JP2000153403A - Both-end work mahine and manufacture of extension member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a both-end work machine capable of freely molding an eccentric shape in accordance with use also easily constituting an eccentric mechanism without causing complication of a structure and enlargement in size. SOLUTION: In this work machine, a cylindrical main spindle 11 is rotatably mounted through a bearing in an inner side of a head stock 10. A cylindrical sub-spindle 12 is fixed by a bolt 13 inserted through an end part to an inner side of the main spindle 11. A chuck part including a collet 17 in the vicinity of a right/left opening part of the sub-spindle 12 is fixedly mounted in its inner side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-end processing machine and a method of manufacturing an extension member, and more particularly to a structure of a double-end processing machine suitable for processing both ends of a work such as a pipe and a shaft, and manufacturing of an extension member. About the method.

[0002]

2. Description of the Related Art Conventionally, as a double-end processing machine for processing both ends of a work such as a pipe and a shaft, a cylindrical main spindle and a chuck section composed of a collet chuck inserted and fixed inside the main spindle are known. Some have been provided. In this double-end processing machine, the work is inserted with the chuck part released, and both ends of the work are made to protrude outside the both ends of the spindle. When the spindle is rotated in this state, the work rotates together with the chuck part. Therefore, both ends of the work can be cut by tools disposed outside both ends of the main shaft.

[0003]

However, in the above-mentioned conventional double-end processing machine, the work is performed by rotating the main shaft while the work is held coaxially with the main shaft by the chuck portion. There is a problem that it is not possible to form a deformed shape. For this reason, conventionally, another eccentric component formed in advance by die casting, resin molding, or the like has been joined to both ends of the shaft by a method such as press fitting or bonding.

Further, in the case of a double-end processing machine having a pair of chucks near both ends of a main spindle, if the chucks are to be eccentric, it is necessary to form a special chuck structure capable of gripping the work in an eccentric state. In addition, since it is necessary to arrange a large movable part for opening and closing the chuck structure outside the spindle end, it is difficult to design and arrange the machine and to increase the size of the machine. There is a problem that providing the mechanism itself is difficult.
For this reason, a method is considered in which one end of the work is gripped by the chuck portion and the other end is supported in a sliding bearing shape by a guide bush. In this case, the number of revolutions during processing should be sufficiently increased. There is a drawback that you can not. Furthermore, since the structure is complicated as described above, there is a problem that it is difficult to adjust the amount of eccentricity.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a double-end processing machine capable of freely forming an eccentric shape according to a use.
Still another object of the present invention is to realize a structure of a double-sided processing machine in which an eccentric mechanism can be easily configured and does not cause a complicated structure or an increase in size.

[0006]

Means taken by the present invention to solve the above-mentioned problems are that a main spindle rotatably supported as a rotatable main spindle and a main spindle that is rotatably driven are detachably attached to the main spindle. And a sub-spindle fixed to the sub-spindle, and a chuck portion for gripping the work is fixed in a state of being supported in contact with the sub-spindle. According to this means, the sub-spindle is attached and fixed to the main spindle that is driven to rotate, and the chuck portion is supported in contact with the sub-spindle. By appropriately setting the shape of the workpiece, it becomes possible to appropriately fix the work held by the chuck portion at a position deviated from the axis of the main spindle, so that an arbitrary shape such as an eccentric shape can be easily processed. Will be able to do it.
In addition, the amount of rotation can be sufficiently increased because no sliding bearing is used, and the amount of eccentricity can be adjusted simply by replacing the sub-spindle, so that the adjusting operation can be easily performed. . Here, the chuck portion only needs to be supported in contact with the sub-spindle, and in addition to directly attaching and fixing the chuck portion to the sub-spindle, in order to fix the chuck portion in a state in which it is supported in contact with the sub-spindle. Alternatively, the chuck portion may be attached and fixed to the main spindle or another member. It is preferable that the sub-spindle is fixed to the end of the main spindle in the axial direction because the structure can be simplified particularly.

Preferably, the sub-spindle is inserted and fixed in an inner space of the main spindle, and the chuck portion is preferably inserted and arranged in an inner space of the sub-spindle. By inserting and fixing the sub-spindle in the inner space of the main spindle and inserting and arranging the chuck portion in the inner space of the sub-spindle, the main shaft can have a simple structure and can be downsized. In this case, it is particularly desirable that both the main spindle and the sub-spindle are formed in a cylindrical shape.

