Cam-controlled grinding machine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsNobuo Fukuma, Hideyuki Matsubara
Life of this patent
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Abstract
In the cam-controlled "sizematic" type grinding method and apparatus therefor, a novel "in process" "gagematic" type measuring means has been introduced so as to maintain the strong points of the former and develop a new grinding method and apparatus capable of securing high precision and fine surface finish of workpieces at the same time. For attaining the above purpose (a) a novel process of comparing the timing of signals of reaching the target final dimension and lapsing of the minimum required "spark-out" grind time and (b) a compensation process for wear of the dresser point are introduced.
Claims3
In a cam-controlled grinding apparatus including a rotatable abrasive wheel mounted on the bed thereof and slidable in the axial direction of said wheel, a chuck, capable of holding a workpiece, disposed in confrontation with the abrasive wheel and rotatable about an axis substantially parallel to the wheel axis and furthermore movable in a direction normal to the wheel axis, a wheel feed mechanism for controlling the relative movement between said workpiece and said wheel by means of a cam, a dresser, including a dresser point, for dressing said wheel, and a dresser feed mechanism, the improvement of said grinding apparatus comprising:
- measuring means for measuring a dimension of the workpiece processed while grinding is taking place;
- final dimension signal means for issuing a final dimension signal as soon as the dimension measured by said measuring means has reached a predetermined target dimension;
- release means for separating the wheel from the workpiece in response to said final dimension signal;
- watching means for determining when sparkout grinding has proceeded for a predetermined period of time and for issuing a sparkout signal when said predetermined period of time has elapsed;
- comparison signal means for issuing a comparison signal in response to the comparison of the timing between said final dimension signal and said sparkout signal whenever said final dimension signal precedes said sparkout signal;
- and
- compensating means for compensating wear of said dresser point upon issuance of said comparison signal.
Dependencies are inferred from the claim text.