JP2017106050A - Hardening method of stepped work, and cooling jacket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hardening method capable of improving a quality of a stepped work, and a cooling jacket suitably usable for the hardening method.SOLUTION: A hardening method of a stepped work includes: induction-heating the outer periphery of a stepped work 1A while moving a heating coil 2 to the adjacent direction between a thick portion 1a and a thin portion 1b of the stepped work 1A; spraying cooling liquid to the outer periphery of the stepped work 1A to cool while moving in the adjacent direction, a cooling jacket 3 capable of varying the jet direction of cooling liquid, subsequently to the heating coil 2; and changing the jet direction in the movement direction of the cooling jacket 3 between the case that a cooling portion is the thick portion 1a and the thin portion 1b, and the case the cooling portion is a step part 1c between the thick portion 1a and the thin portion 1b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stepped workpiece quenching method and a cooling jacket suitably used for the quenching method.

  The quenching method described in Patent Document 1 moves a heating coil that induction-heats a stepped shaft and a cooling jacket that blows cooling liquid onto the stepped shaft heated by the heating coil along the central axis of the stepped shaft. Then, each part of the stepped shaft is continuously heated and cooled for quenching.

  And in the hardening method described in patent document 1, in order to obtain uniform hardening hardness, it is a diameter which a coolant is easy to start in a diameter difference part (a corner part which is between a thick part and a thin part and becomes concave). In the difference portion, the injection amount of the coolant is decreased, and in the diameter difference portion where the coolant is difficult to be applied, the injection amount of the coolant is increased.

JP 2005-344159 A

  In the quenching method described in Patent Document 1, the injection amount of the cooling liquid is increased in the diameter difference portion where the cooling liquid is difficult to be applied. However, in the case where the steel material has a small alloy element having an effect of improving the hardenability. Further, there is a possibility that the cooling rate is insufficient at the diameter difference portion where the coolant is difficult to be applied, and the quenching hardness is uneven.

  This invention is made | formed in view of the situation mentioned above, It aims at providing the quenching method which can improve the quenching quality of a stepped workpiece | work, and the cooling jacket which can be used suitably for this quenching method. .

  A quenching method according to an aspect of the present invention is a quenching method for a stepped workpiece having a relatively thick portion and a relatively thin portion that are adjacent to each other, and the adjacent direction between the thick portion and the thin portion. The outer periphery of the stepped workpiece is induction-heated while the heating coil is moved relative to the heating coil, and the cooling jacket having a variable coolant injection direction is moved relative to the adjacent direction following the heating coil while moving the step. Cooling is performed by spraying a cooling liquid on the outer periphery of the attached workpiece, and the cooling liquid injection direction is determined by a step portion between the thick part and the thin part when the cooling part is the thick part and the thin part. In some cases, the cooling jacket is moved in the moving direction.

  A cooling jacket according to an aspect of the present invention is a cooling jacket that is formed in a cylindrical shape into which a workpiece can be inserted and that injects a cooling liquid toward the inserted workpiece, and includes a first annular shape on an inner peripheral surface of the cooling jacket. A group of first nozzle holes provided with an injection port in the region, and an injection port is provided in the second annular region of the inner peripheral surface of the cooling jacket, and the injection direction is the first nozzle hole in the axial direction of the cooling jacket. A second nozzle hole group different from the first nozzle hole group, one or more first liquid reservoir chambers connected to the first nozzle hole group, and the second nozzle hole group connected to the first liquid reservoir chamber; And one or more second liquid reservoir chambers capable of supplying coolant independently, wherein at least a part of the first annular region and at least a part of the second annular region are in the axial direction of the cooling jacket. Is superimposed.

  ADVANTAGE OF THE INVENTION According to this invention, the quenching method which can improve the quenching quality of a stepped workpiece | work, and the cooling jacket which can be used suitably for this quenching method can be provided.

It is a schematic diagram of an example of the hardening method of the stepped workpiece | work for demonstrating embodiment of this invention. It is a schematic diagram of the other example of the hardening method of the stepped workpiece | work for demonstrating embodiment of this invention. It is a schematic diagram of the other example of the hardening method of the stepped workpiece | work for demonstrating embodiment of this invention. It is a schematic diagram of the other example of the hardening method of the stepped workpiece | work for demonstrating embodiment of this invention. It is a perspective view of an example of a cooling jacket for explaining an embodiment of the present invention. It is a perspective view of the 1st module which comprises the cooling jacket of FIG. It is a perspective view of the 2nd module which comprises the cooling jacket of FIG. FIG. 6 is a schematic view of an example in which the cooling jacket of FIG. 5 is applied to the stepped work hardening method shown in FIG. 1. It is a perspective view of the modification of the cooling jacket of FIG. FIG. 10 is a schematic view of an example in which the cooling jacket of FIG. 9 is applied to the stepped work hardening method shown in FIG. 3. It is a perspective view of other examples of a cooling jacket for describing an embodiment of the present invention. It is the XII-XII sectional view taken on the line in FIG. It is the XIII-XIII sectional view taken on the line in FIG. It is a perspective view of other examples of a cooling jacket for describing an embodiment of the present invention. It is the XV-XV sectional view taken on the line in FIG. It is the XVI-XVI sectional view taken on the line in FIG.

