KR101864569B1

KR101864569B1 - Mold fixed device for heat treatment tray

Info

Publication number: KR101864569B1
Application number: KR1020180010240A
Authority: KR
Inventors: 구자명; 유 철 신; 김일양
Original assignee: 공주대학교 산학협력단; (주)일양금속
Priority date: 2018-01-26
Filing date: 2018-01-26
Publication date: 2018-06-04

Abstract

The present invention relates to a mold fixing apparatus for a heat treatment tray.
Specifically, in a heat treatment tray on which a mold for performing heat treatment is mounted for enhancing durability, in general, since the shape of the mold has various bends from spherical shape to cylindrical shape, To solve the problem,
The present invention relates to a mold fixing apparatus for a heat treatment tray, which is capable of fixing a mold by being detached and attached to a heat treatment tray, and which can solve the problem of sticking between the apparatus and the heat treatment tray due to heat treatment.

Description

[0001] MOLD FIXED DEVICE FOR HEAT TREATMENT TRAY [0002]

The present invention relates to a mold fixing apparatus for a heat treatment tray.

Specifically, in a heat treatment tray on which a mold for performing heat treatment is mounted for enhancing durability, in general, since the shape of the mold has various bends from spherical shape to cylindrical shape, To solve the problem,

The present invention relates to a mold fixing apparatus for a heat treatment tray, which is capable of fixing a mold by being detached and attached to a heat treatment tray, and which can solve the problem of sticking between the apparatus and the heat treatment tray due to heat treatment.

In the vacuum heat treatment, a metal material such as a steel is heated and / or cooled in a vacuum to regulate its properties. In this vacuum heat treatment, the product to be heat treated is placed on a structure called a tray and charged into a vacuum furnace. The tray uses a special material made of chromium (Cr) as a main material so as to withstand high temperatures.

This vacuum heat treatment prevents the surface reaction of the treated material (hereinafter referred to as " mold ") to maintain a clean surface having the original chemical composition of the mold material, remove contaminants on the surface of the mold, remove impurities from the mold (Metal molds) for the purpose of reducing the size of the metal molds. Since these molds vary in shape from spherical to cylindrical, there is a problem in that they are not firmly fixed to a conventional heat treatment tray for supporting the metal mold in the vacuum heat treatment.

Accordingly, the present applicant has come to draw attention to the present invention for the purpose of overcoming the above-mentioned problems.

As a related technique, a similar technique has not been searched, but as a technique for fixing a specific article to a tray, a fixing jig for a heat treatment apparatus of JP 10-1288656 and an automatic coating method for lamp coating using it are disclosed.

A plurality of longitudinal grooves are formed at a predetermined distance from a first end of the lamp housing. The lamp housing is inserted into the groove in the longitudinal direction of the lamp housing. A heat-treating jig for separating and fixing the lower part to a lamp; And a jig tray closing a part of the longitudinal groove so that heat is not transmitted to the lamp housing when the heat treatment jig is installed in the upper direction from the upper side and the tray hole is opened inward so that the lamp penetrates, , The heat treatment jig and the jig tray are made of a plate-like steel plate having a constant strength and a certain thickness.

However, the above-described technique has a structure in which the shape of the tray (jig) is deformed in order to fix a specific object to be processed, and the conventional tray can not be used when applied to a vacuum heat treatment. , It is not possible to apply other treatments other than the predetermined processed product, so that it is impossible to fix all of the molds having various shapes.

That is, the above-described technique is completely different from the present invention which the present applicant intends to propose.

On the other hand, during the heat treatment for vacuum heat treatment, a chromium (Cr) is a major component of the tray in the normal atmospheric pressure, but insoluble at a temperature of approximately 1907 ℃, when the vacuum ¹⁰ is lowered to ² torr ~ 10 ^-6 torr .

In this case, chromium (Cr) is scattered in the vacuum furnace during the heat treatment process to deposit on the surface of the product to be heat treated The product to be heat-treated is completely pressed on the surface of the product to be heat-treated in the course of cooling, or the product to be heat-treated is stuck to the tray. In such a case, usually, an external force is applied to carry out the separation operation. However, this external force causes damage and distortion of the product to be subjected to the heat treatment, thereby causing quality problems.

Therefore, the present applicant intends to solve the above-described problem by minimizing the contact area between the tray and the article to be heat-treated, and forming the protrusion on the surface of the tray so that the tray can disperse the load of the article to be heat-treated.

However, there are things to be cautious in the above case.

This is because the tray is used in the heat treatment process in the high vacuum heat treatment furnace (vacuum furnace). Therefore, when the projections are designed without numerical optimization, the projections may be easily broken due to the load of the product to be heat treated and heat at high temperature. There is a problem that one of the protrusions that are bent due to high-temperature heat sticks or fuses with other protrusions adjacent to the protrusions.

