JPH01234516A - Device for supporting coil for high frequency quenching - Google Patents

Abstract

PURPOSE:To constantly hold a work contacting with a coil during heating the work and to obtain the work at uniform quenched temp. by holding up the work from the lower side with roller at other side of an arm fitting to a cylinder rod arranged in the coil body. CONSTITUTION:After setting the coil 2 at three positions with a positioning plate 12 to the work (c) of shaft product, etc., the cylinder 3 is worked to the position extending the rod 4, to turn the arm 6 as centering a supporting point 8. The arm 6 at the roller 9 side is ascended toward the work (c) and the roller 9 is brought into contact with the lower side of the work (c) and acted so as to lightly press the work (c) to the iron core 11. By this constitution, even in the case of coming to free state from the coil 2 during heating the work (c), the coil 2 and the work (c) are held to the contacting state with the roller 9 and the work (c) can be obtain under uniform quenching temp. and the quenched quality can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a support device for a coil for induction hardening of a shaft article such as a crankshaft.

(Prior Art) The journal portion of an engine crankshaft is subjected to surface hardening treatment such as induction hardening to prevent wear during rotation, and currently an induction hardening device called Erotherm is used.

As shown in FIG. 2, the above-mentioned hardening apparatus rotatably supports a main journal part, for example, if the workpiece is a crankshaft.

Rotate pin journal portion C 360°.

There is a coil body d equipped with a coil e that contacts the upper half of the pin journal portion C that is induction hardened as shown in FIG. It is attached to a coil holding head g that slides on the coil.

This coil holding head g is suspended by a spring balancer i provided protruding from the machine frame. As a result, the coil e can move up and down following the rotation of the rotation support means a. In addition, a quenching liquid tank j is provided below the coil body d.

Therefore, the rotary support means a rotates the pin journal portion C of the workpiece, while the coil e heats the upper half of the pin journal portion C by induction, so that the entire circumference of the workpiece is sequentially heated to a predetermined hardening temperature. When it reaches this point, it is immersed in a quenching liquid tank J provided at the bottom to cool it down and complete the quenching.

(Problems to be Solved by the Invention) However, with this device, when inductively heating the bin journal portion of the crankshaft,
As shown in (b), the rotation range 360 of the pin journal C
When the angle θ between the centers of main journal b and pin journal C is between 0° and 180°, the rotation direction is downward as shown in Fig. 4 (a), that is, it is easy to escape from coil e. .

Coil e cannot follow workpiece C, and gaps tend to form between them, resulting in variations in heating temperature.
Even if the adhesion was good between 80° and 36° as shown in FIG. 4(b), there was a problem that the quenching temperature was uneven as a whole and the product was defective.

In view of this, the present invention has been made for the purpose of providing a support device for an induction hardening coil, which improves the hardening quality by maintaining constant contact between the coil and the workpiece during heating of the workpiece. be.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cylinder in a coil body equipped with an induction hardening coil that contacts the upper part of a workpiece, and connects one end of an arm to the tip of the rod of the cylinder. The middle part of the arm is rotatably attached to a fulcrum provided at the bottom of the coil body, and the lower end of the arm is connected to the lower side of the workpiece when the arm rotates. The present invention is characterized in that it includes a rotatable roller that maintains the coil in contact with the coil.

(Function) With the above configuration, even if the workpiece rotates in a direction that allows it to escape from the coil, the cylinder is actuated to bring the arm closer to the workpiece, and the roller at the tip lifts the workpiece from below and moves it between the coil and the workpiece. The gap can be eliminated.

(Example) The present invention will be described below with reference to an example shown in FIG.

The support device for an induction hardening coil according to the present invention has an air cylinder 3 hanging down from the upper side of a coil body 1 which has a coil 2 for induction hardening at its lower part which is in contact with the upper part of a workpiece C. One end of an arm 6 is rotatably connected to the tip 5 of the rod 4 of the air cylinder 3 by a pin 7, and the middle part of the arm 6 is rotatably attached to a fulcrum 8 provided at the bottom of the coil body 1. At the same time, the lower end of the arm 6 is provided with a rotatable roller 9 that contacts the lower side of the work C and holds the work C and the coil 2 in contact when the arm 6 rotates. ing.

A cooling water pipe 10 is provided in the coil body 1 from the top toward the coil 2, so that when the coil 2 is constantly heated, it can be cooled.

