5 research outputs found
DETERMINATION OF PLASTIC DEFORMATION COEFFICIENT FOR ONE-EDGE DRILLS
The plastic deformation coefficient, also called the relative plastic deformation, is related
to the angle of shifting of the chip and the rake angle of the tool. Studying the nature of chip shifting
and deforming layer material relative to the face and major flank of the tool is of great importance
for determining both the workability of the materials and the correct choice of cutting tool
characteristics.
This article proposes a methodology based on mathematical dependencies for determining the
coefficient of plastic deformation. Theoretical results are presented based on the proposed
methodology, as well as results of experimental studies
DETERMINATION OF CHIP LENGTH COMPRESSION RATIO AT ONE-EDGE DRILLS
Increasing the volume of chips, taken per unit of time under conditions of high speeds
and temperatures of the cutting, makes the problem of reliably shredding the chips and their
effective removal from the cutting zone, particularly topical. The present scientific development
examines the determination of the chip length compression ratio according to the proposed
methodology. Presented are the results of the theoretical and experimental studies made according
to the methodology
MILLING OF COMPLEX SURFACES
In the article are considered principle kinematic schemes of cutting for perform the
machining of recessed and convex rotating surfaces. The mathematical dependencies determining
the trajectory character described by the relative motion of the respective kinematic cutting
scheme are presented. Of particular importance in performing of various principle kinematic
schemes of cutting is the direction of motion of the tool relative to its rotation
KINEMATIC SCHEMES OF CUTTING IN MILLING
The presented article analyzes the used kinematic schemes of cutting in milling. With
their change and the change in the kinematic ratio of the velocities of the elementary movements,
the type of the work surface can be changed.
The mathematical dependences presented in the article, describing the trajectory of the relative
work motion of a cutting edge point, are used to conduct theoretical studies of the geometric
parameters of the milling cutter performed by simulation modeling in the environment of the
software SolidWorks
Analyzing the Potential of Drill Bits 3D Printed Using the Direct Metal Laser Melting (DMLM) Technology to Drill Holes in Polyamide 6 (PA6)
Drilling with standard twist drill bits is the most common method to create cylindrical holes. With the constant development of additive manufacturing technologies and easier access to additive manufacturing equipment, it is now possible to design and fabricate solid tools suitable for various machining applications. Specially designed 3D printed drill bits seem more convenient for standard and nonstandard drilling operations than conventionally made tools. The study described in this article aimed to analyze the performance of a solid twist drill bit made from steel 1.2709 using direct metal laser melting (DMLM), which was compared with that of a drill bit manufactured conventionally. The experiments involved assessing the dimensional and geometric accuracy of the holes made by the two types of drill bits and comparing the forces and torques occurring during the drilling of holes in cast polyamide 6 (PA6)