Abstract: A drilling work control method includes: automatically discriminating two or more working object layers where load torque applied to a drill forms a hole in a workpiece having plural forming areas formed of materials of different qualities; facilitating drilling work in a working condition set for each working object layer; and improving working efficiency. In a drilling work device that forms the hole in the workpiece having forming layers divided by materials of different qualities, a working object layer determining means determines the layers in order of drilling work based on start of drilling work and variation in load torque applied to the drill, a working condition deciding means decides a set working spindle speed and working feeding speed corresponding to forming materials of the respective layers, and a drive controlling means controls a spindle motor and feeding motor so that the drill forms the hole at the set speeds.

Abstract: A clamping device can clamp a processing object and a hole drilling apparatus with high accuracy, and maintain a stable thrust force with a small size. The clamping device clamps the hole drilling device that drills a hole through the processing object. The clamping device includes: a clamp plate drive unit disposed at the front end portion, on the processing object side, of the hole drilling apparatus; a clamp plate that advances and retreats along the machining shaft of the hole drilling apparatus in association with the clamp plate drive unit; a bush that advances and retreats integrally with the clamp plate, and a collet whose diameter is expanded by the advancing and retreating of the bush to be engaged with a jig plate for position definition of a drill (hole drilling tool) for drilling a hole through the processing object.

Abstract: A drive system can be simplified and downsized, improves its operability, and can be configured to clamp or unclamp a work at an accurate drive timing. This invention is a clamp device of a drill. This invention includes a clamp collet inserted into a hole formed in the work, a mandrels inserted slidably inside the clamp collet, a piston-cylinder mechanism reciprocating the mandrels axially, and a directional valve driving a piston. The directional valve includes a forward introduction port introducing a pressured fluid for advancing a ram of the drill, and a main introduction port introducing the main pressured fluid. When the pressured fluid is introduced to the forward introduction port, it is clamped by a one-way movement of the piston.

Abstract: A clamping device is attached to a front part of a body of a boring machine for clamping the boring machine and a workpiece together. The clamping device comprises a fixed piston fixed on the front part of the body, a movable piston equipped over the front part of the body movably in the axial direction of a spindle of the boring machine, a first pressure chamber, a second pressure chamber, a pressurized fluid-supply device to supply pressurized air to the first pressure chamber and the second pressure chamber so that the movable cylinder is moved in the axial direction, a connecting mechanism an end portion of which is connected to the movable cylinder, and a clamping unit which is connected to the other end portion of the connecting mechanism, and is fixed to a certain position of the workpiece.

Abstract: To provide a working unit ejecting mist of the excellent quality. A working unit includes a body, a ram, a forward and backward moving mechanism moving the ram forward and backward, a tool, a holding section holding the tool and moving forward and backward integrally with the ram, a spindle motor rotating the holding section, and a mist supply portion supplying mist mixed with air and cutting oil to the tool and works a workpiece while supplying the mist. The tool has through-holes supplying the mist to a cutting blade portion. The holding section includes a collet holding the tool and a collet holder having an inner cylindrical portion into which the collet is inserted with a communication hole to which the mist supplied from the mist supply portion 10 is introduced being formed from the inner cylindrical portion to an outer peripheral portion.

Abstract: A hydraulic feed-rate control apparatus pushes out a fluid by a main piston to a reservoir chamber via feed-rate adjustment mechanisms and flow passages and adjusts a feed rate of a reciprocating body; the adjustment mechanisms comprises first and second throttle valves arranged at front ends of a cylinder and adjusting flow rates of the fluid flowing into the flow passages; the main piston comprises an auxiliary piston integrally moving, and opening and closing the second throttle valve; and the auxiliary piston comprises an outer peripheral portion fitted in the second throttle valve and closed, a concave portion formed between a front portion and rear portion of the outer peripheral portion, a circulation hole formed in an inner peripheral portion of the auxiliary piston, rear-portion escape holes communicating the rear portion and the circulation hole, and concave-portion escape holes communicating the concave portion with the circulation hole.

