JPS636204Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an apparatus for straightening the outer diameter of an annular article, and particularly to a press quench for an annular article that undergoes coreless quenching.

Generally, when hardening an annular body, distortion due to transformation stress during heating and cooling and distortion due to thermal stress influence each other, causing elliptical deformation and warp deformation in the annular article. If this deformation is large, the number of man-hours and machining allowance for the subsequent polishing process will increase, so it is necessary to suppress the amount of deformation to a minimum. For this reason, conventionally, as shown in the quenching curve in Figure 1, the annular article is removed using a collet or a split mold in the final stage (transformation shrinkage stage) during quenching and cooling by taking advantage of the dimensional changes caused by expansion and contraction of the steel. A method of constraining the diameter, suppressing the amount of deformation, and forcibly securing predetermined roundness and cylindricity has been considered.

The present applicant has already implemented the above-mentioned method in an apparatus for correcting the outer diameter of annular articles (Utility Model Registration No. 1356069), and has achieved considerable results in reducing elliptical deformation and warp deformation of annular articles. As shown in FIG. 2, the apparatus for correcting the outer diameter of an annular article is composed of a first mold a that can be raised and lowered, and a plurality of split molds 1 that are installed to be contractible in the radial direction within the first mold a. The second type b
and a surface plate c provided with a coolant supply path,
The first mold a is screwed into an upper press head 3 having a coolant discharge passage 2, and a lower press head which has a tapered part on the inner periphery which abuts the tapered part of the split mold 1. 4 and a plurality of split molds 1 is attached to the tapered inner surface of the lower press head 4 via an attachment slide key 5. When the first mold a is lowered, the tapered part of the lower press head 4 presses the split mold 1 radially inward, and at the same time, the split mold 1 is clamped between the surface of the surface plate c and the lower end surface of the upper press head 3. The inner circumferential surface of the split mold 1 forms one continuous inner circumferential surface for constraining the outer diameter of the annular article 6 during cooling.

However, when trying to process a wide variety of model numbers with the outer diameter straightening device for annular articles having the above configuration, the processing is very time-consuming and the split mold 1 becomes expensive.
However, it was necessary to prepare split molds 1 for each size of the annular article 6. In addition, the split mold 1 is large and heavy, making setup change work dangerous and, moreover, the work is complicated.

In order to improve the above-mentioned problems when trying to process a wide variety of model numbers, this invention forms a large number of fitting holes in each of a plurality of split molds, and a large number of outer diameters that are fitted into the fitting holes. A second mold is formed by the restraint plate, and an inner circumferential surface for restraint having predetermined roundness and cylindricity is formed by the envelope surface of the inner diameter side end surface of the outer diameter restraint plate. This device is an apparatus for correcting the outer diameter of an annular article, and the structure of this invention will be described below with reference to the embodiment shown in the drawings.

In FIG. 3, the device according to this invention consists of a first mold A supported so as to be able to rise and fall, and a plurality of split molds B.
and a large number of outer diameter restraining plates 7 fitted into this split mold B.
It is composed of a second mold C formed by a mold C and a surface plate D.

The first mold A consists of an upper press head 9 having a coolant outlet 8 and a lower press head 11 connected to the upper press head 9 via an annular joint member 10. The lower press head 11 is an annular body having a tapered hole whose diameter decreases upward.
2, the annular joint member 10 is arranged so that the axial distance between the upper press head 9 and the upper press head 9 can be arbitrarily adjusted.
is connected to. This makes it possible to adjust the diameter dimension formed by the split mold B, which will be described later. Numeral 13 is a lock nut for locking the axial position of the lower press head 11, and numeral 14 is a keyway carved at a plurality of locations on the inner periphery of the tapered hole of the lower press head 11.

The above-mentioned split mold B is divided into, for example, 6 to 12 pieces in total, and each piece is installed so as to be slidable in the axial direction by an attachment slide key 15 fixed to the tapered surface on the outer periphery. Furthermore, as shown in FIG. 4, each of the split molds B has a plurality of small pieces 16, 17 arranged at equal intervals J in the circumferential direction, and an upper connecting member 18 for connecting and fixing these pieces. A large number of rectangular fitting holes 2 are formed by the small pieces 16, 17 and both the connecting members 18, 19.
form 0.

In addition, the above-mentioned mounting slide key 15 and key groove 14
The cross-sectional shape is approximately V-shaped (dovetail groove shape) to prevent the split mold B from detaching inward in the radial direction, and a long groove 2 is formed on the top surface of the mounting slide key 15.
A lower press head 1 is formed in this long groove 21.
A stopper pin 22 embedded in the mold 1 is fitted to prevent the split mold B from falling downward.

Reference numeral 7 denotes the aforementioned outer diameter restraining plate having a substantially T-shaped body consisting of a shaft portion 23 and a protruding portion 24, and by inserting the shaft portion 23 into the fitting hole 20 of the split mold B, the split mold B A large number of protrusions 24 are removably fitted into the
A second mold C is formed by. Then, the upper press head 9 reaches the lower end, and the annular joint member 10
The split mold B is clamped and fixed in a vertical state by the open end face of the open end face and the surface plate D, and an envelope circle of a predetermined diameter is formed by the inner diameter side end faces of a large number of outer diameter restraining plates 7 finished to a predetermined size. is formed, thereby forming a restraining inner circumferential surface that has a predetermined roundness and cylindricity and is close to a continuous state (see the left half of FIG. 3).

