JPS62166935A - Support device for rotary tool - Google Patents

Abstract

PURPOSE:To make it possible to firmly locate a rotary tool in such a condition that the tool is deviated from a spindle, by coupling the rotary tool deviatably to the spindle, and by pressing a guide member by means of the side surface of a lock member which is adapted to be deformed into a bulged shape under action of pressure fluid. CONSTITUTION:After machining of a valve guide 140 with the use of a reamer 100. Pressure fluid is fed from pipe lines 84a-84d into a lock member 40 at a position where a cutting tool 98 is set in the vicinity of a valve seat 142. The pressure fluid is introduced into a second chamber 46 from a first chamber 44 through holes 42a-42d in the lock member 40, and therefore a thin wall section 50 formed between the second chamber 46 and a side surface section 48 is pressed by the pressure fluid so that it is deformed in a bulged shape. Accordingly, a guide member 52 is pressed by means of the side surface 48 of the lock member 40, and therefore, the guide member 52 is firmly pressed and held by the inner surface of a cover member 74 and the side surface section 48 of the lock member 40.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a rotating tool, and more particularly, the present invention relates to a supporting device for a rotating tool, and more particularly, a device for supporting a rotating tool in a state where the rotating tool is connected to the main shaft of a drive part, and the axis of the rotating tool is deviated from the axis of the main shaft. The present invention relates to a support device for a rotary tool, which enables secure positioning and fixation of the tool and makes the device itself as compact as possible.

Generally, in an internal combustion engine, an in-left valve that is displaceably mounted on a cylinder head and that takes in combustion gas, and an outlet valve that exhausts combustion gas must be seated accurately relative to a valve seat. For example, if a gap is formed in the contact surface between the inleft valve or outlet valve and the valve seat, causing pressure leakage, gas leakage will occur during the compression and expansion strokes within the internal combustion engine, reducing combustion efficiency. There is a risk that sufficient driving force may not be obtained. Therefore, the valve seat itself is machined with high precision so that the valve accurately engages with the valve seat, and the valve guide that fits and guides the valve and the valve seat are coaxially precision processed ( It needs to be processed.

Conventionally, when processing the valve seat and valve guide, the valve guide and valve seat surface are integrally processed with the valve guide mounted directly on the cylinder head. The work of placing the cylinder head on the jig table is extremely complicated.

That is, each cylinder head is molded within a predetermined error range, but since a relatively long valve guide is attached to the cylinder head, the axis of the valve guide and the axis of the cutting tool must be aligned. This is actually quite difficult. As a result, a large amount of time is required to position the cylinder head, resulting in a significant drop in work efficiency and the disadvantage that it is impossible to meet the demands of mass production.

Therefore, in view of the above-mentioned drawbacks, the present applicant proposed various devices for the purpose of facilitating the processing of valve seats and valve guides. A patent application was filed on April 7th (Tokukō Sho 5).
No. 9-11402).

The device employs the following configuration.

That is, a tool holder is equipped with a gluer for processing the valve guide and a cutter for processing the valve seat, and the tool holder is connected to the main shaft of the drive section via a universal joint. Furthermore, this tool holder is fitted and held within a support cylinder, and the support cylinder is provided with three or more support pins that can move forward and backward in the radial direction. On the other hand, the support tube is fitted and attached to the center of a support plate suspended by a guide bar protruding from the drive unit main body toward the workpiece.

In such a configuration, when the main shaft is rotated and the drive body is moved close to the workpiece, that is, the cylinder head, the reamer provided on the rotary tool processes the valve guide attached to the cylinder head. In the first case,
Since the rotary tool is connected to the main shaft via a universal joint, its rotation center line can be displaced from the axis of the main shaft along the axis of the valve guide. Then, after machining the valve guide with the reamer, when the cutter approaches the valve seat surface, the support pin provided in the support cylinder is displaced radially inward to position and fix the rotary tool. Next, when the valve seat is machined using the cutter, the valve seat is precisely machined coaxially with the valve guide. Therefore, there is no need to position the cylinder head very precisely.
Advantages such as being able to achieve efficient machining operations have been obtained.

