JP5183109B2 - Tempering apparatus and tempering method - Google Patents

Description

  The present invention relates to a tempering apparatus and a tempering method for simultaneously tempering a constant velocity joint outer ring in which an outer peripheral surface of a stem portion and an inner peripheral surface of a mouse portion are quenched and hardened.

  For example, a columnar stem portion and a cylindrical mouse portion are formed on a constant velocity joint outer ring which is one of automobile parts. The outer peripheral surface of the stem portion and the inner peripheral surface of the mouse portion are tempered after being hardened by hardening. When the outer peripheral surface of the stem portion and the inner peripheral surface of the mouse portion are tempered, the outer peripheral surface and the inner peripheral surface are tempered separately because there is a difference in shape and area between the outer peripheral surface and the inner peripheral surface. That is, the inner peripheral surface is tempered after tempering the outer peripheral surface, or the outer peripheral surface is tempered after tempering the inner peripheral surface. Alternatively, the entire constant velocity joint outer ring (stem part, mouse part) is covered with a spiral coil, and the entire constant velocity joint outer ring is tempered.

  Since the outer peripheral surface and the inner peripheral surface are tempered separately as described above, the time required for tempering becomes longer, and the tempering operation takes time. In addition, it is important that the boundary between the mouse part and the stem part of the constant velocity joint outer ring is thick. In this case, the thick part is not easily heated, and the tempering temperature between the mouse part and the stem part is made closer. Is difficult. In addition, when the entire constant velocity joint outer ring is tempered with a spiral coil, the time required to raise the temperature of the entire constant velocity joint outer ring is longer than the above.

  In view of the above circumstances, the present invention provides a tempering device capable of tempering the outer peripheral surface and the inner peripheral surface of a constant velocity joint outer ring having a thick boundary portion between a mouse portion and a stem portion to a uniform temperature in a shorter time than before, and It aims to provide a tempering method.

In order to achieve the above object, a tempering apparatus of the present invention has a cylindrical stem portion having a hardened hardening layer whose outer peripheral surface is hardened and a hardened hardening layer whose inner peripheral surface is hardened by hardening. In the tempering device for tempering the outer peripheral surface and the inner peripheral surface of the constant velocity joint outer ring formed with a cylindrical mouse part,
(1) Surrounding the outer peripheral surface from above the stem portion, the same-diameter coil having the same diameter wound spirally, and the portion of the stem portion that continues to the mouse portion are surrounded twice on the same plane. And a double-winding coil having the same diameter as the same-diameter coil and a diameter larger than this diameter, and a diameter larger than that of the double-winding coil disposed at the boundary portion between the stem portion and the mouse portion Chi also, the outer peripheral surface coil inner diameter is greater diameter coil than the outermost diameter of the quenching hardened layer of the stem portion comprising in succession,
(2) a columnar coil extending in the height direction of the mouse portion, which is close to the inner peripheral surface of the mouse portion;
(3) A high frequency power supply for the outer peripheral surface coil that supplies high frequency power to the outer peripheral surface coil;
(4) A column-type coil high-frequency power source for supplying high-frequency power to the column-type coil is provided.

here,
(5) The high frequency power supply for the outer peripheral surface and the high frequency power supply for the columnar coil may simultaneously oscillate high frequency power having different frequencies.

Further, tempering method of the present invention for achieving the above object, hardened layer cylindrical stem portion and the inner circumferential surface having a quench-hardened layer outer peripheral surface is quench-hardened is quench-hardened In the tempering method of tempering the outer peripheral surface and the inner peripheral surface of the constant velocity joint outer ring formed with a cylindrical mouse portion having
(6) The same-diameter coil having the same diameter wound spirally around the outer peripheral surface from above the stem portion, and the portion of the stem portion that continues to the mouse portion is surrounded twice on the same plane. And a double-winding coil having the same diameter as the same-diameter coil and a diameter larger than this diameter, and a diameter larger than that of the double-winding coil disposed at the boundary portion between the stem portion and the mouse portion Chi also, the inner diameter to place the outer peripheral surface coil larger diameter coil than the outermost diameter formed by a succession of the quenching hardened layer of the stem portion, so as to close to the inner circumferential surface of the mouth section A columnar coil extending in the height direction of the mouse part
(7) The present invention is characterized in that both the outer peripheral surface coil and the columnar coil are simultaneously supplied with high frequency power having different frequencies from separate high frequency power supplies, and the outer peripheral surface and the inner peripheral surface are simultaneously induction heated and tempered. To do.

