JPH09316529A - Shifting quenching method and device for supporting material used to it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the surface deformation accompanied with supporting of a long material by surely supporting the long material, in a shifting quenching of the long material. SOLUTION: The long material 10 is horizontally supported at plural positions. In each supporting position, one pair of roller units 20a, 20b at the front and the rear parts are arranged. In each roller unit, a receiving roller is elasticity supported. When the heating part of the long material 10 passes above the roller unit 20a, the receiving roller in the roller unit 20b is made descendable and the long material 10 is supported with the receiving roller in the roller unit 20b. When the heating part of the long material 10 completes to pass above the roller unit 20a, the receiving roller in the roller unit 20a is made undescendable and the receiving roller in the roller unit 20b is made descendable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving hardening method used for surface hardening of a long material having a circular cross section such as a ball screw, and a material supporting device used for the method.

[0002]

2. Description of the Related Art A method called horizontal displacement hardening is often used for surface hardening of a long material such as a ball screw having a circular cross section. A conventional horizontal movement quenching method for a ball screw will be described with reference to FIG.

First, a ball screw 1 is placed on a plurality of roller units 1, 1, ...
Place 0 horizontally. Each roller unit 1 rotatably supports the ball screw 10 by a roller pair. Then, the chuck 2 holds the ball screw 10 and rotates the ball screw 10 in the circumferential direction. Then, the induction heating coil 3 facing the ball screw 10 from above is attached to the ball screw 10
Of the cooling liquid jetting jacket 4 that moves from one end to the other end in the longitudinal direction of the
Are moved subsequently to the induction heating coil 3.

Due to the movement of the induction heating coil 3, the outer surface of the ball screw 10 is sequentially heated from one end to the other end, and the ball screw 1 is moved from the cooling liquid jetting jacket 4 which moves subsequently.
By injecting the cooling liquid onto the outer surface of 0, the outer surface is sequentially quenched. In other words, the heating portion of a certain length formed on the outer surface of the ball screw 10 moves in the longitudinal direction,
Quenching is performed. As the induction heating coil 3,
A line coil called a semi-open saddle type is usually used.

[0005]

By the way, the large ball screw 10 has an outer diameter of 70 to 80 mm, a length of several meters, and a weight of more than 200 kg. When such a large ball screw 10 is hardened, the roller units 1, 1 ...
Is indispensable, but on the other hand, due to the weight of the ball screw 10 and expansion due to heating, the ball screw 10
The outer surface of is strongly pressed against the roller pair of the roller unit 1. At this time, the outer surface of the ball screw 10 is softened by heating, so that the mountain portion of the outer surface is deformed, and as a result, the groove is deformed.

The deformation of the groove portion due to the roller support is
The heavier the ball screw 10 is, and the narrower the width of the crest portion is, like the transfer screw, the more likely it is to occur. When this deformation occurs, it is necessary to correct it by polishing or the like as a post-process, which leads to an increase in man-hours. Also, if you do not modify,
It cannot be used as a product.

The present invention was devised in view of the above circumstances, and reliably supports a long and heavy material such as a large ball screw to suppress distortion caused by quenching and to support it. It is an object of the present invention to provide a moving quenching method and a material supporting device capable of suppressing surface deformation due to heat treatment.

[0008]

According to the moving quenching method of the present invention, a long member having a circular cross section is horizontally supported from below by a roller unit at a plurality of longitudinal positions.
In this state, while rotating the long material in the circumferential direction, the induction heating coil facing the long material from above is moved in the longitudinal direction of the long material, and the induction heating coil is continuously moved from above to the long material. In the horizontal movement quenching method for a long material, in which the heating portion of the long material is moved in the longitudinal direction of the material by moving the opposing cooling liquid injection jackets in the longitudinal direction of the material, each support position of the material. , Two roller units are arranged at intervals in the longitudinal direction of the long material, and when the heating unit passes over one roller unit, the support by one roller unit is stopped and the other roller unit is stopped. The long member is supported by the unit, and when the heating unit passes over the other roller unit, the support by the other roller unit is stopped and the long member is supported by the one roller unit. That.