  FIG. 1 is a schematic view of an example of a quenching method for explaining the present embodiment.

  The stepped workpiece 1A is a shaft member having a circular cross section, and has a relatively thick portion 1a and a relatively thin portion 1b that are adjacent to each other in the axial direction, and the thick portion 1a and the thin portion 1b. Is provided with a stepped portion 1c that gradually decreases in diameter from the thick portion 1a toward the thin portion 1b.

  In quenching of the stepped workpiece 1A, a heating coil 2 formed in an annular shape through which the stepped workpiece 1A can be inserted is used, and the heating coil 2 is relatively moved in the axial direction of the stepped workpiece 1A. Electric power is supplied, and the outer periphery of the stepped workpiece 1A is induction-heated over the entire length of the stepped workpiece 1A in the axial direction.

  Then, the cooling jacket 3 is formed in a cylindrical shape into which the stepped workpiece 1A can be inserted and the cooling liquid injection direction is variable. The cooling jacket 3 follows the heating coil 2 in the axial direction of the stepped workpiece 1A. While relatively moving, a coolant is sprayed on the outer periphery of the stepped workpiece 1A to cool the stepped workpiece 1A.

  In the heating and cooling of the stepped workpiece 1A, the stepped workpiece 1A may be rotated around the central axis of the stepped workpiece 1A from the viewpoint of suppressing heating unevenness and cooling unevenness.

  In the quenching of the stepped workpiece 1A as described above, the cooling liquid sprayed from the cooling jacket 3 has a cooling portion that is the thick portion 1a and the thin portion 1b of the stepped workpiece 1A and the step portion 1c. Then, it is changed in the moving direction of the cooling jacket 3.

  In the example shown in FIG. 1, the heating coil 2 and the cooling jacket 3 are moved from the thick part 1a side to the thin part 1b side of the stepped workpiece 1A. In this case, the cooling liquid injection direction when the cooling part is the stepped portion 1c is more rearward in the moving direction of the cooling jacket 3 than the injection direction when the cooling part is the thick part 1a and the thin part 1b. Tilt toward.

  In the illustrated example, when the thick part 1a and the thin part 1b of the stepped workpiece 1A are cooling parts, that is, when the cooling jacket 3 overlaps the thick part 1a and the thin part 1b, Is substantially perpendicular to the central axis of the stepped workpiece 1A, and coolant is sprayed substantially perpendicularly onto the surface of the thick portion 1a and the thin portion 1b that are substantially parallel to the central axis of the stepped workpiece 1A. Yes.

  On the other hand, when the cooling part is the stepped portion 1c of the stepped workpiece 1A, that is, when the cooling jacket 3 overlaps the stepped portion 1c, the injection direction of the coolant is substantially perpendicular to the central axis of the stepped workpiece 1A. It is inclined from one direction toward the thick part 1a corresponding to the rear side in the moving direction of the cooling jacket 3.

  The surface of the stepped portion 1c has a gradient with respect to the central axis of the stepped workpiece 1A, and faces the thin portion 1b that corresponds to the front side of the cooling jacket 3 in the moving direction. When the coolant is sprayed at an angle from the direction substantially perpendicular to the central axis of the stepped workpiece 1A toward the thick part 1a, and is sprayed substantially perpendicular to the central axis of the stepped workpiece 1A. As compared with the above, the coolant is sprayed from the front more on the surface of the stepped portion 1c.

  Thereby, the cooling rate of the surface of the stepped portion 1c can be increased to the same level as the cooling rate of the surface of the thick portion 1a or the thin portion 1b where the coolant is sprayed substantially vertically, and the quenching hardness of the stepped workpiece 1A. It is possible to suppress the occurrence of unevenness. Further, it is possible to prevent the coolant sprayed on the surface of the stepped portion 1c from flowing toward the thin portion 1b heated by the heating coil 2 on the moving direction front side of the cooling jacket 3 and lowering the temperature of the thin portion 1b. You can also.

  FIG. 2 shows a modification of the quenching method of FIG.

  In the example shown in FIG. 2, the heating coil 2 and the cooling jacket 3 are moved from the thin part 1b side to the thick part 1a side of the stepped workpiece 1A. In this case, the cooling liquid jetting direction when the cooling part is the stepped portion 1c is ahead of the moving direction of the cooling jacket 3 compared to the jetting direction when the cooling part is the thick part 1a and the thin part 1b. Tilt toward the thick part 1a.

  The surface of the stepped portion 1c has a gradient with respect to the central axis of the stepped workpiece 1A, and faces the thin portion 1b that corresponds to the rear side of the cooling jacket 3 in the moving direction. When the coolant is sprayed at an angle from the direction substantially perpendicular to the central axis of the stepped workpiece 1A toward the thick part 1a, and is sprayed substantially perpendicular to the central axis of the stepped workpiece 1A. As compared with the above, the coolant is sprayed from the front more on the surface of the stepped portion 1c.

