JP4849508B2 - An induction heating and quenching method and a coil for induction heating and quenching of a disk member having an uneven portion on a plane. - Google Patents

Description

  The present invention is, for example, as shown in FIG. 1, an annular disk member W having a shape in which three convex portions 2 and three concave portions 3 are alternately provided on the same circumference in the plane portion 1, The present invention relates to a quenching method in which a plate-like member such as an annular disc member having an edge 4 is provided on the outer circumference of the plate by induction heating quenching.

Heating of the annular member by induction heating is widely performed, and Patent Documents 1 and 2 are disclosed regarding induction heating of a flat plate-like annular member having a flat plane. As shown in FIG. 4, flat annular coils C1 and C1 are fixed at predetermined intervals on both surfaces of a to-be-quenched annular member W, and are heated simultaneously from both surfaces. (Patent Documents 1 and 2).
JP-A-8-180967 JP-A-8-180966

  The methods of Patent Documents 1 and 2 are very effective for induction heating of a flat plate-shaped annular member. However, in the case where the convex portion 2 and the concave portion 3 are alternately provided on the circumference of the flat portion 1 as shown in FIG. When heated, the edge of the A part where the convex part 2 is in the vicinity of the edge 4 is less likely to rise in temperature than the edge of the B part in the vicinity of the edge 4, and the flat part, the uneven part and the edge circumference are uniform. There is a problem that it is not heated.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems and to provide a heating and quenching method in which the uneven portion, the flat portion, and the edge are all heated to a uniform heating temperature and quenched.

In order to achieve the above object, the induction heating and quenching method for a disk member having an uneven portion on the plane of the present invention has an edge on the outer circumference of the annular plane portion, and 1 or In induction heating quenching that quenches the entire edged annular disk member provided with two or more recesses and projections , an annular flat plate covering one surface of the flat surface, and an outer periphery of the edge corresponding to the edge a cylindrical induction heating coil and a cylindrical portion having an inner diameter having a gap, an induction heating coil comprising a circular conductor flat plate that covers the flat portion in correspondence with the opposite surface of the flat portion, HiyakiIri disc Arranged on both sides of the hardened disc member at an interval at which the member can be inserted, and the hardened disc member is moved to a position where one surface thereof corresponds to the heating coil on the one side and a predetermined interval. after heating the one surface of the input disc member, the該被hardening disc member other surface heating U-other side Moved to a position corresponding to the Le a predetermined distance to heat the other surface of the該被quenching disk member, and is characterized in that the entire quenching the hardened disc member by quenching.

Further, the induction heating and quenching coil of the disk member having the uneven portion on the plane of the present invention has an edge on the outer circumference of the annular plane portion, and one or more recesses on the plane portion adjacent to the edge. In induction heating quenching for quenching the entire edged annular disk member provided with a convex portion , an annular flat plate portion covering one surface of the flat surface portion and an inner diameter having a predetermined gap corresponding to the outer periphery of the edge A cylindrical induction heating coil having a cylindrical portion and an induction heating coil made of a flat annular conductor covering the flat portion corresponding to the opposite surface of the flat portion are arranged on both surfaces of the hardened disc member. It is characterized in that the hardened disc member is heated from both sides and the whole is quenched .

  When a plate-like member having projections and depressions is heated from one surface by induction heating, the temperature of the convex portion of the surface increases, but the temperature of the flat portion and the concave portion is difficult to increase. Therefore, in the present invention, since the concave portion is heated and the flat portion is heated twice from the front and back by further heating from the other surface, the temperature of the flat portion also rises and is heated uniformly.

  On the other hand, in the case of heating an annular disk member having an edge on the outer circumference and provided with one or more recesses and projections close to the edge on the plane, heating from the front and back surfaces The protrusions are heated uniformly in the same way as described above, but the edges with protrusions in the vicinity have a large heat capacity and the temperature does not rise easily, and the edges without anything in the vicinity have a small heat capacity and the temperature easily rises. There is a problem that the circumference is not heated uniformly. Therefore, by using a heating coil of a flat annular conductor on one heating coil, and using a heating coil of an annular conductor provided with a flat plate portion covering the heating surface and a cylindrical portion around the outer periphery on the other heating coil, The edge circumference is heated uniformly.

  In the above, when the plate member to be hardened is a simple flat plate, the induction heating coils on both sides are arranged at a predetermined interval on the ring-like member to be hardened, as in Patent Document 1 above. It is possible to heat from both sides. However, in the case of heating an annular disk member having an edge on the outer circumference, if a space between the heating surface and the coil is set to an appropriate distance, a quenched annular disk member is inserted between the heating coils on both sides. I can not take the gap. Therefore, although the induction heating coil may be moved, there is a problem that the structure becomes complicated. Therefore, the present invention aims to heat both surfaces by fixing the induction heating coil and moving the quenched plate-like member.

According to the induction heating and quenching method and the induction heating and quenching coil for a disk member having a concavo-convex portion on a flat surface of the present invention, the concavo-convex portion, the flat surface, and the edge portion that were conventionally difficult to be uniformly heated by induction heating are uniform. Heated to a temperature, a hardened plate-like member having not only the surface but also the entire hardened hardness is obtained.

Hereinafter, an induction heating and quenching method of a disk member having a concavo-convex portion on a plane according to the present invention will be specifically described with reference to the illustrated embodiments. FIG. 1 is an explanatory perspective view of an induction heating and quenching method for an annular disk member of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

  Hereinafter, description will be made with reference to these drawings. The to-be-quenched plate-like member of this embodiment is an annular disc member having an edge 4 provided on the outer periphery as shown in FIGS. An annular disk member W (hereinafter simply referred to as a workpiece W) has three convex portions 2 (recessed portions viewed from the back surface) on the same circumference of the annular portion 1 of the flat plate having the center hole 5 for convenience. And a recess 3 (projection seen from the back). An edge 4 is provided on the outer circumference of the annular portion 1, and the edge 4 and the concavo-convex portions 2 and 3 are close to each other.

