Casting process planning, contents and procedures of machine tool castings

The casting process planning should be carried out before the casting of machine tool castings, and the feasibility of the casting process should be repeatedly demonstrated. Perfect and sort out the appropriate casting process in order to carry out casting production, the casting process of machine tool castings includes the following six aspects.

First, review the casting structure; Check and improve the casting structure, without affecting the use of the premise, the casting structure as far as possible in line with the casting process.

2. Casting process diagram; In the use of machine tool casting drawings provided by the unit (or photocopy) with different color symbols to indicate the casting orientation and parting surface, processing allowance, shrinkage rate, drawing drug, reverse deformation, parting negative, process complement positive pouring gate orientation, quantity and machine tool, large machine tool castings can participate in the cold iron, cold iron orientation and standard when not affecting the use of. Core shape, quantity and size of core head, casting bar, hanging bar, pressing iron, etc.

3. Machine tool casting drawings; After the casting process planning, the changed shape of the machine tool casting, the standard place and skill conditions, and the inspection method are reflected in the casting drawings, where the hardness, standard error, casting defects that exist or allow welding and other special requirements should be clearly marked out.

4. Molding assembly drawing of machine tool castings; The drawing indicates the casting orientation, the number of sand cores, the fixed or core order, the orientation of the pouring gate and the cold iron, the structure of the sand box and the standard size.

5. Casting process card; It is used to explain the operation process of modeling, core making, casting, unpacking, heat treatment, cutting and pouring, welding and other processes, operating procedures and skills to go.

6. Process verification; Test machine casting standards, surface quality internal defects and other quality conditions are qualified, verify the process requirements, operation points are reasonable, and repeatedly modify the process equipment until the casting quality is qualified. Machine tool castings are widely used in mechanical products mainly in the following aspects: When planning machine tool castings, in addition to confirming the shape and standard of the casting according to the working conditions and the function of the metal data, the rationality of the planning needs to be considered from the perspective of casting alloys and casting characteristics. In the process, the obvious standard effect, condensation shortening, stress and other problems, to prevent or reduce the composition of the copper casting segregation, deformation, cracking and other shortcomings, machine casting selection of lost mold/resin sand casting.

Machine tool castings are widely used in mechanical products mainly in the following aspects:

1, compared with the forming methods of metal parts such as casting, stamping, welding, powder metallurgy, casting method can produce messy shapes, especially hollow shapes and parts, such as machine bed, box, etc. And because the casting method has very little constraint on the structural shape of the parts, the machine tool casting can select a reasonable cross-section shape according to the stress conditions, and according to the stress conditions, it can also select a reasonable cross-section shape according to the stress situation, and it can also be set up according to the demand to add the strength and stiffness of the structure.

2, under the conditions, the selection of casting, Mosaic casting, bimetal casting, thin channel casting skills and cast welding structure, can make the arrangement of parts reasonable, the selection of these methods can also deal with some other metal forming methods difficult to deal with the problem, so as to obtain good skills and economic characteristics.

3, a variety of machine tool casting data and standards can also be produced by casting method, the metal data commonly used in industry can be cast, and some metal data, if widely used, can only choose casting method molding.

The above is the relevant content of machine tool castings.