JP2014218710A - Hardening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hardening device capable of correcting change of rugged shape dimension when a workpiece on which the rugged shape is formed, especially, correcting change of diameters of a recessed part and a salient part.SOLUTION: A hardening device comprises: a first mold part 10 for holding a heated workpiece W; a reference wall face facing to a step difference face forming the rugged shape formed on the surface of the workpiece W held by the first mold part 10; projection parts (151, 152) projecting toward a top face forming the rugged shape formed on the surface of the workpiece W held by the first mold part 10, and having inclination faces (151b, 152b) inclined to the reference wall face so as to come close to the reference wall face as going to a base end side from a tip end side; and a second mold part 20 for applying pressure to the workpiece W held by the first mold part 10 to a direction parallel to the reference wall face.

Description

  The present invention relates to a quenching apparatus for a metal molded product, and more particularly to a quenching apparatus for quenching by cooling while restraining a metal workpiece on which an uneven shape is formed.

  When quenching a metal workpiece, the workpiece may be deformed by expansion due to heating, contraction due to cooling, or transformation expansion. A quenching apparatus configured to prevent such deformation is disclosed in Patent Document 1. The quenching apparatus shown in Patent Document 1 is configured to cool a heated workpiece while restraining it in a mold. By restraining the work during cooling, the deformation of the work is corrected.

JP-A-2005-171276

(Problems to be solved by the invention)
Of the deformation of the workpiece that occurs during quenching, deformation such as the bending angle of the bent portion can be corrected by restraining the workpiece with a conventional mold. However, when the size of the uneven shape formed on the workpiece is changed by heating, the changed size cannot be restored to the original size by restraining the workpiece with a conventional mold. For example, when the recessed part formed in the workpiece expands due to heating during quenching, the expanded recessed part cannot be returned to the original state even if the workpiece is restrained by a mold. On the other hand, when the concave portion of the work is shrunk by heating during quenching, it may happen that the work cannot be put into a mold that restrains the work. That is, according to the conventional quenching apparatus, deformation of the shape of the workpiece can be corrected, but it cannot be corrected until a change in the size of the workpiece, particularly the size of the uneven shape formed on the workpiece. Such a concavo-convex shape generally has a portion in which the dimension does not change due to a clamping load from the mold. For example, when the workpiece is clamped by the vertical movement of the mold, the diameter of the concave portion that opens in the vertical direction, the distance between the two inner wall surfaces that form the concave portion, and the like are not changed by the clamping load from the vertical direction. Therefore, the dimension of such a part cannot be corrected by the conventional method.

  It is an object of the present invention to provide a quenching apparatus that can correct a change in the size of a concavo-convex shape, in particular, a change in the diameter of a concave portion or a diameter of a convex portion when quenching a workpiece having a concave and convex shape. .

(Means for solving the problem)
The present invention is a quenching apparatus for quenching a workpiece by cooling while restraining a workpiece having an uneven surface formed on one surface and the other surface facing a direction different from the one surface and the one surface, A first mold part that holds the heated workpiece, and at least a part of the step surface that is formed in the first mold part and that forms a concavo-convex shape formed on one surface of the workpiece that is held by the first mold part. Projecting toward the top surface constituting the concave and convex shape formed on the one surface of the workpiece formed on the first mold part and held on the first mold part, and on the reference wall from the tip side A protrusion having an inclined surface that is inclined with respect to the reference wall so as to approach the reference wall as it goes toward the end side, and a workpiece held by the first mold portion so that the protrusion bites into the top surface from the tip. Pressurization in the direction parallel to the wall That includes a second mold part, and to provide a quenching apparatus.

  Here, the “concave / convex shape” means a shape in which one or more concave portions or convex portions are formed on one surface of the workpiece. Further, the “step surface” means a wall surface along the depth direction of the concave portion or the height direction of the convex portion. The “top surface” means an opening surface of a concave portion connected to an end portion of a stepped surface or a tip surface of the convex portion.

  According to the present invention, when the heated work is held by the first mold part, the step surface forming the uneven shape formed on one surface of the work faces the reference wall surface of the first mold part. In addition, the protrusion faces the top surface that forms the uneven shape formed on one surface of the workpiece. In this state, when the work is pressed by the second mold part, the protrusion of the first mold part bites into the top surface formed on one surface of the work from its tip. Since the protruding portion is formed with an inclined surface that is inclined with respect to the reference wall surface so as to approach the reference wall surface from the distal end side toward the proximal end side, the protruding portion is It flows so that the pushed part approaches the reference wall surface along the inclined surface. The dimension of the uneven shape of the workpiece can be changed by such material flow. In addition, since the position of the uneven surface of the workpiece is determined when the fluidized material comes into close contact with the reference wall surface, by setting the position of the reference wall surface to a desired position, the uneven surface dimensions are set to the target dimensions. It can be corrected.

  And after correcting the uneven | corrugated shape dimension of a workpiece | work to the target dimension, quenching of a workpiece | work is completed by quenching a workpiece | work with cooling water, for example, restraining a workpiece | work with a 1st type | mold part and a 2nd type | mold part. The This increases the strength of the workpiece. As described above, according to the present invention, it is possible to provide a quenching apparatus capable of correcting a change in the size of the concavo-convex shape when quenching the workpiece having the concavo-convex shape.

