JP2000220588A - Manufacturing method and device for rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture an aluminum alloy rotor reduced in material costs and the number of manufacturing processes. SOLUTION: The container 9a of the metallic molds 9 and 10 of a press device houses a base material 12 for the aluminum alloy rotor of a rotary compressor or the like. A pressure punch 5 attached to a pressure mechanism is disposed directly above the container 9a. The pressure punch 5 is provided with a shaft hole punch 5a for forming the shaft hole of the rotor, and a vane punch 5b for forming the vane groove of the vane housing part of the rotor. The pressure punch 5 is used to form parts of the vane groove and the shaft hole of the rotor on the base material by forging and, when a thickness is formed to punch out the remaining thick part of the base material 12, the thick part is punched out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotor such as a rotary compressor or a pump and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art In order to reduce the size and improve the efficiency of compressors, rotary compressors are on the market. In a rotary compressor, a plurality of vane grooves are formed in a rotor eccentrically mounted in a cylinder hole, and plate-like vanes arranged in each vane groove are formed on a cylinder inner wall by centrifugal force and oil pressure due to rotation of the rotor. When the vane is pushed up and the tip of the vane slides along the inner wall, the vane protrudes from the vane groove, and the storage is alternately repeated to perform gas suction compression.

FIG. 9 shows a mold (die) 5 for forming a conventional rotor of a compressor by forging.
1 is shown. The mold 51 is provided with a forming hole 52 for forming a material (blank) made of an aluminum alloy (not shown) therein, and a plurality of blade-shaped vane groove forming portions 55 are formed from the inner wall surface 54 of the forming hole 52. It protrudes inward. After the material is placed on the upper part of the mold 51 by such a mold 51, the material is placed in a molding hole 5 by a pressure punch (not shown).
2 is formed. FIG. 10 shows the completed rotor precursor 56 after being molded in the mold 51. As shown in the drawing, the rotor precursor 56 after molding has, in addition to a rotor portion 57 serving as a product portion, a surplus portion 58 serving as a discarded portion.
It is included. The rotor precursor 56 becomes a completed rotor 59 by cutting the excess thickness portion 58 and drilling the shaft hole 60. Note that reference numeral 61 in the drawing indicates a vane groove.

[0004]

As described above, the aluminum alloy rotor is manufactured by forging.
According to the forging, a surplus portion is generated, which causes an increase in material cost, thereby increasing the manufacturing cost. In addition, when a rotor is manufactured, if a forging process and a cutting process are included, these processes are different, and it takes time and effort. Furthermore, in a forged product, the corner 62 of the product is rounded, and it is difficult to form the product into a shape with a sharp tip. In order to eliminate the excess thickness, a method of pressing and shaping the vane groove and the shaft hole of the rotor is considered. However, in order to punch a vane groove or the like of the rotor, the axial length of the rotor is, for example, about 40 mm depending on the type of the product, and cannot be punched by the conventional press punching technique. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a rotor manufacturing method and a manufacturing apparatus for manufacturing a rotor such as a rotary compressor, which reduces the number of manufacturing steps without producing extra thickness unlike forging. The purpose is to do.

[0005]

In order to achieve the above object, a method of manufacturing a rotor according to the present invention is directed to a rotor having a vane groove extending axially through a rotor disposed eccentrically in a cylinder hole. In the manufacturing method, the material of the rotor is housed in a mold for molding the rotor, and a pressure punch having substantially the same cross-sectional shape as the vane groove is used, and a part of the vane groove is formed in the material by forging. When the pressure punch punched through the remaining flesh of the vane groove, the flesh was punched out with the pressure punch.

According to another aspect of the present invention, there is provided an apparatus for manufacturing a rotor, comprising: an aluminum alloy rotor disposed eccentrically in a cylinder hole; In the manufacturing apparatus, a mold for storing and molding the material of the rotor in advance and a pressure punch having substantially the same cross-sectional shape as the vane groove are provided, and a part of the vane groove is formed in the material by forging. Was formed, and when the thickness of the remaining meat portion of the vane groove was such that the pressure punch could punch through the meat portion, the meat portion was punched out by the pressure punch.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of manufacturing a rotor and an apparatus for manufacturing the rotor according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the press device 1, in which the left side (A) shows the top dead center of the non-operating state of the press device 1 and the right side (B) shows the bottom dead center of the pressurized state. As shown in the figure, a pressing device 1 mainly includes a pressing mechanism 2 disposed at an upper part, a mold part 3 disposed at a lower part, and a pressure stripper 4.
Consists of The pressing mechanism 2 is provided with a pressing punch 5 and a vane holding portion 6 for holding the pressing punch 5 in the center. As shown in FIG. 2, the pressing punch 5 includes a cylindrical shaft hole punch 5a for forming a shaft hole of a rotor, and a vane-shaped vane punch 5b for forming a vane groove.
As shown in the horizontal section, five pieces are arranged around the shaft hole punch 5a at equal intervals. Vane punch 5b
A guide rail 5c having a length protruding outward from the outer peripheral portion of the rotor 7 to be formed as indicated by an imaginary line and having a circular cross section is formed at the end thereof. The operation of the guide rail 5c will be described later.

