KR101834372B1 - Surface defect inspection apparatus for gear-parts - Google Patents

Abstract

The present invention relates to an apparatus for measuring surface defects of gear parts, and more particularly, to an apparatus for measuring surface defects of gear parts configured to measure surface defects of gear parts which are objects to be measured. A detection portion has gear teeth formed on the inner circumference surface thereof, wherein the gear teeth correspond to gear grooves of gear parts. In the detection portion, a probe is installed outside the gear teeth so as to detect a change in magnetic field by induction of an eddy current when surface defects occur in the gear grooves.

Description

TECHNICAL FIELD [0001] The present invention relates to a surface defect measuring apparatus for a gear part,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface defect measurement apparatus for a gear component, and more particularly, to a surface defect measurement apparatus for a gear component that detects surface defects such as cracks in gear parts generated in a high frequency heat treatment process by detecting a change in magnetic field due to eddy current To a defect measuring apparatus.

Generally, a heat treatment method using high frequency induction heating is a method in which a high frequency current flows in a primary circuit composed of a coil or the like by using a secondary circuit of various mechanical parts made of a steel material to be heat treated, Eddy current is induced in the surface layer of the heat treatment object, which is a secondary circuit, by alternating magnetic flux generated in the heat treatment object, and the surface layer of the heat treatment object is heated to the A1 transformation point to the A3 transformation point or more of the steel using the Joule heat generated at this time , A current flow of the coil is blocked and a heated heat treatment object is quenched by using a cooling medium such as cooling water so that only the surface layer of the object to be heat treated can be transformed into a martensitic structure without changing the internal structure of the object to be heat treated to be.

The surface heat treatment method using the high frequency induction heating is a method for improving the mechanical properties such as fatigue strength, abrasion resistance and toughness of the steel machine parts mainly because of the rapid heating to the object to be heat treated and the ability to locally heat only the surface of the object to be heat treated It has been widely used and contributes greatly to the weight reduction and durability improvement of various machine parts.

However, when the object to be heat-treated is heated at a high temperature for a long time in the high-frequency heat treatment, cracks may occur in the tooth outer diameter of the gear part, for example, during quenching.

Accordingly, there is disclosed a measuring apparatus including a probe for detecting surface defects generated in such a heat treatment object through a magnetic field caused by an eddy current by inducing an eddy current.

However, the probe of the measuring device is provided outside the teeth of the gear component to measure surface defects of the rotating gear component. However, the tooth bottom of the gear groove formed in the gear component is spaced apart from the probe, Surface defects occurring on the bottom surface can not be accurately measured.

Particularly, cracks occurring in the bottom surface of gear parts occur mainly in the width direction of the gear at the inner edge of the gear groove, so that surface defects occurring in the inner edge of a new type of gear groove capable of securing productivity, accuracy and reliability A measuring device capable of performing the measurement is required.

Japanese Laid-Open Patent Publication No. 2009-036683 (2009.02.19)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a method and apparatus for detecting surface defects such as cracks of gear parts generated in a high frequency heat treatment process through a magnetic field induced by eddy current, Shaped detecting portion in which a plurality of probes are formed in a gear formed on a surface of the gear portion and inserted into the inner edge of the gear groove of the gear component so as to correspond to the surface of the gear portion so that surface defects occurring in the inner edge of the gear groove can be easily detected And to provide an apparatus for measuring surface defects of gear parts.

In order to accomplish the above object, there is provided an apparatus for measuring surface defects of a gear component according to the present invention, comprising: a surface defect measurement device for measuring a surface defect of a gear component as a measurement object; A probe for detecting a change in a magnetic field caused by induction of an eddy current when a surface defect occurs in the gear groove is provided outside the gear.

According to the present invention, the detecting portion is formed in an arc shape having a predetermined radius, and a plurality of gears and gear grooves are repeatedly formed on the inner circumferential surface.

According to the present invention, the detecting unit is configured to detect a surface defect of the gear part that is seated on the receiving jig when the gear part reaches the position of the take-out part for taking out the gear part after the high frequency heat treatment process, Is moved in parallel to the center of the gear component from one side of the outer circumferential surface, while the gear of the detection portion is installed so as to be able to move up and down in a state of being inserted into the gear groove of the gear component.

According to the present invention, there are provided a gear outer diameter detector provided at a center of the outer side of the gear part and having a sensing part for measuring information on the gear outer diameter of the rotating gear part; And a control unit for controlling the rotational displacement of the gear component so that the probe of the detection unit can be inserted corresponding to the gear groove of the gear component based on the information measured by the gear outer diameter detecting unit, And the vertical displacement is adjusted so that the detection portion can be inserted into the gear groove of the gear component whose rotational displacement is controlled.

