JPH0472493A - Manufacture of aluminum alloy made of rotor - Google Patents

Abstract

PURPOSE:To prevent the generation of die flaws onto the surface of a rotor by supplying lubricant from outside constantly into the vane groove bottom part formed part of a billet during its extrusion process. CONSTITUTION:In the method of manufacturing a rotor by extrusion molding a billet made of an alluminum alloy, lubricant 8 is constantly supplied into the vane groove bottom part formed part of the billet 13 during its extrusion process by a die 2, from a hopper 9 through a lubricant supply part 3. Extrusion resistance can be thereby suppressed to a low degree during the whole extrusion process so as to prevent the generation of die flaws to the vane groove bottom part of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing an aluminum alloy rotor, and particularly to a method of manufacturing a rotor used in a compressor of an air conditioner.

(Prior Art) Aluminum powder alloy rotors used in compressors of vehicle air conditioners and the like are generally manufactured by extrusion molding. Specifically, for example, after preheating a billet of aluminum powder alloy containing 17% Si,
The material is charged into a container, pressurized by a ram, and continuously extruded from a die 100 having a cross section as shown in FIG. Obtained molded body 101 (Fig. 4)
is IWJ cut into a predetermined length and processed into a rotor.

When a billet is deformed by pressure, most of its surface is restrained by one tool such as a die, so the pressure per unit area that should be applied to the billet marked 0; This is significantly higher than when using this method. Therefore, a large resistance (extrusion resistance) occurs between the billet and the die inner wall surface 100a, and a portion of the billet is deposited on the die inner wall (4 = 1), and this (; As shown in the figure, there are concave scratches (
Dicing) 102 often occurs. Molded body 101
Of the dicing 102 generated on the surface of the rotor, dicing 102 of parts to be processed later such as the rotor surface 101a
can be removed during the finishing process, but the vane groove bottom 101b, which acts as a vane back pressure chamber, is difficult to finish, and is usually used in the extruded state without being subjected to finishing processes. This increases the notch sensitivity,
When used under overload conditions, this dicing 102 may become a starting point and cause damage to the rotor.

Conventionally, in order to reduce extrusion resistance and suppress the occurrence of dicing on the surface of the molded product, for example, a billet was extruded by applying an easily extrudable caul plate made of an aluminum alloy with a composition close to that of pure aluminum to the tip of the billet. (Unexamined Japanese Patent Publication No. 64-5G21
No. 1) was proposed in 1, and a method was used in which moisturizer and 1 agent were applied to the inner wall surface of the die.

(Problem to be Solved by the Invention) However, when extrusion molding is performed by applying a 1111 easily extrudable patch plate to the tips 01S of billets 1 to 01S as in the method described above, in the initial stage of the extrusion process, at the start of extrusion, Although the initial pressure is small and dicing does not occur on the surface of the molded body, there is a problem that this effect cannot be obtained in the latter half of the process because the caul plate is consumed.

In addition, according to the method of applying the moisturizing agent to the inner wall surface of the die, if the coating thickness is too large, the rotor of the predetermined size and shape cannot be formed;
There was a problem that the desired effect could not be obtained because the 'd' DM agent was consumed.

The present invention has been made in view of the above-mentioned problems, and suppresses extrusion resistance throughout the entire extrusion process to prevent the occurrence of dicing of the rotor surface, thereby preventing the rotor from overloading.
An object of the present invention is to provide a method for manufacturing an aluminum alloy rotor that will not be damaged even when used in the following manner.

(Means for Solving the Problems) According to the present invention, two objects of the present invention are to provide a rotor manufacturing method in which a rotor is manufactured by extrusion molding an aluminum alloy billet, in which n; This is achieved by constantly supplying lubricant from the outside to the vane groove bottom forming portion of the billet.

(Function) During the billet extrusion process, lubricant is constantly pumped through the lubricant supply passage provided in each vane groove forming portion of the die, and is supplied from the outlet end of the passage to the vane groove bottom forming portion of the billet. The appropriate amount is supplied to the billet during deformation.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of a rotor extrusion molding apparatus for carrying out the method according to the present invention.