The upper heating coil 10 is disposed on the upper surface side of the workpiece W in the drawing, and the lower heating coil 20 is disposed on the lower side with an interval at which the workpiece can be taken out. The upper heating coil 10 is composed of an annular conductor with an edge in which a cylindrical portion 12 having an inner diameter provided with a predetermined gap is provided on the outer edge of an annular flat plate portion 11 having a diameter covering the plane of the workpiece, A part of this circle is cut and terminal portions 13 and 13 are provided. The lower heating coil 20 is composed of a flat annular conductor 21 that covers the entire surface of the flat plate portion of the workpiece, and a part of a circle is cut and terminal portions 22 and 22 are provided.
The upper heating coil 10 and the lower heating coil 20 are fixedly arranged with an interval at which the workpiece W can be inserted therebetween.

  In the above configuration, a workpiece is inserted between the upper heating coil 10 and the lower heating coil 20, and the workpiece is first placed so that the gap between the workpiece and the lower heating coil 20 is a predetermined interval as shown by a chain line in FIG. And heat while rotating. Then, the lower surface of the recess 3 is first heated, but the temperature of the annular portion 1 is still low. When the lower surface of the recess 3 reaches the quenching temperature, the workpiece is moved up and heated while rotating the workpiece so that the gap between the workpiece and the upper heating coil 10 is a predetermined interval. Then, this time, the upper surface of the convex portion 2 is heated, and when the upper surface of the convex portion 2 rises to the quenching temperature, the annular portion 1 is also heated twice, so the temperature rises to the quenching temperature and the whole is heated uniformly. Further, since the edge 4 is also heated from the outer periphery by the cylindrical portion 12 of the upper heating coil 10, the entire periphery of the edge is heated uniformly.

  Thus, by quenching after heating, the entire surface of the workpiece is quenched to a uniform hardness. Although the rapid cooling is based on fountain cooling, the description is omitted because it is based on a normal cooling device.

  In Example 1, quenching was performed by induction heating and rapid cooling while rotating the workpiece using the workpiece having the shape shown in FIG. 3 and a heating coil. The dimensions are shown in Table 1. Table 2 shows the heating conditions.

  As a result of cutting the workpiece hardened under the above conditions and measuring the cross-sectional hardness, it was found that each part was quenched in the range of Hv500 to 550.

  In the above-described embodiments and examples, the quenching of the annular disk member having the edge has been described. However, in the case of heating the annular member that does not have the edge or does not require the heating of the edge, both sides of the workpiece are heated. A heating coil of a flat annular conductor that does not have a cylindrical conductor as in the first embodiment may be used as the coil. Furthermore, it can be used not only for the annular shape, but also for heating and quenching plate-like members having irregularities on the same plane.

As described above, according to the induction heating and quenching method of the disk member having the uneven portion on the plane of the present invention, it becomes possible to uniformly quench the disk member having the uneven portion, which is difficult with the conventional method. Applications of heating will be expanded, reducing the cost of heat treatment and contributing to industrial development.

It is a description perspective view of the induction heating hardening method of the annular disk member which has an uneven | corrugated | grooved part in the plane of this invention embodiment. It is XX sectional drawing of FIG. It is a figure which shows the item of the relationship between the workpiece | work and coil of this invention embodiment. It is a figure which shows the induction heating hardening method of the conventional annular member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring part ( annular plane part ), 2 convex part, 3 recessed part, 4 edge, 5 center hole, 10 upper heating coil ( cylindrical induction heating coil ), 11 flat plate part , 12 cylindrical part , 13 terminal, 20 lower heating coil , 21 Annular part ( flat annular conductor ), 22 terminal, W workpiece (annular disk member)

Claims (2)

Has an edge on the outer circumference of the annular flat portion in the induction heating quenching one or more recesses and projections to the entire quenching rimmed annular disc member which is provided on the plane portion adjacent to said edge, said A cylindrical induction heating coil having an annular flat plate portion covering one surface of the flat surface portion, an outer periphery of the edge corresponding to the edge and a cylindrical portion having an inner diameter having a predetermined gap, and an opposite surface of the flat surface portion; Te an induction heating coil comprising a circular conductor flat plate that covers the flat portion, disposed at a distance that can be inserted HiyakiIri disc member on both sides of the quench disc member, HiyakiIri disc member after heating the one surface of HiyakiIri disc member moves to a position where one side thereof corresponds to the heating coil by a predetermined distance of one side of the heating other surface該被hardening disc member is the other side It moved to a position corresponding to the coil at a predetermined distance to heat the other surface of the該被quenching disc member, HiyakiIri quenched Induction hardening method of the disc member having a concave-convex portion in a plane, characterized in that the entire quenching plate member. Has an edge on the outer circumference of the annular flat portion in the induction heating quenching one or more recesses and projections to the entire quenching rimmed annular disc member which is provided on the plane portion adjacent to said edge, said A cylindrical induction heating coil having an annular flat plate portion covering one surface of the flat surface portion, an outer periphery of the edge corresponding to the edge and a cylindrical portion having an inner diameter having a predetermined gap, and an opposite surface of the flat surface portion; And an induction heating coil made of a flat annular conductor covering the flat portion is disposed on both sides of the hardened disc member, and the hardened disc member is heated from both sides to be fully quenched. A coil for induction heating and hardening of a disk member having an uneven portion on a flat surface.

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