This paper deals with the optimization of technological parameters (such as discharge voltage, current amplitude, time of impulse) to improve a dimensional accuracy of high aspect ratio holes obtained by using electrical discharge drilling (EDD). High aspect ratio holes characterize aspect ratio length to diameter of hole above 10 and diameter less than 1 mm. Due to drilling the holes included difficulties, especially in case applying difficult–to–machine materials as workpiece. In the first part of the article, based on the results analysis of experimental research, a mathematical model is developed. The second part of the study presents the results analysis of method prediction of selected process parameters which influence the technological factors such as linear tool wear, material removal rate and conicity angle.
Nowdays the measurements with using of a thermal camera are more and more applied. The thermal-imaging technique can be included into the diagnostic methods such as roentgenography, ultrasonography, computer tomography, magnetic resonance. The thermal–imaging technique gives the possibility of measurement by using of emitted infrared rays from human body. In the paper the results analysis of experimental research contains the temperature field of the hand dorsum are presented. The results of analysis demonstrate possibility detecting of asymmetrical changes which indicate e.g. beginning of diseases (without presenting of any symptoms).
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
data.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.