JP2008006533A - Drawing tool for heat drawing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing tool for heat drawing easily and quickly drawing a ring member immediately after induction-heating and expanding it, from a shaft. <P>SOLUTION: This drawing tool 10 for the heat drawing is used when an inner lace 40 is drawn from the shaft 30 by surrounding the inner lace 40, which is fitted in the outer circumferential face 30a of a tubular or columnar shaft 30, with a ringed induction-heating coil, induction-heating it and expanding it. The drawing tool 10 for the heat drawing is provided with a ringed spacer 12 formed with a step in its internal circumferential face (almost half of the internal circumferential face is narrowed inward), two claws having L-shaped whole shape, ringed claw holder 14 formed with two recessed portions 14a where the claws are fitted in and retained, a claw pushing ring 18 pushingly fixing the claws retained to the respective recessed portions 14a of the claw holder 14, and a drawing claw 20 to be attached to the induction-heating coil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a ring-shaped member (for example, an inner ring of a bearing) fitted in an outer peripheral surface of a columnar (or cylindrical) shaft is surrounded by an induction heating coil and is expanded by induction heating to expand the ring-shaped member from the shaft. The present invention relates to a drawing jig for tempering that is used when pulling out steel.

For example, the inner ring may be pulled out from a shaft on which the inner ring (inner race) of the bearing is shrink-fitted. In this case, the inner ring is pulled out from the shaft by induction heating and expanding (see, for example, Patent Document 1). When the inner ring is pulled out from the shaft in an inflated state by induction heating, the inner ring is heated due to heating, and the inner ring is slightly expanded. Therefore, it is necessary to quickly pull out the inner ring.
Japanese Patent Publication No. 30-7337

  In view of the above circumstances, an object of the present invention is to provide a drawing jig for tempering that can be easily and quickly pulled out from a shaft immediately after the ring-shaped member is expanded by induction heating.

In order to achieve the above-described object, the drawing jig according to the present invention includes a ring-shaped member fitted on an outer peripheral surface of a shaft, surrounded by an induction heating coil and expanded by induction heating to expand the ring shape. In the drawing jig for baking used when pulling out members,
(1) A claw that comes into contact with the convex portion formed on the outer peripheral surface of the ring-shaped member from the upstream side in the pulling direction for pulling out the ring-shaped member;
(2) a claw holder inserted into the shaft, in which a recess for holding the claw is formed;
(3) a claw presser ring that is fitted into the outer peripheral surface of the claw holder to press and fix the claw held in the recess of the claw holder;
(4) The induction heating is performed by extracting the ring-shaped member from the shaft together with the claw, the claw holder, and the claw holding ring by moving the claw holder from the upstream side to the downstream side in the drawing direction. The present invention is characterized in that a drawing claw attached to the coil is provided.

here,
(5) The shaft is formed with a ring portion that is thicker than the outer diameter of the shaft on the upstream side in the drawing direction than the convex portion of the ring-shaped member fitted in the longitudinal direction. Yes,
(6) provided with a spacer that contacts the ring portion from the downstream side in the pulling direction by being inserted into the shaft;
(7) The extraction claw is abutting on the spacer from the upstream side in the extraction direction,
(8) The claw holder may be in contact with the spacer from the downstream side in the pulling direction.

Also,
(9) You may provide the coil carriage which moves the said induction heating coil to the said extraction direction and its reverse direction.

further,
(10) The claw holding ring, the claw holder, and the spacer may be made of a thermally insulating material.

  In using the extraction jig for the present invention, first, before the ring-shaped member is surrounded by the induction heating coil (that is, the induction heating coil is inserted into the shaft), the nail holder is first inserted into the shaft (the spacer is inserted). If it is, insert the spacer first), and then hold the claw in the claw holder recess and abut the convex part of the ring-shaped member from the upstream side in the pulling direction. Press the nail and fix it. Thereafter, the induction heating coil is inserted into the shaft, the ring-shaped member is surrounded by the induction heating coil, and the extraction claw is arranged so that the claw holder can be moved in the extraction direction. Subsequently, the ring-shaped member is induction-heated by the induction heating coil. The ring-shaped member is expanded by this induction heating, and then the extraction claw is moved from the upstream side to the downstream side in the extraction direction with respect to the claw holder. By this movement, the ring-shaped member and the induction heating coil are pulled out from the shaft together with the claw, the claw holder, and the claw holding ring. That is, when the extraction jig for baking according to the present invention is used, the extraction jig for extraction is arranged at a position where the ring-shaped member is pulled out before the ring-shaped member is heated by the induction heating coil (prior to heating). In this state, the ring-shaped member is heated by the induction heating coil, and the ring-shaped member is pulled out from the shaft by moving the pulling claw in the pulling direction immediately after the ring-shaped member expands to a size that can be pulled out from the shaft. Therefore, immediately after the ring-shaped member is expanded by induction heating, it can be easily and quickly pulled out of the shaft.

