WO2022259412A1 - Coated-surface modification device and production method for rotary compressor - Google Patents

Abstract

A coated-surface modification device that is characterized by comprising a modification tool (80) and a pressing mechanism (60) that presses the modification tool (80) such that the modification tool (80) conforms to a coated surface of a crankshaft (50). The coated-surface modification device is also characterized in that a cross-section of the modification tool (80) that is perpendicular to the axis of the crankshaft (50) comprises an arc-shaped recessed part (82) that is larger than the diameter of a coated section and groove parts (83, 88) that are formed in the recessed part (82) and are narrower than the diameter of the coated section. The coated-surface modification device is also characterized in that, while the crankshaft (50) is rotated, protruding parts (90) of the coated surface are removed by edge parts (84) formed at the boundaries between the recessed part (82) and the groove parts (83, 88).

Description

Coated surface correction device and rotary compressor manufacturing method

This application relates to a manufacturing method for a painted surface correction device and a rotary compressor.

　Sliding parts, such as the crankshaft of a rotary compressor, are generally surface-treated to improve their slidability. Among surface treatments, there is a method of forming a film by painting, and in the process of painting, an operation is performed to prepare the painted surface by removing convex portions on the painted surface. These protrusions are caused by dust in the coating environment, foreign substances in the coating liquid, and lumps of the coating. The existence of such a convex portion causes deterioration of slidability and assembly error, resulting in a decrease in commercial value.

Sandpaper, a whetstone, or a tool such as that of Patent Document 1 is known as a tool for correcting such a painted surface.

Japanese Patent No. 4676349

These conventional tools were used to scrape while partially pressing against the convex portion. Therefore, since it is necessary to confirm the convex portion, there is a problem that it is difficult to improve the workability. Moreover, when processing the entire surface in order to omit the work of confirming the convex portions, there is a problem that the normal surface is also damaged and the quality is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a coated surface capable of efficiently and reliably removing convex portions without damaging portions of the painted surface of a crankshaft having no convex portions. The purpose is to obtain a corrective device.

The painted surface correcting device disclosed in the present application includes a correcting tool and a pressing mechanism that presses the correcting tool while following the painted surface of the crankshaft. It consists of an arc-shaped concave portion larger than the concave portion and a groove portion formed on the concave portion and having a width smaller than the diameter of the painted portion. is characterized by removing the convex part of

According to the painted surface correcting device disclosed in the present application, it is possible to efficiently and reliably remove the convex portion without damaging the non-convex portion of the painted surface of the crankshaft.

1 is a cross-sectional view of a rotary compressor having a crankshaft, which is a workpiece of the painted surface correcting device according to Embodiment 1. FIG. 1 is a schematic configuration diagram of a painted surface correcting device according to Embodiment 1; FIG. 1 is a perspective view of a crankshaft that is a workpiece; FIG. FIG. 2 is a side view of the painted surface correcting tool unit according to Embodiment 1; FIG. 5 is a cross-sectional view taken along the line AA in FIG. 4; 4 is a front cross-sectional view when the upper eccentric portion correction tool unit according to Embodiment 1 is pressed against the crankshaft; FIG. FIG. 4 is a front cross-sectional view when the crankshaft is rotated and the phase is changed while the upper eccentric portion correction tool unit according to Embodiment 1 is being pressed against the crankshaft; 1 is a front cross-sectional view of a correction tool according to Embodiment 1; FIG. 4 is a front cross-sectional view when the correction tool according to Embodiment 1 is pressed against the upper eccentric portion; FIG. FIG. 4 is a diagram showing surface photographs and cross-sectional shapes before and after the painted surface is processed by the painted surface correcting device according to the first embodiment; FIG. 8 is a front view of a correction tool according to Embodiment 2; FIG. 11 is a front view of a correction tool according to Embodiment 3;

Preferred embodiments of the painted surface correcting device according to the present application will be described below with reference to the drawings. The same reference numerals are assigned to the same contents and corresponding parts, and detailed description thereof will be omitted. In the following embodiments as well, redundant descriptions of the configurations denoted by the same reference numerals will be omitted.

