JP3122070U - Jig for quenching constant velocity joint members - Google Patents

Abstract

An object of the present invention is to provide a jig for inner surface quenching of a constant velocity joint member for simply placing a member to be quenched at a heating position and quenching.
In local quenching of an inner surface of a cylindrical portion of a constant velocity joint member having a cylindrical portion with a plurality of concave portions in the axial direction on the outer surface, a heating coil for heating the local portion, and a plurality of concave portions on the outer surface of the cylinder And a guide member 15 that guides the member to be hardened to the heating position, and a circumferential positioning member 12 that engages the inner periphery of the opening of the cylindrical portion and positions the member to be hardened at the heating position. The quenching member is simply placed at the heating position. The guide member is composed of a bar having a similar cross-sectional shape loosely mated with a plurality of recesses suspended from the ring member 14 on the base 11. A cylindrical external cooling means 20 for cooling the outer surface of the cylindrical portion, and a water storage plate provided between the lower end of the guide member and the base surface, and the cylindrical outer surface and the opening of the cylindrical portion during the inner surface heating of the cylindrical portion An appropriate quenching depth can be obtained by uniformly cooling the outer periphery of the.
[Selection] Figure 2

Description

  In the present invention, only the portion indicated by 3 of the inner surface of the constant velocity joint member having the cylindrical portion 1 having a cross-sectional shape with a plurality of grooves 2 in the axial direction of the outer periphery as shown in FIG. The present invention relates to a quenching jig.

Induction heating quenching of the inner surface of a cylinder is widely performed (Patent Document 1).
JP 2004-43919 A

  However, the conventional cylindrical inner surface quenching is often intended to uniformly quench the entire inner surface of the cylinder.

  The constant velocity joint member which is the subject of the present invention is required to locally quench only a part of the steel ball rolling surface on the inner surface of the cylinder. Therefore, it is difficult to obtain a large coil strength, and it takes time and effort to set the material to be hardened by aligning the local quenching surface with the coil. When placing the material to be hardened, there is a risk of damaging the coil. There is. Moreover, since the thickness of the vicinity of the opening of the cylindrical portion is thin, it is easy to be heated and the quenching layer is likely to be deep. If the hardened layer becomes deep, the constant velocity joint member may be damaged, and it is necessary to prevent this.

  Therefore, the present invention can easily place the member to be hardened so that there is no risk of damaging the coil, and the distance between the local hardening position and the coil becomes appropriate, and the opening of the cylindrical part An object of the present invention is to provide a quenching jig for a constant velocity joint member that makes the quenching depth in the vicinity of the part appropriate.

  In order to achieve the above object, the constant velocity joint member quenching jig according to the present invention is a local quenching of the inner surface of the cylindrical portion of the constant velocity joint member having a cylindrical portion with a plurality of concave portions in the axial direction on the outer surface. And a heating coil disposed on the base for heating a predetermined local portion of the cylindrical portion, and when the opening of the cylindrical portion is placed toward the base, the plurality of concave portions of the outer surface are loosely joined to be fired. A guide member that guides the quenching member to a heating position on the base, and a circumference that engages the inner circumference of the opening of the cylindrical portion provided on the base and positions the quenching member at the heating position. And a positioning member.

  That is, the cross section of the cylindrical portion of the constant velocity joint member has a complicated shape as shown in FIG. 4, and it is required to quench only the local portion indicated by symbol 3 in FIG. At this time, a coil as shown in FIG. 3 and symbol 7 is used. However, when the member to be quenched is set at the coil position, there is a risk that the member may come into contact with the coil and break the coil. Therefore, it takes time and effort to place the member to be quenched at the quenching position.

  Accordingly, the present invention provides a coil in which a member to be hardened is provided on a base by providing a guide member loosely engaged with a plurality of grooves on the outer surface of the cylindrical portion, and inserting the plurality of grooves in accordance with the guide members. There is no danger of contact with the metal, and it can be placed at the quenching position. Then, by engaging the circumferential positioning member provided on the base with the inner circumference of the opening of the cylindrical portion of the member to be hardened, the member to be hardened is easily positioned at the coil position.

