JPS60152623A - Centering method of coil in high-frequency hardening device - Google Patents

Abstract

PURPOSE:To center easily and exactly a coil by using a jig for measuring a clearance having a dial gage as a means for measuring linear displacement attached to one end of a shaft penetrating through a jig body as a main constituting element. CONSTITUTION:While a V-shaped contactor 15 is held across a work 1, a coil 23 is moved in the direction intersection the axial line direction of a spindle 13b and the axial line of the spindle 13b is directed toward the central direction of the bore of the coil 23. The contactor 15 is thereafter pressed to the work 1 in such a way that the spindle 13b is displaced to a prescribed extent and while the contactor is held across the work, the coil 23 is moved in the axial line direction of the spindle 13b. The sum of the two measured values of the dial gage 13 when the inside circumferential surfaces of the coil 23 facing with each other with the center of the inside diameter in-between contact respectively the work 1 is determined. The coil 23 is moved in the axial direction of the spindle 13b until the value measured with the dial gage 13 attains the value of half the previously determined sum. The coil 23 is thus centered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for centering a coil in an induction hardening device used for surface hardening treatment of crankshafts and steering gears in automobiles, for example.

In the induction hardening equipment, the coil for induction hardening is centered so that its inner circumference is positioned at a constant distance from the outer circumference of the workpiece, and then a high-frequency current is passed through the coil. By doing this, the surface of the workpiece is rapidly cooled with water or oil while being heated by high-frequency induction, and a hardened layer is formed on the surface of the workpiece.

By the way, in such induction hardening equipment, it is required to accurately center the coil with respect to the workpiece in order to prevent uneven heating of the workpiece, melt penetration, and spark loss of the coil due to contact between the workpiece and the coil. Ru.

Therefore, the conventional coil centering method will be briefly explained with reference to FIGS. 1 and 2. A cylindrical workpiece 1 is
After both ends of the coil are supported horizontally by the center 2, the upper and lower molds 3a and 3b of the coil 6 are engaged so as to surround the workpiece 1, and the upper and lower handles 4 are rotated to move the coil 6 in the arrow direction. In the Z direction, the inner diameter part 3c is the outer diameter part 1a of the workpiece 1.
The rotation speed or rotation angle of the upper and lower handle 4 at that time is read, and half of the read value is returned in the opposite direction to the final rotation direction.

Next, after performing the same operation by rotating the front and rear handle 5 that moves the coil 3 back and forth in the direction of arrow X, while visually observing the gap A shown in FIG. The centering of the coil 3 is performed by slightly moving the upper and lower handles 3 and 4 and the front and rear handles 5 so that it is evenly spaced.

However, in such conventional coil centering methods, the operator judges changes in the rotational force of the upper and lower handles and the front and rear handles, detects contact between the coil and the workpiece, and then rotates both handles. Since it is necessary to memorize the angular position of the end and visually determine approximately half of the rotation angle,
Not only is it not easy to work, it requires the skill of the operator, and it often causes misalignment, resulting in defective products due to uneven firing or welding, and the coil burns out due to sparks caused by contact between the coil and the workpiece. Such inconveniences may occur.

1-Viper This invention was made in view of the above points.

The object of the present invention is to enable easy and accurate centering of a coil without requiring any skill.

Toyota: Therefore, in the method for centering the coil in the induction hardening device according to the present invention, a V-shaped contactor having a V-shaped groove at the tip of a rod-shaped measuring element is measured so that the bisector of the apex angle of the V-shaped groove is measured. After attaching the linear displacement measuring device to the coil so that it rotates around a point on the probe axis, the linear displacement measuring device is attached so that it is aligned with the probe axis. Move the gauge head in a direction that intersects with the gauge head axis to direct the gauge head axis toward the center of the inner diameter of the coil, and then press the V-shaped contact against the workpiece so that the gauge head is displaced by a predetermined amount to straddle it. In this state, move the coil in the axial direction of the gauge head, calculate the sum of the two measured values of the linear displacement measuring device when the inner peripheral surfaces of the coils facing each other with the center of the inner diameter are in contact with the workpiece, and calculate the straight line. The coil is centered by moving the coil in the axial direction of the probe until the measured value of the displacement measuring device becomes half of the sum.

