JPH0241158Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) When an annular body is hardened, the present invention is designed to insert it into the ring of the heated annular body so that the inner diameter of the ring is maintained at a predetermined value. This invention relates to an annular body hardening cooling plug that restrains the annular body.

(Prior Art) Annular body quenching cooling plugs that are inserted into the ring of a heated annular body to restrain distortion during rapid cooling include a split type, an outer diameter enlarged type, a reduced type, and a forced pull-out type.

The plug according to the present invention belongs to the forced extraction type, and for example, the present applicant applied for a patent in Japanese Patent Application No. 56-133409, and the invention was published as a patent application in Japanese Patent Application Laid-open No. 58-37124. It is used in a method and apparatus for cooling annular bodies by quenching in place. The method of use will be explained below with reference to FIGS. 2a and b.

The annular body heated in the heating station is QS
The cooling station shown as is transferred and placed on the mounting table B so that its end surface is in contact with it. Mounting table B
A through hole H is provided in the center, and a plug 1', which is placed below the mounting table B and can be vertically displaced by a cylinder S, rises through the through hole H, and the plug 1' is placed under the mounting table B.
It is inserted into the ring of the upper annular body W. Above plug 1
' has an outer diameter approximately equal to the inner diameter of the annular body W, and the peripheral edge of its tip end face is chamfered c to facilitate the intrusion of the annular body W into the ring. Furthermore, a blind hole h of a predetermined depth is provided in the center of the end face along the axis. Above the mounting table B, a cooling jacket J and a cup-shaped annular end face pressing member P with an open end facing downward are arranged, and can be moved up and down simultaneously by a drive mechanism (not shown).
The cooling jacket J is positioned so as to surround the outer periphery of the annular body W on the mounting table B at a predetermined interval when descending. The annular body end face pressing member P is set to have a smaller diameter than the inner diameter of the cooling jacket J and to match the ring diameter of the annular body W, and has a plurality of wide gaps s on its side circumferential wall, so that when descending, it is The periphery of the open end surface is brought into contact with the upper end surface of the annular body W, and this is pressed against the mounting table B, so that the cooling fluid injected from the cooling jacket J can impinge on the annular body W through the gap s. Further, in the center of the bottom surface of the annular end face holding member P, a rod R is arranged which penetrates the bottom wall and can move forward and backward along the axis, and when moving forward, its tip enters the blind hole h of the plug 1'. to position the annular body W.

The annular body W is inserted into a plug 1' having approximately the same diameter as the inner diameter of the ring, and is rapidly cooled and quenched while being restrained in the inner circumferential direction and by being pressed onto the mounting table B by the annular body end face holding member P and restrained in both end face directions. be done. The annular body W after quenching is released from the restraint in the inner circumferential direction by displacing the plug 1' downward while being pressed against the mounting table B by the annular body end face pressing member P, and then the annular body end face is Due to the upward displacement of the holding member P,
After being released from the restraints in the direction of both end faces, it is carried out from the cooling station QS.

The plug 1' is used as described above, but if the inner ring wall of the annular body W has a circumferential surface, the outer circumference of the plug 1' is set to have approximately the same diameter as the circumference, and If the tooth crest has the same height as the entire circumference of the inner wall of the ring, by setting the outer periphery of the plug 1' to approximately the same diameter as the tooth crest, the ring inner diameter dimension can be extremely improved, as well as in the end face direction. Constraint hardening to achieve a highly accurate finish can be carried out with high efficiency.

(Problems existing in the prior art) However, if there are intermittent recesses and protrusions on the inner wall of the annular body W, and a plurality of teeth with a top surface lower than the top surface of the protrusions are formed between them, the plug If the outer circumference of plug 1' is set to have approximately the same diameter as the top surface of the convex portion, the arc length of the abutment area on the outer circumference of plug 1', which should restrain shrinkage strain during rapid cooling toward the inner circumference, is extremely short. In addition, since the non-contacting portion of the inner wall of the ring of the annular body W may be small, for example, it may protrude in the inner diameter direction or become undulating, resulting in a disadvantage that the inner diameter cannot be finished to a precise predetermined inner diameter dimension. It was hot.

