An apparatus for finishing an inside diameter of a work, in which inner surfaces of a plurality of bores to be finished, which are provided in the work and have diameters different from one another and axes parallel to one another, are subjected to a finishing treatment, and after completion of the finishing treatment, inside diameters of said bores are measured, said apparatus comprising:
- a retaining frame for retaining a plurality of the works at distances from one another in a direction of an X-axis perpendicular to the axis of each of said bores to be finished;
- a table movable in the direction of said X-axis;
- a single spindle having a rotational axis parallel to the axis of each of said bores and disposed on said movable table for advancing and retracting movements in an axial direction corresponding to the axes of said bores;
- a combination tool mounted at a tip end of said spindle and capable of performing the finishing treatment to the inner surfaces of said bores in accordance with a change in position of the tool inserted into each of said bores;
- and
- a measuring means insertable into each of said finished bores to measure an inside diameter of each of said finished bores, said measuring means being disposed on said movable table at a location displaced in the direction of the X-axis from said spindle, and capable of being advanced and retracted in a direction along the axis of each of said bores independently from said spindle;
- a correcting means provided on said spindle and capable of regulating the position of said combination tool in a radial direction of said spindle;
- a tool stocker in which a plurality of said combination tools are stocked in a manner that said plurality of combination tools can be alternatively brought into a previously established exchanging position to which said spindle can be moved and at which position a combination tool removed from the tip end of said spindle can be newly retained by the spindle;
- a deflection detector for detecting a deflection of said combination tool newly mounted at the tip end of said spindle in said exchanging position;
- a tool mounting and removing unit for carrying out the removal of said combination tool from the tip end of said spindle and the mounting of a new combination tool to the tip end of said spindle in said exchanging position;
- a tool cleaning means equipped on said tool stocker and capable of cleaning that portion of one combination tool retained in said tool stocker, which is to be mounted to said spindle;
- a spindle cleaning means equipped on said tool stocker and capable of cleaning the tip end of said spindle;
- and
- a control means for controlling the operations of said correcting means, said tool stocker, said tool mounting and removing unit, said tool cleaning means and said spindle cleaning means so as to regulate the position of the combination tool by said correcting means, based on a detection result provided by said deflection detector after the exchange of the tool in said exchanging position, or to carry out the cleaning by said tool cleaning means and said spindle cleaning means, wherein
- said spindle is provided at the tip end with a cam clamp mechanism which includes a clamp bolt rotatable about an axis perpendicular to the a rotational axis of said spindle and which is capable of being switched over between a clamping state of clamping said combination tool provided by rotating said clamp bolt in a forward direction, and an unclamping state of unclamping said combination tool provided by rotating said clamp bolt in a reverse direction, and
- said tool mounting and removing unit comprises:
- a moving member reciprocally movable in a direction perpendicular to the rotational axis of said spindle in said exchanging position;
- a moving member driving means for reciprocally moving said moving member;
- a rotary shaft carried on said moving member for rotation about an axis perpendicular to the rotational axis of said spindle;
- a wrench coaxially connected at a base end thereof to one end of said rotary shaft against relative rotation about the axis of said rotary shaft but for relative movement in a limited region in an axial direction of said rotary shaft, said wrench being capable of being brought into engagement with a tip end of said clamp bolt;
- a spring mounted under compression between the base end of said wrench and the one end of said rotary shaft;
- and
- a rotary shaft driving means capable of rotating said rotary shaft in either of the forward and reverse directions irrespective of the moved position of said moving member, and
- wherein the operations of said moving member driving means and said rotary shaft driving means are controlled by said control means, based on detection results provided by an engaged-state detector for detecting whether a tip end of said wrench has been brought into engagement with said clamp bolt, in accordance with the axial relative positions of said rotary shaft and said wrench, a rotation-number detector for detecting a number of rotations of said wrench in the reverse direction and an output torque detector for detecting an output torque in the forward direction from said rotary shaft driving means.