  In parallel with the cooling of the surface of the stepped portion 1 c by the coolant sprayed from the cooling jacket 3, the thick portion 1 a is heated by the heating coil 2 on the moving direction front side of the cooling jacket 3. Therefore, the cooling liquid spray direction is changed with respect to the central axis of the stepped workpiece 1A before the flow rate of the cooling liquid sprayed from the cooling jacket 3 exceeds the step portion 1c as the cooling jacket 3 moves. It is preferable to switch substantially vertically. Thereby, it is possible to prevent the coolant from reaching the thick part 1a.

  The above quenching method can also be applied to a stepped workpiece having a plurality of step portions.

  In the stepped workpiece 1B shown in FIG. 3, a relatively thick part 1a, a relatively thin part 1b, and a relatively thick part 1c are arranged in this order in the axial direction, and the heating coil 2 and the cooling jacket 3 are The stepped workpiece 1B is moved from one thick part 1a side toward the other thick part 1c side.

  When the cooling part is the step 1d between the thick part 1a and the thin part 1b, the cooling jacket 3 is moved from the thick part 1a toward the thin part 1b, so that the cooling liquid injection direction is changed to the cooling portion. What is necessary is just to incline toward the thick site | part 1a side which is a movement direction of the cooling jacket 3 compared with the injection direction in case the site | part is the thick site | part 1a and the thin site | part 1b.

  Further, when the cooling portion is the step portion 1e between the thin portion 1b and the thick portion 1c, the cooling jacket 3 is moved from the thin portion 1b side to the thick portion 1c side, so that the cooling liquid injection direction is changed. As compared with the injection direction in the case where the cooling part is the thin part 1b and the thick part 1c, the cooling part 3 may be inclined toward the thick part 1c side corresponding to the moving direction front side.

  In the stepped workpiece 1C shown in FIG. 4, a relatively thin portion 1a, a relatively thick portion 1b, and a relatively thin portion 1c are arranged in this order in the axial direction, and the heating coil 2 and the cooling jacket 3 are The stepped work 1C is moved from the one thin part 1a side toward the other thin part 1c side.

  When the cooling part is the step portion 1d between the thin part 1a and the thick part 1b, the cooling jacket 3 is moved from the thin part 1a toward the thick part 1b. What is necessary is just to incline toward the thick site | part 1b side which is a moving direction front side of the cooling jacket 3 compared with the injection direction in case the site | part is the thin site | part 1a and the thick site | part 1b.

  Further, when the cooling part is the stepped portion 1e between the thick part 1b and the thin part 1c, the cooling jacket 3 is moved from the thick part 1b side to the thin part 1c side, so the injection direction of the coolant is changed. Compared to the injection direction when the cooling part is the thick part 1b and the thin part 1c, the cooling part 3 may be tilted toward the thick part 1b corresponding to the rear side in the moving direction of the cooling jacket 3.

  5 to 7 show an example of a cooling jacket for explaining an embodiment of the present invention.

  In the cooling jacket 30A, a plurality of first modules 31 and a plurality of second modules 32 formed in a fan shape are alternately arranged in the circumferential direction, and the adjacent first modules 31 and second modules 32 are joined to each other. By doing so, it is formed in a cylindrical shape as a whole.

  The first module 31 includes a main body block 34 formed in a fan shape and a lid member 35.

  A concave portion 40 is provided in the outer diameter portion of the main body block 34. The lid member 35 is joined to the opening of the recess 40, and the recess 40 closed by the lid member 35 is configured as a first liquid reservoir chamber 42. A coolant supply hole 35 a is formed in the lid member 35, and the coolant is supplied to the first liquid reservoir chamber 42 from a coolant supply unit (not shown) through the supply hole 35 a of the lid member 35.

  A plurality of first nozzle holes 45 for injecting a cooling liquid are provided in the inner diameter portion of the main body block 34. The injection holes 45a of the first nozzle holes 45 are provided on the inner peripheral surface of the main body block 34, and a plurality of injection holes 45a are arranged in the axial direction. They are arranged in six rows in the illustrated example. The first nozzle hole 45 is formed through the inner diameter portion of the main body block 34 and is connected to the recess 40 (first liquid reservoir chamber 42).

  The first nozzle hole 45 extends in parallel with the radial direction of the main body block 34, and the injection direction of the first nozzle hole 45 is substantially orthogonal to the central axis of the main body block 34.

  The second module 32 is also composed of a main body block 36 formed in a fan shape and a lid member 37.

  A concave portion 41 is provided in the outer diameter portion of the main body block 36. The lid member 37 is joined to the opening of the recess 41, and the recess 41 closed by the lid member 37 is configured as a second liquid reservoir chamber 43. A cooling liquid supply hole 37 a is formed in the lid member 37, and the cooling liquid is supplied to the second liquid reservoir chamber 43 from a cooling liquid supply unit (not shown) through the supply hole 37 a of the lid member 37.

  A plurality of second nozzle holes 46 for injecting the coolant are provided in the inner diameter portion of the main body block 36. The injection ports 46a of the second nozzle holes 46 are provided on the inner peripheral surface of the main body block 36, and a second injection port array L2 in which a plurality of injection ports 46a are arranged in the axial direction is spaced apart in the circumferential direction. They are arranged in six rows in the illustrated example. The second nozzle hole 46 is formed to penetrate the inner diameter portion of the main body block 36 and is connected to the recess 41 (second liquid reservoir chamber 43).

