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  Digital Catalogue for Technology and Products Development


   Technology and Product Development

    Basic Information

Technology developed: High speed micro machining center (TP19768198953)
Category: Product(Hardware/Material/Software)
Details of Inventor(s):
Inventor Institution/Organization/Company Department Designation
Dr. Vivek Bajpai IIT ISM Dhanbad Mechanical Engineering Assistant Professor
Technical Application Area: Engineering
If 'Other', please specify:
Please give more details of new technical application area:
The application of micro components in various fields have promoted the development of ultra-precision micro-machine tools. The micro-machining is characterized by its high accuracy, good dimensional precision and smooth surface finish. The micro-milling machine tools are capable to produce complex 3D shapes with mirror surface finish on difficult-to-machine materials such as silicon. However the major difficulties of micro-machine tools are their low tool stiffness and low MRR. High speed micro-machining has been adopted to improve the productivity and also to reduce the chip load. High-speed micro-milling machine tools have required high speed spindles to maintain the machining speed and efficiency. But at these high spindle speed acute vibration takes place in the machine tools (Suh et al, 2002). This jeopardizes the dimensional accuracy, precision and surface finish of micro size products. Apart from this, chatter may be developed due to vibration and that can lead to tool wear and breakage of the cutting tool (Quintana and Ciurana, 2011). Chatter may also affect the spindle and the machine tool (Clancy and Shin, 2002). Therefore vibration isolation is necessary to maintain the accuracy and surface finish of the machined surface and also to maintain the tool life. The stiffness of the machine structure plays a very crucial role for machining efficiency and vibration isolation of a machine tool (Chen et al, 2016). Hence the high-speed micro-milling machine structure must have to provide good static and dynamic stiffness as well as good damping characteristic to the machine tool for quality machining performance (Huo et al, 2010).
Organization(s):
Indian Institute of Technology (Indian School of Mines) Dhanbad
Affiliated Ministry: MHRD, Govt. of India
Type of technology development: Indigenous
Does the technology help in replacing any import items currently
procured from outside India?
Yes
Does the technology have export potential? Yes
Category of Technology developed: Immediate Deployment
Stage of Development: Prototype Level
Please describe in detail including the TRL Level:
A prototype of high speed micro milling has been developed with a travel of 150 mm in each three directions with an accuracy of plus minus 2.5 microns and other with ultra high precision of plus minus 500 nano meter. Two machines have been developed one is semi high speed with a maximum spindle speed of 60k rpm and the other one is ultra high speed machine with a maximum spindle rotational speed of 140k rpm.

    Abstract:

Applications: An assembled machine structure containing a gantry type machine frame and a machine bed made of granite was developed for increasing the static and dynamic stiffness as well as the damping capacity of a high-speed micro-milling machine tool. It consists of a machine bed, two frame columns and an upper block. The amplitude of vibration is very less and approaching towards nanometer level throughout the entire rotational speed of the spindle used while micro-milling operation. This design is suitable for vibration isolation of the high-speed micro-machining center, thus asserting high precision and excellent surface finish for micro machining. The fabricated machine can create three dim. free form features on hard metals and ceramics.
Advantages: The machines can perform high speed materail removal job on metal and ceramics of high hardness. Ti and Ni alloys have been machined with a great accuracy and precision. The machine bed is vibration free and therefore a maximum deflection due to vibration is noted as less than 10 nm.

    Technology Inputs:

Imported Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
High speed spindle NA
Indigenous Equipment/Spare Parts:
Equipment/Spare Parts Year ITC-HS Code
Ball and screw linear motorized stages NA
Imported Raw Materials:
Raw Materials Year ITC-HS Code
NIL NA
Indigenous Raw Materials:
Raw Materials Year ITC-HS Code
NIL NA
Existing R&D Facilities used:
Facilities Year ITC-HS Code
NIL NA

    R&D Investment:

R&D investment (Rs. in Lakhs):                    
Indian Source (Rs.) Foreign Source (Rs.) Year
40 0 NA

   Patents & Publications:

Patents:
Filed Patents (No.) Granted Patents (No.) Year
2147483647 0 NA
Publications:
Submitted (No.) Published (No.) Year
0 0 NA

    Commercialization Potential:

Who are the Potential Licensees? Varnica precision pvt ltd
What commercially available products address
the same problem?
Company Product Problem Addressed
Kern High speed micro machining center machining at micron level
Would you like to develop this invention further with
corporate research support?
Yes
Would you be interested in participating in cluster based
programs for commercialization research or business
planning for your invention?
Yes
      Submitted by: Sagar Pal Date of Submission: 3-8-2020



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