Dual gear and machining process for same

Abstract

The invention discloses a dual gear and a machining process for the same. The dual gear comprises a metal gear which is integrally formed on a metal gear shaft. A plastic gear and the metal gear are coaxially assembled on the metal gear shaft. The plastic gear comprises polyamide 66 and 33 percent fiberglass. The machining process comprises the following steps of: machining a metal gear shaft blank, and machining the metal gear on the gear forming section of the metal gear shaft by using a generating method; coaxially assembling a plastic gear blank on the metal gear shaft by using an injection molding process; and machining the plastic gear on the plastic gear blank by using the generating method. In such a way, the 33 percent fiberglass is added into the conventional plastic gear, so that the performance of the plastic gear is greatly improved; and the machining process is optimized, and the gears are machined by the generating method, so that the gear has a high lubricating property, high abrasion resistance, low noise and higher tooth profile, tooth alignment and radial run-out accuracy.

Description

technical field [0001] The invention relates to the field of gear processing, in particular to a dual gear and its processing technology. Background technique [0002] According to historical records, as far back as 400-200 BC, ancient China began to use gears. The bronze gear unearthed in Shanxi, my country is the oldest gear discovered so far. As a guide car reflecting the achievements of ancient science and technology, the gear mechanism The core mechanism. At the end of the 17th century, people began to study the shape of gear teeth that can correctly transmit motion. In the 18th century, after the European Industrial Revolution, the application of gear transmission became more and more extensive; first, cycloid gears were developed, and then involute gears were developed. Involute gears use the principle of generative cutting to process metal gears. The emergence of special machine tools and cutting tools utilizing this principle has developed rapidly. After the end ...

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Problems solved by technology

[0008] Congenital defect of nylon gear compared with metal gear: low strength

Use an injection molding machine to mold nylon gears directly through mold injection. The mold cannot form a theoretical involute. In addition to the difference in injection molding process, the injection molded nylon gear tooth shape, tooth direction and other precision, radial runout accuracy, etc. cannot be compared with traditional development. Compared with metal gears machined by method hobbing

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