  The second nozzle hole 46 extends obliquely toward one axial direction of the main body block with respect to the radial direction of the main body block 36, and the injection direction of the second nozzle hole 46 is one axial direction of the main body block 36. And is oblique to the central axis of the main body block 36.

  On the inner peripheral surface of the cooling jacket 30A in which the first module 31 and the second module 32 are alternately arranged in the circumferential direction, and the adjacent first module 31 and second module 32 are joined to each other. A set of first injection port rows L1 having a plurality of rows (six rows in the illustrated example) as a set, a set of second injection port rows L2 having a plurality of rows (six rows in the illustrated example) as a set, Are alternately arranged in the circumferential direction.

  Then, on the inner peripheral surface of the cooling jacket 30A, the second annular region 30b including the injection ports 46a of all the second nozzle holes 46 is the first annular region including the injection ports 45a of all the first nozzle holes 45. 30a is biased to the opposite side to the one axial side of the cooling jacket 30A in which the injection direction of the second nozzle hole 46 is directed, and a part of the first annular region 30a and the second annular region 30b Some overlap. Note that the first annular region 30a and the second annular region 30b may coincide with each other.

  FIG. 8 shows an application example of the cooling jacket 30A to the quenching method for the stepped workpiece 1A shown in FIG.

  In the cooling jacket 30A, the second annular region 30b (see FIG. 5) on the inner peripheral surface provided with the injection port 46a of the second nozzle hole 46 is arranged on the front side in the moving direction, and the injection port 45a of the first nozzle hole 45 is provided. The first annular region 30a (see FIG. 5) provided with the is disposed on the rear side in the movement direction, and is moved from the thick portion 1a side to the thin portion 1b side of the stepped workpiece 1A. Further, the stepped workpiece 1A is rotated around the central axis.

  When the cooling part is the thick part 1a or the thin part 1b of the stepped workpiece 1A, the cooling liquid is supplied to the first liquid reservoir chamber 42 and the cooling liquid is ejected from the first nozzle hole 45. The coolant sprayed from the first nozzle hole 45 whose spray direction is substantially orthogonal to the central axis of the cooling jacket 30A is sprayed substantially perpendicularly onto the surface of the thick part 1a or the thin part 1b.

  When the cooling portion is the stepped portion 1c of the stepped workpiece 1A, the cooling liquid is supplied to the second liquid reservoir chamber 43, and the cooling liquid is ejected from the second nozzle hole 46. The coolant sprayed from the second nozzle hole 46 whose spraying direction is directed to the rear side in the moving direction of the cooling jacket 30A and obliquely intersects with the central axis of the cooling jacket 30A is directed to the front side in the moving direction of the cooling jacket 30A. The surface of the stepped portion 1c is sprayed from the front.

  In this example, a part of the first annular region 30a in which the injection port 45a of the first nozzle hole 45 is provided and a part of the second annular region 30b in which the injection port 46a of the second nozzle hole 46 is provided. Is overlapped, the distance D between the first annular region 30a and the heating coil 2 is shortened compared to the case where both regions are arranged adjacent to each other without overlapping. Thereby, in the thick site | part 1a and the thin site | part 1b of the stepped workpiece | work 1A cooled with the coolant injected from the 1st nozzle hole 45, time until it cools after being heated by the heating coil 2 is shortened. Can improve the quenching quality.

  FIG. 9 shows a modification of the cooling jacket 30A.

  The cooling jacket 30B has a plurality of third nozzle holes 47 whose injection direction is directed to one side in the axial direction opposite to the second nozzle holes 46 and obliquely intersects with the central axis of the cooling jacket 30B, and these third nozzle holes. A third module 33 having a third liquid reservoir chamber 44 connected to 47 is added, the first module 31, the second module 32, and the third module 33 are sequentially arranged in the circumferential direction, and adjacent modules are connected to each other. It is constructed by joining. At least a part of the third annular region 30c including the injection ports 47a of all the third nozzle holes 47 on the inner peripheral surface of the cooling jacket 30B is the first including the injection ports 45a of all the first nozzle holes 45. It overlaps at least part of the annular region 30a.

  The cooling jacket 30B configured as described above has a plurality of stepped portions, such as the stepped workpiece 1B shown in FIG. 3 and the stepped workpiece 1C shown in FIG. It can be used for quenching a stepped workpiece directed in different directions on one side and the other side.

  FIG. 10 shows an application example of the cooling jacket 30B to the quenching method of the stepped workpiece 1B shown in FIG.

  In the example shown in FIG. 10, the cooling jacket 30 </ b> B has the second annular region 30 b (see FIG. 9) on the inner peripheral surface of the cooling jacket 40 </ b> B provided with the injection port 46 a of the second nozzle hole 46 disposed on the front side in the movement direction. Then, the third annular region 30c (see FIG. 9) on the inner peripheral surface of the cooling jacket 30B provided with the injection port 47a of the third nozzle hole 47 is arranged on the rear side in the movement direction, and one of the stepped workpieces 1B is disposed. It moves from the thick part 1a side toward the other thick part 1c side.

