JPH0531037U - Switchgear sliding parts - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the manufacturing process and reduce manufacturing costs. [Structure] Sliding parts 10 on the outer peripheral surface are minute grooves along the circumferential direction
Provide 11. The fine groove 11 is formed by applying or printing a black body paint on a portion of the outer peripheral surface where the fine groove 11 is not provided, irradiating a laser beam to form a hardened portion, and grinding the outer peripheral surface by buffing or dry honing. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a linear sliding shaft used in an opening / closing device, a sliding member that moves in the axial direction such as a valve element in a hydraulic operating device.

[0002]

[Prior Art]

 As is well known, in the so-called linear sliding guide part that slides while preventing positional displacement in the direction orthogonal to the axial direction, when different materials are used for the shaft side and bearing side, or when the same type of material is used. Applies a surface treatment or heat treatment to one member to make the surface hardness higher than the other member to give a difference in surface hardness between the two members, and lubricate them with lubricating oil or grease. The generally adopted technical method is to use an agent. FIG. 8 shows an example of this, 1 is a rod on the shaft side, 2 is a bearing, and 3 is a grease reservoir provided on the bearing 2. Reference numeral 4 indicates the sliding direction of the rod 1.

On the other hand, in high-precision parts such as hydraulic circuit parts, high-precision bearings, etc., a coaxial groove is provided to prevent eccentricity of the gap between the shaft side and the bearing side. Technical measures have been adopted to equalize the difference in hydraulic pressure. FIG. 9 shows an example of this, 5 is a valve element on the shaft side, 6 is a valve guide on the bearing side, and 7 is a groove that serves to prevent oil shortage and eccentricity.

These technical means reduce direct contact of the respective sliding surfaces, collect fine powder (hereinafter referred to as sliding powder) generated by the sliding contact into the groove, and use the sliding powder to remove the fine powder. It has been used to prevent secondary wear and lubricant runout.

[0005]

[Problems to be solved by the device]

 However, of the above technical measures, the groove processing and surface hardening to prevent sliding powder recovery and lubricant runout are (1) Part shape processing → (2) Part heat treatment of unnecessary parts → (3) Heat treatment of parts → (4) Removal work of heat treatment residue → (5) Surface finishing by grinding etc. → (6) Removal of grinding burrs, etc. Therefore, it requires an extremely large number of steps in the processing of parts, which has a great impact on the economics of part manufacturing. Therefore, an object of the present invention is to provide a sliding part for an opening / closing device that simplifies the processing steps and can significantly reduce the manufacturing cost.

[0006]

[Means for Solving the Problems]

 According to the present invention, a sliding component of an opening / closing device that slides in the axial direction while being restrained in position by another member is provided with a minute recess formed by a partial heat treatment and grinding means on the outer peripheral surface thereof.

[0007]

[Action]

 Grooving, which was conventionally provided by machining, is designed to make minute recesses on the outer peripheral surface by utilizing the difference in hardness due to partial heat treatment and the difference in machinability, so the number of machining processes can be reduced compared to the past. It can be simplified and the production cost can be significantly reduced.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is an enlarged view of an "A" portion in FIG. In FIGS. 1 and 2, reference numeral 10 denotes a sliding component, and a minute groove 11 having a smooth curved surface is provided on the outer peripheral surface of the sliding component 10 along the circumferential direction.

Next, a processing procedure of the sliding component 10 will be described. First, after the outer shape of the material is processed, black body paint is applied or printed on the outer peripheral surface along the circumferential direction at a desired width and pitch. After that, laser hardening is performed by laser irradiation. FIG. 3 shows the hardened portion 12a by laser hardening, and the hardened portion 12a and the non-hardened portion 13a are formed in a striped pattern. The hardness distribution of the hardened portion 12a and the non-hardened portion 13a is shown in cross section in FIG. In the figure, the numeral 100 indicates 100% hardness and the numeral 0 indicates hardness of the base metal. After laser hardening, grind with a buff or a rubber whetstone to remove the blackbody paint and form irregularities. When the surface is ground with a buff or a rubber whetstone, the unevenness has a small amount of removal by the hardened portion 12a by grinding as shown in Fig. 5, but a large amount of removal 14 by the grinding of the non-hardened portion 13a. Unevenness occurs according to the hardness difference. After this, make final dimensional adjustments. The application or printing of the above-mentioned black body paint can be carried out by controlling the laser beam or by controlling the partial irradiation time depending on the size of the sliding parts, as long as the hardness difference can be generated. The whole may be applied or printed to blacken it, or conversely, the whole may not be applied or printed at all to be blackened. As is well known, black body paint is applied or printed in order to improve the heat absorption effect. On the contrary, a reflection film of the laser beam by copper plating is formed on the part (non-cured part 13a) that prevents heat absorption. You may. Further, the difference in the irradiation energy amount may be partially caused by the weaving of the laser beam, the adjustment of the focus, the length of the irradiation time, the overlapping of the irradiation ranges, and the like.