  The present invention has been realized in a drawing jig for tempering that is used when the inner ring is heated and expanded from a shaft on which the inner ring is shrink-fitted and pulled out.

  With reference to FIG. 1 and FIG. 2, each member which comprises the drawing jig | tool for baking of this invention is demonstrated.

  FIG. 1 is an exploded perspective view showing each member constituting an example of a drawing jig for baking according to the present invention, (a) showing a spacer, (b) showing a claw holder, (c) Indicates a nail, (d) indicates a nail retainer ring, and (e) indicates a pull-out nail. FIG. 2 is a perspective view showing a state in which each member shown in FIG.

  In the drawing jig 10 for tempering, an inner race 40 (an example of a ring-shaped member according to the present invention, also referred to as an inner ring) fitted in an outer peripheral surface 30a of a cylindrical or columnar shaft 30 is ring-shaped. It is used when the inner race 40 is pulled out from the shaft 30 by being surrounded by an induction heating coil 50 (see FIG. 7 and the like), induction heated and expanded. At one end in the longitudinal direction of the shaft 30, an oil drain 32 (which is an example of a ring portion in the present invention) that prevents oil leakage from a bearing constituted by an inner race 40 or the like is formed. The outer diameter of the oil drainer 32 is larger than the outer diameter of the shaft 30. Further, the inner race 40 has a ring-shaped convex portion 40a formed on the outer peripheral surface of the inner portion (the inner portion from the oil drain 32 of the shaft 30) from one end in the longitudinal direction. The outer diameter of the convex portion 40a is larger (thicker) than the outer diameter of the inner race 40 other than the convex portion 40a. The inner race 40 has an inner diameter slightly smaller than the outer diameter of the shaft 30, and the inner race 40 is fitted and fixed to the shaft 30. Regarding this fitting, there is an “interference (the outer diameter of the shaft−the inner diameter of the inner race) / 2”, and the inner race 40 is strongly fitted to the shaft 30 by this “interference” at room temperature. . Moreover, although the shaft 30 seems to be floating, it is actually held by a vehicle body or the like at a portion not shown.

  The extraction jig 10 for a blanking is composed of a ring-shaped spacer 12 having a step formed on the inner peripheral surface (about half of the inner peripheral surface is narrowed inward), and two claws 16 having an overall L-shape. And a ring-shaped claw holder 14 formed with two recesses 14a in which these claws 16 are fitted and held, and a claw for pressing and fixing the claw 16 held in each of the recesses 14a of the claw holder 14 A presser ring 18 and a pulling claw 20 attached to the induction heating coil 50 are provided. The spacer 12 and the claw holder 14 may be integrally formed.

  The spacer 12 is appropriately designed according to the shape and size (size) of the oil drain 32 described above, and is inserted into the shaft 30 from the direction of the arrow A, whereby the drawing direction (the direction of the arrow B, From the downstream side in the direction opposite to the direction of arrow A), the oil drain 32 abuts on the downstream side surface in the drawing direction.

  The claw holder 14 has a shape in which a ring having a large outer diameter and a ring having a small outer diameter are integrated. The two recesses 14a described above are formed in a ring having a small outer diameter. The end face of the ring having a large outer diameter in the claw holder 14 comes into contact with the downstream side surface in the drawing direction of the spacer 12 from the downstream side in the drawing direction. The two concave portions 14a of the claw holder 14 are formed at positions (positions facing each other) that are 180 ° apart from each other at the central angle.

  The claw retainer ring 18 is fitted into the outer peripheral surface of a ring having a small outer diameter in the claw holder 14. That is, the inner diameter of the claw retainer ring 18 is substantially equal to the outer diameter of the ring having a smaller outer diameter in the claw holder 14. The outer diameter of the claw retainer ring 18 is equal to the outer diameter of the ring having a larger outer diameter in the claw holder 14. Similarly, the outer diameter of the spacer 12 is equal to the outer diameter of the claw retainer ring 18.

  The inner diameters of the spacer 12, the claw holder 14, and the claw retainer ring 18 are larger than the outer diameter of the convex portion 40 a of the inner race 40. The arrangement of the extraction claws 20 in the induction heating coil 50 will be described later. Further, the inner diameter and outer diameter of the spacer 12, the claw holder 14, and the claw holding ring 18 are appropriately set based on the outer diameter of the inner race 40 fitted into the shaft 30. The material of the spacer 12, the claw holder 14 and the claw retainer ring 18 has heat insulation (thermal insulation, extremely low thermal conductivity), arc resistance, electrical insulation, and low thermal expansion coefficient. . As an example of such a material, Beth Thermo F (trade name) manufactured by Nikko Kasei Co., Ltd. may be mentioned. The material of the claw 16 is SUS304 (JIS).

