scholarly journals Tool stability analysis for deep hole drilling

2018 ◽  
Vol 224 ◽  
pp. 01035 ◽  
Author(s):  
Sergey Gorbatyuk ◽  
Valery Kondratenko ◽  
Larisa Sedykh
Keyword(s):  
Stability Analysis ◽  
Cutting Force ◽  
Axial Compression ◽  
Cutting Tools ◽  
Critical Value ◽  
Hole Drilling ◽  
Deep Hole ◽  
Compression Load ◽  
Rotary Cutting ◽  
Rotary Cutting Tools

A large number of parts have deep holes, therefore, rotary cutting tools, which represent relatively long and thin columns are used for holemaking. In this article we analyze the behavior of such tools under the influence of an axial compression load, in our case, the axial cutting force Fp , which differs fundamentally from the compression of short tools. Moreover, experience shows that when the cutting force Fp reaches a certain critical value equal to Fkp , a long straight column becomes unstable.

A Role of the Resultant Cutting Force in Deep-Hole Drilling

1999 ◽  
Author(s):  
V. N. Latinovic ◽  
V. P. Astakhov ◽  
M. O. M. Osman
Keyword(s):  
Cutting Force ◽  
Static Stability ◽  
Optimal Location ◽  
Design Criterion ◽  
Hole Drilling ◽  
Deep Hole ◽  
Force Vector ◽  
Force System ◽  
Deep Hole Drilling

Abstract This paper present results of the analysis of a tool static stability in deep-hole drilling. The analysis has been carried out to determine the optimal location of the drill guide pads relative to the drill’s cutters (based upon criteria of equal total pad reactions and equal stability indicators). It is demonstrated that the optimal location can be achieved under asymmetrical location of the supporting pads relative to the direction of the resultant cutting force in a plane perpendicular to the drill axis. By consideration of the drill static force system in the plane which contains the drill axis and the resultant cutting force vector, a new design criterion is proposed. The essence of this concept is to design the deep-hole drills with minimum rubbing and wear of the guide pads and provide for the tool self-piloting.

scholarly journals Modeling and Distribution Laws of Drilling Force for Staggered Teeth BTA Deep Hole Drill

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Xubo Li ◽  
Jianming Zheng ◽  
Yan Li ◽  
Lingfei Kong ◽  
Weichao Shi ◽  
...  
Keyword(s):  
Cutting Force ◽  
Friction Angle ◽  
Hole Drilling ◽  
Force Model ◽  
Deep Hole ◽  
Drilling Force ◽  
Cutting Force Components ◽  
Distribution Laws ◽  
Force Components ◽  
Thrust And Torque

The boring and trepanning association (BTA) deep hole drilling is a typical self-guiding machining method. The drilling force and its distribution laws along the cutting radius directly affect the stability of drilling and the quality of machined hole. Based on the oblique cutting theory, a novel drilling force model is developed to predict the thrust and torque for staggered teeth BTA deep hole drill with variable geometries. Using the constraint relationships between the cutting force components and cutting angles, combined with the measured drilling force during the drill entrance, the parameters of the model including normal shear angle, normal friction angle and shear stress involved in the cutting force coefficients along the cutting radius, and the axial and circumferential friction coefficients between the guide pads and the hole wall are obtained. The model-predicted drilling force is validated by experimental results.

Optimal Design of Multi-Edge Cutting Tools for BTA Deep-Hole Machining

1979 ◽  
Vol 101 (2) ◽  
pp. 281-290 ◽  
Author(s):  
V. Latinovic ◽  
R. Blakely ◽  
M. O. M. Osman
Keyword(s):  
Objective Function ◽  
Cutting Force ◽  
Cutting Tools ◽  
Design Procedure ◽  
Preliminary Test ◽  
Cutting Parameters ◽  
Deep Hole ◽  
Cutting Head ◽  
Nonlinear Objective Function ◽  
Hole Machining

The design procedure of optimal multi-edge BTA deep-hole machining tools with unsymmetrically located cutters and preliminary test evidence are presented. Based on a mathematical model of cutting forces in terms of fundamental cutting parameters of the tool, a multivariable, nonlinear objective function was derived and modified to an unconstrained type with bounded decision variables. A numerical, direct search method, accelerated in distance, was selected to minimize the objective function. This procedure insures, on one hand, a predetermined cutting force resultant necessary for tool guidance; on the other hand, it minimizes the variation of cutting edge pressure. A relatively fast computer routine was adapted to provide the optimal tool parameters, which then were used to design cutting head prototypes. Two trepanning heads of three and two cutters were manufactured and tested at production facilities. The test results showed that the cutting force resultant was well predicted in both heads and that they were well guided. Much higher feed rates were possible compared to those achieved with single-edge tools without any loss of hole accuracy straightness or surface finish.

