 25a includes a transmission pulley 28a, a transmission belt 28b, and a driving pulley 28c.
And a drive shaft 29a of a drive motor 29 as a rotary drive source.

The work holding body 26 has a holding portion 26a for detachably holding a lower outer peripheral portion of the work W. When the work W is held by the holding portion 26a, the inner diameter surface Wa of the work W The rotation table 25 is configured to be coaxial with the rotation center of the rotation table 25, that is, the rotation shaft 25a.

When the drive motor 29 is driven to rotate, the workpiece W is horizontally rotated coaxially with the center of the grindstones 4, 4,... .

The control unit 3 includes the drive motor 29, the elevating cylinder 9, the pressing cylinder 20, and the inner surface W of the workpiece W.
a for automatically controlling a driving source of an automatic sizing device (not shown) equipped with a sensor for detecting the shape and size of a.
It is composed of a microcomputer comprising U, ROM, RAM, I / O port and the like. The control unit 3 incorporates a control program and the like for executing a series of honing processing steps to be described later, and stores various individual control information necessary for driving each of the driving sources.
The data is appropriately input and set as C (numerical control) data in advance or by a keyboard or the like of an operation panel (not shown).

In the honing apparatus configured as described above, the honing head device 6 performs honing processing on the inner diameter surface Wa of the work W in accordance with the control program of the control unit 3 as described below.

The head body 5 of the head unit 1 is lowered by the protruding operation of the lifting / lowering cylinder 9, and the grindstone 4 of each support arm 7 is inserted into the inner diameter surface Wa of the work W and is opposed to the inner diameter surface Wa. And positioned.

The drive motor 29 is driven to rotate, the work W is rotated horizontally, and the lifting / lowering cylinder 9 is projected and retracted, so that the grindstone 4 of each support arm 7 is moved up and down with a preset stroke width. Reciprocate (oscillate).

In this state, the pressing cylinder 20 protrudes, and the support arms 7, 7,... Are pressed and oscillated in the cutting direction of the grindstone, whereby the grindstones 4, 4,.
Are abutted against the inner surface Wa of the work W with a predetermined constant pressure, and in this pressurized state, the grindstones 4, 4,... Perform honing processing on the inner surface Wa while following the inner surface Wa.

That is, the grindstones 4, 4,... Repeatedly rotate and reciprocate with respect to the workpiece W, and repeatedly project and retreat in the radial direction by swinging along the inner diameter surface Wa. While finishing, the inner diameter surface Wa of the work W is finished.

When this inner diameter surface Wa is machined to a predetermined inner diameter, this is detected by the automatic sizing device, and
When the pressing cylinder 20 retreats, the support arms 7, 7,.
Are pulled and swung in the retreating direction of the grindstones, the grindstones 4, 4,... Are separated from the inner surface Wa of the work W, and the elevating cylinder 9 retreats to move the grindstones 4, 4,. Return to the ascent. At the same time, the driving of the drive motor 29 is stopped, the rotation of the work W is stopped, and the replacement of the work W is performed automatically or manually by an automatic robot.

Thereafter, the following steps are repeated. The specific process operation in the above-mentioned processing step is appropriately designed according to the purpose. For example, the above-mentioned steps can be performed at the same time, or the order can be changed in the reverse order.

As described above, since the inner diameter surface Wa of the work W has a non-circular cross section, the grindstone 4 moves while following the inner diameter surface Wa, that is, the work of the inner diameter surface Wa of the work W. When honing is performed while repeatedly projecting and retracting according to the diameter change, the projecting and retracting operation of the grinding stone 4 is performed by swinging the support arm 7, and the swinging direction is as described above. Thus, the setting is made in accordance with the direction of action of the reaction force P on the inner diameter surface Wa of the workpiece W.

Therefore, the reaction force P of the inner diameter surface Wa effectively acts on the grindstone 4 and promotes the smooth swinging of the support arm 7, thereby protruding and retracting the grindstone 4 in the cutting direction. Is always stably obtained. As a result, even when the change in the diameter of the inner diameter surface Wa of the workpiece W is large as shown in the drawing, the grindstone 4 can accurately and smoothly follow the inner diameter surface Wa.

The pressing force of the pressing cylinder 20 assembled for each support arm 7 can be appropriately adjusted according to the processing conditions such as the shape and size of the inner surface Wa of the target work W. Regardless of the shape of Wa,
An optimal pressing force can be secured, and a uniform allowance can be secured over the entire circumference of the inner diameter surface Wa.

