JP2007138220A - Method and apparatus for die-quenching ring type article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for die-quenching a ring type article with which the die-quenching having little thermal-deformation and good precision can be performed even with comparatively simple working order and a constitution and the die-quenching with the optimum contacting surface angle for obtaining the most suitable deformation-preventive effect can be performed. <P>SOLUTION: The die-quenching method for ring-type article contains: a heating process for heating the ring type article 10 to the quenching temperature; and a cooling process for cooling under state of pressing restrictive dies 11, 12, with which one side of the peripheral edge between the outer peripheral edge and the inner peripheral edge in the both surfaces of the ring type article 10 is inclined toward the other side of the peripheral edge with the increase of separation distance from the ring type article 10 and this inclination becomes larger with the increase of separation distance from the ring type article in the axial direction. This die-quenching apparatus is provided with a heating part and a cooling part, and the cooling part has an upper/lower die holding means which can hold the restrictive die 11 so as to press against the peripheral edges in upper/lower side surfaces of the ring type article 10 whose both surfaces direct to the upper and the lower sides. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ring quenching method and apparatus for quenching a ring-shaped product such as a bearing race using a constraining die.

When quenching a ring-shaped product such as a bearing ring, the ring-shaped product 10 is placed in a cylindrical constraining die 13 as shown in FIG. 11 in order to prevent thermal deformation and to adjust the roundness. Cooling is done. Specifically, after the ring-shaped product 10 is heated to the quenching temperature (about 850 ° C.), it is cooled to a temperature near the martensite transformation point (230 ° C.) without being constrained, and when the temperature decreases to the same temperature, the ring shape The product 10 is put into the constraining die 13 and cooled to a certain temperature (about 110 ° C.) in that state. When the product is cooled to the same temperature, the ring-like product 10 is taken out from the constraining die 13 and then naturally cooled to room temperature.
The reason for such a cooling method can be explained by the graph of FIG. That is, when the bearing steel such as SUJ material is heated to the quenching temperature and then rapidly cooled, it contracts to the martensite transformation point Ms, but expands when the martensite transformation point Ms is reached. Therefore, by constraining the ring-shaped product in the vicinity of the martensite transformation point Ms, the ring-shaped product expands and is pressed against the constraining die as it is cooled below it, so that it is the same as the shape of the constraining die. The plastic deformation is performed. For this reason, the predetermined shape and dimension with little thermal deformation are obtained.

  However, when quenched by the above method, the ring-shaped product expands and fits tightly into the constraining mold, so it is not easy to separate the ring-shaped product from the constraining mold after quenching. Actually, the ring-shaped product is removed from the constraining die by hitting it in the axial direction with a punch, but this operation is time-consuming. In addition, since it is completely restrained in the radial direction, internal distortion occurs in the ring-shaped product during mold quenching, and this tends to appear as a warp of the end face (shown by A in FIG. 11).

  Therefore, a vertical cylindrical shape that is long in the axial direction is used as the constraining die, and the ring-shaped product is pushed into the vertical cylindrical constraining die in order from the upper side. Patent Document 1 discloses a proposal in which the ring-shaped product is cooled while being pushed out in order and staying in the mold. With this configuration, it is not necessary to take out the ring-shaped product from the constraining die, and the ring-shaped product can be quenched and taken out continuously. Further, since the radial restraint is moderate, the end face is less likely to warp.

Also, as another tentative plan, it is possible to change the effective diameter of the constraining mold and to allow the ring-shaped product to be easily taken out from the constraining mold by expanding the effective diameter of the constraining mold after quenching by mold constraining. It has been.
JP 09-176740 A

  However, in the proposed example of Patent Document 1, the ring-shaped product is held in the mold by the frictional force between the constraining mold and the ring-shaped product. There is a possibility of falling. Further, since the ring-shaped product is continuously pushed into and taken out from the constraining mold, it is not suitable for manufacturing a small-volume production of the ring-shaped product. Therefore, this proposed example can be applied only in the case of a special condition of a relatively small ring-shaped product produced in large quantities, and cannot be applied to quenching of ring-shaped products in general.

