JPH11207657A - Vibration generator body - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a body of a vibration generator with improved productivity. SOLUTION: A piston sliding member 2 having a piston sliding hole 4 into which a piston 10 is slidably fitted, and a working tool sliding having a working tool sliding hole 9 into which a chisel 11 is slidably fitted. This is a body made of a casting having a member 3 and having a hardened layer formed by gas nitrocarburizing in a piston sliding hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body of a vibration generator used for a crusher, a compactor, and the like.

[0002]

2. Description of the Related Art A piston having a piston sliding hole and a working tool sliding hole, a piston fitted into the piston sliding hole of the body, and a chisel fitted into the working tool sliding hole of the body are provided. A crusher that hits a chisel by reciprocating a turret is known.

In the above-mentioned body, shape tolerances such as roundness and cylindricity are important in order for the piston and chisel to reciprocate smoothly. In addition, the wear resistance and hardness of the sliding hole are important because of the pitching by the chisel. With the chisel pitching described above, the moment the piston hits the chisel and the chisel hits a hitting party such as rock,
When a hitting surface of a hitting partner is not parallel, a radial force is applied to the chisel and the piston.

[0004] In order to satisfy the above, the conventional body is made of a material such as SCM material or S43C, and is subjected to carburizing and high-frequency heat treatment, and at the same time, is formed with a piston sliding hole and a working tool sliding hole. Finish polishing is performed after carburizing.

[0005]

The conventional body can have a strict final shape tolerance in order to finish after carburizing, but on the other hand, in order to perform all processing from the material, that is, for drilling a sliding hole, reciprocating a piston. Since all the oil passages and the like through which the pressure oil flows are machined, the machining process is large, and the amount of wasted material is large. In particular, since the oil passage is drilled from multiple directions, more processing steps are required, and it is difficult to form an oil passage having a complicated shape.

Accordingly, an object of the present invention is to provide a body of a vibration generator which can solve the above-mentioned problems.

[0007]

The first invention is directed to a piston sliding hole 4 into which a piston 10 is slidably inserted and a working tool sliding hole into which a working tool is slidably inserted. 9
And is made of casting, and a hardened layer is formed in the piston sliding hole 4 by a gas nitrocarburizing process.

According to the first aspect, since the piston sliding hole 4, the working tool sliding hole 9 and the like can be easily formed by using a core for forming an oil passage since they are made of casting, the process is simplified. This reduces the amount of wasted material, reduces the amount of wasted material, and can easily form an oil passage having a complicated shape, thereby improving productivity. Further, since a hardened layer is formed in the piston sliding hole 4 by gas nitrocarburizing, the wear resistance is improved and the hardness is improved.

According to a second aspect of the present invention, in the first aspect, a piston sliding member 2 having a piston sliding hole 4 is provided.
And a body of a vibration generating device to which a working tool sliding member 3 having a working tool sliding hole 9 is connected.

According to the second invention, the piston sliding member 2 and the work implement sliding member 3 are separately manufactured by casting, so that the productivity is further improved and the gas softness of the piston sliding hole 4 is improved. The nitriding process becomes easier.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a body 1 has a member 2 for sliding a piston and a member 3 for sliding a working tool. The piston sliding member 2 has a piston sliding hole 4 and an oil passage 5 continuous in the longitudinal direction. A cap 7 is fixed to one end surface of the piston sliding member 2 in the longitudinal direction with bolts 8.

The work implement sliding member 3 has a work implement slide hole 9 which is continuous in the longitudinal direction. The work implement slide hole 9 and the piston slide hole 4 are concentric with each other. The moving member 3 and the piston sliding member 2 are connected.

A piston 10 is slidably fitted in the piston sliding hole 4 and a working tool, for example, a chisel 11, is slidably fitted in the working tool sliding hole 9 to form a crusher. ing. In FIG. 1, reference numeral 12 denotes a retaining pin for the chisel 11. If a rod of a pressing tool is inserted in place of the chisel 11, a pressing machine is obtained.

The piston sliding member 2 and the working tool sliding member 3 are made of a material having holes and oil passages by casting using cast iron, and after the material is annealed, the holes are finished and polished. A hardened layer is formed on each slider by gas soft nitriding.

[0015] As described above, by manufacturing the material by casting, each hole and oil passage can be easily formed by the core, the amount of wasted material is small, and a complicated oil passage can be easily formed. Can be formed. Moreover, since a hardened layer is formed on the surface of each hole by gas nitrocarburizing, the wear resistance is improved and the hardness is also improved.

In the above embodiment, both the piston sliding hole 4 and the work implement sliding hole 9 are subjected to gas nitrocarburizing.
The working tool sliding hole 9 does not necessarily need to be subjected to the gas nitrocarburizing treatment. In this case, since only the piston sliding member 2 can be placed in the furnace and subjected to the gas nitrocarburizing process, the operation is easy.

When the gas nitrocarburizing treatment is performed, the member may be distorted. If it is attempted to keep this distortion within the desired shape tolerance by finishing work again, the hardened layer due to gas nitrocarburization will be broken.

Therefore, the above-mentioned annealing treatment may be air-cooled after cooling at 350 ° C. in a furnace after holding at 700 ° C. for 3.5 hours and taking out from the furnace. By annealing in this way, the internal stress before the gas nitrocarburizing treatment (generated at the time of processing and material production) is removed, the distortion after gas nitrocarburizing is minimized, and the shape tolerance is improved. Therefore, there is no need for an essential final polishing step when machining from a material, and a body with a hardened layer remaining can be manufactured at low cost.

The body 1 may be integrated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration generator according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Body 2 ... Piston sliding member 3 ... Work implement sliding member 4 ... Piston sliding hole 5 ... Oil passage 9 ... Work implement sliding hole 10 ... Piston 11 ... Chisel (work implement)

Claims (2)

[Claims] 1. A piston sliding hole (4) into which a piston (10) is slidably inserted and a working tool sliding hole (9) into which a working tool is slidably inserted are concentrically provided. A body of the vibration generator, which is made of casting and has a hardened layer formed by gas soft nitriding in the piston sliding hole (4). 2. A cast piston slide member (2) having a piston slide hole (4) and a cast work tool slide member (3) having a work tool slide hole (9) are connected. The body of the vibration generator according to claim 1, wherein