  According to the present invention, since the outer peripheral surface and the inner peripheral surface of the constant velocity joint outer ring are simultaneously tempered using separate high-frequency power sources, these outer peripheral surface and The inner peripheral surface can be tempered by induction heating at the same time. Since the outer peripheral surface and the inner peripheral surface are tempered simultaneously in this way, the overall temperature is balanced by the heating effect of each part, and not only the time required for tempering can be shortened but also the tempering operation can be simplified. In addition, even if the boundary between the mouse part and stem part of the constant velocity joint outer ring is thick, a part of the outer peripheral surface where the stem part continues to the mouse part is doubled by the double coil of the outer peripheral coil. Heated by the inner coil of the wound coil, the end surface of the boundary surface is heated by the outer coil of the double wound coil, and this thick part is heated by conduction from the inside of the mouse part by the column coil. Therefore, the entire constant velocity joint outer ring is heated to a uniform temperature.

  The present invention has been realized in a tempering method in which the outer peripheral surface and the inner peripheral surface of the constant velocity joint outer ring are tempered simultaneously.

  With reference to FIG. 1 and FIG. 2, the constant velocity joint outer ring | wheel tempered by the tempering apparatus of this invention is demonstrated. FIG. 1 is a side view showing a constant velocity joint outer ring. FIG. 2 is a bottom view showing the constant velocity joint outer ring of FIG.

  The constant velocity joint outer ring 10 is formed with a columnar stem portion 12 whose outer peripheral surface 12a is hardened by hardening and a cylindrical mouse portion 14 whose inner peripheral surface 14a is hardened and hardened. A hardened and hardened layer 12 b is formed on the outer peripheral surface 12 a of the stem portion 12, and a hardened and hardened layer 14 b is formed on the inner peripheral surface 14 a of the mouse portion 14. The cured depths of the two cured layers 12b and 14b are different from each other, and the cured layer 12b is deeper than the cured layer 14b.

  The stem portion 12 is a solid rod-like one, and the mouse portion 14 is a hollow one whose one end (bottom portion) in the longitudinal direction is continuous with the stem portion 12. The outer diameter of the stem portion 12 is smaller than the inner diameter of the mouse portion 14. Three grooves 14c extending in the height direction (direction orthogonal to the circumferential direction) are formed on the inner circumferential surface of the mouse portion 14 at equal intervals in the circumferential direction. Further, the boundary portion between the stem portion 12 and the mouse portion 14 is a thick portion 16 that is thicker than the thickness of the mouse portion 14. The mouse portion 14 is formed with a rolling portion (groove), an inner ball portion (thick portion), or the like, and in this example, the thick portion 16 is thicker than these.

  The induction heating coil provided in the tempering device will be described with reference to FIGS. FIG. 3 is a side view showing the induction heating coil in which the constant velocity joint outer ring is disposed at the tempering position. FIG. 4 is a perspective view showing a columnar coil. In these drawings, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  The induction heating coil for tempering the hardened layer 12b formed on the outer peripheral surface 12a of the stem portion 12 is an outer peripheral surface coil 22 wound in a spiral shape, and is arranged in close proximity so as to surround the outer peripheral surface 12a. Is. A high frequency power having a frequency of, for example, 3 kHz is supplied to the outer peripheral surface coil 22 from a high frequency power supply 32 for the outer peripheral surface coil.

The outer peripheral surface coil 22 surrounds the outer peripheral surface 12a from above the stem portion 12 (in the direction of arrow L in FIG. 3), and has the same diameter coil 22a having the same diameter. A double winding coil 22b that surrounds the near portion twice on the same plane and has the same diameter as the same diameter coil 22a and a diameter larger than this diameter, and a boundary portion (thickness) between the stem portion 12 and the mouse portion 14 It is a structure in which an enlarged coil 22c having a diameter larger than that of the double-wound coil 22b is arranged in the meat portion 16). The inner diameter of the expanded coil 22c is larger than the outermost diameter of the hardened layer 12b formed on the outer peripheral surface 12a of the stem portion 12.