The surface plate D has a coolant supply path 25 in the center,
The lower end of the upper press head 9 abuts against the connecting member 19 on the lower side of the split mold B. 26 is an annular article placed on the surface plate D, and 27 is a coolant rectifying plate provided above the supply path 25.

Next, the operation of the device according to this invention will be explained as follows. First, when the first type A is at the rising end, the stopper pin 22 is attached to the mounting slide key 15.
Insert the outer diameter restraining plate 7 that matches the model number (shape and dimensions) of the annular article 26 into the fitting groove 20 while the plurality of split molds B are not restrained. form a type C.

Next, the axial position of the lower press head 11 is determined at the lower end of the first mold A, and the diameter dimension formed by the split mold B is set to a predetermined value.

After the above setup work is completed, the heated annular article 26 is fed onto the surface plate D. Subsequently, when the first mold A is lowered, the lower connecting member 19 comes into contact with the surface plate D, and the diameter of the split mold B is reduced along the tapered hole by the weight of the first mold A, resulting in a large number of The inner diameter side end surface of the outer diameter restraining plate 7 holds the outer periphery of the heated annular article 26.

Here, the first mold A is allowed to descend only by its own weight until the annular article 26 is cooled to around point Ms shown in FIG. 1 and contracts. In other words, no strong restraining force is applied to the outer diameter of the annular article 26. And this
The upper press head 9 is pressed with a predetermined pressure near the Ms point, and the split mold B is pressed between the annular joint member 10 and the surface plate D at the lower end to fix it in a vertical state, and An enveloping circle of a predetermined diameter is formed on the inner diameter side end surface of the restraint plate 7, thereby forming an inner circumferential surface for restraint that has a predetermined roundness and cylindricity and is close to one continuous state.

Then, when the annular article 26 starts to expand,
The inner circumferential surface for restraint corrects (restricts) the outer diameter of the annular article 26, the press quench is completed, the jetting of the coolant stops, and the upper press head 9 finishes pressing and rises.

As explained above, this invention involves providing fitting holes in the circumferential direction of the inner circumferential surface of a plurality of split molds installed so as to be slidable in the axial direction in a first mold that is supported so as to be able to move up and down. A number of outer diameter restraining plates are removably fitted into the holes to form a second mold, and a first mold is formed.
At the same time, the split mold is pressed in the radial direction at the descending end of the mold, and at the same time, the split mold is clamped in the axial direction between the first mold and the surface of the surface plate to fix it in a vertical state. The outer diameter of an annular article characterized in that the envelope surface of the inner diameter side end surface of the plate forms an inner circumferential surface for restraint that has a predetermined roundness and cylindricity and is close to a continuous state. The straightening device is capable of highly accurate outer diameter straightening of an annular article while being heated and rapidly cooled. In addition, since a large number of outer diameter restraining plates are formed by removably fitting the second mold into a plurality of split molds,
When changing setups, there is no need to prepare multiple types of expensive split molds, and there is no need to replace the heavy split molds themselves depending on the size of the annular article, and the outer diameter can be restricted depending on the size of the annular article. It is only necessary to replace the plate, and therefore the setup change work can be carried out quickly and safely without any danger.

Furthermore, since a large number of outer diameter restraining plates can be turned at once using a jig into which each shaft portion is fitted, the cost is much lower than that of split molds.

[Brief explanation of drawings]

FIG. 1 shows the quenching curve of steel, and FIG. 2 shows a sectional view of an apparatus for straightening the outer diameter of an annular article previously proposed by the inventor. 3 and 4 show an embodiment of the apparatus according to the present invention, and FIG. 3 is a front sectional view thereof, and on the left side of the center line, the outer diameter of the annular article is corrected at the descending end of the press head. The right side of the center line shows the state where the press head is in the middle of rising and the split mold slides and expands in diameter. Further, FIG. 4 is a diagram showing a cross section taken along the line X--X in FIG. 3. 7... Outer diameter restraint plate, 8... Coolant discharge passage,
20... Fitting hole, 25... Coolant supply path, 26
...Circular article, A...First mold, B...Split mold, C
...Second mold, D...Surface plate.

Claims (1)

[Scope of utility model registration request] A first mold having a tapered hole having a diameter reduced upward from the lower opening and a coolant discharge passage above, each having a tapered surface along the tapered hole, and installed so as to be slidable in the axial direction. , a plurality of split molds having fitting holes in the circumferential direction of the inner circumferential surface formed by each of the split molds, and a plurality of outer diameter restraining plates removably fitted into the fitting holes. and a surface plate which is installed below the plurality of split molds and has a coolant supply path, and supports the first mold so as to be able to rise and fall, and when lowered, the split molds are moved radially inward through a tapered hole. At the same time as pressing, the split mold is clamped in the axial direction between the surface plate surface and the first mold to fix it in a vertical state, and a predetermined trueness is held by the envelope surface of the inner diameter side end surface of the plurality of outer diameter restraining plates. An apparatus for correcting the outer diameter of an annular article, characterized in that an inner circumferential surface for restraint is formed with circularity and cylindricity.