Embodiment 2 This embodiment is shown in FIG. 4, in which the operation configuration of the grindstones 4, 4,... Of the head unit 1 with respect to the work W is modified. Are fixedly supported, and the whetstones 4, 4,... Rotate and reciprocate (oscillate).

In the present embodiment, the head main body 5 of the head unit 1 is provided with a lift 30 provided on an unshown apparatus main body.
, Which are rotatably supported via bearings 31 and 32, and whose rotating shaft 33 is driven by a driving means serving as a rotation driving source via a transmission means 34 including a transmission pulley 34a, a transmission belt 34b and a driving pulley 34c. It is drivingly connected to a drive shaft 35a of the motor 35.

The drive motor 35 is provided vertically upward on the elevator 30 and is electrically connected to the controller 3. By the rotation of the drive motor 35, the grinding wheels 4, 4,... Of the head body 5 and the support arms 7, 7,.
Horizontally rotated about the same center as a.

Further, the lifting platform 30 is supported by the apparatus main body so as to be able to move up and down in the vertical direction, and is connected to the lifting cylinder 9 in the same manner as in the first embodiment. .. Oscillate in the axial direction of the inner surface Wa of the workpiece W.

In the honing apparatus configured as described above, the grindstone 4 of each support arm 7 is horizontally rotated by the rotation of the drive motor 35, and is vertically moved by the projecting and retracting operation of the lifting cylinder 9. Oscillation is performed to perform a predetermined honing process on the inner diameter surface Wa of the workpiece W fixedly supported by the workpiece holder 26 of the workpiece holder 2. Other configurations and operations are the same as those of the first embodiment.

Embodiment 3 This embodiment is shown in FIG. 5, and has a configuration applicable to the case where the external dimensions of a workpiece W to be machined are larger than its inner diameter surface Wa.

In this embodiment, the support arm 107 of the head portion 1 has a substantially L-shaped cross section, and the base end portion 107a has a substantially U-shaped cross section as compared with the support arm 7 of the first embodiment. And a thin shape. The support shaft 111 for supporting the base end 107a is also set to have a short dimension, so that the support structure of the support arm 107 is supported by the workpiece W held on the workpiece holder 26 of the workpiece holder 2. It is configured not to interfere with the structure.

In this connection, the outer peripheral portion of the mounting flange 110 of the head main body 5 supports the base end 107a of the support arm 107 from above and below, and also supports the support shaft 111 in a bilateral manner. It has a structure to do. This allows
The vertical state of the support shaft 111 and the horizontal state of the support arm 107 are maintained, and a reliable horizontal swing state of the support arm 107 is stably secured.

According to the above-described configuration, the present invention can be applied not only to the work W as shown in the figure, but also to honing of the inner diameter surface of a large and thin plate-shaped work. Other configurations and operations are the same as those of the first embodiment.

Embodiment 4 This embodiment is shown in FIGS. 6 and 7, and has a configuration applicable to the case where the non-roundness of the inner diameter surface Wa of the workpiece W to be machined is large.

That is, in this embodiment, the whetstone 4
A constant pressure holding means 200 for holding the processing pressure of the constant is provided, and the constant pressure holding means 200 is mainly composed of a diameter change detecting unit 201 and a fluid pressure adjusting unit 202.

The diameter change detecting unit 201 detects a change in the diameter of the inner surface Wa of the work W, and includes a cam 203 provided integrally with the work W and a position detection sensor 204 cooperating with the cam 203. Consists of The cam 203 is shown in FIG.
As shown in the figure, the disk is a substantially disk-shaped member integrally provided on the outer periphery of the work holder 26 on the turntable 25, and its outer peripheral surface 205 corresponds to the radial displacement of the inner diameter surface Wa of the work W. Cam surface.

The cam surface 205 is a substantially cylindrical surface concentric with the inner diameter surface Wa of the work W held by the work holding body 26, and more specifically, a reference surface concentric with the inner diameter surface Wa of the work W. A detection surface 205b corresponding to a particularly large inner diameter surface portion Wb of the inner diameter surface Wa is provided on a part of the cylindrical surface 205a.

