The paper discusses the impact of the feed screw heating on the machining accuracy. The test stand was built based on HASS Mini Mill 2 CNC milling machine and a Flir SC620 infrared camera. Measurements of workpiece were performed on Talysurf Intra 50 Taylor Hobson profilometer. The research proved that the intensive work of the milling machine lasted 60 minutes, causing thermal expansion of the feed screw what influence on the dimension error of the workpiece.
This paper discusses the results of the experimental research performed with the support of finite element method. The deformation of the thin walled aircraft engine corpus was analyzed based on a geometric model. Then, the boundary of the outer side of the part was loaded by the components of a cutting force during milling. The material model of the part was also defined in the simulation software. The analysis allowed to optimize feed rate in order to decrease the deformation of the part.
Paper presents the experimental study performed to determine the effect of the value and direction of the tool inclination angle and feed speed on the selected surface roughness parameters. The samples were made of 16MnCr5 steel machined with ball end mill made of cemented carbide. The cylindrical surfaces were machined during the research. This enabled to identify the areas where various values of the tool inclination angle were applied.
This paper describes the research results of surface quality research after the sintered carbides turning by the tools with
edges made of polycrystalline diamonds (PCD). The research trials were conducted for tools with different nose radii
and the influence of three independent parameters (vc, f, repsilon) affecting the surface roughness were analyzed. The impact of
the binder material content Co (cobalt) on the surface quality during the turning process (according to the values of
surface roughness parameter Ra) is described further on. The values of vc, f, repsilon at which the smallest surface
roughness (for the particular work piece materials) could be achieved were defined. Based on the ANOVA variance
analysis it was possible to find different effects of the research factors on the surface roughness (for the two types of
sintered carbides shafts). For the shaft with 25% Co content, the significant influence is for two parameters: the cutting
speed vc and the nose radius repsilon. For the shaft with 15% Co percentage content, the significant influence is only for the
nose radius repsilon.
The analysis results of machining accuracy after the free form surface milling simulations (based on machining EN AW-
7075 alloys) for different machining strategies (Level Z, Radial, Square, Circular) are presented in the work. Particular
milling simulations were performed using CAD/CAM Esprit software. The accuracy of obtained allowance is defined as
a difference between the theoretical surface of work piece element (the surface designed in CAD software) and the
machined surface after a milling simulation. The difference between two surfaces describes a value of roughness, which
is as the result of tool shape mapping on the machined surface. Accuracy of the left allowance notifies in direct way a
surface quality after the finish machining. Described methodology of usage CAD/CAM software can to let improve a
time design of machining process for a free form surface milling by a 5-axis CNC milling machine with omitting to
perform the item on a milling machine in order to measure the machining accuracy for the selected strategies and cutting