  The reference wall surface may include a first reference wall surface and a second reference wall surface formed so as to face the first step surface and the second step surface, which are two step surfaces constituting the uneven shape of the workpiece. . And the said protrusion part protrudes toward the top surface formed continuously from the 1st level | step difference surface among the top surfaces which comprise the uneven | corrugated shape of a workpiece | work, and becomes a 1st reference | standard wall surface as it goes to a base end from a front-end | tip. A first protrusion having a first inclined surface inclined with respect to the first reference wall surface so as to approach, and a top surface formed continuously from the second step surface among the top surfaces constituting the uneven shape of the workpiece. And a second protrusion having a second inclined surface inclined with respect to the second reference wall surface so as to approach the second reference wall surface from the distal end toward the proximal end.

  According to this, when the work held by the first mold part is pressurized by the second mold part, the first step surface is formed by the material flow caused by the first protrusions biting into the top surface of the work. The second step surface is brought into close contact with the second reference wall surface by the material flow caused by the second protrusions biting into the top surface of the workpiece while being in close contact with the first reference wall surface. For this reason, the distance between the first step surface and the second step surface is corrected to the distance between the first reference wall surface and the second reference wall surface. Therefore, by setting the distance between the first reference wall surface and the second reference wall surface to a normal distance between the first step surface and the second step surface, the workpiece can be processed using the quenching apparatus of the present invention. In cooling, the distance between the first step surface and the second step surface, for example, the diameter of the concave portion and the diameter of the convex portion can be accurately corrected.

  In this case, when the work is pressed by the second mold part, the first projecting part bites into the top surface of the work so that the first step surface of the work comes into close contact with the first reference wall surface. The second projecting portion is provided on the top surface of the workpiece when the workpiece is pressurized by the second mold portion so that the material flow of the workpiece occurs. It is good to be provided in the vicinity of the second reference wall surface to such an extent that the material flow of the workpiece occurs so that the second step surface of the workpiece is brought into close contact with the second reference wall surface by the protrusion.

  In addition, the first mold part has a support surface that contacts the top surface of the work and supports the top surface when the work held by the first mold part is pressurized to the second mold part. Good. And it is good for the projection part to be formed in the support surface. In this case, the material flow of the workpiece occurs such that the stepped surface of the workpiece comes into close contact with the reference wall surface due to the projection biting into the top surface of the workpiece when the workpiece is pressed by the second mold portion. It is good to be provided in the vicinity of the reference wall surface.

It is a perspective view of the workpiece | work hardened by the hardening apparatus which concerns on this embodiment. It is the schematic front view which looked at the surface of the workpiece | work W from the rotating shaft direction. It is AA sectional drawing of FIG. It is a schematic sectional drawing of a hardening apparatus. It is a figure which shows a 1st type | mold part, FIG. 5 (a) is a perspective view, FIG.5 (b) is a front view showing a restraint surface. It is a figure which shows a 2nd type | mold part, FIG. 6 (a) is a perspective view, FIG.6 (b) is a front view showing a restraint surface. It is a schematic front view which shows simply the main structures of a 1st type | mold part. It is a BB schematic sectional drawing of FIG. It is a partial section schematic diagram showing the holding state of work W by the 1st type part. It is sectional drawing which shows the state which pressurized the workpiece | work W mounted in the 1st type | mold part with the 2nd type | mold part. When the workpiece W is quenched without being constrained, when the workpiece W is clamped and quenched with the upper die and the lower die, and when the workpiece is quenched using the quenching apparatus 1 of the present embodiment, the gap G It is a graph which shows the variation of. It is sectional drawing of the 1st type | mold part which concerns on the modification of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a workpiece (heat treatment object) to be quenched by the quenching apparatus according to the present embodiment. The workpiece shown in the present embodiment is a rotating member used in a vehicle seat recliner mechanism. The workpiece W has a disk shape having a front surface (one surface) W1 and a back surface (other surface) W2 facing away from the surface W1, and is configured to be able to rotate when assembled to a vehicle seat. Is done. Further, on the surface W1 of the workpiece W, a circular bottom wall W4 provided with a through hole W3 in the center, a ring-shaped outer peripheral wall W5 erected from the periphery of the bottom wall W4, and an erected from the bottom wall W4 A plurality of guide portions W6 thus formed are formed. The plurality of guide portions W6 are provided separately along the circumferential direction of the bottom wall W4. As can be seen from FIG. 1, each guide portion W6 is formed in a convex shape so as to protrude from the bottom wall W4 in the direction of the rotation axis of the workpiece W.

  FIG. 2 is a schematic front view of the surface W1 of the workpiece W viewed from the rotation axis direction of the workpiece W. As shown in FIG. 2, the number of guide portions W6 formed on the bottom wall W4 of the workpiece W is three in this embodiment, and these guide portions W6 are formed at equal intervals in the circumferential direction. The number of guide portions W6 is not limited to the number shown in the present embodiment. The plurality of guide portions W6 may not be formed at regular intervals. Each guide portion W6 has a substantially fan shape having an arc-shaped inner peripheral wall portion W61, an arc-shaped outer peripheral wall portion W62, a first side wall portion W63, and a second side wall portion W64 as viewed from the front. The first side wall W63 connects one end of the inner peripheral wall W61 and one end of the outer peripheral wall W62, and the second side wall W64 connects the other end of the inner peripheral wall W61 and the other end of the outer peripheral wall W62. To do. The inner peripheral wall portion W61, the outer peripheral wall portion W62, the first side wall portion W63, and the second side wall portion W64 each extend from the bottom wall W4 toward the front side (height direction) of the sheet of FIG. And the front-end edge of each of these wall parts is connected by the fan-shaped top surface W65. That is, the guide part W6 is formed by the inner peripheral wall part W61, the outer peripheral wall part W62, the first side wall part W63, the second side wall part W64, and the top surface W65. Top surface W65 is formed in parallel with bottom wall W4. The top surface W65 constitutes the tip surface of the convex guide portion W6.

