JPS621117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a scroll for a scroll compressor, and particularly to a method for manufacturing a scroll for a scroll compressor that is excellent in mass productivity.

First, various methods for manufacturing scrolls for scroll compressors of this type will be described below with reference to FIGS. 1 to 6.

Scroll for scroll compressor (hereinafter simply referred to as scroll in the explanation of each figure above)
As shown in Fig. 1, the flange 1 has a smooth disc-shaped surface and the narrow spiral wrap 2
It is made up of.

Manufacturing methods for such scrolls include cutting,
Possible methods include precision forging and hot/cold forging.

However, these processing methods have the following advantages and disadvantages.

(1) Although the cutting accuracy is good, the cutting time is extremely long.

(2) Precision casting requires short molding time, but dimensional accuracy is poor.

(3) Forging requires a short forming time, but it is difficult to form materials with high strength.

As mentioned above, when manufacturing scrolls in one piece, there are many manufacturing problems.

Therefore, the current method is to divide the scroll into a lap 2A shown in Fig. 2 and a flange 1A shown in Fig. 3, which has a spiral groove with extremely high dimensional accuracy on a smooth disc-shaped surface. A method of using the wrap 2A as a scroll by inserting the wrap 2A into the spiral groove of the flange 1A and integrating it by caulking, diffusion bonding, resistance welding, or other methods during the assembly process has been studied. There is.

In this case, the dimensional accuracy of the scroll is ensured by the spiral groove. Therefore, extremely strict precision is required for the grooves on the upper surface of the flange 1A.

As a countermeasure for this, the flange is made by precision press punching or half punching, which is mass-producible and easy to obtain dimensional accuracy, and is made of an end plate 3 with a spiral slotted hole in a flat disk, as shown in Fig. 4. The idea is that by dividing the bottom plate 4 into forged and machined bottom plates 4 shown in Fig. 5 and combining them, a highly accurate flange 1B as shown in Fig. 6 can be obtained, and a highly accurate scroll can be manufactured. There is also.

However, this method requires three parts including the wrap to make the scroll, and it is difficult to process the mold for manufacturing the end plate 3, and it is difficult to maintain the dimensional accuracy of the spiral groove. There are many technical problems in mass production, such as the difficulty of managing the molds used for punching, and the lifespan of the molds being shorter than that of regular punching molds.

An object of the present invention is to provide a method for manufacturing a scroll for a scroll compressor, which eliminates the drawbacks of the various methods and techniques described above, has excellent mass productivity, and can obtain products with good dimensional accuracy. It is.

The feature of the present invention is that after cutting a thin plate into a shape corresponding to the length and width of the spiral portion, a wrap of the spiral thin plate is manufactured by bending, and the wrap of this spiral thin plate is
After inserting it into a jig with a slotted hole of the same shape with both ends protruding, this is assembled into a separate flange, and the protruding lower end is placed on the smooth circular plate surface of the flange, and these are attached to a flat plate. The present invention provides a method for manufacturing a scroll for a scroll compressor, in which the wrap and flange are joined together by applying electricity through a roller electrode placed on an electrode and sequentially moved along the protruding upper end of the wrap.

More specifically, by placing and fixing a spiral-shaped thin plate formed by shearing or bending on a flat plate using a positioning jig, and joining it as is, the scroll can be manufactured with fewer processing steps and higher precision than before. It is designed to manufacture scrolls for compressors.

Next, one embodiment of the present invention will be described with reference to FIGS. 7 to 11, together with FIG. 2.

Here, FIG. 7 is a perspective view of a flange used in a method for manufacturing a scroll for a scroll compressor (hereinafter simply referred to as scroll as before) according to an embodiment of the present invention, and FIG. Fig. 9 is a cross-sectional view showing the insertion of the wrap and jig in the manufacturing method, and Fig. 10 is a perspective view of the scroll made by joining by the method, Fig. 10 is the superposition of the scroll shown in Fig. 9 onto the flange. FIG. 11 is a cross-sectional view also showing the joining method in the manufacturing method.

In the figure, 1C is a flange, 2A is a lap similar to that shown in Figure 2, 5 is a hole, 6 is a jig, 7 is a protrusion, 8 is a flat electrode, 9 is a protrusion, and 10 is a roller electrode. It is something.

First, the lap 2A of the spiral thin plate is processed as follows.

That is, it is obtained by cutting a thin plate of polished steel plate into a shape corresponding to the length and width of the spiral portion of the wrap 2A, and then bending it.

