JPS62263859A - Production of scroll - Google Patents

Abstract

PURPOSE:To produce a scroll having high strength and light by forming under pressurizing Al or Al alloy containing as dispersing strengthened fibers and ceramic grains, as loading the restraint on the lap part in the metallic mold heated at the same temp. as the above metal. CONSTITUTION:Al or Al alloy containing as dispersing the strengthened fibers such as carbon fibers, etc., and the ceramic grains 2 such as Al2O3, etc., is heated to make to semi-melting condition and set at between the upper and lower mold 7, 8 of the metallic mold. The upper and lower mold 7, 8 is heated and held at almost same temp. as Al or Al alloy's by heaters 12, 13. Next, the upper mold 7 is descended, and also the constant restraint F is given to the lap part 3 by a back pressure pin 9, to form under pressurizing Al or Al alloy. In this way, the prescribed lap 3 end plate 4, flange 5 are shaped integrally in one body and the scroll having high strength, in which the strengthened fibers and ceramic grains are distributed as flowing from the end plate 4 to the lap 3, is obtd.

Description

[Detailed description of the invention] [Industrial application field] The present invention is lightweight for use in scroll compressors.

The present invention relates to a method for manufacturing a high-strength scroll.

[Conventional technology]

Scroll compressors combine a fixed scroll and an orbiting scroll, and the orbiting scroll is rotated by an electric motor to draw in and compress fluid.

It is something that is discharged.

As is clear from the external shape shown in FIG. 5 and the longitudinal cross-sectional view shown in FIG. 6, the fixed scroll and the orbiting scroll have
It is composed of a scroll mirror plate 4, a wrap 3, and a flange portion 5. Conventionally, methods for processing such scrolls include casting cast iron or aluminum alloy castings in one piece and machining them in secondary processing, or
A method has been proposed in which the wrap 3 and the wrap 3 are processed separately by press molding, electric discharge machining, etc., and then fastened and integrated by secondary processing.

Also, a method of integrally molding the end plate and the lap portion using a normal forging method is also being considered.

[Problem that the invention seeks to solve]

When using cast iron castings, the specific gravity is 7.8 and the weight is heavy.
On the other hand, in the case of aluminum alloy castings, although the weight can be reduced, the mutual wear resistance of the fixed scroll and the orbiting scroll is a problem due to lack of strength.

Furthermore, the method of processing the end plate and the wrap separately and integrating them through secondary processing complicates the processing steps and makes it difficult to ensure dimensional accuracy after integration.

Furthermore, when a difficult-to-form material containing reinforcing fibers or ceramic particles is integrally molded by the latter ordinary forging method in order to obtain high strength, cracks occur and molding is difficult.

[Failure to solve the problem]

In order to solve the above-mentioned problems of the conventional technology, the present invention uses a difficult-to-form material containing reinforcing fibers and ceramic particles in an aluminum alloy, and uses a material that is difficult to form in the lap part while keeping the mold and material at the same temperature. It is integrally formed by forging while providing a restraining force.

[Effect]

By keeping the mold and material at the same temperature and applying a restraining force,
Can prevent molded products from cracking.

This makes it possible to process materials that are difficult to form, which was previously considered difficult.

〔Example〕

In FIGS. 1 to 4, 1 is a cylindrical material, 2 is a reinforcing fiber and ceramic particles contained in the cylindrical material 1, and 3 is a spiral wrap protruding from one side of a disc-shaped end plate 4. , 5 is an annular 7 flange protruding from the other side of the end plate 4, 6 is the joint between the flap part 3 and the end plate 4, 7 is the upper die of the forging machine, 8 is the lower die, and 9 is the back pressure. 10 is a knockout pin, 12 is a heater for the upper mold 7, and 13 is a heater for the lower mold 8.

FIG. 2 shows an aluminum alloy cylindrical material 1 containing reinforcing fiber ceramic particles 2, which is a solid round bar cut out from a material manufactured by casting or extrusion. The vertical cross-sectional structure of this cylindrical material 1 is shown in FIG. Before forging, the reinforcing fibers and ceramic particles 2 contained in the aluminum alloy cylindrical material 1 are transferred into the aluminum alloy in a state where the fiber directions are scattered as shown in FIG.

Such an aluminum alloy cylindrical material is formed into a scroll shape in a forging die that combines an upper die 7 and a lower die 8 as shown in FIG. Reference numeral 9 indicates a back pressure pin that applies a restraining force F to the wrap portion 3.

During forming, the aluminum alloy cylindrical material 1 shown in FIG. By inserting and lowering the upper mold 7,
A cylindrical material 1 is formed into a scroll shape. At this time, upper mold 7
is lowered and at the same time, a constant restraining force F is applied to the wrap portion 3 during molding.

In this way, the height of the lap part 3 is formed to a predetermined size, and at the same time, the reinforcing fibers and ceramic particles 2 contained in the aluminum alloy are destroyed by rapid deformation during forging, and the normal forging process is performed. To prevent cracks, etc. that occur, the upper die 7 is removed, and the specified wrap 3,
The product integrally molded on the end plates 4 and 7 and the flange 5 can be taken out from the lower die 8 by lifting the knockout pin 10.

A compressor scroll molded in this manner is shown in FIG. 4. FIG. 4 shows the longitudinal cross-sectional structure of the formed scroll.

The reinforcing fibers and ceramic particles 2 contained in the aluminum alloy are forged so that the fiber direction shifts along the material flow, making it possible to create a wrap 3 which is particularly difficult to process.
Since the fibers 2 migrate along the molding direction at the joint 6 between the end plate 4 and the end plate 4, the strength is improved compared to a cast product or the like.

Here, the ceramic particles may be alumina, silicon carbide, or other particles, and the reinforcing fibers may be carbon fibers, whiskers, or other fibers.

〔Effect of the invention〕

By using a difficult-to-form material such as an aluminum alloy material containing reinforcing fibers and ceramic particles, and by forging the scroll, end plate, and seven lunges to be simultaneously integrally formed, the fiber structure is distributed so as to flow from the end plate to the wrap, and the wrap is A high-strength and lightweight scroll can be manufactured without cracking at the root part, and a scroll compressor with high-speed rotation and quietness can be provided.

[Brief explanation of drawings]

FIG. 1 is a vertical front view of a forging machine for carrying out the method for manufacturing a scroll according to the present invention, FIG. 2 is a perspective view of a circular material, and FIG. 3 is a longitudinal sectional view of the material shown in FIG. FIG. 4 is a longitudinal sectional view of a scroll manufactured according to the present invention, FIG. 5 is a perspective view of a general scroll, and FIG. 6 is a longitudinal sectional view of a conventional product. 1... Circular material, 2... Reinforced fiber and ceramic particles. 3... Wrap part, 4... End plate, 7...
Upper mold. 8...Lower mold, 9...Back pressure pin, 12.13...
・Heater sub-agent Patent attorney Okamoto 1 2 outsiders Figure 1

Claims (1)

[Claims] Al or Al containing dispersed fibers or ceramic particles
A method for manufacturing a scroll, which comprises heating an alloy to a semi-molten state and press-molding it in a mold at approximately the same temperature while applying a restraining force to a lap part.