JP5589710B2 - Heat treatment deformation correction device for annular workpiece - Google Patents

Description

  The present invention relates to a heat treatment deformation correcting device for correcting the shape of a circular workpiece during heat treatment.

In general, steel annular workpieces are subject to martensitic transformation expansion during heat treatment, and therefore the roundness and flatness are likely to decrease. An annular workpiece having reduced roundness and flatness requires a machining allowance for polishing work, which may lead to an increase in cost.
Several proposals have been made for heat treatment straightening devices for annular workpieces. For example, Patent Document 1 discloses that a circular shape is obtained by correcting the outer diameter of an annular workpiece by constraining the inner and outer diameters of the annular workpiece during quenching. The degree is improved. Moreover, for example, Patent Document 2 improves the flatness by correcting the warpage in the axial direction of the annular workpiece by restraining the annular workpiece during quenching from the axial direction.

Japanese Patent No. 3586888 JP 2009-19731 A

However, although the circular work formed by the heat treatment straightening device of Patent Document 1 is improved in roundness, it is likely to be warped in the axial direction and requires a polishing operation for improving flatness.
Moreover, although the circular workpiece | work formed with the heat processing correction apparatus of patent document 2 improves flatness, roundness is easy to fall, and the grinding | polishing operation | work for improving roundness is required.
As described above, the heat treatment straightening devices of Patent Documents 1 and 2 cannot improve the roundness and flatness of the annular workpiece and correct it, and a polishing operation is required, so the cost increase cannot be eliminated. .

  Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and can correct the circular work during heat treatment by improving the roundness and flatness, and can be taken by polishing work. An object of the present invention is to provide a heat treatment deformation correcting device for an annular workpiece capable of reducing cost by reducing cost.

In order to achieve the above object, a heat treatment deformation correction device for an annular workpiece according to the present invention is a heat treatment deformation correction device for correcting the shape of a circular workpiece with martensitic transformation expansion at the time of heat treatment, Roundness correction that is accommodated in a correction space formed in a cylindrical shape of a correction jig and corrects the circularity by abutting the outer peripheral surface of the annular workpiece on the inner wall of the correction jig that defines the correction space. A flatness correction surface that abuts against the end surface of the annular workpiece and corrects the flatness, and the annular workpiece accommodated in the correction space when the heat treatment is completed is formed in the correction space. A knockout jig that pushes out from an opening provided in a lower part is provided, and the correction jig includes the correction space having an inner peripheral surface as the roundness correction surface, and a jig space containing the knockout jig. Continuously formed A plurality of correction protrusions protruding radially inward are formed at predetermined intervals in the circumferential direction over the entire inner wall between the correction space and the jig space, and the correction of the plurality of correction protrusions is performed. The surface facing the space is the flat correction surface, and the knockout jig is provided with a plurality of extrusion protrusions protruding between the plurality of correction protrusions protruding at a predetermined interval in the circumferential direction of the jig body. When the knockout jig moves to the correction space side, the plurality of push-out protrusions are directed to the end surface of the annular work and toward the opening. A pressing force was applied.

  According to the heat treatment deformation correction device for an annular workpiece according to the present invention, the roundness correction surface of the correction jig abuts on the outer peripheral surface of the annular workpiece during heat treatment to correct the outer shape of the annular workpiece. The roundness is improved as a circular shape. Further, the flatness correction surface of the correction jig abuts on the end surface of the annular work during heat treatment to correct, thereby reducing the warpage in the axial direction of the annular work and improving the flatness. Therefore, according to the present invention, the circular workpiece during the heat treatment can be corrected by improving the roundness and flatness, so that the machining allowance by the polishing work after the heat treatment can be reduced and the cost can be reduced. .

