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Precision external spline pipe forming method

An external spline and precision technology, applied in the direction of metal extrusion dies, etc., can solve the problems of unfavorable mass production, low productivity and precision, and achieve the effects of reducing company costs, high processing efficiency, and meeting mass production requirements

Active Publication Date: 2014-07-23
JIANGSU SUNWAY PRECISION FORGING
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a precision external spline tube forming method, which overcomes the above defects, solves the problems of low productivity and precision, and is not conducive to mass production

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Embodiment 1

[0034] 1. Saw material. To choose a suitable hot-rolled bar material for sawing material, you must first select a hot-rolled bar material with a suitable specification. The outer diameter of the raw material must be larger than the outer diameter of the finished outer spline tube. path The material grade is 35, and the blanking length is 22mm.

[0035] 2. Spheroidizing annealing, the process is: the product is heated to 740°C with the furnace, kept for 3 hours, and then cooled to ≤500°C with the furnace and air-cooled. Furnace loading method: neatly placed vertically, the hardness after annealing is ≤80HRB. The spheroidizing annealing and the subsequent low-temperature annealing here refer to ordinary annealing, which can improve the structure and reduce the hardness.

[0036] 3. Turning the outer circle, also called blank making, refers to turning the outer circle to remove defects on the surface of the pipe. In this embodiment, the outer circle is turned to Ensure roug...

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Abstract

The invention provides a precision external spline pipe forming method. The method comprises the steps that hot rolling bars are sawn, spheroidizing annealing is conducted, and bars are formed through cylindrical turning; shot blasting is conducted on the bars, the bars are processed through phosphorus saponification, and workblank is formed; reverse extrusion, radial facing, chamfering, phosphorus saponification processing and external spline forward extrusion are conducted on the workblank, and the external spline pipe is obtained. According to the precision external spline pipe forming method, the precision external spline pipe can be produced through the common hot rolling bars, and the problem that external spline batch machining is difficult for multiple enterprises is solved. The precision external spline pipe formed by the method is compact in internal structure and stable in hardness number, and the surface smooth finish of the external splines is high and can be smaller than or equal to Ra1.6; in addition, the machining cost is low, machining efficiency is high, follow-up cutting machining amount is small, the requirement for batch production can be met, labor loss is saved, and the enterprise cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a precision external spline tube forming method. Background technique [0002] In the prior art, the processing methods of precision external spline tubes or sleeves mainly include the following methods: one is to adopt cutting processing methods such as milling and grinding. This type of processing method has low productivity and precision and is mainly used for single-piece small Batch production processing. The other is to use plastic deformation processing methods such as cold striking and cold rolling. The precision of cold striking is between milling and grinding, and the efficiency is about 5 times higher than that of milling. However, this method requires a special machine tool. A corresponding increase in production costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a precision...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21C23/03
CPCB21C23/085B21C23/20B21C25/02B21C25/025B21C37/158
Inventor 倪亚玲张骏龚爱军陈荣李明明
Owner JIANGSU SUNWAY PRECISION FORGING
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