  Each guide portion W6 is provided in the bottom wall W4 such that the inner peripheral wall portion W61 faces the inner diameter of the workpiece W and the outer peripheral wall portion W62 faces the outer diameter of the workpiece W. Further, one first side wall W63 of the two adjacent guide portions W6 and W6 faces the other second side wall W64. Therefore, a predetermined gap (gap G in FIG. 2) is formed between one first side wall W63 and the other second side wall W64 of two adjacent guide parts W6 and W6. A member called a pole (not shown) is disposed in the gap so as to be movable in the radial direction of the workpiece W. The dimensional accuracy of the gap is controlled relatively strictly because it is necessary to guide the pole with high accuracy and to suppress rattling of the pole in the gap. For example, the dimensional tolerance of this gap is 0 to 30 μm. In addition, the dimension of this clearance gap is 23 mm, for example.

  3 is a cross-sectional view taken along the line AA in FIG. As can be seen from FIG. 3, the surface W1 of the workpiece W has a complicated uneven shape due to the plurality of guide portions W6 and the outer peripheral wall W5 standing from the bottom wall W4. FIG. 3 shows two adjacent guide portions (a first guide portion W6a and a second guide portion W6b). A bottom wall W4 located between the first guide part W6a and the second guide part W6b, and a first side wall part W63a and a first side wall part W63a of the first guide part W6a erected from the bottom wall W4. A top surface W65a extending from the leading edge of the first side wall W63a in a direction parallel to the bottom wall W4, a second side wall W64b of the second guide W6b standing from the bottom wall W4, and a second Part of the concavo-convex shape of the surface W1 is formed by a top surface W65b formed continuously from the side wall portion W64b and extending in a direction parallel to the bottom wall W4 from the leading edge of the second side wall portion W64b.

  The first side wall portion W63a of the first guide portion W6a and the second side wall portion W64b of the second guide portion W6b face each other, and the pole is disposed in the gap G as described above. The dimension of the gap G is strictly managed. The first side wall portion W63a of the first guide portion W6a is formed along the height direction of the convex first guide portion W6a, and the second side wall portion W64b of the second guide portion W6b is a convex second guide portion W6b. It is formed along the height direction. That is, the first side wall portion W63a and the second side wall portion W64b are formed in parallel to the rotation axis direction of the workpiece W. The first side wall portion W63a and the second side wall portion W64b constitute an uneven step surface formed on the surface W1 of the workpiece W. In addition to the first side wall portion W63a and the second side wall portion W64b, the step surface is configured by, for example, an inner peripheral wall portion W61 and an outer peripheral wall portion W62 of the guide portion W6. Therefore, the step surface shown in FIG. 3 represents only a part of all the step surfaces.

  In the present embodiment, the workpiece W is formed from a metal plate by fine blanking. The formed workpiece W is then subjected to heat treatment (quenching). In the heat treatment step, first, the metal material constituting the workpiece W is heated to a temperature at which it becomes austenite by high-frequency heating. Then, it is rapidly cooled to the temperature of the martensitic transformation region (Ms point or less). Such quenching increases the hardness of the workpiece W.

  FIG. 4 is a schematic cross-sectional view of a quenching apparatus for cooling the high-frequency heated work W to complete quenching. The quenching apparatus 1 includes a first mold part 10 and a second mold part 20. The first mold part 10 and the second mold part 20 are preferably made of metal or ceramics. In particular, the first mold part 10 and the second mold part 20 are preferably formed of a material having low thermal conductivity and high heat resistance. The first mold part 10 and the second mold part 20 have constraining surfaces 11 and 21, respectively. By placing the workpiece W on the restraining surface 11 of the first mold portion 10, the workpiece W is held by the first mold portion 10. The second mold part 20 is brought close to the first mold part 10 in a state where the work W is held, and the work W is restrained in the quenching apparatus 1 by sandwiching and pressing the work between the restraining surfaces 11 and 21. The

  5A and 5B are views showing the first mold part 10, in which FIG. 5A is a perspective view and FIG. 5B is a front view showing the restraint surface 11. 6A and 6B are diagrams showing the second mold part 20, in which FIG. 6A is a perspective view and FIG. 6B is a front view showing a restraint surface 21. As shown in FIG. 5, the constraining surface 11 of the first mold 10 has a complicated shape that matches the uneven shape of the surface W <b> 1 of the workpiece W. Further, as shown in FIG. 6, the constraining surface 21 of the second mold part 20 has a complicated shape that matches the shape of the back surface W <b> 2 of the workpiece W. Further, the constraining surface 11 of the first mold part 10 and the constraining surface 21 of the second mold part 20 are openings of a plurality of cooling passages for supplying cooling water to the workpieces constrained by these mold parts 10 and 20. 31 and the space for making the supplied cooling water contact the workpiece | work W are formed.