It is a disassembled perspective view which shows 1st Embodiment of the heat processing deformation correction apparatus of the cyclic | annular workpiece | work which concerns on this invention. It is sectional drawing which shows the heat processing deformation correction apparatus which is performing deformation correction of the cyclic | annular workpiece. It is the figure which showed the correction jig which comprises the heat processing deformation correction apparatus of this invention by planar view. It is the figure which showed the correction jig of a shape different from FIG. 3 by planar view. It is a disassembled perspective view which shows 1st Embodiment of the heat processing deformation correction apparatus of the cyclic | annular workpiece | work which concerns on this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail with reference to the drawings.
FIG. 1 is an exploded view of the heat treatment deformation correcting device 2 of the first embodiment for correcting the annular workpiece 1 during heat treatment. FIG. 2 shows the heat treatment deformation correcting device 2 in the annular work during heat treatment. 1 shows a state where 1 is corrected.

The annular workpiece 1 is a steel annular member, and as shown in FIG. 2, an enlarged annular portion 3 that protrudes radially outward is formed on one end side in the axial direction. And the outer peripheral surface which faces the radial direction outward of the diameter-enlarged annular portion 3 is the outer peripheral surface 3a to be corrected of the annular workpiece 1, and the end surface of the annular workpiece 1 on one end side where the enlarged-diameter annular portion 3 is formed is the annular workpiece. 1 to be corrected end face 3b.
As shown in FIG. 1, the heat treatment deformation correction device 2 includes a correction jig 4, a centering jig 5, and a knockout jig 6.

As shown in FIG. 1, the correction jig 4 is provided with a cylindrical first space 7 for accommodating the annular workpiece 1 on one end side in the axial direction, and a centering jig 5 and a knockout jig on the other end side in the axial direction. And a plurality of correction protrusions 9 projecting radially inward are formed in the entire inner circumference between the first space 7 and the second space 8. Has been.
As shown in FIG. 2, a perfect circular inner peripheral surface 10 is formed on one end side in the axial direction of the correction jig 4 provided with the first space 7. The to-be-corrected outer peripheral surface 3a of the expanding annular workpiece 1 comes into contact. Hereinafter, the inner peripheral surface 10 of the correction jig 4 is referred to as a roundness correction surface 10.

As shown in FIG. 3, the plurality of correction protrusions 9 extend in the circumferential direction with a predetermined length (angle α1), and a predetermined interval (angle β1) between adjacent correction protrusions 9 and 9. Are formed over the entire circumference.
To the lower surface 11 of these correction protrusions 9, the end face 3b to be corrected of the annular workpiece 1 that expands during quenching abuts. Hereinafter, the lower surface 11 of the correction protrusion 9 is referred to as a flatness correction surface 11.

As shown in FIG. 1, the centering jig 5 includes a large-diameter portion 12 formed in a polygonal column shape having a size that can be arranged in the annular work 1 accommodated in the first space 7, and one end of the large-diameter portion 12. And a shaft portion 13 that protrudes coaxially.
As shown in FIG. 1, the knockout jig 6 has a plurality of pushing projections 14 projecting from the outer periphery of a polygonal columnar jig body 15, and a shaft portion 13 of the centering jig 5 at an axial center position. An insertion hole 17 through which can be inserted is formed.

Then, the annular work 1 is accommodated in the first space 7 of the correction jig 4, the large-diameter portion 12 of the centering jig 5 is disposed in the annular work 1, and the insertion hole is formed in the shaft portion 13 of the centering jig 5. When the knockout jig 6 is disposed through the 17, the plurality of extrusion protrusions 14 enter the recesses 16 between the correction protrusions 9 of the correction jig 4, and the lower surfaces of the extrusion protrusions 14 are It contacts with the to-be-corrected end surface 3b of the annular workpiece 1.
The outer peripheral surface of the annular workpiece of the present invention corresponds to the corrected outer peripheral surface 3a, the end surface of the annular workpiece of the present invention corresponds to the corrected end surface 3b, and the correction space of the present invention corresponds to the first space 7. The jig space of the present invention corresponds to the second space 8.

