JPH0715766U - Induction hardening coil for cam groove of cylindrical cam and induction hardening device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Both sides of part of the cam groove 302 of the cylindrical cam 300
A quenching coil body capable of simultaneously forming a hardened layer having a uniform depth on 303 and 304 mechanically and in a short time. [Constitution] The quenching coil body 100 has a shape corresponding to the shape of the side surface 303 and a heating conductor 111 arranged so as to approach and face the side surface 303, and a shape corresponding to the shape of the side surface 304. The heating conductor 113 is arranged so as to approach the side surface 304 and face each other, one ends of the heating conductors 111 and 113 are connected to each other, and one end of the heating conductor 112 and the other end of the heating conductor 113 are connected, respectively, and the heating conductor 113 is moved away from the cam groove 302 The connecting conductors 114 and 115 formed in a substantially arc shape, the magnetic core 121 mounted on the heating conductors 111 and 112, the core 122 mounted on the heating conductor 113, and the bottom surface 305 of the cam groove 302. The quenching liquid injection pipe 130 is attached to the cores 121 and 122 so that their tips are opposed to each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an induction hardening coil body capable of simultaneously quenching both side surfaces of a part of a cam groove having a substantially rectangular cross section of a cylindrical cam (hereinafter, an induction hardening coil body is also referred to as a hardening coil body). And an induction hardening device capable of quenching simultaneously both sides of a predetermined range on both sides of the lowest point and the highest point of the cam groove when the shaft core of the cylindrical cam is arranged vertically. .

[0002]

[Prior art]

 The conventional technique will be described below. First, the cylindrical cam will be described with reference to the drawings. As shown in FIGS. 14 and 15, the outer peripheral surface 301 of the cylindrical cam 300 in which the axis 310 is arranged to be vertical includes a bottom surface 305, an upper side surface 303, and a lower side parallel to the upper side surface 30 3. An annular cam groove 302 having a rectangular cross section having a side surface 304 and surrounding the outer peripheral surface 301 is formed. The direction of the cam groove 302 is the same as the circumferential direction at the lowest point 306 and the highest point 307 of the cam groove 302, but is different from the circumferential direction at other points.

An upper side surface 303 and a lower side surface 304 within a predetermined range on both sides of the lowest point 306 of the cam groove 302 (hereinafter, such upper side surface 303 and lower side surface 304 are referred to as hardened surfaces 308a and 308b, respectively), and , The upper side surface 303 and the lower side surface 304 within a predetermined range on both sides of the uppermost point 307 of the cam groove 302 (hereinafter, the upper side surface 303 and the lower side surface 304 are referred to as hardened surfaces 308c and 308d, respectively) When a cam (not shown) moves along the groove 302, it is often subjected to strong stress from the cam. Therefore, it is required to form the hardened layer 309 on each of the hardened surfaces 308a to 308d.

Now, for example, consider the case where the hardened layer 309 is formed on the surface 308b to be hardened. To heat the hardened surface 308b with high frequency, a high frequency current is applied to a so-called hairpin type high frequency heating coil (hereinafter referred to as a hairpin coil) having a hairpin-like shape, and the hairpin coil is heated to the hardened surface 308b. While moving the hardened surface 308b from one end to the other end.

When moving the hairpin coil, quenching liquid is jetted from the hairpin coil obliquely rearward with respect to the moving direction of the hairpin coil, and the heated portion of the hardened surface 308b is sequentially cooled to be hardened. A hardened layer 309 is formed on the surface 308b. Quenching of the hardened surfaces 308a, 308c, and 308d is similarly performed.

[0006]

[Problems to be solved by the device]

 In the conventional quenching technology for the side surface of the cam groove described above, the four quenching surfaces of one cylindrical cam are sequentially and manually moved and quenched one by one. That is, (1) since it is the moving quenching by hand, it takes skill to keep the gap distance between the hairpin coil and the surface to be quenched constant, and the hardened layer often formed on the side surface of the cam groove. There was a drawback that it lacked uniformity in depth. (2) In addition, since the quenching is performed by moving each quenching surface one by one, there is an inconvenience that it takes a long time to quench the cylindrical cam.