  FIG. 7 is a schematic front view simply showing the main configuration of the first mold part 10 necessary for the description of the present embodiment. As shown in FIG. 7, the constraining surface 11 of the first mold part 10 is formed on the holding surface 12 and the holding surface 12 facing the bottom wall W4 of the workpiece W when the workpiece W is placed thereon. A plurality of holding recesses 13. The opening shape and position of the holding recesses 13 in the holding surface 12 are designed so that each guide portion W6 can enter when the workpiece W is held in the first mold portion 10. Accordingly, the holding recess 13 has an inner wall portion 131 facing the inner peripheral wall portion W61 of the guide portion W6, an outer wall portion 132 facing the outer peripheral wall portion W62, and the first side wall when the guide portion W6 enters therein. The first reference wall surface 133 that faces the portion W63 (step surface) and the second reference wall surface 134 that faces the second side wall portion W64 (step surface).

  8 is a schematic cross-sectional view taken along the line BB in FIG. FIG. 8 shows a cross-sectional shape between adjacent holding recesses (first holding recess 13a and second holding recess 13b). As shown in FIG. 8, the opening end of the first holding recess 13 a and the opening end of the second holding recess 13 b are connected by the holding surface 12. Further, a first reference wall surface 133a constituting a side wall of the first holding recess 13a extends vertically downward from one end of the holding surface 12 (left end in FIG. 8), and the other end of the holding surface 12 (in FIG. 8). From the right end portion), the second reference wall surface 134b constituting the side wall of the second holding recess 13b extends vertically downward. Both reference wall surfaces 133a and 134b are formed so that the length along the vertically lower side of the first reference wall surface 133a and the second reference wall surface 134b is equal to the height of the guide portion W6 of the workpiece W. Further, both reference wall surfaces 133a, 134b are set such that the distance S between the first reference wall surface 133a and the second reference wall surface 134b is equal to the normal dimension between the adjacent guide portions W6, W6 provided on the workpiece W. Is formed.

  A first support surface 141a is formed from the lower end of the first reference wall surface 133a in FIG. 8, and a second support surface 142b is formed from the lower end of the second reference wall surface 134b in FIG. The first support surface 141a and the second support surface 142b extend from the lower ends of the reference wall surfaces 133a and 134b in a direction parallel to the holding surface 12 (horizontal direction in FIG. 8), respectively. And the 1st projection part 151 is formed in the 1st support surface 141a, and the 2nd projection part 152 is formed in the 2nd support surface 142b.

  The first protrusion 151 is formed to protrude upward in FIG. 8 from the first support surface 141a, and the second protrusion 152 is formed to protrude upward in FIG. 8 from the second support surface 142b. The first protrusion 151 is formed so as to extend obliquely downward from the front end surface 151a facing upward in FIG. 8 and one end (right end in FIG. 8) of the front end surface 151a toward the first reference wall surface 133a. The first inclined surface 151b is provided. The second projecting portion 152 is formed so as to extend obliquely downward from the front end surface 152a facing upward in FIG. 8 and one end (left end in FIG. 8) of the front end surface 152a and facing the second reference wall surface 134b side. A second inclined surface 152b.

  The first inclined surface 151b is arranged such that the first reference wall surface 133a approaches the first reference wall surface 133a as it goes from the distal end side to the proximal end side of the first protrusion 151 (that is, from the upper side to the lower side in FIG. 8). It is inclined with respect to. The second inclined surface 152b is arranged so as to approach the second reference wall surface 134b as it goes from the distal end side to the proximal end side of the second protrusion 152 (that is, from the upper side to the lower side in FIG. 8). It is inclined with respect to.

  A first vertical wall surface 161 extends downward from the other end (the left end in FIG. 8) of the front end surface 151a of the first protrusion 151. Similarly, a second vertical wall surface 162 extends downward from the other end (right end in FIG. 8) of the tip end surface 152a of the second protrusion 152. The distance from the first reference wall surface 133a to the other end of the tip surface 151a of the first protrusion 151 and the distance from the second reference wall surface 134b to the other end of the tip surface 152a of the second protrusion 152 are the present embodiment. In each case, the thickness is 1.1 mm.

  Next, the hardening method of the workpiece | work W by the hardening apparatus 1 which concerns on this embodiment is demonstrated. Note that the workpiece W is formed by fine blanking before quenching.

  Next, the work W is heated at high frequency until the temperature of the formed work W reaches the austenitizing temperature region. The workpiece W is formed by fine blanking so that the dimension of the gap G of the workpiece W after the heating is completed is larger by about 0.5 mm to 1.0 mm than the normal dimension of the gap G. Next, the workpiece W immediately after heating is held by the first mold part 10. At this time, the surface W1 of the workpiece W is placed on the restraint surface 11 of the first mold part 10 (that is, the surface W1 of the work W faces the restraint surface 11 of the first mold part 10). The workpiece W is held by the first mold part 10. Further, the work W is placed on the restraint surface 11 of the first mold part 10 so that each guide part W6 of the work W enters each holding recess 13 of the first mold part 10.