Abstract: A clamping device is attached to a front part of a body of a boring machine for clamping the boring machine and a workpiece together. The clamping device comprises a fixed piston fixed on the front part of the body, a movable piston equipped over the front part of the body movably in the axial direction of a spindle of the boring machine, a first pressure chamber, a second pressure chamber, a pressurized fluid-supply device to supply pressurized air to the first pressure chamber and the second pressure chamber so that the movable cylinder is moved in the axial direction, a connecting mechanism an end portion of which is connected to the movable cylinder, and a clamping unit which is connected to the other end portion of the connecting mechanism, and is fixed to a certain position of the workpiece.

Abstract: The pneumatic drilling device includes: a ram provided inside a cylindrical body so that the ram can move forward and backward therein; a spindle air motor provided inside the ram; a feed air cylinder mechanism for moving the ram forward and backward; and an air supply port for supplying compressed air to the feed air cylinder mechanism and the spindle air motor through an airflow path. The airflow path includes: a first flow path for driving the spindle air motor; and a second flow path communicating with the feed air cylinder mechanism for moving the ram forward and backward. The first flow path and the second flow path are separately and independently provided in parallel.

Abstract: A drilling work control method includes: automatically discriminating two or more working object layers where load torque applied to a drill forms a hole in a workpiece having plural forming areas formed of materials of different qualities; facilitating drilling work in a working condition set for each working object layer; and improving working efficiency. In a drilling work device that forms the hole in the workpiece having forming layers divided by materials of different qualities, a working object layer determining means determines the layers in order of drilling work based on start of drilling work and variation in load torque applied to the drill, a working condition deciding means decides a set working spindle speed and working feeding speed corresponding to forming materials of the respective layers, and a drive controlling means controls a spindle motor and feeding motor so that the drill forms the hole at the set speeds.

Abstract: A hydraulic feed-rate control apparatus pushes out a fluid by a main piston to a reservoir chamber via feed-rate adjustment mechanisms and flow passages and adjusts a feed rate of a reciprocating body; the adjustment mechanisms comprises first and second throttle valves arranged at front ends of a cylinder and adjusting flow rates of the fluid flowing into the flow passages; the main piston comprises an auxiliary piston integrally moving, and opening and closing the second throttle valve; and the auxiliary piston comprises an outer peripheral portion fitted in the second throttle valve and closed, a concave portion formed between a front portion and rear portion of the outer peripheral portion, a circulation hole formed in an inner peripheral portion of the auxiliary piston, rear-portion escape holes communicating the rear portion and the circulation hole, and concave-portion escape holes communicating the concave portion with the circulation hole.

Abstract: A clamping device can clamp a processing object and a hole drilling apparatus with high accuracy, and maintain a stable thrust force with a small size. The clamping device clamps the hole drilling device that drills a hole through the processing object. The clamping device includes: a clamp plate drive unit disposed at the front end portion, on the processing object side, of the hole drilling apparatus; a clamp plate that advances and retreats along the machining shaft of the hole drilling apparatus in association with the clamp plate drive unit; a bush that advances and retreats integrally with the clamp plate, and a collet whose diameter is expanded by the advancing and retreating of the bush to be engaged with a jig plate for position definition of a drill (hole drilling tool) for drilling a hole through the processing object.

Abstract: To provide a working unit ejecting mist of the excellent quality. A working unit includes a body, a ram, a forward and backward moving mechanism moving the ram forward and backward, a tool, a holding section holding the tool and moving forward and backward integrally with the ram, a spindle motor rotating the holding section, and a mist supply portion supplying mist mixed with air and cutting oil to the tool and works a workpiece while supplying the mist. The tool has through-holes supplying the mist to a cutting blade portion. The holding section includes a collet holding the tool and a collet having an inner cylindrical portion into which the collet is inserted with a communication hole to which the mist supplied from the mist supply portion 10 is introduced being formed from the inner cylindrical portion to an outer peripheral portion.

Abstract: The pneumatic drilling device includes: a ram provided inside a cylindrical body so that the ram can move forward and backward therein; a spindle air motor provided inside the ram; a feed air cylinder mechanism for moving the ram forward and backward; and an air supply port for supplying compressed air to the feed air cylinder mechanism and the spindle air motor through an airflow path. The airflow path includes: a first flow path for driving the spindle air motor; and a second flow path communicating with the feed air cylinder mechanism for moving the ram forward and backward. The first flow path and the second flow path are separately and independently provided in parallel.