  Further, in the present invention, the guide member is made of a bar material having a cross-sectional shape substantially similar to the concave portion loosely engaged with a plurality of concave portions of the outer surface of the cylindrical portion suspended from a holding member disposed on the base. The cylindrical outer cooling means for cooling the outer surface of the cylindrical portion during the heating of the inner surface of the cylindrical portion, and the outer periphery in the vicinity of the opening of the cylindrical portion provided between the lower end of the guide member and the base surface are evenly cooled. It is desirable to provide a water storage plate.

Thus, by using a bar having a cross-sectional shape substantially similar to the plurality of recesses as the guide member, the member to be hardened can be placed at the heating position without fear of damaging the heating coil. Moreover, the quenching depth of the predetermined local part of the inner surface of a cylindrical part can be made appropriate by providing a cylindrical external cooling means and cooling the outer periphery of a cylindrical part at the time of a heating. Furthermore, by providing a water reservoir plate on the outer periphery in the vicinity of the opening of the cylindrical portion, it is possible to prevent the quenching depth of the opening from becoming large by controlling the flow of the cooling water on the outer periphery in the vicinity of the opening.
By placing the member to be hardened on the base in such a configuration, heating a predetermined quenching portion of the quenching member with a heating coil, and cooling by an internal cooling means (not shown), the uniform quenching portion is uniform. A hardened layer can be formed.

  According to the constant velocity joint member quenching jig of the present invention, the quenched member can be quickly placed at the coil position without risk of coil breakage, so that the number of quenching steps can be reduced and the heat treatment cost can be reduced. Can be reduced.

  Hereinafter, the hardening jig | tool of the constant velocity joint member of this invention is demonstrated concretely by embodiment of illustration. 1 is a plan view of a quenching jig according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX, FIG. 3 is a diagram showing the shape of a heating coil used, and FIG. FIG. 4B is a YY cross-sectional view of the constant velocity joint member used in FIG.

Hereinafter, description will be made with reference to these drawings. First, the to-be-quenched constant velocity joint member (hereinafter referred to as a workpiece W) according to the present embodiment has a deformed cylindrical portion having axial recesses 2 provided at three locations on the outer periphery of the cylinder 1, as shown in FIG. In addition, the bottom 4 has a shape in which the shaft 5 is provided. And only the local part 3 of the inner surface of the recessed part 2 of a cylindrical part is quenched. For this purpose, as shown in FIG. 3, three U-shaped heating coils 7 are arranged on the base 11 so that the feet 8 correspond to the hardened local portions 3. The local part 3 is heated and quenched by a cooling means (not shown) for quenching.
At this time, since the thickness of the vicinity of the opening 1a of the cylinder 1 is thin, if the quenching depth is increased, there is a risk that the member may crack during use. I need to do it.

  Next, the quenching jig of the present invention will be described with reference to FIGS. On the base 11, three circumferential positioning members 12 are disposed on the circumference of the cylindrical opening of the workpiece W, and the tip 12a engages with the inner circumference of the cylindrical opening, W is positioned at a corresponding position of the heating coil 7.

  Further, three support columns 13 are planted on the base 11 to instruct the ring member 14 (holding member) to be concentric with the workpiece W. The ring member 14 is an annular plate having an inner diameter through which a workpiece passes, and holds three guide members (bar members) 15 suspended. The guide member 15 is a bar material having a cross-sectional shape similar to the concave portion of the cylindrical portion of the workpiece W, and is disposed so that the concave portion is loosely engaged at three positions corresponding to the concave portion. A gap is provided between the lower portion of the guide member 15 and the base surface.