(Purpose of the invention) The present invention is applicable to the case where a heated annular body having intermittent recesses and protrusions on the inner circumferential wall and a plurality of tooth profiles with the top surface lower than the top surface of the protrusions is formed between them by restraint hardening. To provide a plug for hardening and cooling an annular body, which has been made to solve the above-mentioned problems of conventional plugs, and is capable of finishing the inner diameter of the annular body to a precise predetermined inner diameter dimension in the entire circumferential direction. The purpose is to

(Structure of the invention) The structure of the invention is as follows: (1) A heated annular body having intermittent recesses and protrusions on the inner circumferential wall, and a plurality of teeth with a top surface lower than the top surface of the protrusions formed therebetween. (2) A plug to be inserted into the ring of the annular body when restraint hardening is applied to the annular body. An annular hardened cooling plug characterized in that the plug is formed by forming an annular body.

(Example) The present invention will be described in detail below according to an example shown in FIG.

The inner wall of the annular body W shown in FIG. 1 has intermittent recesses Wd and protrusions Wc, and there are
A plurality of tooth profiles Ws are formed with a top surface t2 lower than the top surface t1 of Wc. Reference numeral 1 indicates a plug according to an embodiment of the present invention inserted into the ring of the annular body W, and the circumferential surface 11 of the plug 1 has an outer circumference set to an outer diameter that can come into contact with the top surface t1 of the convex portion Wc. A plurality of projecting portions indicated as 12 are formed on the circumferential surface along the longitudinal direction. The projecting portions 12 are respectively formed at positions on the circumferential surface facing the plurality of recesses Wd.
Although it has a height that allows it to come into contact with the lower surface u of Wd,
Its width is narrower than the entire width of the recess Wd.

Since the embodiment plug 1 has the above shape,
The peripheral surface 11 maintains non-contact with the top surface t2 of the multiple tooth profile Ws.

The plug 1 is similar to the conventional plug 1' in that the periphery of the tip end face is chamfered c.

The outer periphery of the circumferential surface 11 can be brought into contact with the top surface t1 of the convex portion Wc, and the height of the overhanging portion 12 is set to the concave portion Wd.
Although it is expressed as being able to come into contact with the bottom surface of The same or slightly larger diameter (0.10 to 0.20% larger than the inner diameter at room temperature)...This point means that it is formed as disclosed in the invention of JP-A-58-37124. However, with such dimensions, the plug 1 can be easily pulled out from within the ring of the annular body W after hardening.

(Function of the invention) The present invention increases the length of the circular arc portion that can come into contact with the inner peripheral wall of the annular body, and increases the number of points that can come into contact with the inner peripheral wall in the inner peripheral direction, so the rapid cooling and quenching It has the effect of regulating the shrinkage strain uniformly over the entire inner circumference direction.

(Effect of the invention) The plug according to the invention is used for quenching and cooling of an annular body in which the inner peripheral wall has intermittent recesses and protrusions, and between which multiple teeth are formed with a top surface lower than the top surface of the protrusions. By doing so, the annular body can be hardened to a precise predetermined inner diameter over the entire circumferential direction, and is therefore used as a plug that can produce remarkable effects.

[Brief explanation of drawings]

Fig. 1 is a partially sectional plan view showing the plug according to the present invention inserted into the ring of the annular body, and Fig. 2 a and b show the rapid cooling and cooling of the annular body in the cooling zone.
FIG. 2 is a partially sectional front view showing a state of hardening. W... Annular body, Wc... Convex part, Wd... Concave part,
Ws...Tooth profile, t1...Top surface of convex portion, t2...Top surface of tooth profile, u...Bottom surface of concave portion, 1...Plug, 1
1... Surrounding surface, 12... Overhanging part.

Claims (1)

[Scope of utility model registration request] Insert into the annular body ring when subjecting to restraint hardening a heated annular body that has intermittent recesses and protrusions on the inner circumferential wall, and between which multiple tooth profiles with a top surface lower than the top surface of the convex parts are formed. A plug for quenching and cooling an annular body, characterized in that the plug is formed with an overhanging part that can come into contact with the bottom surface of the recessed part along the longitudinal direction on a peripheral surface of an outer diameter that can come into contact with the convex part.