Induction heating coil order to temper the hardened layer 14b formed on the inner peripheral surface 14a of the mouth section 14 is a pillar-type coil 24 extending in the height direction of the mouth section 14, in proximity to the inner peripheral surface 14a Are arranged. The columnar coil 24 includes three gate-shaped conductor portions 25, 26, and 27 that are electrically connected in series. The portal leg portions 25a, 26a, 27a extend in parallel to each other in the height direction of the mouse portion 14. The upper ends of the pair of leg portions 25a are electrically connected by a connection conductor 25b. Similarly, the leg portions 26a and 27a are electrically connected by connection conductors 26b and 27b. Adjacent leg portions 25a, 26a of the conductor portions 25, 26 are electrically connected by a connection conductor 25c at their lower ends. Similarly, adjacent leg portions 26a and 27a of the conductor portions 26 and 27 are electrically connected by a connection conductor (not shown). The adjacent leg portions 25a and 27a of the conductor portions 25 and 27 are electrically connected to the column-type coil high-frequency power source 34 by separate leads 25d and 27c, respectively. High frequency power having a frequency of, for example, 10 kHz is supplied to the column type coil 24 from a high frequency power supply 34 for column type coil.

  With reference to FIG. 5, FIG. 6, the temperature in each site | part of the constant velocity joint outer ring | wheel 10 at the time of tempering the constant velocity joint outer ring | wheel 10 is demonstrated.

上述したように外周面コイル２２には外周面コイル用高周波電源３２から、周波数が例えば３ｋＨｚの高周波電力が供給される。このように２つの高周波電源３２、３４の周波数を変える理由は、ステム部１２とマウス部１４に形成された焼入れ深さが異なり、またステム部１２の太さ（径）がマウス部１４に比較して細いが、質量ではステム部１２が大きいからである。このような部材（等速ジョイント外輪）を同一の加熱時間で高周波加熱する場合、加熱を深く入れるためには、マウス部１４に比べ、ステム部１２の周波数は低い周波数による加熱が必要である。また、マウス部１４は転動面と内球面で肉厚が異なり、低い周波数で加熱した場合、肉厚の薄い転動面は転球面に比べて加熱による温度上昇が早くなり、均等な昇温が得られない。そこで、ステム部１２に比べ高い周波数の電力をマウス部１４に供給することとした。 FIG. 5 is a graph showing a thermal cycle in which the stem portion 12 and the mouse portion 14 are induction-heated. 6 is a graph showing the temperature distribution at A to F shown in FIG. 1, and (6-1) is a graph at the time of a thermal cycle in which (a) and (d) shown in FIG. 5 are combined. (6-2) is a graph in the case of a thermal cycle in which (b) and (e) shown in FIG. 5 are combined, and (6-3) shows (c) and (f) shown in FIG. It is a graph at the time of the combined heat cycle. A, B, C, D, E, and F shown in FIG. 6 correspond to the positions of A, B, C, D, E, and F shown in FIG. 1, and ◯, X, and Δ are shown in FIG. Corresponding to the positions of ○, ×, and Δ shown. As shown in Table 1, a high frequency power having a frequency of 3 kHz is supplied to the outer peripheral coil 22 from a high frequency power supply 32 for the outer peripheral coil, and a frequency of 10 kHz is supplied to the column coil 24 from the high frequency power supply 34 for the column coil. High frequency power was supplied.

As described above, high frequency power having a frequency of, for example, 3 kHz is supplied to the outer peripheral coil 22 from the high frequency power supply 32 for the outer peripheral coil. The reason for changing the frequencies of the two high-frequency power sources 32 and 34 in this way is that the quenching depth formed in the stem portion 12 and the mouse portion 14 is different, and the thickness (diameter) of the stem portion 12 is compared with that of the mouse portion 14. Although it is thin, the stem portion 12 is large in mass. When such a member (constant velocity joint outer ring) is subjected to high-frequency heating with the same heating time, the stem portion 12 needs to be heated at a lower frequency than the mouse portion 14 in order to deeply heat the member. Further, the thickness of the mouse portion 14 is different between the rolling surface and the inner spherical surface, and when heated at a low frequency, the temperature of the rolling surface with a small thickness is higher than that of the rolling spherical surface. Cannot be obtained. Therefore, power having a higher frequency than that of the stem portion 12 is supplied to the mouse portion 14.

