JP3055658B2 - Internal quenching method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface quenching method and apparatus for moving and quenching the inner surface of a groove formed on a workpiece such as a linear motion guide device by high frequency heating.

[0002]

2. Description of the Related Art A linear motion guide device is a long member provided with a groove over its entire length in the longitudinal direction of its surface, and is usually used by quenching the inner surfaces on both sides of the groove. As a method of quenching the inner surface of the groove of the work in which such a groove is formed, there are carburizing quenching and induction hardening.

As shown in FIG. 3, induction hardening is performed on a workpiece.
With the surface 11 on which the ten grooves 12 are formed facing upward,
High frequency heating coil 20 and coolant spray
This is performed by moving the shooting jacket 30. High frequency application
The thermal coil 20 is moved inside the groove 12 on both sides thereof.
The surfaces 13, 13 are induction heated in the longitudinal direction. Coolant jet
The racket 30 is located behind the moving direction of the high-frequency heating coil 20.
The connected coolant is supplied to the nozzle holes 3 on both sides.
1 and is heated by the high-frequency heating coil 20
The inner surfaces 13, 13 of the groove 12 are rapidly cooled.

In the case of a linear motion guide device, quenching is usually performed only on the inner side surfaces 13, 13 on both sides of the groove 12, but depending on the type of work, the inner bottom surface 14 of the groove 12 is also quenched at the same time. There are also things.

[0005]

In the hardening of the inner surface of the groove of the work, there is a serious problem that the work is distorted by the hardening. Specifically, in many cases, the entire work warps in an arc shape so that the surface side of the work in which the groove is formed is depressed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and effectively and easily avoids the accumulation of the cooling liquid in the inside of the groove, thereby reducing the distortion of the work caused by the movement quenching of the inner surface of the groove. It is an object of the present invention to provide an internal quenching method and apparatus that can be reduced.

[0007]

According to the present invention, there is provided an inner surface quenching method, wherein an inner surface of a groove is continuously heated by a high frequency heating coil which relatively moves inside a groove formed on a surface of a work, and a high frequency heating coil is provided. Subsequently, the inner surface of the groove is quenched by a cooling liquid spray jacket that relatively moves inside the groove, and the heating surface of the groove is quenched. The high-frequency heating coil and the cooling liquid jet jacket relatively move inside the inside.

When the high-frequency heating coil and the coolant jetting jacket move relative to each other inside the groove, if the surface of the grooved work is directed downward, the coolant ejected from the coolant jetting jacket will be cooled. Since it does not accumulate inside and the bottom surface is not rapidly cooled, the distortion of the work due to quenching is reduced by the preheating effect of the high-frequency heating coil.

When the high-frequency heating coil and the coolant spray jacket move relative to each other inside the groove, the second coolant moves relatively on the back surface of the work facing upward in synchronization with the coil and the coolant spray jacket. If the back surface of the work is supplementarily cooled by the spray jacket, the heat history on the back surface side of the work is intentionally controlled. By using the second high-frequency heating coil instead of the second cooling liquid spray jacket, the heat history on the back surface side of the work is intentionally controlled. By properly using these according to the shape of the work and the quenching pattern, distortion of the work due to quenching can be freely controlled.

An internal quenching apparatus according to the present invention is an internal quenching apparatus for quenching an inner surface of a groove formed on a surface of a work, wherein the work is directed downward with the surface on which the groove is formed. A work supporting portion for supporting the work in a state, a high-frequency heating coil for relatively moving inside the groove of the work, and a cooling liquid spray jacket for relatively moving inside the groove following the high-frequency heating coil are provided.

When the high-frequency heating coil and the cooling liquid jet jacket move relative to each other, the high-frequency heating coil and the cooling liquid jet jacket move relative to each other in synchronization with the high-frequency heating coil and the cooling liquid jet jacket. Has a second coolant spray jacket for supplementarily cooling the cooling water.