According to the present invention, the detecting section includes first and second probes provided on both sides of the outer edge of the gear of the detecting section so as to measure surface defects occurring at the inner edge of the gear groove.

According to the present invention, the detecting unit is formed of any one of ½ circle arc, 1/4 arc arc and 1/8 arc arc.

According to the apparatus for measuring surface defects of a gear component according to the present invention having the above-mentioned structure, it is possible to accurately detect surface defects in the longitudinal direction generated at the tooth bottom of the gear component, particularly at the inner edge of the gear groove during the high frequency heat treatment process, There is an effect that it can be easily detected.

Since surface defects can be measured at the extraction part of the high-frequency thermal processing apparatus, it is not necessary to add a separate space for performing the measurement process, so that the number of processes can be reduced and the cost can be reduced.

1 is a perspective view showing a high-frequency thermal processing apparatus according to the present invention.
2 is a perspective view showing an apparatus for measuring surface defects of a gear component according to the present invention.
3 is a plan view showing a detection portion of a surface defect measurement apparatus for a gear component according to an embodiment of the present invention.
4 is a plan view showing a detection unit of a surface defect measurement apparatus for a gear component according to another embodiment of the present invention.
5 is a side view showing a state in which a vertical displacement of an apparatus for measuring surface defects of a gear part according to the present invention is adjusted.
6 is a side view showing the measurement state of the surface defect measurement device of the gear part according to the present invention.
7 is an operation diagram showing an operating state of a surface defect measuring apparatus for a gear part according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 7. FIG.

As shown in Fig. 1, the object to be heat-treated in the high-frequency heat treatment process according to the present invention is an annular ring gear having a hollow shape. Such a heat treatment object requires precise inspection of surface defects such as cracks generated in the tooth outer diameter do.

The apparatus for measuring surface defects of a gear part according to the present invention is a detecting part 100 for measuring surface defects of a gear part g as a measurement object by using an eddy current and the detecting part 100 comprises an excitation coil By measuring the change in impedance of the detection coil placed close to the measurement surface of the gear part (g) and generating an eddy current on the measurement surface and disposed adjacent to the measurement surface, the state of the eddy current is secured, .

The gear part (g) is rotatably mounted on the rotary jig (j) so that the entire measurement surface of the tooth outer diameter can be measured by the inspection apparatus.

The detecting unit 100 is formed in an arc shape having a predetermined radius and a plurality of gear teeth 101 and gear grooves 102 are repeatedly formed on the inner circumferential surface.

Longitudinal side surface defects that can occur on the inner edge side of the gear groove h of the gear part g are formed on both sides of the outer edge of the plurality of gear teeth 101 formed on the inner circumferential surface of the detection part 100, And a plurality of probes 110 and 120 for detecting the magnetic field due to the eddy current.

The probes 110 and 120 of the detection unit 100 are formed to face each other with respect to the inner edge of the tooth bottom of the gear component g to detect surface defects of the gear component g by inducing an eddy current, Is provided outside the gear teeth (101) engaged with the gear groove (h) of the part (g), it is possible to easily detect surface defects easily and without errors.

The detection unit 100 is configured to obtain information on longitudinal surface defects occurring along the inner edge of the gear groove h when the gear member h reaches the gear groove h which is the measurement region of the gear component g.

The information on the measurement surface thus obtained is used to evaluate surface defects such as cracks in the gear groove h of the gear component g.

The detecting section 100 is provided with probes (not shown) provided on both sides of the outer edge of the gear teeth 101 corresponding to the respective inner corners so as to more accurately detect surface defects with respect to the inner corners of the gear groove h of the gear component g 110 and 120. In the embodiment of the present invention, it is preferable that the gear teeth 101 corresponding to the gear groove h of the gear component g include two first and second probes 110 and 120.

According to the embodiment of the present invention, there is provided an outside diameter detecting portion (not shown) for measuring a defect with respect to the outside diameter of a gear part g which is provided outside the teeth of the conventional gear part g and rotates.

The tooth outer diameter detecting portion is provided on the outer side, the lower portion and the outer side center of the gear part (g) to detect a defect with respect to the tooth outer diameter precisely.

The outside diameter detecting portion is provided with a sensing portion for measuring information on the outside diameter of a gear component (g) installed at the center of the outside of the gear component (g).

(Not shown) of the detecting unit 100 can insert the probe 110 or 120 corresponding to the gear groove h of the gear part g based on information such as the pitch with respect to the tooth outer diameter detected by the tooth outer diameter detecting unit The rotational displacement of the gear part g is controlled.

As shown in FIGS. 3 and 4, the detecting unit 100 according to the present invention is preferably formed in any one of a 1/2 circle arc, a 1/4 circle arc, and a 1/8 circle arc Do. That is, the detecting unit 100 includes a gear 101 on which probes 110 and 120 are provided on the inner side of an arc, and is configured to be insertable into the gear groove h of the corresponding gear part g.

