JPS6281259A - Die casting method - Google Patents

Abstract

PURPOSE:To reduce the time for trimming and chamfering and to reduce the cost of a die-cast product by executing die casting in such a manner that the chamfered part at the end face of a linear embedded by casting in a metallic mold is coated with an excess metal and blanking the excess metal after casting to expose the chamfered part. CONSTITUTION:The liner 2 of which the end face is preliminarily chamfered prior to die casting is embedded by casting and a crank case body 1 is die-cast by the metallic mold which forms the excess metal 1' to the chamfered part 2' of the liner 2. The excess metal 1' is blanked by giving impact to the surface 1'' of the excess metal 1' after casting, by which said surface is finished. The time for chamfering is considerably reduced as compared to the conventional case in which the straight liner end face is chamfered after casting. The cost of the die-cast product is thus reduced overall.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a die-casting method that is applied to a die-cast product in which a liner is cast and which requires chamfering of the end face of the liner.

<Prior art> Conventionally, in the crankcase for a compressor, in the part corresponding to part ■ in Fig. 2, as shown in Figs. The cast liner 2 is machined (puncture).

<Problems to be Solved by the Invention> However, the process of chamfering the end face of the liner described above has a longer cycle time than other processes, which poses a problem in the processing line.

The present invention has been made in view of the current situation, and it is an object of the present invention to provide a die-casting method that can shorten the machining time in chamfering the end face of a liner.

Means for Solving the Problems> In order to achieve the above object, the configuration of the present invention is to cast-in a liner whose end face has been chamfered before die-casting, and to add excess thickness to the chamfered part of the liner. Guikasu I depending on the mold to be formed
- It is characterized by performing the following.

Effect> With the above configuration, the excess thickness of the chamfered portion after die-casting can be punched out by impact, and the chamfered portion of the liner can be exposed.

Embodiment Hereinafter, a description will be given based on FIG. 1, which is a sectional view for explaining the processing steps of an embodiment according to the present invention.

The liner 2' has been chamfered in advance as shown in Figure 1 (a).
When molded into a die-cast product, 1' is shown in Figure 1 (b).
Make a mold so that the extra metal shown in is formed. By applying a dark blow to surface 1" during the finishing process, 1'6 of the excess material is punched out and the target chamfered shape as shown in Fig. 1 is obtained. At this time, compared to the conventional technique, Although the chamfering process and the flat finishing after die-casting are two factors that increase costs, the effect of shortening the processing time on the processing line is significant, resulting in an overall cost reduction.

<Effects of the Invention> As described above, according to the present invention, processing time can be shortened, contributing to cost reduction.

[Brief explanation of drawings]

Figure 1 (A1. ),(B)(
FIG. 2 is an enlarged cross-sectional view of the section ■ in FIG. 2; Also, in the symbols in the diagram, 1 is the crankcase body, 2j2
'Crawling, ina, 1' is extra meat, 1' is surface. Patent applicant: Mitsubishi Heavy Industries, Ltd., acting agent

Claims (1)

[Claims] A die-casting method characterized in that, before die-casting, a liner whose end face has been chamfered in advance is cast-in, and die-casting is performed using a mold that forms excess thickness on the chamfered portion of the liner.