1. Forging rotation error:
Forging rotation error refers to the amount of variation of the actual rotation of the forging in the processing equipment relative to its average rotation. The main reasons for the radial rotation error of forgings are: coaxiality error of forgings, various errors of forgings, coaxiality error between bearings, and spindle winding. Appropriately improve the manufacturing precision of the spindle and the box, select high-precision bearings, improve the assembly precision of the spindle components, balance the high-speed spindle components, and pre-tighten the rolling bearings, etc., to improve the rotation accuracy of the machined forgings.
2. Guide rail error:
The guide rail is the reference on the machine tool to determine the relative positional relationship of each machine tool component, and is also the benchmark for machine tool motion. The precision requirements of the lathe guide mainly have the following three aspects: straightness in the horizontal plane; straightness in the vertical plane; parallelism (twist) of the front and rear guide rails. In addition to the manufacturing error of the guide rail itself, the uneven wear and installation quality of the guide rail is also an important factor for the poor guide forging.
3. Transmission chain error:
The transmission error of the transmission chain refers to the error of the relative motion between the first and last transmission elements in the inner chain. The transmission error is the forging error caused by the manufacturing and assembly errors of the various components in the transmission chain and the wear during use.
4. Geometric error of the tool:
Any tool in the forging process will inevitably wear out, and thus cause the size and shape of the forging to change. Proper selection of tool materials and selection of new wear-resistant tool materials, reasonable selection of tool geometry parameters and cutting amount, proper use of coolant, etc., can minimize tool size wear. If necessary, compensation devices can also be used to automatically compensate for tool size wear.
5. Positioning error:
First, the benchmark does not coincide with the error. The basis on which the surface dimensions and locations are determined on the forging drawings is called the design basis. The reference on which the size and position after processing the surface to be machined in this process are determined on the process drawing is called the process reference. When machining forgings on a machine tool, several geometric elements on the forgings must be selected as the positioning reference for machining. If the selected positioning reference does not coincide with the design basis, the reference misalignment error will occur. Second, the positioning sub-manufacturing inaccuracy error. The positioning elements on the fixture are not absolutely accurate in their basic dimensions, and their actual dimensions (or positions) are allowed to vary within the specified tolerances. The forging factory needs to form the positioning pair together with the positioning surface and the fixture positioning component. The inaccurate error of the positioning of the forging is caused by the inaccurate positioning of the positioning pair and the matching position between the positioning pairs.
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