Provided is a hole drilling machine and the method for drilling an oval hole and an inner-diameter-changing hole by means of the hole drilling machine, the machine and the method being configured so that the oval hole can be shaped with high accuracy and drilling of a complicated hole such as the inner-diameter-changing hole can be performed with high accuracy. A hole drilling machine 100 includes a spindle 101 and an auxiliary spindle 120 holding both end portions of a processing tool 102 having a cutting blade 103. The spindle 101 includes a spindle drive motor 106 configured to rotatably displace the processing tool 102 on a circular path, and a tool turnable-drive motor 105 configured to spin the processing tool 102. The auxiliary spindle 120 includes an auxiliary spindle drive motor 120b. In the auxiliary spindle drive motor 120b, a tool fitting portion 120a in which a tip end portion of the processing tool 102 is slidably fitted is synchronously rotatably driven on the same circular path as that for the spindle 101. A table reciprocatably-displacing mechanism 111 is provided between the spindle 101 and the auxiliary spindle 120. The table reciprocatably-displacing mechanism 111 reciprocatably displaces a work piece WK in an X-axis direction perpendicular to an axial direction of the spindle 101.

Provided is a hole drilling machine and the method for drilling an oval hole and an inner-diameter-changing hole by means of the hole drilling machine, the machine and the method being configured so that the oval hole can be shaped with high accuracy and drilling of a complicated hole such as the inner-diameter-changing hole can be performed with high accuracy. A hole drilling machine 100 includes a spindle 101 and an auxiliary spindle 120 holding both end portions of a processing tool 102 having a cutting blade 103. The spindle 101 includes a spindle drive motor 106 configured to rotatably displace the processing tool 102 on a circular path, and a tool turnable-drive motor 105 configured to spin the processing tool 102. The auxiliary spindle 120 includes an auxiliary spindle drive motor 120b. In the auxiliary spindle drive motor 120b, a tool fitting portion 120a in which a tip end portion of the processing tool 102 is slidably fitted is synchronously rotatably driven on the same circular path as that for the spindle 101. A table reciprocatably-displacing mechanism 111 is provided between the spindle 101 and the auxiliary spindle 120. The table reciprocatably-displacing mechanism 111 reciprocatably displaces a work piece WK in an X-axis direction perpendicular to an axial direction of the spindle 101.

Provided is a hole drilling machine and the method for drilling an oval hole and an inner-diameter-changing hole by means of the hole drilling machine, the machine and the method being configured so that the oval hole can be shaped with high accuracy and drilling of a complicated hole such as the inner-diameter-changing hole can be performed with high accuracy. A hole drilling machine 100 includes a spindle 101 and an auxiliary spindle 120 holding both end portions of a processing tool 102 having a cutting blade 103. The spindle 101 includes a spindle drive motor 106 configured to rotatably displace the processing tool 102 on a circular path, and a tool turnable-drive motor 105 configured to spin the processing tool 102. The auxiliary spindle 120 includes an auxiliary spindle drive motor 120b. In the auxiliary spindle drive motor 120b, a tool fitting portion 120a in which a tip end portion of the processing tool 102 is slidably fitted is synchronously rotatably driven on the same circular path as that for the spindle 101. A table reciprocatably-displacing mechanism 111 is provided between the spindle 101 and the auxiliary spindle 120. The table reciprocatably-displacing mechanism 111 reciprocatably displaces a work piece WK in an X-axis direction perpendicular to an axial direction of the spindle 101.

Provided is a hole drilling machine and the method for drilling an oval hole and an inner-diameter-changing hole by means of the hole drilling machine, the machine and the method being configured so that the oval hole can be shaped with high accuracy and drilling of a complicated hole such as the inner-diameter-changing hole can be performed with high accuracy. A hole drilling machine 100 includes a spindle 101 and an auxiliary spindle 120 holding both end portions of a processing tool 102 having a cutting blade 103. The spindle 101 includes a spindle drive motor 106 configured to rotatably displace the processing tool 102 on a circular path, and a tool turnable-drive motor 105 configured to spin the processing tool 102. The auxiliary spindle 120 includes an auxiliary spindle drive motor 120b. In the auxiliary spindle drive motor 120b, a tool fitting portion 120a in which a tip end portion of the processing tool 102 is slidably fitted is synchronously rotatably driven on the same circular path as that for the spindle 101. A table reciprocatably-displacing mechanism 111 is provided between the spindle 101 and the auxiliary spindle 120. The table reciprocatably-displacing mechanism 111 reciprocatably displaces a work piece WK in an X-axis direction perpendicular to an axial direction of the spindle 101.