As shown in FIG. 1, a die 3 is provided on a base 8 of the press device 1. Mold part 3 is made of material 1
Upper mold 9 for housing 2 and lower mold 1 disposed below the upper mold 9
The upper die 9 is provided with a cylindrical container 9a penetrating at the center thereof, and a raw material 12 for the rotor is accommodated therein. FIG. 4 shows a horizontal cross section of the upper mold 9. Upper mold 9
Has a circular cross section, and a guide groove 9b is formed at a position corresponding to the guide rail 5c when the pressure punch 5 is lowered on the periphery of the container 9a. Guide rail 5c of vane punch 5b
Are fitted.

FIG. 5 shows a horizontal cross section of the lower mold 10. In the lower mold 10, at a position corresponding to the pressure punch 5,
Through holes 10a and 10b for inserting the shaft hole punch 5a and the vane punch 5b are formed. Through holes 10a, 10
The shape of b is substantially equal to the cross-sectional shape of the shaft hole punch 5a and the vane punch 5b. The length up to the lower end of the pressing punch 5 is such that the pressing mechanism 2 passes through the container 9a of the upper mold 9 and projects from the lower ends of the through holes 10a and 10b in a state where the pressing mechanism 2 is at the position of the bottom dead center. It is length.

As shown in FIG. 1, the pressurizing mechanism 2 is provided with a pressing member 15 which moves up and down in a cylindrical portion 14 of the cylinder. It is in the lower position as shown in FIG. Pressing member 15
The pressure stripper 4 is disposed at a lower portion of the guide rod 17 and the guide rod 17 fixed to the base 8.
Can be moved up and down. When the press device 1 is not operated, the pressure stripper 4 is urged upward. As shown in FIG. 2, the pressure stripper 4 is provided with a holding portion 16 for the material 12 corresponding to the pressure punch 5.

The holding portion 16 projects below the reference surface of the pressure stripper 4 so that it can be inserted into the container 9a of the upper mold 9, and is brought into contact with the upper surface of the material 12 to apply a pressing force. The material 12 can be fixed to the container 9a. The holding portion 16 is provided with punch holes 16a and 16b through which the shaft hole punch 5a and the vane punch 5b penetrate. The shape of the punch holes 16a and 16b is preferably such that the gap between the shaft hole punch 5a and the vane punch 5b is as small as possible in order to improve accuracy. In addition, the pressurizing method of the pressurizing mechanism 2 can use a known means such as a hydraulic pressure, and thus the description is omitted.

Next, the operation of the press device 1 will be described. After the material 12 is stored in the container 9a of the upper mold 9, the pressing mechanism 2 is lowered from the non-operating state of the press device 1 (see FIG. 1A). At this time, the pressing member 15
Is, for example, by a pressurized fluid introduced into the cylinder,
It is biased downward. When the pressing member 15 comes into contact with the pressure stripper 4, the downward biasing force of the pressing member 15 is set to be greater than the upward biasing force of the pressure stripper 4. When pressed, the guide rod 17 slides downward, and its holding portion 1
6 comes into contact with the upper surface of the material 12. At this point, the pressure stripper 4 is at the lowermost position. Even if the pressure stripper 4 is pressed by the pressing member 15, only the pressing force on the material 12 increases.

Since the downward biasing force of the pressing member 15 is smaller than the pressing force of the pressing mechanism 2, when the pressing mechanism 2 further presses, as shown in FIG. The pressing member 15 slides upward on the cylindrical portion 14 of the pressing mechanism 2 while pressing the pressing stripper 4. That is, the pressing member 1
The height position of 5 is maintained as it is, and only the pressing mechanism 2 is lowered. Further, when the pressing mechanism 2 descends, the pressing punch 5
The lower end of the abutment comes into contact with the material 12 to perform punching. FIG.
Indicates a material 12 made of an aluminum alloy. In the present embodiment, the dimensions of the cylindrical material 12 are a height H36 mm,
The diameter D is 44.5 mm. On the other hand, the upper mold 9 shown in FIG.
Has an inner diameter of 45.2 mm. The chemical composition of the aluminum alloy is 15.8% by weight of Si-0.21% by weight of Fe-4.2 in addition to aluminum.
Wt% Cu-0.02 wt% Mn-0.5 wt% Mg-
0.01% by weight of Zn-0.03% by weight of Ti is included, and each component error is within ± 0.05% by weight.

In the punching operation, first, the aluminum alloy material 12 is heated to 400 to 470 ° C. to soften the material. The heating temperature changes according to the composition of the material 12. The heating method does not matter. Then, graphite lubricant is sprayed on the upper mold 9 and the lower mold 10, and the raw material 12 is charged at random without positioning in the container 9 a. This is because the difference between the diameter of the material 12 and the hole diameter of the container 9a is small, so that the centering can be performed within an error range without centering. The blank 12 is first forged by the pressure punch 5. As shown in FIG. 7, the shaft hole 18a and the vane groove 18b
When forging is completed to about 2/3 of the height of the material 12, the forging is terminated, and 1/3 of the remaining meat portion is punched out with a pressure punch 5 at a stretch. That is, forging is performed to form a vane groove and a shaft hole by a predetermined length, and when the remaining meat portion has a thickness that can be punched out by press punching, press punching is performed. Is molded. The remaining meat falls into the lower die holder 11.

