JP2014151383A - Holding device for polishing shaft-like member and polishing apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding device for polishing a shaft-like member in which shape worsening and roughness variation in a finishing surface on the outer peripheral surface of the shaft-like member can be suppressed, and labor work and time in process change-over can be saved.SOLUTION: A holding device comprises: a holding jig 21 which holds a shaft-like member that is an article to be polished; a linear guide 14 which holds the holding jig 21 as slidable in a first direction; a movable stopper 15 which slides linked with sliding of the holding jig 21 in the first direction; a constant load spring 16 the tip of which is coupled with the movable stopper 15 and which applies a first constant reactive force to the holding jig 21 against the sliding of the holding jig 21 in the first direction; a linear guide 18 which holds the holding jig 21 as slidable in a second direction orthogonal to the first direction; a movable stopper 19 which slides linked with sliding of the holding jig 21 in the second direction; and a constant load spring 20 the tip of which is coupled with the movable stopper 19 and which applies a second constant reactive force to the holding jig 21 against the sliding of the holding jig 21 in the second direction.

Description

  The present invention relates to a holding device for polishing a shaft-shaped member that holds the shaft-shaped member when the surface of the shaft-shaped member is polished, and a polishing apparatus using the holding device.

  Conventionally, as a device provided with a shaft-like member that needs to be polished by a polishing device, for example, there is a rotary compressor. The rotary compressor incorporates an electric motor and a compression mechanism in a sealed container, and includes a crankshaft as a shaft-like member as a component that transmits the rotational force generated by the electric motor to the compression mechanism. The crankshaft has a long shaft portion, an eccentric shaft portion, and a short shaft portion, and the long shaft portion and the short shaft portion are rotatably supported by the upper bearing and the lower bearing.

  The compression mechanism has a cylinder in which a cylindrical through hole is formed in the center so as to penetrate upward. In the cylinder, the upper and lower sides of the through hole are closed by the flange type upper bearing and the lower bearing, and a cylinder chamber is formed in the cylinder.

  The eccentric shaft portion of the crankshaft is located in the cylinder chamber, and a ring-shaped rolling piston is rotatably fitted around the eccentric shaft portion. The tip of the vane urged by the spring is always in contact with the outer periphery of the rolling piston, and the cylinder chamber is divided into a compression chamber and a refrigerant suction chamber. In the rotary compressor configured as described above, the rolling piston eccentrically rotates in the cylinder chamber as the crankshaft rotates, and the compression operation is performed by gradually reducing the volume of the compression chamber divided by the vanes.

  As described above, the crankshaft rotates and slides with the upper bearing, the lower bearing, and the rolling piston. For this reason, if the roughness of the surface of the crankshaft is rough, the friction is large and the mechanical efficiency is deteriorated. Therefore, after the crankshaft is formed into an axial shape by grinding, it is necessary to polish the outer peripheral surface, which is a sliding portion, and finish the shape and roughness with high accuracy.

  In the conventional crankshaft polishing device, the long shaft portion of the crankshaft is held by a holding jig, and the surface of the crankshaft is removed by a polishing tool (for example, a brush) attached to a machining center (a machine tool that can be numerically controlled) or a spindle of a robot. Polishing. Specifically, the surface of the crankshaft is polished by rotating the polishing tool around the main axis and simultaneously moving the polishing tool by NC control along the outer peripheral shape of the crankshaft (hereinafter referred to as contouring). Is going.

  Further, as another general surface polishing apparatus, there is an apparatus that presses a polishing tool against an object to be polished placed on a mounting table from above to polish the surface of the object to be polished (see, for example, Patent Document 1). .) In this polishing apparatus, a constant load pressing mechanism equipped with a constant load spring or the like is provided on the main spindle side of the polishing tool, and the constant load spring expands and contracts so that the polishing tool is pressed against the surface of the workpiece with a constant load. The surface is polished uniformly.

JP-A-5-57584 (pages 5-7, FIG. 1)

  The conventional crankshaft polishing apparatus for polishing the crankshaft surface by contouring has the following problems. That is, the crankshaft has a shape in which the shaft diameter and the eccentric amount are different between the long shaft portion and the short shaft portion and the eccentric shaft portion. It is necessary to change the mounting position of the holding jig, change the program, change the contouring diameter (the diameter of the polishing tool trajectory during contouring), etc.

