JPS60216969A - Insert method of liner by die-casting - Google Patents

Abstract

PURPOSE:To unite and bond surely a brass liner and an Al casting in the stage of die-casting the Al casting to the brass liner by plating preliminarily Ni to the outside peripheral surface of the liner thereby forming an intermetallic compd. between the liner and the casting. CONSTITUTION:The Ni is preliminarily plated 11 to the outside peripheral surface of the brass liner 7 and the Al casting 6 is die-cast via the plating 11 to the outside periphery of the liner 7 with respect to a method for forming a cylinder block, etc. by die-casting the Al casting to the brass liner. The intermetallic compd. such as Ni2-Al3 or Cu-Al2 is formed between the liner 7 and the casting 6 and the liner 7 is integrally bonded to the casting 6 by said compd. The sure bonding of the brass liner and the Al casting is thus made possible and the need for working to stop sliding between both is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention relates to an improvement in a liner inserting method by die casting, and particularly relates to a cylinder block obtained by aluminum die casting and a brass cylinder inserted into this cylinder block. This invention relates to an insert method for reliably joining each liner to a cylinder block and bearing liner made of aluminum casting, in a bearing obtained by block or aluminum die-casting and a brass bearing liner inserted into the bearing.

(b) Prior art In general, the method of inserting liners by die-casting is as follows:
This method is described in Japanese Patent Application No. 58-60389 and shown in FIG. To explain below, (6) is a cylinder block formed by aluminum die-casting, (7)
is a brass cylinder liner inserted into this cylinder block, and a groove αυ is formed on the outer circumferential surface of this cylinder liner (71) by a-left cutting. The liner and cylinder block (6) are joined by die-casting aluminum on the outer peripheral surface of the liner so that hot water can flow therein;
This prevents the liner (7) from coming off or rotating around the cylinder block (6).

However, according to the above method, the cylinder liner (
Since there is only the groove ah, which is a part of the elefina, when finishing the cylinder block (6), the cylinder liner (7
), stress equivalent to cutting resistance is concentrated on the groove (11J).Therefore, there was a problem that the inner circumference of the cylinder liner (
7) has a groove a formed in advance by secondary processing such as knurling.
I), which increases the number of work steps.

(c) Purpose of the invention The present invention has been made in view of the point of pasting, and the first aspect of k.
The purpose of this invention is to provide an insert method that prevents the liner from rotating or slipping out of the casting and reliably connects the liner and the casting in an aluminum die-cast liner insert. The second purpose of the above insert method is to eliminate the conventional groove machining on the liner, to prevent an increase in the number of work steps, and to reduce stress concentration in the groove portion that occurs when cutting the inner circumferential surface of the liner. This is to prevent distortion of the inner circumference of the liner.

B) Structure of the Invention According to the structure of the present invention, in a cylinder block or the like formed by aluminum die-casting on a brass liner, the outer peripheral surface of the brass liner is pre-plated with nickel, and the nickel-plated liner is By die-casting aluminum, the liner and the aluminum casting are separated by Ni,
-AA3, Cu-AA.

A brass liner and an aluminum casting are bonded together using this intermetallic compound.

(e) Examples Embodiments of the present invention will be described below based on the drawings.

(1) is a hermetic electric compressor constructed by housing a compressor part (3) and an electric motor part (4) in a hermetic case (2), and connecting these two parts by a rotating shaft (5). The compressor section (
3) consists of a cylinder block (6) formed by aluminum die-casting, a brass cylinder liner (7) inserted during casting of this cylinder block, and a piston (8) that slides back and forth within this cylinder liner. , a pulp plate (9) that closes the opening of the cylinder block (6), and a cylinder head (101).

Thus, aυ is a nickel plating layer applied in advance to the entire outer peripheral surface of the cylinder liner (7) prior to aluminum die-casting to the liner.

A method of inserting the cylinder liner (7) by aluminum die-casting in the cylinder liner constructed as described above will be described below.

First, a nickel plating layer aυ is formed over the entire outer peripheral surface of the brass cylinder liner (7). Next, the cylinder block (7) is made by die-casting aluminum to cover the plated cylinder liner (7).
6) Form the material. The casting temperature at this time was 610
The typical casting temperature is ~700°C. Finally, finishing work such as cutting the end face of the cylinder block (6) or cutting the inner peripheral surface of the cylinder liner (7) is performed to complete the cylinder block (6).

In the above insert method, the nickel plating layer αυ applied to the outer peripheral surface of the cylinder head (7) is melted by the heat of hot water during aluminum die casting. This melted nickel plating layer αυ also melts the outer peripheral surface of the brass cylinder liner (7). Therefore, the nickel plating layer αD is combined between the plating layer and the cylinder liner (7) and between the plating layer 0υ and the aluminum casting tonnage to form Cu, -A12, and Nil -AJ.

It produces intermetallic compounds such as

That is, the cylinder liner (7) made of brass and the cylinder block (6) made of cast aluminum have a nickel plating layer (1B
The liner is strongly bonded all around the liner by intermetallic compounds such as Ni, -AIB, and CTL-A/, which are produced by melting and combining with copper or aluminum.

(f) Effects of the Invention As described above, the present invention provides a cylinder block or the like formed by aluminum die-casting on a brass liner, in which the outer peripheral surface of the brass liner is pre-plated with nickel,
By aluminum die-casting this nickel-plated liner, Ni is added between the liner and the aluminum casting.
-Als, Cu-A7*, and other intermetallic compounds are formed, and the brass liner and aluminum casting are bonded together using this compound, making it possible to eliminate the conventional grooving of the liner and reduce work. This method prevents an increase in man-hours, eliminates stress concentration on the groove portion that occurs during cutting of the inner circumferential surface of the liner, and securely connects the liner and aluminum casting without causing distortion on the inner circumference of the liner. This prevents the liner from rotating or slipping out of the aluminum casting.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a cylinder block showing a conventional example, Fig. 2 is a longitudinal sectional view of a hermetic electric compressor showing an embodiment of the present invention, and Fig. 3 is a longitudinal sectional view of a cylinder block showing an embodiment of the present invention. 4 is an enlarged sectional view of the main part of the cylinder block shown in FIG. 3. (6)...Cylinder block, (7)...Cylinder liner, (111...Nickel plated.

Claims (1)

[Claims] (1) Brass liner When aluminum die-casting is used to form a cylinder block, etc., the outer peripheral surface of the brass liner is pre-plated with nickel, and this nickel-plated liner is then aluminum die-cast. and aluminum casting KN11 klB, C14
- A method for inserting a liner by die-casting, characterized in that an intermetallic compound such as AJt is generated, and the intermetallic compound binds the brass liner and the aluminum casting.