63results about How to "Avoid low machining accuracy" patented technology

There is provided a precision roll turning lathe includes: a bed 10; a headstock 12, mounted on the bed 10, for rotating a roll-shaped workpiece while holding one end of the workpiece by means of a chuck, said headstock having an indexing axis (C axis) for performing circumferential indexing of the workpiece; a tail stock 14, mounted on the bed 10 and disposed opposite the headstock 12, for rotatably supporting the other end of the workpiece; a carriage 16 including a saddle 26 mounted on the bed 10 movably in the longitudinal direction (Z-axis direction) of the workpiece, and a table 28 mounted on the saddle 26 movably in a direction (X-axis direction) perpendicular to the longitudinal direction of the workpiece; a tool swivel 30 mounted on the table 28 and having an indexing axis (B axis); a tool post 33 mounted on the tool swivel 30 and having a plurality of cutting tools 36 attached thereto; and a fly cutter spindle device 34 mounted to the tool post 33. The precision roll turning lathe can not only machine with high precision circumferential transverse grooves in the peripheral surface of a roll but can also machine with high precision longitudinal grooves in the peripheral surface.

A wire material having a copper-zinc alloy layer, which is formed by action of thermal diffusion, and a zinc layer on its circumference surface is subjected to processes, including from a step of drawing the wire material to a step of reducing the diameter of the product, to reliably crash the copper-zinc alloy layer into particles. The particles are embedded in the circumference surface of a core to integrate the diffusion alloy layer and zinc layer with the core and prevent the diffusion alloy layer and zinc layer from falling off from the core. In addition, in order to cover cracks formed in the copper-zinc alloy layer during wire drawing with a zinc thin film, wire drawing is performed at temperatures appropriate for maintaining good malleability and ductility of zinc.

A rotary index device in which the rotating shaft is held surely and stably after indexing. In the rotary index device of a machine tool comprising a rotating shaft provided rotatably in the housing and having an end portion to which a circular table is secured, and a clamp device for holding the rotational angular position of a body of revolution after indexing by making a pressing force act in the radial direction of the rotating shaft to the body of revolution including the rotating shaft, the clamp device includes a piston member provided displaceably in the axial direction of the rotatingshaft within the housing and having a tapered face formed on the side face, a means interposed between the body of revolution and the piston member, receiving a pressing force in the axial directionof rotation of the rotating shaft from the piston member as it displaces and making the pressing force act on the body of revolution while converting into the radial direction of the rotating shaft, and a means for urging the piston member in the direction for generating the pressing force from the pressing force conversion means.

The invention belongs to the technical field of numerically controlled lathes, and particularly relates to a numerically controlled lathe with a slant lathe bed and double spindles. The numerically controlled lathe comprises a protective cover, wherein the slant lathe bed is arranged in the protective cover, and a first spindle assembly and a saddle assembly are arranged on the slant lathe bed; two saddle guide rails and two second spindle guide rails are arranged on a guide rail mounting surface of the slant lathe bed, sliders are connected onto the saddle guide rails and the second spindle guide rails in a sliding manner, and the saddle assembly is connected onto the saddle guide rails through the sliders; a second spindle assembly opposite to the first spindle assembly is connected ontothe second spindle guide rails through the sliders in a sliding manner; and an oil cavity, an oil outlet tube and a power mechanism are arranged in each slider, a piston is connected to inside of theoil outlet tube in a sliding manner, a channel is connected between the oil outlet tube and the oil cavity, a one-way oil inlet valve is arranged on the channel, a one-way oil draining valve is arranged on the oil outlet tube, and multiple oil outlets are formed in the lower part of the slider. According to the numerically controlled lathe in the scheme, machining of two ends of a workpiece can be completed by one-time clamping of the workpiece, and the machining efficiency can be improved.

A machine tool in which machining precision can be prevented from lowering even in a case where a column deforms due to movement of a main spindle to each axial direction. A machine tool (1) for machining a work (W) by relatively moving a tool (T) and the work (W) comprises a saddle (16) for rotatably supporting a main spindle (19) to which the tool (T) is removably attached, a column (14) movably provided and movably supporting the saddle (16), and a column deformation detector (30) for detecting deformation of the column (14) caused by movement of at least one of the saddle (16) and the column (14), wherein movement of at least one of the tool (T) and the work (W) is corrected based on the detection result of the column deformation detector (30).

To provide a work transfer apparatus which can transfer works at high speed with controlling respectively the posture of the right and left of works. The work transfer apparatus includes an arm moving back and forth between machines in order to transfer work(s), a crossbar coupled to the arm, and a pair of right and left work holding devices provided at the left and right sides of the crossbar and tilt drive devices being provided on the arm, respectively controlling the work holding devices to rotate around an axis of a longitudinal direction of the crossbar.