Toshiba Kikai Kabushiki Kaisha

Other

Takeshi Momochi

Masahito Shiozaki

Kazuo Nagashima

Hideo Fujie

Makoto Sagara

Takao Arai

Hidemi Yoshino

Toshihiro Ueta

Michio Matsumoto

Masahiko Takasugi

Tomoo Hayashi

Norio Yamanishi

Seiji Nakajima

Michio Matumoto

Tadashi Sasaki

Yukio Teshima

Haruhito Sugiyama

Mashahito Shiozaki

An automatic tool changing device () has a tool storage device () with a plurality of tools stored therein, a tool chucking unit () and a tool unchucking unit () both capable of advancing/retreating between the tool storage device () and a tool changing position (P), and a tool delivery mechanism (). The tool chucking unit () is provided with a tool fastening mechanism () for fastening the tool chucking mechanism (), and the tool unchucking unit () is provided with a tool loosening mechanism () for loosening the tool chucking mechanism (). The tool delivery mechanism () delivers the tool positioned at a tool delivery position from the tool storage device into the tool fastening mechanism of the tool chucking unit so that the tool is held by the tool fastening mechanism, and delivers the tool retrieved by the tool unchucking unit from the tool unchucking unit to the tool storage device so that the tool is stored by the tool storage device.

Automatic tool changing device and working machine

A spindle () has a chuck () provided on a distal end () thereof for chucking a tool (), and a nut () screwed to the distal end () and rotatable for tightening and loosening the chucking. The spindle () is positioned relative to a nut loosening station provided with a nut loosening driver () for driving the nut () to rotate in a loosening direction, the nut () is loosened by the nut loosening driver () to remove from the chuck () a first tool () to be replaced with a second tool (), the spindle () is positioned relative to a nut tightening station provided with a nut tightening driver () for driving the nut () to rotate in a tightening direction, and the nut () is driven by the nut tightening driver () to tight-chuck the second tool ().

Tool replacement method and nut driver for machine tools

A processing method and a processing machine for restraining abrupt increase in a load applied to a tool in entering a workpiece and for avoiding decrease in tool's life span are provided. When an end mill EM is entered into a processing surface of a workpiece W, the end mill EM is first entered obliquely to a processing surface of the workpiece W, and is moved oppositely to the entering direction while keeping the cutting depth. Alternatively, the end mill EM is entered obliquely to the processing surface of the workpiece W and is moved oppositely to the entering direction while gradually increasing the cutting depth of the end mill EM. When the cutting depth reaches a predetermined cutting depth, the end mill EM is moved parallel to the processing surface of the workpiece W.

Processing method for carving a workpiece

A control apparatus for a drilling machine and a drilling method capable of quick adaptation to drilling by drills of various diameters, especially drills of small diameters, and of improving cutting efficiency. The control apparatus includes a cutting condition setting unit for setting the cutting conditions in accordance with the depth of the hole being drilled and a control unit for controlling the rotary speed and movement position of the drill. The cutting condition setting unit defines the regions of the beginning part, the inner part, and the penetration part from the side close to the drill of the workpiece toward the depth direction of the hole of the workpiece in accordance with the depth of the hole when drilling a throughhole.

Control apparatus for drilling machine and drilling method

A main-shaft malfunction-state detector in an air bearing type machine tool, in which an abnormal contact of a main shaft with a housing is reliably and automatically detected. The contacting state of the main shaft,and the housing,is detected through the presence of electric conductivity by a contact detection device,A contact decision device,determines the contact of the main shaft,with the housing,based on the detected conductivity, thus automatic and certain preventative measures, such as the main shaft of the machine tool stops and so on, are based on the above decision.