  The usage method of the drawing jig | tool 10 for baking is demonstrated with reference to FIGS. 3-12.

  FIG. 3 is a perspective view showing a state in which the spacer is fitted in the oil drain. FIG. 4 is a perspective view showing a state in which the claw holder is fitted in the oil drain following the spacer. FIG. 5 is a perspective view showing a state in which the claw is held in the concave portion of the claw holder fitted in the oil drainer. FIG. 6 is a perspective view showing a state in which the claw holding ring is fitted into the claw holder in order to fix the claw held in the recess of the claw holder. FIG. 7 is a perspective view showing a state immediately before the induction heating coil is inserted after the nail retainer ring is fitted. FIG. 8 is a perspective view showing a state in which the inner race is surrounded by the induction heating coil. FIG. 9 is a cross-sectional view showing a state in which the extraction claw is brought into contact with the spacer after the inner race is surrounded by the induction heating coil. FIG. 10 is a perspective view showing a state in which the extraction claw is slightly moved in the extraction direction. FIG. 11 is a cross-sectional view showing a state in which the extraction claw has been slightly moved in the extraction direction. FIG. 12 is a perspective view showing a state in which the inner race is pulled out from the shaft together with the drawing jig for baking.

  When pulling out the inner race 40, which is shrink-fitted on the shaft 30, from the shaft 30 using the drawing jig 10 for tempering, first, the spacer 12 is inserted into the shaft 30 from the direction of the arrow A, and one end surface of the oil drainer 32 is inserted. Are brought into contact with each other from the downstream side in the drawing direction (arrow B direction). Thereby, as shown in FIG. 3, the spacer 12 is fitted in the oil drain 32 (see also FIG. 9). Subsequently, the claw holder 14 is moved in the direction of arrow A and is brought into contact with the spacer 12 from the downstream side. As a result, as shown in FIG. 4, the claw holder 14 is fitted into the oil drain 32 on the upstream side in the arrow A direction (left side in FIG. 4) from the spacer 12 (see also FIG. 9).

  The claw holder 14 in the above state is rotated in the circumferential direction so that the concave portion 14a is aligned with the groove portion 32a (see FIG. 9) of the inner race 40 and the oil drain 32. In this state, the claw 16 is fitted into the recess 14a, and a part of the claw 16 is inserted into the groove 32a and held as shown in FIG. 5 (see also FIG. 9). The nail | claw 16 hold | maintained at the recessed part 14a contact | abuts to the convex-shaped part 40a of the inner race 40 from the upstream of the arrow B direction (drawing direction). In order to press and fix the claw 16 held in the recess 14a, as shown in FIG. 6, a claw presser ring 18 is fitted into the outer peripheral surface of the claw holder 14 where the recess 14a is formed. As a result, the claw 16 is fixed to the recess 14a, and the spacer 12, the claw holder 14, the claw 16, and the claw holding ring 18 are integrated. The outer diameters of the spacer 12, the claw holder 14, and the claw holding ring 18 are equal.

  After the spacer 12, the claw holder 14, the claw 16, and the claw retainer ring 18 are integrated as described above, the induction heating coil 50 is inserted into the shaft 30 and the inner race 40 is surrounded by the induction heating coil 50. When inserting the induction heating coil 50 into the shaft 30, a coil carriage 60 is used as shown in FIG. The coil carriage 60 is for moving the induction heating coil 50 in the drawing direction (arrow B direction) and the opposite direction (arrow A direction). The coil carriage 60 is moved in the direction of arrow A, and is stopped at a position where the induction heating coil 50 surrounds the inner race 40.

  The pulling claw 20 is fixed to the face plate 52A on the downstream side in the arrow A direction (upstream side in the arrow B direction) of the pair of face plates 52 so as to be orthogonal to the arrow A direction. The extraction claw 20 is a long and thin plate, and a long hole 20a (see FIG. 1 (e)) is formed at one end in the longitudinal direction. The extraction plate 20 is fixed to the face plate 52A by inserting and tightening bolts into the long holes 20a. When the induction heating coil 50 is inserted into the shaft 30 together with the pair of face plates 52, the pulling claws 20 are retracted to the same or more outer peripheral surface than the inner peripheral surface of the face plate 52A as shown in FIG. After the induction heating coil 50 stops at a position surrounding the inner race 40, the bolt inserted into the elongated hole 20a of the extraction claw 20 is loosened to move the extraction claw 20 to the inside of the inner peripheral surface of the face plate 52A. As shown in FIG. 9, one end portion in the longitudinal direction of the extraction claw 20 is brought into contact with the spacer 12 from the upstream side in the extraction direction (the right side of the paper surface of FIG. 9). The face plate 52A is formed with a groove (a groove having a width slightly larger than the width of the extraction claw 20) into which the extraction claw 20 enters. A stainless steel plate 54 for preventing wear of the face plate 52A due to the movement of the extraction pawl 20 is fixed to the bottom of the groove.