In addition, since the composition of the tray or the like is not changed, the fine surface protrusions may be broken due to continuous use. In this case, the protrusions are not entirely broken at one time, but are partially and sequentially broken can do. In this case, it is practically impossible to change the tray itself because the projections are damaged. However, if the projections are used in a damaged state, the quality of the product to be heat-treated is likely to be adversely affected.

Therefore, a technique capable of coping with breakage of the projections is also necessary.

Registered Patent Publication No. 10-1288656 (Bulletin of Feb. 23, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat treatment tray on which a mold for performing a heat treatment is mounted so as to enhance durability, and in general, as the shape of the mold is varied from spherical to cylindrical, There is provided a device for fixing a mold by being detached and attached to a heat treatment tray so as to solve the problems of sticking between the device and the heat treatment tray due to heat treatment, have.

According to another aspect of the present invention, there is provided a fixing apparatus for fixing a mold placed on a top surface of a heat treatment tray, the fixing apparatus comprising: a body to be partially inserted into a groove formed in a heat treatment tray; 10), and a fixing body (20) coupled to one side of the body (10) inserted in the groove of the heat treatment tray,

The fixing member 20 is coupled to the body 10 through the coupling member 21 and has a surface on which the fixing member 20 and the body 10 abut against each other and a surface of the coupling member 21 And a plurality of projections are arranged on the outer surface.

At this time, the body 10 has a second surface having a shorter length at both ends thereof vertically with respect to a first surface having a relatively long length, and has a cross-sectional shape of '└┘', and the first surface and the second surface A plurality of protrusions are arranged on the outer surface of the surface, and a plurality of through holes (10b) penetrating the first surface in the width direction of the surface are provided, thereby securing a heat path for heat treatment.

In addition, the second surface of the body 10 is constituted by a total of two, facing each other in parallel, a groove 10a is formed on each second surface, and the groove 10a has a height direction of the second surface And the upper side of the groove portion 10a is opened on the upper surface of the second surface so that the opened region is narrower than the lower groove portion 10a and the wider portion of the groove portion 10a is formed inside the groove portion 10a And a rotary shaft 12a that is formed to have a size corresponding to the area and does not fall off into the open area of the groove 10a.

Further, a first elongated body 12 having a plurality of protrusions arranged on the outer surface thereof is formed at an upper side of the rotating shaft 12a,

The first extension body 12 includes an end pillar extending vertically from the rotary shaft 12a, respective connecting pads connected to the upper and lower ends of the end pillar, and an end pillar between the end pillar and the pillar, And an insertion column having a parallel direction and connected perpendicularly to the coupling column,

The insert column is a pipe having a hollow interior and an open end, and the end passes through the upper joint post so that the upper side of the joint post is opened.

In addition, the insertion column has a fixing groove formed at one side of the inner side wall and recessed from the inner side wall from the lower end to the upper end, so that a step is formed at the upper end of the insertion column,

Wherein the concave fixing groove is formed so that two of the concave fixing grooves face each other, a second rotation shaft is inserted into the concave fixing groove,

A second elongated body 13 having a plurality of protrusions arranged on an outer surface of the second rotation shaft is extended, and the second elongated body 13 is separated from the inserted column by being released to the lower side of the inserted column, Is inserted into the column and is exposed to the upper side of the insertion column to be bent.

In addition, when the second extension body 13 is not inserted into the insert column and is in a hollow state, it is utilized as a path through which heat due to the heat treatment can move.

Further, a rotating body 14 is further provided on one side of the second surface of the body 10,

The hinge 14b is inserted into the hollow portion of the rotary body 14 so as to be connected to both of the two second surfaces. The hinge 14b is inserted into the hollow portion of the rotary body 14, and a concave groove 14aa A hinge cover 14a on which a hinge cover 14a is formed; A separation prevention cap fitted to both ends of the hinge 14b exposed from both ends of the hinge cover 14a; A support plate 14c formed on the departure-preventing cap and rotatable about the hinge 14b; And a support plate (14c) which is bent at one side thereof in the direction of the hinge cover (14a)

And a latching protrusion 14d which is formed in the shape of a protrusion and is engaged with the recessed groove 14aa of the hinge cover 14a to fix the support plate 14c,

A plurality of protrusions are arranged on the outer surface of the hinge 14b which is inserted into the hinge cover 14a and on the curved inner wall of the locking protrusion 14d.

The protrusions are formed to have a total height (h, high) of 3 to 5 mm, a width (w, width) of 1.8 to 2.2 mm and a gap (g, gap) of 2 mm.

Further, in the case where the protrusion is broken, the protrusion is reshaped by using the stud welding.

In addition, in order to reform the protrusions,

After determining that the damaged area is within a certain range,

If all the protrusions are polished, the protrusions are all re-formed in the area of the surface of the fixation device where the protrusions are to be formed by using the stud welding,

If it is less than the predetermined range, only the broken protrusions are polished, and protrusions corresponding to the polished area are prepared, and protrusions prepared in the polished area are re-formed using stud welding.