Lost ULUi Hereinafter, the present invention will be described in detail with reference to FIGS. 3 to 5 of the accompanying drawings.

6 and 4 are front and side views showing a clearance measuring jig used in the present invention, and FIG. 5 is a front view of an induction hardening apparatus to which the clearance measuring jig is attached.

In these figures, the main components of the measuring jig 10 are a jig main body 11 and a dial gauge 13 as a linear displacement measuring device attached to one end of a shaft 12 passing through the jig main body 11.

The stem 1!1a of the dial gauge 13 is the shaft 12
The screw 14 is inserted into the through hole 12a so as to be slidable up and down.
It can be fixed in any position. Spindle 1 as a rod-shaped measuring point of dial gauge 13
3b has a V-shaped contact 1 having a V-shaped groove 15a.
5 is attached so that the bisector B of the apex angle α of the ■-shaped groove 15a coincides with the axis of the spindle 13a.

The jig body 11 and the shaft 12 are rotatable with respect to each other, and both have a collar 16.1 fixed to the shaft 12.
Removal is stopped by 6'.

A clamper part 11a is provided at the lower part of the jig body 11 for fixing the jig body 11 to the upper mold 23a of the coil 23 by a crank bolt 17, and an angle scale plate 18 is provided at the upper part of the clamper part 11a for fixing the jig body 11 to the upper die 23a of the coil 23 by a crank bolt 17. The center line of the direction is fixed so as to be located on the axis of the shaft 12.

An angle indicator 1S is attached to the collar 16 that moves together with the shaft 12 so as to be parallel to the axis of the spindle 13b of the dial gauge 16 and perpendicular to the axis of the shaft 12. The center line in the longitudinal direction is set as the 0 point, and scales 18a are carved at equal intervals on both sides of the 0 point.

On the other hand, a groove 23d for fixing the jig body 11 is formed in the upper die 23a of the coil 23, and the clamper portion 11a of the jig body 11 is fitted into this groove 23d.
When fixed with the crank bolt 17, the plane including the axis of the shaft 12 and the longitudinal center line of the angle scale plate 18 becomes
It passes through the inner diameter center C of the inner diameter portion 23c of the coil 23 which is made up of the upper mold 23a and the lower mold 23b.

A method for centering the coil 23 for induction hardening using the clearance measuring jig 10 having the above configuration will be explained step by step.

(1) A cylindrical workpiece 1 is supported by both centers 2 while maintaining a horizontal state.

[2] The upper mold 23a and the lower mold 23b are joined together so that the inner diameter portion 23c of the coil surrounds the outer diameter portion 1a of the workpiece 1.

(3) Fit the jig body 11 into the groove 2'5d of the upper mold 23a of the coil 23, fix both with the crank bolt 17, and adjust the screw 14 to fit the V-shaped groove 1 of the V-finger contact 15.
5a over the workpiece 1.

(4) Operate the front and rear handles 5 until the angle indicator needle 1S points to the 0 point on the angle scale plate 18, that is, the axis of the spindle 13b of the dial gauge 13 points toward and coincides with the inner diameter center C of the coil 23. The coil 23 is moved back and forth in the X direction perpendicular to the axial direction of the spindle 13b until the apex angle bisector B of the ■-shaped groove 15a intersects with the inner diameter center C as shown in FIG.

17 = (5) When crossing the V-shaped groove 15a in the step (3),
If the spindle 1'5b serving as a measuring point has been retracted by a predetermined amount, leave it as it is, or if not, loosen the screw 14 and readjust the position of the dial gauge 13 to retract the spindle 13b by a predetermined amount. Later, operate the upper and lower handles 4 to move the coil 23 to the spindle 1!1b.
the inner diameter portion 23.
The scale (measurement value) indicated by the pointer 13c of the dial gauge 13 when the inner circumferential surface of the coil of the lower die 23b contacts the workpiece 1 at step c is read with the pointer 13c stationary.