The present invention was devised in view of the above circumstances, and mechanically and simultaneously quenches both side surfaces of a part of the cam groove of a cylindrical cam to obtain a uniform depth. To provide an induction hardening coil body for a cam groove of a cylindrical cam capable of forming a hardened layer on both side surfaces of a part of the cam groove in a short time, and using this hardening coil body, Mechanically and simultaneously quenching both side surfaces within a specified range on both sides of the lowest point and the highest point of the cam groove when the axis of the cylindrical cam is arranged vertically, and uniformly deepening both sides. It is an object of the present invention to provide an induction hardening apparatus capable of forming a hardened layer of the sand in a short time.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the invention according to claim 1 is a cylindrical cam which simultaneously quenches both side surfaces of a part of a cam groove having an approximately rectangular cross section formed on the outer peripheral surface of the cylindrical cam. An induction hardening coil for a cam groove, the pair of heating conductors having a shape corresponding to the shape of the both side surfaces and arranged so as to approach and face the both side surfaces, respectively. A heating coil having a pair of connecting conductors formed in a substantially arc shape so as to connect both ends to each other and away from the cam groove, and a pair of lead conductors connected to a cut point of the heating conductor, A magnetic core attached to a heating conductor; a quenching liquid injection pipe attached to the core so that its tip faces the bottom surface of the cam groove; and a heating conductor attached to both ends of the heating coil and the heating conductor. A pair of pairs that keep the distance from both sides constant The spacer is formed in a substantially rectangular shape corresponding to the cross-sectional shape of the cam groove, is supported by the spacer, is arranged in the cam groove, and blocks the quenching liquid injected into the cam groove 1 And a pair of quenching liquid blocking members.

According to the second aspect of the present invention, when the cylindrical cam is arranged such that its axis is vertical, the outermost surface of the cylindrical cam has an annular cam groove having a substantially rectangular cross section. An induction hardening device for a cam groove of a cylindrical cam, which simultaneously quenches a first side surface within a predetermined range on both sides of a lower point and a second side surface within a predetermined range on both sides of an uppermost point. A pair of first heating conductors having a shape corresponding to that of the first heating conductors and arranged so as to approach and face the first side surfaces, and both ends of the first heating conductors are connected to each other to form the cam groove. A first heating coil having a pair of first connection conductors formed in a substantially arc shape away from the first heating conductor and a pair of first lead conductors connected to a cut point of the first heating conductor; The tip of the magnetic core mounted on the heating conductor faces the bottom of the cam groove. And a pair of first quenching liquid injection pipes attached to the core so as to maintain a constant distance between the first heating conductor and the both side faces attached to both ends of the first heating coil. The spacer and the substantially rectangular shape corresponding to the cross-sectional shape of the cam groove are supported by the first spacer and are arranged in the cam groove to block the quenching liquid injected into the cam groove. A first induction hardening coil body having a pair of first quenching fluid blocking members, and a shape corresponding to the shapes of the second side surfaces so that the second side surfaces approach and face each other. A pair of second heating conductors that are arranged, a pair of second connecting conductors that are connected to both ends of the second heating conductors, and that are formed in a substantially arc shape so as to move away from the cam groove; And a pair of second lead conductors connected to the cut points of the two heating conductors. A coil, a second core made of a magnetic material attached to the second heating coil, a second quenching liquid injection pipe attached to the core so that its tip faces the bottom surface of the cam groove, and the second heating A pair of second spacers attached to both ends of the coil to keep the distance between the second heating conductor and the both side surfaces constant, and formed in a substantially rectangular shape corresponding to the cross-sectional shape of the cam groove. A first induction hardening coil body provided with a pair of second quenching liquid blocking members which are supported by the second spacers and which are arranged in the cam groove and block the quenching liquid injected into the cam groove. A first induction coil body moving device that inserts and pulls out the first induction hardening coil body near the lowermost point of the cam groove, and a second induction hardening coil body near the uppermost point of the cam groove. A second quenching coil moving device for inserting and pulling out is provided.