Embodiment 1.
FIG. 1 shows a rotary compressor 1 having a crankshaft 50, which is a workpiece of a painted surface correcting apparatus according to Embodiment 1. As shown in FIG. The rotary compressor 1 is manufactured by arranging the crankshaft 50, which has a modified coating surface as will be described later, in the center. The operation of the rotary compressor 1 will be briefly described. The crankshaft 50 is rotationally driven by the electric mechanism section 4 having the rotor 2 fixed to the crankshaft 50 and rotated by the electromagnetic force of the stator 3 . As a result, the rolling pistons 6 fixed to the upper eccentric portion 53 and the lower eccentric portion 54 of the crankshaft 50 rotate along the inner peripheral surface of the cylinder block 5 . A vane (not shown) sliding in contact with the outer peripheral surface of the rolling piston 6 divides the cylinder chamber in the cylinder block 5 into a suction chamber for sucking the refrigerant and a compression chamber for compressing the refrigerant. Refrigerant is compressed by a compression mechanism portion 7 composed of a cylinder block 5, a rolling piston 6, and vanes. The number of rolling pistons 6 is not limited to two, and a rotary compressor having one or three or more rolling pistons 6 may be used.

Since the crankshaft 50 slides on a plurality of other parts, its surface is coated with a lubricating paint or the like in order to improve slidability. A painted surface correcting device 100 for correcting the painted surface will be described.

FIG. 2 is a schematic configuration diagram of the painted surface correcting device 100 according to the first embodiment. The painted surface correction device 100 includes a rotation support device 20 that rotatably supports a crankshaft 50 that is an object to be processed, and a rotation drive device 30 that rotates the crankshaft 50 . Further, an elevating device 40 that can be driven in a direction perpendicular to the axis of the crankshaft 50 is provided. A painted surface correction tool unit 60 for correction is attached.

By driving the lifting device 40, the painted surface correction tool unit 60 is pressed against the crankshaft 50, and the rotation drive device 30 rotates the crankshaft 50, thereby correcting the painted surface of the crankshaft 50.

FIG. 3 is a perspective view of a crankshaft 50 that is a workpiece. The crankshaft 50 has a main shaft portion 51, a subshaft portion 52, an uncoated shaft portion 55, which are coaxially provided, and an upper eccentric portion 53 and a lower eccentric portion which are provided on different axes parallel to the axis of the crankshaft 50. 54. Since the main shaft portion 51, the sub shaft portion 52, the upper eccentric portion 53, and the lower eccentric portion 54 slide against other parts, they are painted to improve their slidability. Protrusions on these surfaces affect assembly accuracy and adversely affect slidability, so correction processing is required to remove the protrusions.

In addition, an upper center hole 56 and a lower center hole 58 are formed at both ends of the crankshaft 50 for use in processing and for supplying oil. Further, a drive groove 57 is formed on the outer side of the upper center hole 56 . The upper center hole 56 is used to engage the rotation support device 20, and the lower center hole 58 is used to engage the rotation drive device 30, thereby supporting the crankshaft 50 from both sides and rotating the drive groove 57. It is configured to rotate the crankshaft 50 by being attached to the drive portion of the drive device 30 .

However, the shape of the workpiece is not limited to the above. For example, if the non-coated shaft portion 55 is gripped and rotated, it can be applied to a shape that does not have the upper center hole 56 and the drive groove 57 . Also, even if the lower center hole 58 is not provided, the outer diameter portion of the sub shaft portion 52 may be rotatably supported by a roller or the like.

4 is a side view of the painted surface correction tool unit 60. FIG. A main shaft portion correcting tool unit 61, a sub shaft portion correcting tool unit 62, an upper eccentric portion correcting tool unit 63, and a lower eccentric portion correcting tool unit 64 are attached to a unit base 65 and integrated. . The main shaft portion correction tool unit 61 is the main shaft portion 51 which is the painted portion, the sub shaft portion correction tool unit 62 is the sub shaft portion 52 which is the painted portion, and the upper eccentric portion correction tool unit 63 is the painted portion. The upper eccentric portion 53 and the lower eccentric portion correcting tool unit 64 are for processing the lower eccentric portion 54, which is a portion to be painted, and have the same basic configuration. Therefore, the correction tool unit 63 for the upper eccentric portion will be described below as a representative example of the coating portion.

