JP2000129344A - Cooling jacket for hardening inner surface of cylindrical work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling jacket suitable to a sub-jacket in the case of shiftingly hardening both wall surfaces of groove parts arranged at plural positions in the peripheral direction on the inner surface of a cylindrical work. SOLUTION: This cooling jacket is constituted of a laminated body 40 constituted by laminating plural plate materials 41, 42, 43. A first flowing passage is formed between the plate materials 41, 42 by the radiating groove parts 41b arranged on the upper surface of the plate material 41. A second flowing passage is formed between the plate materials 42, 43 by the radiating groove parts 42b arranged on the upper surface of the plate material 42. The laminated body 40 is connected with the front in the shifting direction of a heating coil for heating both wall surfaces of the groove parts arranged at plural positions in the peripheral direction in the inner surface of the cylindrical work, and the cooling liquid is injected onto the bottom surface of the groove part. At the same time of completing the heating of both wall surfaces, the cooling liquid is supplied into the second flowing passage at the upper stage and injected onto both wall surfaces of the groove part to rapidly cool and harden the last heating part on both wall surfaces. Since the thickness of the laminated body 40 is thin, both wall surfaces are heated and hardened to the edge parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling jacket used for quenching an inner peripheral surface of a cylindrical work, and more particularly, to a cooling jacket for a work having an inner surface groove such as a housing of a tripod type constant velocity joint. The present invention relates to a cooling jacket which is particularly suitable as a subjacket used when quenching both wall surfaces to be sandwiched in a limited manner.

[0002]

2. Description of the Related Art A housing of a tripod type constant velocity joint is internally hardened. The shape of the housing and the method of hardening the inner surface will be described with reference to FIGS. The housing 10 is a cylindrical body whose one end is closed, and grooves 11 extending in the axial direction are provided at three circumferential positions on the inner peripheral surface, respectively. It is required for the wall surfaces 12, 12 on both sides sandwiching 11.

[0003] In the internal hardening of the housing 10, the heating coil 20 and the cooling jacket 30 move from the bottom up in the housing 10 with the housing 10 standing upright with its open side down. The heating coil 20 has three grooves 1
1, 11 and 11, each of which has three convex portions 21, 21 and 21 which are fitted with a gap therebetween.
The high-frequency induction heating of the wall surfaces 12, 12 together with the bottom surface 13 is performed from bottom to top. A cooling jacket 30 formed of an annular body having substantially the same shape as the heating coil 20 is connected to the rear of the heating coil 20 in the moving direction, that is, below, and sprays the cooling liquid supplied therein to the heating surface of each groove 11. . Thereby, the wall surfaces 12, 12 of each groove 11 move and quench from the bottom to the top together with the bottom surface 13.

[0004] This moving quenching ends when the heating coil 20 moves to the upper end in the housing 10, but the last heating section is not cooled only by spraying the coolant with the cooling jacket 30. For this reason, a quenching liquid introduced above the heating coil 20 by, for example, another pipe is sprayed on the last heating section.

In the above-described moving quenching, the wall surfaces 12, 12 of each groove 11 are quenched together with the bottom surface 13.
Depending on the required specifications, it may be necessary to harden only the wall surfaces 12 and 12 and omit the hardening of the bottom surface 13. In this case, a portion facing the bottom surface 13 of each convex portion 21 of the heating coil 20 is depressed inward, or a core is attached to this portion,
Although the heating of the bottom surface 13 is suppressed, since there is also conduction heat from the wall surfaces 12 and 12 on both sides, it is difficult to suppress the heating to the extent that the bottom surface 13 is not quenched only by taking measures against the heating coil 20. is there. Therefore, the bottom surface 13 is directly water-cooled from inside the housing 10 during the heating of the wall surfaces 12, 12.

In the internal quenching of the housing 10, so-called one-shot quenching without moving the heating coil 20 in the housing 10 is also performed.

[0007]

However, the conventional moving quenching has the following problems in direct water cooling of the bottom surface 13 when only the wall surfaces 12 and 12 are quenched.