Further, in the material supporting apparatus according to the present invention, a long member having a circular cross section is horizontally supported rotatably from below by a roller unit at a plurality of positions in the longitudinal direction, and in this state, the long member is circumferentially supported. While rotating, the induction heating coil facing the long material from above is moved in the longitudinal direction of the long material, and the cooling liquid injection jacket facing the long material from above is also attached to the long material, following the induction heating coil. Is a material supporting device used for horizontal movement quenching of a long material to be moved in the longitudinal direction of the long material, and two material supporting devices are provided at each supporting position of the long material at intervals in the longitudinal direction of the long material. A roller unit and an operation switching mechanism that is provided for each supporting position of the long material and switches the operation of two roller units arranged at each supporting position, and is arranged at each supporting position of the long material. Two roller units Each of them has a pair of rollers supported so as to be able to move up and down, and an elastic member that elastically supports the pair of rollers, and an operation switching mechanism that switches the operations of the two roller units corresponds to the two roller units. Is provided,
Each of the roller units has a pair of descending blocking members that enter and exit below the roller pair and block the roller pair from descending when positioned below the roller pair.

The pair of lowering prevention members are arranged between the two roller units and are connected to each other, and when the connecting member moves to the side of one roller unit, the lowering prevention member on that side causes the lowering prevention member to move. The roller pair is located below the roller pair in the unit to prevent the roller pair from descending, and the opposite-side descending prevention member slips out from below the roller pair in the roller unit to allow the roller pair to descend, and the connecting member is arranged to move downward. When moving to the roller unit side, the lowering prevention member on that side is positioned below the roller pair in the roller unit to prevent the lowering of the roller pair, and the lowering prevention member on the opposite side is in the roller unit. It is desirable to have a configuration that allows the pair of rollers to come out from the lower side of the pair of rollers and descend.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an implementation procedure and equipment configuration for implementation of an example of a moving and quenching method according to the present invention, and FIG. 2 is a side view showing the configuration of an example of a material supporting device according to the present invention. FIG. 3, FIG. 3 is a plan view of the same material support device, FIG. 4 is a front view of the same material support device, FIG. 5 is a side view showing an operation switching mechanism of the same material support device, and FIG.
FIG. 4 is a plan view of the operation switching mechanism.

As shown in FIG. 1, the quenching equipment comprises a material support device for horizontally supporting a long material 10 such as a ball screw as a material to be hardened rotatably, and a chuck for rotating the long material 10. 2. The induction heating coil 3, which is a quenching device, and the cooling liquid injection jacket 4 are provided. Since the device except the material supporting device is the same as the conventional device, detailed description will be omitted. The induction heating coil 3 is a half-open saddle type line coil that faces the horizontally supported long member 10 from above.

Here, the material supporting device basically supports the long member 10 at three horizontal positions as in the conventional device shown in FIG. 7, but each supporting position is different from the conventional device. A pair of front and rear roller units 20a, 20b and an operation switching mechanism 30 for switching the operation thereof are provided. Here, the distance between the roller units 20a and 20b is
It is set to be larger than the distance from the induction heating coil 3 to the cooling liquid injection jacket 4.

The roller units 20a and 20b have basically the same structure. In each roller unit, as shown in FIG.
As shown in FIG. 4, a pair of left and right receiving rollers 21, 21
Are rotatably supported by horizontal shafts 23 attached to both end portions of the support frame 22 via metal bearings. The left and right receiving rollers 21 and 21 are displaced in the axial direction here as shown in FIG. 3, but this is for the purpose of not obstructing the injection of the cooling liquid and for promoting the discharge.
On both sides of the support frame 22, cylindrical guide sleeves 24, 24 extending downward are integrally provided.
The guide sleeves 24, 24 are fitted onto a pair of left and right guide posts 26, 26 erected on the base plate 25 via metal bearings. Therefore, the support frame 22 can be raised and lowered.

