JPS6040590Y2 - Device for high-frequency heating of different circumferential surfaces of heat mass - Google Patents

Description

[Detailed description of the invention] This invention uses a loop-shaped work coil to rotate the workpiece and apply different heat masses to the circumferential surface of the workpiece at different rotational angle phases. The present invention relates to a device that performs high-frequency induction heating while controlling the supplied output using an output balancer.

Conventionally, a high-frequency induction heating device supplies a predetermined output to the work coil in order to harden the outer shaft surface and inner hole surface, which have different heat masses depending on the rotational angle phase, such as the large and small ends of a crankshaft or connecting rod. When heated, the cross-section of the hardened layer differs in thickness around the shaft or inner hole of the workpiece, as shown in Figure 3 at b, so the heat conduction loss on the outer surface of the shaft or the inner circumference of the hole differs, and the final In general, heat conduction loss is small in thin-walled parts, so heat accumulates, and when the outer periphery is hardened, the hardened layer W□ is large, and when the inside is hardened, the hardened layer depth becomes deep, and the thick-walled parts are heat conductive. Quenching width W2 due to large loss
Alternatively, the hardened layer depth t2 may be opposite to the above, causing problems such as generation of distortion, uneven wear, and uneven firing.

Uneven quenching width on sliding surfaces can cause uneven wear and damage, and there has been a long-awaited need for some kind of countermeasure.

Previous attempts have been made to solve this problem by adjusting the shape of the heating coil depending on the degree of heat conduction loss, ie, heat mass, of the circumferential surface, but this adjustment was difficult and did not provide a satisfactory solution.

The present invention was devised in view of the above circumstances, and is used in a high-frequency induction heating device in which an output balancer controls the output supplied to a work coil. It is an object of the present invention to provide a device that controls forward and backward movement in order to adjust the output according to the heat mass of the rotational angle phase of a circumferential surface using an interlocking control means that is equipped with a cam or the like and is linked to the rotation of a workpiece.

Next, the present invention will be explained in detail with reference to its embodiment drawings.

FIG. 1 is an explanatory diagram of a first embodiment of the present invention in which a cam is used as the interlocking control means, FIG. 2 is an explanatory diagram of a second embodiment in which a pinion gear and a rack are employed as the interlocking control means, and FIG. Diagram a
3 is an explanatory diagram of a state in which uneven quenching width occurs with the conventional device, FIG. 3 is an explanatory diagram of a state in which quenching depth is uneven, and FIG. FIG. 4 is an explanatory diagram of a state where the width is made uniform, and FIG. 4 is an explanatory diagram of the state where the hardening depth is made uniform.

In FIG. 1, the device of the present invention connects a crankshaft W as a workpiece to a rotary drive device 30 at one end by a chucking means, and rotatably holds it at the other end with a center holder 32. .

The crankshaft W is rotated at an appropriate speed according to the heating and quenching conditions by a rotary drive device 30 that is controlled by a motor and a speed reducer.

If the hardened shaft part W1 is a crank pin as shown in the figure, the semi-loop work coil C is seated on the front part of the crank pin at a predetermined distance via a spacer, etc., and covers approximately half of the heated part. Face to face.

It is provided with a mechanism (not shown) that faces the entire circumferential surface 11 of the crank pin W1 via a spacer while maintaining a predetermined distance from each other during one rotation of the crankshaft W. The circumferential surface 11 is heated by high frequency induction while receiving output adjustment from the output balancer 20.

The principle and structure of the output balancer 20 related to the present invention are explained in detail in Japanese Patent Application No. 53-066363 filed by the applicant of the present invention.

In the present invention, the output balancer 20 has a structure similar to that in the above specification, and the output balancer 20 has output control inductors 21 and 1 arranged in series with the output lead of the current transformer 2, and It is composed of an induced body 22 that partially consumes the output supplied to the work coil C.

The insertion amount of the inductor 22 into the inductor 21 and the power consumption have a predetermined relationship such as a proportional relationship.

The interlocking control means 40 transmits and controls the forward and backward movement of the guided body 22 of the output balancer 20 in accordance with the rotational angle phase of the crankshaft W. Rotary drive device 3
0 driving force causes the power transmission mechanism 41, that is, the rotational drive device 3
The wheel 411 and chain 412 fixed to the output shaft 31 of 0, the wheel 414 fixed to the camshaft 413, and the cam 42 attached to the camshaft 413 by a key or the like via the camshaft 413 are rotated. .

The cam 42 further includes a cam follower 43 which is slidably guided.
is driven, and the guided body 22 attached to the driven body 43 is reciprocated according to the profile of the cam 42.

The rotational angle phase relationship between the crankshaft W and the cam 42 is such that the maximum lift portion of the cam 42 acts so that the output consumption of the output balancer 20 is maximized at the top dead center portion of the crank pin W1, which has the lowest heat capacity. In addition, the minimum lift portion of the cam 42 is connected so that the output consumption of the output balancer 20 becomes zero (or minimum) at the bottom dead center portion of the crank pin W1 having the largest heat capacity. .

The profile of the cam 42 between the maximum lift portion and the minimum lift portion is determined by proportional distribution according to the heat mass of each rotation angle phase of the crank pin W1 determined by empirical rules or calculations using an integral method or the like. ing.

The device of the present invention has a structure in which various cams 42 are prepared depending on the type of workpiece W and the distribution of heat mass, and can be replaced by attaching and detaching a key.

The power loss consumed in the induced body 22 is absorbed by supplying and discharging a constant flow of cooling water.

