JPS5891124A - Manufacture of pulley - Google Patents

Abstract

PURPOSE:To obtain high wear resistance and long life by coating the surfaces and groove of a pulley and then turning the pulley, irradiating it with laser light having high energy density, and performing a hard surfacing heat treatment until hardness and hard surfaced layer depth have specific values. CONSTITUTION:After the surfaces and groove 1a of a pulley 1 are coated, it is turned by a rotating device 4. On the other hand, laser light 2a from a carbon dioxide gas laser oscillator 2 is converged through a lens 3 into laser light 2b with high energy density, which is allowed to irradiate the surfaces and groove 1a of the pulley 1, thus performing a hard surfacing treatment. A controller 5 supplies the laser oscillator 2 with a signal for specifying the laser light 2a and its generation time, and also inputs a signal for indicating the turning speed of the pulley 1 for heating up to prescribed hard surfaced layer depth to the rotating device 4. Thus, the hard surfacing treatment of the pulley 1 is carried out successively according to a previously set program.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Description of the Technical Field The present invention relates to a method for manufacturing a pulley, and more particularly to a method for manufacturing a pulley in which surfaces and grooves of the pulley are subjected to surface hardening heat treatment.

0) Description of the Prior Art As is well known, pulleys are in direct contact with belts made of steel, rubber, leather, etc. and transmit rotation through the friction generated on the contact surfaces, so the surfaces and grooves that come into contact with the belt are made of abrasion-resistant materials. It is desirable to have high durability and long life.

Usually, pulleys are often made of cast iron or cast steel. In cast products, the metal structure near the surface of the casting surface, where the cooling rate is faster, is most refined, so the W degree is high, but on the other hand, the internal hardness is low. Machining the groove exposes this least hard part,
This may cause wear. Furthermore, in order to increase hardness, conventional carburizing quenching or quenching that includes surface hardening treatment, such as induction quenching, requires a long time to complete quenching, which is not economical. Firing cracks occur due to immersion in coolants such as water or oil.
Also, the deformation is large. For this reason, the pulleys are used as they are after being cast and machined with their surfaces and grooves, which has the disadvantage of wearing out due to contact with the belt during use.

In particular, with V-belts compared to flat belts, the width of the groove is usually set so that the outer side of the belt matches the outer circumference of the pulley. Machining the grooves. This not only shortens the life of the belt, but also reduces the effective contact area and reduces rotational power transmission. Instead of a belt, a steel cable is often used as a belt for strong, high-speed transmission, but in this case, wear on other belts becomes even more significant.

(c) Purpose of the Invention In view of the above points, the present invention provides a pulley that can be rapidly surface hardened, has no quenching cracks, has extremely little deformation, has high shore abrasion resistance, has a long life, and has stable quality. The purpose is to provide a manufacturing method for.

(d) Structure of the Invention The present invention will be explained below based on one embodiment shown in the drawings. In order to achieve the above object, in the present invention, the first
The surface of the pulley 1 in contact with the belt and the groove 11 shown in FIGS.
It is characterized by performing surface hardening treatment.

FIG. 3 shows a specific configuration of the present invention, in which 2 a laser oscillator, 2 a laser beam generated by the laser oscillator 2, and 3
2b is a lens that focuses the laser beam 21 of the dove, 2b is the laser beam focused by this lens 3, 4 is a rotation device that rotates the pulley l, and 5 is a control device that controls this rotation device 4 and the laser oscillator 2. .

The laser oscillator 2 is a device that supplies the energy necessary to perform surface hardening treatment on the surface of the pulley 1 and the groove 1a, and has high efficiency (laser output/electrical input) and can be used with both pulsed waves and continuous waves. Use a carbon dioxide laser oscillator that is possible and has a large output.

佽) Invention Function The laser beam 2& generated by the laser oscillator 2 is focused by the lens 3 to an energy density that allows surface hardening treatment.