According to the mold fixing apparatus for a heat treatment tray according to the present invention,

It is possible to variously fold the body 10, the first elongated body 12 and the second elongated body 13 for fixing, and by driving the rotating body 14,

It has an effect that all the molds can be fixed to the heat treatment tray in correspondence with the shapes of various molds put on the heat treatment tray.

When the mold is placed in the heat treatment tray and heat treatment is performed in the high vacuum heat treatment furnace, the structures of the body 10, the first elongated body 12 and the second elongated body 13 can smoothly move the radiant heat due to the heat treatment So that the heat treatment can be efficiently performed.

Further, there is an advantage that it is possible to prevent sticking between the respective structures of the mold and between the mold and the heat treatment tray by the projection.

Further, by proposing the optimum value of the protrusions, there is an advantage that the breakage rate is reduced, and even if broken, a plurality of the protrusions are stuck between the finely arranged protrusions to prevent chain breakage.

1 schematically shows the structure of a mold fixing apparatus for a heat treatment tray according to the present invention.
2 is an enlarged view of the structure of a rotating body in the mold fixing apparatus for a heat treatment tray according to the present invention.
FIG. 3 shows an example in which the mold fixing apparatus for a heat treatment tray according to the present invention is fixed to a tray.
FIGS. 4 to 6 illustrate an example of fixing the mold on the upper side of the tray through the mold fixing apparatus for a heat treatment tray according to the present invention.
7 is a view showing a protrusion formed in a mold fixing apparatus for a heat treatment tray according to the present invention.
Fig. 8 shows that the protrusions are polished according to the area damaged in the protrusions. Fig. 8 shows the total polishing (a) and partial polishing (b).
Fig. 9 shows a process of polishing the projections and reshaping the projections on the polished portions.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor can properly define the concept of the term to describe its invention in the best possible way And should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and drawings are only the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents And variations are possible.

Before describing the present invention with reference to the accompanying drawings, it should be noted that the present invention is not described or specifically described with respect to a known configuration that can be easily added by a person skilled in the art, Let the sound be revealed.

Example 1. Fixing device for heat treatment tray

The mold fixing apparatus for a heat treatment tray according to the present invention will be described with reference to the accompanying drawings.

1 schematically shows the structure of a mold fixing apparatus for a heat treatment tray according to the present invention.

1 of the accompanying drawings is mainly composed of a body 10 and a fixture 20.

FIG. 3 shows an example in which the mold fixing apparatus for a heat treatment tray according to the present invention is fixed to a tray.

Referring to FIG. 3 of the accompanying drawings, a body 10 and a fixing body 20 are coupled to each other, and a hole (not shown) formed in a tray T is inserted into an insertion body 11 And the engaging member 21 of the fixing member 20 is engaged with the groove to form a groove on the lower side of the insertion body 11 so as to be exposed to the opposite end of the tray T Lt; / RTI >

At this time, the body 10 and the fixing body 20 must be detached and attached. Since the apparatus according to the present invention is included in the heat treatment furnace and is heat-treated at a high temperature,

The mold fixing apparatus for a heat treatment tray according to the present invention is a heat resistant steel which is alloyed with nickel (Ni) and chrome (cr) so as to have heat resistance at a high temperature and is one of 13 kinds of HRSC, 15 kinds, 22 kinds, Use what you are satisfied with.

In addition, since the chromium melts and adheres to other adjacent structures, even if it is made of the heat resistant steel as described above, any one of the bottom surface of the insertion body 11 of the body 10 and the upper surface of the fixture 20 A plurality of projections may be arranged on one surface.

Such protrusions will be described in detail in Embodiment 2 described below. The protrusions can prevent the body 10 from completely sticking between the body 10 and the fixture 20, and after the heat treatment, the protrusions are hit by a hitting means such as a hammer, (10) and the fixing body (20) can be separated.

Further, a plurality of projections may be arranged on the outer surface of the engaging member 21 of the fixture 20 as well. Accordingly, it can be easily separated after being inserted into the groove formed in the bottom surface of the insertion body 11.

Specifically, the body 10 has a cross-sectional shape of "└┘", and a second face having a short length at both ends thereof may be formed vertically with respect to a first face having a relatively long length. At this time, the insertion body 11 may be formed on the bottom surface of the long side.

Further, a plurality of through holes 10b penetrating in the widthwise direction may be formed on the first surface. Accordingly, the efficiency of the heat treatment can be increased as the radiant heat due to the heat treatment is passed along the through hole 10b of the first surface.

The second surface is composed of two in total and faces in parallel, and a groove 10a may be formed in each of the second surfaces.

As shown in the enlarged view of FIG. 1 of the accompanying drawings, the groove portion 10a extends along the height direction of the second surface, the upper side of the groove portion 10a is opened on the upper surface of the second surface, And the open region is formed to be narrower than the groove portion 10a on the lower side.