  FIG. 9 is a partial cross-sectional schematic view showing a holding state (placement state) of the workpiece W by the first mold part 10. As shown in FIG. 9, the bottom wall W <b> 4 of the workpiece W faces the holding surface 12 of the first mold part 10. Further, adjacent guide portions (first guide portion W6a, second guide portion W6b) among the guide portions W6 of the workpiece W are held by the holding recesses (first holding recess 13a, second holding recess 13b) of the first mold part 10. ) At this time, the first side wall W63a of the first guide W6a faces the first reference wall surface 133a that forms the side wall of the first holding recess 13a, and the second side wall W64b of the second guide W6b is the second holding recess 13b. It faces the second reference wall surface 134b forming the side wall. Here, as described above, the distance (gap G) between the first side wall portion W63a of the first guide portion W6a and the second side wall portion W64b of the second guide portion W6b is about 1 mm from the normal set dimension. Largely formed. Therefore, as can be seen from FIG. 9, in a state where the workpiece W is held in the first mold part 10, the first guide part W <b> 6 a between the first side wall part W <b> 63 a and the first reference wall surface 133 a and the second guide part. A minute gap is provided between the second side wall W64b of W6b and the second reference wall surface 134, respectively.

  Further, the front end surface 151a of the first protrusion 151 of the first mold part 10 is in contact with the portion of the top surface W65a of the first guide part W6a that is close to the first side wall part W63a, and the second mold part 10 has a second surface. The tip end surface 152a of the protrusion 152 comes into contact with the portion of the top surface W65b of the second guide portion W6b that is close to the second side wall W64b. That is, in a state where the workpiece W is held by the first mold portion 10, the first protrusion 151 and the second protrusion 152 are the top surfaces (top surfaces) that form the uneven shape formed on the surface W1 of the workpiece W. W65a, W65b). That is, the workpiece W is held by the first mold part 10 while being placed on the first protrusion 151 and the second protrusion 152.

  After the work W is held on the first mold part 10 as shown in FIG. 9, the second mold part 20 is covered from the back surface W2 side of the work W. As a result, the workpiece W is sandwiched between the first mold part 10 and the second mold part 20. In this state, the restraint surface 11 of the first mold part 10 and the restraint surface 21 of the second mold part 20 face each other with the workpiece W interposed therebetween. Thereafter, the second mold part 20 pressurizes the workpiece W in a direction to press the work W against the first mold part 10. FIG. 10 is a cross-sectional view showing a state in which the workpiece W placed on the first mold part 10 is pressed by the second mold part 20.

  As shown in FIG. 10, the second mold portion 20 is formed on the top surface W65 (top surfaces W65a, W65b) of the guide portion W6 (first guide portion W6a, second guide portion W6b) among the back surface W2 of the workpiece W. The workpiece W is placed on the back surface W2 side so as to contact the back surface portion. In this state, the second mold part 20 pressurizes the work W downward in FIG. This pressurizing direction (that is, the mold clamping direction) is a direction parallel to the first reference wall surface 133 a and the second reference wall surface 134 b formed on the first mold part 10, and is placed on the first mold part 10. This is a direction perpendicular to the top surfaces (top surfaces W65a, W65b) of the workpiece W. Thus, when the 2nd type | mold part 20 pressurizes the workpiece | work W, the 1st support surface 141a of the 1st type | mold part 10 will contact the edge part near the 1st side wall part W63a among the top surfaces W65a of the workpiece | work W, and a workpiece | work. While supporting W, the 2nd support surface 142b of the 1st type | mold part 10 contacts the edge part near the 2nd side wall part W64b of the top surface W65b of the workpiece | work W, and supports the workpiece | work W. Moreover, the workpiece | work W is restrained by the 1st type | mold part 10 and the 2nd type | mold part 20 so that it cannot move to the rotating shaft direction by such pressurization. However, as shown in FIG. 10, the entire surface of the workpiece W is not restrained, and there are many unconstrained portions. Space touches the unconstrained part.

  Further, when the work W is pressed by the second mold part 20, the first protrusion 151 facing the top surface W65a of the work W bites into the top surface W65a from the tip surface 151a side, and the top surface W65b of the work W is reached. The second projecting portion 152 that has faced the bite into the top surface W65b from the tip end surface 152a side.

  When the first protrusion 151 bites into the top surface W65a of the workpiece W from the front end surface 151a side and enters the inside of the workpiece W, the material constituting the portion pushed away by the first protrusion 151 flows. Here, the 1st inclined surface 151b formed in the 1st projection part 151 inclines so that it may approach the 1st reference | standard wall surface 133a as it goes to the base end side from the front end side of the 1st projection part 151. FIG. On the other hand, the traveling direction of the first protrusion 151 with respect to the workpiece W during pressurization is a direction parallel to the first reference wall surface 133a. That is, the first inclined surface 151 b is inclined with respect to the traveling direction of the first protrusion 151. For this reason, as the first protrusion 151 enters the workpiece W by pressurization, the material pushed away by the first inclined surface 151b flows along the first inclined surface 151b, thereby approaching the first reference wall surface 133a. That is, when the first protrusion 151 enters the workpiece W from the top surface W65a, the material flow in the direction toward the first reference wall surface 133a is evoked by the presence of the first inclined surface 151b. As a result of such material flow, the first side wall portion W63a of the workpiece W finally comes into close contact with the first reference wall surface 133a as shown in FIG.

  That is, when the work W is pressed by the second mold part 20, the first protrusion 151 bites into the top surface W65a of the work W, so that the first side wall W63a of the work W comes into close contact with the first reference wall surface 133a. The first protrusion 151 having the first inclined surface 151b is provided in the vicinity of the first reference wall surface 133a to such an extent that the material flow of the workpiece W occurs.