Such a detecting portion 100 is installed so as to be applicable to the take-out portion 40 capable of taking out the gear component g from the high frequency heat treatment apparatus for heat treatment of the gear component g to the outside.

According to a preferred embodiment of the present invention, the heat treatment and the surface defect measurement are automatically performed in the same jig, and the heat treatment and the surface defect measurement are not separated from each other. In the high frequency heat treatment apparatus, It is possible to reduce the number of process steps related to the high frequency heat treatment process and reduce the process cost.

The high frequency heat treatment apparatus includes a supply section 10, a heat treatment section 20, an air spray section 30, and a blowout section 40 on a disk-shaped rotary plate 1 rotatably provided.

The high frequency heat treatment apparatus is characterized in that the accommodating jig 5 is provided on the rotary plate 1 so that the gear component g is received on the rotary plate 1 rotating at an angle determined by the motor and circulated to the positions of the respective parts, As shown in FIG.

In the high-frequency thermal processing apparatus according to the present invention, the supply unit 10 and the take-out unit 40, which can supply the heat treatment object p to the receiving jig 5 or take out the heat treatment object p from the receiving jig 5, have.

In other words, with the gear part (g) being loaded in the receiving jig (5) located in the supply part (10), the receiving jig (5) is rotated by the rotating plate (1) The supply part 10 is positioned at the same position as the take-out part 40 which can unload the gear part g and take it out to the outside, It will be placed.

The receiving jig 5 is provided with a seating portion 5a on which a heat treatment object p is seated along a top edge thereof and a ring gear portion 5c on the upper surface of the seating portion 5a, (g) in which the ring gear is stably mounted. An elevating portion 5c is formed at a lower portion of the seating portion 5a so that the receiving jig 5 can be elevated in the vertical direction and the receiving jig 5 can be rotated inside the elevating portion 5c (Not shown) is formed.

In addition, it is preferable that the receiving jig (5) is provided with four constituent parts along the turning radius on the upper surface of the rotary plate (1). That is, the accommodating jig 5 can be positioned in the supply unit 10, the heat treatment unit 20, the air jet unit 30, and the take-out unit 40 while circulating along the rotary plate 1.

The supply unit 10 is installed at any position of the rotary plate 1 to load the gear parts g one by one in order to be accommodated in the accommodating jig 5. The take-out unit 40 includes a gear part (g) is unloaded from the receiving jig 5 to be discharged.

As described above, the supply unit 10 and the take-out unit 40 are not a separate structure for separately loading or unloading the gear component g, but have a single structure, so that the heat treatment object p can be continuously Supply and take-out functions.

The heat treatment unit 20 is installed at a rotating position of the rotary plate 1 facing the feed and take-out unit 40 to advance the high frequency heat treatment process to the heat treatment object p accommodated in the accommodation jig 5.

The air jetting section 30 is provided at a rotating position of the feed section 10 and the take-out section 40 in the rotary plate 1 so as to air foreign matter and cooling water remaining in the heat treatment object p before and after the high- Remove by blowing.

The high-frequency heat treatment apparatus operated through such a configuration automatically rotates by a rotating rotary plate 1 at a certain angle and performs a series of circulation processes necessary for the high-frequency heat treatment.

When the receiving jig 5 reaches the take-out portion 40, the tooth-outside diameter detecting portion measures information on the tooth-outside diameter of the rotating gear component g.

The detection unit 100 can adjust the horizontal displacement parallel to the center of the gear component g from one side of the receiving jig 5 so that the surface defect of the gear component g can be measured by the detection unit 100 Respectively.

The detecting unit 100 is movable toward the receiving jig 5 in order to measure surface defects of the gear part g while the receiving jig 5 reaches the take-out part 40. [

6, when the detection unit 100 is positioned below the gear component g, the control unit determines that the detection unit 100 detects the gear component g (g The rotational displacement of the gear part g is controlled so as to be insertable corresponding to the gear groove h of the gear part h.

The gear part (g) is rotated at a rotation angle corresponding to the inner peripheral surface interval of the detection part (100) at a specific reference position in which the rotational displacement is controlled, and the detection part (100) the vertical displacement is adjusted so as to be insertable into the gear groove h of the gear g.

Thus, adjustment of the horizontal and vertical displacements of the detection unit 100 is performed through the guide device 200 such as an LM guide, an actuator, and the like.

The probes 110 and 120 of the detection unit 100 are rotated by the rotation motor at a rotation angle corresponding to the inner peripheral surface interval of the detection unit 100 at a specific reference position, So that the vertical displacement can be adjusted and inserted into the gear groove h of the gear part g.

