KR20150068233A - High frequency heat treatment apparatus for the shaft of the clutch mission - Google Patents

Abstract

The present invention relates to a high frequency heat treatment apparatus for a shaft of a clutch transmission, which automatically performs a high frequency heat treatment to harden a surface of the shaft mounted inside the clutch transmission of a vehicle. The high frequency heat treatment apparatus for the shaft comprises: an input unit (10) to laterally arrange a shaft (1) to be heat-treated, side by side; a rotational turntable (20) separated and installed on the input unit, wherein a plurality of insertion holes (22) into which the shaft is inserted are formed along a circle; a supply unit (30) installed between the input unit and the rotational turntable (20), wherein the shaft disposed on the input unit is picked and moved, and then, is vertically rotated to be inserted into the insertion hole (22) of the rotational turntable (20); a sensing unit (40) installed on the side of the rotational turntable, wherein the sensing unit (40) senses whether the shaft exists in the insertion hole (22); a high-frequency heat treatment and cooling unit (50) installed on the side of the rotational turntable, wherein an inductor coil having a circular inner radius is moved up and down, the shaft is heat-treated and tempered by the inductor coil while the shaft rotates, and cooling is achieved by a coolant sprayed from a coolant nozzle disposed on the side of the inductor coil; a purge unit (60) installed on the side of the rotational turntable, wherein the shaft which completes a heat treatment, cooling and tempering is purged from the insertion hole (22) of the rotational turntable.

Description

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

The present invention relates to a high frequency heat treatment apparatus for a shaft for a clutch mission, and more particularly to a high frequency heat treatment apparatus for a shaft for a clutch mission that performs high frequency heat treatment for hardening the surface of a shaft mounted in a clutch mission of an automobile 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, there is a demand for automated equipment for solving the problem of the high frequency heat treatment of the shaft by such a manual operation.

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 is to provide a surface hardening high frequency heat treatment apparatus capable of eliminating the risk of a safety accident of a worker 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 achieve the above object, a high frequency heat treatment apparatus for a shaft according to a preferred embodiment of the present invention comprises: a charging unit 10 for aligning a shaft 1 to be heat treated side by side in a row; A rotary turntable (20) spaced apart from the input part and having a plurality of insertion holes (22) inserted into the circular insertion hole for inserting the shaft; A supply unit 30 installed between the charging unit and the rotary turntable 20 for picking up a shaft located at the charging unit and vertically rotating the shaft to insert the rotary shaft into the insertion port 22 of the rotary turntable 20, ; A sensing unit 40 installed on a side surface of the rotary turntable for sensing whether or not a shaft exists in the insertion port 22; The induction coil having a circular inner diameter is moved up and down, and the shaft is rotated and heat-treated and tampered by the inductor coil, and the cooling water is discharged from the cooling water jet opening A high frequency heat treatment and cooling unit (50) for cooling by cooling water injected; And a take-out part (60) installed on a side surface of the rotating turntable, for taking out the shaft after heat treatment, cooling, and tempering from the insertion port (22) of the rotating turntable.

According to a preferred embodiment of the present invention, there is further provided an inspection unit attached to a side surface of the rotary turntable 20 for determining whether or not the heat treatment of the shaft after the heat treatment and cooling has failed, The current value of the completely formed shaft 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 of the present invention, the charging unit 10 includes an inclined placement table 11 which is aligned so that the shafts are aligned in a line and descends downward by the weight of the shaft, And a guide lifting cylinder 12 for lifting the shaft up to a predetermined height.

According to a preferred embodiment of the present invention, the supply unit 30 includes a clamp unit 31 for gripping the shaft supplied from the charging unit, a vertical moving unit 32 for vertically moving the shaft gripped by the clamp unit, A horizontal moving part 33 for horizontally moving the gripped shaft on the rotating turntable, a rotating part for rotating the shaft in the vertical direction so as to insert the horizontal shaft held by the gripping part into the insertion opening 22 of the rotating table, (34).

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 must be of 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)

(10) for aligning the shaft (1) to be heat treated side by side in a row;
A rotary turntable (20) spaced apart from the input part and having a plurality of insertion holes (22) inserted into the circular insertion hole for inserting the shaft;
A supply unit 30 installed between the charging unit and the rotary turntable 20 for picking up a shaft located at the charging unit and vertically rotating the shaft to insert the rotary shaft into the insertion port 22 of the rotary turntable 20, ;
A sensing unit 40 installed on a side surface of the rotary turntable for sensing whether or not a shaft exists in the insertion port 22;
The induction coil having a circular inner diameter is moved up and down, and the shaft is rotated and heat-treated and tampered by the inductor coil, and the cooling water is discharged from the cooling water jet opening A high frequency heat treatment and cooling unit (50) for cooling by cooling water injected; And
And a takeout part (60) installed on a side surface of the rotary turntable for taking out the heat treated, cooled, and tampered shaft from the insertion opening (22) of the rotary turntable. The method according to claim 1,
Further comprising an inspection unit attached to a side surface of the rotary turntable (20), for determining whether or not a heat treatment of the shaft after the heat treatment and cooling is defective,
Wherein the inspection unit judges whether or not the heat treatment is defective by comparing the current value of the shaft in which the heat treatment is completely performed after applying the preset current with the current value of the shaft subjected to the heat treatment, High frequency heat treatment system of shaft. The method according to claim 1,
The charging unit 10
An inclined placement table (11) which is inclined so that the shafts are arranged in a line and descend downward by the weight of the shaft,
And a guide ascending cylinder (12) for lifting the shaft located at the lowest side of the inclined attitude band up by a predetermined height. The method according to claim 1,
The supply unit 30
A clamping unit 31 for gripping the shaft supplied from the charging unit,
A vertical movement part (32) for vertically moving the shaft gripped by the grip part,
A horizontal moving part 33 for horizontally moving the shaft gripped by the gripper part on the rotating turntable,
And a rotation unit (34) for rotating the shaft in the vertical direction so that the horizontal shaft held by the clamp unit can be inserted into the insertion port (22) of the rotary table.

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