Heat treatment process Plan of Zhangqiu Forgings
The process standard of Zhangqiu forging Plant includes technical requirements, tooling equipment, testing instruments and methods, etc.
The formulation is based on the specific conditions on the basis of referring to the advanced standards at home and abroad.
According to the advanced equipment standards at home and abroad, combined with the actual equipment conditions, formulate equipment technical standards; according to the advanced testing level and instrument standards at home and abroad, combined with the sample situation of the company, formulate reasonable testing standards.
The heat treatment of Zhangqiu forgings should give priority to the published national standards.
In the formulation of company standards, the standard level should be slightly higher than the production level, in order to promote the overall technical level and management level.
The enterprise standards formulated shall be reported to the standards management department for the record to ensure the validity of the standards.
Zhangqiu forging process rules, also known as operation rules, it is not based on a forging to compile, but according to the same part, is the refinement of the process.
The principle of heat treatment process is introduced.
There is no uniform format for its preparation, it is based on the following points.
Scientific and reasonable: according to process type or product type to write, such as annealing process code, quenching process code and so on.
The operation points which can not be explained in detail in the process rules, such as charging points, effective area of furnace, deoxidization, vacuum furnace degassing, etc.
The common heat treatment parts are explained.
According to the performance of the equipment.
This paper theoretically introduces the heat treatment process specification and expounds the arrangement relationship among the heat treatment processes in order to browse the whole process implementation process.
On the inspection of forgings before heat treatment.
The pre-heat treatment inspection of Zhangqiu forgings is the pre-inspection process of the finished products according to the forging surface quality, shape, size and technical conditions, forging drawings and process cards after the end of the forging forming process.
The following aspects should be paid attention to in the physical examination of shellfish.
The appearance of forgings should be free from cracks, rust spots, oxide scale and bruising that affect the quality of heat treatment.
The schematic diagram of forgings shall indicate the main dimensions, special shape parts, large cross-section parts, and the shape and position of holes.
The dimensions and accuracy of heat-treated parts shall be marked with machining allowance, surface roughness, dimensional accuracy, position accuracy and shape accuracy.
Spot check the underpressure according to 10% of the heat treatment batch number of forgings, and enter the inspection process when the batch of forgings meet the requirements of the drawings.
Forgings inspected before quenching should be stored separately.
Zhangqiu forgings should check the finished product rack before quenching, put in 1-2 forgings (fracture waste can not be sampled), and mark the word "sampling" on the material to show the difference.
After inspection, the attached card should accurately fill in "finished product quantity", "repairable scrap quantity", "scrap quantity" and "defect code", and be signed by the inspector.
Below 700 ℃ and 800 ℃, the thermal conductivity of stainless steel is relatively small, so the heating time for stainless steel forging is longer.
The grain growth tendency of Ferritic stainless steel is serious when heated to high temperature, which leads to greater brittleness. Martensitic stainless steel is particularly serious in oxidation and decarburization at high temperature, which requires them to shorten the heating time as much as possible at high temperature.
For precision forgings or important forgings with small allowance, the surface of the billet should be coated with a layer of glass lubricant before heating.
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