KR101532722B1 - High frequency heat treatment method for the shaft of the clutch mission - Google Patents

Abstract

The present invention relates to a high-frequency heat treatment method for a shaft for a clutch transmission that automatically performs a high-frequency heat treatment to harden a surface of a shaft mounted in a clutch mission of an automobile, To align them side by side in a row; A feeding step of picking up the shaft, rotating it vertically and inserting it into the insertion port 22 of the rotating turntable 20; A sensing step of sensing whether or not a shaft is present in the insertion port (22) of the rotary turntable (20); Cooling, and tampering, in which the heat treatment is performed by an inductor coil having a circular inner diameter with respect to the shaft on the rotary turntable 20, cooling is performed by cooling water after the heat treatment, and tampering is performed by the inductor coil, step; And a take-out step of taking out the heat-treated, cooled and tempered shaft from the insertion port 22 of the rotary turntable.

Description

[0001] The present invention relates to a high frequency heat treatment method for a shaft,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heat treatment method for a shaft for a clutch mission, and more particularly to a high-frequency heat treatment method for a shaft for a clutch mission, will be.

More than 20,000 parts are used in automobiles, and each part is required to be surface hardened in order to improve durability.

The shaft for the 6DCT250 is mounted on the center of the clutch mission of the vehicle and transmits the driving force transmitted from the engine by engaging with the counter gear (reverse gear).

6DCT250 shafts must have durability to withstand high speed rotation with counter gear (reverse gear), so they must meet very high surface strength and require very thin hardening depth to prevent cracking of the heat treatment .

Conventionally, the shaft for 6DCT250 has been subjected to a high-frequency heat treatment by a manual operation of a worker. The heat treatment of the shaft for the 6DCT250 by such a manual operation has the following problems.

1. Cracking of the heat treatment part: Since the shaft is a very small product having a thickness of 10 mm, even if the output of the high frequency equipment or the management of the heating time is slightly disturbed, the whole part is cured.

2. Crack generation in the heat treatment part: Cracks are generated in some sections due to stress concentration in the entire section when the shaft is fully cured.

3. Increased worker fatigue: Since the heat treatment of the shaft is performed entirely by the manual operation of the operator, the fatigue of the operator is increased at the long-time worker's work, which can lead to a serious fault such as a worker error.

4. Low production per hour: Because it is a manual production mass production, it is in a very low condition in terms of efficiency of work production.

5. Instability of shaft quality: High-frequency heat treatment by hand is very difficult to stabilize the quality of products because of the possibility of incorporation / mixing of defective products in mass production due to operator's mistake.

Therefore, an automated process for solving the problem of the high-frequency heat treatment of the shaft by such a manual operation is required.

Korean Patent Registration No. 0597238 (registered on June 28, 2006, automated production line for surface hardening heat treatment)

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a high-frequency heat treatment for surface hardening of a shaft, in particular a high frequency heat treatment for hardening a surface of a shaft for an automotive clutch mission, The present invention provides a surface hardening high frequency heat treatment method capable of increasing the productivity and eliminating the risk of a safety accident of an operator and removing only defective products when a defective product is generated.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to accomplish the above object, a high frequency heat treatment method for a shaft according to a preferred embodiment of the present invention includes the steps of aligning shafts to be heat treated side by side in a row; A feeding step of picking up the shaft, rotating it vertically and inserting it into the insertion port 22 of the rotating turntable 20; A sensing step of sensing whether or not a shaft is present in the insertion port (22) of the rotary turntable (20); Cooling, and tampering, in which the heat treatment is performed by an inductor coil having a circular inner diameter with respect to the shaft on the rotary turntable 20, cooling is performed by cooling water after the heat treatment, and tampering is performed by the inductor coil, step; And a take-out step of taking out the heat-treated, cooled and tempered shaft from the insertion port 22 of the rotary turntable.

According to a preferred embodiment of the present invention, the inspection step further includes the step of inspecting whether or not the shaft having undergone the heat treatment, the cooling and the tampering is defective by the inspection part attached to the side surface of the rotary turntable 20, After the current is applied, the current value of the shaft, which is completely provided with the heat treatment, is compared with the current value of the shaft subjected to the heat treatment, cooling, and tempering on the rotary table to determine whether or not the heat treatment is defective.

According to a preferred embodiment, the charging step includes positioning the shafts in a line by a slanting table so that the shafts sequentially descend downward by the weight of the shafts, by a guide raising cylinder, And lifting the shaft located at the predetermined position by a predetermined height.