The invention relates to a double-sided drilling fixture for die-forged pistons and a double-sided drilling process thereof. It overcomes the defects of low efficiency and accuracy of the double-sided drilling operation for die-forged pistons in the prior art. The invention comprises a die-forged piston, a fixture base assembly, an upper load-resisting assembly and a lower expansion-resisting assembly. The upper load-resisting assembly is installed on the fixture base assembly and disposed above the die-forged piston. A fixation base, whose upper surface shape is the same as internal surface shape of the die-forged piston, is installed above the fixture base assembly. The die-forged piston is sleeved on the fixation base. The invention achieves simultaneous drilling on both sides of the two rear skirt surfaces of die-forged pistons and delivers quick clamping and automatic fixation, significantly reducing the difficulty in the assembly of drilling plate and workpiece and increasing the alignment accuracy.

The invention relates to a double-sided drilling fixture for die-forged pistons and a double-sided drilling process thereof. It overcomes the defects of low efficiency and accuracy of the double-sided drilling operation for die-forged pistons in the prior art. The invention comprises a die-forged piston, a fixture base assembly, an upper load-resisting assembly and a lower expansion-resisting assembly. The upper load-resisting assembly is installed on the fixture base assembly and disposed above the die-forged piston. A fixation base, whose upper surface shape is the same as internal surface shape of the die-forged piston, is installed above the fixture base assembly. The die-forged piston is sleeved on the fixation base. The invention achieves simultaneous drilling on both sides of the two rear skirt surfaces of die-forged pistons and delivers quick clamping and automatic fixation, significantly reducing the difficulty in the assembly of drilling plate and workpiece and increasing the alignment accuracy.

A machining tool for producing or machining bores, respectively, with high positional and/or surface quality, comprising a tool axis and a tool carrier section, which carries at least one tool blade and at least one guide rail, which radially supports the tool carrier section on a bore wall. The guide rail can be set with respect to its radial position and with respect to its tilt relative to the tool axis by means of a setting means, which engages with a guide rail carrier. In order to put together a tool, which operates highly precisely and with little effort, the guide rail carrier is connected via a material joint to a section that is fixed to the tool, thus either to the tool carrier section or a component, which can be firmly connected thereto, and the material joint can be blocked by means of the setting means.

A machining tool for producing or machining bores, respectively, with high positional and/or surface quality, comprising a tool axis and a tool carrier section, which carries at least one tool blade and at least one guide rail, which radially supports the tool carrier section on a bore wall. The guide rail can be set with respect to its radial position and with respect to its tilt relative to the tool axis by means of a setting means, which engages with a guide rail carrier. In order to put together a tool, which operates highly precisely and with little effort, the guide rail carrier is connected via a material joint to a section that is fixed to the tool, thus either to the tool carrier section or a component, which can be firmly connected thereto, and the material joint can be blocked by means of the setting means.

A drill jig apparatus configured to be coupled to a locomotive bedplate is presented. The apparatus can include a first member and a second member. The first member can be configured to attach a drill to provide stability while drilling, and the second member can be operably coupled to a locomotive, such as to an engine and bedplate of a locomotive. An engine dowel drilling system is also presented, which can include a drill jig member and a bushing member, and the members can be operably coupled with one another. A method of drilling holes in a locomotive bedplate can include using a drill jig and a bushing to facilitate drilling, and the drill jig can be a conductor-side jig or an engineer-side jig. A kit is also presented for engine dowel installation that can standardize dowels and dowel holes.

A drill jig apparatus configured to be coupled to a locomotive bedplate is presented. The apparatus can include a first member and a second member. The first member can be configured to attach a drill to provide stability while drilling, and the second member can be operably coupled to a locomotive, such as to an engine and bedplate of a locomotive. An engine dowel drilling system is also presented, which can include a drill jig member and a bushing member, and the members can be operably coupled with one another. A method of drilling holes in a locomotive bedplate can include using a drill jig and a bushing to facilitate drilling, and the drill jig can be a conductor-side jig or an engineer-side jig. A kit is also presented for engine dowel installation that can standardize dowels and dowel holes.