The extrusion-molded g1 has a die 2 and a lubricant supply section 3 as main components. The lubricant supply nl53 is connected to the die 2
a supply pump 6 connected to the pressure feed pipe 4 via a line 5; and a lubricant 8 storage connected to the middle of the line 5 via a line 7. It is composed of a hopper 9, a supply amount adjustment valve 10 disposed in the middle of the pipe line 7, and a pressure gauge 12 connected in the middle of the pipe line 5 via a branch v11.

In the die 2, a plurality of vane groove forming portions 2b are integrally provided inwardly protruding from the inner peripheral surface of the annular main body 2a, and are arranged at equal intervals in the circumferential direction of the die 2. Inside the die 2, a discharge j and a filler supply passage 14 are formed extending from the annular main body 2a to each vane groove forming part 2b, and the supply passage 14 is
The eye end +4a is the outer circumference of die 2 +m 2 c, and the output IJ
The ends 14b are spaced apart from the tips of the vane groove forming portions 2b. The pressure feed pipe 4 consists of an annular main body 4a and a plurality of branch parts 4b extending radially inward from the main body 4a at equal intervals in the circumferential direction, each of which has a corresponding feed passage 1.
4 is connected to the inlet end 14a. Furthermore, pressure feeding? Two or more 74 may be arranged along the axial direction of the die 2.

Next, the operation of this embodiment will be described. Extrusion of billet 13] In step 1, by operating the supply pump 6 and opening the valve 10 to an appropriate opening degree, the lubricant 8 stored in the hopper 9, such as boron nitride powder or graphite powder, is pumped to the required pressure. Below, it is pumped via lines 7, 5 into the main body 48 of the pumping pipe 4. The lubricant 8 is fed into the lubricant supply passage 14 in approximately equal amounts from the pressure feed pipe main body 4a through each branch portion 4b. Thus, the lubricant 8 is supplied from the outlet end +4b of the lubricant passage 14 to the vane groove bottom forming portion of the billet 13 which is being deformed under pressure by the red die 2.

In this way, during the extrusion process, the lubricant 8 is always evenly supplied to the billet 13, which is the rotor material, from the outlet ends 14b of the lubricant supply passages 14 arranged at equal intervals in the circumferential direction of the die 2. The surface of the vane groove bottom forming portion of the die 2 of the billet 13 is uniformly coated, and the billet 13
The extrusion resistance due to the friction between the rotor molded body and the die 2 is reduced, and the occurrence of die scratches on the surface of the vane groove bottom forming portion of the rotor molded body is prevented.

Furthermore, Jun'? The supply amount of the f agent is always adjusted to an appropriate value that balances the shear resistance of the billet with the valve lO and the pressure 11'! 2, the extrusion resistance acting on the die (= shear resistance + frictional resistance between billet 13 and die 2) is approximately Since it is held constant, billeting during the extrusion process
No die scratches occur over the entire extrusion length.

On the other hand, in the conventional example, as shown by 8 in FIG. 2, the extrusion resistance is low during the short extrusion length, that is, at the initial stage of the extrusion process, as in the present example, but as the extrusion length becomes longer, i.e. In the latter half of the extrusion process, the extrusion resistance increases rapidly.

(Effects of the Invention) As described above, the method for manufacturing a rotor according to the present invention is a method for manufacturing a rotor in which the rotor is manufactured by extruding an aluminum alloy billet. Since lubricant is constantly supplied from the outside to the part forming the bottom of the vane groove, the extrusion resistance is kept low throughout the extrusion process, and the occurrence of die scratches at the bottom of the vane groove of the rotor is prevented. This has the advantage that it will not be damaged even if it is used under overload conditions.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional configuration diagram of a rotor extrusion molding apparatus for carrying out the method of the present invention, FIG. 2 is a diagram comparing the extrusion resistance of the die part of the present invention and a conventional example, and FIG. Fourth
The figures show conventional embodiments, with FIG. 3 being a cross-sectional view of the die, and FIG. 4 being a partial perspective view of an extruded rotor molded body. 8. Lubricant, 101. Rotor molded body, 101b. Vane r/ζ bottom. Leather 1 diagram

Claims (1)

[Claims] 1. A rotor manufacturing method in which a rotor is manufactured by extrusion molding an aluminum alloy billet, characterized in that a lubricant is constantly supplied from the outside to the vane groove bottom forming portion of the billet during the extrusion process. Method.