Quality and productivity increase at profile creep feed grinding of turbine blades

2016 ◽  
Vol 1 (5) ◽  
pp. 17-24 ◽  
Author(s):  
А. Норин ◽  
A. Norin ◽  
Сергей Никитин ◽  
Sergey Nikitin ◽  
В. Макаров ◽  
...  
Keyword(s):  
Turbine Blades ◽  
Complex Conjugate ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Abrasive Disk ◽  
Productivity Increase ◽  
Nc Machine ◽  
Conjugate Surfaces ◽  
Definition Of ◽  
Physical Phenomena

A new concept of working quality assessment and cutting mode setting at profile creep feed grinding of some complex conjugate surfaces simultaneously on a multiaxes NC machine is presented. The analysis of dynamic and thermo-physical phenomena at machining each of the conjugate surfaces grinded simultaneously by one profile abrasive disk is carried out. The simulators for the definition of contact patch parameters of a grinding disk and a billet at a creep feed grinding of different conjugate profile surfaces of turbine and nozzle blades of GTEs allowing the prediction of material removal intensity, grinding disk wear, and roughness of every surface on the basis of changes in cutting modes, disk characteristics, dynamics of elastic, thermal and operation processes in a technological system are shown. This procedure allows controlling the process of profile creep feed grinding to achieve preset parameters of surface quality, dimension accuracy in blade profiles of gas turbine engines, productivity increase and decrease of machining prime cost.

Pulse Dressing in Creep Feed Grinding

1989 ◽  
Vol 203 (1) ◽  
pp. 51-55
Author(s):  
S M Rezaei ◽  
T R A Pearce ◽  
T D Howes
Keyword(s):  
Turbine Blades ◽  
Grinding Wheel ◽  
Grinding Forces ◽  
Dressing Method ◽  
Form Accuracy ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
Nickel Base

Machining of the roots and shrouds of turbine blades is normally performed by continuous dress creep feed grinding. In this process, the grinding wheel is continuously dressed during the grinding operation, maintaining constant grinding forces and form accuracy. However, continuous-dressing has incurred higher wheel usage. In the tests described in this paper, creep feed grinding of nickel-base alloys was initially performed by continuous dressing to determine the burn barrier and the optimum dresser infeed rate. Pulse dressing, whereby the wheel is kept sharp by a series of dressing pulses, was then applied throughout the grinding cycle in such a way that the grinding forces were kept below the burn barrier. It was shown that wheel usage was reduced by a factor of two with the pulse dressing method. The effect of different grinding coolants under continuous and pulse dressing conditions is also discussed.

scholarly journals ТЕХНИКО-ЭКОНОМИЧЕСКОЕ ОБОСНОВАНИЕ ЭФФЕКТИВНОСТИ ПРИМЕНЕНИЯ ПЛАНЕТАРНЫХ ШЛИФОВАЛЬНЫХ ГОЛОВОК

2019 ◽  
pp. 95-100
Author(s):  
Николай Юрьевич Калиниченко
Keyword(s):  
Processing Time ◽  
Turbine Blades ◽  
Setup Time ◽  
Heat Resistant ◽  
Creep Feed Grinding ◽  
Milling Operations ◽  
Creep Feed ◽  
Increase In Productivity ◽  
Equipment Wear ◽  
Grinding Operations

The development of aviation technology is based on the introduction of new progressive technologies, the use of new materials, the improvement of technological equipment and tools. Improving aircraft engines often leads to greater use of wear-resistant, heat-resistant, heat-resistant materials based on nickel and titanium, which are characterized by low machinability. Blade processing of such alloys faces many difficulties: increased equipment wear, increased machine setup time for the operation, high cutting forces, increased wear of the cutting tool, increased processing time, etc. All this harms productivity, an increase in production time and a decrease in economic efficiency. The use of the operation of creep feed grinding instead of blade milling operations, pulling, planning and abrasive operations (pre-grinding, final grinding) reduces the time to manufacture parts while maintaining its quality and accuracy. The study of the technical and economic aspect of the proposed technology of creep feed grinding instead of preliminary and final grinding operations is of interest. The paper compares two methods of abrasive machining: traditional grinding and creep feed grinding on the SPD-30B surface grinder from Jotes (Poland) with a planetary grinding head (PGH) installed on its spindle. The study was conducted when grinding the castle part of turbine blades. The removable allowance was 3.8 mm. The processing according to the traditional grinding scheme took place in 10 passes, while the processing time was about three and a half minutes. The processing under the scheme of creep feed grinding with the use of PGH for 4 passes took about a minute of machine time. It should be noted a significant increase in productivity at the first transition when removing an allowance of 3.5 mm in the mode of deep grinding compared to traditional grinding 2.1 times. On the second and third transitions, the performance of both methods is virtually the same.