In the first or second aspect, the support surface of the sub-spindle with respect to the chuck member is configured to be eccentric with respect to the axis of the main shaft, so that the workpiece held by the chuck portion is offset. It can be processed into a core shape.

In any one of the first to third aspects, the chuck portions are respectively disposed near both ends of the main shaft, and the sub-spindle is configured to support a pair of the chuck portions together. Is desirable. As a double-end processing machine, there is a case where one end of a work is gripped and fixed by a chuck portion, and the other end of the work is held by an insertion portion such as a guide bush. Since both end portions can be gripped and fixed by the pair of chuck portions, the workpiece can be positioned and processed more accurately.

According to a fourth aspect of the present invention, there is provided a stress applying mechanism disposed between the pair of chucks in the internal space of the main shaft and applying a stress for causing the chucks to grip the work, An interlocking member connected to an application mechanism and drawn out of both ends of the main shaft from the internal space, wherein the opening / closing state of the chuck portion can be operated by moving the interlocking member. desirable. The stress applying mechanism acts to grip the workpiece by the stress applying mechanism, and the open / close state of the chuck is operable by an interlocking member pulled out, so that the stress applying mechanism can be installed in the internal space of the spindle. Even if it is arranged, the chuck portion can be easily controlled by operating the interlocking member, so that the structure of the entire apparatus can be simplified, the spindle can be downsized, and the drive system can be simplified. In these cases, the stress applying mechanism includes an elastic member for the chuck portion to apply a gripping force to the work, and moves the interlocking member so that the chuck portion resists the elastic force of the elastic member. Is preferably released from the work. In this case, it is preferable that the elastic force is applied in the axial direction of the main shaft, and the interlocking member is configured to move in the axial direction. When the interlocking member and the stress applying mechanism are provided as described above, the interlocking member is engaged with the outer end portion pulled out of the main shaft and the chuck portion in the rotation direction. It is desirable to have an engaging portion and an inner end connected to the stress applying mechanism.

[0011] In any one of the first to fifth aspects, it is preferable that the sub spindle is detachably attached to the main spindle without disassembling or removing the main spindle. According to this means, the main spindle is detachably attached to the main spindle without disassembling or removing the main spindle, for example, without removing a part of the main spindle or removing the main spindle from the headstock. Therefore, the attachment / detachment work of the sub-spindle becomes easy, and the work efficiency can be improved. Here, it is particularly preferable that the chuck portion is fixed to the sub spindle and the chuck portion can be detached from the main spindle while the chuck portion is mounted on the sub spindle.

Next, as a second invention according to the present application,
A spindle, disposed near both ends of the spindle, a pair of chucks directly or indirectly attached and fixed to the spindle, disposed between the pair of chucks in the internal space of the spindle, The chuck unit includes a stress applying mechanism that applies a stress for causing the chuck to grip the work, and an interlocking member connected to the stress applying mechanism and pulled out from both ends of the main shaft to the outside of the main shaft,
An open / closed state of the chuck portion is operable by moving the interlocking member, and is a double-end processing machine. With this configuration, the stress applying mechanism can be compactly housed in the main shaft, and the chucking unit can be operated and controlled by the interlocking member. Further, even if the processing mode is changed by eccentricity of the chucking unit, etc. This has the advantage that the complexity of the spindle structure and the enlargement of the spindle structure can be suppressed.

According to a seventh aspect of the present invention, in the stress applying mechanism, the chuck portion includes an elastic member for applying a gripping force to the work, and the chucking portion moves the interlocking member to resist the elastic force of the elastic member. It is preferable that the chuck portion is configured to be released from the work. In this case, it is preferable that the elastic force is applied in the axial direction of the main shaft, and the interlocking member is configured to move in the axial direction.

[0014] In the eighth aspect, the interlocking member is connected to an outer end portion pulled out of the main shaft, an engaging portion engaged with the chuck portion in a rotational direction, and the stress applying mechanism. It is desirable to have an inner end.

Next, in processing the extension member, the extension member is gripped and fixed inside the auxiliary member via a cylindrical auxiliary member which is eccentric with respect to the rotary drive source, and at least one of the extension members is fixed. A method of manufacturing an extension member, wherein the part is processed into an eccentric shape in a state where the portion is exposed to the outside. Examples of the extension member include various members having a shape elongated in a predetermined direction, such as a pipe and a shaft. By gripping and fixing the extension member inside the eccentric auxiliary member, a shape having a predetermined eccentric amount can be processed without providing a complicated structure.