The inner diameter surface portion Wb of the work W has a large diameter change gradient in which the grindstone 4 moves up and down (retreating operation) with respect to the rotation direction of the work W (the direction of the arrow in FIG. 7). Surface part, in other words, the inner diameter surface W of the workpiece W
This is a portion where the difference H in the retreat of the grindstone 4 with respect to the reference plane X of FIG.

On the other hand, the detection surface 205b of the cam surface 205 is provided at a rotational position synchronized with the inner diameter surface portion Wb of the work W, and its reference cylindrical surface 205b is provided.
There is a predetermined difference Ha with respect to a. This difference Ha
Is set in accordance with the above-mentioned difference H in consideration of the rotational speed given to the workpiece W.

The position detection sensor 204 is provided with the cam 203
Stylus 2 that slidably abuts and engages cam surface 205 of stylus 2
04a and the stylus 204a
Spring 204b that constantly resiliently biases against
And And the stylus 204a,
The reference cylindrical surface 205a of the cam surface 205 and the detection surface 205
When the movement corresponding to the difference Ha from the angle b is performed, the operation displacement is sent to the control unit 3 as a displacement signal (detection signal).

The fluid pressure adjusting unit 202 adjusts the fluid pressure, that is, the air pressure of the pressing cylinder device 8 in accordance with the detection result of the diameter change detecting unit 201, and is incorporated in the pneumatic circuit of the fluid pressure cylinder device 8. And a proportional control pressure reducing valve 210 as a main part.

The proportional control type pressure reducing valve 210 is, specifically, an electromagnetic type operated by a solenoid. The direction switching valve 211 for switching the air pressure flow path to the cylinder chamber of the pressing cylinder 20 and the pressing cylinder 20 are provided. It is interposed between.

The set pressure of the proportional control type pressure reducing valve 210 is continuously controlled in accordance with the control signal from the control section 3 in accordance with the detection signal of the position detection sensor 204, and the piston rod 20b of the pressing cylinder 20 is controlled. Is adjusted.

That is, when the grindstone 4 performs honing processing on the inner diameter surface Wa while following the inner diameter surface Wa of the work W having a non-circular cross section, the grindstone 4 is moved to the reference position of the inner diameter surface Wa of the work W. When it is on the surface, the pressing force of the piston rod 20b of the pressing cylinder 20 is maintained at the basic set value (basic selection pressure), while the grindstone 4
When the working pressure of the grindstone 4 is about to increase due to an increase in the reaction force P of the inner surface Wa of the workpiece W, the operation of the proportional control type pressure reducing valve 210
The pressing force of the piston rod 20b becomes lower than the basic set value.

Accordingly, the working pressure of the grindstone 4 is stably maintained at a predetermined value over the entire circumference of the workpiece inner diameter surface Wa, and the grindstone 4 projects and retreats due to the swing of the support arm 7. The operation is performed more smoothly, and as a result, even when the diameter of the inner diameter surface Wa of the workpiece W changes (the difference in the height H) or the rotation speed of the workpiece is particularly large, the good followability of the grindstone 4 with respect to the inner diameter surface Wa of the workpiece. Is secured, and the finished shape can be finished as it is without breaking the pre-processed shape of the inner surface Wa of the work W.

The apparatus according to this embodiment has a large non-roundness of the inner surface Wa of the workpiece W to be machined, and maintains the pre-machined shape of the inner surface Wa of the workpiece W as the finished shape as it is. It is preferably used. Other configurations and operations are the same as those of the first embodiment.

The above-described first to fourth embodiments merely show preferred embodiments of the present invention, and the present invention is not limited to these embodiments, and various design changes can be made within the scope thereof. For example, the following modifications are possible.

(1) The number of the support arms 7 provided with the grindstones 4 is not limited to the illustrated embodiment.
Is increased or decreased as appropriate in accordance with the maximum inner diameter dimension, the minimum inner diameter dimension, and the like of the inner diameter surface Wa.

(2) The operation configuration of the head unit 1 and the work holding unit 2 for the relative rotation and reciprocation of the grindstones 4, 4,... With respect to the work W is not limited to the illustrated embodiment. In contrast to the first embodiment, the head body 5 of the head unit 1 is driven to rotate, and the grindstones 4, 4,.
May be configured to reciprocate vertically, or, contrary to the third embodiment, a configuration in which the head body 5 of the head unit 1 is fixedly arranged and the work W rotates and reciprocates. is there.