  For this reason, there is a need for a technique capable of surface polishing even with a shaft-like member having a different shaft diameter or a different amount of eccentricity in the axial direction while reducing the time and effort of changing the setup.

  Further, since the polishing tool wears with the number of processes, there is a problem that when the polishing operation is not properly corrected in consideration of wear, the shape of the finished surface is deteriorated and the roughness is varied.

  Moreover, the grinding | polishing method which provided the constant load press mechanism in the grinding tool spindle side like patent document 1 is grinding | polishing by the constant pressure mechanism of only one direction of a spindle direction (up-down direction). For this reason, it is suitable for polishing a flat plane, but is not suitable for polishing a shaft-shaped member having a curved surface and a stepped shape.

  The present invention has been made to solve the above-described problems, and can suppress the deterioration of the finished surface shape and the roughness of the outer peripheral surface of the shaft-like member, and can save time and effort for changing the setup. An object of the present invention is to provide a holding device for polishing a shaft-shaped member that can be used, and a polishing device using the holding device.

  A holding apparatus for polishing a shaft-shaped member according to the present invention includes a holding jig for holding a shaft-shaped member as an object to be polished, a first linear guide for holding the holding jig slidably in a first direction, and a holding A first movable stopper that slides in conjunction with the slide in the first direction of the jig, and a distal end portion connected to the first movable stopper, and a constant reaction to the holding jig with respect to the slide in the first direction of the holding jig. A first constant load spring that applies force, a second linear guide that slidably holds the holding jig in a second direction orthogonal to the first direction, and slides in conjunction with the sliding of the holding jig in the second direction. A second movable stopper and a second constant load spring having a tip connected to the second movable stopper and applying a constant reaction force to the holding jig against the slide in the second direction of the holding jig. is there.

  According to this invention, when a pressing load is applied from the polishing tool to the shaft-like member held by the holding jig, the holding jig moves, and the constant load spring expands and contracts in accordance with the movement. Accordingly, a constant pressing load is applied to the shaft-shaped member from the polishing tool regardless of the difference in the shaft shape of the shaft-shaped member. As a result, it has the effect of suppressing deterioration of the finished surface shape of the shaft-like member and variation in roughness. In addition, since the holding jig moves so as to follow the shaft shape of the shaft-like member and the difference in the shaft shape is absorbed by the movement of the holding jig, there is no need to change according to the shaft shape. Have.

It is a side view of the whole grinding | polishing apparatus provided with the holding device for grinding | polishing of the shaft-shaped member in Embodiment 1 of this invention. It is a top view of the holding apparatus for grinding | polishing of the shaft-shaped member of FIG. It is a figure which shows operation | movement of the grinding | polishing apparatus in Embodiment 1 of this invention. 4A is an enlarged schematic plan view of the polishing tool and the crankshaft of FIG. 3A, and FIG. 4B is an enlarged schematic plan view of the polishing tool and the crankshaft of FIG. 3B. It is a side view of the whole grinding | polishing apparatus provided with the holding | maintenance apparatus for grinding | polishing in Embodiment 2 of this invention. It is a top view of the whole grinding | polishing holding | maintenance apparatus in Embodiment 2 of this invention. It is a figure which shows operation | movement of the grinding | polishing apparatus in Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a side view of the entire polishing apparatus provided with a holding device for polishing a shaft-like member according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the holding device for polishing the shaft-shaped member of FIG. In FIG. 1 and FIG. 2, the shaded portion indicates the shaft-like member held by the holding member for polishing the shaft-like member. In FIG. 1 and the drawings to be described later, the same reference numerals denote the same or corresponding parts, which are common throughout the entire specification. Furthermore, the forms of the constituent elements appearing in the entire specification are merely examples and are not limited to these descriptions.

  The polishing apparatus 1 includes a shaft-shaped member polishing holding device (hereinafter simply referred to as a polishing holding device) 10 and a polishing tool 30 for polishing the shaft-shaped member held by the polishing holding device 10. . Here, as an example of the shaft-like member to be polished, a case where the crankshaft 2 that transmits the rotational force of the electric motor to the compression mechanism in a rotary compressor is polished will be described as an example. The crankshaft 2 has a short shaft portion 2a, an eccentric shaft portion 2b, and a long shaft portion 2c. The eccentric shaft portion 2b has a larger outer diameter than the short shaft portion 2a and the long shaft portion 2c, and is provided eccentric to the short shaft portion 2a and the long shaft portion 2c.