As a method of directly cooling the bottom surface 13 with water when only the wall surfaces 12 and 12 are quenched, a method of introducing a cooling liquid above the heating coil 20 with a separate pipe and spraying the cooling liquid onto the bottom surface 13 is generally used. However, in this method, the bottom surface 13
Since the cooling liquid cannot be sprayed in a limited area, the cooling liquid is applied to the portion of the wall surfaces 12 and 12 to be heated or the portion being heated. As a result, the quenching quality of the wall surfaces 12, 12 is reduced.

In order to spray the cooling liquid to the bottom surface 13 in a limited manner, a cooling jacket having the same structure as that of the cooling jacket 30 connected below the heating coil 20 may be connected above the heating coil 20 as a sub-jacket. It is considered effective. However, since the conventional cooling jacket has a hollow structure, it is essentially thick. In addition, since the sub-jacket must also have a function of spraying a cooling liquid to the final heating section of the wall surfaces 12, 12, it is necessary to have two independent flow paths. For these reasons, the thickness of the sub-jacket becomes very large, and as a result, the upward movement distance of the heating coil 20 is limited, and the wall 12,
There is a problem that quenching cannot be performed to the end of the twelfth.

[0010] The one-shot quenching also has a similar problem with direct water cooling of the bottom surface 13 when only the wall surfaces 12 and 12 are quenched.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended for a sub-jacket in which both wall surfaces sandwiching a groove portion of a work having an inner surface groove such as a housing of a tripod constant velocity joint are limitedly hardened. It can be used to spray the coolant on both walls and bottom independently.
It is an object of the present invention to provide a cooling jacket for hardening the inner surface of a thin cylindrical work capable of securing a sufficient moving distance of a subsequent heating coil.

[0012]

In order to achieve the above object, a cooling jacket for internal hardening of a cylindrical work according to the present invention includes a heating coil for hardening an inner peripheral surface of the cylindrical work. A cooling jacket inserted into the cylindrical work, which is configured by laminating a plurality of plate members in the axial direction of the cylindrical work, the outer peripheral surface of which is a laminate facing the inner peripheral surface of the cylindrical work, The laminated body is provided with a groove that extends radially outward from the center and is open at each end to the outer peripheral surface of the laminated body on at least one of the opposing surfaces of the plurality of plate members constituting the laminated body. A radial flow path formed between the plate members, and the cooling liquid supplied to the flow path is sprayed from the outer peripheral surface of the laminate to the inner peripheral surface of the cylindrical work.

In the cooling jacket for quenching the inner surface of a cylindrical work according to the present invention, by forming the laminated body from three or more plate members, a plurality of types of independent quenching liquid jetting positions different from each other are formed therein. The radial passage thus formed can be formed in a plurality of stages in the axial direction of the cylindrical work. In addition, 3
Even if it is constituted by two or more plate members, its thickness can be suppressed to be thin.

Such a thin cooling jacket having a plurality of types of independent flow passages has two wall surfaces sandwiching a groove portion of an inner surface grooved work provided with grooves extending in the axial direction at a plurality of positions on an inner peripheral surface. It is suitable for a sub-jacket that is used by being connected to the back side of a cylindrical work when quenching is limited.

That is, a cooling jacket suitable as a sub-jacket is composed of a laminate formed by laminating three plate members, and includes a plurality of convex portions which are fitted with a gap in each groove portion of a work having an inner surface groove. In addition to being provided on the outer peripheral surface, one end of each of two types of radial flow paths formed in two stages in the axial direction of the cylindrical work is opened at the end surface of the convex portion facing the bottom surface of the groove, and Each flow path has a configuration in which each end of the flow path is opened on both side surfaces of the convex portion facing the wall surface on both sides of the groove portion. With this configuration, the cooling liquid is constantly sprayed on the bottom surface of the groove portion, and the final heating portions on both wall surfaces are formed. The operation which sprays a cooling liquid on a machine is enabled.