Therefore, according to the embodiment configured as described above, when laser hardening is performed, the black body paint is applied or printed only on the portion of the material that requires high hardness after the outer shape processing, or A hardness difference can be generated by controlling the laser beam, etc., and then a minute groove can be formed by grinding with a buff or a rubber grindstone, etc., which not only simplifies the manufacturing process by reducing the number of steps, but also allows sliding. The hardness difference pattern can be arbitrarily selected according to the application of the part, and the unevenness difference can be arbitrarily selected depending on the grinding material and the grinding conditions. In addition, since the uneven interface is formed extremely smoothly, the contact angle with the mating (bearing side) surface is an obtuse angle, and the cutting angle during sliding is close to zero compared to the case of conventional cutting. The sliding powder is small and small, and smooth sliding is possible.

In the embodiment described above (hereinafter referred to as the first embodiment), the hardened portion 12a is formed in order to form the fine groove 11 by laser hardening, but carburizing hardening may be used instead. Good. Hereinafter, a processing procedure of another embodiment (hereinafter referred to as a second embodiment) using carburizing and quenching will be described. First, after the outer shape of the material is processed, the carburizing inhibitor is applied or printed on the outer peripheral surface in a desired width and pitch along the circumferential direction. After this, carburize and quench. Also in this embodiment, similarly to the case of the laser hardening shown in FIG. 3, the hardened portion 12a and the non-hardened portion 13a are formed in a striped pattern. The cross section of the hardened portion 12a and the non-hardened portion 13a is as shown in FIG. After quenching, temper as needed. After this, when the surface is ground with a buff, dry honing or a rubber grindstone, as shown in FIG. 5, the hardened portion 12a has a small removal amount due to grinding and the non-hardened portion 13a has the removed amount as shown in FIG. Since 14 is increased, unevenness inevitably occurs according to the hardness difference. After this, if necessary, the outer shape is corrected and finish-ground. It should be noted that the above-mentioned application or printing of the carburizing inhibitor may be carried out only on the portion where low hardness is desired when carburizing and quenching the whole. Further, in quenching, a coil having a large heat capacity is wound around the surface of a shaft or the like, whereby the surface contact portion becomes a low hardness portion due to the difference in cooling speed. Also in the second embodiment described above, the same effect as in the first embodiment described above can be obtained.

Further, in the above-described first and second embodiments, the respective hardened portions 12a are independently formed along the circumferential direction, but as shown in FIG. 6, the hardened portions 12b are formed along the circumferential direction. Alternatively, the hardened portion 12c may be formed in a polka dot pattern as shown in FIG. Further, although buffing, dry honing, or a rubber grindstone was used for grinding in the above-mentioned first and second embodiments, a high-elasticity grindstone using a resin binder may be used, and abrasive grains may be jetted. Good.

[0013]

[Effect of the device]

 As described above, according to the present invention, heat treatment is applied to a necessary portion after the outer shape processing of the material, the heat treatment residue is removed and fine irregularities are generated by the grinding process performed thereafter, and the fine irregularities cause the outer periphery to be removed. Since the micro-grooves are formed on the surface, it is not necessary to process a complicated shape in the previous process, eliminating the work of removing only the heat treatment residue that occurs when heat-treating a component with a complicated shape, simplifying the processing process. Therefore, it is possible to provide the sliding parts of the switchgear whose manufacturing cost is significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of an “A” part in FIG.

FIG. 3 is an explanatory view showing a hardened portion and a non-hardened portion formed in a heat treatment step in the processing of one embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a hardness distribution of a hardened portion and a non-hardened portion shown in FIG.

FIG. 5 is an explanatory view showing that minute irregularities are formed in a grinding process in the processing of one embodiment of the present invention.

FIG. 6 is an explanatory view showing different shapes of the hardened portion and the non-hardened portion formed in the heat treatment step in the processing of the embodiment of the present invention from those in FIG. 3;

FIG. 7 is an explanatory view showing different shapes of the hardened portion and the non-hardened portion formed in the heat treatment step in the processing of the embodiment of the present invention, which are different from FIGS. 3 and 6.

FIG. 8 is a cross-sectional view showing the structure of a conventional bearing that makes linear sliding contact.

FIG. 9 is a cross-sectional view showing a configuration of a conventional valve body for a hydraulic operating machine.

[Explanation of symbols]

10 ... Sliding parts, 11 ... Minute grooves, 12a, 12b, 12c ... Hardened part, 13a, 13b, 13c ... Non-hardened part, 14 ... Deleted amount.

Claims (1)

[Scope of utility model registration request] 1. A sliding part of an opening / closing device that slides in an axial direction while being restricted in position by another member, characterized in that a minute recess is formed on the outer peripheral surface by a partial heat treatment and grinding means. Sliding parts of equipment.