Further, a plurality of projections may be arranged on the first and second surfaces of the body 10.

A rotary shaft 12a is accommodated in the groove 10a so that the rotary shaft 12a has a size corresponding to a wide area of the groove 10a so that the rotary shaft 12a does not fall into the open area of the groove 10a .

On the upper side of the rotating shaft 12a, the end column of the first elongated body 12 extends in the vertical direction. The connecting pillars are connected to the upper and lower ends of the end pillars,

So that the first elongated body 12 is formed.

Further, between the end pillar and the pillar of the first extension body 12, there is formed an insertion pillar having a direction parallel to the end pillar and connected perpendicularly to the pillar,

The first elongated body 12 is finally configured to be in the shape of an iron. Accordingly, by securing a space in which the radiant heat can move due to the heat treatment, the amount of radiant heat reaching the outer surface of the mold increases, thereby increasing the heat treatment efficiency.

On the other hand, the insert column is a pipe having an inner hollow state and an open end, and the end portion penetrates the upper joint column to form an open region on the upper joint column.

The second extension body 13 is inserted into the insertion pillar. At this time, although not shown in the drawing, the insertion pillar may be formed at one of the inner sidewalls with a fixing groove concave to the inner sidewall from the lower end to the upper end . Therefore, the concave fixing groove of the inner side wall of the insertion column forms a step shape at the upper end of the insertion column.

These concave fixing grooves are configured in two opposing shapes, and although not shown in the figure, the second rotation shaft can be received in the insert column in such a manner that both ends thereof are inserted into the two concave fixing grooves. And the second elongated body 13 can be extended to the second rotational shaft. The second elongated body 13 may be configured to be folded once after it is exposed in the first elongated body 12, further including a hinge configuration (not shown) so that the second elongated body 13 can be rotated.

With this structure, the second elongated body 13 can be separated from the lower end of the inserted column and separated, and inserted into the inserted column when necessary.

At this time, when the second elongated body 13 is not inserted into the insertion column and the inside of the insertion column is hollow, the movement path of radiant heat due to the heat treatment is increased. If a plurality of dies It is expected that radiant heat is radiated along the hollow inside the insert column so that the radiant heat is transferred to another adjacent mold so that the heat treatment efficiency can be increased.

At this time, a plurality of protrusions may be arranged on the outer surfaces of the first extension body 12 and the second extension body 13. Accordingly, even if the first elongated body 12 or the second elongated body 13 are stuck to the mold when the first elongated body 12 and the second elongated body 13 are brought into contact with the mold and subjected to the heat treatment, It can be easily separated.

The first extension body 12 is inserted into the groove 10a or the second extension body 13 is inserted into the insertion column so as to be thermally treated so that the impact is applied to the hitting means from outside, So that it can be exposed again.

Meanwhile, a rotating body 14 may be formed at one end of the second surface of the body 10.

The rotary body 14 is angularly adjusted from the body 10 so as to support the mold in order to prevent the mold from being sagged during the heat treatment. For this purpose, the rotary body 14 also has a plurality of projections Which will be described in detail with reference to FIG. 2 of the accompanying drawings.

2 is an enlarged view of the structure of a rotating body in the mold fixing apparatus for a heat treatment tray according to the present invention.

2 of the accompanying drawings mainly includes a hinge cover 14a, a hinge 14b, a support plate 14c, and a locking protrusion 14d.

The hinge cover 14a is long and connected to the two second surfaces. The hinge cover 14a is hollow and has open ends. The hinge 14b is inserted into the hinge cover 14a, As shown in FIG.

In order to prevent the hinge 14b from being detached from the hinge cover 14a as shown in FIG. 2, a separation prevention cap having a larger diameter than the hinge 14b may be formed at each end of the hinge 14b.

At this time, a plurality of protrusions may be arranged on the outer circumferential surface included in the hinge cover 14a of the hinge 14b. This is to prevent the inner surface of the hinge cover 14a from sticking to the hinge 14b by heat treatment at a high temperature.

Also, since the plurality of protrusions are formed on the inner surface of the release-preventing cap formed at each end of the hinge 14b, the hinge 14b and the escape prevention cap are separated from each other through an external force by the hitting means, The hinge cover 14a can be separated from the hinge cover 14a by pushing the hinge 14b in the opposite direction in one direction. In this case, there is an advantage that the hinge cover 14a and the hinge 14b can be separated from each other, The hinge 14b can help repair the protrusion formed on the outer circumferential surface.

It will be understood by those skilled in the art that the inner diameter of the hinge cover 14a may be equal to or slightly larger than the total outer diameter of the protrusion of the hinge 14b.

On the other hand, the hinge cover 14a has a '

In particular, the concave groove 14aa can be formed along the longitudinal direction of the hinge cover 14a by forming the concave upper portion of the connecting structure.

