US 9,486,859 B2Granted

Drill

AssigneeMitsubishi Heavy Industries, Ltd.

InventorsYoshihito Fujita, Mikio Nakamura, Hirofumi Ienaga

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Abstract

A drill that exhibits improved drill-hole depth precision is provided. Said drill, which uses a tool (T) mounted to a main shaft (16) to drill a countersunk hole (Wh) into a workpiece (W), is provided with the following: a pressure foot (17) that presses on the surface of the workpiece (W) and suppresses vibration thereof; and a displacement sensor (18) that measures the distance (L), in the axial direction of the main shaft (16), between the pressure foot (17) pressing on the workpiece (W) and the end face (16a) of the main shaft (16), which is set to a prescribed reference distance (Lo). The axial position of the main shaft (16) is corrected using a correction distance (ΔL), i.e. the difference between the distance (L) measured by the displacement sensor (18) and the reference distance (Lo). After the main shaft (16) is set to the reference distance (Lo), the main shaft (16) is moved in the axial direction thereof in accordance with the depth of the countersink part (Whb) of the countersunk hole (Wh) and the tool (T) is used to drill the hole.

Claims4

Dependent claims

A drilling machine that machines a drill hole in a workpiece using a tool mounted on a main shaft, the drilling machine comprising:

a pressing member that presses the surface of the workpiece to suppress the vibration of the workpiece;
positioning means for positioning the main shaft so that an axial distance between the main shaft and the pressing member in a state where the workpiece is pressed, is a predetermined reference distance;
measuring means for measuring the axial distance between the main shaft positioned by the positioning means and the pressing member in the state where the workpiece is pressed;
position correcting means for obtaining a difference between the measurement distance measured by the measuring means and the reference distance as a correction distance, and correcting the axial position of the main shaft positioned by the positioning means, using the correction distance, to position the main shaft so that the axial distance between the main shaft and the pressing member in the state where the workpiece is pressed is the reference distance;
and
main shaft moving means for moving the main shaft positioned by the position correcting means in the axial direction thereof in accordance with the depth of the drill hole to perform drilling using the tool.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/375,599Filed 24 Feb 2012
Priority: JP 2012-02740910 Feb 2012
Published: US 2015/0016903 A115 Jan 2015
Granted: 8 Nov 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23B 49/00
Measuring or gauging equipment on boring machines for positioning or guiding the
B23Q 3/002
Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine: means to press a workpiece against a guide
B23Q 15/14
While the tool acts upon the workpiece: control or regulation of the orientation of the tool with respect to the work
B23Q 17/2233
For indicating or measuring existing or desired position of tool or work: for adjusting the tool relative to the workpiece