Next, the heat treatment correction procedure of the annular workpiece 1 using the heat treatment deformation correction device 2 of the present embodiment and the operation of discharging the annular workpiece 1 from the heat treatment deformation correction device 2 after the heat treatment will be described with reference to FIG.
First, the correction jig 4 is placed on a base (not shown) in a state where the annular work 1 is accommodated in the first space 7. At this time, the to-be-corrected outer peripheral surface 3a of the annular work 1 accommodated in the first space 7 is opposed to the perfect circularity straightening face 10 of the correcting jig 4, and the to-be-corrected end face 3b of the annular work 1 is The flatness correction surfaces 11 of the plurality of correction protrusions 9 of the correction jig 4 are opposed to each other.

Next, the centering jig 5 is arranged in the correction jig 4 from the second space 8 side so that the large-diameter portion 12 is positioned in the annular work 1 accommodated in the first space 7. The large diameter portion 12 located in the annular workpiece 1 restricts the annular workpiece 1 from moving in the radial direction.
Next, the knockout jig 6 is disposed in the second space 8 by inserting the insertion hole 15 through the shaft portion 13 of the centering jig 5. At this time, the plurality of extrusion projections 14 of the knockout jig 6 enter the recesses 16 between the correction projections 9 of the correction jig 4, and the lower surface of each extrusion projection 14 is the corrected end surface 3 b of the annular workpiece 1. Abut.

Next, a heating process is performed for a predetermined time on the annular workpiece 1 accommodated in the heat treatment deformation correction device 2 by a heating means (not shown).
Next, the annular work 1 is quenched by performing a cooling process for a predetermined time on the annular work 1 accommodated in the heat treatment deformation correcting device 2 by a cooling means (not shown).
On the other hand, the circular workpiece 1 after the heat treatment is bonded to the outer peripheral surface 3a to be corrected and the roundness correction surface 10 of the correction jig 4 due to the martensitic transformation expansion, so that the corrected end surface 3b of the annular workpiece 1 and the correction jig 4 The flatness correction surfaces 11 of the plurality of correction protrusions 9 are stuck.

In this case, first, the correction jig 4 is moved to an upper position with respect to the base. Next, an impact is applied to the knockout jig 6 to move the knockout jig 6 toward the first space 7 in the correction shaft 4.
When the knockout jig 6 moves to the first space 7 side, the plurality of push-out projections 14 of the knockout jig 6 exerts a pressing force on the corrected end surface 3b of the annular workpiece 1, and this pressing force causes the outer periphery to be corrected. Since the surface 3 a and the roundness correction surface 10 are separated from each other, and the to-be-corrected end surface 3 b and the flatness correction surface 11 are separated from each other, the annular work 1 accommodated in the first space 7 is an opening provided in a lower portion of the first space 7. It is extruded from the part 7a to the outside (on the base).

Next, the effect of this embodiment is demonstrated.
In the heat treatment deformation correction device 2 of the present embodiment, the circular shape correction surface 10 of the circular shape of the correction jig 4 is in contact with the outer peripheral surface 3a to be corrected of the circular workpiece 1 at the time of heat treatment to correct the circular shape. The roundness is improved by setting the outer shape of the work 1 as a perfect circle. Further, the flatness correction surfaces 11 of the plurality of correction protrusions 9 of the correction jig 4 are in contact with the entire circumference of the end surface 3b of the circular workpiece 1 during heat treatment to correct it, thereby correcting the circular workpiece 1. The flatness is improved by reducing the warpage in the axial direction. As described above, the heat treatment deformation correcting device 2 of the present embodiment can correct the annular work 1 during heat treatment with improved roundness and flatness, thereby reducing the allowance for polishing work after heat treatment. In addition, the cost can be reduced.

Further, since the roundness correction surface 10 and the flatness correction surface 11 are formed integrally with the correction jig 4, the number of parts of the heat treatment deformation correction device 2 can be reduced, and the heat treatment deformation correction device 2 is manufactured. Cost can be reduced.
Further, the annular work 1 after the heat treatment has the outer peripheral surface 3a to be bonded to the roundness correction surface 10 of the correction jig 4 and the corrected end surface 3b having a plurality of correction protrusions of the correction jig 4 due to martensitic transformation expansion. Although it will be in the state stuck to the flatness correction surface 11 of the part 9, only the knockout jig 6 is moved to the 1st space 7 side which accommodates the cyclic | annular workpiece | work 1, and several extrusion of the knockout jig 6 is carried out. The protruding portion 14 applies a pressing force to the corrected end surface 3b of the annular workpiece 1, and the pressing outer peripheral surface 3a and the roundness correcting surface 10 are separated by this pressing force, and the corrected end surface 3b and the flatness correcting surface 11 are formed. Since it is cut off, the annular work 1 after the heat treatment can be easily pushed out from the straightening jig 4.