  When the cooling portion is the step portion 1d between the thick portion 1a and the thin portion 1b, the cooling liquid is supplied to the second liquid reservoir chamber 43, and the cooling liquid is ejected from the second nozzle hole 46. The coolant injected from the second nozzle hole 46 whose injection direction is directed to the lower side in the axial direction of the cooling jacket 30B, that is, the rear side in the moving direction of the cooling jacket 30B, and obliquely intersects the central axis of the cooling jacket 30B. The cooling jacket 30B is sprayed from the front side to the surface of the stepped portion 1d facing the moving direction ahead.

  When the cooling portion is the step portion 1e between the thin portion 1b and the thick portion 1c, the cooling liquid is supplied to the third liquid reservoir chamber 44, and the cooling liquid is ejected from the third nozzle hole 47. The coolant injected from the third nozzle hole 47 whose injection direction is directed to the upper side in the axial direction of the cooling jacket 30B, that is, the moving direction of the cooling jacket 30B and obliquely intersects with the central axis of the cooling jacket 30B. The cooling jacket 30B is sprayed from the front surface to the surface of the stepped portion 1e facing the moving direction rear side.

  11 to 13 show another example of the cooling jacket for explaining the embodiment of the present invention.

  The cooling jacket 50 is composed of a single member formed in a cylindrical shape.

  A plurality of first nozzle holes 51 whose injection direction is substantially orthogonal to the central axis of the cooling jacket 50 and a plurality of second nozzle holes whose injection direction is oblique to the central axis of the cooling jacket 50 are formed in the inner diameter portion of the cooling jacket 50. 52 are provided.

  Then, on the inner peripheral surface of the cooling jacket 50, the first injection port array L1 in which the injection ports 51a of the first nozzle holes 51 are arranged in the axial direction and the injection ports 52a of the second nozzle holes 52 are arranged in the axial direction. Are arranged alternately in the circumferential direction in every other row.

  On the inner peripheral surface of the cooling jacket 50, the second annular region 50b including the injection ports 52a of all the second nozzle holes 52 is changed to the first annular region 50a including the injection ports 51a of all the first nozzle holes 51. On the other hand, the cooling jacket 50 to which the injection direction of the second nozzle hole 52 is directed is biased to the opposite side to the one axial side, and part of the first annular region 50a and part of the second annular region 50b. And are superimposed. Note that the first annular region 50a and the second annular region 50b may coincide with each other.

  Further, a first liquid reservoir chamber 54 to which the first nozzle hole 51 is connected and a second liquid reservoir chamber 55 to which the second nozzle hole 52 is connected are provided on the outer diameter portion of the cooling jacket 50. . The first liquid reservoir chamber 54 includes a main chamber 60 and a plurality of sub chambers 61 connected to the main chamber 60, and the second liquid reservoir chamber 55 is also connected to the main chamber 62 and the main chamber 62. A plurality of sub chambers 63 are connected.

  The main chamber 60 of the first liquid reservoir chamber 54 and the main chamber 62 of the second liquid reservoir chamber 55 are each formed in an annular shape, and are provided side by side in the axial direction of the cooling jacket 50. One or more coolant supply holes 60a are formed in the main chamber 60 of the first liquid reservoir chamber 54, and the coolant is supplied from a coolant supply unit (not shown) through the supply holes 60a. One or more coolant supply holes 62a are also formed in the main chamber 62 of the second liquid reservoir chamber 55, and the main chamber 60 of the first liquid reservoir chamber 54 passes through a supply hole 62a from a coolant supply unit (not shown). Is independently supplied with a coolant.

  The sub chamber 61 of the first liquid reservoir chamber 54 is provided for each first injection port array L1, extends along the first injection port array L1, and a plurality of first nozzles constituting the first injection port array L1. The holes 51 are connected to each other. The coolant supplied to the main chamber 60 of the first liquid reservoir chamber 54 flows into each of the sub chambers 61 and is ejected from the first nozzle hole 51 through the sub chamber 61.

  The sub chamber 63 of the second liquid reservoir chamber 55 is also provided for each second injection port array L2, and extends along the second injection port array L2, and includes a plurality of second chambers constituting the second injection port array L2. Nozzle holes 52 are connected to each other. The coolant supplied to the main chamber 62 of the second liquid reservoir chamber 55 flows into each of the sub chambers 63 and is ejected from the second nozzle hole 52 through the sub chamber 63.

  Here, the tip portion 52 b connected to the injection port 52 a of the second nozzle hole 52 whose injection direction obliquely intersects with the central axis of the cooling jacket 50 is on the lower side in the axial direction of the cooling jacket 50 with respect to the radial direction of the cooling jacket 50. In contrast, the connecting portion 52c of the second nozzle hole 52 and the sub chamber 63 is parallel to the radial direction of the cooling jacket 50 with a bent portion 52d interposed between the tip portion 52b and the connecting portion 52c. The connection portion 52c is substantially perpendicular to the inner surface of the sub chamber 63 provided with the opening of the connection portion 52c. Since the connecting portion 52c is substantially perpendicular to the inner surface of the sub chamber 63, the disturbance of the coolant injected from the second nozzle hole 52 is suppressed.