[0010]

【Example】

 Embodiments of a quenching coil body and an induction hardening apparatus of the present invention will be described below with reference to the drawings. 1 to 15 are drawings for explaining these embodiments, and FIG. 1 is a front explanatory view of a quenching coil body for quenching both sides of a predetermined range on both sides of the lowest point of the cam groove. 9 is a sectional view taken along line AA, BB, CC, DD, EE, FF, GG, and HH of FIG. FIG. 10, (a) of FIG. 10 is a plan view of the spacer, (b) and (c) are cross-sectional views taken along line JJ and KK of (a), respectively, and FIG. 11 is a schematic perspective view of the heating coil. Fig. 12 and Fig. 12 are front views of a quenching coil body that quenches both sides of a predetermined area on both sides of the uppermost point of the cam groove. Fig. 13 is a plan view of the induction hardening device. Fig. 14 is a cylindrical cam that is a workpiece. FIG. 15 is a sectional view taken along the line MM in FIG. As in the case of the conventional technique, the case of quenching the hardened surfaces 308a to 308d of the cylindrical cam 300 shown in FIGS. 14 and 15 will be described.

The induction hardening apparatus of the present embodiment is an apparatus capable of simultaneously hardening the hardened surfaces 308a to 308d of the cylindrical cam 300, and as shown in FIG. (Used for hardening hardened surfaces 308a, 308b), hardened coil body 200 (used for hardening hardened surfaces 308c, 308d), quenching for moving hardened coil body 100 A coil body moving device 180, a quenching coil body moving device 280 for moving the quenching coil body 200, and a power supply device 400 common to the quenching coil bodies 100 and 200 are provided.

As shown in FIGS. 1 and 11, the quenching coil body 100 includes a heating coil 110 made of a highly conductive copper tube, magnetic cores 121 and 122 made of ferrite or the like, and four cores (as appropriate). Of the quenching liquid injection pipe 130, four spacers 140, and a pair of insulating heat resistant plate-shaped quenching liquid blocking members 140 made of glass laminate or the like. The basic structure is to be present.

The quenching coil body 100 will be described in detail below. The heating coil 110 has a shape corresponding to the shape of the hardened surface 308a on one side and the other side of the lowermost point 306 of the cam groove 302, and approaches and faces the hardened surface 308a. The heating conductors 111 and 112 arranged in this manner have a shape corresponding to the shape of the hardened surface 308b on both sides of the lowest point 306 of the cam groove 302, and should be close to and facing the hardened surface 308b. Of the heating conductor 112 and one end of the heating conductor 112, the connection conductor 114 (FIG. 4) formed by connecting one ends of the heating conductors 111 and 113 to each other, and forming a substantially arc shape away from the cam groove 302. And a heating conductor 113 and the other end of the heating conductor 113 are connected to each other, and the connecting conductor 115 is formed in a substantially arc shape away from the cam groove 302, and a pair of lead conductors respectively connected to the other ends of the heating conductors 111 and 112. With 116 and 117. The connecting conductors 114 and 115 are formed in a substantially arc shape in order to prevent heating of the bottom surface 305 of the cam groove 302 by these connecting conductors.

As shown in FIG. 11, the heating conductor 111 connects the heating conductors 1111 and 1112, the heating conductor 112 connects the heating conductors 1121 and 1122, the heating conductor 113 connects the heating conductors 1131 and 1132, and the connecting conductor 114 connects. The conductors 1141 and 1142 are provided, and the connection conductor 115 is provided with the connection conductors 1151 and 1152, respectively. These conductors 1111, 1112, 1121, 1122, 1131, 1132, 1141, 1142, 1151, and 1152 are made of square copper tubes, and the conductors 1111 and 1112 are fixed by brazing over their respective lengths. There is. The same applies to the conductors 1121 and 1122, 1131 and 1132, 1141 and 1142, and 1151 and 1152. Then, as shown in FIGS. 4 to 6, FIG. 8, and FIG. 9, the conductors 1112, 1122, 1132, 1142, and 1152 are provided on the bottom surface 305 side of the conductors 1111, 1121, 1131, 1141, and 1151, respectively. It is arranged.

Reference numerals 116a and 116b shown in FIGS. 7 and 11 are cooling liquid supply ports of the heating coil 110 attached to the connection points of the lead conductors 1161 and 1162 to the lead conductor 1163, respectively. 117a and 117b shown in FIG. 3 are cooling liquid discharge ports of the heating coil 110 attached to the connection points of the lead conductors 1171 and 1172 to the lead conductor 1173, respectively.