  On the other hand, in the case of the tentative plan, a mechanism for changing the effective diameter of the constraining mold is required, and it is necessary to apply pressure so that the effective diameter of the constraining mold does not change during mold quenching. Since this pressure requires a load load exceeding several tens tons to 100 tons, it is conceivable that the apparatus becomes larger and the operating cost becomes higher.

  Under such a background, as shown in FIG. 13 and FIG. 14, the ring-shaped product 10 heated to the quenching temperature is attached to one of the outer peripheral edge and the inner peripheral edge on both surfaces thereof. It tried to cool and quench in the state which pressed the pair of restraint type | molds 11 and 12 which incline so that it may approach the other peripheral side as it leaves | separates from 10 to an axial direction. According to this quenching method, thermal deformation in the axial direction and the radial direction is suppressed, and quenching is performed with high accuracy for roundness and flatness. This was confirmed by testing.

  The outline of the test is shown for reference. As the test piece, a bearing outer ring having the shape and dimensions shown in FIG. 15 was used. The test piece was primarily cooled from 840 ° C. to around 230 ° C. without being constrained by the mold, and then subjected to secondary cooling to around 100 ° C. while confining the mold. And the outer diameter after primary cooling and after secondary cooling was measured. The measurement position of the outer diameter was set to the vicinity of both edges (circle 1 and circle 3 in FIG. 15), and the average value of both was calculated. The test results are shown in Tables 1 and 2. Table 1 shows the amount of deformation, and Table 2 shows the machining allowance in grinding after die quenching. FIG. 16 is a graph showing the test results in Table 1.

  As described above, the mold quenching method using the constraining molds 11 and 12 is effective for preventing the deformation of the thin ring-shaped product, but the deformation preventing effect is the contact surface of the constraining molds 11 and 12 with the ring-shaped product 10. There seems to be a difference depending on the angle θ between 11a and 12a. That is, when the contact surface angle θ is large, the effect of preventing radial deformation and increasing the roundness is large, and when the contact surface angle θ is small, the effect of suppressing warpage and increasing the flatness tends to be large. It is expected that there will be. However, since the constraining molds 11 and 12 have a uniform contact surface angle θ, it is difficult to obtain an optimal deformation prevention effect according to conditions such as the shape, type, and application of the ring-shaped product. If a large number of constraining molds having different contact surface angles θ are prepared, it is possible to cope with various conditions, but this is not practical because of high cost.

  An object of the present invention is a contact surface for a constraining ring-shaped product that can perform mold quenching with a high degree of accuracy with respect to roundness, etc., while having a relatively simple work procedure and configuration. It is intended to provide a mold quenching method and apparatus for ring-shaped products that can perform mold quenching by changing the angle of the mold.

  The mold quenching method of the ring-shaped product according to the present invention includes a heating process for heating the ring-shaped product to a quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both sides of the ring-shaped product. And a cooling process of cooling with the constraining die pressed against the ring-shaped article so that the inclination is closer to the other peripheral side, and the inclination is larger or smaller toward the axial direction from the ring-shaped product. To do.

According to this method, when the ring-shaped product heated to the quenching temperature is cooled, the constraining mold with the contact surface inclined as described above is pressed against the periphery of the ring-shaped product. Thus, cooling is performed in a state in which the expansion and the expansion in the radial direction are constrained, the thermal deformation in both directions is suppressed, and the roundness and the flatness are quenched with high accuracy. However, the deformation in both directions is not completely constrained, but a slight deformation is allowed. Therefore, internal distortion or the like hardly occurs, and the end face is less warped. After quenching is completed, the ring-shaped product can be easily removed from the constraining mold by simply separating the upper and lower constraining molds from each other. In addition, since the constraining die and the ring-shaped product are in contact with each other with a line, the constraining die is not easily affected by heat from the ring-shaped product, and the durability of the constraining die is good.
Since the inclination of the contact surface increases or decreases with increasing distance from the ring product in the axial direction, the angle of the contact surface with respect to the ring product can be changed by changing the position of the contact surface with which the ring product contacts. Can do. For this reason, mold quenching can be performed with an arbitrary contact surface angle with which an optimal deformation preventing effect can be obtained with one type of constraining mold.
The pressure for pressing the constraining die against the ring-shaped product is only required to maintain the constrained state, and does not need to be increased so much. For this reason, the self-weight of the restraint mold and the member supporting the restraint mold can be used as the pressure, and the mechanism for pressing the restraint mold against the ring-shaped product can be simplified.