The support frame 22 also includes the guide posts 2
It is elastically supported by a coil spring 27 which is vertically arranged between 6, 6 and is held at a predetermined level by stoppers on both sides (not shown). Then, with the support frame 22 being held at a predetermined level, a predetermined gap is formed between the support frame 22 and the base plate 25 therebelow. In addition, 28 is a bolt for preventing the horizontal shaft 23 from coming off, and 29 is a post standing upright on the base plate 25 for supporting the coil spring 27.

The operation switching mechanism 30 for switching the operation states of the roller units 20a and 20b comprises the roller unit 2
It is arranged between 0a and 20b. As shown in FIGS. 5 and 6, the operation switching mechanism 30 has a pair of front and rear lowering prevention members 31a and 31b mounted on the base plates 25 and 25 of the roller units 20a and 20b. The lowering prevention members 31a and 31b are connected by a horizontal connecting member 33, and the connecting member 33 is moved in the longitudinal direction by the operation of a lever 34, so that the guides 32 and 32 on both sides are guided over the base plates 25 and 25. Being synchronized, it moves back and forth.

Here, the lever 34 includes the base plates 25, 2
A vertical shaft 36 is rotatably supported on a gantry 35 provided between the members 5, and the tip end is connected to a connecting member 33 by a vertical pin 37. Therefore, when the lever 34 is operated to the right side in the figure, the connecting member 33 moves toward the downstream roller unit 20a, and when operated in the opposite direction, the connecting member 33 moves toward the upstream roller unit 20b. The length of the connecting member 33 is set as follows in relation to its operation.

The roller unit 2 in which the connecting member 33 is located on the downstream side
When it moves toward 0a, the downstream blocking member 31a moves downstream. The lowering prevention member 31a that has moved to the guide posts 26, 26 is inserted between the support frame 22 and the base plate 25 therebelow, and prevents the support frame 22 from lowering. At this time, the lowering prevention member 31b on the upstream side includes the support frame 22 and the base plate 2 therebelow.
5 and the support frame 22 is allowed to descend completely.

The connecting member 33 has an upstream roller unit 2
When it moves toward 0b, the downstream-side lowering prevention member 3
1a completely comes out from between the support frame 22 and the base plate 25 therebelow, and allows the support frame 22 to descend. On the other hand, the downward blocking member 31b on the upstream side is inserted between the support frame 22 and the base plate 25 therebelow,
The lowering of the support frame 22 is prevented.

In quenching, the induction heating coil 3 is connected to one end of the long material 10 while the long material 10 is horizontally supported by the chuck 2 while the long material 10 is being circumferentially supported by the chuck 2. To the other end, and the cooling liquid jetting jacket 4 is moved subsequently to the induction heating coil 3.

At the start of quenching, as shown in FIG. 1A, the connecting member 33 is moved to the upstream side at any of the three supporting positions. Therefore, in the roller unit 20a on the downstream side, the lowering prevention member 31a is pulled out from between the support frame 22 and the base plate 25 therebelow, and the support frame 22 can be lowered, and the roller unit b on the upstream side. Is the support frame 22
The lowering prevention member 31a is inserted between the base plate 25 and the base plate 25 therebelow, so that the support frame 22 cannot be lowered.

When the induction heating coil 3 comes on the roller unit 20a on the downstream side at the supporting position of the first stage, the material on the roller unit 20a is heated. But,
In the roller unit 20a on the downstream side, since the support frame 22 can be lowered, even if the heating portion is lowered due to the weight of the long material 10 or expansion due to heating, the receiving rollers 21 and 21 are correspondingly moved. Go down. Therefore, long material 1
A situation in which the outer surface of 0 is strongly pressed against the receiving rollers 21 and 21 is avoided. Therefore, the outer surface of the long material 10 is prevented from being deformed, and when the long material 10 is a ball screw, the groove portion is prevented from being damaged due to the deformation of the mountain portion.