As shown in FIGS. 6 and 8, the core 121 includes the heating conductor 111 so as to cover the surface of the heating conductors 1111 and 1112 on the side opposite to the hardened surface 308a and the side surface of the heating conductor 1112 on the side of the bottom surface 305. Further, the heating conductors 1121 and 1122 are attached to the heating conductor 112 by adhesion so as to cover the surfaces of the heating conductors 1121 and 1122 on the side opposite to the hardened surface 308a and the side surfaces of the heating conductor 1122 on the bottom surface 305 side. Further, the core 122 is attached to the heating conductor 113 by adhesion so as to cover the surfaces of the heating conductors 1131 and 1132 on the side opposite to the hardened surface 308b and the side surface of the heating conductor 1132 on the bottom surface 305 side.

As shown in FIGS. 1 and 5, four quenching liquid injection pipes 130 are attached to the cores 121 and 122 by adhesion so as to be substantially orthogonal to the bottom surface 305 of the cam groove 302. The tip of the quenching liquid injection pipe 130 is fixed on the same surface as the end surfaces 121a, 122a of the cores 121, 122, but the rear end portion is pulled out so as to project from the other end surface of the cores 121, 122. A flexible quenching liquid supply pipe 131 is connected to the pulled out portion.

As shown in FIG. 10, the spacer 140 includes a cylindrical large-diameter portion 141a and a cylindrical small-diameter portion 141b having a smaller diameter than the large-diameter portion 141a and integrally formed with the large-diameter portion 141a. Further, it is provided with an insulating ceramic chip 141 and a square columnar copper-made chip holder 142 which is in close contact with and surrounds the outer peripheral surface of the chip 141 slightly beyond a half circumference. Incidentally, 141c is an outer peripheral surface of the large diameter portion 141a, and 141d is a bottom surface of the chip 141.

As shown in FIGS. 3 and 4 by taking the two upper left and lower spacers 140 on the left side shown in FIG. 1 as an example, the tip holder 142 is formed on one end surface of the heating coil 110. That is, the tip holder 142 of the upper spacer 140 is adhered to the heating conductor 1112 and the connecting conductor 1142, and the tip holder 142 of the lower spacer 140 is adhered to the heating conductor 1132 and the connecting conductor 1142, respectively. It is fixed. In a similar manner, the tip holder 142 of the upper spacer 140 on the right side in FIG. 1 is the heating conductor 1122 and the connecting conductor 1152, and the tip holder 142 of the lower spacer 140 is the heating conductor 1132 and the connecting conductor. 1152, each attached by gluing.

As shown in FIGS. 1 and 2, in the plate-shaped quenching liquid blocking member 150, the quenching liquid injected from the quenching liquid injection pipe 130 has a surface to be hardened in the cam groove 302. It is to prevent leakage into the cam groove 302 other than the portions 308a and 308b as much as possible, and is formed in a rectangular shape corresponding to the cross-sectional shape of the cam groove 302. A bolt 151 is attached to the 110 side so as to bridge the upper and lower chip holders 142 so as to divide the cam groove 302 into a region slightly wider than the hardened surfaces 308a and 308b.

The lead conductors 116 are lead conductors 1161 and 1162 made of a rectangular copper tube connected to the heating conductors 1111 and 1112 of the heating conductor 111, respectively, and a plate-like lead to which the lead conductors 1161 and 1162 are connected. And a conductor 1163. Similarly, the lead conductors 117 are the lead conductors 1171 and 1172 made of a rectangular copper tube connected to the heating conductors 1121 and 1122 of the heating conductor 112, respectively, and the plate-shaped lead conductors to which the lead conductors 1171 and 1172 are connected. It has a body 1173. As shown in FIG. 13, the lead conductors 1163 and 1173 are arranged and extended in parallel, and movable contact pieces 1164 and 1174 are attached to the respective tips.

The quenching coil body 200 is a quenching coil body for quenching the upper side surface 303 and the lower side surface 304 within a predetermined range on both sides of the uppermost point 307 of the cam groove 302, that is, the hardened surfaces 308c and 308d. As shown in FIGS. 12 and 13, the heating coil 110 of the quenching coil body 100, the heating conductors 111, 112, 113, the connection conductors 114, 115, the lead conductors 116, 1161, 1162, 1163, 117, 1171. , 1172, 1173, movable contact pieces 1164, 1174, cores 121, 122, quenching liquid injection tube 130, spacer 140, and quenching liquid blocking member 150, respectively, heating coil 210, heating conductors 211, 212, 213, connection conductors 214 and 215, lead conductors 216, 2161, 2162, 2163, 217, 2171, 2172, 2173, movable contact pieces 2164, 2174, cores 221, 222, quenching liquid injection pipe 230, spacer 240, and A quenching liquid blocking member 250 is provided.