The rotating device 4 continuously rotates the pulley along the surface and groove to be surface hardened. The control device 5 controls the laser oscillator 2 by giving a signal instructing the laser beam and its generation time to the laser oscillator 2. Further, a signal instructing the rotational speed of the pulley 1 for heating to a predetermined depth of the hardened layer is input to the drive mechanism (not shown) of the rotating device f14. This causes the drive mechanism to operate, so that the pulley 1 is rotated according to a preset program and the surface hardening process is performed continuously.

As described above, the present invention has the following features: (1) The heating time with laser light is short, surface hardening can be performed quickly, and the heat is absorbed by the low-temperature materials.
Because it is rapidly cooled without using a coolant, there is very little deformation. Further, quench cracking does not occur.

(2) Since there is extremely little deformation, there is no need to use a finishing method after surface hardening treatment, and the product can be used as it is after being processed up to the final finishing step 1. With V-belts, there is no need to process grooves from the beginning in consideration of umbrella wear;
As a result, the life of the belt is significantly shortened, and the rotational transmission force is not reduced. Will not wear out even with steel cables (4) The width of the hardened layer in the surface hardening treatment can be changed by simply changing the laser light output and the distance between the lens and the pulley. All you have to do is change it. Therefore, it is extremely easy to set conditions, and the quality is stable.
Reproducibility is also good.

(f) Other Embodiments Although the present invention can be implemented in various modifications, for example, as shown in FIG. 4, a plurality of pulleys may be processed continuously. That is, in the figure, the laser beam 2b focused by the lens 3 continuously heats the surface of the pulley 1, and when the surface hardening treatment of one pulley is completed, the newly raised rotational movement The device 6 moves in the direction of the arrow, and then the next pulley is subjected to surface hardening treatment. 1. This allows a plurality of pulleys to be treated continuously, and the same effect as described above can be obtained.

Further, as shown in FIG. 5, when the pulley 1 is irradiated with the laser beam 2b at an angle, a deeper hardened layer depth can be obtained than when the laser beam 2b is irradiated perpendicularly to the bottom surface of the groove. Also, although not shown, the laser beam generated from the laser oscillator is divided into two parts by a shaped reflecting mirror, and the direction is changed along with ↓, and each laser beam is focused by a lens and illuminates both sides of the groove at the same time. Heat. This allows processing time to be halved.

Diagram 6 shows an example of a hardness distribution curve from the surface of cast iron after surface hardening treatment. The hardness near the surface is significantly higher than that of the interior, which has not been subjected to surface hardening treatment. The high hardness near the surface provides high wear resistance and long life.

1g) Effects of the Invention As described above, according to the present invention, surface hardening treatment can be carried out rapidly in a short period of time, deformation is extremely small, and quench cracking does not occur. Since there is very little deformation, it can be used as a product without the final finishing process. There is no need for processing to take account of wear from the beginning, and therefore the life of the belt is extended, and the rotational transmission force does not decrease. The conditions for surface hardening treatment are easy to set, the quality is stable, the reproducibility is good, and pulleys with high wear resistance and long life can be manufactured.

[Brief explanation of the drawing]

Enlarged views showing various examples of cross sections, FIG. 3 is an explanatory view showing a specific configuration of one embodiment of the present invention, FIG. 4 is a view showing another embodiment of the present invention, and FIG. FIG. 6 is a diagram showing an example of the hardness distribution curve from the surface of the pulley according to the present invention. 1... Pulley 1a... Surface and groove 2...
・Laser oscillator 2m, 2b...Laser beam 3...
Lens (7317) Agent Patent Attorney Nori Chika, Den Yu (
1 other person) Figure 1? Figure 4 surface: Ji's IQ [(,,,,Fl)

Claims (1)

[Claims] In a method for manufacturing a pulley which has a surface and grooves that engage with the belt and transmits rotation by friction generated on the contact surface with the belt, the surfaces and grooves are rotated after being coached, and a laser beam with a corresponding wave-high energy density is applied to the pulley. Hardness HR by irradiation
A method for producing a pulley, characterized in that a hardening heat treatment is performed on a surface of C40 or more and a hardened layer depth of 02cm or more and K11.