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High-precision machining method for valve element of floating ball type drain valve

A processing method, floating ball technology, applied in metal processing equipment, manufacturing tools, honing tools, etc., can solve the unqualified airtightness of the valve core and valve seat, the difficulty of ensuring coaxiality, and the reduction of the trap assembly yield, etc. question

Active Publication Date: 2021-01-22
常州艾肯智造科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practice, such expectations often come to nothing. Due to the insufficient processing precision of the valve core, it is difficult to ensure the coaxiality of the valve stem and the two valve cores during the assembly of the steam trap in the factory, and there is a gap between the valve core and the valve seat. The air tightness is unqualified, which reduces the trap assembly yield
What's more troublesome is that although some steam traps passed the inspection in the factory, the airtightness problem was exposed after a period of service

Method used

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  • High-precision machining method for valve element of floating ball type drain valve
  • High-precision machining method for valve element of floating ball type drain valve
  • High-precision machining method for valve element of floating ball type drain valve

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Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The processing of the spool 100 is relatively difficult, so the spool becomes a bottleneck restricting the assembly quality of the high-end double-spool steam trap. In the traditional process, after the inner hole of the valve core is finely bored, quenching treatment is performed, and then the taper surface 101 of the valve core is directly grinded on the cylindrical grinder. Generally speaking, the hardness of the spool after quenching is required to be HRC54-56 degrees. The spool 100 has a special-shaped structure, and the minimum wall thickness of the inner hole 102 of the spool is uneven, and the minimum wall thickness reaches 0.5 mm; the diameter of the inner hole 102 of the spool is very small, not exceeding 6 mm. Further studies have found that such a valve core with a small size and special-shaped structure is easily deformed after quenching,...

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Abstract

The invention discloses a high-precision machining method for a valve element of a floating ball type drain valve. The high-precision machining method comprises the following steps that S1, the valveelement is machined according to the size and shape of a drawing, a valve element inner hole is finely bored, and a valve element conical surface of the outer wall of the valve element is turned; S2,vacuum quenching treatment is performed; S3, honing is performed on the valve element inner hole; and S4, the inner surface of the valve element inner hole is used as the benchmark, and the conical surface of the valve element is ground on a cylindrical grinding machine. According to the high-precision machining method, honing treatment is conducted after the valve element is quenched, so that theobtained valve element inner hole is in a standard cylinder shape, and the high-precision inner diameter is obtained; and the valve element inner hole is used as a positioning reference for grindingthe conical surface of the valve element, so that the conical surface of the valve element has accurate roundness and the valve element inner hole has high coaxiality.

Description

technical field [0001] The invention relates to the field of steam traps, in particular to a high-precision machining method for a ball float type trap valve core. Background technique [0002] Float type double-spool steam trap consists of a float ball, a valve seat, a valve stem and two valve cores. The valve core is coaxially sleeved on the valve stem. The sealing state between the seats. [0003] In the traditional method, the raw material is turned into a valve core after turning, milling, boring, etc., and then the valve core is hardened, and the tapered surface is rounded with an external cylindrical grinder, in order to expect the tapered surface to be consistent with the The tapered surface of the seat hole is a tight fit. However, in practice, such expectations often come to nothing. Due to the insufficient processing precision of the valve core, it is difficult to ensure the coaxiality of the valve stem and the two valve cores during the assembly of the steam tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B24B1/00B24B33/02B24B33/08
CPCB23P15/001B24B1/00B24B33/02B24B33/082
Inventor 刘梦祥姜敏伟
Owner 常州艾肯智造科技有限公司
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