The quenching coil body moving device 180 shown in FIG. 13 moves the quenching coil body 100 in the direction of arrow P and in the direction of arrow Q opposite to the arrow P to move the quenching coil body 100 to the bottom. The movable contact pieces 1164 and 1174 provided at the tips of the lead conductors 1163 and 1173 are fixed to the fixed contact pieces 411 and 412 of the power supply device 400, respectively, at the same time as inserting and pulling out in the cam groove 302 near the point 30 6. And to release the contact.

The quenching coil body moving device 180 includes a quenching coil body supporting member 181 to which the lead conductors 1163 and 1173 bent in a U shape are fixed, and a quenching coil body supporting member 181. The rod 182, the cylinder 183 for moving the rod 182 forward and backward, and the one end portion of the quenching coil body supporting member 181 slidably fitted, and the guide rail 184 arranged in the direction of arrow P, A pair of rail supporting members 185 supporting both ends of the guide rail 184 and the other end portion of the quenching coil body supporting member 181 are slidably fitted and arranged in the direction of arrow P. The rail 186 and a pair of rail support members 187 supporting both ends of the guide rail 186 are provided.

The quenching coil body moving device 280 moves the quenching coil body 200 in the directions of arrows Q and P to insert the quenching coil body 200 into the cam groove 302 near the uppermost point 307, and Simultaneously with pulling out, the movable contact pieces 2164, 2174 provided at the tips of the lead conductors 2163, 2173 are brought into contact with and released from the fixed contact pieces 421, 422 of the power supply device 400, respectively. , A quenching coil body supporting member 181, a rod 182, a cylinder 183, guide rails 184, 186, rail supporting members 185, and 187 of the quenching coil body moving device 180, respectively. A rod 282, a cylinder 283, guide rails 284 and 286, rail support members 285 and 287 are provided.

The power supply device 400 includes a high-frequency power source 410, a pair of switches 414 and 424 that are turned on and off in conjunction with each other, fixed contact pieces 411 and 412 with which the movable contact pieces 1164 and 1174 come into contact, respectively, and a movable contact. The fixed contact pieces 421 and 422 with which the contact pieces 2164 and 2174 contact each other, and the lead conductors 413 and 423 connecting the fixed contact pieces 411 and 421 to the high frequency power supply 410 via the switches 414 and 424, respectively, and the fixed contact pieces. It has a lead conductor 415 connecting 412 and 422.

Next, the operation of this embodiment will be described. First, the cylindrical cam 300 to be quenched is arranged at a predetermined quenching position so that the axis 310 is usually vertical, and then the cooling liquid is supplied to the cooling liquid supply ports 116a and 116b of the heating coil 110. Then, the cooling liquid flows in the hollow portion of each conductor in the direction of the arrow not shown in FIG. 11, cools the heating coil 110, and is then discharged from the cooling liquid discharge ports 117a and 117b. Coolant is also supplied to and discharged from the heating coil 210.

Next, the cylinders 183 and 283 of the quenching coil body moving devices 180 and 280 are operated to advance the rods 182 and 282, and the quenching coil body supporting members 181 and 281 are moved in the directions of arrows P and Q, respectively. The heating coil 110 of the quenching coil body 100 is moved between the quenching surfaces 308a and 308b, and the heating coil 210 of the quenching coil body 200 is inserted between the quenching surfaces 308c and 308d. The movable contact pieces 1164 and 1174 are brought into contact with the fixed contact pieces 411 and 412, respectively, and the movable contact pieces 2164 and 2174 are brought into contact with the fixed contact pieces 421 and 422, respectively.

Then, the heating conductors 111 and 112 of the heating coil 110 are on the hardened surface 308a, the heating conductor 113 is on the hardened surface 308b, and the heating conductor 213 of the heating coil 210 is on the hardened surface 308c. The heating conductors 211 and 212 are arranged so as to approach and face the surface to be hardened 308d, respectively. At this time, the bottom surface 141d of the tip 141 of each spacer 140 is in contact with the bottom surface 305 of the cam groove 302, and the large size of the tips 141 of the upper two and lower two spacers 140 in FIG. The outer peripheral surface 141d of the diameter portion 141a is in contact with the upper side surface 303 and the lower side surface 304 of the cam groove 302, respectively.