Further, when the high-frequency heating coil and the cooling liquid jetting jacket move relative to each other, the high-frequency heating coil and the cooling liquid jetting jacket move relative to each other in synchronization with the high-frequency heating coil and the cooling liquid jetting jacket. Has a second high-frequency heating coil for auxiliary heating.

It should be noted that the front and back surfaces of a workpiece in this specification do not necessarily mean the front and back surfaces of a product. In the present invention, the surface on which the groove is formed is referred to as a front surface, and the surface on the opposite side is referred to as a back surface. The relative movement of the high-frequency heating coil and the cooling liquid jet jacket means that the work may be moved instead of moving them.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are shown below.
This will be described based on an example. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a schematic explanatory view of the inner surface quenching method and apparatus according to the embodiment,
Internal hardening method and apparatus according to a second embodiment of the present invention
It is a schematic explanatory view of.

[0015] Internal hardening according to a first embodiment of the present invention
The method includes the steps of forming a groove 12 formed on the surface 11 of the workpiece 10.
The groove 12 is formed by the high-frequency heating coil 20 which relatively moves the portion.
Continuously heats the inner surface of the
Subsequently, a coolant jet jacket which moves relatively inside the groove 12 is provided.
The inner surface of the groove 12 for rapidly cooling the heated surface of the groove 12 by
A quenching method, wherein the inside of the groove 12 is
0 and the coolant spray jacket 30 move relative to each other. Ma
In addition, the above-mentioned high circumference
Synchronous with wave heating coil 20 and coolant spray jacket 30
And the second coolant injection jacket 40 relatively moving
To cool the back surface 15 of the work 10 in an auxiliary manner.
ing.

The workpiece 10 has a surface 1 of a rod material having a square cross section.
1 is, for example, a linear motion guide device in which a groove 12 having a substantially square cross section is formed over the entire length. Quenching is performed on the inner surfaces 13, 13 on both sides of the groove 12. During this quenching, the work 10
Is set horizontally at the quenching position with the surface 11 on which the grooves 12 are formed facing downward.

[0017] Internal hardening according to a first embodiment of the present invention
As shown in FIG.
With the groove 11 formed with the surface 11 facing downward.
Work supporting part (not shown) to support in the state, and copper corner
One-turn mobile high-frequency heating coil formed by a tube
20 and a coolant jet jar connected rearward in the moving direction thereof.
On the backside 15 of the workpiece 10 facing upwards
The high frequency heating coil 20 and the cooling liquid spray jacket
30, a second coolant jet jacket that moves relatively in synchronization with
40.

The high-frequency heating coil 20 has a pair of vertical portions 21, 21 facing the inner side surfaces 13, 13 on both sides of the groove 12 (however, the vertical portion 21 on the left side as viewed in the drawing is not shown). The vertical portions 21 and 21 are connected by a horizontal portion 22 below. Vertical part 21, 2
1 are connected to coaxial connecting parts 24 via inclined parts 23, 23 inclined inward and downward, and further connected to a high-frequency power source (not shown) through these connecting parts 24. Connected to lead. The high-frequency heating coil 2
At 0, a core 25 made of a magnetic material such as ferrite is attached to improve quenching efficiency.

The high-frequency heating coil 20 is driven linearly in the direction of the center axis of the coil by a driving mechanism (not shown).

The coolant spray jacket 30 has a length corresponding to the length of the groove 12.
A rectangular container made of insulating material that is flat in the hand direction.
It is connected to the rear side in the moving direction of the coil 20. Of groove 12
Coolant spray jacket 30 facing inner surfaces 13, 13
A plurality of nozzle holes 31 are provided on both side surfaces of
ing. The cooling liquid passes through a supply pipe 32 extending downward.
The coolant is supplied into the coolant spray jacket 30 and the nozzles on both sides are provided.
It is injected from the hole 31 to the inner side surfaces 13, 13 of the groove 12. Ma
In addition, the second cooling liquid spray jacket 40 is formed by
It is a rectangular container made of insulating material that is flat in the direction. And this second
The coolant spray jacket 40 of FIG.
Are formed on the lower surface facing the rear surface 15 where no
A nozzle hole 41 is formed. Coolant extends from above
The second coolant spray jacket through the outlet pipe 42
30 and is ejected from the lower nozzle hole 41,
It collides with the back surface 15 (upper surface) of the work 10. In addition,
The second cooling liquid spray jacket 40 is a high-frequency heating coil.
Mechanically connected to the
Have been. Therefore, the high-frequency heating coil 20 and the coolant injection
Linearly driven in the direction of the coil center axis together with the
It is.

