To clean up the castings of CNC machining center, the following points should be done:
1. Clear the pouring riser
The pouring riser of iron castings is generally knocked off with a hand hammer or sledgehammer. For large iron castings, grooves are cut at the root first, and then knocked off with a heavy hammer: steel castings should be cut off with gas cutting or plasma arc; The pouring riser of the casting should be cut off with a saw.
2. Clear the core
When producing a single piece in small batches, it can be produced manually; when producing in batches, mechanical devices are often used, such as a vibrating core machine or a hydraulic sand cleaning device to remove the core and core.
3.Remove sticky sand
A layer of sand is often adhered to the surface of the casting and needs to be removed. Removal of sticky sand can be done manually or with a roller machine. Large quantities of small and medium castings are often cleaned by rollers.
4.The trimming of castings
The flashes, burrs and remaining pouring riser marks on the castings are generally cleaned by various grinders, hand chisels, wind shovel, etc.
5. Heat treatment of iron castings
Some castings need to be heat treated after cleaning. Commonly used methods are: internal stress relief annealing and high temperature annealing. Important castings with more complex structures and higher requirements need to be annealed to eliminate internal stress, that is, the castings are heated to SSO0C -6000C, Yg2--4h, and slowly cooled with the furnace. If a hard and brittle white structure appears on the surface of the casting and affects the processing, it can be eliminated by high temperature annealing. The annealing temperature is 900'C-950C, after holding for 2^-5 h, it is cooled with the furnace.
6.Inspection
When cleaning the castings in the CNC machining center, the cleaned castings must be inspected for quality, qualified castings are checked into the warehouse, defective products are repaired as appropriate, and the waste is analyzed. Find out the reasons and propose preventive measures.