FIG. 5 is a front cross-sectional view of the upper eccentric portion correction tool unit 63 taken along line AA in FIG. The upper eccentric portion correction tool unit 63 is provided with a guide rail 71 . This guide rail 71 is attached to the aforementioned unit base 65 . A slide block 72 is attached to the surface opposite to the guide rail 71 attached to the unit base 65 so as to be movable along the guide rail 71 . A slide base 73 that moves integrally is attached to the slide block 72 . One end of a guide pin 74 is attached to the slide base 73 , and a correction tool base 75 is attached to the other end of the guide pin 74 via a linear bushing 76 . A compression spring 77 engaged with the slide base 73 and the correcting tool base 75 is arranged around the guide pin, and biases the correcting tool base 75 and the slide base 73 so that they are spaced at a constant distance. When the gap is narrowed, the compression spring 77 generates a spring reaction force.

A fall prevention bolt 79 is fixed to the correction tool base 75, and the fall prevention bolt 79 penetrates a correction tool 80 for processing the painted surface and is formed so as to prevent the correction tool 80 from falling off. The correction tool 80 is movably suspended along the drop prevention bolt 79 . A spherical washer 78 passes through the drop prevention bolt 79 and is arranged between the correction tool 80 and the correction tool base 75 .

The operation of the painted surface correcting tool unit 60 configured as described above when correcting the painted surface of the crankshaft 50 will be described using the upper eccentric portion correcting tool unit 63 as a representative example.
When the upper eccentric portion correcting tool unit 63 is lowered by the lifting device 40 , the correcting tool 80 comes into contact with the upper eccentric portion 53 of the crankshaft 50 .

Since the correction tool 80 is suspended by the drop prevention bolt 79, if the descent continues, the correction tool 80 follows the upper eccentric portion 53 and becomes parallel. As the descent continues, since the upper eccentric portion 53 is fixed, only the correction tool 80 moves upward along the fall prevention bolt 79, and the spherical washer 78 and the correction tool base 75 come into contact. As a result, the correction tool 80 follows the upper eccentric portion 53 and is pressed by the correction tool base 75 via the spherical washer 78 .

If it continues to descend from that state, the slide base 73 descends so that the guide pin 74 follows the linear bushing 76 while the correcting tool base 75 maintains its position. At this time, as shown in FIG. 6, a spring reaction force is generated by compressing a compression spring 77 arranged so as to be sandwiched between the correction tool base 75 and the slide base 73 . The upper eccentric portion correcting tool unit 63 is further lowered until this spring reaction force reaches a predetermined value. After the spring reaction force reaches a predetermined value, the crankshaft 50 is rotated by the rotary drive device 30 while the position of the upper eccentric portion correction tool unit 63 is held.

FIG. 7 is a front cross-sectional view when the crankshaft 50 is rotated while the upper eccentric portion correction tool unit 63 is pressed against the crankshaft 50 and the phase changes. When the crankshaft 50 rotates, the position of the central axis changes because the central axis of the upper eccentric portion 53 is not coaxial with the rotation axis. In accordance with the movement of the position of the central axis, the correction tool base 75 moves up and down along the guide pin 74 and the slide base 73 attached to the slide block 72 moves left and right along the guide rail 71 . Thus, the correction tool 80 follows the rotation of the crankshaft 50 while being pressed against the upper eccentric portion 53 by the spring reaction force of the compression spring 77 .

As described above, the upper eccentric portion correction tool unit 63 has described the configuration of the tool unit and the movement during correction machining. The main shaft correcting tool unit 61, the counter shaft correcting tool unit 62, and the lower eccentric correcting tool unit 64 may have the same configuration, but the main shaft correcting tool unit 61 and the counter shaft correcting tool Regarding the unit 62, if the rotation axis of the crankshaft 50 and the central axes of the main shaft portion 51 and the sub shaft portion 52, which are the machining portions of the respective tool units, are made to coincide with each other, the unit 62 can be driven during machining. Therefore, the guide rail 71 and the slide block 72 are unnecessary.

Further details of the correction tool 80 for correcting the painted surface of the crankshaft 50 will be described.
FIG. 8 is a front view of the correction tool 80. FIG. A large circle portion 82 and a small circle portion 83 are provided on a body 81 using a material such as tool steel that is much harder than the paint, and the large circle portion 82 and the small circle portion 83 form a convex coating surface. An edge portion 84 is formed for modifying or removing a portion. Although the small circular portion 83 is provided in the present embodiment, the groove does not have to be arc-shaped as long as the groove can form the edge portion 84 .

