How To Choose Rough Materials For The Manufacture Of Precision Mechanical Parts?

Engaged in mechanical processing, high-precision mechanical parts manufacturing, the selection of blanks is determined, not only affects the economics of blank manufacturing, but also affects the economics of mechanical processing. Therefore, when determining the blank, it is necessary to consider both the factors of hot processing and economic factors, as well as the requirements of cold processing, so as to reduce the manufacturing cost of parts from the determination of the blank.

  1. Casting

  The blanks of parts with complex shapes should be manufactured by casting. At present, most castings are cast with sand molds, which are divided into wooden mold manual molding and metal mold machine molding. The wooden mold manual molding casting has low precision, large machining surface margin, and low production efficiency, and is suitable for single-piece small batch production or casting of large parts. The metal mold machine has high molding productivity and high casting precision, but the equipment cost is high, and the weight of the casting is also limited. It is suitable for small and medium-sized castings produced in large quantities. Secondly, a small number of small castings with high quality requirements can use special casting, such as pressure casting, centrifugal manufacturing and investment casting.

  2. Forging

Changzhou Machinery Parts Processing

  For steel parts with high mechanical strength, forging blanks are generally used. There are two types of forgings: free forging and die forgings. Free forging forgings can be obtained by manual forging (small blank), mechanical hammer forging (medium blank) or press forging (large blank). This kind of forging has low precision, low productivity, large machining allowance, and the structure of the part must be simple, suitable for single and small batch production, and manufacturing large forgings.

  The precision and surface quality of die forgings are better than that of free forgings, and the shape of forgings can also be more complicated, so the machining of Changzhou machinery parts can reduce the machining margin. The production efficiency of die forging is much higher than that of free forging, but it requires special equipment and forging dies, so it is suitable for small and medium-sized forgings with large batches.

3. Profile

  Profiles can be divided into round steel, square steel, hexagonal steel, flat steel, angle steel, channel steel, I-beam and other special cross-section profiles according to the cross-sectional shape. There are two types of profiles: hot rolled and cold drawn. Hot-rolled profiles have low precision, but they are cheap, and they are used for blanks of general parts; cold-drawn profiles are small in size and high in precision, and easy to realize automatic feeding, but the price is high, and they are mostly used for larger batch production, suitable for automatic Machine tool processing.

  4. Welded parts

  Welded parts are combined parts obtained by welding. The advantages of welding are simple manufacturing, short cycle time, and material saving. The disadvantages are poor vibration resistance and large deformation, which can only be processed after aging treatment.