JP4076801B2 - Method and apparatus for induction heating and quenching of ring member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for quenching a ring member such as a bush by induction heating.
[0002]
[Prior art]
Conventionally, when induction heating and quenching is performed on the inner and outer circumferences of ring members such as bushes and the entire surface of both sides, the lower three parts of the ring member to be quenched are supported and heated from the outer circumference using a cylindrical heating coil. The method of quenching was then adopted.
[0003]
[Problems to be solved by the invention]
However, this method has a problem in that the temperature of the portion s corresponding to the support point of the ring member W is lowered as shown in FIG. Further, in this method, since the entire ring is heated uniformly from the outer periphery to the inner periphery, electric power is required, heating time is lengthened, productivity is lowered, and cost is increased.
[0004]
Accordingly, the present invention has an object to provide a method and apparatus for induction heating and quenching of a ring member that solves these problems and heats the ring member in a short time and uniformly to improve productivity and reduce costs. To do.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an induction heating and quenching method for a ring member according to the present invention includes two brazed shafts provided with one or more pairs of scissors at symmetrical positions of the shafts arranged in parallel. Drive means for placing one or a plurality of quenching ring members between each pair of flanges on the flanged shaft to rotationally drive the flanged shaft, and a target mounted on the flanged shaft. and a heating coil half-moon of one or more pairs of current flow in the same direction which is disposed on both sides of the quench ring member, and heated while rotating the該被quenching ring member, the one or The inner and outer peripheral surfaces and both side surfaces of the plurality of ring members are quenched.
[0006]
That is, according to the present invention, the quenching ring member is heated from both sides, so that the outer and inner circumferences of the ring are also heated from both sides and the temperature rises, compared with the case where the conventional cylindrical coil is heated from the outer circumference. Thus, the temperature on the side surface and inner periphery can be increased quickly and can be heated in a short time. Further, since current flows in the same direction in the heating coils on both side surfaces of the ring member, the magnetic flux can be efficiently heated without being canceled out. Further, since the ring member is heated while rotating, the entire ring is uniformly heated, and a soft spot on the quenched surface is not generated.
[0007]
In order to perform the above quenching, the ring member induction heating and quenching apparatus of the present invention includes two brazed shafts provided with one or more pairs of scissors at symmetrical positions of parallel shafts, A drive means for rotating one or more quenching ring members between each pair of ribs on the brazing shaft to rotationally drive the brazing shaft, and to be hardened placed on the brazing shaft One or more pairs of half-moon-shaped heating coils arranged on both side surfaces of the ring member and in which current flows in the same direction, and heating the hardened ring member while rotating, The inner and outer peripheral surfaces and both side surfaces of the ring member are quenched .
[0008]
Since the ring member induction heating and quenching apparatus of the present invention has the above-described configuration, a large number of ring members can be quenched at the same time , which is desirable for improving productivity and reducing costs.
[0009]
The rotating means includes two brazing shafts provided with one or more pairs of ridges at symmetrical positions arranged in parallel, and a quenching ring between each pair of ridges on the brazing shaft. It is desirable to place the member and rotate the brazed shaft to rotationally drive one or a plurality of quenched ring members in order to easily achieve the above object. In this case, when the half-moon shaped heating coil is used, the brazed shaft does not interfere with the coil.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be specifically described below with reference to the illustrated embodiments. FIG. 1 is a perspective view of an induction heating and quenching apparatus for quenching two quenching ring members simultaneously according to an embodiment of the present invention, FIG. 2 is a top view thereof, FIG. 3 is a side view thereof, and FIG. FIG.
[0011]
In these drawings, a rotating means 1 for rotating a to-be-quenched ring member (hereinafter referred to as a workpiece) W is composed of two brazed shafts 2 and 2 arranged in parallel. The pair of scissors 2 and 2 are provided with two pairs of scissors, that is, a pair of scissors 3a, 3b and 3c, 3d at symmetrical positions. The inner space between the pair of rods 3a, 3b and 3c, 3d is such that when the workpieces Wa, Wb are respectively placed on the axes between the rods 3a, 3b and 3c, 3d, the rods serve as guides. The work can be slid and rotated. Thus, the flanged shafts 2 and 2 are rotated by driving means such as a motor (not shown), and the workpiece W is rotationally driven by the friction between the shafts 2 and 2 and the workpiece W.
[0012]
The heating coil 10 has a half-moon shape having an arc portion 11 and a straight chord portion 13, one end of the arc portion 11 and one end of the chord portion 13 are connected, and the other end of the arc portion 11 and the other end of the chord portion 13 are connected. Are connected to the arc drawing portion 12 and the string drawing portion 14, respectively. A pair of half-moon shaped heating coils 10a and 10b is placed on both sides of one workpiece Wa placed on the flanged shaft, and another pair of heating coils 10c and 10d is placed on both sides of the other workpiece Wb. Are provided with predetermined gaps from the side surfaces of the workpieces. The shape of the arc portion 11 is such that the coil covers the side surface of the workpiece W and heats the side surface and the inner and outer circumferences of the workpiece W.
