JP7418664B2 - Painted surface correction device and rotary compressor manufacturing method - Google Patents

Description

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

Sliding parts, such as the crankshaft of a rotary compressor, are generally surface-treated to improve sliding properties. Some surface treatments involve forming a film by painting, and the painting process involves removing protrusions on the painted surface to prepare the painted surface. These protrusions are caused by dust in the painting environment, foreign matter in the paint liquid, and paint clumps. The presence of such a convex portion causes a decrease in sliding properties and assembly errors, resulting in a decrease in commercial value.

Sandpaper, a grindstone, or a tool such as that disclosed in Patent Document 1 is known as a tool for performing such correction work on a painted surface.

Patent No. 4676349

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

The present application was made in order to solve the above-mentioned problems, and provides a painted surface of a crankshaft from which convexities can be efficiently and reliably removed without damaging areas where the convexities are not present. The aim is to obtain a correction device.

The painted surface correction device disclosed in the present application includes a correction tool and a pressing mechanism that presses the correction tool while tracing the painted surface of the crankshaft, and the correction tool has a cross section perpendicular to the axis of the crankshaft that has a diameter of the painted area. It consists of an arc-shaped recess that is larger than the diameter of the painted surface, and a groove that is formed on the recess and has a width smaller than the diameter of the painted area.By moving the painted surface, the convex part of the painted surface can be removed using the recess and the groove. Features.

According to the painted surface repairing device disclosed in the present application, it is possible to efficiently and reliably remove the protrusions without damaging the parts of the painted surface of the crankshaft where there are no protrusions.

1 is a cross-sectional view of a rotary compressor equipped with a crankshaft, which is a workpiece of the painted surface correction apparatus according to the first embodiment. 1 is a schematic configuration diagram of a painted surface correction device according to Embodiment 1. FIG. It is a perspective view of the crankshaft which is a workpiece. FIG. 2 is a side view of the painted surface correction tool unit according to the first embodiment. 5 is a sectional view taken along line AA in FIG. 4. FIG. FIG. 3 is a front sectional view when the upper eccentric portion correction tool unit according to the first embodiment is pressed against the crankshaft. FIG. 3 is a front sectional view when the crankshaft is rotated and the phase changes with the upper eccentric portion correction tool unit according to the first embodiment being pressed against the crankshaft. 1 is a front sectional view of a correction tool according to Embodiment 1. FIG. FIG. 3 is a front sectional view when the correction tool according to the first embodiment is pressed against the upper eccentric part. FIG. 3 is a diagram showing surface photographs and cross-sectional shapes before and after processing a painted surface with the painted surface correction device according to the first embodiment. FIG. 7 is a front view of a correction tool according to a second embodiment. FIG. 7 is a front view of a correction tool according to Embodiment 3;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a painted surface correction device according to the present application will be described with reference to the drawings. Note that the same content and corresponding parts are designated by the same reference numerals, and detailed explanation thereof will be omitted. Similarly, in the following embodiments, redundant explanations will be omitted for the components denoted by the same reference numerals.

Embodiment 1.
FIG. 1 shows a rotary compressor 1 equipped with a crankshaft 50, which is a workpiece of a painted surface correction apparatus according to a first embodiment. The rotary compressor 1 is manufactured by arranging the crankshaft 50 whose painted surface has been modified as described later in the center. The operation of the rotary compressor 1 will be briefly explained. The crankshaft 50 is rotationally driven by an electric mechanism section 4 having a 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 part 53 and the lower eccentric part 54 of the crankshaft 50 rotate along the inner circumferential surface of the cylinder block 5. A vane (not shown) that slides in contact with the outer peripheral surface of the rolling piston 6 partitions the cylinder chamber in the cylinder block 5 into a suction chamber that sucks refrigerant and a compression chamber that compresses the refrigerant. The refrigerant is compressed by a compression mechanism section 7 composed of a cylinder block 5, a rolling piston 6, and a vane. Note that the number of rolling pistons 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 to improve sliding properties. A painted surface correction device 100 for correcting this painted surface will be explained.

FIG. 2 is a schematic configuration diagram of the painted surface correction apparatus 100 according to the first embodiment. The painted surface correction device 100 includes a rotation support device 20 that rotatably supports a crankshaft 50, which is a workpiece, and a rotation drive device 30 that rotationally drives the crankshaft 50. Further, a lifting device 40 that can be driven in a direction perpendicular to the axis of the crankshaft 50 is provided, the lifting device 40 is fixed to the housing 10, and the painted surface of the crankshaft 50 is attached to the tip of the lifting device. A painted surface correction tool unit 60 for correction is attached.

