JPH042648B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a remelted chill camshaft, and more specifically, the present invention relates to a method for manufacturing a remelted chill camshaft, and more specifically, a method of manufacturing a remelted chill camshaft by applying a laser beam, TIG arc, plasma arc, electron beam, etc. to the cam sliding part surface of the camshaft. The present invention relates to a method for manufacturing a remelting chill camshaft in which the scanning movement of the irradiated area by high-density energy is a uniform linear reciprocating movement so that the depth of the hardened surface layer due to remelting chilling becomes uniform.

[Conventional technology]

Conventionally, when forming a surface hardening layer by remelting and chilling the surface of the cam sliding part of the camshaft by irradiation with high-density energy such as a laser beam, TIG arc, plasma arc, or electron beam, the cam of the camshaft By moving the camshaft or high-density energy irradiation device in the cam width direction on the surface of the sliding part using a slider crank mechanism, etc., the irradiation area with high-density energy can be applied to the cam on the surface of the cam sliding part of the camshaft. It was usual to perform scanning by relatively reciprocating movement in the width direction.

However, when applying high-density energy to the surface of the cam sliding part of the camshaft using such a slider crank mechanism, the scanning movement of the irradiated area by the high-density energy follows a sine curve as shown in Figure 11. Because of this, the scanning speed of the area irradiated by high-density energy is high at the center of the cam width on the surface of the cam sliding part of the camshaft, and conversely, at both ends of the cam width on the surface of the cam sliding part of the camshaft, the scanning speed of the area irradiated with high-density energy is high. As shown in Fig. 12, the scanning speed of the irradiated area becomes slow, and the depth of the hardened surface layer formed on the surface of the cam sliding part of the camshaft due to remelting and chilling becomes uneven, as shown in Figure 12. .

In addition, if you try to ensure a uniform surface hardening layer depth by remelting and chilling by irradiating the surface of the cam sliding part of the camshaft with high-density energy using such a slider crank mechanism, It is necessary to increase the scanning speed of the irradiated area with high-density energy, and in this case, there is also the disadvantage that the depth of the hardened surface layer formed on the surface of the cam sliding part of the camshaft becomes extremely shallow due to remelting and chilling. .

Furthermore, if an attempt is made to form a deep surface hardening layer at the center of the cam width on the surface of the cam sliding part of the camshaft, the surface formed by remelting and chilling will form at both ends of the cam width on the surface of the cam sliding part of the camshaft. The depth of the hardened layer may become excessive, or the corners may melt away, causing so-called "melting drips".
At present, it has not been possible to obtain a remelted chill camshaft with sufficient quality and cost.

[Problem to be solved by the invention]

In view of the current state of the conventional technology as described above, the problem to be solved by the present invention is to irradiate the surface of the cam sliding part of the camshaft with high-density energy using a conventional slider crank mechanism, etc. In the method of forming a surface hardening layer on the surface of the sliding part of the camshaft, the scanning motion of the irradiated area by high-density energy on the surface of the cam sliding part of the camshaft is a sine curve motion. At the center of the cam width, the scanning speed of the area irradiated by high-density energy is fast, and conversely, at both ends of the cam width on the cam sliding surface of the camshaft, the scanning speed of the area irradiated by high-density energy is slow, and the scanning speed of the area irradiated by high-density energy is slow. It was difficult to uniformize the depth of the hardened surface layer formed by remelting and chilling the surface of the cam sliding part of the camshaft by irradiating the camshaft.

Therefore, the technical problem of the present invention is to
By making the scanning motion of the irradiated area by high-density energy on the surface of the cam sliding part of the camshaft into a uniform linear reciprocating motion, it is formed by remelting and chilling the surface of the cam sliding part of the camshaft due to the irradiation of high-density energy. The object of the present invention is to facilitate uniformity of the depth of the hardened surface layer, thereby ensuring excellent quality and cost of the remelted chill camshaft.

[Means to solve the problem]

In view of these problems with conventional technology,
The means for solving the conventional problems in the present invention is to irradiate the surface of the cam sliding part of the camshaft with high-density energy such as a laser beam, TIG arc, plasma arc, or electron beam to remelt and chill the cam of the camshaft. A method for manufacturing a remelted chill camshaft in which a hardened surface layer is formed on the surface of a sliding part of the camshaft. The method of manufacturing a remelted chill camshaft is characterized in that the remelting chill camshaft is produced by a uniform linear reciprocating motion in a direction in which the motion components are combined.