[0013]
These two pairs of heating coils 10a, 10b, 10c, and 10d are connected so that current flows through all the coils in the same direction. That is, as shown in FIG. 4, the terminal 20 connected to the high frequency power source is connected to the arc lead portion 12a of the heating coil 10a via the connecting conductor 15, and the string lead portion 14a of the coil is connected to the heating coil via the connecting conductor 16. 10b is connected to the arc lead portion 12b. Similarly, the string lead portion 14b of the heating coil 10b is connected to the arc lead portion 12c of the heating coil 10c via the connecting conductor 17, and the string lead portion 14c is connected to the arc lead portion 12d of the heating coil 10d via the connecting conductor 18. Is done. The string lead portion 14 d of the heating coil 10 d is connected to the terminal 21 via the connecting conductor 19. As a result, when a current is applied from the terminals 20 and 21, the current flows through the four heating coils 10a, 10b, 10c, and 10d in the same direction as shown in FIG.
[0014]
Here, the half-moon shape of the heating coil includes both a case of an arc smaller than a semicircle and a shape of a large arc. When the workpiece is rotationally driven using a brazed shaft as in this embodiment, the half-moon shape is preferable because it does not interfere with the shaft, but a circular coil may be used depending on the driving method. In the present embodiment, the case where two workpieces are simultaneously quenched has been described. However, three or more workpieces can be quenched simultaneously.
[0015]
A quenching method using the induction heating quenching apparatus for the ring member having the above-described configuration will be described. First, the workpieces Wa and Wb are placed between the pair of rods 3a and 3b and 3c and 3d on the rod shafts 2 and 2, respectively. The brazing shafts 2 and 2 are rotated by driving means such as a motor (not shown) to rotationally drive the workpieces Wa and Wb.
[0016]
Then, with the work rotated, the heating coils 10a, 10b. Current is added to 10c and 10d. Then, the workpiece W is heated from both side surfaces, and the inner and outer peripheral surfaces are also heated sequentially. When the workpiece W is heated to the quenching temperature, it is quenched and quenched by cooling liquid injection or the like by a cooling means (not shown).
[0017]
Thus, according to the method of the present invention, since the workpiece is heated from both sides, the entire surface is heated in a shorter time than the conventional method of heating from the outer periphery. Thereby, there is little electric power and the cost of quenching heat processing can be reduced. In addition, since there is no work support point during heating, the whole is uniformly heat-hardened without generating soft spots during hardening corresponding to the conventional support points. Further, since a plurality of ring members can be quenched at the same time, the mass productivity is high.
[0018]
【The invention's effect】
As described above, according to the induction heating and quenching method and apparatus for a ring member of the present invention, it is possible to form a uniform hardened layer on the entire surface of the ring member in a short time with high power efficiency. Cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of an induction heating and quenching apparatus for ring members according to an embodiment of the present invention. FIG. 2 is a top view of an induction heating and quenching apparatus for ring members according to an embodiment of the present invention. Side view of member induction heating and quenching apparatus [FIG. 4] Connection diagram of heating coil of ring member induction heating and quenching apparatus of embodiment of the present invention [FIG. 5] When ring member induction heating and quenching is performed by a conventional method Drawing explaining the resulting soft spot 【Explanation of symbols】
W Workpiece (Ring member), 1 Rotating means, 2 Shafted shaft, 3 鍔, 10 Heating coil, 11 Arc part, 12 Arc drawing part, 13 String part, 14 String drawing part, 15, 16, 17, 18, 19 Connecting conductor, 20, 21 terminal

Claims (2)

Two brazed shafts provided with one or more pairs of ridges at symmetrical positions of the shafts arranged in parallel, and one or more quenched rings between each pair of ridges on the brazed shaft a driving means for rotating the collar with the shaft by placing the member, a pair of current flow in the same direction which is disposed on both sides of the quench ring member placed on the axis with the collar or A ring having a plurality of pairs of half-moon-shaped heating coils , wherein the quenching ring member is heated while rotating to quench the inner and outer peripheral surfaces and both side surfaces of the one or more ring members. Induction heating and quenching method for members. Two brazed shafts provided with one or more pairs of ridges at symmetrical positions of the shafts arranged in parallel, and one or more quenched rings between each pair of ridges on the brazed shaft a driving means for rotating the collar with the shaft by placing the member, a pair of current flow in the same direction which is disposed on both sides of the quench ring member placed on the axis with the collar or A ring having a plurality of pairs of half-moon-shaped heating coils, wherein the quenching ring member is heated while rotating to quench the inner and outer peripheral surfaces and both side surfaces of the one or more ring members. Induction heating and quenching equipment for components.

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