The present invention relates to a socket alignment device for a bar loading magazine for guiding a bar of material to an automatic lathe, wherein a z-axis (z) is defined by the longitudinal axis of a bar of material (2) guided in the bar loading magazine, and wherein a first socket (1), into which the bar of material (2) is to be introduced for processing thereof in the automatic lathe along the z-axis, is arranged in the bar loading magazine, wherein the first socket (1) is mounted so as to be rotatable either coaxially about the z-axis (z) or about a rotational axis () parallel to the z-axis (z) and wherein at least one drive means (6) is included, which can be coupled at least to the first socket (1), specifically to the rotary drive of the first socket (1) about the z-axis (z) in such a manner that the first socket (1) and the cross-sectional profile of the bar of material (2) can be aligned flush with one another for introduction of the bar of material (2).

A lathe capable of facilitating maintenance of a chucking mechanism. A chuck operating apparatus includes a claw and a shifter to open and close a chuck provided on a spindle. The tilt claw provided outside the spindle has a first posture to bring the chuck into the opened state and a second posture to bring the chuck into the closed state. The shifter provided outside the spindle and movable in a spindle axis direction is brought in a first position to bring the claw into the first posture and in a second position to bring the claw into the second posture. A roller is mounted on the shifter in a contact position with the claw to roll in the spindle axis direction.

A machine tool is provided, which cuts a workpiece W by concurrently vibrating and moving the workpiece and a tool relatively by using a movement mechanism and a vibration mechanism while rotating a spindle by using a rotation mechanism, and which includes a determination means for determining the degree of wear of a distal end of the tool from a difference between a force component during a forward stroke and a force component during a return stroke in relative vibration of the workpiece and the tool. The force component is a force component of a force that is received by the tool from the workpiece and that is in a direction parallel to the direction of movement by the movement mechanism.

A machine tool is provided, which cuts a workpiece W by concurrently vibrating and moving the workpiece and a tool relatively by using a movement mechanism and a vibration mechanism while rotating a spindle by using a rotation mechanism, and which includes a determination means for determining the degree of wear of a distal end of the tool from a difference between a force component during a forward stroke and a force component during a return stroke in relative vibration of the workpiece and the tool. The force component is a force component of a force that is received by the tool from the workpiece and that is in a direction parallel to the direction of movement by the movement mechanism.

The machine tool system has a spindle that can move in an axial direction of a bar, a guide bush that supports the bar, a first tool post to which a first tool for machining a tip end part of the bar supported by the guide bush is attached, a pusher capable of biasing the bar toward the tip end side of the bar, a first control apparatus that controls operations of the spindle and operations of the first tool post, and a second control apparatus that controls operations of the pusher, wherein the first control apparatus includes a bar retraction mode in which the first tool post is caused to machine the tip end of the bar in a state where the bar is gripped by the spindle, the spindle is retracted and the bar is extracted from the guide bush, and the second control apparatus is caused to release the bias applied by the pusher and release the grip of the spindle on the bar.

The machine tool system has a spindle that can move in an axial direction of a bar, a guide bush that supports the bar, a first tool post to which a first tool for machining a tip end part of the bar supported by the guide bush is attached, a pusher capable of biasing the bar toward the tip end side of the bar, a first control apparatus that controls operations of the spindle and operations of the first tool post, and a second control apparatus that controls operations of the pusher, wherein the first control apparatus includes a bar retraction mode in which the first tool post is caused to machine the tip end of the bar in a state where the bar is gripped by the spindle, the spindle is retracted and the bar is extracted from the guide bush, and the second control apparatus is caused to release the bias applied by the pusher and release the grip of the spindle on the bar.

A method for identifying geometric errors in a machine tool includes the steps of: positioning a reference sphere so as to align its center with a centerline of a tool spindle; attaching a position measuring device having a gauge head to a rotation unit so as to direct the gauge head toward a rotation centerline of the rotation unit; acquiring displacement data relative to the center of the reference sphere by measuring positions of the reference sphere with the gauge head while rotating a rotation target (the swivel unit or the rotation unit) with the gauge head directed toward the center of the reference sphere, the displacement data being dependent on rotation angles of the rotation target; and identifying the geometric errors by least squares method using a mathematical expression having terms containing the geometric errors and representing displacement dependent on the rotation angles, and the displacement data.

A machining method for cutting process by making a workpiece (W) and a cutting tool (11) move relatively, characterized by using a cutting tool (11) comprising a cutting insert (28) having a first curved part (40a), a second curved part (40c) formed continuing from the first curved part (40a) and with a curvature smaller than the first curved part (40a), and a connecting part (40b) connecting the first curved part (40a) and the second curved part (40c) and by cutting while positioning the connecting part (40b) at the front end in the cut direction perpendicular to the direction of relative movement at the time of cutting.

A machining method for cutting process by making a workpiece (W) and a cutting tool (11) move relatively, characterized by using a cutting tool (11) comprising a cutting insert (28) having a first curved part (40a), a second curved part (40c) formed continuing from the first curved part (40a) and with a curvature smaller than the first curved part (40a), and a connecting part (40b) connecting the first curved part (40a) and the second curved part (40c) and by cutting while positioning the connecting part (40b) at the front end in the cut direction perpendicular to the direction of relative movement at the time of cutting.

A horizontal machining lathe with a shock-absorbing braking mechanism includes a lathe body including a lathe bed, a chuck, a spindle box, and a slide box. The chuck is arranged on an output end of the spindle box. The lathe bed is provided with the spindle box at one end of and a tailstock base at the other end. The lathe bed is provided with a guide rail, and the slide box is provided with a tool holder assembly. An end of the inner shaft proximate to the chuck is provided with a brake disc, and the spindle box is provided with a spindle braking device including first and second brake devices symmetrically arranged on both sides of the brake disc and a reset device arranged therebetween.