JPS62180976A - Electrical upsetting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field J] The present invention relates to a hollow upset removal process suitable for an upset pole forming process during engine valve manufacturing.

[Prior art] Conventional % 'l'4J: Air absent removal In forming an upset pole from 'ζ, for example, as shown in the longitudinal cross-sectional view (A) of Figure 2, two rollers are placed one above the other. Electrode 2
Load the workpiece 1 between the push-up table 4 and the push-up table 4,
The workpiece 1 is supported by the lower gold slide electrode 6 of the upset pole forming part 1 on the upper part, and electricity is applied from the power source 5 between the contact electrode 2 and the slide electrode 6 to heat the upset pole forming part 1'. When the push-up table 4 is raised while doing so, the upset pole forming portion 1 is compressed and formed into a predetermined upset pole 1 as shown in FIG. 6).

However, in such a method, the workpiece 1. Due to the sparks between the electrical parts 2, the high temperature of approximately 1200°C due to the heating of the upset pole molding part 1, and the compression effect caused by the rise of the push-up table 4, etc. 2
The contact surface of the five-piece electrode 2 with the workpiece 1 is oxidized and deformed, and further deteriorates due to repeated energization and compression processes, and eventually the specified upset pole cannot survive, and the contact electrode 2 has to be removed. Replacement is required.

However, the task of removing the 9 electrodes 2 is a major hindrance to the self-help process of the heavy upsetting method, and therefore, it is necessary to carry out the automated operation of the ``absent machining'' efficiently. It is important to minimize the number of replacements of the contact electrode 2.

[Problem that the invention seeks to solve]

The present invention was proposed in view of these circumstances, and
The purpose of the present invention is to explain the oxidation and deformation phenomena of a single pole, greatly extend the service life of a single pole, reduce the number of replacements, and develop an electric upset method that enables efficient automated operation. .

[Means to solve all problems]

To solve this problem, the present invention loads a workpiece between a contact electrode and a push-up table, supports the middle of the workpiece with a slide electrode, and energizes between the foot of the contact electrode and the slide. Then, a movable belt-like metal plate is interposed in the work part between the above-mentioned two electrodes to form the absent ball part.

Slide the electricity between the electricity buds to do! +! It is assumed to be an f sign.

[For production]

With the above configuration, it is possible to obtain an electric upset method that reduces oxidation and deformation of the contact electrode, significantly extends its service life, reduces the number of replacements, and enables efficient automated operation.

[Example J] An example in which the present invention is applied to the upset pole molding of all engine valves will be explained with reference to the drawings. Fig. 1 is a vertical cross-sectional view of a device that is a practical example of the method of the present invention, and (A) of the same figure is The overall view before molding, and the same figure (B) is a partial view after molding.

In the above figure, the same symbols as in FIG.
When loading between the
~2 long metal strips 6 are sandwiched between the upper end of the workpiece 1 and the lower end of the contact electrode 2.

This strip-shaped metal 6 is stretched between a supply reel 7 and a collection reel 8, which face each other at the same height as the contact electrode 2, with the same electrode sandwiched between them. The electrode 2 is sandwiched between the electrodes 2 and 2, and is periodically transferred to the collection side by an appropriate length by a transfer roller 9, so that a new portion comes into contact with the current electrode 2.

In such a device, the lower part of the upset pole forming part 1 of the workpiece 1 is supported by a slide electrode 3, and the contact electrode 2
When power is applied from a power source 5 between the holder and the slide electrode 3 to raise the push-up table 4 while heating the upset ball forming part 1, the upset ball forming part 1 is raised as shown in FIG. 1(B). ' is compressed and formed into a predetermined upset pole 1.

However, in this case, sparks during the absetting process are mainly caused by workpiece 1. This occurs between the strip metals 6, and therefore the degree of contact with the contact electrode 2 is reduced.Also, the heating temperature of the absent ball forming part 1 is not directly transmitted to the contact electrode 2 due to the interposition of the strip metal 6, so the high temperature and Deformation caused by the compression action is also avoided, and as a result, the period during which the contact electrode 2 deteriorates becomes longer, and its replacement cycle is extended.

〔Effect of the invention〕

In short, according to the present invention, a workpiece is loaded between a hit electrode and a push-up table, the intermediate part of the workpiece is supported by a slide electrode, and electricity is applied between the hit electrode and the slide electrode, so that the workpiece between both Doi Denkaku When forming an upset pole on a part, a movable metal strip is interposed between the contact electrode and the workpiece, and current is applied between one pole and the slide electrode to prevent oxidation and deformation of the contact electrode. The present invention is industrially advantageous because it provides an electric upset system that can be operated efficiently and autonomously, greatly extending its service life and thus reducing the number of replacements.

[Brief explanation of drawings]

Figure 1 (A) is a longitudinal cross-sectional view of the invention method and an actual feeding device in one embodiment in which the present invention is applied by molding an upset pole of an engine valve; Figure (B) is a partial view after molding. Figure 2 is a longitudinal sectional view of an apparatus for carrying out the conventional method;
A) is an overall view of molding [rl], and (B) is a partial view after molding. 1... Work, 1... Upset pole, 2... Per electrode, 6... Slide electric image, 4... Push-up table, 5...
...Power source, 6...Metal band, 7...Feeding IJ-le,
8...Recovery, -le, 9...Transfer roller. Sub-Agent Patent Attorney Tadashi Tsukamoto Bunseki Figure 1 and A) (A') Figure 2 ('B) I4

Claims (1)

[Scope of Claims] A workpiece is loaded between a contact electrode and a push-up table, an intermediate portion of the workpiece is supported by a slide electrode, and current is applied between the contact electrode and the slide electrode to raise the workpiece portion between the two electrodes. An electrical upset method characterized in that, when forming an upset pole, a movable metal strip is interposed between the contact electrode and the workpiece and current is passed between the contact electrode and the slide electrode.