The constraining mold may be an integral ring. When the constraining die is an integral ring shape, handling of the constraining die is easy.
The ring-shaped product may be a bearing race.

  In the mold quenching method for a ring-shaped product according to the present invention, the constraint die used when pressing the constraint mold against the outer peripheral edge of both surfaces of the ring-shaped product is such that the surface pressed against the outer peripheral edge is separated from the ring-shaped product in the axial direction. Accordingly, the inclination is such that it approaches the inner peripheral edge side of the ring-shaped product, and the inclination continuously increases so as to increase or decrease as the distance from the ring-shaped product increases. In addition, the restraint mold used when the restraint mold is pressed against the inner peripheral edge of both surfaces of the ring-shaped product is such that the surface pressed against the inner peripheral edge approaches the outer peripheral edge side of the ring-shaped product as it moves away from the ring-shaped product in the axial direction. And the slope continuously increases so as to increase or decrease as the distance from the ring-shaped product increases.

  The mold quenching apparatus for a ring-shaped product according to the present invention includes a heating unit that heats the ring-shaped product to a quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both surfaces of the ring-shaped product heated by the heating unit. A constraining type that tilts toward the periphery so that it approaches the other peripheral side as it moves away from the ring-shaped product in the axial direction, and continuously increases so that the tilt increases or decreases as it moves away from the ring-shaped product in the axial direction. An upper mold that can hold the restraint mold so as to press against the peripheral edge of the upper side surface of the ring-shaped product with both surfaces facing up and down. A holding means, a lower mold holding means capable of holding the constraining die so as to be pressed against the peripheral edge of the lower side surface of the ring-shaped product, and a concentricity maintaining the centers of both the upper mold and the lower mold holding means concentrically Maintenance hand Characterized in that it has and.

  According to the mold quenching apparatus for a ring-shaped product of the present invention, the ring-shaped product is heated to the quenching temperature by the heating unit, and the heated ring-shaped product is cooled by the cooling unit among the outer peripheral edge and the inner peripheral edge on both sides. Inclined to one peripheral edge so as to approach the other peripheral side as it moves away from the ring-shaped product in the axial direction, and the inclination continuously increases so as to increase or decrease as it moves away from the ring-shaped product in the axial direction. Cool with the restraint mold pressed. When cooling the ring-shaped product in the cooling section, press the upper mold held by the upper mold holding means against the peripheral edge of the upper surface of the ring-shaped product with both sides facing up and down, The lower mold held by the lower mold holding means is pressed against the peripheral edge of the side surface. At this time, the centers of the upper and lower mold holding means are concentrically maintained by the concentricity maintaining means. By setting the cooling unit to the above configuration, it is possible to improve the work efficiency of the cooling process by the cooling unit.

  The mold quenching method of the ring-shaped product according to the present invention includes a heating process for heating the ring-shaped product to a quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both sides of the ring-shaped product. Cooling that cools in a state where the constraining die is pressed against the other peripheral side as it moves away, and the slope gradually increases as it moves away from the ring-shaped product or decreases continuously. It is possible to perform mold hardening with high accuracy such as roundness with less thermal deformation, and with one type of constraining type, and optimal deformation. Mold quenching can be performed at any contact surface angle that provides a prevention effect.