In addition, the plurality of extruded protrusions 14 of the knockout jig 6 abut on the corrected end surface 3b of the annular workpiece 1 while entering the recess 16 provided between the adjacent correction protrusions 9 and 9 of the correction jig 4. Since the pushing force is applied to the annular work 1 without interfering with the straightening projections 9 and discharged from the straightening jig 4, the push-out mechanism of the annular work 1 can be simplified.
Here, the area where the extruded protrusion 14 of the knockout jig 6 abuts on the end face 3b of the annular work 1 is such that the annular work 1 stuck to the correction jig 4 by martensitic transformation expansion is discharged from the correction jig 4. Therefore, the area is set to have a strength that can sufficiently withstand the extrusion force required.

  Further, the plurality of correction protrusions 9 extending at a predetermined length (angle α1) in the circumferential direction shown in FIG. 3 is about the entire area of the end surface 3b to be corrected of the annular workpiece 1 in plan view. Although it is designed to correct by abutting with an area of 50%, for example, as shown in FIG. 4, the correction protrusion 17 (angle α2) having a longer circumferential length than the correction protrusion 9 shown in FIG. , Α3: α1 <α2 <α3), and the recesses 18 between the adjacent correction protrusions 17 and 17 are set to a circumferential interval shorter than the recesses 16 shown in FIG. 3 (angle β2: β2 <β1), If it is designed so as to make contact with and correct in an area of about 70% with respect to the total area of the to-be-corrected end surface 3b of the annular workpiece 1, the flatness of the annular workpiece 1 during heat treatment can be further improved.

Next, FIG. 5 shows a heat treatment deformation correcting device of the second embodiment.
In the heat treatment deformation correction device 2 of the first embodiment shown in FIGS. 1 to 4, the roundness correction surface 10 and the flatness correction surface 11 are formed by an integrated correction jig 4. The heat treatment deformation straightening apparatus includes a straightening jig 22 having a roundness straightening unit 20 and a flatness straightening unit 21 that are independently driven. In addition, the correction jig | tool 22 of this embodiment shall accommodate the centering jig | tool 5 and the knockout jig | tool 6 which were shown in 1st Embodiment.

The roundness correcting unit 20 is an annular member, and is arranged so as to be movable up and down toward the base 24 on which the annular workpiece 23 is placed by the operation of an elevating drive device (not shown). The inner peripheral surface of the roundness correcting portion 20 is a roundness correcting surface 20a, and the outer peripheral surface 23a to be corrected of the annular workpiece 23 that expands during quenching comes into contact with and is corrected.
Further, the flatness correcting unit 21 is disposed so as to be movable up and down toward the base 24 by the operation of a lifting drive device (not shown) different from the lifting drive device that lifts and lowers the roundness correcting unit 20. The flatness correction portion 21 is provided with a flatness correction surface 21a, and the flatness correction surface 21a is in contact with the corrected end surface 23b of the annular workpiece 23 that expands during quenching to be corrected. .

  According to the heat treatment deformation correcting device of the present embodiment, the roundness correction surface 20a of the roundness correction unit 20 is in contact with the to-be-corrected outer peripheral surface 23a of the annular workpiece 23 at the time of heat treatment, thereby correcting the annular workpiece 23. The roundness is improved by making the outer shape of the round shape a perfect circle. In addition, the flatness correction surface 21a of the flatness correction unit 21 is in contact with the corrected end surface 23b of the annular workpiece 23 at the time of heat treatment to correct the flatness by reducing the axial warpage of the annular workpiece 1. Improve. As described above, according to the present embodiment, the annular work 23 at the time of the heat treatment can be corrected by improving the roundness and the flatness, so that the machining allowance by the polishing work after the heat treatment is reduced and the cost is reduced. be able to.

