JPS6068121A - Production of rotor - Google Patents

Abstract

PURPOSE:To supply inexpensively rotors in large amt. by blanking a plate- shaped blank material having sectorial vane sliding grooves and working plastically the blanked material to have the prescribed width of the sliding grooves then laminating the blank materials and forming the rotor. CONSTITUTION:An elliptical plate-shaped blank material 16 having vane sliding parts 17 widened to a sectorial shape in the open parts is blanked by pressing and thereafter an irregular shaped blank material 16' is plastically worked by using dies 18, 19 having semicircular sections to form a rotor blank material 23 having a prescribed outside diameter 20, a shaft hole 21 and vane sliding grooves 22. Plural sheets of the materials 23 are superposed to attain a prescribed rotor length and the joint surfaces of the materials 23 are joined by a brazing filler metal. The inexpensive supply of a large amt. of the rotors having the vane sliding grooves is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a rotor for a rotary compressor.

Conventional Structure and Problems In general, a sliding vane type rotary compressor, as shown in Fig. 1, has a cylinder 1 having a cylindrical space inside, and a vane chamber fixed to both end faces of the cylinder 1, which is the internal space of the cylinder 1. A rotor 3 and a shaft 4 which rotate around a center α which is eccentric to the center O in the cylinder 1, and a rotor 3 and a shaft 4, which are provided in the rotor 3. It is composed of a plate 76 that is slidably engaged with the vane sliding groove 5. Note that 7 is a suction hole formed in the outer wall surface of the inner cylinder, and 8 is a discharge hole also formed in the cylinder 1. The vanes 6 fly outward due to centrifugal force as the rotor 3 rotates,
Its tip slides on the inner wall of the cylinder, repeatedly sucking in, compressing, and discharging gas.

This kind of sliding vane rotary compressor is smaller, lighter, and simpler to construct than a reciprocating compressor, which has a complex configuration and a large number of parts, and has recently been applied to compressors for car coolers. It became so.

However, when we examine each of the components of the rotary compressor from the viewpoint of manufacturing technology, we find that there are many problems in the manufacturing method,9 and therefore, it is difficult to make the components sufficiently compact, lightweight, and simple. It is hoped that the manufacturing cost will be significantly reduced by developing a manufacturing method that is suitable for mass production.
Among the many compressor component parts currently available, the rotor and rotor shaft (rotor and shaft combined) require particularly high machining accuracy and mechanical strength. Furthermore, at present, one of the most expensive items to manufacture is the rotor and rotor shaft. Therefore, the manufacturing departments of various companies have been actively developing manufacturing methods that make rotors and rotor shafts lighter, simpler in structure, and more easily mass-produced, but the problems have not yet been satisfactorily solved.

Next, a conventional method for manufacturing a rotor and rotor shaft will be explained with reference to FIGS. 2 to 1o. FIG. 2 is a diagram of the manufacturing process, and FIGS. 3 to 10 are manufacturing process diagrams. First, a round bar material 10 made of a predetermined material is cut to a certain size (FIG. 3), and a center hole 12 is formed in the cut material 11 using a drilling machine (FIG. 4). Next, the center hole 12
Figure 6). Next, drill relief holes 13a and 13b on both sides of the center hole 12 (fc&cm 7), machine the vane sliding grooves 14a and 14b (see fig. 8), and further machine the shaft 15 separately from this rotor 11 (Fig. (Fig. 9) are combined using a baking method (Fig. 10), and after being integrally joined, the rotor shaft is finished by polishing with a grindstone to form a finished rotor shaft.

Generally, the vane sliding groove is machined by plunge cutting with a metal saw formed to a predetermined blade thickness. It is difficult to obtain high machining accuracy because the metal saw bends during machining, the sharpness decreases, etc., and the machining time is long and the blade wears out rapidly, so it is not suitable for mass production, and the manufacturing price is low. is a major factor in the high cost.

In addition, there are examples in which the vane sliding groove is processed by broaching, but this method can also be said to be inappropriate for mass production due to the wear and tear of the blades and the number of processing steps. In any case, forming a vane sliding groove with such a shape by cutting requires many machining steps as explained above, and the machining process itself is necessarily a batch processing method. In addition, there are many problems in terms of cutting technology in order to maintain the machining accuracy, so this manufacturing method is extremely inappropriate in terms of mass production technology.

OBJECTS OF THE INVENTION The present invention aims to improve the drawbacks of the conventional manufacturing methods described above, provide a manufacturing method with high mass productivity, and supply rotors in large quantities.

Structure of the Invention The present invention produces a plate-shaped material having a rotor shaft hole and a fan-shaped vane sliding groove that can be easily punched out by press punching, and by molding with this plate-shaped material, a predetermined vane sliding can be achieved. The present invention provides a rotor manufacturing method for obtaining a rotor having a dynamic groove shape, and can greatly simplify the rotor manufacturing method and realize a method that is suitable for mass production.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 11 to 17.