The painted surface correction tool unit 60 is pressed against the crankshaft 50 by driving the lifting device 40, and the painted surface of the crankshaft 50 is corrected by rotating the crankshaft 50 by the rotary drive device 30.

FIG. 3 is a perspective view of a crankshaft 50, which is a workpiece. The crankshaft 50 includes a main shaft portion 51, a countershaft portion 52, a non-painted shaft portion 55 provided coaxially, an upper eccentric portion 53 and a lower eccentric portion provided on a different axis parallel to the axis of the crankshaft 50. Consists of 54. The main shaft part 51, the counter shaft part 52, the upper eccentric part 53, and the lower eccentric part 54 are parts that slide on other parts, so they are coated to improve sliding properties. If there are protrusions on these surfaces, it will affect the assembly accuracy and adversely affect the slidability, so correction processing to remove the protrusions is required.

Further, an upper center hole 56 and a lower center hole 58 are formed at both ends of the crankshaft 50 for use in machining and for supplying oil. Further, a drive groove 57 is formed on the outer side of the upper center hole 56. By engaging the rotation drive device 30 using the upper center hole 56 and engaging the rotation support device 20 using the lower center hole 58, the crankshaft 50 is supported from both sides, and the drive groove 57 is rotated. The crankshaft 50 is configured to be rotated by being attached to the drive section of the drive device 30.

However, the shape of the workpiece is not limited to the above-mentioned shape. For example, if the non-painted shaft portion 55 is gripped and rotated, it is also applicable to a shape that does not have the upper center hole 56 and the drive groove 57. Further, even in the case where the lower center hole 58 is not provided, the outer diameter portion of the subshaft portion 52 may be rotatably supported by a roller or the like.

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

FIG. 5 is a front cross-sectional view taken along the line AA in FIG. 4 of the upper eccentric portion correction tool unit 63. The upper eccentric portion correction tool unit 63 is equipped with a guide rail 71. This guide rail 71 is attached to the unit base 65 described above. A slide block 72 is attached to the opposite surface of 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 with the slide block 72 is attached. 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 bush 76. A compression spring 77 that is engaged with the slide base 73 and the correction tool base 75 is arranged around the guide pin, and is biased so that the correction tool base 75 and the slide base 73 are spaced apart from each other at a constant distance. When the distance is narrower than the distance, a spring reaction force is generated in the compression spring 77.

A fall prevention bolt 79 is fixed to the correction tool base 75, and the fall prevention bolt 79 is formed to penetrate a correction tool 80 for processing a painted surface and to prevent the correction tool 80 from falling out. The correction tool 80 is movably suspended along the fall prevention bolt 79. A spherical washer 78 passes through the fall prevention bolt 79 and is disposed between the modification tool 80 and the modification tool base 75.

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

Since the correction tool 80 is suspended by the fall prevention bolt 79, if it continues to descend, the correction tool 80 will follow the upper eccentric portion 53 and become 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 with each other. As a result, the correction tool 80 is pressed by the correction tool base 75 via the spherical washer 78 while following the upper eccentric portion 53 .

When the slide base 73 continues to descend from this state, the guide pin 74 follows the linear bush 76 while the correction tool base 75 maintains its position, and the slide base 73 descends. At this time, as shown in FIG. 6, the compression spring 77 disposed between the correction tool base 75 and the slide base 73 is compressed, thereby generating a spring reaction force. The upper eccentric portion correction 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 rotation drive device 30 rotates the crankshaft 50 while maintaining the position of the upper eccentric portion correction tool unit 63.

FIG. 7 is a front sectional view when the crankshaft 50 is rotated and the phase changes with the upper eccentric portion correction tool unit 63 being pressed against the crankshaft 50. When the crankshaft 50 rotates, the central axis of the upper eccentric portion 53 is not coaxial with the rotation axis, so the position of the central axis changes. In accordance with the movement of the central axis position, 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. In this manner, the correction tool 80 is driven in accordance with 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 mentioned above, the structure of the tool unit and the movement during correction machining of the upper eccentric portion correction tool unit 63 have been described. The main shaft part correction tool unit 61, the subshaft part correction tool unit 62, and the lower eccentric part correction tool unit 64 may have the same configuration, but the main shaft part correction tool unit 61 and the subshaft part correction tool If the unit 62 is made with high precision so that the axis of rotation of the crankshaft 50 and the center axes of the main shaft portion 51 and sub-shaft portion 52, which are the machining parts of each tool unit, coincide, the driven Since there is no need to do so, the guide rail 71 and slide block 72 are unnecessary.