  The polishing holding apparatus 10 includes an apparatus base 11 and a movement holding mechanism 12 that holds the crankshaft 2 and moves on the apparatus base 11.

  The moving and holding mechanism 12 is provided with a linear guide 14 that holds the X table 13 so as to be slidable in the X direction. A pair of movable stoppers 15 that slide in conjunction with the slide of the X table 13 are disposed at both ends of the X table 13 in the X direction. Here, the movable stopper 15 is slidably held by the linear guide 14 in the same manner as the X table 13. The pair of movable stoppers 15 are not fixed to the X table 13 and can be brought into contact with and separated from the X table 13.

  The device base 11 is provided with a pair of constant load springs 16 that are spaced apart from each other in the X direction. The constant load spring 16 is a belt-shaped plate spring 16 a wound around a drum portion 16 b in a coil shape. The drum portion 16 b is mounted on the apparatus base 11, and the tip of the plate spring 16 a is connected to a pair of movable stoppers 15. It is connected.

  When the leading end of the leaf spring 16a is extended from the drum portion 16b, the constant load spring 16 is always attached in a direction in which the leaf spring 16a rewinds around the drum portion 16b regardless of the length of the leaf spring 16a. It is a spring that generates power. By attaching the tip of the constant load spring 16 having such a function to the movable stopper 15, a constant reaction force is always applied to the X table 13 regardless of the slide amount of the X table 13 in the X direction. Thirteen slides are limited. The pair of constant load springs 16 has a natural length when not polished, and expands and contracts when a pressing load from the polishing tool 30 is applied to the crankshaft 2 during polishing. Is supposed to give.

  A linear guide 18 is fixed on the X table 13 to hold the Y table 17 slidable in the Y direction. A pair of movable stoppers 19 that slide in conjunction with the slide of the Y table 17 are arranged at both ends of the Y table 17 in the Y direction. Here, the movable stopper 19 is slidably held by the linear guide 18 in the same manner as the Y table 17. The pair of movable stoppers 19 are not fixed to the Y table 17 like the pair of movable stoppers 15, and can be brought into and out of contact with the Y table 17.

  The X table 13 is provided with a pair of constant load springs 20 that face each other in the Y direction. The constant load spring 20 is a belt-shaped plate spring wound around a drum portion in a coil shape, like the constant load spring 16, and the drum portion is mounted on the X table 13, and the tip end portion of the plate spring is a pair. It is connected to the movable stopper 19.

  As with the constant load spring 16, the constant load spring 20 is always constant in the direction in which the plate spring rewinds to the drum portion regardless of the length of the leaf spring when the outer end of the plate spring is extended from the drum portion. It is a spring that generates the urging force. By attaching the tip of the constant load spring 20 having such a function to the movable stopper 19, a constant reaction force is always applied to the Y table 17 regardless of the slide amount of the Y table 17 in the X direction. 17 slides are limited. As with the pair of constant load springs 16, the pair of constant load springs 20 has a natural length when not polished, and expands and contracts when a pressing load from the polishing tool 30 acts on the crankshaft 2 during polishing. Thus, a certain reaction force is applied to the X table 13.

  A holding jig 21 that holds and holds the long shaft portion 2 c of the crankshaft 2 is fastened on the X table 13.

  The movable holding mechanism 12 configured as described above operates as follows when a pressing load in the XY plane direction acts on the crankshaft 2 held by the holding jig 21 by the polishing tool 30. That is, the constant load springs 16 and 20 expand and contract according to the shaft diameter and eccentricity of the portion to be polished in the crankshaft 2, and the crankshaft 2 moves in the XY plane direction.

  The polishing tool 30 is attached to a main shaft of a machining center (not shown), rotates around the main shaft, and moves around the crankshaft 2. The polishing tool 30 includes a polishing portion 30a such as a nylon brush, a wire brush, or a non-woven fabric, and polishes the entire outer periphery of the crankshaft 2 by contouring while pressing the polishing portion 30a against the outer periphery of the crankshaft 2. . That is, the entire outer periphery of the crankshaft 2 is polished by causing relative movement between the polishing tool 30 and the crankshaft 2 while pressing the polishing portion 30 a of the polishing tool 30 against the outer peripheral surface of the crankshaft 2.