Further, a support plate 14c may be connected to one side of the departure prevention cap. Since the support plate 14c must be able to rotate without being restricted by the hinge cover 14a, the support plate groove 14ca may be formed at the end of the support plate 14c in the direction of the hinge cover 14a.

In addition, at one side of the end of the support plate 14c where the support plate groove 14ca is formed, the engagement protrusion 14d is bent in the direction of the hinge cover 14a,

'May be formed.

Further, a plurality of projections may be arranged on the inner side surface of the engaging projection 14d.

Thus, when the support plate 14c is lifted by rotating the hinge 14b about its axis, the engaging protrusion 14d can be engaged with the recessed groove 14aa of the hinge cover 14a to fix the support plate 14c However,

After the heat treatment is completed, the support plate 14c or the like is hit by the hitting means to break the projections on the inner side surface of the engaging projection 14d, thereby eliminating the sticking of the recess 14aa with the predetermined external force, So that the locking protrusion 14d can be separated from the recessed groove 14aa and return to its original position.

In addition, a plurality of protrusions may be arranged on one surface of the support plate 14c so that an area contacting the mold can be easily separated from the mold even after the heat treatment.

Hereinafter, an embodiment of the mold fixing apparatus for a heat treatment tray according to the present invention will be described with reference to FIGS. 4 to 6 of the accompanying drawings.

FIGS. 4 to 6 illustrate an example of fixing the mold on the upper side of the tray through the mold fixing apparatus for a heat treatment tray according to the present invention.

4, the body 10, the first elongated body 12, and the second elongated body 13 are folded in the form of "┌┐" when the mold placed on the heat treatment tray is in the shape of a sphere , It is possible to fix the sphere type mold so that it does not roll on the upper side of the heat treatment tray.

As shown in FIG. 5 of the accompanying drawings, when the metal mold put on the heat treatment tray is a pipe having a curvature such as an elbow, the body 10, the first elongated body 12 and the second elongated body 13 are referred to as' ', While a part of the second elongated body 13 is rotated in the downward direction and the remaining part of the second elongated body 13 is rotated in the upward direction so as to rest against the metal mold.

As shown in FIG. 6 of the accompanying drawings, when the metal mold put on the heat treatment tray is a cylinder having various diameters such as a shaft axis, a portion with a small diameter of the end portion may be struck by the high temperature due to the heat treatment, When the mold is used as a part, it has a large influence on the product error.

In this case, it is possible to prevent stitching by supporting the area to be stitched from the lower side through the rotating body 14 formed at one side of the body 10.

Although not illustrated in the above-described structure, the rotating body 14 formed at one side of the second region of the body 10 can be constructed by welding the hinge cover 14a to the second region However,

According to the design conditions, the body 10 and the rotary body 14 are separated from each other. On one side of the second region of the body 10, And one side of the lower end of the multi-stage of the column may be welded to the second region.

At this time, it is natural that a plurality of protrusions are arranged on the outer surface of one of the ends of the length-adjustable column, so that it is possible to release the sticking even if they are stuck in a high temperature environment due to the heat treatment.

The hinge cover 14a can be welded to one side of the uppermost one of the multi-stages of the column.

Accordingly, it is possible to adjust the height of the rotary body 14, so that it is possible to adjust and support the rotary body 14 in accordance with the height of the construction, which is likely to occur.

Hereinafter, the projection according to the present invention will be specifically described below.

Example 2. The projection formed on the mold fixing device for the heat treatment tray

As shown in FIG. 7A of the accompanying drawings, the protrusions have a total height (h, high) of 3 to 5 mm, a width (w, width) of 1.8 to 2.2 mm, And a height (h1, curved portion) of 1 mm. In other words, the height of the protrusion except for the height of the head (h2) is 2 to 4 mm.

As shown in FIG. 7 (b), since the protrusions g of the protrusions are all 2 mm, the protrusions of the other protrusions adjacent to each other in the upper, lower, left, right and diagonal directions of the protrusions are continuous .

In addition, the head of the projection may have a curved hemisphere shape as described above, or may have a sharp needle shape formed to be inclined after the remaining height h2 excluding the height of the head.

As a result, the area of contact of the projections with the product to be heat treated can be minimized.

At this time, the technical significance of limiting the width (w) of the projections to 1.8 to 2.2 mm,

When the width (w) is less than 1.8 mm, the protrusion touching the mold can not withstand the load or pushing of the mold, and breakage such as breakage occurs,

If the width w exceeds 2.2 mm, the following problem arises.

The heat treatment tray is made of special material made of chromium (Cr) as its main material.

The chrome (Cr) is the atmospheric pressure, only green from approximately 1907 ℃, the vacuum state, the degree of vacuum is ¹⁰ is splashed to the low ⁶ torr an irregular inside a high vacuum heat treatment ^- ² to 10 torr.

