Shredding cutter and machining method thereof

Abstract

A machining method of a shredding cutter includes steps of (a) assembling blades on a cutter shaft to be machined, and pre-locating the blades on the cutter shaft by a clamp; (b) rolling or extruding the cutter shaft at positions between the blades by a rolling cutter, so that the cutter shaft between the adjacent blades is formed with embossed parts on two flanks of each of the blades; and (c) withdrawing the rolling cutter, and each of the blades being fixed on the cutter shaft by the embossed parts on the two flanks thereof. A shredding cutter machined by the machining method mentioned above includes a cutter shaft and a plurality of blades, the blades are arranged on the cutter shaft with a predetermined spacing, embossed parts are formed on the cutter shaft between the adjacent blades, and the blades are fixed between the embossed parts. The present invention has a strong unitary structure, high precision, high yield, which is beneficial to reduce the processing cost and the cost of materials.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a cutter for a shredder and a machining method thereof.BACKGROUND OF THE INVENTION[0002]Commonly, a conventional shredding cutter and its machining process include three types as following.[0003]First, a fixed way with spacing rings. As shown in FIGS. 1(a)-1(c), the cutter includes a cutter shaft 11, blades 12, spring retainers and spacing rings 14, wherein each blade 12 is fixed on the cutter shaft 11 between the adjacent spacing rings 14, and the cutter shaft 11 are fixed by two spring retainers retaining the cutter shaft 11 at opposite ends respectively. The advantages of this machining method of the cutter are that the process is simple and the operation is convenient. However, its disadvantages includes that (a) the cost of the total cutter is increased as the spacing rings are needed; (b) the assembly difficulty is increased since the spacing rings and the blades are superimposed each other, and both of them have thi...

AI Technical Summary

Benefits of technology

[0012]The present invention has the following advantages: (a) the unitary structure is strong similarly to the cutter formed by the unitary machining way; (b) no spacing rings are needed for fixing the blades, which improve the assembly precision and eliminate the cumulative tolerances generated in the assembly; and (c) no turning quantity generates, and the yield is increased, which reduces the processing cost and the cost of materials.

Problems solved by technology

However, its disadvantages includes that (a) the cost of the total cutter is increased as the spacing rings are needed; (b) the assembly difficulty is increased since the spacing rings and the blades are superimposed each other, and both of them have thickness tolerances, the small tolerances are finally cumulated to cause the spring retainers may not be assembled; (c) the spacing rings are easy to get broken since it can only stand a limited force.

However, its disadvantages include that (a) the cutter shaft can not stand a great torsion of the blades (compared to the polyhedral solid cutter shaft) since the cutter shaft is a hollow tube structure; (b) since the cutter shaft is a hollow tube structure as mentioned, thus the pressure it can stand is smaller than that of the solid cutter shaft.

However, its disadvantages are that (a) requirements of the turning process are quite high, the turning quantity is large, and the yield is low; (b) numbers of mechanical processing equipments are needed in the mass production, the rate of the quality products is low, and the reparability is small.

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