  Next, the operation of the polishing apparatus 1 will be described. The contouring diameter of the polishing tool 30 is set in accordance with the shaft diameters of the long shaft portion 2c and the short shaft portion 2a of the crankshaft 2, and when the eccentric shaft portion 2b of the crankshaft 2 is polished, the contouring diameter is the same. A description will be given assuming that the eccentric shaft portion 2b of the crankshaft 2 is polished while the long shaft portion 2c and the short shaft portion 2a are being polished without changing.

  FIG. 3 is a diagram showing the operation of the polishing apparatus according to Embodiment 1 of the present invention. FIG. 3A shows polishing of a portion (long shaft portion and short shaft portion) where the shaft diameter of the crankshaft 2 is small, and FIG. 3B shows polishing of a portion (eccentric shaft portion) where the shaft diameter of the crankshaft is large. ing. In FIG. 3, the white arrow indicates the movement direction of the polishing tool 30, and the solid line arrow in the vicinity of the movement holding mechanism 12 indicates the movement direction of the movement holding mechanism 12. The dotted arrow indicates the direction of the pressing load of the polishing tool 30 on the crankshaft. 4A is an enlarged schematic plan view of the polishing tool and the crankshaft of FIG. 3A, and FIG. 4B is an enlarged schematic plan view of the polishing tool and the crankshaft of FIG. 3B.

  As shown in FIG. 3A, when the pressing load from the polishing tool 30 acts in the direction of the dotted arrow in FIG. 13 slides on the linear guide 14 in a state where the movement is restricted by the movable stopper 15. At that time, the constant load spring 16 connected to the movable stopper 15 extends in the X direction while maintaining a constant reaction force. Since the constant load spring 16 expands and contracts in accordance with the pressing load while the short shaft portion 2a (the same applies to the long shaft portion 2c) of the crankshaft 2 is being polished by the polishing tool 30, the crankshaft 2 has its axis A constant pressing load is applied from the polishing tool 30 regardless of the shape (the size of the shaft diameter, the amount of eccentricity) and the cutting amount by the polishing tool 30 (the amount by which the polishing tool cuts into the workpiece).

  Similarly, the polishing tool 30 moves in the direction of the white arrow and is positioned at the position indicated by the dotted line in FIG. 4A, and the pressing load of the polishing tool 30 is applied to the crankshaft 2 by the dotted arrow in FIG. When acting in the Y direction, the Y table 17 slides in the Y direction on the linear guide 18 with the movement restricted by the movable stopper 19. At that time, the constant load spring 20 connected to the movable stopper 19 extends while maintaining a constant reaction force. Since the constant load spring 20 expands and contracts according to the pressing load while the crankshaft 2 is being polished, the crankshaft 2 similarly has its shaft shape (the size of the shaft diameter, the amount of eccentricity) and the polishing tool 30. A constant pressing load is applied from the polishing tool 30 regardless of the depth of cut.

  From the above, it is possible to suppress deterioration of the finished surface shape of the outer peripheral surface of the crankshaft 2 and variations in roughness.

  Further, when the pressing load of the polishing tool 30 acts on the crankshaft 2 in directions other than the X and Y directions (for example, 45 ° direction), both the constant load spring 16 in the X direction and the constant load spring 20 in the Y direction are applied. A force acts on the crankshaft 2. In this case, the resultant force of the urging force in the X direction and the Y direction acts on the crankshaft 2 as a pressing load. For this reason, when the resultant force is a pressing load, a pressing load twice the square root (about 1.4142) in the case of only one of the X direction and the Y direction acts, and the pressing load increases. However, the pressing load in at least the two directions of the X direction and the Y direction can be the same, and variations in the pressing load can be suppressed.