To perform quenching, the high-frequency heating coil 20
Supplying a high-frequency current, and
Do not supply coolant to the second coolant spray jacket 40.
The high-frequency heating coil 20 inside the groove 12 is
This is performed by linear driving in the direction of the center axis.

First, the high-frequency heating coil 20 controls the groove 1
The inner surfaces 13, 13 of the two are induction-heated from one end to the other.

The heated inner surfaces 13 and 13 are immediately cooled immediately by the cooling liquid jetted from the cooling liquid jet jacket 30 moving inside the groove 12 following the high-frequency heating coil 20. Therefore, the inner side surfaces 13, 13 are moved and hardened over the entire length.

At this time, a groove 12 is formed in the work 10.
The facing surface 11 faces downward. Therefore, the coolant injection
Coolant injected from the racket 30 to the inner surfaces 13, 13
Flows out downward without collecting inside the groove 12. So
As a result, overcooling of the inner bottom surface 14 of the groove 12 is avoided,
The work 10 is moved by the preheating effect of the heating coil 20.
Distortion due to dynamic quenching is reduced. Specifically, the groove 12
The workpiece is formed so that the surface 11 side of the formed workpiece 10 is depressed.
In the case where the entire buckle 10 tends to be curved in an arc, the warpage is reduced.
Is done. Also, the second coolant injection jacket 40 is
Frequency heating coil 20 and coolant spray jacket 30
In addition, the workpiece moves linearly in the direction of the coil center axis.
When the inner surface sides 13 and 13 of the groove 12 are quenched, the groove 12
The back surface 15 (upper surface) on which the second cooling liquid is not formed is formed.
The cooling liquid ejected from the shooting jacket 40 assists
Cooled. Then, the second coolant injection jacket 40
By adjusting the amount of coolant discharged from the workpiece,
Is controlled on the back side (upper side). Therefore, the groove
Even if the cooling liquid is prevented from staying in the interior of the pump 12, the distortion can be reduced.
From the front side (lower side) where the groove 12 is formed, to the back side
(Upper side) tends to be insufficiently cooled.
The thermal history control on the back side (top side) by
The distortion associated with the 0 moving quenching is further reduced.

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031]

Next, according to the second embodiment of the present invention,
The case hardening method will be described with reference to FIG.

The internal quenching apparatus is the second type shown in FIG.
An internal quenching apparatus suitable for performing the internal quenching method according to the embodiment of the present invention,
0 is changed to the second high-frequency heating coil 50. The second high-frequency heating coil 50 is a one-turn pin coil formed by a copper square tube, and has a core 52 attached thereto. Such a second high-frequency heating coil 5
Numeral 0 indicates that the heating conductor 51 supplementarily heats the back surface 15 (upper surface) of the work 10 where the grooves 12 are not formed, while moving linearly in the coil center axis direction together with the high-frequency heating coil 20 and the cooling liquid jet jacket 30. .

In order to reduce the distortion by avoiding the accumulation of the cooling liquid inside the groove 12, the surface side (lower side) where the groove 12 is formed is heated more than the rear side (upper side). By controlling the heat history on the back side (upper side) by this heating, the distortion due to the moving quenching of the work 10 is further reduced.