  The mold quenching apparatus for a ring-shaped product according to the present invention includes a heating unit that heats the ring-shaped product to a quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both surfaces of the ring-shaped product heated by the heating unit. A state in which a constraining die that is continuously inclined so as to become closer to the other peripheral side as it moves away from the ring-shaped product in the axial direction and continuously increases so that the inclination becomes larger as it moves away from the ring-shaped product in the axial direction A cooling part that cools the upper part of the ring-shaped product with both surfaces facing up and down. A lower mold holding means capable of holding the constraining mold so as to be pressed against the peripheral edge of the lower side surface of the ring-shaped article; and a concentricity maintaining means for maintaining the centers of both the upper mold and the lower mold holding means concentrically. Assumed Therefore, it is possible to perform mold hardening with high accuracy such as roundness with little thermal deformation while having a relatively simple configuration, and with one kind of restraint type, an arbitrary deformation prevention effect can be obtained. Mold quenching by contact surface angle can be performed.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the ring-shaped product quenching apparatus 1 includes a heating unit 2, a primary cooling unit 3, a secondary cooling unit 4, an air cooling unit 5, a cleaning unit 6, and a tempering unit 7.
The heating unit 2 heats the ring-shaped product to a predetermined quenching temperature (for example, 850 ° C.) using a heating furnace. This process is called a heating process.
The primary cooling unit 3 immerses the ring-shaped product heated to the quenching temperature in oil without being mold-constrained, and performs primary cooling to the vicinity of the martensitic transformation point (for example, 270 ° C.). The secondary cooling unit 4 immerses the primary-cooled ring-shaped product in oil in a state where it is placed in a constraining mold, and performs secondary cooling to a certain temperature (for example, 110 ° C.). The primary cooling and the secondary cooling are collectively referred to as a cooling process.
After completion of the cooling process, the ring-shaped product is naturally cooled to room temperature by the air cooling unit 5, cleaned by the cleaning unit 6, and tempered by the tempering unit 7.

  A feature of the mold quenching apparatus 1 is a mold quenching method in the secondary cooling unit 4. The mold quenching method means that one of the outer peripheral edge and the inner peripheral edge on both sides of the ring-shaped product is inclined so as to approach the other peripheral side as it is axially separated from the ring-shaped product, and the inclination is a ring. It cools in the state which pressed the constraining type | mold continuously changed so that it may become large or it may become small, so that it leaves | separates from an article in an axial direction. Here, “inclined” refers to a contact surface that contacts the periphery of the ring-shaped product, and does not refer to the shape of the entire constraining mold or the direction in which the constraining mold is pressed to press the ring-shaped product.

FIG. 2 shows the state of the ring-shaped product and the constraining die during mold quenching. In the figure, reference numeral 10 denotes a ring-shaped product, which is an outer ring of a bearing in this example. The upper mold 11 and the lower mold 12 that are restraining molds are pressed against the outer peripheral edges of the upper and lower end faces of the ring-shaped product 10. Each of the upper mold 11 and the lower mold 12 has an integral ring shape. The contact surfaces 11a and 12a of the constraining dies 11 and 12 with respect to the ring-shaped product are inclined with respect to the outer peripheral surface 10a of the ring-shaped product 10 so that the constraining dies 11 and 12 and the ring-shaped product 10 are in contact with each other. The contact surfaces 11a and 12a are inwardly convex, and the inclination increases as the distance from the ring-shaped product 10 increases in the axial direction. Like the constraining molds 11 and 12 shown in FIG. 3, the contact surfaces 11 a and 12 a may be concave inward, and the inclination may decrease as the distance from the ring-shaped product 10 increases in the axial direction.
2 and 3 both change the position of the contact surfaces 11a and 12a pressed against the ring-shaped product 10 to change the contact surface angle with respect to the ring-shaped product 10. For example, in the case of the constraining molds 11 and 12 in FIG. 2, as shown in FIG. 4, when the position from the outer periphery of the contact surfaces 11a and 12a is pressed against the ring-shaped product 10, it is larger than the contact surface angle θ1. When the position from the inner periphery of the contact surfaces 11a, 12a is pressed against the ring-shaped product 10, the contact surface angle θ2 is larger (θ1 <θ2). When the contact surface angle is large, the effect of increasing the roundness by preventing deformation in the radial direction is large. When the contact surface angle is small, the effect of suppressing the warpage and increasing the flatness tends to be large.