The remaining part of the chromium (Cr) scattered in this manner is deposited on the surface of the mold, and the mold and the apparatus (or the heat treatment tray) according to the present invention are prevented from sticking to each other during the process of cooling to room temperature. In order to remove the remainder of chromium (Cr), a separate external force must be applied. In this process, the product to be heat-treated is damaged and deformed, which affects quality.

That is, the reason why the protrusions are formed on a part of the surface of the device as in the present invention is to minimize the contact area in order to minimize sticking of the mold and the fixing device according to the present invention. (w) of more than 2.2 mm, there was no difference in area of the fixing device according to the present invention when the projections were not formed.

The following is a table.

When the width (w) exceeds 2.2 mm
(Experimental group) When no protrusion is formed
(Control group) Mold area: 27 ~ 31% Mold area: 30 ~ 35%

In Table 1, it can be seen that the experimental group showed a decrease in the squeeze area compared to the control group, but when the width (w) was 1.8 to 2.2 mm, the area of the mold was 5 to 7% (2.3 mm) when the width (w) exceeds 2.2 mm (experimental group) can be seen to be significant compared with the control group.

That is, in the following, the present applicant has evaluated the optimum height and spacing of projections in a state where the width w of the projections having the above technical significance is limited to 1.8 to 2.2 mm.

Experimental Example 1. Evaluation of Optimal Height of Projections

(Experimental Method)

Experimental example 1 is for evaluating the optimum height of the projections with the width w set to 1.8 to 2.2 mm according to the above evaluation. In a state where the width w is fixed to 2 mm which is a median value of 1.8 to 2.2 mm, The height (h) was adjusted. Experiments were also carried out with the mold placed on the device to receive the load of the mold in the direction of the device with the protrusions.

Then, the molds to be actually used are put on the experimental groups set as shown in the following [Table 2], and the evaluation is performed by (a) evaluation for the time required for the normal heat treatment and (b) actual heat treatment.

(Experiment result)

Experiment 1 Experiment 2 Experiment group 3 Experiment group 4 Experiment group 5 Experiment group 6 Experiment group 7 Experiment group 8 Experiment group 9 Height (h) 2.5 3 3.5 4 4.5 5 5.5 2.9 5.1 Rating 1 abnormal normal normal normal normal normal abnormal normal abnormal Rating 2 abnormal normal normal normal normal normal abnormal abnormal abnormal

* Evaluation 1: Evaluation to raise during the time required for a normal heat treatment

* Evaluation 2: Evaluation by actual heat treatment

As shown in [Table 2], the experimental group 2 to the experiment group 6 with the height (h) of 3 to 5 mm were normal with no breakage of the protrusions in the two experiments.

However, in the experimental group 1 (2.5 mm) and the experimental group 7 (5.5 mm) with the height (h) of 0.5 mm, it appeared abnormally in both of the experiments, and was adjusted to ± 1 mm at 3 mm and 5 mm Experimental group 8 and experiment group 9 were tested. In experiment group 8, which had a height (h) of 2.9 mm, the protrusions were not damaged when the heat treatment was not performed. However, in the actual heat treatment in the high vacuum heat treatment furnace, It was found that the protrusions were hard to reuse due to heavy wear during the heat treatment process once, and the surface of the fixing device adhered to the mold surface at another portion. This is probably due to the height of the projection h being too low.

On the other hand, in Experiment 9, in which the height (h) was set to 5.1 mm, the protrusions were broken in both the evaluation without heat treatment and the evaluation with heat treatment.

Therefore, it was found that the height (h) of the projection was optimal from 3 to 5 mm.

Experimental Example 2. Evaluation of Optimal Spacing of Projections

(Experimental Method)

Experimental Example 2 shows the case where a plurality of protrusions are arranged in a state in which the height h of the protrusions is 3 to 5 mm based on Experimental Example 1 described above and the intermediate value is fixed to 4 mm and the width is fixed to 2 mm, We want to evaluate the optimal spacing of these.

For this, the experimental method of Experimental Example 2 was set as experimental group by varying the width in the range of 1.5 to 2.5 mm in increments of 0.1 mm as in the experimental groups shown in Table 3 below. In the actual high vacuum heat treatment furnace, And the state of the protrusion was evaluated.

However, since the protrusions formed on the mold are not improved in durability against high temperature as in the present invention, it is emphasized in advance that the phenomenon of abrasion or melting and warping occurs in the continuous heat treatment.

