Piston for breaking hammer and manufacturing method thereof

Abstract

The invention provides a piston for a breaking hammer and a manufacturing method thereof, and belongs to the technical field of breaking hammers. The problem that an existing piston cannot simultaneously meet the hardness and the anti-friction performance is solved. According to the piston for the breaking hammer and the manufacturing method thereof, the piston comprises a piston main body, wherein the outer peripheral surface of the piston main body is provided with an annular positioning boss, wear-resistant sleeves are arranged at the positions, on the front side or / and the rear side of thepositioning boss, of the piston main body in a sleeving mode, the wear-resistant sleeves are positioned on the piston main body, the outer diameter of the wear-resistant sleeves is larger than the outer diameter of the positioning boss, and one end surface of each wear-resistant sleeve abuts against one end surface of the positioning boss. According to the structure, the anti-loosening performance of a nut is remarkably improved. When the outer peripheral surfaces of the wear-resistant sleeves in the structure rub with the inner wall of a cylinder body of the breaking hammer, the outer peripheral surfaces of the wear-resistant sleeves are not likely to wear, and then it is ensured that the piston cannot be broken in the process of striking a drill rod and the boss also has very good friction resistance, so that the piston is not likely to wear and tear, and the service life of the piston is prolonged.

Description

technical field [0001] The invention belongs to the technical field of breaking hammers, and relates to a piston, in particular to a piston for a breaking hammer and a manufacturing method thereof. Background technique [0002] The breaker is usually installed on the excavator, loader or power station. It has the advantages of large impact, convenient use, good mobility and high efficiency. It is mainly used for breaking, demolishing and excavating hard layers in construction. . For example, China Patent Network discloses a new type of hydraulic nitrogen combined action breaker [authorized announcement number: CN201695429U], which includes a front cylinder, a drill rod arranged in the front cylinder, a rear cylinder for storing nitrogen, a middle cylinder and a device. For the piston in the middle cylinder, the middle part of the piston is provided with two ring-shaped bosses at intervals from front to back. When the piston descends, the high-pressure oil in the rear workin...

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Problems solved by technology

[0004] Existing pistons for breaking hammers are made of 616V steel. After the pistons for breaking hammers of the above-mentioned patent are subjected to carburizing, quenching and finishing treatment by the above method, a hardened layer is formed on the outer peripheral surface of the piston. The surface hardness of the hardened layer is 58~62HRC (655~720HV), at this time, the hardness of the core of the piston is 38~42HRC, the hardness of the core of the piston makes it difficult to break when the head of the piston collides with the drill rod, but at this time the hardening on the outer peripheral surface of the piston The anti-friction performance of the layer is not very good. Generally, the hardness of the outer peripheral surface of the piston needs to be 1000HV to have good anti-friction performance. Therefore, the piston is still prone to strain.

[0005] In order to improve the anti-friction performance of the outer peripheral surface of the piston, what those skilled in the art generally adopt is to carry out nitriding treatment to the outer peripheral surface of the piston. Although this treatment method can make the hardness of the outer peripheral surface of the piston reach about 1000HV, due to the temperature of the nitriding treatment At about 530°C, the tempering temperature of the piston made of 616V steel is higher than 530°C. When the piston is tempered, the core hardness of the piston will decrease. When the core hardness of the piston is lower than 35HRC, Crack occurs when the head of the piston hits the drill rod

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