Then, when the switches 414 and 424 are turned on, a high-frequency current from the high-frequency power supply 410 causes a lead conductor 413, a fixed contact piece 411, a movable contact piece 1164, a lead conductor 116, a heating coil 110, a lead conductor 117, a movable contact. Of the strip 1174, the fixed contact strip 412, the lead conductor 415, the fixed contact strip 422, the movable contact strip 2174, the lead conductor 217, the heating coil 210, the lead conductor 216, the movable contact strip 2164, the fixed contact strip 421, and the lead conductor 423. It flows through the route or the reverse route.

A high frequency current is passed through the heating coils 110 and 210 for a predetermined time to heat the hardened surfaces 308a to 308d. After that, the switches 414 and 424 are turned off to stop energizing the heating coils 110 and 210, and then the quenching liquid supply pipe 131 of the quenching coil body 100 and the quenching liquid (not shown) of the quenching coil body 200 are shown. Supply the quenching liquid to the supply pipe.

The operation of the quenching liquid will be described by taking the quenching coil body 100 as an example. As shown in FIG. 5, the quenching liquid supplied to the two quenching liquid jetting tubes 130 on the left side in FIG. 1 flows in the direction of the unmarked arrow. That is, the quenching liquid injected from the tip of the quenching liquid injection pipe 130 collides with the bottom surface 305 of the cam groove 302, and a part of the quenching liquid passes through between the bottom surface 305 and the core 121. After passing through between the heating conductor 111 and the surface to be hardened 308a, the heated surface to be hardened 308a is cooled and then discharged to the outside of the cam groove 302. After passing between the bottom surface 305 and the core 122, another part of the quenching liquid passes between the heating conductor 113 and the quenching surface 308b to cool the heated quenching surface 308b. Is discharged to the outside of the cam groove 302. The quenching liquid supplied to the two quenching liquid injection pipes 130 on the right side in FIG. 1 also cools the surfaces to be quenched 308a, 308b.

Further, the remaining quenching liquid passes through between the bottom surface 305 and the cores 121 and 122, and then a pair of spacers are attached at intervals so as to face both ends of the heating coil 110. After passing through the space 140, it collides with the quenching liquid blocking member 150 and is discharged to the outside of the cam groove 302. By providing the quenching liquid blocking member 150, the quenching liquid blocking member 150 prevents the scattering of the quenching liquid almost to the portions other than the hardened surfaces 308a and 308b, and the quenching liquid blocking member 150 functions as a weir. Then, a larger amount of the quenching liquid injected into the cam groove 302 passes through the hardened surfaces 308a, 308b to improve the cooling effect of the hardened surfaces 308a, 308b. Quenching liquid of quenching coil body 200 The quenching liquid injected from the injection pipe 230 also operates in the same manner.

When cooling of the hardened surfaces 308a, 308b is completed, the cylinders 183 and 283 are operated to move the quenching coil bodies 100 and 200 in the directions of arrows Q and P, respectively, and the quenching is performed from the cam groove 302. The coil bodies 100, 200 are pulled out, and the movable contact pieces 1164, 1174 and 2164, 2174 are released from contact with the fixed contact pieces 411, 412 and 421, 422, respectively. Then, the columnar cam 300 is replaced with the columnar cam 300 to be quenched, and then the next columnar cam 300 is quenched in the same manner as described above.

As described above, since the hardened coil body 100 can simultaneously harden the hardened surfaces 308a and 308b of the cam groove of the cylindrical cam 300, the hardened surfaces 308a and 308b are hardened. The entry time can be shortened. Similarly, the quenching coil body 200 can also shorten the quenching time of the hardened surfaces 308c and 308d. In addition, since the induction hardening apparatus of this embodiment can simultaneously quench the surfaces to be hardened 308a to 308d, when quenching a large number of cylindrical cams 300, the entire quenching work time is reduced. It can be shortened.

In this embodiment, for example, in the heating coil 110, as described above, the lead conductors 116 and 117 are connected between the other ends of the heating conductors 11 1 and 112. This is because the mass of the cylindrical work 300 on the side of the hardened surface 308a is smaller than the mass on the side of the hardened surface 308b, so the heating amount of the hardened surface 308a by the heating conductors 111 and 112 is From the viewpoint that it is preferable to make the amount of heating of the hardened surface 308b slightly smaller than that of the hardened surface 308b by the conductor 113, the connection of the lead conductors 116 and 117 to the heating conductor is performed on the hardened surface 308a side (heating conductor). 111 and 112).