(3) The pressing cylinder 2 of the pressing cylinder device 8
As 0, other than the air cylinder shown in the drawing, a cylinder using other fluid pressure such as a hydraulic cylinder using hydraulic pressure can be adopted. Further, the pressing cylinder device 8
Instead of other devices that perform similar actions, such as racks
Reciprocating drive means including a pinion mechanism and a rotary drive motor can also be employed.

(4) Similarly to the pressing cylinder 20, the lifting cylinder 9 may be replaced with a cylinder using another fluid pressure, or a ball screw mechanism and a rotation driving motor, or a rack and pinion mechanism and a rotation driving motor may be used. It is also possible to substitute a device that performs other similar functions such as a reciprocating drive unit composed of the above.

(5) In the illustrated embodiment, the work W
The length L of the support arm is set to be longer than the length l of the operating arm for the purpose of maintaining the pre-processed shape of the inner surface Wa of the workpiece W as a finished shape. In the case where importance is attached to a large processing amount, that is, processing efficiency, rather than maintenance of the above, it is desirable to set the support arm length L to be smaller than the operation arm length l, contrary to the illustrated one. .

(6) In the illustrated embodiment, the support arm 7 is reciprocally oscillated by the pressing cylinder 20. In addition, the pressing cylinder 20 is pressed in the grinding wheel cutting direction of the support arm 7. It is also possible to adopt a configuration in which an operating spring or the like for urging the support arm 7 in the grinding wheel retreating direction is provided in addition to dedicated means.

(7) In the illustrated embodiment, each component device is configured to be driven fully automatically by the automatic control by the NC. However, the present invention is not limited to this, and includes a part of manual operation. It goes without saying that a drive configuration according to the purpose, such as semi-automatic, can be adopted.

[0091]

As described above in detail, according to the honing head device of the present invention, the support arm is supported so as to be swingable in a direction perpendicular to the axis of the inner diameter surface of the work, and the tip of the support arm is provided. Since the direction of swing of the grinding wheel is set according to the direction of reaction of the reaction force of the inner diameter surface of the workpiece acting on the grinding wheel during honing, the swing of the support arm is smooth. By the movement, the whetstone
Honing is performed faithfully following the inner diameter surface of the work having a non-circular cross section, that is, the non-circular inner surface. As a result, regardless of the size of the diameter change of the inner surface of the workpiece,
Good followability of the grindstone to the inner diameter surface of the work is ensured, and high-accuracy honing can be realized.

According to the honing apparatus of the present invention including the honing head apparatus, the support arm is pressed and oscillated in the cutting direction of the grindstone by the pressing means, and the grindstone at the tip thereof is fixed to the inner diameter surface of the work by a predetermined constant. Since the grinding wheel performs honing on the inner surface of the work while rotating and reciprocating relative to the work while being abutted with pressure, high-precision honing for forming a cross hatch pattern is performed. be able to.

Further, by appropriately adjusting the pressing force of the pressing means assembled for each of the support arms according to the processing conditions such as the shape and size of the inner diameter surface of the target work,
Irrespective of the shape of the inner diameter surface, a uniform allowance can be secured over the entire circumference, and from this point, a highly accurate honing process can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a main part of a non-circular inner surface honing device according to a first embodiment of the present invention in a partial cross section.

FIG. 2 is a configuration diagram showing a honing head device, which is a main part of the honing device, from below along a line II-II in FIG. 1;

FIG. 3 is an enlarged configuration diagram showing a main part of the honing head device in a partial cross section.

FIG. 4 is a schematic configuration diagram corresponding to FIG. 1 and showing a main part of a non-circular inner surface honing device according to a second embodiment of the present invention in a partial cross section.

FIG. 5 is a schematic configuration diagram corresponding to FIG. 1, showing a main part of a honing device for a non-circular inner surface according to a third embodiment of the present invention in a partial cross section.

FIG. 6 is a schematic configuration diagram corresponding to FIG. 1 showing a main part of a non-round inner surface honing device according to a fourth embodiment of the present invention in a partial cross section.

FIG. 7 is a schematic configuration diagram showing an enlarged main part of a honing head device of the honing device.

8 (a) is a plan view showing a partial cross section of the honing head, and FIG. 8 (b) is a VIII of the honing head of FIG. 8 (a). -V
FIG. 3 is a sectional view taken along line III.