Further, in processing at least one of the two ends of the extension member, the extension member is gripped and fixed inside the auxiliary member via a cylindrical auxiliary member eccentric with respect to the rotary drive source. A method of manufacturing an extension member, wherein the end is processed into an eccentric shape in a state where the end is exposed to the outside.

In the eleventh aspect, it is preferable that both end portions of the extension member are simultaneously processed into an eccentric shape with both end portions exposed to the outside. Since both ends of the extension member can be processed at the same time, productivity can be improved, and a shape error between both ends can be reduced. In each of the above-described manufacturing methods, it is preferable that a gripping mechanism is disposed inside the auxiliary member to grip and fix the extension member.

[0018]

Next, an embodiment according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing the structure of an embodiment of a double-sided processing machine according to the present invention. In this embodiment, a cylindrical main spindle 11 is rotatably mounted inside a headstock 10 via a bearing. Inside the main spindle 11, a cylindrical sub-spindle 12 has a bolt 13 through which an end is inserted.
Has been fixed by. Interlocking members 14 are inserted into the sub-spindle 12 from the left and right openings of the sub-spindle 12, respectively.

The interlocking member 14 includes a flange 14a formed at the outer end of the cylindrical body, and a pair of interlocking claw portions 14b extending from the body to the inside of the sub-spindle 12. The outer peripheral surface of the interlocking member 14 is the sub spindle 1
2 is in sliding contact with the inner peripheral surface. As shown in FIG. 2, the interlocking claw 14 b is formed to be vertically limited inside the sub-spindle 12, and the tip of the interlocking claw 14 b is in contact with the inside of the sub-spindle 12.
Is fixed by bolts.

Inside the interlocking member 14, a cylindrical collet guide 16 is in sliding contact. The collet guide 16 has an inclined inner surface portion 16a formed by a conical surface arranged inside the outer end portion of the interlocking member 14, a key hole 16b penetrating from the outer peripheral surface of the central portion to the inner space, and The formed large-diameter hole 16c is formed. A pair of flange-like portions 16d projecting outward are provided on the outer periphery of the collet guide 16, and these flange-like portions 16d are engaged with the interlocking claw portions 14b of the interlocking member 14 in the rotational direction as shown in FIG. It is formed to fit. The flange 16d is fixed to the sub spindle 12 via a bolt 16e.

The collet 1 is provided inside the collet guide 16.
7 is in sliding contact. The collet 17 has an inclined outer surface 17a having a conical surface formed near the outer end, a groove 17b extending halfway from the inclined outer surface 17a at the outer end toward the inner end, and a collet guide. The collet 1 receives the stop pin 18 screwed into the 16 key holes 16b.
An axial groove 17c extending in the axial direction for restricting the collet guide 7 in the rotational direction with respect to the collet guide 16 and a screw portion 17d formed at the inner end are formed.

A screw hole 19a of a draw bar 19 is screwed into the screw portion 17d of the collet 17. Drawbar 19
The base end portion 19b having the screw hole 19a is accommodated in the enlarged diameter hole portion 16c of the collet guide 16 in a loosely fitted state. The tip of the drawbar 19 is the drawbar ring 1
5 abuts. A screw portion 19c is formed near the tip of the draw bar 19, and a nut 20 is attached to the screw portion 19c.
Is screwed. On the outer periphery of the draw bar 19, an elastic member 2 composed of various springs such as a spring is provided between the base end portion 19b and the ring 21 abutting on the nut 20.
2 are armed. The elastic member 22 is accommodated between the collet guide 16 and the ring 21 in a compressed state. Since the collet guide 16 is fixed to the sub-spindle 12 by the flange-like portion 16d, the elastic member 22 supports the collet guide 16 and supports the collet 17 together with the draw bar 19 via the ring 21 and the nut 20 to the inside of the main shaft. Retract, inclined inner surface 16a
The diameter of the grip 17e of the collet 17 is reduced by the contact between the grip 17e and the inclined outer surface 17a. This allows the collet 17
The shaft 1 inserted into the inside can be firmly grasped.