When the gear teeth 101 of the detecting portion 100 are inserted into the gear groove h of the corresponding gear component g, the probes 110 and 120 provided on both sides of the outer edge of the gear tooth 101 are engaged with the gear component g And the surface defect of the gear component g is measured.

Hereinafter, the operation of the surface defect measuring apparatus of the gear part (g) according to the present invention will be described.

5 is an operation diagram showing an operating state of a surface defect measuring apparatus for a gear part according to the present invention.

First, the gear part g to be measured according to the present invention is loaded on the seating part 5a of the receiving jig 5 located in the supply part 10 of the high frequency thermal processing apparatus and then subjected to the heat treatment step in the heat treatment part 20 And is then circulated to the blowout unit 40.

At one side of the receiving jig 5 located at the position of the take-out portion 40, the tooth outer diameter detecting portion measures information on the tooth outer diameter of the gear component g.

The detecting portion 100 for measuring the surface defect of the inner edge located in the gear groove h of the gear component g is moved to one side of the gear component g seated on the receiving jig 5 7 (a)).

The rotation of the gear part g is controlled so that the probes 110 and 120 of the detection part 100 can be inserted in correspondence with the gear groove h of the gear part g based on the information about the outside diameter measured by the outside diameter detecting part. Thereby controlling the displacement.

The gear component g rotates at a rotation angle corresponding to the interval between the inner circumferential surfaces of the detection portion 100 at a specific reference position in which the rotational displacement is controlled.

Next, the detection unit 100 adjusts the vertical displacement to insert the gear part h of the gear part g whose rotational displacement is adjusted (see Fig. 7 (b)).

 The detection part 100 is inserted into both sides of the inner edge of the gear groove h of the gear part g to measure the surface defect of the gear part g when the displacement is adjusted vertically by the guide device 200 do.

After the surface defect of the gear part (g) is measured, the detecting part (100) separates from the gear part (g) by adjusting the vertical displacement.

As described above, after the surface defect on the part of the measurement surface of the gear part (g) is measured, the receiving jig 5 is rotated at a rotation angle corresponding to the inner circumferential surface interval of the detection part 100 (c)).

Then, the detection unit 100 continuously measures the remaining unmeasured gear parts g.

In this manner, the circulation process of the receiving jig 5 and the measurement process of the detection unit 100 are continuously performed to enable measurement of all surface defects of the entire gear groove h of the gear component g.

Therefore, the present invention can precisely and easily detect the surface defects of the inner edge located in the gear groove (h) of the gear part (g) without error.

Further, the gear part (g) is moved to the take-off part (40) of the high-frequency thermal processing apparatus in a separate measurement step for measuring surface defects of the gear part (g) So that a separate space for the measurement process is not required.

On the other hand, Fig. 7 (d) shows a state in which the detecting portion 100, which has measured all the surface defects of the entire gear groove h of the gear component g, is separated from the gear component g by adjusting the vertical displacement.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be understood that various modifications made by the person skilled in the art are also within the scope of protection of the present invention.

100: Detection unit 101:
102: gear groove 110, 120: probe
200: guide device

Claims (6)

1. A surface defect measuring apparatus for a gear part for measuring surface defects of a gear part as a measurement object,
And a detecting unit that detects a change in a magnetic field caused by induction of an eddy current when a surface defect occurs in the gear groove is provided on the outer side of the gear Characterized in that the surface defect measurement device of the gear part.
The method according to claim 1,
Wherein the detecting portion is formed in an arc shape having a predetermined radius, and a plurality of gear teeth and a gear groove are repeatedly formed on the inner circumferential surface.
3. The method according to claim 1 or 2,
Wherein:
And the surface of the gear piece is positioned so as to be able to measure a surface defect of the gear component placed on the receiving jig when the gear component reaches the position of the take-out portion for taking out the gear component after the high- And the gears of the detecting portion are inserted in the gear grooves of the gear component so as to be able to move up and down.
The method of claim 3,
An outer diameter detector provided at a center of the outer side of the gear part and having a sensing part for measuring information about a tooth outer diameter of the rotating gear part; And
And a control unit for controlling the rotational displacement of the gear component so that the probe of the detection unit can be inserted in correspondence with the gear groove of the gear component based on the information measured by the outside diameter detecting unit,
The gear component is rotated at a rotation angle corresponding to an inner circumferential surface interval of the detection portion at a specific reference position in which the rotational displacement is controlled,
Wherein the detecting portion is adjusted so that the vertical displacement is insertable into the gear groove of the gear component whose rotational displacement is controlled.
5. The method of claim 4,
Wherein the detecting portion includes first and second probes provided on both sides of the outer edge of the gear of the detecting portion so as to measure surface defects occurring at inner edges of the gear groove. Device.
3. The method of claim 2,
Wherein the detecting unit comprises one of a 1/2 circle arc, a 1/4 circle arc, and a 1/8 circle arc.

Images