The liquid supply pipe for supplying the quenching liquid to the two radial flow paths is a double pipe in which an inner pipe and an outer pipe are combined, and the inside of the inner pipe is connected to one of the two flow paths. The one connected to the center and the one between the inner pipe and the outer pipe connected to the center of the other flow path is preferable from the viewpoint of avoiding interference with the lower heating coil, the main jacket and the like.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view of a cooling jacket for internal hardening of a cylindrical work according to an embodiment of the present invention, FIG. 2 is a perspective view of an assembled state of the cooling jacket, and FIG.
FIG. 4 is a schematic configuration diagram of an inner surface moving quenching device showing a use state of the cooling jacket, and FIG. 4 is a schematic configuration diagram of an inner surface quenching device when the cooling jacket is used for so-called one-shot quenching.

The cooling jacket for internal hardening of a cylindrical work according to the embodiment of the present invention is used for internal hardening of a housing of a tripod type constant velocity joint. More specifically, it is used for limited movable quenching of the wall surfaces 12, 12 on both sides of the groove 11 formed at three circumferential positions on the inner peripheral surface of the housing 10 (see FIG. 5).

As shown in FIG. 1 and FIG. 2, the cooling jacket for inner quenching comprises a laminated body 40 formed by laminating three plate members 41, 42, 43. The laminate 40 is
It is inserted into the housing 10 with the laminating direction coinciding with the axial direction of the housing 10. This laminate 40 has a thickness of 120
Three projections 44 symmetrically projecting outward at equal intervals of
44, 44, and three projections 44, 44, 44
Are fitted in the three grooves 11, 11, 11 of the housing 10 with a gap.

The three plate members 41, 4 constituting the laminate 40
2 and 43, the liquid supply hole 4 is provided at the center of the lower plate 41.
1a is provided. A liquid supply hole 4 is provided on the upper surface of the plate material 41.
Three grooves 41b, 41 extending in three directions from 1a
b and 41b are provided. Each groove portion 41b passes through the convex portion 41c of the plate member 41 forming the convex portion 44 of the laminated body 40, and reaches the tip end surface of the convex portion 41c. As a result, between the plate members 41 and 42, each tip is formed by each convex portion 44 of the laminate 40.
A radial first flow path that opens as a cooling liquid ejection port 45 is formed at the tip end surface of the liquid crystal display.

The center of the middle plate 42 is provided with a liquid supply hole 41.
A liquid supply hole 42a having a smaller diameter than a is provided. Plate 42
Are provided with three grooves 42b, 42b, 42b extending from the liquid supply hole 42a in three directions. Each groove portion 42b is formed of a plate material 42 forming the convex portion 44 of the laminate 40.
At the convex portion 42c, and reaches both side surfaces of the convex portion 42c. Thereby, between the plate members 42 and 43, each tip is provided on both side surfaces of each convex portion 44 of the laminated body 40 with the cooling liquid ejection port 4.
A radial second flow path opening as 6, 46 is formed,
In addition to the above-described first flow path, two independent flow paths are formed in the stacked body 40 in two stages.

A liquid supply pipe 5 for supplying a cooling liquid to the laminate 40
Numeral 0 is a double pipe in which an outer pipe 52 is combined with a gap outside the inner pipe 51. The outer pipe 52 is connected from below to a liquid supply hole 41 a provided at the center of the plate member 41.
The inner pipe 51 passed through the outer pipe 52 is connected to the liquid supply hole 4 of the plate 41.
1a, it is connected to the liquid supply hole 42a of the plate 42 from below. By supplying the cooling liquid between the outer pipe 52 and the inner pipe 51, the cooling liquid flows into the first flow path formed between the plate members 41 and 42, and the leading end of each convex portion 44 of the stacked body 40 It is ejected from an ejection port 45 opening on the surface. In addition, inner pipe 5
By supplying the cooling liquid into the inside 1, the cooling liquid flows into the second flow path formed between the plate members 42 and 43, and the ejection ports 46 opened on both side surfaces of each convex portion 44 of the laminate 40. , 46
Squirted from.

As described above, the cooling jacket for internal hardening of a cylindrical workpiece according to the embodiment of the present invention is used for internal moving hardening of a housing of a tripod type constant velocity joint. As shown in FIG. 3, the inner surface moving quenching apparatus using the cooling jacket includes a heating coil 20, a cooling jacket 30 provided as a main jacket below the heating coil 20, and a sub jacket above the heating coil 20. And the above-mentioned laminated body 40, which are integrally connected.