In the example of FIG. 1 and FIG.
Although only 3 and 13 are hardened, the inner bottom surface 14 of the groove 12 is hardened.
The invention can be applied to hardening only or both
It is. Further, the shape of the groove 12 is also limited to a substantially square shape.
Any shape such as U-groove, dovetail groove, etc.
You may. The second coolant injection jacket 40 and the second
For the high frequency heating coil 50 of FIG.
On the frequency heating coil 20 and the coolant spray jacket 30
It is also possible to dispose them on one side and use them properly as appropriate.

[0036]

According to the first aspect of the present invention, there is provided a method for hardening an inner surface.
Frequency heating that moves relative to the inside of the groove formed on the surface
The coil heats the inner surface of the groove continuously,
Coolant injection relative to the inside of the groove following the heating coil
Inner quenching of the groove that cools the heated surface of the groove quickly with the jacket
Facing down the surface of the grooved workpiece.
With the girder in place, the inside of the groove was sprayed with a high-frequency heating coil and coolant.
Work facing upward when the shooting jacket moves relatively
The high-frequency heating coil and the cooling liquid jet
A second coolant jet jacket that moves relatively in synchronization with the bucket
The auxiliary cooling of the back of the work
ing.

Therefore, in the case of this internal quenching method,
Is a high-frequency heating coil and cooling liquid jet jacket
When the tool moves relative to each other, the surface of the grooved workpiece
With the coolant spray jacket facing downward.
The cooling liquid ejected from the tank is immediately discharged out of the groove,
Since the liquid does not accumulate inside the groove, the
The distortion of the work can be reduced by the thermal effect. Ma
Especially with high frequency heating coil and coolant spray jacket
The second coolant that moves synchronously on the back surface of the work
The injection jacket cools the back of the work
So that in addition to discharging the coolant out of the groove,
Since the heat history on the back side of the workpiece is intentionally controlled,
The distortion of the work accompanying the insertion is further reduced.

Further, the inner surface quenching method according to claim 2 is characterized in that
High frequency moving relatively inside the groove formed on the surface of the workpiece
The heating coil continuously heats the inner surface of the groove and
Coolant that moves relatively inside the groove following the frequency heating coil
Inner surface of groove that cools heated surface of groove rapidly by spray jacket
A quenching method in which the surface of the grooved workpiece is
With the high-frequency heating coil and cooling inside the groove
When the liquid jet jacket moves relative to each other,
The high-frequency heating coil and the cooling liquid
A second high-frequency heating core that moves relatively in synchronization with the jacket
To heat the back of the workpiece
ing. For this reason, this internal quenching method
Is a high-frequency heating coil and cooling liquid jet jacket
When the tool moves relative to each other, the surface of the grooved workpiece
With the coolant spray jacket facing downward.
The cooling liquid ejected from the tank is immediately discharged out of the groove,
Since the liquid does not accumulate inside the groove, the
The distortion of the work can be reduced by the thermal effect. Ma
Especially with high frequency heating coil and coolant spray jacket
The second high frequency moving relatively on the back surface of the work synchronously
The heating coil supplementarily heats the back of the work.
The cooling fluid to the outside of the groove,
Since the heat history on the back side of the metal is controlled intentionally,
The accompanying work distortion is further reduced.

Further, according to the third aspect of the present invention,
High circumference that moves relatively inside the groove formed on the surface of the work
With the wave heating coil, the inner surface of the groove is continuously heated,
Cooling that moves relatively inside the groove following the high-frequency heating coil
The inside of the groove that cools the heated surface of the groove quickly by the liquid jet jacket
This is a surface quenching method in which the surface of the grooved workpiece is
With the high-frequency heating coil and cooling
When the repellent injection jacket moves relatively, it faces upward
The high-frequency heating coil and cooling liquid
Second coolant jet that moves relative to the spray jacket
The jacket cools the backside of the work with
Place the high-frequency heating coil and
And the second moving relative to the cooling liquid injection jacket
High-frequency heating coil supplementarily heats the back surface of the work
It is supposed to. For this reason, the second
Using a cooling liquid spray jacket and a second high-frequency heating coil
It is possible to further reduce the distortion of the workpiece by dividing
Can be.