  A cylindrical external cooling means 20 is provided on the outer periphery of the workpiece W. The cylindrical external cooling means 20 comprises a hollow double cylinder 21 and cools the work outer surface by injecting a cooling liquid from an injection port 22 on the inner surface of the double cylinder while heating the work inner surface, so that the quenching surface has an appropriate quenching depth. It is like that. A water storage plate 23 is provided in the gap between the lower portion of the guide member 15 and the base surface. The water storage plate 23 is formed of a thin ring-shaped disk so that the cooling water sprayed from the inner surface of the cylindrical external cooling means 20 is dispersed in the vicinity of the cylindrical opening as shown by the arrows in the figure so as to cool the opening appropriately. It has become.

Hereinafter, the operation of the quenching jig of the present invention having the above configuration will be described.
The cylindrical portion 1 of the workpiece W is inserted on the base 11 from the inner periphery of the ring material 14. At this time, the concave portion 2 of the workpiece W is inserted so as to be aligned with the guide member 15. Since the guide member 15 has a cross-sectional shape similar to that of the recess 2 and is set so that the recess 2 is loosely engaged, the workpiece is smoothly inserted without touching the heating coil 7. And the opening part of the workpiece | work W is set | placed on the position of the circumferential positioning member 12, and the front-end | tip 12a of the circumferential positioning member 12 is engaged with the inner periphery of an opening part, and is mounted.

  Thereby, the to-be-heated part 3 and the heating coil 7 of the workpiece | work W are hold | maintained at an appropriate space | interval. In this state, the heating coil 7 is energized to heat the heated part 3. During heating, the outer periphery of the work cylinder is heated while being cooled by the cylinder external cooling means 20. When the quenching portion on the inner surface of the cylinder reaches the quenching temperature, the quenching portion is quenched and quenched by a cooling means (not shown). At this time, since the vicinity of the opening of the cylindrical portion is appropriately cooled by the water storage plate 23, the hardened portion on the inner surface of the cylindrical portion is quenched to an appropriate depth without increasing the quenching depth near the opening. .

  As described above, according to the quenching jig of the present invention, there is no risk that the workpiece touches the heating coil when the workpiece is placed, and the workpiece can be easily placed at an appropriate position. It can be improved.

  As described above, according to the constant velocity joint quenching jig of the present invention, there is no risk of breakage of the heating coil, and the work can be placed in the heating position in a short time, so that the work efficiency can be improved and the cost can be reduced. .

It is a top view of the hardening jig | tool of the constant velocity joint of embodiment of this invention. It is XX sectional drawing of FIG. It is a figure which shows the shape of the heating coil of embodiment of this invention. It is a diagram of a constant velocity joint used in the embodiment of the present invention,

Explanation of symbols

W Workpiece (hardened constant velocity joint member), 1 cylindrical part, 2 concave part, 3 quenching part, 4 lid part, 5 axis, 7 heating coil, 8 foot part, 11 base, 12 circumferential positioning member, 13 support , 14 Ring material (holding member), 15 guide member, 20 cylindrical external cooling means, 21 hollow double cylinder, 22 injection port, 23 water storage plate

Claims (2)

In the local quenching of the inner surface of the cylindrical portion of the constant velocity joint member having a cylindrical portion having a plurality of concave portions in the axial direction on the outer surface, a heating coil disposed on the base and heating a predetermined local portion of the cylindrical portion, and the cylinder A guide member that loosely engages with the plurality of recesses on the outer surface and guides the member to be hardened to a heating position on the base when the opening of the portion is placed toward the base, and the guide member provided on the base A quenching jig for a constant velocity joint member, comprising: a circumferential positioning member that engages with an inner circumference of an opening of a cylindrical portion to position a quenching member at the heating position. The guide member is made of a bar material having a cross-sectional shape substantially similar to the concave portion that loosely engages with a plurality of concave portions on the outer surface of the cylindrical portion suspended from a holding member disposed on the base. A cylindrical external cooling means for cooling the outer surface of the cylindrical portion during inner surface heating, and a water storage plate for uniformly cooling the outer periphery in the vicinity of the opening of the cylindrical portion provided between the lower end of the guide member and the base surface; The jig for quenching a constant velocity joint member according to claim 1, comprising:

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