Development and Application of Continuous Dress Creep Feed Grinding

1983 ◽  
Vol 197 (4) ◽  
pp. 231-235 ◽  
Author(s):  
E Parrott
Keyword(s):  
Turbine Blades ◽  
Development Work ◽  
Implementation Plan ◽  
Creep Feed Grinding ◽  
Creep Feed

In 1979 Bristol University concluded some work, on behalf of Rolls-Royce, on continuous dress creep feed grinding. This work had only been applied to flat faces at that point. In November 1979 it was decided to embark on a production implementation plan based on profile work and involving development work in line with production implementation. This paper describes the theory of continuous dress creep feed grinding, explores the development work required and the implementation procedure and experience gained in the production of turbine blades in Product Centre 02 at Rolls-Royce, Derby.

scholarly journals Feasibility study of creep feed grinding of 300M steel with zirconium corundum wheel

2021 ◽  
Author(s):  
Jiaqiang Dang ◽  
Heng Zang ◽  
Qinglong An ◽  
Weiwei Ming ◽  
Ming Chen
Keyword(s):  
Feasibility Study ◽  
Creep Feed Grinding ◽  
Creep Feed ◽  
300M Steel

Analysis of Energy Partition in Grinding

1995 ◽  
Vol 117 (1) ◽  
pp. 55-61 ◽  
Author(s):  
C. Guo ◽  
S. Malkin
Keyword(s):  
Wheel Speed ◽  
Energy Partition ◽  
Composite Surface ◽  
Workpiece Surface ◽  
Abrasive Grains ◽  
Temperature Distributions ◽  
Analytical Results ◽  
Creep Feed Grinding ◽  
Grinding Fluid ◽  
Creep Feed

An analysis is presented for the fraction of the energy transported as heat to the workpiece during grinding. The abrasive grains and grinding fluid in the wheel pores are considered as a thermal composite which moves relative to the grinding zone at the wheel speed. The energy partition fraction to the workpiece is modeled by setting the temperature of the workpiece surface equal to that of the composite surface at every point along the grinding zone, which allows variation of the energy partition along the grinding zone. Analytical results indicate that the energy partition fraction to the workpiece is approximately constant along the grinding zone for regular down grinding, but varies greatly along the grinding zone for regular up grinding and both up and down creep-feed grinding. The resulting temperature distributions have important implications for selecting up versus down grinding especially for creep-feed operations.

Edges of Regression and Limit Normal Point of Conjugate Surfaces1

1998 ◽  
Vol 122 (4) ◽  
pp. 419-425 ◽  
Author(s):  
Ningxin Chen
Keyword(s):  
Differential Geometry ◽  
Contact Boundary ◽  
Boundary Line ◽  
Tangent Point ◽  
Common Tangent ◽  
Numerical Examples ◽  
Envelope Surface ◽  
The Common ◽  
Conjugate Surfaces ◽  
Definition Of

The presented paper utilizes the basic theory of the envelope surface in differential geometry to investigate the undercutting line, the contact boundary line and the limit normal point of conjugate surfaces in gearing. It is proved that (1) the edges of regression of the envelope surfaces are the undercutting line and the contact boundary line in theory of gearing respectively, and (2) the limit normal point is the common tangent point of the two edges of regression of the conjugate surfaces. New equations for the undercutting line, the contact boundary line and the limit normal point of the conjugate surfaces are developed based on the definition of the edges of regression. Numerical examples are taken for illustration of the above-mentioned concepts and equations. [S1050-0472(00)00104-5]

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