Since the rotor 18 is fixed by the pressure stripper 4, even if the rotor 18 adheres to the pressure punch 5 after the work is completed, the rotor 18 is separated by raising the pressure punch 5. When removing the rotor 18, the pressurizing mechanism 2 and the pressurizing stripper 4 are lifted and taken out of the container 9a. The dimension of the completed rotor 18 is such that the height h shown in FIG.
Longer, the diameter d is 45 mm, 0.5
mm. The reason why the diameter d of the rotor 18 is smaller than the inner diameter of the mold by 0.2 mm is that heat shrinks.

As described above, in the present embodiment,
In the blanking step of the blank 12, the blank 12 is fixed by the holding section 16 of the pressure stripper 4. As shown in FIGS. 3 and 4, a guide rail 5c is provided on the outer side of the vane punch 5b, and the guide rail 5c is fitted into the guide groove 9b of the upper die 9, and the punch hole 16 of the pressure stripper 4 is formed.
a, 16b and the pressure punch 5, the gap between the shaft hole punch 5a and the vane punch 5 is reduced.
It is possible to perform accurate punching without bending or shifting b. The corners tend to be rounded by ordinary forging, and it is difficult to form a fine shape having an acute angle. However, according to the present method, it is possible to form more finely than forging.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications and changes can be made based on the technical concept of the present invention. For example, in the above-described embodiment, the punching is performed by heating the aluminum alloy material to 400 to 470 ° C. However, if the material is a soft material, the heat treatment can be omitted.

[0018]

According to the method and the apparatus for manufacturing an aluminum alloy rotor of the present invention, the rotor formed by stamping out the material does not have a surplus portion, and the labor for cutting the rotor can be saved. In addition, material cost can be saved because no excess portion is formed. By providing a guide rail on the pressurizing punch and providing a guide groove on the mold, the punch can be prevented from bending during the punching operation, and a highly accurate rotor can be formed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a press device for performing a method of manufacturing an aluminum alloy rotor according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a punch portion and a mold portion of the press device of FIG.

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a sectional view taken along line YY in FIG. 2;

FIG. 5 is a sectional view taken along line ZZ in FIG. 2;

FIG. 6 is a perspective view of a material processed by the press device of FIG. 1;

FIG. 7 is a perspective view of a material in a state where it is forged by the press device of FIG. 1;

8 is a perspective view of a completed rotor product from which vane grooves have been punched out by the press device of FIG. 1;

FIG. 9 is a perspective view of a mold used for forming a rotor in a conventional forging method.

FIG. 10 is a perspective view of a rotor precursor forged by the mold of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press apparatus 2 Pressure mechanism 4 Pressure stripper 5 Pressure punch 5a Shaft hole punch 5b Vane punch 5c Guide rail 7 Rotor 9 Upper die 9a Container 9b Guide groove 10 Lower die 12 Material 15 Pressing member 16 Holding part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H040 AA01 AA07 BB01 BB11 CC16 DD07 DD08 DD35 DD36 4E087 AA08 AA10 BA04 BA15 BA20 CA14 CA17 CA33 CB01 DB05 DB15 DB23 EC12 EC22 EC37 EC46 ED33 EE02 GA02 HA11 HA35

Claims (5)

[Claims] 1. A method of manufacturing a rotor, wherein a vane groove penetrating through the rotor is provided in an axial direction of the rotor, wherein a material for the rotor is housed in a mold for molding the rotor, and has substantially the same sectional shape as the vane groove. A part of a vane groove is formed in said material by forging using said pressure punch, and a remaining meat portion of said vane groove is punched out by said pressure punch. 2. The method for manufacturing a rotor according to claim 1, wherein the material is an aluminum alloy, and the material is heated and then housed in a housing of the mold. 3. A rotor manufacturing apparatus provided with a vane groove penetrating the aluminum alloy rotor in the axial direction of the rotor, wherein a die for storing and molding the material of the rotor in advance, and the vane groove is substantially formed. A pressure punch having the same cross-sectional shape is provided on the material, and a part of the vane groove is formed in the material by forging, and when the pressure punch has a thickness capable of punching out,
An apparatus for manufacturing a rotor, wherein a remaining meat portion of a vane groove is punched by a pressure punch. 4. The apparatus for manufacturing a rotor according to claim 3, wherein a fixing member for fixing the material is provided in the housing portion of the mold. 5. A mold, wherein a guide portion for preventing displacement of the press punch is provided outside the press punch, and a guide groove to be fitted in the guide portion is provided in the mold. Item 4. An apparatus for manufacturing a rotor according to Item 3.