  Then, when the polishing of the short shaft portion 2a having a small shaft diameter shown in FIG. 3A is completed and the eccentric shaft portion 2b having a large shaft diameter and eccentric as shown in FIG. 3B is polished, The polishing tool 30 is lowered. Then, the eccentric shaft portion 2b is pushed in the direction of the solid arrow in FIGS. 3B and 4B by the pressing load of the polishing tool 30, and the polishing portion 30a of the polishing tool 30 reaches the height position of the eccentric shaft portion 2b. It descends and comes into contact with the eccentric shaft portion 2b. As apparent from comparison between FIG. 3A and FIG. 3B, there is a step between the short shaft portion 2a and the eccentric shaft portion 2b, but the polishing tool 30 passes through this step. It is comprised so that it can move from the short shaft part 2a to the eccentric shaft part 2b.

  In this state, as shown in FIG. 3B, the constant load spring 16 of one of the pair of constant load springs 16 (here, the left side of FIG. 3B) is compared to the case of FIG. Will be extended. That is, as shown in FIG. 4B, the position of the eccentric shaft portion 2b slides from the dotted line position to the solid line position. Thereby, it is possible to perform polishing of portions having different shaft diameters and eccentric amounts without changing the contouring diameter of the polishing tool 30. Further, even when the eccentric shaft portion 2b having a shaft diameter different from the short shaft portion 2a and the long shaft portion 2c is polished, the pressing load received by the eccentric shaft portion 2b from the polishing tool 30 is the short shaft portion 2a and the long shaft. This is the same as the polishing of the portion 2c.

  As described above, according to the first embodiment, the holding jig 21 that holds the crankshaft 2 is held by the linear guides 14 and 18 so as to be slidable in the X and Y directions. Since the constant load springs 16 and 19 are connected to the movable stoppers 15 and 19 that slide along with the sliding in the Y direction, the following effects can be obtained.

  That is, when the holding jig 21 moves on the XY plane by the pressing load of the polishing tool 30, the constant load spring acts in any direction on the XY plane. For this reason, the crankshaft 2 receives a constant pressing load from at least the pressing load in the X direction and the Y direction from the polishing tool 30, and can suppress variations in the pressing load.

  That is, since the holding jig 21 is moved in accordance with the movement of the polishing tool 30 and the constant load spring is expanded and contracted, the crankshaft 2 is independent of the difference in shaft shape, the amount of cutting of the polishing tool, and the wear of the polishing tool. A certain pressing load acts on the polishing tool 30. Therefore, it has the effect of suppressing deterioration of the finished surface shape of the outer peripheral surface of the crankshaft 2 and variation in roughness. Further, since the polishing tool 30 is pressed against the crankshaft 2 with a constant load, it is not necessary to compensate for wear when the polishing tool 30 is worn.

  Further, if the number of constant load springs is increased and the constant load springs are interpolated in directions other than the X and Y directions, variations in the pressing load in a plurality of directions can be further suppressed.

  Further, the holding jig 21 slides on the linear guides 14 and 18 in the XY plane direction according to the direction in which the polishing tool 30 acts and the cutting depth, and the position of the holding jig 21 moves. For this reason, when the outer peripheral surface of the crankshaft 2 having a different shaft diameter and eccentric amount in the axial direction is polished, even if the shape of the crankshaft 2 changes depending on the model of the compressor, the holding jig 21 is provided with the crankshaft 2. The movement of the holding jig 21 is absorbed by the movement of the holding jig 21. For this reason, it is not necessary to change the mounting position of the jig according to the shaft shape and the cutting depth, the program, the contouring diameter, and the like. Therefore, it is possible to save labor and time required for the changeover.

  In addition, in the configuration in which the constant load pressing mechanism is provided on the polishing tool spindle side as in the prior art, when the weight of the polishing tool is heavy, the constant load pressing mechanism may not be attached due to the limit of the maximum polishing tool weight of the machine tool or robot. is there. However, in the polishing apparatus 1 of the first embodiment, a constant load pressing mechanism (moving and holding mechanism 12) is provided on the holding side of the crankshaft 2. For this reason, it is not necessary to worry about the limitation of the maximum polishing tool weight of the machine tool or the robot, and any equipment can be installed as long as there is a space for mounting the polishing holding device 10. Therefore, regardless of the weight of the polishing tool, it is possible to perform highly accurate polishing while suppressing variations in surface roughness.