The interlocking member 14 and the drawbar ring 15 connected to the interlocking member 14 are pressed inwardly of the main shaft by the ring 21 and the drawbar 19 by the elasticity of the elastic member 22. The distal end of the drive lever 23 is engaged with the flange 14a of the interlocking member 14. The drive lever 23 is rotatably mounted around a fulcrum 23a, and a base end of the drive lever 23 is connected to a drive shaft 24a of the actuator 24. The actuator 24 can be configured by an air cylinder, a hydraulic cylinder, a linear motor, a motor and a driving force conversion mechanism, and the like. Although the drive lever 23 and the actuator 24 are shown only for the chuck on the right side in the figure, the drive lever and the actuator having a symmetric structure are actually provided for the chuck on the left side in the figure.

Next, the releasing operation of the shaft 1, which is the work in the present embodiment, will be described. As mentioned above,
In the present embodiment, a pair of chucks are formed near both ends of the main spindle 11 and the sub-spindle 12, but in the following operation, the right chuck shown in FIG. 1 will be described. Actuator 24
When the drive shaft 24a is retracted from the illustrated state, the drive lever 23 rotates and pulls the flange 14a to the right side in the figure, and the drawbar ring 15 connected to the interlocking member 14 against the elastic force of the elastic member 22. To the outside of the main shaft. Then, the draw bar 19 is pushed to the right (outside) in the drawing, and the collet 17 is also pushed to the right (outside) in the drawing. On the other hand, since the collet guide 16 is fixed with respect to the sub-spindle 12 and does not move, the pressing state between the inclined inner surface portion 16a and the inclined outer surface portion 17a is relaxed. The diameter is expanded and the shaft 1 is released.

In using the present embodiment, the collet 17 is enlarged in diameter by the drive lever in the pair of chuck portions as described above.
For example, the shaft 1 is introduced. When the introduction of the shaft 1 is completed and both ends 1a and 1b of the shaft are set to protrude outside the collet 17, the flange 14a
Then, the drive lever 23 that returns to the original position (the position shown in the figure) returns to its original position (the position shown in the drawing), and each chuck portion grips the shaft 1 by the elastic force of the elastic member 22. Next, the main spindle 11 is rotated by a drive mechanism (not shown), and the sub-spindle 12 and the chuck unit rotate together. Then, by bringing a cutting tool (not shown) into contact with both ends 1a and 1b of the shaft 1, it is possible to perform a cutting process so as to have an eccentric shape as shown in the drawing.

In the embodiment shown in FIG. 1, the inner peripheral surface of the sub-spindle 12 is formed so as to be eccentric with respect to the outer peripheral surface, and the chuck portion is supported on the inner peripheral surface of the sub-spindle 12. The axis 11 of the main spindle 11
The axis 1c of the shaft 1, which is the work, is shifted with respect to
Axis 1 of both ends 1a, 1b of shaft 1 after processing
d also shifts with respect to the axis of the shaft 1. Thus, the eccentric shape of the sub spindle 12 causes the shaft 1
Can be processed very easily and precisely. Further, unlike the conventional simple eccentric processing machine, stable processing is possible, and the main spindle can be rotated at high speed.

In this embodiment, a draw bar 19, a nut 20, and a ring 21 are provided to drive a pair of chucks (constituted by a collet 17 and a collet guide 16) disposed near both ends of the main shaft. A stress applying mechanism comprising an elastic member 22 and an elastic member 22 is disposed inside the main shaft, and an interlocking member 14 is connected to the stress applying mechanism via a drawbar ring 15, and the interlocking member 14 is drawn out of both ends of the main shaft. It is configured to be driven. Accordingly, the chuck portion can be operated by driving the interlocking member 14, so that the work can be easily released and gripped without increasing the complexity and size of the main shaft. Here, the interlocking member 14 and the collet guide 16 are engaged in the rotational direction, and
Is configured so as to be synchronized in the rotational direction between the sub-spindle 12 and the collet guide 16 fixed by the flange, and to be movable in the axial direction.

Further, in this embodiment, since the sub-spindle 12 is configured to be detachable from the main spindle 11, it is possible to arbitrarily change the eccentricity of the work of the work only by changing the sub-spindle 12. it can. In particular,
Since the sub-spindle 12 can be replaced without removing the main spindle, the work can be switched efficiently even in a small-quantity multi-product production situation. In this embodiment,
As can be understood from the above structure, since the chuck portion is fixed to the sub-spindle 12, it is possible to remove the sub-spindle 12 from the main spindle without removing the chuck portion from the main spindle without removing the chuck portion from the sub-spindle. There is also the advantage that you can.