Experimental Research on Superlong Deep-Hole Drilling Processing Technology for Steel of 4145H Drill Collar

2011 ◽  
Vol 201-203 ◽  
pp. 2597-2600
Author(s):  
Zhan Feng Liu ◽  
Rui Liang Li
Keyword(s):  
Cutting Tool ◽  
Cutting Tools ◽  
Tool Material ◽  
Cutting Parameters ◽  
Machining Process ◽  
Hole Drilling ◽  
Deep Hole ◽  
Actual Structure ◽  
Steel Processing ◽  
Drill Collar

Through the analysis for steel of 4145H drill collar, Research into the various factors of cutting, such as the cutting tool material, cutting-tool angle and cutting parameters, combined with the actual structure of the workpiece and the superlong deep-hole processing method for study. In the test, the machining process is analyzed, especially the process of boring and honing. The test result indicates that the trepanning process is stable and reliable to solve the superlong deep hole (Φ71mm×7500mm) of 4145H drill collar steel processing problems of production if the optimizing cutting method is appropriate and the cutting tools and the cutting parameters are rational.

On the Development of Multi-Edge Cutting Tools for BTA Deep-Hole Machining

1976 ◽  
Vol 98 (2) ◽  
pp. 474-480 ◽  
Author(s):  
M. O. M. Osman ◽  
V. Latinovic
Keyword(s):  
Cutting Force ◽  
Removal Rate ◽  
Cutting Tools ◽  
Tool Geometry ◽  
Deep Hole ◽  
Tool Cutting ◽  
Hole Machining ◽  
High Length ◽  
Film Lubrication

The design concept and the analysis of multi-edge BTA deep-hole machining tools are presented. The main feature of the design is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self-guidance of the boring tool. The role of this stabilizing force for machining accurate holes of high length-to-diameter ratio is explained and demonstrated by examples. The principles of tool self-guidance and the range of application for various drilling methods are discussed and examples are given. The results show that, besides achieving higher material removal rate, the use of unsymmetrical multi-edge cutting tools provides similar performance to that of single cutting-edge boring tools in terms of tool stability and bore accuracy. Results also show that by controlling the cutting force resultant at a predetermined value based on feed rate, cutting conditions and tool geometry, a full-film lubrication at wear-pads of the boring head can be insured during the boring operation.

Research on Deep Plowing for Compacted Soil Based on SPH

2011 ◽  
Vol 211-212 ◽  
pp. 505-509
Author(s):  
Liang Jing Li ◽  
Guo Qing Zhang
Keyword(s):  
Cutting Tools ◽  
Three Dimensional ◽  
Sph Method ◽  
Compacted Soil ◽  
Soil Process ◽  
Rotary Cutting ◽  
Reduce Energy Consumption ◽  
Deep Plowing ◽  
Rotary Cutting Tools ◽  
Force Characteristics

In order to reduce the working power of tillage implement, made a combination of the down-cut rotary tillage and the up-cut rotary tillage applied on small agricultural machine is proposed. SPH method is applied to the three-dimensional numerical simulation for rotary soil process of rotating, and thus draws the force characteristics of rotary cutting tools under the different parameters. Combining with the simulation data of the up-cut rotary tillage, the work of tool matching is done. So it can make the force of the up-cut rotary blade and the down-cut rotary blade offset respectively. Accordingly, the small agricultural machinery can reduce energy consumption and improve efficiency. Based on these methods, we develop the small farming machinery which is fit for farming in compacted soil. The data and analysis program based on the study are of great significance for the small farming machine.

Experimental Research on Superlong Deep-Hole Drilling Processing Technology for Beryllium Bronze

2011 ◽  
Vol 130-134 ◽  
pp. 1634-1637 ◽  
Author(s):  
Zhan Feng Liu ◽  
Rui Liang Li
Keyword(s):  
Heat Treatment ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Tool Material ◽  
Cutting Parameters ◽  
Processing Method ◽  
Hole Drilling ◽  
Deep Hole ◽  
Actual Structure ◽  
Beryllium Bronze

According to the material properties and the cutting performance of beryllium bronze, research into the various factors of cutting, such as the materials heat treatment, the cutting tool material, cutting-tool angle and the cutting parameters, combined with the actual structure of the workpiece and the overlong deep-hole processing method for study. The test proved that selected reasonable heat treatment , processing methods, cutting tools and cutting parameters can be solved Φ12mm × 4000mm overlong deep-hole processing problems of the beryllium bronze.

Sign in / Sign up

Export Citation Format

Share Document