Figure 11 shows a plate-shaped rotor divided into multiple parts in the longitudinal direction.
It is an irregularly shaped material 16 having a roughly elliptical shape in which the vane sliding groove is expanded into a fan shape. This irregularly shaped material 16 can be mass-produced in a short time by press punching from a plate material. Generally, press punching is a method for manufacturing plate-shaped parts in large quantities, but if the die itself has a cross-sectional shape with thin protrusions, excessive force is applied to these thin protrusions, causing wear and tear on the protrusions.・This may cause breakage, etc., and damage the shape of the workpiece. However, by using the fan-shaped vane sliding groove 17 with a widened opening as in the present invention, there are no thin protrusions on the mold itself, and this can be avoided. In other words, since the workpiece has a shape that does not have a narrow space, press punching can be easily performed, and the life of the mold can be maintained without increasing.

Next, as shown in FIG. 12, the irregular shaped material 16' is press-molded from the outer periphery toward the center as indicated by the arrows using two molds 18 and 19 having semicircular portions of a predetermined circular shape. FIG. 13 shows a shaft hole 21 with an outer diameter of 20° formed into a predetermined shape by punching and forming the bushings as described above. This is a rotor material 23 that forms a vane sliding groove 22.

As shown in FIG. 14, several pieces of the rotor material 23 manufactured in this manner are stacked and bonded so as to have a predetermined rotor length t. To explain an example of this joining method, the rotor material 2
3, a previously prepared copper-based wax phase (not shown) is inserted into the shaft hole 21 and the vane sliding groove 22 using a jig.
, and heated in a heating furnace to 1100° C. for about 1 hour, followed by heating to 1000° C. for about 2 hours as a diffusion treatment step. As a result, each piece of the rotor material 23 is integrally joined by melting and diffusing the brazing material.

In the above-mentioned integral joining process, a copper-based brazing material may be sandwiched between each piece in advance, or the brazing material may be placed on the outer peripheral surface of the joint, a so-called "place" method. In other words, copper melts when heated to a high temperature, penetrates into the gaps between each piece due to surface tension and capillary action, and diffuses into the inside of each piece in the next diffusion process to firmly bond them together. .

The above process described an example in which only the rotor material is integrally joined, but as shown in FIG. 15, the rotor material 23 and the shaft 24 are
It is also possible to integrally join them at the same time, and separate installation is not a problem. The rotor shaft that has been integrally joined in this way is finished by polishing with abrasive grains in the next step, but the material for the rotor material 23 is one that is easy to press punch or press form, and has excellent wear resistance. Therefore, the material is a soft ductile steel plate such as general structural rolled steel, and after the forming process and the joining process, heat treatment such as carburizing and quenching is performed to improve wear resistance. can be obtained.

Although the above embodiment describes a method for manufacturing a rotor shaft having two vane sliding grooves on the rotor, as shown in FIG.
3' can also be manufactured in the same manner as described above. In addition, although the above embodiment describes an example in which several pieces of rotor material are stacked and integrally joined, as shown in Fig. 1γ, the rotor length t can be sufficiently accommodated by the thickness of one piece of rotor material 23. If the length is long enough, the above-mentioned laminated joining is unnecessary, and it is possible to obtain the rotor shaft i by joining one rotor material 23 to the shaft 24'.

Effects of the Invention As described above, the present invention is an extremely rational and mass-producible method of manufacturing a rotor by stacking individual pieces punched out in a layered manner. Furthermore, since the cross-sectional shape of the workpiece when press punching the material is such that there is no constriction, the punching process can be easily performed without applying excessive force to the punching die. This is an extremely economical manufacturing method that also extends the life of the mold.

[Brief explanation of the drawing]

Figure 1 is a partial front cross-sectional view of a two-sliding vane rotary compressor, Figure 2 is a block diagram of a manufacturing process for a conventional rotor shaft, and Figure 3 is a side view of a conventional rotor material.
Figures 4 to 6 are cross-sectional views of the rotor in the rotor machining process, Figures 7 and 8 are front views of the rotor in the rotor machining process, Figure 9 is a side view of the shaft, and Figure 10 is the rotor shaft. 11 is a front view of the irregularly shaped material in one embodiment of the present invention, FIG. 12 is a front view of the same irregularly shaped material during press molding, and FIG. 13 is a view of the rotor material after the irregularly shaped material is formed. 14 is a perspective view of a rotor in which the rotor material is integrally joined, FIG. 15 is a side sectional view of a rotor shaft in which the rotor material and shaft are integrally joined, and FIG. 16 is a diagram of another embodiment. Front view of rotor material, No. 17
The figure is a side cross-sectional view of a rotor shaft in which a rotor material and a shaft are integrally joined in another embodiment. 16... Unusual material, 17... Fan-shaped vane sliding groove, 23... Rotor material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 6 Figure 2 Figure 3 n Figure 5 Figure 11, =14 diagram q

Claims (1)

[Claims] A process of manufacturing individual pieces by punching the vane sliding groove of a rotor having a vane sliding groove into a fan shape wider than a predetermined width, and a process of manufacturing the individual pieces so that the vane sliding groove has a predetermined width. A method for manufacturing a rotor, which includes a process of plastic working and a process of laminating individual pieces.