[0029]

As described above, according to the present invention, the sub-spindle is fixedly mounted on the main spindle which is driven to rotate, and the chuck portion is supported in contact with the sub-spindle. Even if the chuck part has a fixed shape, the work held by the chuck part can be appropriately fixed at a position deviated from the axis of the main spindle by appropriately setting the shape of the sub-spindle. Processing of an arbitrary shape such as a core shape can be performed. In addition, the amount of rotation can be sufficiently increased because no sliding bearing is used, and the amount of eccentricity can be adjusted simply by replacing the sub-spindle, so that the adjusting operation can be easily performed. .

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of a double-sided processing machine according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 to show the structure of the embodiment viewed in the axial direction.

[Explanation of symbols]

 10 Headstock 11 Main Spindle 12 Sub Spindle 13 Bolt 14 Interlocking Member 14a Flange 14b Interlocking Claw 15 Drawbar Ring 16 Collet Guide 16d Flange 17 Collet 18 Stopper Pin 19 Drawbar 20 Nut 21 Ring 22 Elastic Member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Manabu Nagasaka 3-5-5 Yamato, Suwa City, Nagano Prefecture Inside Seiko Epson Corporation (72) Inventor Yoichi Nakazawa 3-3-5 Yamato Suwa City, Nagano Prefecture Seiko Epson Co., Ltd. F term (reference) 3C045 CA06 CA07 CA08 FD04 FD05

Claims (12)

[Claims] 1. A chuck portion for gripping a work, comprising a main spindle rotatably driven as a rotatably supported main shaft, and a sub-spindle detachably attached to the main spindle. Is fixed in a state of being supported in contact with the sub-spindle. 2. The both-end processing machine according to claim 1, wherein the sub spindle is inserted and fixed in an inner space of the main spindle, and the chuck portion is inserted and arranged in an inner space of the sub spindle. 3. The both-end processing machine according to claim 1, wherein a support surface of the sub-spindle with respect to the chuck member is configured to be eccentric with respect to an axis of the main shaft. 4. One of claims 1 to 3
In the paragraph, the chuck section is disposed near both ends of the spindle, and the sub-spindle is configured to support the pair of chuck sections together. 5. A stress applying mechanism according to claim 4, wherein the stress applying mechanism is arranged between the pair of chucks in the internal space of the spindle, and applies a stress for causing the chucks to grip a work. An interlocking member connected to a stress applying mechanism and drawn out of both ends of the main shaft from the internal space, wherein the opening / closing state of the chuck portion can be operated by moving the interlocking member. A double-sided processing machine. 6. Any one of claims 1 to 5
In the above paragraph, the sub-spindle is detachably attached to the main spindle without disassembling or removing the main spindle. 7. A main shaft, a pair of chuck portions disposed near both ends of the main shaft and fixed directly or indirectly to the main shaft, and a pair of the chuck portions in an internal space of the main shaft. A stress applying mechanism for applying a stress for causing the chuck portion to grip the work, and an interlocking mechanism connected to the stress applying mechanism and pulled out from the internal space to both ends of the main shaft. A double-sided processing machine, comprising: a member; and an open / close state of the chuck portion is operable by moving the interlocking member. 8. The stress applying mechanism according to claim 7, wherein the chuck portion includes an elastic member for applying a gripping force to the workpiece, and moves the interlocking member to resist the elastic force of the elastic member. Wherein the chuck portion is released from the work. 9. The interlocking member according to claim 7, wherein the interlocking member includes an outer end portion pulled out of the main shaft, an engaging portion rotatably engaged with the chuck portion, and A both-end processing machine comprising a stress applying mechanism and an inner end connected to the stress applying mechanism. 10. When processing the extension member, the extension member is gripped and fixed inside the auxiliary member via a cylindrical auxiliary member eccentric to a rotary drive source, and at least a part of the extension member. A part thereof is processed into an eccentric shape in a state where the part is exposed to the outside. 11. In processing at least one end of both ends of the extension member, the extension member is gripped and fixed inside the auxiliary member via a cylindrical auxiliary member that is eccentric with respect to the rotary drive source. A method of manufacturing an extension member, wherein the end is processed into an eccentric shape with the end exposed to the outside. 12. The method for manufacturing an extension member according to claim 11, wherein the both end portions are simultaneously processed into an eccentric shape in a state where both end portions of the extension member are exposed to the outside.