FIG. 5 shows an example in which the ring-shaped product is an inner ring of a bearing. In this case, the upper mold 11 and the lower mold 12 that are constraining molds are pressed against the inner peripheral edges of the upper and lower end faces of the ring-shaped product 10. Similarly to the above, the contact surfaces 11a and 12a of the constraining dies 11 and 12 are inclined with respect to the inner peripheral surface 10a of the ring-shaped product 10, and the constraining dies 11 and 12 and the ring-shaped product 10 are in line contact. . The contact surfaces 11a and 12a are inwardly convex, and the inclination increases as the distance from the ring-shaped product 10 increases in the axial direction. Similarly to the restraint molds 11 and 12 shown in FIG. 6, the contact surfaces 11 a and 12 a may be recessed inward, and the inclination may be reduced as the distance from the ring-shaped product 10 increases in the axial direction. .
Also in this case, the contact surface angle with respect to the ring-shaped product 10 is changed by changing the positions of the contact surfaces 11 a and 12 a pressed against the ring-shaped product 10.

  In order to press the constraining die against the ring-shaped product as described above, the die pressing mechanism shown in FIG. 7 is used. In the mold pressing mechanism 20, a plurality of lifting guides 22 are vertically provided on a lower mold mounting base 21, and an upper mold mounting base 23 is slidably provided along the lifting guide 22. Note that the upper ends of the elevating guides 22 are connected to each other by a connecting plate 24. The upper mold attachment base 23 is an upper mold holding means for attaching the upper mold 11 to the lower surface of the upper mold with a bolt or the like. The lower mold mounting base 21 has a lower mold 12 attached to the upper surface of the lower mold mounting base 21 with bolts or the like, and serves as a lower mold holding means. A lifting rod 26 is connected to the upper mold mounting base 23, and the upper mold mounting base 23 is moved up and down along the lifting guide 22 by moving the lifting rod 26 up and down by a lifting drive source (not shown). ing. The elevating guide 22 is a concentricity maintaining means for maintaining the centers of the upper and lower mold holding means 23 and 21 concentrically.

When the ring-shaped product 10 primarily cooled by the primary cooling unit 3 is supplied between the upper mold 11 and the lower mold 12, the upper mold 11 descends with respect to the lower mold 12. The ring-shaped product 10 is restrained. At this time, the upper mold 11 does not restrain the ring-shaped article 10 by a single lowering operation, but the upper mold 11 moves down several times (for example, three times) when it comes into contact with the ring-shaped article 10. ) After repeating, the ring-shaped product 10 is properly restrained. By performing such an operation, even if there is a slight positional relationship between the restraining molds 11 and 12 and the ring-shaped product 10 at the stage when the ring-shaped product 10 is supplied, the deviation is eliminated. The restraint molds 11 and 12 and the ring-shaped product 10 can be brought into a close contact state, that is, a so-called familiar state.
The ring-shaped product 10 constrained by the constraining dies 11 and 12 is immersed in oil in a state where the constraining dies 11 and 12 are pressed against the upper and lower outer peripheries of the ring-shaped product 10 by the weights of the upper mold 11 and the upper mold mounting base 23. It is immersed and cooled from about 260 ° C. to about 110 ° C.

  When mold quenching is performed by the above method, the restraint molds 11 and 12 that are inclined so as to approach the other peripheral side as they are separated from the ring-shaped product 10 in the axial direction are pressed against the periphery of the ring-shaped product 10. 10 is cooled in a state in which expansion in the axial direction and expansion in the radial direction are constrained, and thermal deformation in both directions is suppressed, and quenching is performed with high accuracy in terms of roundness and flatness. However, the deformation in both directions is not completely constrained, and a slight deformation is allowed, so that no residual distortion occurs. After the quenching is completed, the ring-shaped product 10 can be easily taken out from the restraint dies 11 and 12 simply by raising the upper die 11 and separating the upper and lower dies 11 and 12 from each other.