[Effect]

Hereinafter, the operation of the present invention will be explained based on the accompanying drawings.

In FIG. 1, the scanning motion of the irradiated area by high-density energy with respect to the cam sliding part surface 4a of the camshaft 3 is divided into an axial motion component of the camshaft 3, that is, a reciprocating motion of the camshaft 3, and a circumferential motion component, that is, This is a uniform linear reciprocating motion in the direction that combines the rotational motion of the camshaft 3, and by making this uniform linear reciprocating motion, the scanning motion does not become a sine curve motion as in the past.
Since there is no difference in scanning speed depending on the cam width portion, the depth of the hardened surface layer formed on the surface 4a of the cam sliding portion of the camshaft 3 can be easily made uniform.

FIG. 3 shows a cam profile of the copying cam 1 for deriving the reciprocating motion of the three axes of the camshaft. The tracing stylus here refers to a stylus used to trace a machining profile when machining a workpiece.

The copying cam 1 has a predetermined base circle 1a large enough to accommodate at least one cam lift portion 1b, with the base circle of the copying cam 1 as the base and the cam sliding portion surface 4a of the camshaft 3 A cam lift portion 1b is formed whose apex is a cam lift corresponding to the irradiation width by high-density energy. When the camshaft 3 and the high-density energy irradiation device 8 undergo relative reciprocating motion and the camshaft's three axes rotate, the camshaft 3 and the camshaft 3 or the high-density energy irradiation device are arranged at the equilateral portions of the cam lift portion 1b and the camshaft 3 or the high-density energy irradiation device. The reason why the cam profile is formed by making the locus drawn by the contact point with the copying stylus correspond to the rotation angle of the copying cam 1 is that the camshaft 3 is attached to the copying cam 1 having the cam profile drawn as described above. Alternatively, by driving the copying stylus of the high-density energy irradiation device 8 to copy and drive the copying cam 1.
The rotation of the camshaft 3 or the high-density energy irradiation device 8 is reciprocated along the equilateral parts of the cam lift section 1b, and by combining this with the rotational motion of the 3 axes of the camshaft, a scanning motion on the surface of the cam sliding section 4a is achieved. can be moved linearly and reciprocally at a constant speed, and a uniform hardened surface layer 4b as shown in FIG. 5 can be formed by remelting and chilling the cam sliding portion surface 4a of the camshaft 3 in the cam width direction. ing.

Next, FIG. 4 shows the scanning movement of the irradiated area by high-density energy on the cam sliding part surface 4a of the camshaft 3, which is formed by driving the camshaft 3 or the high-density energy irradiation device 8. It is understood that the scanning motion of the irradiated area by high-density energy is a uniform linear reciprocating motion.

FIG. 5 shows the cam sliding part surface 4 of the camshaft 3.
By making the scanning movement of the irradiated area by high-density energy a uniform linear reciprocating motion in step a, the scanning movement of the irradiated area by high-density energy is made into a uniform linear reciprocating motion with respect to the cam sliding part surface 4a of the camshaft 3. A cross-sectional view of the cam 4 when the hardened surface layer 4b is formed by remelting and chilling is shown as the movement.

In FIG. 5, 4 indicates a cam, and 4b indicates a hardened surface layer formed by irradiating high-density energy according to the method of the present invention.

As is clear from FIG. 5, by making the scanning motion of the irradiated area by high-density energy with respect to the cam sliding portion surface 4a of the camshaft 3 into a uniform linear reciprocating motion as shown in FIG. It is understood that the depth of the hardened surface layer 4a formed by irradiating the surface 4a of the cam sliding portion of No. 3 with high-density energy and remelting and chilling is made uniform.

Note that the copying cam 1 may be a plate cam having the outer shape of the cam profile as described above, or a so-called plate cam having the profile as described above in the groove shape formed on a plate member, cylindrical member, etc. , may be a grooved cam.

However, when performing uniform linear reciprocating motion at a high speed, it is desirable to use a grooved cam to imitate a camshaft or a high-density energy irradiation device from the viewpoint of followability of the stylus.

〔Example〕

Embodiments of the present invention will be described below based on the accompanying drawings.

In addition, in the following embodiments, the same or corresponding parts are given the same reference numerals and the explanation will be omitted.

(First Example) FIGS. 1 and 2 show that a surface hardening layer 4b is formed by remelting and chilling on the cam sliding part surface 4a of a camshaft 3 by the method of manufacturing a remelting chill camshaft of the present invention. A first embodiment is shown.