The coils 2 are constituted by a pair and are located on the upper left and right sides of the workpiece C, and each coil 2 is provided with an iron core 11.

A plate 12 made of carbide material for positioning the work C is provided at the two coils and the lower end of the coil, and the upper half of the work C is thereby positioned for heating from the center.

The air cylinder 3 is connected to the ON and OFF states of an induction heating power source (not shown), so that the rod 4 is extended when it is turned on, and is contracted when it is turned off.

The roller 9 rotatably provided at the tip of the arm 6 by a pin 13 is made of a material having heat insulating properties such as ceramic or Hastelloy.

Next, the operation will be explained with reference to FIGS. 1 to 3. First, the coil 2 is attached to the workpiece (in this embodiment, the pin journal of the crankshaft) by the positioning plate 12.
When the induction heating power source (not shown) is turned on after the setting is completed, the working cylinder 3 operates in the direction of extending the rod 4, and as a result, the arm 6 rotates around the fulcrum 8, so that the arm 6 on the roller 9 side rises toward the workpiece C, and the roller 9 contacts the lower side of the workpiece C, moving the workpiece C toward the iron core 1.
It acts by pressing lightly on 1.

Next, when the workpiece C rotates around the main journal b, the coil 2 follows this and repeats heating while moving up and down, and after a predetermined time, when the workpiece C reaches a desired high temperature, the induction heating power source is turned off.

When this power is turned off, the air cylinder 3 operates,
After contracting the rod 4 and moving the roller 9 away from the workpiece C, the workpiece C is rotated downward around the main journal b.

The heated workpiece C is immersed in a quenching liquid tank as shown in FIG. 3 to complete the quenching.

In this embodiment, the cylinder is an air cylinder, but it may be a hydraulic cylinder.

(Effects of the Invention) As explained above, the present invention provides a coil body equipped with an induction hardening coil that is in contact with the upper part of a workpiece, and a cylinder is provided in the coil body, and one end of the arm is connected to the rod tip of the cylinder.
The middle part of the arm is rotatably attached to a fulcrum provided at the bottom of the coil body, and the lower end of the arm is attached to the lower end of the arm so that when the arm rotates, it contacts the lower side of the workpiece and connects the workpiece and the coil. Since it is equipped with rotatable rollers that keep the coils in contact with each other, even if the workpiece tends to escape from the coil during heating, the rollers keep the workpieces in contact with each other. This eliminates uneven hardening temperature and ensures uniform hardening. It has an excellent effect of being able to obtain workpieces with a certain temperature.

[Brief explanation of the drawing]

FIG. 1 is a front view of a support device for an induction hardening coil according to the present invention, and FIG. 2 is an explanatory diagram showing the relationship between a coil and a workpiece in a conventional induction hardening apparatus. Figure 3 is a schematic diagram of the entire conventional induction hardening equipment. FIG. 4 is a diagram showing the state of the coil and workpiece during hardening operation in a conventional induction hardening apparatus, where (a) shows poor adhesion and (b) shows good adhesion. ■...Coil body 2...Coil 3...Cylinder 4...Rod 5...Tip
6...Arm 7...Bin 8...Fully 9...Roller 11...Iron core 12...Plate 13...Pin C...Work Patent applicant Komatsu Ltd. Agent ( Patent Attorney) Oka 1) Engraving of Kazuyoshi Drawing Figure 1 Procedural Amendment (Method) July 1986 tL1 1 Mr. Teragogo Agency Commissioner 1 Indication of Case Patent Application No. 06249 of 1988
No. 5 Koshu Hayaki Ireyou Shin
Souch 2 - Name of the invention Support device for induction hardening coil 3 - Person making the amendment Telephone: (03) 584-7111 (Main) 4 Date of amendment order (shipping address) June 28, 1988 5 - Amendment target drawings

Claims (1)

[Claims] A cylinder is provided in a coil body equipped with an induction hardening coil in contact with the upper part of the workpiece, one end of an arm is connected to the rod tip of the cylinder, and the middle part of the arm is provided at the bottom of the coil body. The arm is rotatably attached to a fulcrum, and the lower end of the arm is provided with a rotatable roller that comes into contact with the lower side of the workpiece and holds the workpiece and the coil in contact when the arm rotates. A support device for induction hardening coils.