The flange 1C is made by warm forging a cylindrical block and then cutting or drilling it into a predetermined shape, including a hole 5 for setting a jig used in the manufacturing process described below. The object is to obtain one having a smooth disk surface.

Next, a method for manufacturing the scroll shown in FIG. 8 by joining the above-mentioned wrap 2A and flange 1C will be explained with reference to FIGS. 9 to 11.

First, a slotted hole having the same shape as the wrap 2A is provided, and both upper and lower ends of the wrap 2A have a height that protrudes from the surface of the slot by about 2 mm, and a groove corresponding to the hole 5 of the flange 1C is provided on the outer periphery of the bottom. A jig 6 having projections 7 formed thereon is separately prepared, and using this jig 6, the wrap 2A is inserted into the jig 6 in the state shown in FIG.

Next, the jig 6 into which the wrap 2A is inserted is assembled into the flange 1C as shown in FIG. 10, and the lower end of the wrap 2A is placed on the flange 1C.

At this time, the flange 1C and the wrap 2A are aligned by fitting the protrusion 7 of the jig 6 into the hole 5 of the flange 1C as shown in the figure.
This allows the wrap 2A to be set at an appropriate position.

Finally, the lap 2A and the flange 1C are joined using the jig 6 using the method described above.
This is done, for example, by seam welding, with the flange 1C and the flange 1C superimposed on each other.

That is, as follows.

As shown in FIG. 11, the lap 2A assembled in the jig 6 and the flange 1C are placed on a flat plate electrode 8 in which a projection 9 corresponding to the hole 5 of the flange 1C is formed. The alignment at this time can be set at an appropriate position using the hole 5 of the flange 1C and the protrusion 9 of the flat electrode 8.

Next, another roller electrode 10 is separately arranged on the upper surface of the wrap 2A.

In this embodiment, in this case, the flat electrode 8 or the roller electrode 10 is sequentially connected to the lap 2.
The mechanism is such that the upper surface of A can move along the involute curve while being in contact with each other.

In the above state, the roller electrode 10 is wrapped 2
While sequentially moving the upper surface of the roller electrode 10
By applying a predetermined current to the plate electrode 8, the wrap 2A and the flange 1C are bonded to each other, and a scroll having the necessary bonding strength can be manufactured.

After joining, by extruding the wrap 2A from the jig 6, the scroll shown in FIG. 8 is obtained.

As explained in detail above, according to the present invention,
○There is no need to create a spiral groove on the smooth disc surface of the if flange 1C to insert the lap 2A.
○There is no need to use a head plate (end plate 3 as shown in Fig. 4) with a spiral slot cut out using a mold, and ○In order to fix the harness 2A to the flange 1C, screws etc. Since no fixing parts are required, mass productivity is extremely good, and scrolls for scroll compressors can be mass-produced at low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a scroll for a scroll compressor; FIG. 2 is a perspective view of a bent and formed wrap;
FIG. 3 is a perspective view of a flange with a spiral groove;
FIG. 4 is a perspective view of the end plate with spiral holes;
The figure is a perspective view of the bottom plate incorporated under the end plate in FIG. 4, FIG. 6 is a perspective view showing a state in which the end plate and bottom plate in FIGS. 4 and 5 are overlapped, and FIG. FIG. 8 is a perspective view of a flange used in the manufacturing method of a scroll for a scroll compressor according to an embodiment.
FIG. 9 is a perspective view of a scroll for a scroll compressor made by bonding using the manufacturing method, and FIG.
FIG. 0 is a cross-sectional view showing how the material shown in FIG. 9 is superimposed on the flange, and FIG. 11 is a cross-sectional view also showing a joining method in the manufacturing method. 1C...flange, 2A...lap, 5...
Hole, 6... Jig, 7... Protrusion, 8... Flat electrode,
9...Protrusion, 10...Roller electrode.

Claims (1)

[Claims] 1. After cutting the thin plate into a shape corresponding to the length and width of the spiral part, create a wrap of the spiral thin plate by bending, and insert the wrap of the spiral thin plate into a jig installed in a slot of the same shape. After inserting it with both ends protruding, it is assembled into a separate flange, and the protruding lower end is placed on the smooth disc surface of the flange, and these are placed on the flat plate electrode, and the protruding upper end of the lap is placed on the flat plate electrode. 1. A method of manufacturing a scroll for a scroll compressor, characterized in that the wrap and flange are manufactured by joining the wrap and flange by applying electricity through roller electrodes that move sequentially along the scroll.