FIG. 1 shows that the cam sliding part of the camshaft 3 is fixed by fixing the high-density energy irradiation device and moving the camshaft 3 in a straight line reciprocating motion at a constant speed using a direct drive method as shown in FIG. An example is shown in which a hardened surface layer 4b is formed on the surface 4a by remelting and chilling.

In the direct drive system shown in FIG. 1, the camshaft 3 is held by the holding members 5 and 6 of the camshaft 3, and one end of the holding member 6 is held by a holding member (not shown), and a A roller 7 that rolls and moves as a stylus is provided, and when a high-density energy irradiation device 8 such as a TIG arc torch is fixed, in addition to the rotational movement of the camshaft shaft, the copying cam 1 is moved in the direction of the arrow 9. By rotating the camshaft 3 to reciprocate in the direction of the arrow 10, the camshaft 3 is moved linearly reciprocally at a constant speed with respect to the irradiation device 8, and the cam sliding part surface 4a of the camshaft 3 is hardened by remelting and chilling. This is to form the layer 4b.

In addition, in the link drive method shown in FIG. 2, the cam profile of the plate-shaped copying cam 1 whose external shape is a cam profile is controlled by the copying pin 11 as a copying stylus provided at one end of the link member 12. By tracing, the other end side of the link member 15 of the link member 12 and the link member 15 which are rotatably provided through the pin hole 13 into which a support member (not shown) is inserted and are connected by the fixing pin 14. TIG (not shown) located in
By irradiating high-density energy from a high-density energy irradiation device 8 such as a torch, a hardened surface layer 4b is formed on the surface 4a of the cam sliding portion of the camshaft 3 by remelting and chilling.

(Second Example) FIG. 6 is a diagram showing a second example of manufacturing a remelted chill camshaft by the method of the present invention.

In FIG. 6, the frame 21 is slidable in the direction of arrow 10, and a motor 24 for rotationally driving a holding member 6 that holds one end of the camshaft 3 is disposed at one end, and another holding member 6 is provided at the other end. A member 5 is provided, a roller 22 is rotatably fixed to the frame 21, and a copying cam 23a is rotationally driven by a motor 25.

Then, the roller 22, which is a stylus, copies the groove 26 of the copying cam 23a, causing the frame 21 to move back and forth linearly at a constant speed.

Therefore, in FIG. 6, the motor 2 is rotated while the camshaft 3 is held by the holding members 6 and 5.
On the other hand, the copying cam 23a is rotated by the motor 25 and the groove 26 of the copying cam 23a is rotated by the motor 25.
The roller 22 follows the arrow 10, and the camshaft 3 follows the arrow 10.
By rotating while reciprocating in the direction, the camshaft 3 moves linearly reciprocating at a constant speed with respect to a high-density energy irradiation device such as a TIG torch (not shown) that is in a fixed state, and the cam sliding portion surface 4a of the camshaft 3 is remelted and chilled to form a surface hardened layer 4b.
is formed.

As mentioned above, the speed pattern of the uniform linear reciprocating motion is determined by the groove shape of the copying cam 23a, and
Since there is almost no play between the roller 22 and the roller 22, the roller 22 accurately follows the groove shape of the copying cam 23a, and the uniform linear reciprocating motion of the camshaft 3 reliably moves at the set speed.

Moreover, since the shape of the groove 26 of the copying cam 23a can be processed into any shape, the speed pattern of the uniform linear reciprocating motion can be arbitrarily set.

FIG. 8 is a developed view of the copying cam 23a shown in FIG.

(Third Example) FIG. 7 is a diagram showing a third example of manufacturing a remelted chill camshaft by the method of the present invention.

In FIG. 7, the holding method of the camshaft 3 is the same as that in FIG. 6, and the copying cam 23 is
b is a disc in which a cam profile is formed in the form of a groove.

The copying cam 23b is rotated by the motor 25, and the groove 26 of the copying cam 23b is rotated by the roller 2.
2 follows and causes the frame 21 to reciprocate.

Since the groove width of the groove 26 is almost equal to the roller width of the roller 22 and there is almost no backlash, the reciprocating movement of the camshaft 3 is reliably repeated at the same speed as the reciprocating movement of the groove shape of the copying cam 23b.

When the camshaft 3 is rotated by the motor 24, the camshaft 3 can perform uniform linear reciprocating motion with respect to the irradiation device by a composite motion of the rotational motion of the camshaft 3 axes and the reciprocating motion of the camshaft 3 axes, A uniform hardened surface layer can be formed on the surface 4a of the cam sliding portion of the camshaft 3.