  As described above, the spacer 12, the claw holder 14, the claw 16, and the claw retainer ring 18 are integrated, and the inner race 40 is surrounded by the induction heating coil 50, and one end in the longitudinal direction of the extraction claw 20 is arranged in the extraction direction. In a state where the spacer 12 is brought into contact with the spacer 12 from the upstream side, AC power is supplied to the induction heating coil 50 to cause the inner race 40 to expand by induction heating. The inner race 40 is expanded to such an extent that it can be pulled out of the shaft 30, and the extraction pawl 20 is quickly moved in the direction of arrow B as shown in FIGS. Thereby, the extraction claw 20 pushes and moves the spacer 12 in the arrow B direction, and the claw holder 14, the claw 16, the claw holding ring 18 and the inner race 40 move together with the spacer 12 in the arrow B direction, as shown in FIG. Thus, the inner race 40 is pulled out from the shaft 30.

  As described above, the extraction jig 10 for tempering is disposed at a position where the inner race 40 is pulled out before the inner race 40 is induction-heated by the induction heating coil 50 (prior to heating). The inner race 40 is induction-heated by the induction heating coil 50, and the inner race 40 is easily pulled out from the shaft 30 by moving the pulling claw 20 in the pulling direction immediately after the inner race 40 expands to a size that can be pulled out from the shaft 30. . Accordingly, the inner race 40 can be easily and quickly pulled out from the shaft 30 immediately after the inner race 40 is expanded by induction heating.

It is a perspective view which decomposes | disassembles and shows each member which comprises an example of the drawing jig | tool for baking of this invention, (a) shows a spacer, (b) shows a nail | claw holder, (c) shows a nail | claw. , (D) shows a claw presser ring, and (e) shows a drawing claw. It is a perspective view which shows the state which inserted each member shown in FIG. It is a perspective view which shows the state which fitted the spacer in the oil drain. It is a perspective view which shows the state which inserted the nail | claw holder into the oil drain following the spacer. It is a perspective view which shows the state which hold | maintained the nail | claw in the recessed part of the nail | claw holder fitted by the oil drain. It is a perspective view which shows the state which fitted the nail | claw press ring in the nail | claw holder in order to fix the nail | claw hold | maintained at the recessed part of the nail | claw holder. It is a perspective view which shows the state just before inserting an induction heating coil, after a nail | claw presser ring is inserted. It is a perspective view which shows the state which surrounded the inner race with the induction heating coil. It is sectional drawing which shows the state which made the extraction nail | claw contact | abut the spacer after surrounding an inner race with the induction heating coil. It is a perspective view which shows the state which moved the extraction nail | claw a little in the extraction direction. It is sectional drawing which shows the state which moved the extraction nail | claw a little in the extraction direction. It is a perspective view which shows the state which pulled out the inner race with the extraction jig | tool for tempering from the axis | shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Extraction jig | tool 12 for tempering Spacer 14 Claw holder 16 Claw 18 Claw pressing ring 20 Extraction claw 30 Shaft 40 Inner race 50 Induction heating coil

Claims (4)

In a drawing jig for tempering used when pulling out the ring-shaped member from the shaft by surrounding the ring-shaped member fitted on the outer peripheral surface of the shaft with an induction heating coil and expanding by induction heating,
A claw that comes into contact with the convex portion formed on the outer peripheral surface of the ring-shaped member from the upstream side in the pulling direction for pulling out the ring-shaped member;
A claw holder inserted into the shaft, in which a recess for holding the claw is formed;
A claw presser ring that is fitted into the outer peripheral surface of the claw holder to press and fix the claw held in the recess of the claw holder;
The ring-shaped member is pulled out from the shaft together with the claw, the claw holder, and the claw holding ring by moving from the upstream side to the downstream side in the pulling direction from the claw holder, and is attached to the induction heating coil. An extraction jig for baking, comprising the extracted extraction claw. The shaft is formed with a ring portion thicker than the outer diameter of the shaft on the upstream side in the drawing direction than the convex portion of the ring-shaped member fitted in the longitudinal direction,
A spacer that contacts the ring portion from the downstream side in the pulling direction by being inserted into the shaft;
The extraction claw is abutting on the spacer from the upstream side in the extraction direction,
2. The extraction jig according to claim 1, wherein the claw holder comes into contact with the spacer from a downstream side in the extraction direction. The extraction jig according to claim 1 or 2, further comprising a coil carriage that moves the induction heating coil in the extraction direction and in the opposite direction. 4. The extraction jig according to claim 1, wherein the claw holding ring, the claw holder, and the spacer are made of a thermally insulating material.

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