The repair tool 80 for repairing the painted surface of the crankshaft 50 will be described in further detail.
FIG. 8 is a front view of the correction tool 80. A large circular part 82 and a small circular part 83 are provided on the body 81, which is made of a material much harder than paint, such as tool steel. An edge portion 84 is formed for modifying or removing the portion. Although the small circular portion 83 is provided in this embodiment, the groove does not need to be arcuate as long as the edge portion 84 can be formed therein.

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

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

After processing the small circular portion 83, the large circular portion 82 is finished to prevent burrs from forming on the edge portion 84 in the radial direction of the large circular portion 82. Further, the length of the correction tool 80 in the depth direction of the paper plane, in which the large circular portion 82 and the small circular portion 83 are formed, is set to be longer than the length of the upper eccentric portion 53 in the axial direction.

FIG. 9 is a front sectional view when the correction tool 80 according to the first embodiment is pressed against the upper eccentric part 53. The diameter of the large circular part 82 is larger than the diameter of the upper eccentric part 53 which is the painted part, and the small circular part 83 is formed smaller than the diameter of the upper eccentric part 53 which is the painted part, so the correction tool 80 When pressed against the upper eccentric part 53, the edge part 84 formed by the large circular part 82 and the small circular part 83 and the upper eccentric part 53 are brought into close contact. If there is a convex part 90 on the painted surface on the upper eccentric part 53, it may happen that the edge part 84 is not able to make close contact for a moment. If the width is larger than the width of the upper eccentric part 53, by rotating the crankshaft 50, the edge part 84 and the upper eccentric part 53 will be in close contact with each other as shown in FIG.

When the crankshaft 50 is rotated from the state shown in FIG. 9, the convex portion 90 on the painted surface comes into contact with the edge portion 84 and is scraped off. Since the painted surface other than the convex portion 90 comes into contact with the smoothly finished large circular portion 82, no scratches or the like will occur. Further, since the large circular portion 82 and the upper eccentric portion 53 are in contact with each other in the shape of a concave portion and a convex portion, the stress at the contact portion is small and there is an effect that scratches and the like are less likely to occur.

In addition, since the length of the correction tool 80 in the depth direction is set longer than the length of the upper eccentric part 53 in the axial direction, the entire painted surface of the upper eccentric part 53 can be corrected by rotating the crankshaft 50 once or more. can do. Note that the length of the correction tool 80 in the depth direction may be shorter than the length of the upper eccentric portion 53 in the axial direction as long as it is longer than the length of the part that requires correction.

FIG. 10 is a diagram showing surface photographs and cross-sectional shapes before and after processing the painted surface of the crankshaft 50 with the painted surface repairing device according to the first embodiment. In the figure showing the cross-sectional shape, the horizontal axis represents a dimensionless value of the axial length of the painted surface, and the vertical axis represents the dimensionless value of the height of the painted surface. As described above, it can be confirmed that the protrusions 90 can be efficiently and reliably removed without damaging the parts 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 area and a small circular part parallel to the arc and smaller in width than the diameter of the painted area is imitated on the crankshaft 50 that is the workpiece. By rotating the crankshaft 50, the convex part 90 can be efficiently and reliably removed without damaging the parts of the painted surface of the crankshaft 50 where the convex part is not present. Here, it is desirable that the groove of the correction tool 80 be parallel to the arc, but even if it is not parallel, it is possible to remove the convex part on the painted surface as long as the edge part 84 can come into contact with the crankshaft 50. .