Embodiment 2. FIG.
In the first embodiment described above, the polishing tool 30 is contoured along the outer periphery of the crankshaft 2 to polish the entire outer periphery of the crankshaft. In contrast, in the second embodiment, the crankshaft 2 is axially rotated to polish the entire outer periphery of the crankshaft without causing the polishing tool 30 to perform a contouring operation.

FIG. 5 is a side view of the entire polishing apparatus provided with the polishing holding apparatus according to Embodiment 2 of the present invention. FIG. 6 is a plan view of the entire polishing holding apparatus according to Embodiment 2 of the present invention.
A polishing apparatus 1A shown in FIGS. 5 and 6 has a polishing holding apparatus 10A and a polishing tool 30 for polishing the crankshaft 2 as a shaft-like member held by the polishing holding apparatus 10A.

  The polishing holding apparatus 10A includes an apparatus base 11 and a movement holding mechanism 12A that holds the crankshaft 2 and moves on the apparatus base 11.

  A linear guide 14 that holds the X table 13 so as to be slidable in the X direction is fixed on the apparatus base 11 in the movement holding mechanism 12A. A movable stopper 15 that slides in conjunction with the slide of the X table 13 is disposed at one end of the X table 13 in the X direction. Here, the movable stopper 15 is slidably held by the linear guide 14 in the same manner as the X table 13. The movable stopper 15 may be fixed to the X table 13 or may be contactable / separable.

  The device base 11 is provided with a constant load spring 16 similar to that of the first embodiment, the drum portion 16b is mounted on the device base 11, and the tip of the leaf spring 16a is connected to the movable stopper 15. . In the second embodiment, unlike the first embodiment, there is one constant load spring.

  A holding jig 21 that holds and holds the long shaft portion 2 c of the crankshaft 2 is fastened on the X table 13. The movement holding mechanism 12A includes a rotation mechanism (not shown) that rotates the crankshaft 2. The crankshaft 2 is rotated in the direction of arrow c in FIG. 6 by this rotation mechanism. The rotation mechanism may be provided around the crankshaft 2 of the holding jig 21 to rotate the crankshaft 2 or may rotate the crankshaft 2 by rotating the holding jig 21 itself.

  In the first embodiment, the polishing tool 30 is attached to the main shaft of a machining center (not shown), and rotates around the main shaft and is contoured. On the other hand, the second embodiment is similar in that it rotates about the main axis of a machining center (not shown), but no contouring is performed.

  Next, the operation of the polishing apparatus 1A will be described. The contouring diameter of the polishing tool 30 is set in accordance with the shaft diameters of the long shaft portion 2c and the short shaft portion 2a of the crankshaft 2, and when the eccentric shaft portion 2b of the crankshaft 2 is polished, the contouring diameter is the same. A description will be given assuming that the eccentric shaft portion 2b of the crankshaft 2 is polished while the long shaft portion 2c and the short shaft portion 2a are being polished without changing.

  FIG. 7 is a diagram showing the operation of the polishing apparatus according to Embodiment 2 of the present invention. FIG. 7A shows polishing of a portion having a small shaft diameter (long shaft portion and short shaft portion), and FIG. 7B shows polishing of a portion having a large shaft diameter of crankshaft 2 (eccentric shaft portion). Show. In FIG. 7, the white arrow indicates the movement direction of the polishing tool 30, and the solid line arrow indicates the movement direction of the movement holding mechanism 12. The dotted arrow indicates the direction of the pressing load of the polishing tool 30 on the crankshaft 2. Hereinafter, the operation of the polishing apparatus 1A according to the second embodiment will be described mainly with respect to parts different from the polishing apparatus 1 according to the first embodiment.

  In the polishing apparatus 1A of the second embodiment, as shown in FIGS. 7A and 7B, the pressing load of the polishing tool 30 acts in the X direction of the crankshaft 2, and the movable stopper 15 slides on the linear guide 14. To do. At that time, the constant load spring 16 connected to the movable stopper 15 extends while maintaining a constant reaction force. Since the constant load spring 16 expands and contracts according to the pressing load while the crankshaft 2 is being polished, the crankshaft 2 has its shaft shape (shaft diameter size, eccentric amount), and the cutting of the polishing tool 30. Regardless of the amount, a constant pressing load is applied from the polishing tool 30. Further, the polishing tool 30 is stopped at that position without being contoured, while the crankshaft 2 is axially rotated by a rotating mechanism (not shown) to polish the entire outer periphery of the crankshaft 2.