That is, when the heating conductors 111 and 112 are made into one continuous heating conductor, the lead conductors 116 and 117 are connected to the cutting point 111a (FIG. 1 and FIG. 11) of this one heating conductor. However, depending on the shape of the cam groove 302 and the material of the cylindrical cam 300, it is not always necessary to stick to this, and the lead conductors 116 and 117 can be connected to the cutting point of the heating conductor 113. The cutting point is not limited to being provided in the central portion of the heating conductor, and may be provided at an appropriate position of the heating conductor in consideration of the arrangement of parts around the heating coil 110 and the like. The same applies to the lead conductors 216 and 217 of the heating coil 210.

[0038]

[Effect of device]

 As described above, the quenching coil body for a cam groove of a cylindrical cam according to claim 1 is a cam groove for a cam groove having a substantially rectangular cross section formed on the outer peripheral surface of the cylindrical cam. An induction hardening coil for a cam groove of a cylindrical cam that hardens the hardened surface so that both hardened surfaces approach and face each other and that the distance between both hardened surfaces is kept constant. After simultaneously heating both quenching surfaces by a pair of heating conductors of the heating coil installed in the heating coil, the quenching liquid injected from the quenching liquid injection pipe toward the bottom of the cam groove into the cam groove is heated. Since both the hardened surfaces heated by passing between the conductor and the hardened surfaces are cooled, a hardened layer having a uniform depth is formed on both hardened surfaces in a short time.

In addition, at the time of this quenching, a plate-shaped quenching liquid blocking member having a shape corresponding to the cross-sectional shape of the cam groove is provided in the cam groove on both sides of the heating coil via a spacer on the heating coil. Since the quenching liquid is prevented from scattering, the quenching liquid blocking member functions as a weir for the quenching liquid, so that more quenching liquid passes through both quenching surfaces. As a result, the cooling effect on both hardened surfaces is improved, and both hardened surfaces are completely quenched at the same time.

In the induction hardening device for a cam groove of a cylindrical cam according to a second aspect of the present invention, when the cylindrical cam is arranged such that its axis is vertical, it is formed substantially on the outer peripheral surface of the cylindrical cam. Induction hardening for the cam groove of a cylindrical cam that quenches the first both side surfaces within a predetermined range on both sides of the lowest point of the annular cam groove having a rectangular cross section and the second side surfaces within a predetermined range on both sides of the uppermost point. A quenching coil body according to claim 1, which is a device, which is similar to the quenching coil body according to claim 1 and which simultaneously and completely quenches both first side surfaces. The second quenching coil body that completely quenches both second side surfaces at the same time, and the first quenching coil body in which the first quenching coil body is inserted near the lowest point of the cam groove and is also pulled out. A second quenching coil body in which the moving device and the second quenching coil body are inserted and pulled out near the uppermost point of the cam groove. And a moving device.

Therefore, the first and second side surfaces are simultaneously and completely quenched by the first and second quenching coil bodies, respectively, so that all the hardened surfaces of the cylindrical cam are completely and simultaneously quenched. As a result of being inserted, the overall quenching work time of a large number of columnar cams is shortened, which not only contributes to the cost reduction of the quenching work, but also of the hardened layer formed in the cam grooves of these columnar cams. The depth is uniform.

[Brief description of drawings]

FIG. 1 is a front explanatory view of a quenching coil body according to an embodiment of the present invention, in which both sides of a predetermined range on both sides of the lowest point of a cam groove are quenched.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view taken along the line DD of FIG.

6 is a cross-sectional view taken along the line EE of FIG.

FIG. 7 is a cross-sectional view taken along the line FF of FIG.

8 is a sectional view taken along the line GG in FIG.

9 is a cross-sectional view taken along the line HH of FIG.

10A is a plan view of a spacer, and FIGS. 10B and 10C are cross-sectional views taken along line JJ and KK of FIG. 10A, respectively.

FIG. 11 is a schematic perspective view of a heating coil.

FIG. 12 is a front view of a quenching coil body for quenching both side surfaces within a predetermined range on both uppermost points of the cam groove.

FIG. 13 is a plan view of the induction hardening apparatus.

FIG. 14 is a perspective view of a cylindrical cam that is a work.