According to a preferred embodiment, the supplying step includes the steps of: holding the shaft supplied by the charging step by the gripping part 31; raising the shaft gripped by the gripping part by a predetermined height by the vertical moving part 32; A step of horizontally moving the shaft gripped by the gripper by the horizontal moving part (33) on the rotating turntable; a step of rotating the shaft in the horizontal direction by the rotating part (34) (22), and lowering the vertically erected shaft and inserting the lowered shaft into the insertion port (22) of the rotary table.

In the shaft high frequency heat treatment apparatus of the present invention, the high frequency heat treatment for the shaft is performed by an automated line, the quality of the product (shaft) can be kept constant, the fatigue of the worker can be reduced, and the production per hour can be dramatically increased. In addition, there is an advantage that it is possible to eliminate the risk of a safety accident of an operator, and to remove only a defective product when a defective product is generated.

In addition, since the work is carried out according to the exact time and the exact specification, it is possible to partially cure the specific part, and there is an advantage that the heat treatment quality such as no crack generation is also excellent.

1 is a photograph of a shaft for a clutch mission.
2 is a schematic plan view of a high frequency heat treatment apparatus for a shaft according to a preferred embodiment of the present invention;
3 is a side schematic view of a high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention, in which a sensing section and a takeout section are omitted.
4 is a plan view of an input portion of a high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention.
FIG. 5 is a side view of a feeding portion and a feeding portion of a high-frequency heat treatment apparatus for a shaft according to a preferred embodiment of the present invention. FIG.
6 is a side view of the take-out portion of the high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention.

Hereinafter, a high frequency heat treatment apparatus for a shaft according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a photograph of a shaft for a 6DCT 250 to be subjected to a surface hardening heat treatment in the present invention.

In the shaft for 6DCT250, the high-frequency heat treatment section is an upper portion that transmits the driving force, that is, a gear portion that engages with the reverse gear of the engine. The requirements for heat treatment for this part should be free of harmful substances such as burr, burr, rust, surface hardness HV 745 ~ 760, hardening depth 0.3 ~ 1mm [based on HV600] , And the surface is required to have no cracks.

Fig. 2 is a schematic plan view of a high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention, and Fig. 3 is a side schematic view of a high-frequency thermal processing apparatus for a shaft, in which a sensing section and a takeout section are omitted.

2 and 3, the high-frequency thermal processing apparatus for a shaft according to the present invention basically comprises an input unit 10 for aligning a shaft 1 and inputting the same, and a high-frequency heating / A supply unit 30 for moving the shaft from the charging unit to the rotary turntable and a sensing unit 40 for sensing whether or not a shaft is present in the insertion opening 22 of the rotary turntable 20, A high frequency heat treatment and cooling section 50 for performing high frequency heat treatment, cooling and tempering and a takeout section 60 for taking out the shaft from the insertion opening 22 of the rotary turntable 20. [

That is, when the operator places the shaft 1 on the inclined bench 11 of the input unit 10, the supply unit 30 moves the shafts positioned in the input unit one by one to move the insertion opening 22 of the rotary turntable 20, . At this time, the rotary turntable 20 sequentially rotates by a predetermined angle so that the supply unit 30 can sequentially supply the shaft 1. [

The rotating turntable 20 is divided into four parts so that the shaft 1 is sequentially operated. First, the supply part 30, the sensing part 40, the high frequency heat treatment and cooling part 50, the take- Are attached to the side surfaces, respectively, and are rotated at a predetermined angle at a time to perform respective operations. That is, the four components are arranged at an angle of 90 degrees with respect to the rotary turntable 20 so that the four shafts 1 of the rotary turntable perform their respective operations at the same time. Therefore, it is preferable that the number of the stands on the rotary turntable 20 is set to a number corresponding to a multiple of four.

First, the process of supplying the shaft 1 will be described.

FIG. 4 is a plan view of an input portion of a high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention, and FIG. 5 is a side view of an input portion and a supply portion of a high-frequency thermal processing apparatus for a shaft.

Referring to FIGS. 4 and 5, the charging unit 10 is a part for positioning the shaft 1 before supplying the rotating turntable 20, and aligns the shaft to be heat-treated side by side in a line.

The charging unit 10 comprises a warp bench 11 and a guide lifting cylinder 12, and preferably two pairs as shown in the figure. This means that the two shafts can move together to perform sensing, heat treatment, cooling, tampering, and extraction.

The inclined placement table 11 is a portion formed by aligning the shafts 1 in a line and descending downwardly in order by the weight of the shaft and the guide elevation cylinder 12 is located at the bottom of the inclined placement table 12 And the shaft 1 is raised one by one by a predetermined height.