  As described above, according to the second embodiment, since the crankshaft 2 is rotated, the same effect as that of the first embodiment can be obtained without causing the polishing tool 30 to be contoured.

  In the first and second embodiments, the crankshaft 2 of the rotary compressor is taken as an example of the shaft-like member, but the shaft-like member to be polished in the present invention is limited to the crankshaft of the rotary compressor. Instead, it may be a shaft-like member of another device such as a crankshaft of an automobile part.

  DESCRIPTION OF SYMBOLS 1 Polishing apparatus, 1A Polishing apparatus, 2 Crankshaft, 2a Short shaft part, 2b Eccentric shaft part, 2c Long shaft part, 10 Polishing holding apparatus, 10A Polishing holding apparatus, 11 Equipment base, 12 Moving holding mechanism, 12A Moving Holding mechanism, 13 X table, 14 Linear guide, 15 Movable stopper, 16 Constant load spring, 16a Leaf spring, 16b Drum part, 17 Y table, 18 Linear guide, 19 Movable stopper, 20 Constant load spring, 20a Polishing part, 21 Holding jig, 30 polishing tool, 30a polishing section.

Claims (5)

A holding jig for holding a shaft-like member to be polished;
A first linear guide for slidably holding the holding jig in a first direction;
A first movable stopper that slides in conjunction with sliding in the first direction of the holding jig;
A first constant load spring having a tip connected to the first movable stopper, and applying a constant reaction force to the holding jig against the sliding of the holding jig in the first direction;
A second linear guide for slidably holding the holding jig in a second direction orthogonal to the first direction;
A second movable stopper that slides in conjunction with the sliding in the second direction of the holding jig;
A tip portion is connected to the second movable stopper, and a second constant load spring that applies a constant reaction force to the holding jig with respect to the slide of the holding jig in the second direction is provided. A holding device for polishing a shaft-shaped member. Equipment base,
A holding jig for holding a shaft-like member to be polished, and a moving holding mechanism that moves on the apparatus base;
The movement holding mechanism is
A first linear guide provided on the apparatus base and slidably holding the first table in a first direction;
A pair of first movable stoppers disposed at both ends of the first table in the first direction and sliding along with the slide of the first table;
A pair of first constant load springs having tip portions connected to the pair of first movable stoppers and applying a constant reaction force to the first table with respect to sliding in the first direction of the first table;
A second linear guide provided on the first table and slidably held in a second direction orthogonal to the first direction, the second table having the holding jig fixed on the upper surface;
A pair of second movable stoppers disposed at both ends of the second table in the second direction and sliding along with the slide of the second table;
A pair of second constant load springs, each having a tip connected to the pair of second movable stoppers, and applying a constant reaction force to the second table with respect to movement of the second table in the second direction. A holding device for polishing a shaft-like member, characterized in that: A holding jig for holding a shaft-like member to be polished;
A first linear guide for slidably holding the holding jig in a first direction;
A first movable stopper that slides in conjunction with sliding in the first direction of the holding jig;
A first constant load spring having a tip connected to the first movable stopper, and applying a constant reaction force to the holding jig against the sliding of the holding jig in the first direction;
A holding apparatus for polishing a shaft-shaped member, comprising: a rotation mechanism that rotates the shaft-shaped member. Equipment base,
A holding jig for holding a shaft-like member to be polished, and a moving holding mechanism that moves on the apparatus base;
The movement holding mechanism is
A first linear guide provided on the apparatus base and slidably holding the first table in a first direction;
A pair of first movable stoppers disposed at both ends of the first table in the first direction and sliding along with the slide of the first table;
A pair of first constant load springs having tip portions connected to the pair of first movable stoppers and applying a constant reaction force to the first table with respect to sliding in the first direction of the first table;
A holding apparatus for polishing a shaft-shaped member, comprising: a rotation mechanism that rotates the shaft-shaped member. A holding apparatus for polishing a shaft-shaped member according to any one of claims 1 to 4,
A polishing tool,
A polishing apparatus for polishing the outer peripheral surface by causing relative movement between the polishing tool and the shaft-shaped member while pressing a polishing portion of the polishing tool against the outer peripheral surface of the shaft-shaped member.

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