  As shown in FIG. 6, the temperature at each site A to F was within the range of 200 ° to about 260 ° regardless of whether the heating time was 10 seconds or 15 seconds. For this reason, the intended tempering could be completed in a short time.

It is a side view which shows a constant velocity joint outer ring. It is a bottom view which shows the constant velocity joint outer ring | wheel of FIG. It is a side view which shows the induction heating coil by which the constant velocity joint outer ring | wheel was arrange | positioned in the tempering position. It is a perspective view which shows a column type coil. It is a graph which shows the thermal cycle which carries out induction heating of the stem part 12 and the mouse | mouth part 14. FIG. It is a graph which shows the temperature distribution in AF shown in FIG. 1, (6-1) is a graph at the time of the thermal cycle which combined (a) and (d) shown in FIG. 2) is a graph in the case of a thermal cycle combining (b) and (e) shown in FIG. 5, and (6-3) is a thermal cycle combining (c) and (f) shown in FIG. It is a graph at the time of.

DESCRIPTION OF SYMBOLS 10 Constant velocity joint outer ring | wheel 12 Stem part 12a Outer peripheral surface 14 Mouse | mouth part 14a Inner peripheral surface 22 Outer peripheral surface coil 24 Column-shaped coil 32 High frequency power supply for outer peripheral surface coils 34 High frequency power source for column-shaped coil

Claims (3)

The outer circumference of the constant velocity joint outer ring in which a cylindrical stem portion having a hardened hardening layer whose outer peripheral surface is hardened and a cylindrical mouse portion having a hardened hardening layer whose inner peripheral surface is hardened by hardening is formed. In the tempering device for tempering the outer peripheral surface and the inner peripheral surface,
The same-diameter coil having the same diameter wound around the outer peripheral surface from above the stem portion and having the same diameter, and the portion that continues to the mouse portion of the stem portion is double-enclosed on the same plane and the same double wound coil having a same diameter as the diameter coil and larger in diameter than the diameter, and, Chi also a diameter greater than the double rolled coil while being disposed in a boundary area between the stem portion and the mouth portion An outer peripheral surface coil in which an expanded coil having an inner diameter larger than the outermost diameter of the quench-hardened layer of the stem portion is continuously formed;
A columnar coil extending in the height direction of the mouse part, close to the inner peripheral surface of the mouse part;
A high frequency power supply for the outer peripheral surface coil for supplying high frequency power to the outer peripheral surface coil;
A tempering apparatus comprising: a high frequency power source for a columnar coil that supplies high frequency power to the columnar coil. 2. The tempering apparatus according to claim 1, wherein the outer peripheral surface coil high-frequency power source and the columnar coil high-frequency power source simultaneously oscillate high-frequency power having different frequencies. The outer circumference of the constant velocity joint outer ring in which a cylindrical stem portion having a hardened hardening layer whose outer peripheral surface is hardened and a cylindrical mouse portion having a hardened hardening layer whose inner peripheral surface is hardened by hardening is formed. In the tempering method of tempering the outer peripheral surface and the inner peripheral surface,
The same-diameter coil having the same diameter wound around the outer peripheral surface from above the stem portion and having the same diameter, and the portion that continues to the mouse portion of the stem portion is double-enclosed on the same plane and the same A double wound coil having the same diameter as the diameter coil and a diameter larger than this diameter,
And an enlarged diameter which is disposed at a boundary portion between the stem portion and the mouse portion and has a diameter larger than that of the double-winding coil and whose inner diameter is larger than the outermost diameter of the quench-hardened layer of the stem portion. While arranging the outer peripheral surface coil consisting of continuous coils, and arranging the columnar coil extending in the height direction of the mouse part so as to be close to the inner peripheral surface of the mouse part,
Tempering characterized in that both the outer peripheral surface coil and the columnar coil are simultaneously supplied with high frequency power having different frequencies from different high frequency power sources, and the outer peripheral surface and the inner peripheral surface are simultaneously induction heated and tempered. Method.

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