At this time, the upstream roller unit 20b
In the above, since the support frame 22 cannot be lowered and the material is not heated, the long material 10 is reliably supported even in the first-stage support position.

The distance between the roller units 20a and 20b is
Since it is set to be larger than the distance from the induction heating coil 3 to the cooling liquid jetting jacket 4, before the induction heating coil 3 reaches the upstream roller unit 20b, the cooling is performed on the downstream roller unit 20a. The liquid jet jacket 4 reaches and the material on the roller unit 20a is rapidly cooled.

When the material on the roller unit 20a is rapidly cooled, the connecting member 33 is moved to the downstream side, as shown in FIG. 1 (b). As a result, the support frame 22 cannot be lowered in the roller unit 20a on the downstream side, and instead, the support frame 22 can be lowered in the roller unit 20b on the upstream side. As a result, in the roller unit 20a on the downstream side, the quenched portion of the long material 10 is reliably supported by the receiving rollers 21 and 21. On the other hand, in the roller unit 20b on the upstream side,
The material on it is heated, but even if the heating portion goes down due to the weight of the long material 10 or expansion due to heating, the receiving roller 2
Since the Nos. 1 and 21 are lowered, the situation where the outer surface of the long member 10 is strongly pressed against the receiving rollers 21 and 21 is avoided.

Even in the second and third supporting positions, as shown in FIGS. 1A and 1B, the heating portion of the long material 10 is connected to the roller unit 20a as in the first supporting position. By moving the connecting member 33 after passing over
Switching between support and non-support by the roller units 20a and 20b is performed.

In this way, the long material 10 is always reliably supported at the three positions to suppress the distortion caused by quenching and suppress the surface deformation caused by the support.

Switching between supporting and non-supporting by the roller units 20a and 20b can be performed by forcibly raising and lowering the receiving rollers 21 and 21 by a cylinder or the like, but when the cylinder is an air cylinder, a large force is generated. Since it is necessary to increase the diameter, the device becomes larger. Further, if the cylinder is a hydraulic type, it is possible to avoid an increase in size, but a separate hydraulic device is required, and the device price increases.

On the other hand, in the above-mentioned material supporting device, the descending of the elastically supported receiving rollers 21 and 21 is prevented by the spacer-like lowering preventing member 31, and the receiving rollers 21 and 21.
Since 21 is not forcibly moved up and down, it is small and inexpensive. Moreover, since the pair of lowering prevention members 31 and 31 are connected and the opposite operations are performed in synchronization, the operation is easy and the synchronization mechanism is simple.

Although the supporting position of the long material 10 is set to three in the above-mentioned embodiment, this is a matter which is appropriately selected according to the size of the long material 10 and the like, and is not limited to three. Needless to say.

[0031]

As described above, in the moving quenching method according to the present invention, two roller units are arranged at each supporting position of the long material at intervals in the longitudinal direction of the long material, and When the heating unit passes over the roller unit of, the support by one roller unit is stopped and the long material is supported by the other roller unit, and when the heating unit passes over the other roller unit. Since the support by the other roller unit is stopped and the long material is supported by the one roller unit, even for a long and long material such as a large ball screw, it is surely supported and baked. It is possible to suppress the distortion caused by the insertion and the surface deformation caused by the support.

Further, the material supporting device according to the present invention includes a roller unit arranged at each supporting position of the long material, two roller units arranged at intervals in the longitudinal direction of the long material, and each support of the long material. An operation switching mechanism that is provided for each position and switches the operation of the two roller units arranged at each support position, and the two roller units arranged at each support position of the long material are both It has a pair of rollers supported so as to be able to move up and down, and an elastic member that elastically supports the pair of rollers.
An operation switching mechanism that switches the operation of one roller unit is provided corresponding to the two roller units, and each roller unit moves in and out below the roller pair in the corresponding roller unit, and is positioned below the roller pair. Since it has a pair of lowering prevention members for preventing the lowering of the roller, when the heating portion passes over one roller unit, the support by one roller unit is stopped,
It is possible to support the long material by the other roller unit, and when the heating section passes over the other roller unit, stop the support by the other roller unit and support the long material by the one roller unit. it can. Therefore,
Even for long and long materials such as large ball screws,
This is surely supported to suppress distortion due to quenching,
Surface deformation due to the support can be suppressed. Also,
The device is small and inexpensive because it does not require a forced lifting mechanism for the roller pair.