  When the connection portion of the second nozzle hole 52 with the sub chamber 63 is inclined with respect to the inner surface of the sub chamber 63, the flow of the coolant flowing into the connection portion becomes non-uniform, and cooling in the vicinity of the inner peripheral surface of the connection portion A distribution occurs in the flow rate of the liquid, and a relatively large pressure distribution is generated in the coolant flowing through the connecting portion by the flow rate distribution. Then, it is considered that cavitation is generated by this pressure distribution, and the flow of the coolant injected from the second nozzle hole 52 is disturbed.

  Note that the connection portion of the first nozzle hole 51 extending in parallel with the radial direction of the cooling jacket 50 and the sub chamber 61 is also substantially perpendicular to the inner surface of the sub chamber 61 provided with the opening of the connection portion. The disturbance of the coolant injected from the first nozzle hole 61 is suppressed.

  It has a first liquid reservoir chamber 54 and a second liquid reservoir chamber 55 inside, a plurality of nozzle holes are formed, and in particular, a plurality of second nozzle holes 52 provided with bent portions are formed. The cooling jacket 50 can be composed of a three-dimensional layered object manufactured using a so-called three-dimensional printer, and the three-dimensional shape of the cooling jacket 50 is a number of faults perpendicular to any one direction (for example, the axial direction). It is prepared by forming a molding material such as resin or metal powder into a cross-sectional shape of each layer and stacking them one by one.

  When the cooling jacket 50 is applied to the quenching method for the stepped workpiece 1A shown in FIG. 1 in the same manner as the cooling jacket 30A described above, the cooling portion is the thick portion 1a or the thin portion 1b of the stepped workpiece 1A. The coolant is ejected from the first nozzle hole 51, and the coolant is ejected from the second nozzle hole 52 when the cooling portion is the step portion 1c.

  According to the cooling jacket 50, similarly to the cooling jacket 30A described above, a part of the first annular region 50a provided with the injection port 51a of the first nozzle hole 51 and the injection port 52a of the second nozzle hole 52 are provided. The distance between the first annular region 50a and the heating coil 2 is compared with a case where the two annular regions 50b are overlapped with each other and compared with the case where the two regions are arranged adjacent to each other without overlapping. Is shortened. Thereby, in the thick site | part 1a and the thin site | part 1b of the stepped workpiece | work 1A cooled with the coolant injected from the 1st nozzle hole 51, time until it is cooled after being heated by the heating coil 2 is shortened. Can improve the quenching quality.

  Further, according to the cooling jacket 50, the first injection port array L1 in which the injection ports 51a of the first nozzle holes 51 are arranged in the axial direction and the second injection port 52a of the second nozzle holes 52 are arranged in the axial direction. The injection port rows L2 are alternately arranged every other row in the overlapping region of the first annular region 50a and the second annular region 50b, and a set of first injection port rows L1 having a plurality of rows as one set, The first nozzle hole 51 and the second nozzle hole 52 are each of the cooling jacket 50 as compared to the above-described cooling jacket 30A in which a set of the second injection port rows L2 having a plurality of rows as a set is alternately arranged. It is uniformly distributed in the circumferential direction. Thereby, it can suppress that a cooling nonuniformity arises in the circumferential direction of 1 A of stepped workpiece | work, and can improve quenching quality.

  Although not shown in the drawing, a plurality of third nozzle holes whose injection direction is directed to one side in the axial direction opposite to the second nozzle holes 52 and obliquely intersect with the central axis of the cooling jacket 50, and the third nozzle holes. The third liquid reservoir chamber to which the nozzle holes are connected is added to the cooling jacket 50, the first injection port array L1 in which the injection ports 51a of the first nozzle holes 51 are arranged in the axial direction, and the injection ports of the second nozzle holes 52. The second injection port array L2 in which 52a is arranged in the axial direction and the third injection port array in which the injection ports of the third nozzle holes are arranged in the axial direction may be repeatedly arranged in order. The cooling jacket configured as described above has a plurality of stepped portions such as the stepped workpiece 1B shown in FIG. 3 and the stepped workpiece 1C shown in FIG. 4, and the surface of these stepped portions is in the axial direction. It can be suitably used for quenching stepped workpieces directed in different directions on one side and the other side.

  14 to 16 show another example of the cooling jacket for explaining the embodiment of the present invention.

  The cooling jacket 70 is composed of a single member formed in a cylindrical shape, similar to the cooling jacket 50 described above.

  A plurality of first nozzle holes 71 whose injection direction is substantially orthogonal to the central axis of the cooling jacket 70 and a plurality of second nozzle holes whose injection direction is oblique to the central axis of the cooling jacket 70 are formed in the inner diameter portion of the cooling jacket 70. 72 is provided.

  And on the inner peripheral surface of the cooling jacket 70, there is an injection port array L in which the injection ports 71a of the first nozzle holes 71 and the injection ports 72a of the second nozzle holes 72 are alternately arranged in the axial direction in the circumferential direction. A plurality are arranged at intervals.