(6) Operate the vertical handle 4 to lower the coil 23 in the direction of arrow Z2, which is the axial direction of the spindle 1'5b,
Upper mold 23 at inner diameter portion 23c. When the inner circumferential surface of the coil, that is, the surface facing the inner circumferential surface of the coil of the lower die 23b mentioned above with the inner diameter center C in between, comes into contact with the workpiece 1, the scale where the pointer 13c of the dial gauge 1'5 is pointing ( measurement value),
Read with the pointer 13C stopped moving.

8- (7) Add the sum of the scales read in (5) and (6) and divide that number by 2.

(8) Operate the vertical handle 4 to raise or lower the coil 23 in the direction of the arrow Z1 or z2, which is the axial direction of the spindle 13b, so that the pointer 13c of the dial gauge 13 becomes (
Stop operating the handle when you reach the scale calculated in 7).

In this way, the coil 2 can be adjusted without relying on visual intuition.
After performing such centering, by moving the workpiece 1 in the longitudinal direction while passing a high-frequency current through the coil 23, the outer surface of the workpiece 1 can be accurately aligned. It becomes possible to form a high quality hardened surface layer.

When induction hardening a number of workpieces of the same diameter in succession, as long as the dial gauge 13 is attached to the shaft 12 at a constant position, steps (1) and (2) of the above steps can be performed. ), (3), (4),
By repeating <s), the coil 23 can be centered.

Further, in the above embodiment, an example was described in which a mechanical dial gauge was used as the linear displacement measuring device, but the present invention is not limited to this, and an electronic digital linear gauge may also be used.

If you use this electronic digital linear gauge, by using the digital measurement value, (7)
It becomes possible to create a configuration that automatically calculates the process.

As described above, according to the method for centering a coil in an induction hardening device according to the present invention, there is no need to rely on visual intuition as in the past, so the work for centering a coil can be done as easily as in the past. It can be done easily and quickly without requiring any skill.

Therefore, it becomes possible to standardize work, and productivity can be greatly improved.

In addition, since extremely accurate centering is possible, there is no uneven heating or melt penetration during induction hardening, which significantly improves the quality of the product, and also has the excellent effect of avoiding coil burnout due to sparks. play.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional method for centering a coil in an induction hardening device, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
A front view showing the clearance measuring jig used in the present invention, FIG. 4 is a side view thereof, and FIG. 5 is a front view of an induction hardening apparatus equipped with the clearance measuring jig shown in FIGS. 3 and 4. It is a diagram. 1... Work 3, 23... Coil 4... Upper and lower handles 5... Front and rear handles 10... Clearance measuring jig 11... Jig body 12... Shaft 13... Dial gauge (Linear displacement measuring instrument) 15... V-type connector 15a... V-shaped groove IS... Angle indicator needle Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 After centering a coil for induction hardening so that its inner circumference is positioned with a constant gap from the outer circumference of the workpiece, the outer circumferential surface of the workpiece is hardened by high-frequency induction heating by the coil. In the induction hardening device, a V-shaped contactor having a V-shaped groove is attached to the tip of a rod-shaped gauge head so that the bisector of the apex angle of the ■-shaped groove coincides with the axis of the gauge head. After attaching the measuring device to the coil so as to rotate around a point on the axis of the probe, the coil is moved in the direction of the axis of the probe with the V-shaped contact straddling the workpiece. to direct the probe axis toward the inner diameter center of the coil, and then move the V-shaped contactor to the workpiece,
With the gauge head pressed and straddled so as to be displaced by a predetermined amount, the coils are moved in the axial direction of the gauge head so that the inner circumferential surfaces of the coils facing each other with the center of the inner diameter are in contact with the workpiece. Calculate the sum of the two measured values of the linear displacement measuring device when they touch each other, and move the coil in the axial direction of the measuring stylus until the measured value of the linear displacement measuring device becomes half of the calculated sum. A method for centering a coil in an induction hardening apparatus, comprising centering the coil by moving the coil.