Category: Machining Methods

Wax pressing (wax model made by shooting wax) — wax repairing-wax inspection-group tree (wax module tree) — making shells (dip the slurry first, drench the sand, then dip the slurry, and finally mold Shell air-drying) — Dewaxing (steam dewaxing) ——- Mold shell roasting-Chemical analysis-Pouring (Pouring molten steel in the mold shell)-Vibration shell removal — Cutting and separation of castings and pouring rods-grinding gate-initial inspection (blank inspection)-shot blast cleaning-machining-polishing-finished product inspection Warehousing The casting production process is roughly like this. In general, it can be divided into wax pressing, shell making, pouring, post-machining, and inspection. Wax pressing includes (pressing wax, repairing

Rough reference is the reference for positioning on the rough surface in the initial processing steps. When selecting a rough reference, ensure that each surface has sufficient machining allowance so that the processed surface has a proper mutual position with the non-processed surface. The selection principles are:

In the subsequent steps, the processed surface is used as the positioning reference. This positioning reference is called the fine reference. The selection of the precision reference directly affects the mutual position accuracy of each surface of the part. Therefore, when selecting the precision reference, it is necessary to ensure the machining accuracy of the workpiece and the convenient and reliable clamping. The principle of choosing the fine benchmark is:

(1) Analysis of completeness and correctness of part drawings The view of the part should meet the requirements of the standard, the position is accurate, and the expression is clear; the relationship between the geometric elements (points, lines, and surfaces) (such as tangent, intersection, and parallel) should be accurate; the dimensioning should be complete and clear. (2) Analysis of parts technical requirements The technical requirements of the parts mainly include dimensional accuracy, shape accuracy, position accuracy, surface roughness and heat meter processing requirements. These technical requirements should be able to guarantee the performance of the parts. The analysis of the

1) Pay attention to the verticality when dragging the workpiece, drag it flat while pulling the vertical edge. 2) When the workpiece is split, verify twice. 3) After dividing the number of hits, the median should be checked according to the size of the outline and the size on the parts drawing provided in the program sheet. 4) All workpieces are divided in the centering mode, and the zero position must also be divided in the centering mode before moving to the edge to ensure that the two sides have the same margin. If the situation is unilateral, you can

Four important technical indicators for the quality of fine holes in precision parts processing