It also has a bolt through hole 85 through which the fall prevention bolt 79 passes. The large circle portion 82 has a diameter larger than the diameter of the upper eccentric portion 53 to be machined, and the small circle portion 83 has a diameter smaller than the diameter of the upper eccentric portion 53 and is provided parallel to the central axis of the large circle portion 82. It is By forming each portion with high precision, the edge portion 84 is also formed parallel to each central axis.

In the present embodiment, the surface of the large circle portion 82 is finished to a very smooth surface with a ten-point average roughness Rz of 1.0 μm or less. It is sufficient that the crankshaft 50 is not scratched when it is slid. For example, it is known that the slidability of the crankshaft 50 can be improved by providing a fine texture to the large circular portion 82, and there is no problem in exceeding Rz 1.0 μm by such processing.

The large circle portion 82 is finished after the small circle portion 83 is machined so that burrs on the edge portion 84 do not occur in the radial direction of the large circle portion 82 . Further, the length of the correction tool 80 formed with the large circle portion 82 and the small circle portion 83 in the depth direction of the paper surface is set longer than the axial length of the upper eccentric portion 53 .

FIG. 9 is a front cross-sectional view when the correction tool 80 according to Embodiment 1 is pressed against the upper eccentric portion 53. FIG. The diameter of the large circle portion 82 is larger than the diameter of the upper eccentric portion 53, which is the painted portion, and the small circular portion 83 is smaller than the diameter of the upper eccentric portion 53, which is the painted portion. is pressed against the upper eccentric portion 53, the edge portion 84 formed by the large circle portion 82 and the small circle portion 83 and the upper eccentric portion 53 are brought into close contact with each other. If the upper eccentric portion 53 has a convex portion 90 on the painted surface, it may occur that the edge portion 84 cannot be in close contact momentarily. , the edge portion 84 and the upper eccentric portion 53 are brought into close contact with each other as shown in FIG. 8 by rotating the crankshaft 50 .

When the crankshaft 50 is rotated from the state shown in FIG. 9, the convex portion 90 of the painted surface comes into contact with the edge portion 84 and is scraped off. The painted surface other than the convex portion 90 is not damaged because it comes into contact with the smoothly finished large circular portion 82 . In addition, since the large circular portion 82 and the upper eccentric portion 53 are in contact with each other in the concave and convex shapes, the stress at the contact portion is small, and the damage is less likely to occur.

Further, since the length of the correction tool 80 in the depth direction is set longer than the axial length of the upper eccentric portion 53, the entire coated surface of the upper eccentric portion 53 is corrected by rotating the crankshaft 50 one or more times. can do. The length of the correction tool 80 in the depth direction may be shorter than the axial length of the upper eccentric portion 53 as long as it is equal to or greater than the length of the portion requiring correction.

10A and 10B are photographs of the surface and cross-sectional shape before and after the painted surface of the crankshaft 50 is processed by the painted surface correcting device according to the first embodiment. The horizontal axis of the drawing showing the cross-sectional shape represents the dimensionless value of the axial length of the coated surface, and the vertical axis represents the dimensionless value of the coated surface height. As described above, it can be confirmed that the protrusions 90 can be removed efficiently and reliably without damaging the portions of the painted surface where there are no protrusions.

As described above, the correction tool 80 having a groove such as a circular arc larger than the diameter of the painted portion and a small circular portion parallel thereto and having a width smaller than the diameter of the painted portion mimics the crankshaft 50, which is the workpiece. Then, the crankshaft 50 is rotated while being driven so as to be driven, so that the projection 90 can be efficiently and surely removed without damaging the non-projection part of the coated surface of the crankshaft 50.例文帳に追加Here, it is desirable that the groove of the correction tool 80 is parallel to the circular arc, but even if it is not parallel, if the edge portion 84 can come into contact with the crankshaft 50, it is possible to remove the convex portion of the painted surface. .

