JP2513705Y2 - Electric strainer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an electric forging in which a rod-shaped material is pressed toward a fixed electrode to be electrically heated to form a large-diameter lump portion at the shaft end of the material on the fixed electrode side. It relates to a compression device.

[0002]

2. Description of the Related Art Conventionally, a rod-shaped material having a predetermined diameter and a predetermined length
From (1), for example, the one shown in FIGS. 3 to 4 is known as an electric stretching device for forming an intermediate product of an engine valve.

Reference numeral (2) is a sliding electrode made of copper, which is composed of a pair of electrode pieces (3) and has a semi-arcuate support groove (not shown) having the same diameter as that of the material (1) on the opposing flat portions. No) is cut. The pair of electrode pieces (3) are attached to a holder (not shown) of a driving device so that they can be moved relatively in the arrow direction.

(4) is a fixed electrode located above the sliding electrode, and (5) is located below the sliding electrode (2).
A pressing rod that moves up and down by (not shown) and pushes up the material (1).

In order to manufacture an intermediate product of an engine valve by using the above-mentioned apparatus, both electrode pieces (3) are separated from each other and the pressing rod is pressed.
(5) is lowered and the material (1) is grasped by fingers (not shown), inserted between both electrode pieces (3), and both electrode pieces (3) are closed and brought into close contact as shown in FIG. .

Then, power is supplied to the sliding electrode (2) and the fixed electrode (4) from the power source (6) to raise the pressing rod (5). Material (1)
Rises while sliding between both electrode pieces (3), and when the upper end of the material (1) presses the fixed electrode (4), the sliding electrode of the material (1)
Electric current is applied between (2) and the fixed electrode (4). The shaft end of the material (1) is red-heated by resistance heating and softens, and further rises by the pressing rod (5).
(7) is formed. After that, the intermediate portion of the engine valve is obtained by pressing the lump portion 7 to form the umbrella portion.

[0007]

In the manufacture of the above-mentioned intermediate product of the engine valve, the upper end of the material (1) presses one point of the fixed electrode (4). However, by supplying power to the fixed electrode (4) and the sliding electrode (2), the heat generated at the shaft end of the material (1) is transferred to the fixed electrode (4), and in this state, the fixed electrode ( 4) Material
When (1) is pressed, the surface of the fixed electrode (4) becomes uneven,
There is a problem that the fixed electrode (4) is deformed.

The present invention has been made in order to solve the above-mentioned problems. It is appropriately cooled by air to prevent the deformation caused by the heat buildup of the fixed electrode, that is, the heat buildup of the fixed electrode. It is an object of the present invention to provide an electric stretching apparatus that prevents the above.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention presses a rod-shaped material toward a fixed electrode and electrically heats it so that the shaft end on the fixed electrode side of the material is large. In an electric stretching apparatus configured to form a lumped portion having a diameter, the fixed electrode is formed with an axis and a contact position of a material around the axis, and the fixed electrode is rotated by a predetermined angle around the axis. Means is provided, and an air supply device is provided on one side of the fixed electrode so that the nozzle provided at the tip of the air supply pipe faces the fixed electrode.

[0010]

The fixed electrode is rotated by a rotating means at a required angle each time one or a plurality of materials are processed, and the contact portion with the material is sequentially changed. The fixed electrode is cooled by blowing air from the nozzle of the air supply pipe in the supply device to the fixed electrode.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described with reference to the drawings. In addition, the same member as the member shown in the conventional example,
The same reference numerals are given and detailed description will be omitted.

FIG. 1 shows the situation at the time when the molding of the intermediate product of the engine valve is completed. Reference numeral (8) in FIG. 1 denotes an air supply pipe in an air supply device (not shown) whose supply of air is controlled by a control device (not shown). In this embodiment, the air supply pipe (8) Nozzle (9)
Of the fixed electrode (4) is arranged so as to face above the pressed contact portion (A1 ′) of the fixed electrode (4).

In this way, the nozzle (9) is directed above the pressure-contacted portion (A1 ') of the fixed electrode (4), so that air is directed toward the shaft end of the material (1) during air blowing. Since it cannot be sprayed, the fixed electrode (4) is prevented from cooling.

