hi this is harshil, n i want information about the topic IMPROVEMENT IN TOOL LIFE OF MILLING CUTTER BY APPLICATION OF CRYOTREATMENT

---

ABSTRACT:

The term Cryogenic is derived from the Greek word ‘Cryo’ which means ice, cold or frost ‘genics’ means born. Cryogenic deals with production & utilization of low temperature below 0oc. The oxygen was firstly liquified in 1877 by coilletet & pietet in USA. The research work is also start at that time.
Cryogenic is of great importance in our day to day life applications and also is specialized applications.
Space research, it is used as a fuels in rocket, commercial application, Cryobilogy, Cryosurgery, in computers and industries.
Cryogenic treatment is very benifited as computer to conventional heat treatment. In conventional heat treatment austenite is converted into martensite. The conversation percentage of martensite on range of 30% to 50%. The retained austenite forms cracks in metal which reduce tool life. But when we Cryotreat the tool below 0oc using liquid Nitrogen. The austenite completely converted into martensite and martensite is hard so tool life is increased.
Actual Cryogenic treatment on tools can be done by two methods
1. Shallow Cryogenic process
Cooling at –120oc by means of dry ice or ultra cold nitrogen.
2. Deep Cryogenic process
Deep Cryogenic process means cooling at -196oc by liquid nitrogen.
After Cryotreatment mechanical properties are improved like strength, fatigue strength, impact strength, hardness and wear properties and thermal conductivity with tool life and when we perform actual Cryogenic treatment on tool the life of tool increased by 44%.


More

---

Mechanical Project Engineer required by a national building services contractor to undertake the delivery of a £4m HVAC package on new hotel development in Central London. Working within a site based M&E project team you will report in the Senior Project Manager and will be required to ensure the smooth running of the HVAC engineering package through design development, installation, commissioning to hand over and will be expected to perform duties to include the following:

- Management of site based team to ensure timely installation of HVAC services,
- Development of the HVAC design to ensure installation achieves clients specification,
- Resolve on site HVAC engineering issues,
- Assist the project manager and QS in cost control during the contract,
- Assist in the procurement and co-ordination of materials and sub-contractors to ensure work is completed on time and to specification,
- Ensure H&S guidelines are adhered to by sub-contractors,
- Manage the commissioning process through to hand-over,
- Assist in the production of O&M manuals,
- Attend relevant design and site meetings,