JPH01259130A - Automatic control method for crankshaft induction quenching water position - Google Patents

Abstract

PURPOSE:To minimize the bending of a crank shaft which arises at the time of putting the shaft into water by using a dog fixed to the rotating shaft of a hardening device and a proximity sensor provided to the hardening device and adjusting the position of the crank shaft in the rotating direction thereof at the time of putting of the shaft into the water to a desire posture to enter the water. CONSTITUTION:The dog 1 is fixed to the rotating shaft 4 which rotates the crank shaft 2 in a hardening coil 3 and a chuck 5 is fixed to the shaft 4. The chuck 5 chucks the crank shaft 2 in such a manner that said shaft has the posture having a specified relation with the dog 1 on the basis of the key groove 6 at the front end of the shaft 2. The proximity sensor 7 is provided to the outside circumference of the dog 1. The sensor 7 detects the moment when the dog 1 moves and the sensor 7 detaches therefrom as the shaft 4 rotates. The position of the crank shaft 2 in the rotating direction thereof is so set as to attain the desirable posture to enter the water by using the dog 1 and the sensor 7 in this constitution. The bending quantity and direction of the shaft 2 by the hardening are thereby stabilized and the quality is improved.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to automatic control of the orientation of the crankshaft induction quenching water in an Erotherm type crankshaft induction hardening device. We decided to set the direction of rotation of the shaft when entering the water so that it would have a desirable entry position. The present invention relates to an automatic control method for the crankshaft induction hardening water position.

(Conventional technology) As for the conventional technology, 9 workers assumed the position of the crankshaft entering the water immediately after the end of heating, and determined the timing to start heating by taking into account the rotation angle of the crankshaft during the heating time. A method that relies on intuition is generally used.

(Problems to be Solved by the Invention) In the conventional apparatus, it is difficult to always keep the crankshaft in the water at an appropriate position immediately after heating.

Since it depends on the intuition of the operator, the amount and direction of bending during hardening cannot be stabilized, which is an obstacle to increasing the productivity of crankshafts. This is a necessary problem.

This invention aims to solve the above problems.

(Means and effects for solving the problem) The present invention has been made in view of the above points, and includes a dog fixed to the rotation axis of the quenching device and a quenching device in automatic control of the crankshaft induction quenching water position. By detecting the rotational angular position of the dog using a proximity sensor provided in the engine, a timer is operated so that the crankshaft enters the water at a predetermined angular position.

Even if the heating button is turned on at any rotational angle position of the crankshaft, the device can be controlled to take a desirable water entry position after heating.

In this way, the present invention provides a method for automatically controlling the crankshaft induction hardening water position that solves the above-mentioned problems.

(Example) Next, an example of the present invention will be described based on the drawings. 1st
The figure shows a sectional view of an embodiment of the present invention, and FIG. 2 shows a view seen from the direction A in FIG. 1. FIG. 3 is an explanatory diagram of the breakdown of the time from when the heating button is turned on until the start of water entry.

In FIG. 1, reference numeral 1 indicates a dog, and the barb 1 is fixed to a rotating shaft 4 that rotates a crankshaft 2 within a hardening coil 3. A chuck 5 is fixed to the rotating shaft 4. The crankshaft 2 is chucked so that the attitude of the crankshaft 2 is in a constant relationship with respect to the dog 1 with reference to the keyway 6 at the tip of the crankshaft 2. A proximity sensor 7 is provided on the outer periphery of the dog 1 and is fixed to a hardening device 8.

The proximity sensor 7 detects the moment when the dog 1 moves according to the rotation of the rotation axis 4 and the two proximity sensors 7 are separated.

FIG. 2 shows the relative positions of the dog 1, the proximity sensor 7, and the crankshaft 2, in this embodiment.

When the center position of the crank pin 9 of the first cylinder is at the top dead center, the proximity sensor 7 is installed on the line connecting the center of the crankshaft 2 and the center of the first cylinder pin 9, and the dog l is placed on the center line of the semicircle. is positioned so that it coincides with the center of the crank bin 9 and the center line of the proximity sensor 7, and this positional relationship will be described as the rotation angle position of the crankshaft 2 or a position rotated by 90 degrees from the reference position. That is, the proximity sensor 7
assume that it is detected that the dog 1 has left when it has rotated 180° from the reference position at the crank rotation angle. Since the rotation shaft 4 rotates at a constant rotation speed, the rotation angle of the crankshaft 2 can be converted into time.

In FIG. 3, α indicates the time when the presence of the dog 1 is confirmed by the proximity sensor 7, and the two dots indicate the time value when the proximity sensor 7 detects the moment when the dog 1 leaves. T is 1 of crankshaft 2
The time required for rotation is shown, and δ is the heating time for hardening the journal portion 10 of the crankshaft 2. FIG. 4 shows a desirable posture immediately after the end of quenching heating, and this posture is representatively shown by the crank rotation angle from the reference point.

In Fig. 3, θ is the conversion time of angle A and is θ-A x r
/360.

In FIG. 3, the crank rotation angle is shown above the base line, B shows the heating start point crank rotation angle, and A shows the crank rotation angular position in the state shown in FIG. β is calculated based on the time value at which the proximity sensor 7 detects the moment when the dog 1 leaves the dog 1, using the heating time δ and the time θ corresponding to 8 of the desired posture, and is calculated in advance by the timer of the hardening device 8 (Fig. (not shown).

As a result, even if the heating button of the hardening device 8 is turned on (ON) at an arbitrary crank angle position, the crankshaft 2 can be controlled to the desired posture A immediately after heating is completed.

By allowing the quenching liquid 11 to enter water from this posture A, the occurrence of bending due to quenching was suppressed. A crankshaft hardening method has been achieved.

(Effects of the Invention) The present invention is constructed as described above, and in automatic control of the crankshaft cylinder frequency quenching water posture, the rotation axis of the quenching device and the crankshaft are positioned so as to pass through the crankshaft, and a dog is placed on the rotation axis. By detecting the rotation angle position of the dog using a proximity sensor installed in the hardening equipment, a timer is operated to bring the crankshaft to a predetermined water entry angle position, and the crankshaft is rotated at any rotation angle. Even if the heating button is turned on at about 1η, the water can be controlled to take a desirable water entry position after heating. Therefore, the amount of bending and the direction of bending due to quenching are stabilized, and it is possible to improve productivity in crankshaft processing and product quality of the crankshaft.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an embodiment of the invention. Figure 2 shows an explanatory diagram seen from the direction A in Figure 1, and
The figure shows an explanatory diagram showing a breakdown of the time from turning on the heating button to the start of water entry, and FIG. 4 is an explanatory diagram showing a desirable posture of the crankshaft immediately after the end of quenching heating. 1...dog, 2...crankshaft. 3... Quenched coil, 4... Rotating shaft. 5... Chuck, 6... Keyway. 7... Proximity sensor, 8... Hardening device. 9... Crank pin, 10... Journal section. 11...Quenching liquid.

Claims (1)

[Claims] In the automatic control of the crankshaft induction hardening water position,
In order to minimize the bending that occurs during quenching, a dog fixed to the rotation axis of the quenching machine and a proximity sensor installed in the quenching machine are used to adjust the rotational position of the crankshaft to the desired water entry position when the crankshaft enters the water. A method for automatically controlling a crankshaft induction quenching water position, characterized by setting the position as follows.