  Among the plurality of first nozzle holes 71 and the plurality of second nozzle holes 72 constituting one injection port array L, the second nozzle hole 72 is on the surface S1 including the central axis of the cooling jacket 70 and the injection port array L. The first nozzle hole 71 is formed on the surface S2 between the surfaces S1 and S1 including the adjacent injection port arrays L, except for the tip portion continuous to the injection port 71a. In addition, the 1st nozzle hole 71 may be formed on the surface S1, and the 2nd nozzle hole 72 may be formed on the surface S2 except the front-end | tip part connected to the injection port 72a.

  On the inner peripheral surface of the cooling jacket 70, the second annular region 70 b including the injection ports 72 a of all the second nozzle holes 72 is changed to the first annular region 70 a including the injection ports 71 a of all the first nozzle holes 71. In contrast, the cooling jacket 70 to which the injection direction of the second nozzle hole 72 is directed is biased to the opposite side to the one axial side, and a part of the first annular region 70a and a part of the second annular region 70b. And are superimposed. Note that the first annular region 70a and the second annular region 70b may coincide with each other.

  Further, a first liquid reservoir chamber 74 to which the first nozzle hole 71 is connected and a second liquid reservoir chamber 75 to which the second nozzle hole 72 is connected are provided on the outer diameter portion of the cooling jacket 70. . The first liquid reservoir chamber 74 and the second liquid reservoir chamber 75 are each formed in an annular shape, and are provided side by side in the axial direction of the cooling jacket 70. The first liquid reservoir 74 and the second liquid reservoir 75 are supplied with a coolant independently from a coolant supply unit (not shown).

  When the cooling jacket 70 is applied to the quenching method for the stepped workpiece 1A shown in FIG. 1 in the same manner as the cooling jacket 30A and the cooling jacket 50 described above, the cooling portion is a thick portion 1a or a thin portion of the stepped workpiece 1A. In the case of 1b, the cooling liquid is injected from the first nozzle hole 71, and in the case where the cooling portion is the step portion 1c, the cooling liquid is injected from the second nozzle hole 72.

  Also in this example, the connection portion between the first nozzle hole 71 and the first liquid reservoir chamber 74 is substantially perpendicular to the inner surface of the first liquid reservoir chamber 74 provided with the opening of the connection portion. Disturbance of the coolant injected from the one nozzle hole 71 is suppressed. Similarly, the connection portion of the second nozzle hole 72 with the second liquid reservoir chamber 75 is also substantially perpendicular to the inner surface of the second liquid reservoir chamber 75 provided with the opening of the connection portion. Disturbance of the coolant injected from the nozzle hole 72 is suppressed.

  According to the cooling jacket 70, as in the cooling jacket 30 </ b> A and the cooling jacket 50 described above, a part of the first annular region 70 a provided with the injection ports 71 a of the first nozzle holes 71 and the injection of the second nozzle holes 72. The first annular region 70a and the heating coil 2 can be compared with the case where the two annular regions 70b provided with the mouth 72a are overlapped with each other, compared to the case where the two regions are arranged adjacent to each other without overlapping. The distance between is reduced. Thereby, in the thick site | part 1a and the thin site | part 1b of the stepped workpiece | work 1A cooled by the coolant injected from the 1st nozzle hole 71, time until it is cooled after being heated by the heating coil 2 is shortened. Can improve the quenching quality.

  Furthermore, according to the cooling jacket 70, the injection port 71a of the first nozzle hole 71 and the injection port 72a of the second nozzle hole 72 are axially arranged in the overlapping region of the first annular region 70a and the second annular region 70b. A plurality of injection port arrays L arranged alternately are arranged at intervals in the circumferential direction, and a first injection port array L1 in which the injection ports 51a of the first nozzle holes 51 are aligned in the axial direction, and a second nozzle The first nozzle hole 71 and the second nozzle hole are compared with the cooling jacket 50 described above in which the second injection port arrays L2 in which the injection ports 52a of the holes 52 are arranged in the axial direction are alternately arranged in the circumferential direction. 72 are arranged uniformly and densely distributed in the circumferential direction of the cooling jacket 70. Thereby, it can suppress further that a cooling nonuniformity arises in the circumferential direction of 1 A of stepped workpiece | work, and can improve quenching quality.

  In addition, although illustration is omitted, a plurality of third nozzle holes whose injection direction is directed to one side in the axial direction opposite to the second nozzle holes 72 and oblique to the central axis of the cooling jacket 70, and the third of these third nozzle holes. The third liquid reservoir chamber to which the nozzle hole is connected is added to the cooling jacket 70, and the injection port 71a of the first nozzle hole 71, the injection port 72a of the second nozzle hole 72, and the injection port of the third nozzle hole are sequentially arranged. You may make it arrange | position the injection nozzle row | line | column arrange | positioned repeatedly in multiple rows at intervals in the circumferential direction. The cooling jacket configured as described above has a plurality of stepped portions such as the stepped workpiece 1B shown in FIG. 3 and the stepped workpiece 1C shown in FIG. 4, and the surface of these stepped portions is in the axial direction. It can be suitably used for quenching stepped workpieces directed in different directions on one side and the other side.

