Without attrition treatment can decrease give out heat and oscillatory

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  • source:PERFSO CNC Machining
Mutual attrition can produce machine tool part of motion vibration and accumulation of quantity of heat, all can bring bad influence to machine treatment. A kind of machine tool of NTC America company uses part of hydraulic pressure statics, eliminated attrition source, apply to the small-sized work that processes high accuracy. When machine treatment occurrence problem, vibration and giving out heat often is a culprit. Ascendant meeting affects the temperature that place of accumulation of main shaft quantity of heat brings about precision; And vibration is caused brace up quiver to destroy cutting not just, still can make cutting tool discards as useless prematurely. The vibration of most machine tool and as a result of,giving out heat is -- mutual attrition place causes part of the metal when rigid structure movement and main shaft rotate. To eliminate attrition, company of NTC America of city of Michigan city Novi rolled out a kind of machine tool, the contact of its exclusive metal and metal is only between cutting tool and workpiece. Z μ 3500 VMC (vertical machining center) the machine tool that processes small-sized work as high accuracy, its move not to need linear slideway, ball bearing or ball guide screw, with hydraulic pressure static force means undertakes equiping, have static power of a hydraulic pressure / the main shaft of Composite of hydraulic pressure motivation and actuating device of scale linear electromotor (see figure below) . The VMC that recommended way of hydraulic pressure static force designed small post on the sample workpiece of 40-HRc, the post height of the rightest end is 2mm, the diameter is 0.

02mm. The height of 9 top post is 10mm, the diameter is 0.

1mm. All these structures are to use 4mm to establish milling cutter to be in what the treatment when 15000r/min and 600mm/m comes out to say according to the company, the characteristic of this kind of design is to move quiet, have hardly inertial and definition is high. Accordingly, this machine tool very apply to the workpiece such as the medical apparatus and instruments with treatment very slashing requirement. "Actually, this machine tool is had enough precision, stability and but repeatability, can be in same aspirant travel rough machining, semifinishing machining mixes a platform finish machining. " Larry Jones of selling manager of NTC company district says so. Differ with the machine tool of the indirect opening that uses component of ball, metal to serve as motion and dormant component, z μ 3500 introduced pressurization oily film. Mechanical component slides along oil, won't contact directly between, eliminated the friction that creates vibration and hot accumulation thereby. "And, stick the structural configuration of slippery motion in order to reduce so, clearance vacillate phenomenon also is a problem no longer, because the change of linear electromotor direction is completed for an instant almost, " Mr Jones says, "Such, when doing circularity test, the machine tool can maintain those who be less than 1 μ M is homocentric degree. " he compares this action ice hockey competition. "The ice hockey that float resembles float going up in air in the component on oily film, " his explanation says, "When hitting it gently, it flies, hit a certain corner, fly to another direction again next, seem to need not be overcome it seems that inertial. " a lot of machine tools are mixed in null of operation personnel setting undertake other before each preparation works, must move a few minutes to undertake first " warm-up " . The temperature after because of the machine tool movement rises rises, the bearing of the machine tool and other metal component can expand a little and affect precision. However, z μ 3500 because have the design of metalloid contact, together with 60UKgal (1 UKgal=4.

54609dm3) cooling device is oily to hydraulic pressure static force undertake recycle and make its maintain low temperature, the machine tool starts several seconds to be able to throw the job instantly. Additional, operation personnel also need not worry can temperature rise causes deviation to need to undertake compensating process designing. This machine tool is compared other a lot of congener machine tools want quiet much, because its machine noise exclusively,be the sound that cutting tool comes up against workpiece. Quiet, the workshop of little interference is very beneficial to employee. Because do not have metallic contact, mechanical component wears away not easily, prolonged the life of the component so, reduced maintenance cost. Say according to Mr Jones, change two years oily, change 6 years oily filter -- to maintaining for system of hydraulic pressure static power already enough. Journey of number axis of the X of this machine tool, Y, Z is 13.

78in × 11.

81in × 11.

81in (1in=25.

4mm) , its feed rate can achieve 787ipm when speed of the largest main shaft is 30000r/min. Workbench norms is 17.

72in × 14.

17in, can accommodate heft 220lb (1lb=0.

45359237kg) workpiece. Main shaft is used 17.

5/25hp (1hp=745.

700W) electromotor and HSK E32 clamping apparatus. CNC Milling