FIG. 9 shows the groove shape of the copying cam 23b on the disc shown in FIG.

Fig. 10 shows the cam 4 of the camshaft 3 indicated by the arrow 2.
While rotating in 8 directions, the high-density energy irradiation device 8 of the TIG torch is reciprocated in the direction of arrow 10 while following the shape of the copying cam 23b. Trajectory 27 of uniform linear reciprocating motion of the irradiated area due to energy
FIG. 7 is a detailed view showing the operating state of the high-density energy irradiation device in manufacturing the remelted chill camshaft shown in FIGS. 6 and 7. FIG.

As is clear from the above, according to the second and third embodiments, the scanning movement of the irradiated area by high-density energy with respect to the cam sliding portion surface 4a of the camshaft 3 is carried out by the thin film of the copying cams 23a, 23b, etc. By using a cam, it is possible to reliably perform a uniform linear reciprocating motion with a targeted speed pattern, so that the hardening depth of the surface hardened layer 4b can be made uniform, and the quality of the remelted chill camshaft is stabilized. be.

In the second and third embodiments described above, the camshaft 3 is moved linearly and reciprocally at a constant speed, but the high-density energy irradiation device 8, such as a TIG torch, is moved by the copying cams 23a and 23b. , it goes without saying that the same effect can be obtained even by performing uniform linear reciprocating motion.

〔Effect of the invention〕

As is clear from the above, according to the method for manufacturing a remelted chill camshaft according to the present invention, the scanning motion of the irradiated area by high-density energy with respect to the cam sliding part surface of the camshaft is made into a uniform linear reciprocating motion. , it is possible to easily equalize the depth of the hardened surface layer formed by remelting and chilling the surface of the cam sliding part of the camshaft by irradiation with high-density energy, thereby improving the quality and cost of the remelting chill camshaft. There are advantages that can be secured.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a method for manufacturing a linear drive type remelting chill camshaft, which is one of the first embodiments of the method of the present invention, and Fig. 2 is one of the first embodiments of the method of the present invention. Figure 3 is a diagram showing a link drive method for manufacturing a remelting chill camshaft, and Figure 3 is a diagram showing a cam profile of a copying cam for making the scanning movement of the irradiated area by high-density energy into a uniform linear reciprocating movement according to the method of the present invention. , FIG. 4 is a diagram showing the scanning movement of the irradiated area by high-density energy with respect to the surface of the cam sliding part of the camshaft according to the method of the present invention, and FIG.
The figure is a cross-sectional view of a cam remelted and chilled by the method of the present invention, FIG. 6 is a diagram showing a method for producing a remelted chill camshaft according to the second embodiment of the method of the present invention, and FIG. FIG. 8 is a developed view of the copying cam used in the second embodiment, and FIG.
A plan view of the copying cam used in the third embodiment, FIG. 10 is a diagram showing a state in which high-density energy is irradiated to the cam sliding diagram surface of the camshaft by the method of the present invention, and FIG. FIG. 12 is a cross-sectional view of a cam that has been remelted and chilled by the conventional method. 1... Copying cam, 1a... Base circle, 1b...
Cam profile, 2... Rotating shaft, 3... Camshaft, 4... Cam, 4a... Cam sliding part surface, 4
b...Surface hardening layer, 5, 6...Holding member, 7...
Roller, 8...High-density energy irradiation device, 9...
... Rotation direction, 10 ... Movement direction, 11 ... Copying pin, 12 ... Link member, 13 ... Pin hole, 14
... Fixed pin, 15 ... Link member, 21 ... Frame, 22 ... Roller, 23a, 23b ... Copying cam, 24, 25 ... Motor, 26 ... Groove, 2
7... Trajectory of irradiated area by high-density energy, 2
8... Rotation direction of the camshaft, 29... Movement direction of the high-density energy irradiation device.

Claims (1)

[Claims] 1. The surface of the cam sliding part of the camshaft is irradiated with high-density energy such as a laser beam, TIG arc, plasma arc, electron beam, etc. to re-melt and chill the surface of the cam sliding part of the camshaft, thereby hardening the surface of the cam sliding part of the camshaft. A method for manufacturing a remelted chill camshaft in which a layer is formed, wherein the scanning motion of the irradiated area by high-density energy with respect to the cam sliding part surface of the camshaft is performed in a direction that is a combination of an axial motion component and a circumferential motion component of the camshaft. A method for manufacturing a remelting chill camshaft characterized by constant linear reciprocating motion.