On the other hand, the inner quenching apparatus according to claim 4 is
Inner quenching to quench the inner surface of the groove formed on the surface of the workpiece
An apparatus, comprising:
A work supporting portion for supporting in a state facing
A high-frequency heating coil that moves relatively inside the groove,
Cooling liquid jet that moves relatively inside the groove following the wave heating coil
Spray jacket, the high-frequency heating coil and coolant spray
On the back of the work facing upward in synchronization with the jacket
A second cooler that moves relatively and supplementarily cools the back surface of the work
And a rejectable liquid injection jacket.

For this reason, in the case of this internal hardening device,
Is a high-frequency heating coil and cooling liquid jet jacket
When the tool moves relative to each other, the surface of the grooved workpiece
With the coolant spray jacket facing downward.
The cooling liquid ejected from the tank is immediately discharged out of the groove,
Since the liquid does not accumulate inside the groove, the high-frequency heating coil
Work distortion can be reduced by the preheating effect.
In particular, high-frequency heating coils and coolant spray jackets
Second cooling that moves relative to the back of the work in synchronization with
Liquid jet jacket supplementarily cools the back of the work
So that the cooling liquid is discharged out of the groove.
Well, the heat history on the back side of the work is intentionally controlled.
Thus, the distortion of the work due to quenching is further reduced.

Further, the inner surface quenching device according to claim 5 is characterized in that
Inner quenching to quench the inner surface of the groove formed on the surface of the workpiece
An apparatus, comprising:
A work supporting portion for supporting in a state facing
A high-frequency heating coil that moves relatively inside the groove,
Cooling liquid jet that moves relatively inside the groove following the wave heating coil
Spray jacket, the high-frequency heating coil and coolant spray
On the back of the work facing upward in synchronization with the jacket
The second height which moves relatively and supplementarily heats the back surface of the work
And a frequency heating coil. Because of this,
If using an insertion device, a high-frequency heating coil and
Grooves are formed when the cooling fluid spray jacket moves relatively
By keeping the surface of the work
Coolant sprayed from the coolant injection jacket immediately out of the groove
Is drained out and the coolant does not accumulate inside the groove.
Reduce distortion of workpiece by preheating effect of high frequency heating coil
Can be Also especially high frequency heating coils and cooling
Relative transfer on the back of the work in synchronization with the liquid spray jacket
By moving the second high-frequency heating coil,
Since the auxiliary heating is used, the cooling liquid outside the groove
In addition to heat discharge, the heat history on the back side of the work is intentionally controlled
The work distortion due to quenching is further reduced
You.

Further, the inner surface quenching device according to claim 6 is
Internal quenching to quench the inner surface of the groove formed on the surface of the work
An injection device, wherein the workpiece is placed on a surface on which a groove is formed.
A work supporting portion for supporting the work
A high-frequency heating coil that moves relatively inside the groove
Coolant that moves relatively inside the groove following the frequency heating coil
A spray jacket, the high-frequency heating coil and a coolant spray
On the back of the work facing upward in synchronization with the shooting jacket
Is relatively moved, and the back side of the work is auxiliary cooled.
A cooling liquid spray jacket, the high-frequency heating coil and a cooling
The back of the work facing upwards in synchronization with the repellent spray jacket
Relative movement on the surface and auxiliary heating of the back surface of the work
A second high-frequency heating coil. For this reason,
A second coolant jet jacket and a second high frequency if necessary
Higher work distortion by using different heating coils
Can be reduced.

[Brief description of the drawings]

FIG. 1 is an inner surface quenching method according to a first embodiment of the present invention .
It is a schematic explanatory view of a quenching apparatus.

FIG. 2 is an inner surface quenching method according to a second embodiment of the present invention .
It is a schematic explanatory view of a quenching apparatus.