1A Stepped Work 1a Thick Part 1b Thin Part 1c Step Part 2 Heating Coil 3 Cooling Jacket 30A Cooling Jacket 30a First Annular Area 30b Second Annular Area 30c Third Annular Area 42 First Liquid Reserving Chamber 43 Second Liquid Reserving Chamber 44 Third liquid reservoir 45 First nozzle hole 45a Injecting port 46 Second nozzle hole 46a Injecting port 47 Third nozzle hole 47a Injecting port 50 Cooling jacket 50a First annular region 50b Second annular region 51 First nozzle hole 51a Injecting port 52 Second nozzle hole 52a Injecting port 54 First liquid reservoir chamber 55 Second liquid reservoir chamber 70 Cooling jacket 70a First annular region 70b Second annular region 71 First nozzle hole 71a Injecting port 72 Second nozzle hole 72a Injecting port 74 First liquid reservoir chamber 75 Second liquid reservoir chamber L outlet row L1 first outlet row L2 second outlet row

Claims (9)

A stepped work hardening method having a relatively thick part and a relatively thin part adjacent to each other,
Inductively heating the outer periphery of the stepped workpiece while relatively moving the heating coil in the adjacent direction of the thick part and the thin part,
Cooling by spraying the cooling liquid on the outer periphery of the stepped workpiece while moving the cooling jacket having a variable injection direction of the cooling liquid relative to the adjacent direction following the heating coil,
The cooling liquid spraying direction changes in the moving direction of the cooling jacket between the case where the cooling part is the thick part and the thin part and the case where the cooling part is a step portion between the thick part and the thin part. How to quench stepped workpieces. A method for quenching a stepped workpiece according to claim 1,
In the case where the cooling jacket is moved from the thick part side toward the thin part side, the cooling liquid injection direction when the cooling part is the stepped portion, the cooling part is the thick part and the thin part A stepped work hardening method in which the cooling jacket is inclined toward the rear side in the moving direction of the cooling jacket as compared with the injection direction in the case of A method for quenching a stepped workpiece according to claim 1,
In the case where the cooling jacket is moved from the narrow part side toward the thick part side, the cooling liquid injection direction in the case where the cooling part is the stepped portion, the cooling part is the thick part and the thin part A stepped work hardening method in which the cooling jacket is inclined toward the moving direction ahead of the injection direction in the case of A cooling jacket that is formed in a cylindrical shape into which a workpiece can be inserted and that injects a coolant toward the workpiece to be inserted,
A group of first nozzle holes provided with injection ports in a first annular region of the inner peripheral surface of the cooling jacket;
A group of second nozzle holes provided with an injection port in a second annular region of the inner peripheral surface of the cooling jacket, the injection direction being different from the first nozzle hole in the axial direction of the cooling jacket;
One or more first liquid reservoir chambers connected to the first group of nozzle holes;
One or more second liquid reservoir chambers connected to the second nozzle hole group and capable of supplying a cooling liquid independently of the first liquid reservoir chamber;
With
A cooling jacket in which at least a part of the first annular region and at least a part of the second annular region overlap each other in the axial direction of the cooling jacket. The cooling jacket according to claim 4,
In the overlapping region of the first annular region and the second annular region, the first injection port array in which the injection ports of the first nozzle holes are arranged in the axial direction of the cooling jacket is spaced in the circumferential direction of the cooling jacket. Multiple
A cooling jacket in which second injection port arrays in which the injection ports of the second nozzle holes are arranged in the axial direction of the cooling jacket are respectively disposed between the adjacent first injection port arrays. The cooling jacket according to claim 4,
In the overlapping region of the first annular region and the second annular region, the injection ports of the first nozzle holes are arranged in the axial direction of the cooling jacket, and between the injection ports of the adjacent first nozzle holes, The cooling jacket in which the ejection port arrays in which the ejection ports of the second nozzle holes are respectively disposed are spaced apart in the circumferential direction. The cooling jacket according to any one of claims 4 to 6,
The connecting portion of the first nozzle hole with the first liquid reservoir chamber is formed to extend perpendicularly to the inner surface of the first liquid reservoir chamber provided with an opening of the connecting portion,
A cooling jacket in which a connection portion between the second nozzle hole and the second liquid reservoir chamber extends perpendicularly to an inner surface of the second liquid reservoir chamber provided with an opening of the connection portion. A cooling jacket according to any one of claims 4 to 7,
A group of third nozzle holes provided with an injection port in a third annular region of the inner peripheral surface of the cooling jacket, the injection direction being different from the first nozzle hole and the second nozzle hole in the axial direction of the cooling jacket;
One or more third liquid reservoir chambers connected to the third nozzle hole group and capable of supplying a cooling liquid independently of the first liquid reservoir chamber and the second liquid reservoir chamber;
With
A cooling jacket in which at least a part of the first annular region and at least a part of the third annular region overlap in the axial direction of the cooling jacket. A cooling jacket according to any one of claims 4 to 8,
A cooling jacket made up of one member of a three-dimensional layered object.

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