What are the precautions for gray iron casting?

Gray cast iron graphite is in the form of sheets, the effective bearing area is relatively small, and the top is prone to stress concentration, so the strength, plasticity and toughness of gray cast iron are lower than other cast irons, but it has excellent vibration damping, low notch sensitivity and high wear resistance. So, what are the precautions for gray iron casting?

What are the precautions for gray iron casting?

1. The process content of gray iron castings that can be clearly expressed on a certain view or section view does not have to reflect all the process symbols on each view, so as not to overlap the symbols all over the drawings.

2. If the machining allowance size of gray iron castings is the same as the top surface, inner hole, bottom surface and side size, and there is no mark on the drawing, it can be filled in on the drawing process card on the back of the drawing or written in the technical conditions.

3. The fillet corners and equiangular draft slopes of the same size cast iron parts are not marked on the drawings, but only written in the technical conditions.

4. If the sand core boundary line of gray iron castings coincides with the parts line, machining allowance line and cold iron wire, the sand core boundary line can be omitted.

5. The relationship between the sand core line and the processing allowance line in the profile of gray iron parts has different processing methods in different factories.

6. Gray iron casting parts single pieces, small batch products, and even in some large-scale production factories, casting process diagrams are drawn on the product drawings, which are directly used to guide production.

7. The various process dimensions or data marked on the gray iron castings should not cover the data on the product drawings, which should be convenient for workers to operate and conform to the actual situation of the factory.

What are the maintenance measures for gray iron casting?

1. When not needed, the gray cast iron should be cleaned in real time, and then coated with a layer of anti-rust oil, covered with anti-rust paper, and covered with the outer packaging of the gray cast iron table to avoid damaging the working surface of the gray cast iron.

2. In order to avoid the overall deformation of gray iron castings, the workpiece should be removed from the gray iron casting, gray iron plate, and cast iron platform after use to prevent the workpiece from being pressed on the cast iron plate for a long time and causing the deformation of the gray iron casting.

3. Gray iron castings should be inspected once a week according to national standards, and the inspection cycle can be 6-12 months depending on the specific situation.

What are the cleaning methods for gray iron casting?

1. First of all, the cleaning personnel should clean the castings of each furnace in line with the principle of first urging and then slowing.

2. Secondly, when cleaning the casting, check whether there are serious defects on the surface of the casting. If there are serious defects, but if you cannot judge whether the casting is scrapped after cleaning, you should report it to it in time.

3. In addition, it should not be damaged when cleaning the casting, the edges and corners of the casting are broken, and the thin-walled casting cannot be hammered with a sledgehammer.

4. After that, when cleaning large and medium-sized castings, they should be placed firmly, clean the place, and when flipping, the hook should be tightly tied to prevent the castings from falling or colliding.