FIG. 3 is a schematic explanatory view illustrating a conventional inner surface quenching method.
is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Work 11 Work surface 12 Work groove 13 Groove inner surface 14 Groove inner bottom surface 15 Work back surface 20 High-frequency heating coil 30 Coolant spray jacket 31 Nozzle hole 40 Second coolant spray jacket 41 Nozzle hole 50 Second High frequency heating coil

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C21D 1/10 C21D 1/42 C21D 9/00

Claims (6)

(57) [Claims] (1) The inside of a groove formed on the surface of a work is aligned with
The inner surface of the groove is continuously heated by the moving high-frequency heating coil.
While heating, check the inside of the groove following the high-frequency heating coil.
The heated surface of the groove is heated
In the method of internal quenching of a groove to be quenched,
With the surface of the groove facing down, apply high frequency
When the heat coil and coolant spray jacket move relatively
The top of the work facing upwards
Relative to the oil and coolant spray jacket
The back surface of the work is supplemented by the second coolant spray jacket.
An internal quenching method characterized by auxiliary cooling . 2. The inside of the groove formed on the surface of the workpiece is
The inner surface of the groove is continuously heated by the moving high-frequency heating coil.
While heating, check the inside of the groove following the high-frequency heating coil.
The heated surface of the groove is heated
In the method of internal quenching of a groove to be quenched,
With the surface of the groove facing down, apply high frequency
When the heat coil and coolant spray jacket move relatively
The top of the work facing upwards
Relative to the oil and coolant spray jacket
The second high-frequency heating coil assists the back of the work
Internal quenching method characterized by heating to an inner surface. 3. The inside of the groove formed on the surface of the work is aligned.
The inner surface of the groove is continuously heated by the moving high-frequency heating coil.
While heating, check the inside of the groove following the high-frequency heating coil.
The heated surface of the groove is heated
In the method of internal quenching of a groove to be quenched,
With the surface of the groove facing down, apply high frequency
When the heat coil and coolant spray jacket move relatively
The top of the work facing upwards
Relative to the oil and coolant spray jacket
The back surface of the work is supplemented by the second coolant spray jacket.
Cool the auxiliary work and place the work
Synchronized with the frequency heating coil and coolant spray jacket
The second high-frequency heating coil that moves against the back of the workpiece
Internal quenching method characterized by auxiliary heating of the surface. 4. An inner surface of a groove formed on a surface of a work is burned.
In the internal quenching device that performs quenching, a groove is formed in the work.
Word over click support for supporting the surface in a state of facing downward
And a high-frequency heating core for relatively moving inside the groove of the work.
And the inside of the groove following this high-frequency heating coil
A moving coolant spray jacket and the high-frequency heating coil;
Water facing upward in synchronization with the
Relative movement on the back of the workpiece to assist the back of the workpiece
A second coolant spray jacket for cooling
Internal quenching device characterized by the following . 5. An inner surface of a groove formed on a surface of a work is burned.
In the internal quenching device that performs quenching, a groove is formed in the work.
Work support that supports the cut surface facing downward
And a high-frequency heating core for relatively moving inside the groove of the work.
And the inside of the groove following this high-frequency heating coil
A moving coolant spray jacket and the high-frequency heating coil;
Water facing upward in synchronization with the
Relative movement on the back of the workpiece to assist the back of the workpiece
And a second high-frequency heating coil for heating.
That the inner surface hardening equipment. 6. Burning is performed on the inner surface of the groove formed on the surface of the work.
In the internal quenching device that performs quenching, a groove is formed in the work.
Work support that supports the cut surface facing downward
And a high-frequency heating core for relatively moving inside the groove of the work.
And the inside of the groove following this high-frequency heating coil
A moving coolant spray jacket and the high-frequency heating coil;
Water facing upward in synchronization with the
Relative movement on the back of the workpiece to assist the back of the workpiece
A second cooling liquid spray jacket for cooling;
Upward in synchronization with the heat coil and coolant spray jacket
Relative movement on the back side of the work
And a second high-frequency heating coil for auxiliary heating.
The inner surface hardening apparatus according to symptoms.