The guide stand 11 is inclined so that it will descend downward one by one by the weight of the shaft. The guide elevating cylinder 12 is provided with a shaft (not shown) by a predetermined height so as to easily grip the shaft by the grip portion 31 of the supply portion 1) is raised.

The shaft 1 lifted to a predetermined height is inserted and inserted into the insertion port 22 of the rotary turntable 20 by the supply portion 30. [ That is, the supply unit 30 is installed between the charging unit 10 and the rotary turntable 20 to pick up and move the shafts 1 located in the charging unit 10 one by one, Is inserted into the insertion port (22) of the turntable (20).

Specifically, the supply unit 30 includes a gripper 31 for gripping the shaft supplied from the charging unit, a vertical moving unit 32 for vertically moving the shaft gripped by the gripper unit, a shaft gripped by the gripper unit, A horizontal moving part 33 horizontally moving on the rotary turntable and a rotation part 34 rotating vertically so as to insert the horizontal shaft held by the clamping part into the insertion port 22 of the rotary table do.

That is, the supply unit 30 grasps the shaft supplied from the charging unit by the gripper unit 31, raises the shaft gripped by the gripper unit by the vertical movement unit 32 by a predetermined height, The shaft 33 is horizontally moved on the rotary turntable and then rotated in the vertical direction so that the shaft in the horizontal direction can be inserted into the insertion port 22 of the rotary table by the rotary unit 34, And inserted into the insertion port 22 of the rotary table.

3, the shaft 1 is shown to be moved in the order of movement. The shaft 1 is held by the clamping unit and is lifted by the vertical movement unit 32, and the state of being horizontally moved by the horizontal movement unit 33 And 3 are rotated by the rotation unit and are vertically erected, and this process is sequentially performed.

Next, the shaft 1 inserted into the insertion port 22 of the rotating turntable is detected by the sensing unit. That is, the sensing unit 40 is installed on the side of the rotating turntable and detects whether the shaft 1 is present at the corresponding position of the insertion port 22. That is, The sensing unit 40 is sensed by the descent of the upper and lower cylinders moving up and down. If the upper and lower cylinders fall below the permissible lower limit value by setting the allowable upper limit value and the permissible lower limit value, it is judged that the shaft does not exist at the corresponding position. If the upper and lower cylinders are not lowered to the allowable upper limit value, , And it is recognized as a normal state only when the upper and lower cylinders fall between the allowable upper limit value and the permissible lower limit value.

If the shaft 1 is detected by the sensing unit 40 not to be in the correct position, that is, if it is lower than the permissible upper and lower limits or falls deeper than the permissible lower limit value, 50 and / or the take-out unit 60 without passing through.

Next, high frequency heating, cooling, and tempering are performed in the high frequency heat treatment and cooling section (50). That is, high-frequency heating, cooling, and tampering are performed by the high-frequency heat treatment and cooling unit 50 provided on the side of the rotating turntable. The high-frequency heat treatment and the tampering are performed by an inductor coil 52 having a circular inner diameter that is moved up and down. Cooling is performed by cooling water jetted from a cooling water jet opening located on the side of the inductor coil. For the sake of simplicity, the cooling water nozzle is not shown in the drawing. The inner diameter of the inductor coil 52 having the circular inner diameter must be a sufficient size that the shaft 1 can be inserted between the inductor coils 52. [

In the present invention, after the shaft 1 is inserted into the inductor coil 52 having a circular inner diameter, the shaft is rotated to perform high-frequency heat treatment, cooling, and tampering.

And the inductor coil 52 having a circular inner diameter is moved up and down. Initially, when the shaft 1 comes to the correct position in a state where the inductor coil 52 is raised, the inductor coil 52 is lowered to wrap the shaft 1. Then, a high frequency electric power is applied to the inductor coil 52 to perform a high frequency heat treatment (about 1 second, about 380 V output). After the high-frequency heat treatment, the cooling water is cooled by the cooling water jetted from the cooling water jet opening (about 2 seconds). Then, a high-frequency power (about 80 V) of a lower output than the high-frequency heat treatment is applied to the inductor coil to perform tampering.

During high-frequency heating, cooling, and tempering of the shaft, the shaft 1 is rotated. This is achieved by attaching a bevel gear to the lower portion of the rotary turntable 20 and rotating the bevel gear by the motor, (22) is rotated. That is, the shaft rotates only in the high frequency heat treatment and cooling section 50 without rotating in the feeding section, the sensing section, and the blowout section. This is because the bevel gear is separately installed at the lower end of the rotating turntable on the side of the high frequency heat treatment and cooling section 50 And the insertion port is rotated by this bevel gear.