Embodiment 2.
As in the first embodiment, a correction tool 80 having a large circular arc portion 82 that is an arc larger than the diameter of the painted portion and a small circular portion 83 that is parallel to the arc and has a width smaller than the diameter of the painted portion is used. The crankshaft 50, which is an object, is pressed so as to be driven while following the crankshaft 50, and the crankshaft 50 is rotated. In this case, as shown in FIG. 11, a tapered portion 86 that smoothly connects from the large circle portion 82 of the correction tool 80 to the end face portion 87 may be provided. With such a configuration, when the correction tool 80 is pressed against the crankshaft 50 , the correction tool 80 can follow the upper eccentric portion 53 along the tapered portion 86 . and the upper eccentric portion 53 can be prevented from being scratched.

Embodiment 3.
As in the first embodiment, a correction tool 80 having a large circular arc portion 82 that is larger than the diameter of the painted portion and a groove that is parallel to it and has a width smaller than the diameter of the painted portion is mounted on the crankshaft, which is the workpiece. The crankshaft 50 is rotated while following the 50 and pressed so as to be driven. In this case, the groove of the correction tool 80 may be formed like a rectangular portion 88 as shown in FIG. With such a configuration, the angle of the contact surface becomes a right angle when removing the convex portion 90 on the coated surface. This corresponds to setting the rake angle of a cutting tool to 0°, and can improve sharpness compared to grooves formed by the small circular portions 83, and can improve the removability of convex portions.

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1: rotary compressor, 2: rotor, 3: stator, 4: electric mechanism, 5: cylinder block, 6: rolling piston, 7: compression mechanism, 10: housing, 20: rotation support device, 30 : rotary drive device, 40: lifting device, 50: crankshaft, 51: main shaft portion, 52: sub shaft portion, 53: upper eccentric portion, 54: lower eccentric portion, 55: uncoated shaft portion, 56: upper center hole, 57: drive groove, 58: lower center hole, 60: painted surface correcting tool unit, 61: main shaft correcting tool unit, 62: sub shaft correcting tool unit, 63: upper eccentric correcting tool unit , 64: correction tool unit for lower eccentric portion, 65: unit base, 71: guide rail, 72: slide block, 73: slide base, 74: guide pin, 75: correction tool base, 76: linear bush, 77: Compression spring 78: spherical washer 79: fall prevention bolt 80: correction tool 81: body 82: large circle portion 83: small circle portion 84: edge portion 85: bolt through hole 86: tapered portion , 87: end surface portion, 88: rectangular portion, 90: convex portion, 100: coating surface correcting device.

Claims (11)

1. A correction tool is provided with a pressing mechanism that presses the correction tool while following the painted surface of the crankshaft, and the correction tool has an arc-shaped concave portion whose cross section perpendicular to the axis of the crankshaft is larger than the diameter of the painted portion. and a groove formed on the concave portion and having a width smaller than the diameter of the coating portion. A painted surface correction device characterized by removing a part.
2. 2. The painted surface correcting apparatus according to claim 1, further comprising rotational driving means for rotating the crankshaft, wherein the painted surface is moved by rotating the crankshaft with the rotational driving means.
3. The painted surface correcting device according to claim 2, wherein the correcting tool follows the rotation of the crankshaft while being pressed by the pressing mechanism.
4. The painted surface correcting device according to any one of claims 1 to 3, characterized in that the edge portion extends over the entire axial direction of the painted portion.
5. The painted surface correcting device according to any one of claims 1 to 4, characterized in that the groove is formed parallel to the axial direction together with the recess.
6. 6. The method according to any one of claims 1 to 5, wherein the pressing mechanism brings the recessed portion into contact with the painted surface and urges it with a predetermined reaction force of a spring to bring the edge portion into close contact with the painted surface. The painted surface correcting device according to any one of claims 1 to 3.
7. The painted surface correcting device according to any one of claims 1 to 6, wherein the surface of the recess has a ten-point average roughness Rz of 1.0 µm or less.
8. The painted surface correcting device according to any one of claims 1 to 7, characterized in that the end of the recess is tapered.
9. The painted surface correcting device according to any one of claims 1 to 8, wherein the groove has an arcuate cross section perpendicular to the axis of the crankshaft.
10. The painted surface correcting device according to any one of claims 1 to 8, characterized in that the groove has a rectangular cross section perpendicular to the axis of the crankshaft.
11. A method for manufacturing a rotary compressor, wherein the painted surface of a crankshaft of the rotary compressor is corrected using the painted surface correcting device according to any one of claims 1 to 10.

Images