Experimental group evaluation 10 1.5mm 6th warp occurred. Adheres to other nearby protrusions. 11 1.6mm Eighth warp occurred. Adheres to other nearby protrusions. 12 1.7mm 9th warp occurred. Adheres to other nearby protrusions. 13 1.8mm 9th warp occurred. No abnormality other than occurrence of warpage even when used up to 10 times. 14 1.9mm Eighth warp occurred. No abnormality other than occurrence of warpage even when used up to 10 times. 15 2.0mm No abnormality until 10th. 16 2.1mm 9th warp occurred. No abnormality other than occurrence of warpage even when used up to 10 times. 17 2.2 mm 9th warp occurred. No abnormality other than occurrence of warpage even when used up to 10 times. 18 2.3mm 7th occurrence of bending and breaking. 19 2.4 mm 7th occurrence of bending and breaking. 20 2.5 mm 6th occurrence of bending and breaking.

As shown in [Table 3], when the gap (g) between the projections was 1.8 to 2.2 mm as in Experiment Groups 13, 14, 16 and 17, no abnormality other than the warping phenomenon was found, When the gap g is 2 mm, no warping phenomenon or the like is found until the 10th time.

This is because when the height h of the projection is 3 to 5 mm and the width w is 1.8 to 2.2 mm as described above, the gap g of the projection is 1.8 to 2.2 mm, more preferably 2 mm .

When the spacing g of the protrusions is less than 1.8 mm, the protrusions adjacent to each other abut against each other at a height of 3 to 5 mm and a width of 1.8 to 2.2 mm, A sticking phenomenon was found.

As described later, the worn protrusions can be re-formed and used again. If the adjacent protrusions stick to each other, only the protrusions in some areas can not be re-formed, and the entire surface needs to be re-formed.

Also, if the gap g of the protrusions exceeds 2.2 mm, the protrusions can not withstand the load of the product to be heat-treated and are easily broken.

This is considered to be caused by the fact that the load distribution of the product to be heat treated is not evenly distributed as the distance of the protrusions becomes distant.

The optimal projection shape having the protrusions for preventing the occurrence of the cracks according to the present invention has a height h of 3 to 5 mm, a width w of 1.8 to 2.2 mm and an interval g of 1.8 to 2.2 mm 2 mm).

Since they are not durable with heat at high temperature by changing the composition, there is a possibility that the projections melt or break due to continuous use.

Accordingly, in the present invention, it is proposed to polish and remove broken protrusions and to reshape the protrusions on the surface of the fixing device.

Fig. 8 shows that the protrusions are polished according to the area damaged in the protrusions. Fig. 8 shows the whole polishing (a) and partial polishing (b). Fig. 9 shows a state in which the protrusions are polished, FIG.

At this time, as shown in FIG. 8A, the whole projection can be polished through a large grinder or a polishing apparatus. This may be done by using a hand grasping type grinder as shown in FIG. 8 (b), but for the sake of convenience, an apparatus as shown in FIG. 8 (a) can be used.

The blade portion of the polishing apparatus may be slidably moved and moved in the longitudinal direction of the polishing apparatus, and the blade portion may be moved in the width direction of the polishing apparatus by adjusting the length in a telescopic manner.

However, in order to prevent the surface, groove or hole configuration of the fixing device according to the present invention from being polished during the polishing process by the polishing apparatus, when the blade part is connected to the cover covering the blade part at the upper part, Spring) is provided so that when the blade part is polished, when it comes into contact with the projection, it is shaken upward due to the elastic force.

Therefore, in the process of polishing the projections, the blade portion swings to the upper and lower portions, and the projections are continuously polished while reciprocating in the longitudinal direction or the width direction of the polishing apparatus. I will not give it.

Further, only a part of the protrusion can be polished through a grinder of the shape held by the hand as shown in Fig. 8 (b). Depending on the example, the enlarged drawing (inside the white circles) shown in Fig. 8 The protrusions are made of a material that can be polished in the same manner as the blade portion, one end of the protrusions is perpendicular to one end of the blade portion of the grinder, and the other end is a predetermined .

Therefore, only the protrusions of the desired area to be polished can be polished without affecting the protrusions to be polished.

In other words, as shown in FIG. 8 of the accompanying drawings, in the present invention, if the area of the broken protrusion is small, only the corresponding area may be partially polished to reprocess the protrusion only in the polished area, It is possible to polish the entire projections and to re-form only the projections on the surface from which the projections have been completely removed.

According to FIG. 9 of the accompanying drawings, the process of re-

(1) Judging whether the breakage area is over a certain range -> (2) After polishing the whole protrusion -> (4) If the protrusion is reshaped by using stud welding,

(1) Determine whether the breakage area is over a certain range. -> (3a) After polishing the broken protrusion only if it is below a certain range -> (3b) 4) Re-form the protrusion using stud welding.

At this time, the stone substrate may be a stone substrate corresponding to the corresponding area, or may be cut by a corresponding area of the protrusion manufactured to a full size.

At this time, the stud welding is a kind of arc welding by melting the object to be welded and then planting it. A welding method in which a welding object (a plate) is brought into contact with a base material (a tray for heat treatment), an electric current is allowed to flow through the welding object, an arc is generated by slightly pulling the object to be welded, to be.