Next, the shaft 1 having undergone the high-frequency heat treatment, cooling, and tampering is taken out from the insertion port 22 of the rotating turntable 20 by the take-

FIG. 6 is a side view of the take-out portion of the high-frequency thermal processing apparatus for a shaft according to a preferred embodiment of the present invention. FIG.

6, the take-out unit 60 is provided on the side of the rotating turntable, and the shaft 1 after the work (high frequency heat treatment, cooling, and taming) is taken out from the insertion opening 22 of the rotating turntable 20 Section. The takeout portion 60 includes a grip portion 61 for gripping the shaft, a vertical moving portion 62 for moving the shaft in the vertical direction, and a horizontal moving portion 63 for horizontally moving the shaft. Each component can be pneumatically or hydraulically actuated, preferably driven by air pressure.

When the shaft 1 is positioned at the right position of the take-out part, the grip part 61 of the take-out part 60 is opened and the vertical move part 62 is lowered . When the vertical moving part 62 descends to the maximum, the shaft 1 is positioned inside the clamping part 61. [ At this time, the vertical moving part 62 is raised in a state in which the gripper part 61 is again retracted and the shaft is retracted. When the vertical moving part 62 is raised, the horizontal moving part 63 moves in the opposite direction. When the horizontal moving part 63 moves to the maximum in the opposite direction, the clamping part 61 is again opened in this state to take out / discharge the shaft. After ejecting the shaft, the clamping unit 61 is retracted and the horizontal moving part 63 returns to its original position again.

In addition, if necessary, the surface of the rotating turntable may further include an inspection unit for determining whether or not the heat treatment of the shaft after the heat treatment and cooling is defective.

Although not shown, whether or not the high-frequency heat treatment failure is caused by the inspection unit is made by comparing the current values of the finished product (the comparison object) completely heat-treated after application of the electric current and the heat-treated product inserted in the insertion port of the rotary turntable. That is, when the difference between the current value of the shaft provided separately and the current value of the shaft subjected to the heat treatment, the cooling and the tampering which are located on the rotary table is completely exceeded, the high frequency heat treatment , That is, the product is defective.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied otherwise without departing from the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention, but are intended to be illustrative, and the scope of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

1: Shaft
10:
11: inclined stand 12: guide elevating cylinder
20: rotating turntable 22:
30: supply part 31:
32: vertical moving part 33: horizontal moving part
34:
40:
50: high frequency heat treatment and cooling section 52: inductor coil
60: take-out part 61:
62: vertical moving part 63: horizontal moving part

Claims (4)

A step of aligning the shafts to be heat treated side by side in a row;
A feeding step of picking up the shaft, rotating it vertically and inserting it into the insertion port 22 of the rotating turntable 20;
A sensing step of sensing whether or not a shaft is present in the insertion port (22) of the rotary turntable (20);
Cooling, and tampering, in which the heat treatment is performed by an inductor coil having a circular inner diameter with respect to the shaft on the rotary turntable 20, cooling is performed by cooling water after the heat treatment, and tampering is performed by the inductor coil, step;
And a take-out step of taking out the heat-treated, cooled and tempered shaft from the insertion port (22) of the rotary turntable,
The supplying step includes a step of gripping the shaft supplied from the charging step by the gripping part 31, a step of raising the shaft held by the gripping part by a predetermined height by the vertical moving part 32, A step of horizontally moving a shaft gripped by a grip portion on the rotary turntable by a horizontal shifting portion 33, a step of inserting the horizontal shaft held by the gripping portion into the insertion port 22 of the rotary table by the rotary portion 34 And a step of lowering the vertically erected shaft and inserting the lowered shaft into the insertion port (22) of the rotary table. The method according to claim 1,
Further comprising the step of inspecting whether or not the shaft after heat treatment, cooling, and tampering is defective by an inspection unit attached to a side surface of the rotary turntable (20)
In the inspecting step, it is determined whether or not the heat treatment is defective by comparing the current value of the separately provided shaft, which is completely processed after applying the predetermined current, with the current value of the shaft after heat treatment, cooling, and tempering on the rotary table Wherein the high frequency heat treatment is carried out at a high temperature. The method according to claim 1,
The injecting step
Positioning the shafts by a slanting table so that the shafts are aligned in a row and are sequentially lowered by the weight of the shafts;
And raising the shaft located at the bottom side of the inclined implement by a predetermined height by a guide rising cylinder. ≪ Desc / Clms Page number 19 > delete

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