Main-shaft malfunction-state detector in an air bearing type machine tool

A main-shaft malfunction-state detector in an air bearing type machine tool, in which an abnormal contact of a main shaft with a housing is reliably and automatically detected. The contacting state of the main shaft 11 and the housing 13 is detected through the presence of electric conductivity by a contact detection means 31. A contact decision means 32 determines the contact of the main shaft 11 with the housing 13 based on the detected conductivity, thus automatic and certain preventative measures, such as the main shaft of the machine tool stops and so on, are based on the above decision.

A profile processing method and a processing machine therefor which can obtain a good finish surface accuracy in all the carving surfaces and curb the decrease in tool's life are provided. More specifically, an end mill is first moved along an outermost side of an annular groove in carving the annular groove to a work. Consequently, the end mill is gradually moved to inside to be moved and carve along the annular groove. When the outermost side of the annular groove is carved, the movement path of the end mill is selected so that the outermost side is down-cut (counterclockwise in FIG. 5). When further inner side is carved, the movement path of the end mill is selected so that the direction of the relative movement path is opposite to the direction of the relative movement path when the outermost side is carved, in other words, the carved surfaces are down-cut by the end mill.

Profile processing method and processing machine therefor

A surface finishing method and a machine therefor, in which good finish accuracy can be obtained in all carving surfaces and deterioration of tool's life can be prevented. When a surface of a concave portion formed on a workpiece is carved, an end mill is first revolved along an outermost side of a slope, and is moved toward inside and revolved along a circumferential direction. When a surface of the slope is carved, a movement path of the end mill is selected so that the surface of the slope is down-cut. When a bottom is carved, the end mill is moved from inside to outside, in other words, the movement path is selected so that a surface of the bottom is down-cut.

Surface finishing method and machine for the same

A positioning control method (80) has a setting section (81) for setting a comparison reference value in accordance with a machine tool in advance, a detecting section (82) for detecting a command value by the rapid traverse command G00, a comparing section (83) for comparing the comparison reference value and the command value, and a determining section (84) for changing the rapid traverse command G00 to a linear interpolation command G01 when the command value is smaller than the comparison reference value, executing the rapid traverse value G00 when the command value is larger than the comparison reference value, and selecting either one of the rapid traverse command G00 or the linear interpolation command G01 when the comparison reference value is equal to the command value. Less effective short-distance rapid traverse command is converted to the linear interpolation command, thus speeding up positioning control to make an entire processing of the workpiece faster.

Positioning control method, numerical control apparatus, numerical

A machine with a worn detection function for a tool capable of reliably carrying out a worn detection for a tool. A present consumption power PW1 of a built-in motor 19, driving a main shaft 11, is watched and compared with a reference consumption power PW2, previously defined, by using a load meter 31, an A/D converter 32, a comparator 33 and a processing unit 34, thereby wear on the tool 12 is detected when the consumption power PW1 is larger than the reference consumption power PW2 as a cutting process is advanced. The main shaft 11 is supported by air static-pressure bearings 14 to 18, so that noise created with rotating, which exert an influence upon the consumption-power detected value, is extremely smaller as compared with the conventional antifriction bearing and so on. Thereby allowing delicate fluctuation of the consumption power to be detected, and naturally the worn detection for the tool 12 to be ensured.

Machine tool with worn-detection function for tool

The present invention provides an air bearing type machine tool capable of carrying out a process with a high load for cutting iron or the like and controlling the degree air is used. The air bearing type machine tool includes a main shaft, an air bearing supporting the main shaft, and an air pressure regulating device capable of regulating the pressure of air supplied to the air bearing. The air pressure regulating device, in turn, has an air feed portion supplying air to the air bearing, a processing load detection device for detecting the degree of processing load, a processing power detection device for detecting the degree of processing power, and an air pressure defining device for controlling the pressure of air fed from the air feed portion by using the detected values of the processing load and the processing power. The pressure of air supplied to the air bearing can be changed, so that the rigidity of the air baring can be changed in response to the processing load or the like, that is the process with from the low load to the high load can be carried out, with the result that the used air can be controlled at the minimal required amount.

Growing community of inventors

Numazu, Japan

Takeshi Momochi