  Similarly, when the second protrusion 152 bites into the top surface W65b of the workpiece W from the tip end surface 152a side and enters the inside of the workpiece W, the material constituting the portion pushed away by the second protrusion 152 flows. To do. Here, the 2nd inclined surface 152b formed in the 2nd projection part 152 inclines so that it may approach the 2nd reference wall surface 134b as it goes to the base end side from the front end side of the 2nd projection part 152. As shown in FIG. On the other hand, the advancing direction of the second protrusion 152 with respect to the workpiece W during pressurization is a direction parallel to the second reference wall surface 134b. That is, the second inclined surface 152 b is inclined with respect to the traveling direction of the second protrusion 152. For this reason, as the second protrusion 152 enters the workpiece W by pressurization, the material pushed away by the second inclined surface 152b flows along the second inclined surface 152b to approach the second reference wall surface 134. That is, when the second protrusion 152 enters the workpiece W from the top surface W65b, the material flow in the direction toward the second reference wall surface 134b is evoked by the presence of the second inclined surface 152b. As a result of such material flow, the second side wall W64b of the workpiece W finally comes into close contact with the second reference wall surface 134b as shown in FIG.

  That is, when the workpiece W is pressurized by the second mold portion 20, the second protrusion 152 bites into the top surface W65b of the workpiece W, so that the second side wall portion W64b of the workpiece W is in close contact with the second reference wall surface 134b. The second protrusion 152 having the second inclined surface 152b is provided in the vicinity of the second reference wall surface 134b to such an extent that the material flow of the workpiece W occurs.

  Thus, of the two adjacent guide portions W6 formed on the workpiece W, the first side wall portion W63a of the first guide portion W6a is in close contact with the first reference wall surface 133a, and the second side wall portion of the second guide portion W6b. W64b is in close contact with the second reference wall surface 134b. Therefore, the distance between the adjacent guide parts W6a and W6b is equal to the distance S between the first reference wall surface 133a and the second reference wall surface 134b formed in the first mold part 10. As described above, the distance S is set to a normal dimension of the gap G between the first side wall portion W63 and the second side wall portion W64 of the adjacent guide portions W6, W6. Therefore, the size of the concavo-convex shape of the workpiece W, particularly the size of the gap G, is corrected by the quenching apparatus 1 of the present embodiment.

  The workpiece W whose dimension of the concavo-convex shape is corrected while being constrained by the first mold part 10 and the second mold part 20 is cooled while being constrained by the first mold part 10 and the second mold part 20. In this case, as shown in FIG. 10, there is a space on the back surface portion of the bottom wall W4 among the top surfaces W65a and W65b of the guide portions W6a and W6b of the work W and the back surface W2. Cooling water is supplied into the space through the cooling passage. The workpiece W is quenched by being rapidly cooled to a temperature below the martensite start (Ms) point by cooling with cooling water. Thus, the hardening of the workpiece W is completed and the hardness of the workpiece W is increased.

  Moreover, by using the quenching apparatus 1 of this embodiment, the uneven | corrugated shaped dimension of the workpiece | work W can be corrected, and the variation in a dimension can also be made small. In FIG. 11, when the workpiece W is quenched without restraining and correcting the uneven shape (graph A), the workpiece W is restrained (clamped) by the upper mold and the lower mold, but the uneven shape is not corrected. Gap G in each of the case of quenching (graph B) and the case of using the quenching apparatus 1 of the present embodiment and quenching with the workpiece W restrained and the uneven shape corrected (graph C). It is a graph which shows the variation of. The vertical axis in FIG. 11 is the relative value of the variation when the variation (variance α) in the graph A is 1.

  As can be seen from FIG. 11, when the quenching apparatus 1 of the present embodiment (graph C) is compared with the graph A, the variation in the graph C is about ¼ of the variation in the graph A. . Moreover, when the case (graph C) using the hardening apparatus 1 of this embodiment is compared with the graph B, the variation in the case of the graph C is about 1/3 of the variation in the case of the graph B. For these reasons, according to the present embodiment, the unevenness of the uneven shape of the workpiece W can be extremely reduced.

  As described above, the quenching apparatus 1 of the present embodiment has the work W having the front surface W1 (one surface) and the back surface W2 (the other surface) facing in a direction different from the front surface W1 and the surface W1 has an uneven shape. The quenching device 1 quenches the workpiece W by cooling while restraining the workpiece W. The quenching device 1 is formed on the first mold portion 10 that holds the heated workpiece W and the first mold portion 10. A reference wall surface facing the first side wall portion W63a and the second side wall portion W64b, which are at least part of the stepped surface forming the concavo-convex shape formed on the surface W1 of the workpiece W held by the first mold portion 10 ( A first reference wall surface 133a, a second reference wall surface 134b), and a top surface forming an uneven shape formed on the surface W1 of the workpiece W formed on the first mold part 10 and held on the first mold part 10; Protruding towards In addition, a protrusion (first protrusion 151) having inclined surfaces (first inclined surface 151b, second inclined surface 152b) inclined with respect to the reference wall surface so as to approach the reference wall surface from the distal end side toward the proximal end side. The second protrusion 152), and the second mold 20 that pressurizes the work W held by the first mold 10 in a direction parallel to the reference wall surface so that the protrusion bites into the top surface from the tip. Is provided.

