Page 247 - Modular design for machine tools

Basic Knowledge of Machine Tool Joints 207

especially those in civil engineering, believe in the wider availability of
Rötscher’s pressure cone even in the 2000s.
Research trends between 1975 and 1985. The static, dynamic, and ther-
mal behavior of the joint has been clarified to a larger and various
extent by the research works carried out up to 1975. In due course, the
designer is capable of conducting the design of the body structure, if nec-
essary, in consideration of the joint characteristics. In addition, it is
possible to estimate the behavior of other joints that have not yet been
investigated by bringing together the knowledge about the representa-
tive joints so far investigated in detail.
In this second phase, researchers and engineers extended their focus to
the joints in the accessories and peripheral equipment, whereas the
research subject of the sliding joint was duly ramified in accordance with
the performance enhancement of the machine tool. In fact, at burning
issue was the taper connection between the main spindle and the tool
shank, as well as the connecting mechanism between the table and its driv-
ing system. To continue with the former subject, the focus is, as will be
stated later, the HSK (hollow shank tool) for MC and TC, and it becomes
a pronounced area of interest in the 1990s. In contrast, the latter is one
of the key technologies for the ultraprecision machine tool. Figure 5-26 is
a time series–like firsthand view of the research and engineering devel-
opment subjects of the taper connection. From these, it can be readily
seen that the research objective has shifted to complex ones more than ever

1930 Fretting corrosion

1950 Classification and standardization of
Heat treatment tapers, spindle noses, and rear ends of
main spindle
Lapping to increase
anti–wear resistance capability Leverage of accuracy and ease of
Year Reinforcement effects of releasing by developing new tapered
tapered bush on static stiffness joints
1970

Measurement of interface
pressure distribution

Ceramic bush bonded onto HSK (Hohlshaft-Kegel, hollow shank
1990 tapered hole tooling)
Remedies for stiffness deterioration
due to centrifugal force

Figure 5-26 Time-series visualization for technology development in taper connection.