Thus, since the projections are formed on the heat treatment tray by using the stud welding, the time required for joining the heat treatment tray and the projections can be reduced.

It is apparent that the present invention is not limited to the configuration of the drawings, as described above with reference to the drawings, only the main points of the present invention are described, and various designs can be made within the technical scope thereof.

10: Body
10a:
10b: Through hole
11: Insert body
12: first extension body
12a:
13: second extending body
14: rotating body
14a: Hinge cover
14aa: concave groove
14b: Hinge
14c:
14ca: Support plate groove
14d:
20:
21:

Claims

A fixing device for fixing a metal mold seated on an upper surface of a heat treatment tray,
A body 10 into which a part is inserted into a groove formed in the heat treatment tray,
And a fixing body (20) coupled to one side of the body (10) inserted into the groove of the heat treatment tray,
The fixing body 20 is engaged with the body 10 through the coupling member 21,
Wherein a plurality of projections are arranged on at least one of surfaces of the fixing body (20) and the body (10) and at an outer surface of the engaging member (21).

The method according to claim 1,
The body (10)
A second surface having a shorter length at both ends is vertically formed with respect to a first surface having a relatively long length, and has a cross-sectional shape of '
A plurality of projections are arranged on outer surfaces of the first surface and the second surface,
Wherein a plurality of through holes (10b) penetrating in the width direction of the first surface are formed on the first surface to secure a heat path for heat transfer.

The method of claim 2,
The second surface of the body 10 is composed of a total of two, facing each other in parallel, a groove 10a is formed in each second surface,
The groove portion 10a extends along the height direction of the second surface and the upper side of the groove portion 10a is opened on the upper surface of the second surface and the open region is configured to be narrower than the lower groove portion 10a,
And a rotation shaft 12a which is formed in the inner side of the groove 10a and has a size corresponding to a large area of the groove 10a and which is not detached from the open area of the groove 10a, Mold fixing device for heat treatment trays.

The method of claim 3,
On the upper side of the rotating shaft 12a, a first elongated body 12 having a plurality of protrusions arranged on its outer surface,
The first extension body (12)
An end column vertically extending from the rotating shaft 12a,
Each of the joint pillars connected to the upper and lower ends of the end pillars,
An insertion pillar having a direction parallel to the end pillar between the end pillar and the pillar and connected perpendicularly to the pillar,
The insert pillar
And the upper end of the connecting column is opened by passing the upper end of the upper end of the connecting column through the upper end of the upper end of the connecting column.

The method of claim 4,
The insertion column has a fixing groove formed at one side of the inner side wall and concave to the inner side wall from the lower end to the upper end, thereby forming a step at the upper end of the insertion column,
Wherein the concave fixing groove is formed so that two of the concave fixing grooves face each other, a second rotation shaft is inserted into the concave fixing groove,
A second elongated body 13 having a plurality of protrusions arranged on an outer surface of the second rotation shaft is extended, and the second elongated body 13 is separated from the inserted column by being released to the lower side of the inserted column, Is inserted into the column so as to be exposed to the upper side of the insert column and bent.

The method of claim 5,
Wherein the second extension body (13) is not inserted into the insert column and is used as a path through which heat due to the heat treatment can move when the insert body is in a hollow state.

The method of claim 2,
Further comprising a rotating body (14) on one side of the second side of the body (10)
The rotating body (14)
The hinge cover 14a is formed so as to be connected to both of the two second surfaces and has a hollow inside, a hinge 14b inserted therein, and a concave groove 14aa formed on an upper side of the hinge cover 14a );
A separation prevention cap fitted to both ends of the hinge 14b exposed from both ends of the hinge cover 14a;
A support plate 14c formed on the departure-preventing cap and rotatable about the hinge 14b; And
The support plate 14c is provided at one side thereof with a curved "

And a latching protrusion 14d which is formed in the shape of a protrusion and is engaged with the recessed groove 14aa of the hinge cover 14a to fix the support plate 14c,
Wherein a plurality of protrusions are arranged on the outer surface of the hinge (14b) inserted into the hinge cover (14a) and on the curved inner wall of the locking protrusion (14d).

The method according to claim 4 or 7,
The projection,
Wherein the mold is formed to have a total height (h, high) of 3 to 5 mm, a width (w, width) of 1.8 to 2.2 mm and a gap (g, gap) of 2 mm.

The method of claim 8,
And the projections are re-formed by using stud welding when the projections are broken.

The method of claim 9,
Reforming the protrusions may be accomplished,
After determining that the damaged area is within a certain range,
If all the protrusions are polished, the protrusions are all re-formed in the area of the surface of the fixation device where the protrusions are to be formed by using the stud welding,
And if it is less than the predetermined range, only the broken protrusions are polished, and protrusions corresponding to the polished area are prepared, and the projections prepared in the polished area are re-formed using stud welding.