The present invention has been made regarding this type of support device, in which a rotating tool is supported in a casing by a holding member via a spherical bearing, and the rotating tool is supported at a position where the axis of the rotating tool is deviated from the axis of the main shaft. By fixing the holding member in the casing via a locking member that can be expanded and deformed by pressure fluid, the rotary tool can be accurately and firmly positioned at a predetermined angular position, and moreover, An object of the present invention is to provide a support device for a rotary tool that allows the entire device to be made as compact as possible in order to hold the rotary tool.

In order to achieve the above object, the present invention includes a casing fixed to a main body of a drive unit, and a rotary tool that is attached to a main shaft of the drive unit and whose center of rotation can be displaced with respect to the axis of the main shaft. a bearing member that holds the rotary tool and has a spherical outer circumferential portion; a guide member that has a spherical inner circumferential portion corresponding to the spherical outer circumferential portion and is displaceable in a radial direction within the casing; It is characterized by including a locking member that presses and fixes the guide member to the casing.

Next, preferred embodiments of the rotary tool support device according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3, reference numeral 10 indicates a support device for a rotary tool according to the present invention, and in this case, the support device 10 is attached to a drive body 12. As shown in FIG.

To the spindle/nod 14 that constitutes the drive unit main body 12
A spindle 16 is rotatably supported therein. A large diameter portion 18 is formed at the tip of the spindle 16 via a stepped portion, and a hole 20 is bored in the center of the large diameter portion 18 in the axial direction. Threaded holes 19a to 19c are formed along the axis of the peripheral wall defining the hole 20 and equally spaced radially outward from the center of the hole 20. and,
A chuck member 22 is engaged with the large diameter portion 18 . A hole 24 is formed through the center of the chuck member 22, and a thin cylindrical chamber 2 is formed to surround the hole 24.
6, and this chamber 26 is connected to a pressure fluid supply source (not shown). In this case, the large-diameter flange portion 23 formed at one end of the chuck member 22 is provided with holes 25a to 25c in the axial direction.
Bolts 27a to 27c are inserted into bolts 5a to 25c, and their tips are screwed into the screw holes 19a to 19C to securely fix the chuck member 22 to the large diameter portion 18.

On the other hand, a mounting member 28 is fixed to the spindle head 14, and a cylindrical casing 30 constituting the support device 10 is attached to the mounting member 28 via bolts (not shown). A hole 32 is formed in the center of the casing 30, oriented in the axial direction, and a hole 34 having a smaller diameter communicates with the end of the hole 32 via a step. Further, three boats 36 are formed at one end of the outer circumference of the casing 30 and are oriented in the radial direction and communicate with the hole 32. Boats 38a to 38a are spaced apart from the boats 36 by a predetermined distance and communicate with the hole 32. 38d is formed.

A locking member 40 is disposed in the hole 32 of the casing 30, and the locking member 40 is fixed to the casing 30 via a tightening bolt 1-41 that is screwed in from an oblique direction (second
(see figure). The locking member 40 has a cylindrical shape, and holes 42a to 42d corresponding to the boats 38a to 38d of the casing 30 are formed in the outer peripheral surface thereof. Hole 42
Ends a to 42d communicate with a cylindrical first chamber 44 extending in the axial direction of the locking member 40, and ends of the first chamber 44 communicate with a cylindrical first chamber 44 extending in the radial direction of the locking member 40. It communicates with the second chamber 46. In this case, a thin portion 50 is formed between the wall portion defining the second chamber 46 and one side portion 48 of the locking member 40 .

Furthermore, a disc-shaped guide member 52 is disposed in the hole 32 of the casing 30 in contact with the side surface 48 of the lock member 40 . The diameter of the guide member 52 is the same as that of the casing 3.
A spherical part 54 is formed in the center of the guide member 52 and is curved outward in the radial direction, and a circumferential groove 56 is formed in the spherical part 54. engraved. Then, a circular plate portion 58 having a predetermined width is formed by cutting both side surfaces of the guide member 52 into a circular shape, and a hole portion 60 is bored in the disk portion 58 oriented in the axial direction. In this case, the diameter of the hole 60 is selected to be larger than the diameter of the engagement pin described below.

On the other hand, there are three passages 62 on the outer peripheral surface of the guide member 52.
, and one end of the passage 62 is connected to the circumferential groove 56 of the spherical portion 54.
The other end of each passage 62 communicates with the boat 36 of the casing 30.