[Explanation of symbols]

W Work Wa Wa Work Inner Diameter Surface Wb Particularly Large Diameter Change in Diameter on Work Inner Surface L Support Arm Length l Working Arm Length 1 Head 2 Work Holder 4 Grinding Stone 5 Head Body 6 Honing Head Device 7 Support Arm Reference Signs List 8 pressing cylinder device 9 elevating cylinder 11 support arm support shaft 12 bearing 13 operating arm 13a pressure receiving part (pressing action point) 15 grinding wheel holder 20 pressing cylinder 20b piston rod of pressing cylinder 22 retraction engaging part of pressing cylinder 25 work holding part Rotary table 26 Work holder of work holding part 28 Transmission means 29 Motor 30 Elevating table 34 Transmission means 35 Motor 107 Support arm 111 Support arm support shaft 200 Constant pressure holding means 201 Diameter change detection unit 202 Fluid pressure adjustment unit 203 Cam 204 205 position detection sensors Surface 210 proportionally controlled pressure reduction valve

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B24B 33/06-33/08 B24B 33/02

Claims (11)

(57) [Claims] 1. A honing device for honing a non-circular inner surface of a workpiece, wherein the support arm is supported so as to be swingable in a direction perpendicular to an axis of the inner surface of the workpiece. A grindstone is attached to the tip of the support arm, and the swinging direction of the grindstone is set to correspond to the direction of reaction of the reaction force of the inner diameter surface of the workpiece acting on the grindstone during honing processing. Features Honing head device for non-circular inner surface. 2. The center of swing of the support arm is, when viewed in the axial direction of the workpiece, outside the inner diameter surface of the workpiece and based on a contact position between the grinding wheel and the inner diameter surface of the workpiece as a reference. 2. The honing head device for a non-circular inner surface according to claim 1, wherein the honing head device is set on the upstream side in the direction of relative rotation with respect to. 3. The grindstone at the tip of the support arm is disposed radially outward of the inner diameter surface of the workpiece when viewed in the axial direction of the workpiece, and extends in parallel with the axis of the inner diameter surface of the workpiece. The honing head device for a non-circular inner surface according to claim 1 or 2, further comprising a whetstone surface having a convex arc shape. 4. The non-circular inner surface according to claim 1, wherein a plurality of support arms provided with the grindstones are arranged in a circumferential direction of a workpiece inner diameter surface. Honing head device. 5. An apparatus for honing a non-circular inner surface of a workpiece with a grindstone that performs relative rotation and reciprocating motion with respect to the workpiece, and wherein the honing is performed on the inner surface of the workpiece. A honing device comprising: a head portion having a honing head device; and a work holding portion for holding a workpiece. 6. A head arm provided with the grindstone on a head main body arranged coaxially with an inner diameter surface of a workpiece held by the work holding portion, and the support arm is moved in a cutting direction of the grindstone. The honing device according to claim 5, further comprising a pressing means for pressing. 7. The pressure means is in the form of a hydraulic cylinder device using a fluid pressure as a pressurized medium, and the support arm is supported by the head body via a bearing so as to be freely rotatable. The ratio between the distance dimension from the swing center of the support arm to the tip grinding wheel surface of the grindstone and the distance dimension from the swing center to the pressing action point of the piston rod of the fluid pressure cylinder device corresponds to the processing purpose. The honing device according to claim 6, wherein the honing device is set. 8. The honing apparatus according to claim 7, further comprising a constant-pressure holding means for holding a processing pressure of the whetstone constant. 9. A constant-pressure holding means for detecting a diameter change of a workpiece inner diameter surface, and adjusting a fluid pressure of the fluid pressure cylinder device according to a detection result of the diameter change detector. The honing device according to claim 8, further comprising a fluid pressure adjusting unit. 10. A cam having a cam surface which is provided integrally with a workpiece and has a cam surface corresponding to a radial displacement of an inner diameter surface of the workpiece, and slidable on the cam surface of the cam. And a position detection sensor for detecting a radial displacement of a position of the inner diameter surface of the workpiece relative to the grindstone in a rotational direction, wherein the fluid pressure adjusting unit includes a fluid pressure of the fluid pressure cylinder device. The honing apparatus according to claim 9, further comprising a proportional control type pressure reducing valve incorporated in a circuit and controlled according to a detection result of the position detection sensor. 11. The apparatus according to claim 5, wherein the work holding unit and the head unit are configured such that the grindstone rotates relative to the workpiece and performs a reciprocating motion. The honing device according to any one of the above.