The fixed electrode (4) has an axis and the fixed electrode.
A pressing position of the material around the axis of (4) is formed, and this device is provided with a rotating means (not shown) for rotating the fixed electrode (4) around the axis (in this embodiment, by 90 degrees). Has been. That is, A1 on the lower surface (4a) of the fixed electrode (4)
After the pressing on the part is finished, move the fixed electrode (4) in the direction of the arrow.
By rotating it by 90 °, the lower surface (4a) is pressed continuously and continuously at four places to prevent the fixed electrode (4) from accumulating heat.

The control device may be a known control means,
A person skilled in the art can easily understand the details, but a detailed description thereof will be omitted.

Next, the operation of the present invention will be described. When the molding of the engine valve intermediate product (1) is completed, the pressing rod
(5) descends, and then the pair of electrode pieces (3) moves in the direction of the arrow (outward) in FIG.

At this time, the intermediate product (1) drops downward,
It is received by an appropriate receiving stand (not shown).

Thereafter, the fixed electrode (4) is rotated 90 ° counterclockwise as shown in FIG. 2, and the pressed portion A1 of the lower surface (4a) of the fixed electrode (4) moves to A1 '. When the fixed electrode (4) stops rotating, the control means (not shown)
Detecting that the rotation of (4) has stopped, the air supply device is activated, and air is blown from the nozzle of the supply pipe (8) above the pressed portion A1 'of the fixed electrode (4) for a fixed time and fixed. electrode
(4) is cooled. At the same time as blowing air, the fixed electrode (4)
A lump (7) is formed at the shaft end of the material (1) at the portion A1.

After that, the fixed electrode (4) is rotated by 90 ° again, and the pressed portion (A1 ') of the fixed electrode (4) is repeatedly cooled by air. After being pressed by A1, A in Fig. 2
Although the fixed electrode (4) may be cooled by blowing air in other portions other than the 1'portion indicated by imaginary lines, immediately after the fixed electrode (4) is pressed, cooling is performed by blowing air. Is preferable because the cooling effect becomes large.
The rotation angle is not limited to 90 ° and may be 180 ° or 360 °. Further, the number of nozzles is not limited to one. As described above, according to the present invention, the blowing of air causes the fixed electrode
Since the pressed portion (A1 ') in (4) is cooled and this portion is cooled, accumulated heat does not occur in the fixed electrode (4) even when a long-time operation is continuously performed. Therefore fixed electrode
No deformation occurs in (4).

[0020]

EFFECTS OF THE INVENTION (a) Since the air supply device is provided and the air is blown, the fixed electrode is cooled by the air, and the accumulated heat does not occur on the fixed electrode even after long-time work. (b) The fixed electrode is not deformed by pressing the material.

[Brief description of drawings]

FIG. 1 is a front view of a stretching device immediately after the completion of stretching according to an embodiment of the present invention.

FIG. 2 is a bottom view of a fixed electrode.

FIG. 3 is a front view of a conventional stretching device when starting the stretching.

FIG. 4 is a front view of the stretching device just before the end of stretching.

[Explanation of symbols]

 (1) Material (2) Sliding electrode (3) Electrode piece (4) Receiving (fixed electrode) (4a) Lower surface (5) Push rod (6) Power supply (7) Bulk part (8) Air supply pipe (9) ) Nozzle (A1) (A1 ') part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-63-56329 (JP, A) JP-A-1-271022 (JP, A) JP-A-63-177937 (JP, A) JP-A-3- 275242 (JP, A) JP-A-50-33153 (JP, A) Actually opened 57-21447 (JP, U) Actually opened 59-157743 (JP, U) Actually opened 51-157517 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. An electric stretching apparatus in which a rod-shaped material is pressed toward a fixed electrode and electrically heated to form a large-diameter lump portion at a shaft end of the material on the fixed electrode side, The fixed electrode is provided with an axis and a contact position of the material around the axis, and a rotating means for rotating the fixed electrode around the axis by a required angle is provided. An electric retractor comprising an air supply device in which a nozzle provided at a tip is directed toward a fixed electrode.