  According to the present embodiment, when the heated work W is held by the first mold part 10, the first side wall part W63a, which is a stepped surface constituting the uneven shape formed on the surface W1 of the work W, and The second side wall portion W64b faces the reference wall surface (first reference wall surface 133a, second reference wall surface 134b) of the first mold unit 10. Further, the protrusions (the first protrusion 151 and the second protrusion 152) face the top surfaces W65a and W65b forming the uneven shape formed on the surface W1 of the workpiece W. When the work W is pressurized by the second mold part 20 in this state, the protrusion bites into the top surface of the work from its tip. Since the protrusions are formed with inclined surfaces (first inclined surface 151b, second inclined surface 152b), the portion pushed away by the protrusion when the protrusion enters the workpiece W is along the inclined surface. Flows closer to the reference wall. By such a material flow, the size of the uneven shape of the workpiece W can be corrected. In particular, the distance between two surfaces parallel to the pressing direction by the mold can be corrected. Moreover, the unevenness | corrugation of the uneven | corrugated shape of the workpiece | work after hardening can also be made small.

  The first mold portion 10 faces the first side wall W63a (first step surface) and the second side wall W64b (second step surface), which are two step surfaces constituting the concavo-convex shape of the workpiece. The first reference wall surface 133a and the second reference wall surface 134b are formed. The protrusion protrudes toward the top surface W65a formed continuously from the first side wall portion W63a among the top surfaces constituting the concavo-convex shape of the workpiece W, and the first portion proceeds from the tip toward the base end. The first protrusion 151 having the first inclined surface 151b inclined with respect to the first reference wall surface 133a so as to approach the reference wall surface 133a, and the second side wall W64b among the top surfaces constituting the uneven shape of the workpiece W are continuous. And a second inclined surface 152b that is protruded toward the top surface W65b and is inclined with respect to the second reference wall surface 134b so as to approach the second reference wall surface 134b from the distal end toward the proximal end. 2 protrusions 152.

  Therefore, when the work W held by the first mold part 10 is pressurized by the second mold part 20, the first flow due to the material flow caused by the first protrusion 151 biting into the top surface W65a of the work W is the first. The side wall portion W63a is in close contact with the first reference wall surface 133a, and the second side wall portion W64b is in close contact with the second reference wall surface 134b due to material flow caused by the second protrusion 152 biting into the top surface W65b of the workpiece W. As a result, the distance between the first side wall W63a and the second side wall W64b is corrected to the distance between the first reference wall surface 133a and the second reference wall surface 134b. Therefore, the quenching apparatus 1 is used by setting the normal distance between the first side wall portion W63a and the second side wall portion W64b to the distance between the first reference wall surface 133a and the second reference wall surface 134b. When the workpiece W is cooled, the size of the uneven shape formed on the workpiece W, in particular, the distance between the two surfaces parallel to the pressing direction by the mold during quenching can be accurately corrected.

  Further, at the time of quenching (rapid cooling), the workpiece W is in the state where the front surface W1 side of the workpiece W faces the first mold portion 10 and the back surface W2 side faces the second mold portion 20, and the workpiece W is in the first mold portion 10 and the second mold portion 20. It is restrained (clamped) by. For this reason, deformation (distortion) in the height direction of the workpiece W (rotational axis direction of the workpiece W) can also be corrected in the quenching apparatus 1, thereby ensuring the flatness of the workpiece W.

  Further, at the time of quenching (rapid cooling), the work W is restrained by the first mold part 10 and the second mold part 20, but as shown in FIG. 10, the work W is in contact with the mold (that is, in contact with the space). Many parts) exist, and the work W can be reliably cooled rapidly by supplying cooling water to the space. As a result, the hardness (strength) of the workpiece W after quenching can be ensured.

  Further, since the dimensional accuracy of the workpiece W is ensured by correcting and forming the shape of the workpiece W at the same time as quenching, the subsequent dimensional inspection process and the dimensional correction process can be eliminated. For this reason, the manufacturing process can be shortened, and as a result, the manufacturing cost can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention should not be limited to the said embodiment. For example, in the above-described embodiment, the example of correcting the size of the gap between the first side wall portion W63a and the second side wall portion W64b of the workpiece W, that is, the size of the concave portion has been described, but the position of one step surface is corrected. A quenching device may be configured as described above. Moreover, you may comprise a hardening apparatus so that the dimension between two level | step difference surfaces provided, for example so that a some recessed part may be straddled may be corrected. Furthermore, you may comprise a hardening apparatus so that the dimension of a convex part may be corrected. When correcting the dimension of the convex part, the first mold part 10 may be configured as shown in FIG. 12, for example. The first mold portion 10 shown in FIG. 12 has a first reference wall surface 133 and a second reference wall surface 134 that face the step surfaces D1 and D2 constituting the side wall of the convex portion T of the workpiece W when the workpiece W is held. And a bottom surface 135 facing the top surface C of the convex portion T of the workpiece W, and a first protrusion 151 and a second protrusion 152 provided on the bottom surface 135. The first protrusion 151 is provided in the vicinity of the step surface D1. The first protrusion 151 has a first inclined surface 151b facing the first reference wall surface 133 side. The first inclined surface 151b is inclined with respect to the first reference wall surface 133 so as to approach the first reference wall surface 133 from the distal end of the first protrusion 151 toward the base end. On the other hand, the second protrusion 152 is provided in the vicinity of the step surface D2. The second protrusion 152 has a second inclined surface 152b facing the second reference wall surface 134 side. The second inclined surface 152b is inclined with respect to the second reference wall surface 134 so as to approach the second reference wall surface 134 from the distal end of the second protrusion 152 toward the base end.