The heating coil 20 has the same basic structure as the heating coil 20 shown in FIG.
There are three protrusions that fit into the three grooves 11, 11 and 11, and each protrusion is depressed inward at a portion facing the bottom surface 13 in order to suppress heating of the bottom surface 13 of the groove 11 of the housing 10. And measures such as attaching a core to this part. The cooling jacket 30 as a main jacket is an annular body having the same hollow structure as conventionally used, and sprays a cooling liquid onto the wall surfaces 12, 12 on both sides of the groove 10 of the housing 10. Laminate 4
And a heating liquid supply pipe 50 for supplying a coolant to the heating coil 20.
The lead for supplying power to the power supply is guided downward through the inside of the cooling jacket 30.

Next, a method for moving and quenching the inner surface of the housing 10 using the above-described inner surface moving quenching apparatus will be described.

The housing 1 is inserted into the inner surface moving hardening device from above.
Set 0. Thereby, the heating coil 20 is inserted into the lowermost part in the housing 10. 3 of heating coil 20
The three protrusions 44, 44, 44 of the stacked body 40 arranged above the three protrusions and the heating coil 20 are connected to the housing 10.
The three grooves 11, 11, 11 are respectively fitted. In this state, the high-frequency current is supplied to the heating coil 20 and the cooling liquid is supplied to the first flow path formed in the cooling jacket 30 and the lower part of the stacked body 40 while the cooling liquid is being supplied. Instead of raising them, it is possible to lower the housing 10 and move them upward relative to the housing 10.

As a result, the two wall surfaces 12, 12 of the three groove portions 11, 11, 11 of the housing 10 are sequentially heated from bottom to top, and the cooling liquid is jetted from the cooling coil 30 to the heating portion, so that Both wall surfaces 12 are moved and quenched from bottom to top.

Further, the cooling liquid supplied to the first flow path in the laminated body 40 is supplied to a jet port 45 opening at the tip end surface of each projection 44.
From the bottom surface 13 of each groove 11 of the housing 10. Thereby, heating of the bottom surface 13 is suppressed.

When the laminate 40 reaches the uppermost portion in the housing 10, the rise of the laminate 40, the heating coil 20, and the cooling jacket 30 is stopped. Further, the power supply to the heating coil 20 is stopped. Then, the coolant is supplied to the second flow path formed in the upper stage in the stacked body 40. The second in the laminate 40
The cooling liquid supplied to the flow path is supplied to each groove 11 of the housing 10 from the ejection ports 46, 46 opened on both side surfaces of each projection 44.
Are sprayed on both wall surfaces 12, 12. As a result, the two wall surfaces 1 that are not rapidly cooled by the liquid injection from the cooling jacket 30
The cooling liquid is supplied to the final heating sections 2 and 12, and this section is also quenched.

As described above, since the laminated body 40 has two independent upper and lower channels, the heating of the bottom surface 13 is suppressed while the both wall surfaces 12 and 12 are being heated, thereby preventing quenching. After the heating of both wall surfaces 12, 12, the final heated portion is rapidly cooled and the final heated portion is quenched. Moreover, since the stacked body 40 has a thin shape despite having two independent upper and lower flow paths, the heating coil 20 is located inside the housing 10 despite being disposed above the heating coil 20. Allow to move to the top. For this reason, both wall surfaces 12, 12
Is quenched to the end.

In the above embodiment, the laminated body 40 is used as a sub jacket, but can be used not only as a sub jacket but also as a main jacket disposed below the heating coil 20. The flow path in the laminate 40 is 2
Although formed in steps, three or more types of independent flow paths can be formed if the laminate 40 is formed of four or more plate members. Grooves on the surface of the plate for forming the flow path may be provided on both opposing surfaces of the adjacent plate. Further, the groove may be formed not only directly on the surface of the plate material but also by using a spacer. In that case, one plate material is formed by the base plate and the spacer.

The object to be quenched is applicable not only to both wall surfaces of the housing of the tripod constant velocity joint but also to partial cooling in the circumferential direction of the inner surface when the bottom surface is quenched together with both wall surfaces. It can also be applied to internal hardening of cylindrical workpieces.