  In the heat treatment deformation correction device of this embodiment, the roundness correction unit 20 and the flatness correction unit 21 are independently driven, so that the roundness correction and flatness correction timing of the annular workpiece 23 can be arbitrarily set. It can be set, and by adjusting the position of the flatness correction unit 21 in the axial direction with respect to the roundness correction unit 20, a plurality of types of different width dimensions can be used without changing to another shape correction jig. Roundness correction and flatness correction of the annular workpiece 23 can be performed.

  Table 1 shows the roundness of a circular workpiece (described as outer diameter correction + flat surface correction) subjected to heat treatment with the heat treatment deformation correction device according to the present invention, changes in warpage (axial warpage), and correction by a conventional method. It is the experimental result which compared the roundness of the cyclic | annular workpiece | work (only outer diameter correction | amendment, described only as plane correction), and the change of the curvature | sledge. It should be noted that the outer diameter of the annular workpiece tested (the outermost diameter of the expanded annular portion 3) is 80 mm, the inner diameter is 68 mm, and the width is 13 mm.

  As is apparent from the experimental results in Table 1, the circular ring subjected to heat treatment correction by the heat treatment deformation correcting device according to the present invention has a roundness of 51 μm, a warp of 75 μm, and improved roundness and flatness. Correction. On the other hand, the circular ring that has been heat-treated by the conventional method using only the outer diameter correction has improved roundness (62 μm) but reduced flatness (warp of 200 μm). In addition, an annular ring subjected to heat treatment correction by a conventional method using only flattening improves the warpage (68 μm) but decreases the roundness (roundness is 164 μm).

DESCRIPTION OF SYMBOLS 1 ... Annular work, 2 ... Heat treatment deformation correction device, 3 ... Diameter expansion annular part, 3a ... Outer peripheral surface to be corrected, 3b ... End surface to be corrected, 4 ... Correction jig, 5 ... Centering jig, 6 ... Knockout jig 7 ... 1st space, 7a ... Opening part, 8 ... 2nd space, 9 ... Correction protrusion part, 10 ... Roundness correction surface, 11 ... Flatness correction surface, 12 ... Large diameter part, 13 ... Shaft part, DESCRIPTION OF SYMBOLS 14 ... Extrusion protrusion part, 15 ... Jig body, 16 ... Recessed part, 17 ... Insertion hole, 20 ... Roundness correction part, 21 ... Flatness correction part, 22 ... Correction jig, 23 ... Circular workpiece, 23a ... Cover Straightening outer peripheral surface, 23b ... End face to be straightened, 24 ... Base

Claims (1)

A heat treatment deformation correction device for correcting the shape of a circular workpiece with martensitic transformation expansion during heat treatment,
The annular workpiece is accommodated in a correction space formed in a cylindrical shape of a correction jig,
On the inner wall of the correction jig that defines the correction space, a roundness correction surface that abuts on the outer peripheral surface of the annular workpiece and corrects the roundness, and a flatness that abuts on the end surface of the annular workpiece. The flatness correction surface to be corrected is formed ,
A knockout jig that pushes the annular work housed in the correction space to the outside through an opening provided in a lower portion of the correction space when heat treatment is completed;
The straightening jig continuously forms the straightening space having an inner peripheral surface as the roundness straightening surface and a jig space containing the knockout jig, and the straightening space between the straightening space and the jig space. A plurality of correction protrusions protruding inward in the radial direction are formed across the entire inner wall in the circumferential direction with a predetermined interval therebetween, and a surface facing the correction space of the plurality of correction protrusions is defined as the flat correction surface, In the knockout jig, a plurality of extruded protrusions protruding at a predetermined interval in the circumferential direction of the jig main body enter recesses provided between the plurality of correction protrusions, respectively, and the end surface of the annular workpiece When the knockout jig moves to the correction space side, the plurality of pushing projections act on the end surface of the annular workpiece to exert a pressing force toward the opening. An annular word Heat treatment deformation correction device.

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