15 is a sectional view taken along the line MM of FIG.

[Explanation of symbols]

 100, 200 Quenching coil body 111, 112, 113, 211, 212, 213 Heating conductor 111a Cutting point 114, 115 Connecting conductor 116, 117, 216, 217 Lead conductor 121, 122, 221, 222 Core 130, 230 Quenching Liquid injection pipe 140 Spacer 150, 250 Quenching liquid blocking member 180, 280 Quenching coil moving device 300 Cylindrical cam 301 Outer peripheral surface 302 Cam groove 303 Upper side surface 304 Lower side surface 305 Bottom surface 306 Bottom point 307 Top point 308a ~ 308d Hardened surface

Claims (2)

[Scope of utility model registration request] 1. An induction hardening coil body for a cam groove of a cylindrical cam, wherein both side surfaces of a part of the cam groove having a substantially rectangular cross section formed on the outer peripheral surface of the cylindrical cam are simultaneously quenched. A pair of heating conductors having a shape corresponding to the shape of the both side surfaces and arranged so as to approach and face the both side surfaces,
Heating having a pair of connecting conductors formed in a substantially arc shape so as to connect both ends of each of the heating conductors and away from the cam groove, and a pair of lead conductors connected to a cut point of the heating conductor. A coil, a magnetic core attached to a heating conductor, a quenching liquid injection pipe attached to the core so that the tip faces the bottom surface of the cam groove, and the heating coil attached to both ends of the heating coil. A pair of spacers for keeping the distance between the conductor and the both side surfaces constant, and a pair of spacers formed in a substantially rectangular shape corresponding to the cross-sectional shape of the cam groove, supported by the spacers, and arranged in the cam groove. An induction hardening coil body for a cam groove of a cylindrical cam, comprising: a pair of quenching liquid blocking members for blocking the quenching liquid injected into the groove. 2. A predetermined range on both sides of the lowest point of an annular cam groove having a substantially rectangular cross section formed on the outer peripheral surface of a cylindrical cam when the cylindrical cam is arranged so that its axis is vertical. Is an induction hardening device for a cam groove of a cylindrical cam, which simultaneously quenches the first both side surfaces of the above and the second both side surfaces within a predetermined range on both sides of the uppermost point, and has a shape corresponding to the shape of the first both side surfaces. A pair of first heating conductors, which are arranged so as to be close to and opposite to the first both side surfaces, respectively, and both ends of the first heating conductors are connected to each other so as to be substantially arcuate so as to be away from the cam groove. A first heating coil having a pair of first connecting conductors formed and a pair of first lead conductors connected to a cutting point of the first heating conductor; and a magnetic body mounted on the first heating conductor. Mounted on the first core and the core so that the tip faces the bottom surface of the cam groove. And a pair of first spacers attached to both ends of the first heating coil to keep the distance between the first heating conductor and the both side surfaces constant, and It is formed in a substantially rectangular shape corresponding to the cross-sectional shape, is supported by the first spacer, is arranged in the cam groove, and blocks the quenching liquid injected into the cam groove.
A first induction hardening coil body including a pair of first quenching liquid blocking members, and a shape having a shape corresponding to the shapes of the second side surfaces, and arranged so as to approach and face the second side surfaces, respectively. Pair of second heating conductors, a pair of second connecting conductors that are formed in an arc shape so as to connect both ends of the second heating conductors and move away from the cam groove, and a second heating conductor. A second heating coil having a pair of second lead conductors connected to the cutting point, a second core of a magnetic body mounted on the second heating coil, and a tip facing the bottom surface of the cam groove. A second quenching liquid injection pipe attached to the core; and a pair of second spacers attached to both ends of the second heating coil to keep the distance between the second heating conductor and the both side surfaces constant. The cam groove is formed into a substantially rectangular shape corresponding to the cross-sectional shape of the cam groove, and It is supported from 2 spacer, which 塞止 baked liquid inlet injected disposed within the cam groove in the cam groove 1
A first induction hardening coil body provided with a pair of second quenching fluid blocking members, and a first hardening coil in which the first induction hardening coil body is inserted near the lowest point of the cam groove and pulled out. A cam moving groove for a cylindrical cam, comprising: a body moving device; and a second hardening coil moving device that inserts and pulls out the second induction hardening coil body near the uppermost point of the cam groove. Induction hardening equipment.