Here, a fluid bearing 64 is supported by the guide member 52. A guide member 5 is provided on the outer periphery of the fluid bearing 64.
A spherical portion 66 corresponding to the second spherical portion 54 is formed.

A hole 68 is formed in the center of the fluid bearing 64, oriented in the axial direction, and a circumferential groove 70 having a predetermined width communicates with the middle of the hole 68, and the circumferential groove 70 has a spherical surface. The hole 72 formed in the portion 66 communicates with the hole 72 .

A lid 74 is fixed to the tip of the casing 30.

A hole 76 having a smaller diameter than the guide member 52 is formed in the center of the lid 74, and a hole 76 corresponding to the hole 60 of the guide member 52 and having a smaller diameter is formed in one side of the lid 74. A hole 78 is formed. One end of an engagement pin 80 is fitted into the hole 78, and the other end of the engagement pin 80 is loosely fitted into the hole 60 of the guide member 52. Therefore, although the guide member 52 can be displaced in the radial direction, it is prevented from rotating.

Note that one end of a conduit 82 is connected to the port 36 of the casing 30, and the other end of the conduit 82 is connected to an air supply source (not shown). On the other hand, one ends of pipes 84a to 84d are connected to the ports 38a to 38d, respectively, and the pipes 84
The i ends of a to 84d are connected to a fluid supply source (not shown).

In such a configuration, the rotary tool 92 is held by the chuck member 22 and the fluid bearing 64. An escape groove 96 is formed in the outer peripheral portion of the holder portion 94 constituting the rotary tool 92, and a cutting tool 98 for processing the valve seat is fixed thereto. Furthermore, a reamer 100 for valve guide processing is fixed to the tip of the holder portion 94. On the other hand, a flange-like large diameter part 95 is formed at the rear end of the holder part 94, and the large diameter part 95
Bolt insertion holes 97a to 97c are bored in the axial direction.

A small-diameter tapered portion 99 is formed protruding from one end of the large-diameter portion 95 . This is because centering can be performed appropriately.

Then, this holder part 94 is attached to the bolts 101a to 101.
It is attached to the cylindrical body 102 via c.

A hole 104 is bored in the center of the cylindrical body 102, and a screw hole 106 and a hole 108 are formed at a predetermined distance from the hole 104.
to form. In this case, an inclined hole 105 corresponding to the tapered portion 99 is formed in the center of the cylindrical body 102, and holes 97a to 97c are formed on one side of the cylindrical body 102 provided with the inclined hole 105. Corresponding screw hole 107
Mark a to 107c.

Then, the tapered part 99 is fitted into the inclined hole part 105, the bolts 101a to 101c are inserted into the holes 97a to 97c, and the respective tips are screwed into the screw holes 107a to 107c, so that the holder part 94 is cylindrical. It is attached to the body 102. In this case, the holder portion 94 is positioned coaxially with respect to the cylindrical body 102 via the tapered portion 99. On the other hand, a screw hole 110 communicating with the hole 104 is formed at one end edge of the outer circumference of the cylindrical body 102 , and a set screw 112 is screwed into the screw hole 110 so that its tip fits into the hole 104 . It engages with a coupling 114 having elasticity. A hole 116 is formed in the center of the coupling 114, oriented in the axial direction, and a small diameter hole 118 is communicated with the end of the hole 116 via a step. Then, a screw hole 120 that communicates with the hole 118 is formed in the outer peripheral part of the camp ring 114, and this screw hole 120
Screw the set screw 122 into the screw 0.

A rod member 124 is engaged with the cylindrical body 102.

The rond part 126 constituting the rod member 124 is formed with a small diameter and a relatively long axis, and a large-diameter threaded part 128 is provided at one end of the rond part 126 to be screwed into the screw hole 106 of the cylindrical body 102. A cylindrical portion 130 that fits into the hole 108 is formed at one end of the threaded portion 128 . For example, a hexagonal wrench fitting hole 131 is bored in the center of the cylindrical portion 130 .

At the other end of the rod member 124, a cylindrical portion 132 that fits into the hole 118 of the force/knob ring 114 and a tapered portion 134 are integrally formed, and a threaded portion 136 is provided at the end of the tapered portion 134. .

Furthermore, the rotating shaft 150 is engaged with the rod member 124.

