JPH03138401A - Manufacture of scroll member - Google Patents

Abstract

PURPOSE:To perfectly and speedily remove burr without growing secondary burr differently from mechanical deburring by removing burr grown in the company of machining with an electrolytic deburring machine after machining a material made of metal member. CONSTITUTION:To manufacture the scroll member a metal raw material is initially machined and a scroll member 15, for example on the fixed side, having specific measurement and precision is manufactured. Successively, an electrode 3 is arranged and provided so that it faces against a plural number of burr grown due to machining with specific intervals. Additionally, the electrode 3 is supplied with an insulated coating 4 except for its area facing against burr and a passage 5 is formed to supply electrolyte from inside. Successively, an anode is connected to the scroll member 15, and after a cathode is connected to the electrode 3, they are soaked in electrolyte and electrified so as to carry out electrolytic deburring. Consequently, it is possible to speedily and perfectly remove all burr including those in local spots without growing secondary burr differently from mechanical deburring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a scroll member of a scroll-type fluid machine used as a compressor or an expander.

(Prior Art) An example of a conventional scroll compressor is shown in FIG.

As shown in FIG. 3, the compressor 1 has a housing 10 consisting of a front end plate 11 and a cup-shaped portion 12 connected thereto. A main shaft 14 passing through the center hole is rotatably supported by ball bearings 13, 23 disposed in the center hole of the front end plate 11 and the sleeve-like portion 24 connected thereto. A fixed scroll member 15 and a movable scroll 16 are disposed within the housing 10.

The fixed scroll member 15 includes a side plate 151 and a spiral body 152 erected on the inner surface of the side plate 151. Legs 153 provided on the outer surface of the side plate 151 are connected to the cup-shaped portion 12 by a plurality of bolts 17.
Fixed. The housing 10 is sealed by sealing between the outer peripheral surface of the side plate 151 and the inner wall of the cup-shaped portion 12.
The internal space is partitioned into a suction chamber 18 and a discharge chamber 19. The movable scroll member 16 is composed of a side plate 161 and a spiral body 162 erected on its inner surface.
62 has the same shape as the spiral body 152 of the fixed scroll member 15, and is engaged with the spiral body 152 with an angular deviation of 180°.

The movable scroll member 16 is connected to a drive mechanism and a rotation prevention mechanism, and revolves around a predetermined circular orbit as the main shaft 14 rotates. Fixed scroll member 1
A spiral tip seal 20 is fitted into a seal groove provided on the tip surface of the spiral body 152 of No. 5 so as to be retractable.
The movable scroll portion 10:4 is in sliding contact with the inner surface of the side plate 161 of
The tip seal 21, which is retractably fitted into a seal groove provided on the tip surface of the spiral body 162 of 16, is attached to the inner surface of the side plate 151 of the fixed scroll portion tj, I'15. - Slides into contact with the inner surface of Mupre-1-175.

When the movable scroll member 16 revolves on a predetermined circular orbit by rotationally driving the main shaft 14, the line contact portion between the side surfaces of the two spiral bodies 152 and 162 moves with each spiral. IJI L moves along the sides of the body 152, 162 towards the center of the spiral, so that the closed chamber 25 delimited by the interlocking of both scroll members 15, 16 does not reduce in volume and moves towards the center of the spiral. Move to. Therefore, the fluid flowing into the suction chamber 18 from the external fluid circuit through the suction boat 26 provided in the housing 10 is drawn into the closed chamber 25 from the outer ends of the spirals of both spiral bodies 152 and 162 and is compressed. , central closed chamber 2
5 is discharged into the discharge chamber 19 through a through hole 154 formed in the side plate 151 of the fixed scroll member 15, and from there flows out to the external fluid circuit via the discharge port 22 provided in the housing 10.

The fixed scroll member 15 and the movable scroll member 16 are machined from a metal material such as iron or aluminum to have predetermined dimensions and precision.

This machining process causes firmness in many places, but
Since the scroll members 15 and 16 have a complicated structure and require high dimensions and precision, the burrs have been removed manually using a brush or the like.

(Problems to be Solved by the Invention) In the above-mentioned conventional scroll member, the firmness caused by machining was manually removed, which caused problems in that it took time and effort, and increased production costs.

In addition, it is difficult to completely remove burrs manually, and if burrs remain, they not only have a negative effect on the performance of the compressor, but also cause abnormalities if the burrs fall off and enter the sliding parts. There was a problem that it caused wear.

(Means for Solving the Problems) The present invention was invented to solve the above problems, and the gist thereof is to machine a material made of metal members into predetermined dimensions and precision. ``After getting two,''
2. A method for manufacturing a scroll member, characterized in that burrs produced by machining are removed by electrolytic deburring.

(Example) An example of the present invention will be specifically described with reference to FIGS. 1 and 2.

FIG. 2 shows a perspective view of the fixed scroll member, and FIG. 1 shows a partial sectional view taken along line 1--1 in FIG.

First, a fixed scroll member 15 having predetermined dimensions and precision is manufactured by machining a metal material such as iron or aluminum, as shown in FIG.

Next, as shown in FIG. 1, an electrode 3 is inserted into the scroll member 1 using a jig, and the electrode 3 is inserted into the sea urchin facing the large number of burrs generated by the machining at a predetermined distance.
Fixed at 5. It should be noted that this electrode 3 is previously covered with an insulating coating 4 except for the portion facing C.1, and is provided with a flow path 5 for supplying an electrolytic solution from inside.

Then, the anode was connected to the fixed scroll member 15, the cathode was connected to the electrode 3, and the plate was immersed in an electrolytic solution at room temperature consisting of an aqueous solution of sulfur and lithium nitrate at a voltage of 30V and a current of 12V.
Electrolytic firming is performed by applying a current of 0 to 160 A every 15 seconds.

After electrolytic deburring, the specimen was observed under a stereomicroscope and in cross section using an optical microscope. As a result, there was no dimensional change, burrs were completely removed, and a smooth surface with a surface roughness of several μm was obtained. The edges now have a slightly rounded shape.

Further, as a result of testing of a scroll type compressor incorporating the scroll member manufactured in this manner, the amount of gas leakage was equal to or greater than that of a conventional compressor, and its performance and durability were good.

(Effects of the invention) In the present invention, burrs caused by machining are removed by electrolytic deburring, so unlike mechanical burr removal, there is no generation of secondary burrs and all burrs including local burrs are removed. It can be completely removed all at once and in a short period of time. and,
The surface after electrolytic deburring is smooth and the mechanical properties of the material hardly change.

Furthermore, since the electrolytic treatment can be carried out at room temperature, there is almost no dimensional change due to thermal effects. In addition, since the sharp portion has a slightly rounded shape, lubricity is also improved.

As a result, the productivity of the scroll member is improved and its cost can be significantly reduced, as well as its quality and reliability are improved, and the performance and durability of the scroll-type fluid machine incorporating the scroll member can be improved.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, in which FIG. 1 is a partial sectional view taken along arrow I-1 in FIG. 2, and FIG. 2 is a perspective view of a scroll member. FIG. 3 is a longitudinal sectional view of the scroll compressor.

Claims (1)

[Claims] A method for manufacturing a scroll member, which comprises finishing a material made of a metal member to predetermined dimensions and accuracy by machining, and then removing burrs generated by the machining by electrolytic deburring.