[Brief description of drawings]

FIG. 1 shows an example of a moving and quenching method according to the present invention.
It is a schematic diagram which shows the implementation procedure and the equipment structure for implementation.

FIG. 2 is a side view showing the configuration of an example of a material support device according to the present invention.

FIG. 3 is a plan view of the material support device.

FIG. 4 is a front view of the material support device.

FIG. 5 is a side view showing an operation switching mechanism of the material supporting apparatus.

FIG. 6 is a plan view of the operation switching mechanism.

FIG. 7 is a schematic diagram showing a conventional moving quenching method.

[Explanation of symbols]

 10 Long Material (Ball Screw) 20a, 20b Roller Unit 21 Receiving Roller 22 Support Frame 27 Coil Spring (Elastic Member) 30 Action Switching Mechanism 31a, 31b Downward Preventing Member 33 Connecting Member 34 Lever

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication C21D 9/00 9542-4K C21D 9/00 A 9/28 9/28 A

Claims (3)

[Claims] 1. A long member having a circular cross section is horizontally supported from below by a roller unit at a plurality of positions in the longitudinal direction, and in this state, the long member is rotated circumferentially to form a long member. By moving the opposing induction heating coil from above in the longitudinal direction of the long material, and following the induction heating coil, moving the cooling liquid injection jacket facing the elongated material from above in the longitudinal direction of the elongated material. In the horizontal moving and quenching method of the long material in which the heating part of the long material is moved in the longitudinal direction of the material, two roller units are provided at each supporting position of the long material at intervals in the longitudinal direction of the long material. When the heating unit passes over one roller unit, the support by one roller unit is stopped, the long material is supported by the other roller unit, and the heating unit is over the other roller unit. Passes through Kiniwa, stop the support by the other roller units, mobile quenching method characterized by supporting the long material by one of the roller unit. 2. A long member having a circular cross section is horizontally supported rotatably from below by a roller unit at a plurality of longitudinal positions, and in this state, the long member is rotated in the circumferential direction to form a long member. Along with moving the induction heating coil facing from the upper side in the longitudinal direction of the long material, and moving the cooling liquid injection jacket facing the long material from above in the longitudinal direction of the long material, following the induction heating coil. A material supporting device used for horizontal moving and quenching of a material, comprising two roller units arranged at respective supporting positions of the elongated material at intervals in the longitudinal direction of the elongated material, and an elongated material. And an operation switching mechanism that is provided for each of the supporting positions of the long material and that switches the operation of the two roller units arranged at the supporting positions. Both are supported so that they can be raised and lowered. An operation switching mechanism that has a roller pair and an elastic member that elastically supports the roller pair, and that switches the operation of the two roller units is provided corresponding to the two roller units, and each of the roller units has a corresponding roller unit. A material support device comprising: a pair of descending blocking members that enter and exit below a pair of rollers and that prevent the pair of rollers from descending when positioned below the pair of rollers. 3. A pair of lowering prevention members are arranged between two roller units and connected to each other, and when the connecting member moves to one roller unit side, the lowering prevention member on that side is The roller pair is positioned below the roller pair in the roller unit to prevent the roller pair from descending, and the opposite-side descending prevention member slips out from below the roller pair in the roller unit to allow the roller pair to descend. When it moves to the side of the other roller unit, the lowering prevention member on that side is positioned below the roller pair in the roller unit to prevent the lowering of the roller pair, and the lowering prevention member on the opposite side 3. The material supporting apparatus according to claim 2, wherein the material supporting device is allowed to come out from below the roller pair in the unit to allow the roller pair to descend.