  In this mold quenching method, the peripheral edge of the ring-shaped product 10 is constrained by a line by the contact surfaces of the constraining dies 11, 12, so that any one of the contact surfaces 11a, 12a of the constraining dies 11, 12 is ring-shaped. It only has to be pressed against the periphery of the product. Since the position of the contact surface 11a, 12a pressed against the ring-shaped product 10 can be selected and the angle of the contact surface with respect to the ring-shaped product can be arbitrarily determined, one type of restraint type can provide an optimal deformation prevention effect. Mold quenching can be performed with any contact angle obtained.

  Further, since the constraining molds 11 and 12 and the ring-shaped product 10 are in contact with each other with a line, the constraining molds 11 and 12 are not easily affected by heat from the ring-shaped product 10, and the durability of the constraining molds 11 and 12 is good. The pressure for pressing the constraining dies 11 and 12 against the upper and lower outer peripheries of the ring-shaped product 10 only needs to be sufficient to maintain the constrained state, and does not require much pressure. For this reason, the dead weight of the upper mold | type 11 and the upper mold | type attachment base 23 can be utilized as said pressure, and the mechanism is simple.

In this embodiment, a ring-shaped constraining die is used so that the ring-shaped product and the constraining die are in contact with each other with a single continuous line. However, as shown in FIG. You may use the constraining type | mold with which the contact part became a several line or point.
In this embodiment, in the primary cooling and the secondary cooling, the ring-shaped product is immersed and cooled in the oil. However, in the primary cooling, as shown in FIG. In some cases, as shown in FIG. 10, cooling oil may be injected from the outer diameter side and the inner diameter side of the ring-shaped product 10 toward the ring-shaped product 10 to cool it. Further, the cooling oil may be injected only from either the outer diameter side or the inner diameter side.

It is a figure which shows the structure of the mold hardening apparatus of this invention. It is sectional drawing which shows the state which restrained the outer periphery of the ring-shaped article with the restraint type | mold by this invention. It is sectional drawing which shows the state which restrained the outer periphery of the ring-shaped goods with the different restraint type | mold by this invention. It is a figure explaining the difference in the magnitude | size of a contact surface angle by the difference in the contact surface position of the restraint type | mold pressed against a ring-shaped article. It is sectional drawing which shows the state which restrained the inner periphery of the ring-shaped goods with the restraint type by this invention. It is sectional drawing which shows the state which restrained the inner periphery of the ring-shaped goods with the different restraint type | mold by this invention. It is a figure which shows a mold pressing mechanism. It is a top view of a different restraint type. It is a figure which shows the cooling method of primary cooling. It is a figure which shows the cooling method of secondary cooling. It is sectional drawing which shows the conventional mold hardening method. It is a graph which shows the relationship between the temperature at the time of hardening, and product length. It is sectional drawing which shows the state which restrained the outer periphery of the ring-shaped article with the restraint type | mold by the prior | preceding technique of this invention. It is sectional drawing which shows the state which restrained the inner periphery of the ring-shaped article with the restraint type | mold by the former | preceding technique of this invention. It is a figure which shows the shape and dimension of a test piece. It is a graph which shows a test result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mold quenching apparatus 2 ... Heating part 3 ... Primary cooling part 4 ... Secondary cooling part 5 ... Air cooling part 6 ... Cleaning part 7 ... Tempering part 10 ... Ring-shaped article 11 ... Upper die (restraint type)
12 ... Lower mold (restraint type)
20 ... Mold pressing mechanism 21 ... Lower mold mounting base (lower mold holding means)
22 ... Elevating guide (concentricity maintaining means)
23 ... Upper die mounting base (upper die holding means)

Claims (10)