Embodiment 2.
Similar to the first embodiment, a repair tool 80 having a large circular arc portion 82 that is an arc larger than the diameter of the painted area and a small circular portion 83 that is a groove that is parallel to the large circular arc and has a width smaller than the diameter of the painted area is used to machine the workpiece. While following the object crankshaft 50, it is pressed so as to be followable, and the crankshaft 50 is rotated. In this case, as shown in FIG. 11, a tapered portion 86 may be provided that smoothly connects the large circular portion 82 to the end surface portion 87 of the correction tool 80. With this configuration, when pressing the correction tool 80 against the crankshaft 50, the correction tool 80 can follow the upper eccentric part 53 along the tapered part 86, so that the end face part 87 It is possible to prevent scratches from occurring due to contact between the upper eccentric portion 53 and the upper eccentric portion 53.

Embodiment 3.
Similar to Embodiment 1, a repair tool 80 having a large circular arc portion 82 that is a larger arc than the diameter of the painted area and a groove parallel to the large circular part 82 and having a width smaller than the diameter of the painted area is attached to a crankshaft that is a workpiece. The crankshaft 50 is rotated by pressing the crankshaft 50 in a followable manner while following the direction of the crankshaft 50. 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 surface that comes into contact when removing the convex portion 90 on the painted surface becomes a right angle. This corresponds to setting the rake angle to 0° in a cutting tool, and the cutting quality can be improved compared to the groove formed by the small circular portion 83, and the removability of the convex portion can be improved.

Although this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may be applicable to a particular embodiment. The present invention is not limited to, and can be applied to the embodiments alone or in various combinations.
Accordingly, countless variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, this includes cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of other embodiments.

1: Rotary compressor, 2: Rotor, 3: Stator, 4: Electric mechanism section, 5: Cylinder block, 6: Rolling piston, 7: Compression mechanism section, 10: Housing, 20: Rotation support device, 30 : Rotation drive device, 40: Lifting device, 50: Crankshaft, 51: Main shaft portion, 52: Subshaft portion, 53: Upper eccentric portion, 54: Lower eccentric portion, 55: Non-painted shaft portion, 56: Upper center Hole, 57: Drive groove, 58: Lower center hole, 60: Painted surface correction tool unit, 61: Main shaft correction tool unit, 62: Subshaft correction tool unit, 63: Upper eccentric correction tool unit , 64: Lower eccentric part correction tool unit, 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 circular part, 83: Small circular part, 84: Edge part, 85: Bolt through hole, 86: Tapered part , 87: End face portion, 88: Rectangular portion, 90: Convex portion, 100: Painted surface correction device.

Claims (12)

A correction tool includes a pressing mechanism that presses the correction tool while following the painted surface of the crankshaft, and the correction tool has an arc-shaped recess whose cross section perpendicular to the axis of the crankshaft is larger than the diameter of the painted area. It is characterized by comprising a groove formed on the recess and having a width smaller than the diameter of the painted area, and by moving the painted surface, the convex part of the painted surface is removed by the recess and the groove. A painted surface correction device. 2. The painted surface repairing apparatus according to claim 1, further comprising a rotation drive means for rotating the crankshaft, and moving the painted surface by rotating the crankshaft with the rotation drive means. 3. The painted surface repairing device according to claim 2, wherein the repairing tool is driven in accordance with the rotation of the crankshaft while being pressed by the pressing mechanism. The painted surface repairing device according to any one of claims 1 to 3, wherein the groove is formed parallel to the axial direction together with the recess. The painted surface repairing device according to any one of claims 1 to 4, wherein the surface of the recess has a ten-point average roughness Rz of 1.0 μm or less. The painted surface correction device according to any one of claims 1 to 5, wherein an end portion of the recessed portion is formed in a tapered shape. The painted surface repairing device according to any one of claims 1 to 6, wherein the groove has an arcuate cross section perpendicular to the axis of the crankshaft. The painted surface repairing device according to any one of claims 1 to 6 , wherein the groove has a rectangular cross section perpendicular to the axis of the crankshaft. The painted surface repair device according to any one of claims 1 to 8, wherein the convex portion of the painted surface is removed by an edge portion formed at a boundary between the recessed portion and the groove portion of the repair tool. . The painted surface correction device according to claim 9, wherein the edge portion extends over the entire axial direction of the painted area. According to claim 9 or 10, the pressing mechanism brings the edge portion into close contact with the painted surface by bringing the recess into contact with the painted surface and biasing it with a predetermined reaction force of a spring. Painted surface correction device described. A method for manufacturing a rotary compressor, comprising correcting a painted surface of a crankshaft of a rotary compressor using the painted surface modifying device according to any one of claims 1 to 11.

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