In the above embodiment, the cooling jacket for internal hardening of the cylindrical workpiece is used for internal moving hardening.
As shown in FIG. 4, the heating coil 20 can be used for so-called one-shot quenching in which the heating coil 20 is not moved with respect to the housing 10.

[0034]

As described above, the cooling jacket for quenching the inner surface of the cylindrical work according to the present invention has a laminated structure, so that a plurality of independent flow paths can be easily formed in a plurality of stages and the cooling jacket is thin. It is a shape. For this reason, it is used as a sub-jacket when moving and quenching the two walls sandwiching the groove of a work with an inner surface groove such as the housing of a tripod constant velocity joint. Can be sprayed, and a sufficient moving distance of the subsequent heating coil can be secured. Therefore, both the wall surfaces can be limitedly moved and hardened from one end to the other end with high quality.

Further, the cooling jacket for internal hardening of the cylindrical work can be used for one-shot hardening, and is of high use value.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a cooling jacket for moving and hardening an inner surface of a cylindrical workpiece according to an embodiment of the present invention.

FIG. 2 is a perspective view of the cooling jacket in an assembled state.

FIG. 3 is a schematic configuration diagram of an inner surface moving quenching apparatus showing a use state of the cooling jacket.

FIG. 4 is a schematic configuration diagram of an inner surface quenching apparatus when the cooling jacket is used for so-called one-shot quenching.

FIG. 5 is a sectional view of a housing of the tripod constant velocity joint, together with a heating coil used for moving quenching of an inner surface thereof.

FIG. 6 is a schematic configuration diagram of a conventional quenching apparatus used for the moving quenching.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Housing (tubular work) of a tripod constant velocity joint 11 Groove part of housing (cylindrical work) 12 Wall surface 13 Bottom surface 20 Heating coil 21 Convex part of heating coil 30 Cooling jacket (main jacket) 40 Laminate (subjacket) 41 , 42, 43 Plate 41a, 42a Liquid supply hole 41b, 42b Plate groove 41a, 42b, 43c Plate convex 44 Stacked convex 45, 46 Spout 50 Liquid supply pipe 51 Inner pipe 52 Outer pipe

Claims (4)

[Claims] In order to quench the inner peripheral surface of a cylindrical work,
A cooling jacket that is inserted into a cylindrical work together with a heating coil, and is configured by laminating a plurality of plate members in the axial direction of the cylindrical work, and has an outer peripheral surface facing an inner peripheral surface of the cylindrical work. The laminated body is provided with a groove that extends radially outward from the center portion and at which each end reaches the outer peripheral surface of the laminated body on at least one of the opposing surfaces of the plurality of plate members constituting the laminated body. Having a radial flow path formed between the plate members in the laminate, and injecting the quenching liquid supplied to the radial flow path in the laminate from the outer peripheral surface of the laminate to the inner peripheral surface of the cylindrical work. A cooling jacket for internal quenching of cylindrical work, characterized by the following. 2. The laminated body is composed of three or more plate members, in which a plurality of types of independent radial flow paths having different quenching liquid jetting positions are provided inside a shaft of a cylindrical work. The cooling jacket for quenching the inner surface of a cylindrical work according to claim 1, wherein the cooling jacket is formed in a plurality of stages in a center direction. 3. The cylindrical work is an inner surface grooved work provided with grooves extending in an axial direction at a plurality of positions on an inner peripheral surface, and the laminated body is connected to a back side of the cylindrical work. The cooling jacket for internal hardening of a cylindrical work according to claim 2, wherein the cooling jacket is a sub-jacket to be used. 4. The laminated body is composed of three plate members, and has a plurality of convex portions on the outer peripheral surface which are fitted into the respective groove portions with a gap therebetween, and has therein two or more convex portions in the axial direction of the cylindrical work. It has two types of radial channels formed in a step, and each tip of one channel is opened at the tip surface of a convex portion facing the bottom of the groove, and each tip of the other channel is a groove. 4. The cooling jacket for quenching the inner surface of a cylindrical work according to claim 3, wherein openings are formed on both side surfaces of the convex portion facing the wall surfaces on both sides of the cylindrical work.