  Then, by pressing the work W held by the first mold part 10 with a second mold part (not shown), the first projecting part 151 and the second projecting part 152 are bitten into the top surface C of the convex part T of the work W. Make it. The material flow occurs due to the first protrusion 151 entering the work W and the step surface D1 comes into close contact with the first reference wall surface 133, and the material flow occurs due to the second protrusion 152 entering the work W, resulting in a step. The surface D2 is in close contact with the second reference wall surface 134. Accordingly, the length between the step surfaces D1 and D2, that is, the dimension of the width of the convex portion can be corrected.

  Moreover, although the said embodiment demonstrated the example which used the rotating member used for the recliner mechanism of a vehicle seat as the workpiece | work W, if this is a workpiece | work formed in the surface with an uneven shape, this invention is applied. Can do. Further, the protrusions (first protrusion 151, second protrusion 152) described in the above embodiment are the reference wall surfaces (first reference wall surface 133, second reference wall surface 134) when viewed from the direction shown in FIG. ) Along the reference wall surface, or partially (for example, intermittently) with respect to the reference wall surface. Thus, the present invention can be modified without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 ... Hardening apparatus, 10 ... 1st type | mold part, 11 ... Restraint surface, 12 ... Holding surface, 13 ... Holding recessed part, 13a ... 1st holding recessed part, 13b ... 2nd holding recessed part, 20 ... 2nd type | mold part, 21 ... Constraint surfaces 133, 133a ... first reference wall surface (reference wall surface), 134, 134b ... second reference wall surface (reference wall surface), 135 ... bottom surface, 141a ... first support surface, 142b ... second support surface, 151 ... first 1 protrusion (protrusion), 151a ... tip surface, 151b ... first inclined surface (inclined surface), 152 ... second protrusion (projection), 152a ... tip surface, 152b ... second inclined surface (inclined surface) G: Gap, S: Setting dimension, T ... Projection, W ... Workpiece, W1 ... Front surface (one surface), W2 ... Back surface (other surface), W4 ... Bottom wall, W5 ... Outer wall, W6 ... Guide portion, W6a ... 1st guide part, W6b ... 2nd guide part, W61 ... Inner circumference circular arc wall part, W62 ... Outer circumference Kokabe unit, W63, W63a ... first side wall portion (step surface), W64, W64b ... second side wall section (stepped surface), W65, W65a, W65b ... top surface

Claims (5)

A quenching device that quenches the workpiece by cooling while constraining the workpiece having an uneven shape formed on the one surface while having the other surface facing the direction different from the one surface and the one surface,
A first mold part for holding the heated workpiece;
A reference wall surface facing at least a part of the step surface forming the concave-convex shape formed on the one surface of the workpiece held on the first mold portion and formed on the first mold portion;
Projected toward the top surface forming the uneven shape formed on the one surface of the workpiece formed on the first mold portion and held on the first mold portion, and from the distal end side to the proximal end A protrusion having an inclined surface inclined with respect to the reference wall surface so as to approach the reference wall surface toward the side;
A second mold part that pressurizes the work held by the first mold part in a direction parallel to the reference wall surface so that the projection part bites into the top surface from the tip thereof;
A quenching device comprising: The quenching apparatus according to claim 1,
The reference wall surface includes a first reference wall surface and a second reference wall surface formed so as to face the first step surface and the second step surface, which are two step surfaces constituting the uneven shape of the workpiece,
The protrusion is
It protrudes toward the top surface formed continuously from the first step surface among the top surfaces constituting the concavo-convex shape of the workpiece, and approaches the first reference wall surface from the tip toward the base. A first protrusion having a first inclined surface inclined with respect to the first reference wall surface;
It protrudes toward the top surface formed continuously with the second step surface among the top surfaces constituting the concavo-convex shape of the workpiece, and approaches the second reference wall surface from the tip toward the base end. And a second protrusion having a second inclined surface inclined with respect to the second reference wall surface. The quenching apparatus according to claim 2,
The first projecting portion bites into the top surface of the work when the work is pressed by the second mold portion, so that the first step surface of the work becomes the first step surface. It is provided in the vicinity of the first reference wall surface to such an extent that the material flow of the workpiece is brought into close contact with the reference wall surface,
The second projecting portion bites into the top surface of the workpiece when the workpiece is pressed by the second mold portion, whereby the second step surface of the workpiece becomes the second step surface. A quenching device provided in the vicinity of the second reference wall surface to such an extent that the material flow of the workpiece is brought into close contact with the reference wall surface. The quenching apparatus according to claim 1,
The first mold part is a support surface that supports the top surface by contacting the top surface of the work when the work held by the first mold part is pressurized to the second mold part. Have
A quenching device, wherein the protrusion is formed on the support surface. The quenching apparatus according to claim 4,
The protrusion is configured such that the stepped surface of the workpiece is in close contact with the reference wall surface when the workpiece is pressed into the top surface of the workpiece when the workpiece is pressed by the second mold portion. A quenching device provided in the vicinity of the reference wall surface to such an extent that material flow of the workpiece occurs.

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