The internal combustion engine centrifugal casting process requirements

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of the cylinder sets of the product process requirementssteel casting foundry
The main production processes: centrifugal casting, finished product testing, mechanical properties and metallographic examination, rough, aging treatment, semi-finishing, hydrostatic testing, finishing, surface hardening heat treatment, precision machining, product testing.steel castings manufacturers
 The product specifications, production, size changes, and centrifugal casting rough to finish machining, and cutting margin, centrifugal casting and margin powerful cutting residual stress, finishing and nitrogen treatment will produce stress and deformation , the product belongs to this class of thin-walled sleeve easy to deformation part, and the surface roughness and high dimensional accuracy and geometric tolerance requirements, bore honing fine processing. To guarantee the stability of the dimensional accuracy and geometrical tolerances, there must be good to the stress aging treatment processes.investment casting

The thermal aging of the product is the implementation of the casting into the aging furnace annealed, heat aging heating methods: electric heating, gas heating, and heavy oil or coal-fired heating, electric heating to be equipped with a dedicated power supply lines and equipment, gas heating to be the laying of gas pipelines, have a gas supply, gas supply, coal-fired heating of dust and smoke pollution is serious, heat aging energy consumption is quite high.

2 VSR process scheme

VSR technology success stories in line with the characteristics of the product at home and abroad have not yet found. To this end, joint manufacturers and research institutes research, VSR technology to eliminate the residual stress, and improve the dimensional stability of the alloy cast iron cylinder liners for marine diesel engine centrifugal casting process carried out in-depth study.steel castings

2.1 Process Design

Product volume, variety, size changes, semi-finished products of structural rigidity, precision finished, and easy to deform, change or increase in the production process, the residual stress is large and constantly. To this end we determine the combination at the same time batch processing, the vertical arrangement, horizontal mounting, multi-frequency vibration programs.

2.2 the design of the vibration platform

The vibration platform design is one of the key link to ensure that the process effect, the test platform by the finite element analysis and years of experience in design, and simulation tests, the final design of the vibration platform. A maximum of nine liner combination treatment, both to meet production needs, and effectively reduce the vibration frequency of the VSR, not only me ets the requirements of VSR equipment, but also greatly reduce noise, improve the working environment.

Vibration workpiece at any vibration frequency as long as stress is large enough, in theory, be able to achieve the effect of residual stress and stability dimensions, but the rigidity of the structure of the liner using conventional vibration platform processing may reduce the workpiece internal dynamic stress, the effect of the VSR to use minimum energy to stimulate the workpiece to produce a larger dynamic stress, we must make a rigid platform and clamping device is large enough, the vibration energy transfer to the workpiece body, so that the vibration platform to produce the bending vibration mode, the workpiece to produce the radial vibration of the workpiece elastic deformation in the vibration platform.

Exciter will be placed at the crest of the two points, so that the rotation of the eccentric surface perpendicular to the plane of the fulcrum, so that platform bending resonance, the vibration fixture on the platform liner have a greater dynamic stress. The accelerometer should be placed away from the excitation point on the cylinder liner body to the workpiece body on real vibration signals.

2.3 technology implementation

First select FS7240 Series 350C-04-001 liner thermal aging and VSR treatment, processing and nitrogen treatment and then use the original process, and track in the whole process of specimen geometric dimensions and geometric tolerance measurements.

The fulcrum and the excitation point are the same, you can use different frequencies.

If the exciter power, the use of forced vibration. Due to vibration of the wavelength change, the peak area of ??the dynamic stress changes, so each change frequency should change the location of the acceleration sensor. Exciter eccentric amount is determined using the manual mode and the sensor location, and then press the automatic operation mode of vibration, automatic vibration aging device dynamic tracking workpiece residual stress changes in real time automatically adjusted until the detected AT curve stable aging scan, the device automatically, and data comparison with the vibration before the scan results automatically in accordance with the standards of the VSR effect evaluation method to determine the timeliness results,

4 Conclusion

VSR in the production of the product, replace the thermal aging process, the workpiece size and shape to meet the stability requirements; can achieve significant economic, energy saving, reduce costs, improve work efficiency; convenient, flexible, occupy a small site; completely solve the problem of environmental pollution of thermal aging; the surface oxidation; flexible work arrangements, you can supplement in finishing after. The choice of various parameters in the same time, the technical level of the VSR equipment control softwa re, the aging process is the ability to achieve the key to a stress effect of workpiece clamping are higher, there is a certain vibration and noise.