  The heating process for heating the ring-shaped product to the quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both sides of the ring-shaped product is inclined so as to approach the other peripheral side as it is axially separated from the ring-shaped product. And a cooling process of cooling the ring-shaped product in a state where the constrained mold is pressed so that its inclination is larger in the axial direction away from the ring-shaped product.   The heating process for heating the ring-shaped product to the quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both sides of the ring-shaped product is inclined so as to approach the other peripheral side as it is axially separated from the ring-shaped product. And a cooling process in which the cooling is performed in a state where the constraining mold is pressed so that the inclination thereof is separated from the ring-shaped product in the axial direction.   3. A die quenching method for a ring-shaped product according to claim 1, wherein the constraining die is an integral ring-shaped product.   4. The method for quenching a ring-shaped product according to claim 1, wherein the ring-shaped product is a bearing ring.   When the ring-shaped product heated to the quenching temperature is cooled and quenched, the restraint type is pressed against the outer peripheral edge of both sides of the ring-shaped product, and the surface pressed against the outer peripheral edge is pivoted from the ring-shaped product. A constraining type that inclines so as to approach the inner peripheral edge of the ring-shaped product as it moves away in the direction, and the inclination increases as it moves away from the ring-shaped product in the axial direction.   When the ring-shaped product heated to the quenching temperature is cooled and quenched, the restraint type is pressed against the outer peripheral edge of both sides of the ring-shaped product, and the surface pressed against the outer peripheral edge is pivoted from the ring-shaped product. A constraining type that inclines so that it approaches the inner peripheral edge of the ring-shaped product as it moves away from the direction, and the inclination decreases as it moves away from the ring-shaped product in the axial direction.   When the ring-shaped product heated to the quenching temperature is cooled and quenched, the restraint type is pressed against the inner peripheral edge of both sides of the ring-shaped product, and the surface pressed against the inner peripheral edge is pivoted from the ring-shaped product to the shaft. A constraining type that inclines so as to approach the outer peripheral edge of the ring-shaped product as it moves away in the direction, and the inclination increases as it moves away from the ring-shaped product in the axial direction.   When the ring-shaped product heated to the quenching temperature is cooled and quenched, the restraint type is pressed against the inner peripheral edge of both sides of the ring-shaped product, and the surface pressed against the inner peripheral edge is pivoted from the ring-shaped product to the shaft. A constraining type that inclines so that it approaches the outer peripheral edge of the ring-shaped product as it moves away in the direction, and the inclination becomes smaller as it moves away from the ring-shaped product in the axial direction. A heating unit that heats the ring-shaped product to the quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both surfaces of the ring-shaped product heated by the heating unit, the other as the distance from the ring-shaped product increases in the axial direction. A cooling part that cools in a state in which it is inclined so as to approach the peripheral side, and the restraint mold is pressed so that the inclination is increased in the axial direction from the ring-shaped product,
The cooling section includes an upper mold holding means capable of holding the constraining die so as to press against the peripheral edge of the upper side surface of the ring-shaped product with both surfaces facing upward and downward, and the peripheral edge of the lower side surface of the ring-shaped product. A mold quenching apparatus for a ring-shaped product, comprising: a lower mold holding means capable of holding the constraining mold so as to be pressed against the center; and a concentricity maintaining means for maintaining the centers of both the upper mold and the lower mold holding means concentrically. A heating unit that heats the ring-shaped product to the quenching temperature, and one of the outer peripheral edge and the inner peripheral edge on both surfaces of the ring-shaped product heated by the heating unit, the other as the distance from the ring-shaped product increases in the axial direction. A cooling part that cools in a state where it is tilted so as to approach the peripheral side, and the restraint mold is so small that the tilt is away from the ring-shaped product in the axial direction,
The cooling section includes an upper mold holding means capable of holding the constraining die so as to press against the peripheral edge of the upper side surface of the ring-shaped product with both surfaces facing upward and downward, and the peripheral edge of the lower side surface of the ring-shaped product. A mold quenching apparatus for a ring-shaped product, comprising: a lower mold holding means capable of holding the constraining mold so as to be pressed against the center; and a concentricity maintaining means for maintaining the centers of both the upper mold and the lower mold holding means concentrically.

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