An inclined hole part 152 corresponding to the tapered part 134 is formed in the center of the rotating shaft 150, and a screw hole 154 is communicated with the end part of the inclined hole part 152. Threaded portion 136 in screw hole 154
At the same time, the rotary shaft 150 is screwed into the rod member 124 through the tapered portion 134.
The axis of the rotating shaft 150 is made to coincide with the axis of the rotating shaft 150. in this case,
If a hex wrench is fitted into the hole 131 of the cylindrical part 130,
The rod member 124 and the rotating shaft 150 can be easily attached and detached.

The rotary tool support device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, when pressurized air is supplied from an air supply source (not shown) to the chamber 26 of the chuck member 22, the thin portion formed between the chamber 26 and the hole 24 bulges and deforms toward the rotating shaft 150, and this rotation A shaft 150 is firmly fixed to the chuck member 22. On the other hand, when a predetermined pressure air is supplied into the passage 62 of the guide member 52 from an air supply source (not shown) via the pipe line 82, the pressure air is supplied to the hole 72 of the fluid bearing 64.
It is led out to the circumferential groove 70 via. Therefore, the cylinder 102
The fluid bearing 64 has its peripheral surface pressed by the pressure fluid.
It is rotatably supported.

Next, when the spindle 16 constituting the drive unit main body 12 is rotated under the action of a rotational drive source (not shown), the rotation shaft 150 held by the chuck member 22 attached to the tip of the spindle 16 rotates, and the rotation shaft 150 is rotated. The rod member 124, which is attached to the rotating shaft 150, rotates. Furthermore, the cylindrical body 102 screwed onto the rod member 124 rotates,
The reamer 100 and the hide 98 are rotated via the holder part 94 fixed to the tip of the cylindrical body 102.

In this way, when the rotary tool 92 is rotated and moved close to the drive body 12 and the workpiece, for example, the cylinder head 138 side, the valve guide 140 attached to the cylinder head 138 is processed by the reamer 100. . At that time, the axis (2) of the valve guide 140 is often offset from the axis (S) of the spindle 16 (
(See Figure 3). Therefore, when the valve guide 140 is machined by the reamer 100, the reamer 100 tends to follow the axis V of the valve guide 140 and deviate from the axis S of the spindle 16.

Here, in this embodiment, the rod portion 126 of the rod member 124 that is engaged with the rotating shaft 86 is formed to have a small diameter and be relatively long, and the tip portion of the rod portion 126 has a large diameter screw portion 12B and a cylindrical portion. 130, the rod member 124 is easily bent about the tapered portion 134 as a fulcrum.

Further, a coupling 114 is provided so as to surround this opening/) door member 124, and as a result, the rotary tool 92
It becomes possible to deviate the center line of rotation with respect to the axis S of the spindle 16 while being held by the chuck member 22. Therefore, when the reamer 100 is displaced along the axis V of the valve guide 140, for example in the direction indicated by the arrow in the figure, the guide member 52 holding the rotary tool 92 via the fluid bearing 64 similarly Displaced in the incoming direction. Therefore, the fluid bearing 64 is deflected so as to rotate while holding the cylindrical body 102 with its spherical portion 66 engaged with the spherical portion 54 of the guide member 52. As a result, the rotary tool 92 can suitably deviate its rotation center line.

In this way, the valve guide 14 is
After processing 0, the hide 98 is attached to the valve seat 142.
Pressure fluid such as oil is supplied into the locking member 40 from the pipes 84a to 84d at a position close to the locking member 40. The pressure fluid is concentrated from the first chamber 44 to the second chamber 46 through the holes 42a to 42d of the locking member 40, and the thin wall portion 50 formed between the second chamber 46 and the side surface 48 It is pressed by the pressure fluid and bulges and deforms in the direction of arrow B (see Fig. 3). Therefore, the guide member 52 is pressed in the direction of arrow B via the side surface 48 of the lock member 40, and as a result, this guide
The door member 52 is firmly pressed and held by the inner surface of the lid 74 and the side surface 48 of the lock member 40.

