The type of blank should be determined according to the material, shape and size of the parts, and the batch and production conditions of the parts should also be considered in the computer gong processing. Transmission shaft, small diameter, the diameter of each section of the outer circle is not big, optional round steel blanking. In order to save materials and processing time, if the gear shaft has large quantity and forging conditions, the forging blank should be selected; otherwise, round steel cutting should be selected. The material of bearing cover is cast iron, and the blank should be cast. Processing gear, its material is 40 steel, and the outer circle diameter is small, small outer circle is short, optional round steel blanking. Due to the large diameter of the outer circle and hole of the gear, the gas cutting of the steel plate with the corresponding thickness can be selected for a single piece, and the forging can be selected for a large batch to forge the ring-shaped blank. In this way, the material can be saved, the processing time can be reduced, and the mechanical properties of the forging blank are better.
- Determine the processing sequence of parts
The processing sequence should be determined according to the type, structure, size, processing accuracy, surface roughness, heat treatment and other technical requirements of the blank.
- Determine the processing procedure
Determine the machine tool, workpiece clamping method, processing method, processing size and detection method used in each process, including the allowance for the next process. Generally, for small and medium-sized parts, the outer cylinder and the inner cylinder and the plane in CNC machining all refer to the unilateral allowance. In the small batch production of a single piece, the larger the blank size is, the smaller the blank size is. Total allowance: 3-6 mm for hand molded castings, 3-7 mm for free forging or gas cutting parts and 1.5-2.5 mm for round steel. Process: semi finish turning is 0.8-1.5mm; high speed finish turning is 0.4-0.5mm.
- Determine the cutting amount and man hour quota
The cutting parameters of single piece and small batch production are generally selected by the producers themselves, and the man hour quota is set by the management personnel.
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