In the second embodiment shown in FIG. 2, the interlocking control means 40
A pinion gear 47 and a rack 48 are used.

In the figure, a connecting rod W is prepared as a workpiece, and the inner circumferential surface 12 of the hole W2 at the large end of the connecting rod W is to be hardened.

The rotating paper drive device 30 attaches the connecting rod W using a chucking device or the like so that the center of rotation of the connecting rod W is at the center of the hole W2 at the large end, and rotates the connecting rod W at an appropriate speed according to the heating and quenching conditions. The work coil C is rotated around a semi-loop type work coil C inserted into the hole W2 while maintaining a constant distance from the inner circumferential surface 12 of the hole W2 via a spacer.

The work coil C is equipped with a high frequency oscillator 1 as in the first embodiment.
More heating output is supplied via a current transformer 2 and an output balancer 20.

However, the guided body 22 of the output balancer 20 drives a pinion gear 47, which is rotationally driven by the rotation of a variable speed reversible motor 46 controlled by the following control signal, by a rank 48 whose movement is guided by a roller or the like. Receive it and move forward and backward.

The rotation angle phase of the connecting rod W is determined by a zebra photo pattern in which white and black patterns are alternately arranged at equal pitches attached around the other rotation axis of the rotary drive device 30, and a photo sensor 44 that detects the zebra photo pattern. Detected.

This angular phase detection signal is sent to the controller 45 which stores a program for the rotational angular phase and heat mass distribution of the workpiece determined by the method described in the first embodiment.
The controller 45 controls the motor 46 so that the heating output is supplied to the work coil C even in accordance with the heat mass corresponding to the angular phase of the inner circumferential surface 12 facing the work coil C. transmit signals.

Therefore, the induced body 22 consumes a part of the supply output from the current transformer 2 according to the heat mass of the inner circumferential surface 12 facing the work coil C, so the work coil C supplies heating output according to the heat mass. The receiver is the inner circumferential surface 12
heat up.

According to the device according to the present invention having the configuration and operation described above, the output balancer 20 controls the heated portion of the workpiece W via the interlocking control means 40 interlocked with the rotary drive device 30 that rotates the workpiece W. The output can be adjusted according to the heat mass of the rotation angle phase of the circumferential surface 10.

As a result, the semi-loop type work coil C heats the circumferential surface 10 by being supplied with heating output according to the heat mass of the rotation angle phase of the circumferential surface 10 of the workpiece W, so that the semi-loop type work coil C heats the circumferential surface 10 as shown in FIG. 4 a1b. A uniform entry width W3 or hardened layer depth can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a first embodiment in which a cam is used as the interlocking control means according to the present invention, FIG. 2 is an explanatory diagram of a second embodiment in which a pinion gear and a rack are employed as the interlocking control means, and FIG. Diagram a
3 is an explanatory diagram of a state in which unevenness in quenching width occurs with the conventional device, FIG. 3 is an explanatory diagram of a state in which quenching depth is uneven, and FIG. FIG. 4 is an explanatory diagram of a state where the width is made uniform, and FIG. 4 is an explanatory diagram of the state where the hardening depth is made uniform. Explanation of symbols, 1...High frequency oscillator 2...
...Current transformer, 10...Circumferential surface, 11
...Outer circumferential surface, 12...Inner circumferential surface, 2
0... Output balancer, 21... Output control inductor, 22... Induced object, 30...
... Rotation drive device, 40 ... Interlocking control means,
41...Power transmission mechanism, 42...Cam, 43...Followed body, 44...Detector,
45...Controller, 46...Variable speed reversible motor, 47...Zenion tooth L 48----
--Rack, C...Work coil, W...
...Work, Wl...Shaft, W2...
hole.

Claims (1)

[Claims for Utility Model Registration] 1 Work W with different heat mass in rotation angle phase
In this apparatus, the circumferential surface 10 of a workpiece W is rotated by a work coil C while receiving an output from a high frequency oscillator 1 via a current transformer 2 and controlled by an output balancer 20 to perform high frequency induction heating. The guided body 22 is controlled to the output control inductor 21 constituting the balancer 20 via the motion control means 40 interlocked with the rotational drive device 30 that rotationally drives the workpiece W on the circumferential surface 10.
A device for high-frequency induction heating of different circumferential surfaces of a heat mass, characterized in that the heat mass is moved forward and backward to adjust the output according to the rotation angle phase of the heat mass. 2 The circumferential surface 10 is the outer circumferential surface 1 of the shaft portion W1 of the workpiece W.
1. The device according to claim 1 of the utility model registration claim 1. 3 The above circumferential surface 10 is the inner circumferential surface 12 of the hole W2 of the workpiece W.
The device according to claim 1 of the utility model registration claim. 4. A utility model registration claim in which the interlocking control means 40 includes a power transmission mechanism 41 that is rotationally driven by a rotary drive device 30, a cam 42 that is connected to the mechanism 41, and a driven body 43 that is driven by the cam 2. The device according to item 1. 5 The interlocking control means 40 includes a detector 44 that detects the rotational angle phase of the circumferential surface 10, a controller 45 that transmits a control signal based on the output signal of the detector 44, and a controller 45 that transmits a control signal based on the output signal of the detector 44, and detects the rotational speed and rotational direction based on the control signal. Variable speed reversible motor 46 that changes
The apparatus according to claim 1, comprising: a pinion gear 47 driven by the motor 46; and a rack 48 meshing with the gear 47.