Since the rotary tool 92 is firmly held by the lock member 40, when the valve seat 142 is machined by the hide 98 provided in the holder portion 94, the rotary tool 92 is not deflected due to cutting resistance, and the valve seat 92 is not deviated due to cutting resistance. Sheet 142 is precisely machined. Furthermore, since the rotary tool 92 is positioned coaxially with the axis line (2) of the valve guide 140 via the reamer 100, the valve seat 142 processed by the cutting tool 98 can be processed coaxially with the valve guide 140 with high precision. leading to. At this time, it goes without saying that cutting debris generated from the valve seat 142 is suitably led out to the outside via the escape groove 96.

After completing the machining of the valve guide 140 and valve seats 1-142, the drive body 12 is moved away from the cylinder head 138 while rotating the spindle 16, and the machined cylinder head 138 and the new unmachined cylinder head are separated. Replace with 138. On the other hand, the support device 10
In this case, the locking member 40 is removed from the pipes 84a to 84d.
The supply of pressure fluid that was being supplied to the inside of the thin wall portion 50 is stopped, and the thin wall portion 50
By returning the guide member 52 to the state shown in FIG.
can be displaced in the radial direction within the casing 30.

Therefore, a new cylinder head 13 is created by the process described above.
8 may be processed using this rotary tool 92. Note that when exchanging the reamer 100 and the cutting tool 98 with another reamer 100 and the cutting tool 98, first, remove the holes 101a to 101 that fix the holder portion 94 to the cylindrical body 102.
c to remove this holder part 94. Next, a new holder portion 94 may be fixed to the cylindrical body 102 via the bolts 101a to 101c.

As described above, according to the present invention, a rotary tool is connected to the main shaft of the drive unit body so as to be deflectable, the rotary tool is held by a guide member via a spherical bearing, and when positioning the rotary tool, The guide member is fixed by being pressed by the side surface of the lock member which expands and deforms under the action of pressure fluid. Therefore, it is possible to firmly position the rotary tool in a state where it is deviated from the main shaft. Therefore, for example, the valve guide and the valve seat can be coaxially and extremely accurately machined, and this has the advantage that it can be easily applied especially when machining workpieces for mass production. Moreover, the locking member is provided inside the casing that constitutes the support device, which has the effect of downsizing the support device itself and making it possible to efficiently utilize the narrow space in the workplace. It will be done.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

Fig. 1 is a partially omitted exploded perspective view of a support device for a rotary tool according to the present invention, Fig. 2 is a partially omitted vertical sectional view of the support device of the present invention, and Fig. 3 is a rotary tool attached to the support device of the present invention. FIG. 2 is a partially omitted vertical cross-sectional view when processing a workpiece. IO... Support device 12... Drive unit main body 1
4...Spindle head 16...Spindle 22
...Chuck member 30...Casing 40.
...Lock member 50...Thin wall portion 52-...
Guide member 54... Spherical part 64... Fluid bearing 66... Spherical part 74... Lid body
80... Engaging pin 92... Rotating tool
94...Holder part 98...Hide
100...Reamer 102...Cylindrical body 1
14... Coupling 124... Rond member
138... Cylinder head 140... Valve guide 142... Valve seat 150... Rotating shaft

Claims (3)

[Claims] (1) A casing fixed to a drive unit main body, a rotary tool that is attached to the main shaft of the drive unit and whose center of rotation can be displaced with respect to the axis of the main shaft, and a rotary tool that holds the rotary tool and a bearing member provided with a spherical outer circumferential portion; a guide member forming a spherical inner circumferential portion corresponding to the spherical outer circumferential portion and movable in a radial direction within a casing; and pressing and fixing the guide member to the casing. A support device for a rotary tool, comprising a locking member. (2) In the support device according to claim 1,
A fluid chamber is formed inside a cylindrical locking member, a thin wall portion is provided between one side of the locking member and a wall defining the chamber, and the locking member is housed in a casing to provide this lock. A guide member is arranged on the thin wall side of the member,
A support device for a rotary tool, in which the guide member is clamped and fixed between one side of a lock member and a casing by introducing pressure fluid into the chamber to bulge and deform the thin wall portion. (3) In the support device according to claim 1,
The rotary tool includes a holder portion provided with a cutting tool and a rod body having one end engaged with the holder portion and the other end being engaged with the main shaft, the other end of the rod being engaged with the main shaft serving as a fulcrum. A support device for a rotary tool, wherein the rotation center of the cutting tool can be displaced with respect to the axis of the main shaft by bending the cutting tool.