Machining jig and processing method
A machining jig holds a workpiece with respect to a tool when machining the workpiece with the tool, the workpiece including a ridge that projects from an outer periphery of a cylindrical section in a radial direction and that extends so as to intersect a peripheral direction. The machining jig includes a holding jig that includes a cylindrical body section that is disposed at an outer periphery of the workpiece and a stopping section that projects inwardly from the body section and that stops a face of a surface of the ridge on a side where the tool leaves a processing portion of the ridge; and a coaxial base that is coaxial with the holding jig and to which the holding jig is coaxially fixed.
1. A machining jig that holds a workpiece when machining the workpiece with a tool, the workpiece including a ridge that projects from an outer periphery of a cylindrical section in a radial direction and that extends so as to intersect a peripheral direction, the machining jig comprising:
a holding jig that includes a cylindrical body section that is disposed at an outer periphery of the workpiece;
wherein the workpiece has a form of gear, and
wherein the ridge is a toothed portion of the gear,
wherein each toothed portion has an entry-side face on a first side thereof where the tool enters a processing portion of the toothed portion and an exit-side face on a second side thereof where the tool leaves the processing portion of the toothed portion, the second side being opposite the first side,
wherein the holding jig includes a stopping section that projects inwardly from the body section and that stops the exit-side face of the toothed portion where the tool leaves the processing portion of the toothed portion; and
a base that is coaxial with the holding jig and to which the holding jig is coaxially fixed.
2. The machining jig according to claim 1 , wherein the stopping section stops at least a surface of an end-side region of the ridge in a projection direction thereof.
3. The machining jig according to claim 1 , wherein the holding jig is such that a gap is formed between a surface other than the stopping section and a surface of the workpiece.
4. The machining jig according to claim 1 , further comprising a pressing section that presses the workpiece against a side of the holding jig.
5. The machining jig according to claim 1 , further comprising a circular cylindrical guide section that is coaxial with the holding jig and that is formed on an inner side of the holding jig,
wherein an inside diameter of the body section is larger than a tip circle diameter of the toothed portion,
wherein the number of the stopping sections is same as the number of the toothed portions,
wherein an axial-direction thickness of the stopping section is smaller than an axial-direction length of the toothed portion of the workpiece, and
wherein the stopping section includes a stopping surface and a facing surface, and a distance between the stopping surface and the facing surface, where the toothed portion is accommodated, is larger than a tooth thickness of the toothed portion that is accommodated.
6. A processing method in which a workpiece including a ridge that projects from an outer periphery of a cylindrical section in a radial direction and that extends so as to intersect a peripheral direction is machined with a tool such that a processing surface is formed in a direction that intersects a longitudinal direction of the ridge, the method comprising:
by using the machining jig according to claim 1 , stopping the exit-side face of the toothed portion by the stopping section near the processing portion of the toothed portion in an axial direction, and performing processing with the tool from a side opposite to a side where the toothed portion is stopped by the stopping section.
7. A machining jig that holds a workpiece when machining the workpiece with a tool, the workpiece including a ridge that projects from an outer periphery of a cylindrical section in a radial direction and that extends so as to intersect a peripheral direction, the machining jig comprising:
a holding jig that includes a cylindrical body section that is disposed at an outer periphery of the workpiece and a stopping section that projects inwardly from the body section and that stops a face of a surface of the ridge on a side where the tool leaves a processing portion of the ridge; and
a base that is coaxial with the holding jig and to which the holding jig is coaxially fixed,
wherein the workpiece has a form of a gear, and
wherein the ridge is a toothed portion of the gear,
further comprising a circular cylindrical guide section that is coaxial with the holding jig and that is formed on an inner side of the holding jig,
wherein an inside diameter of the body section is larger than a tip circle diameter of the toothed portion,
wherein the number of the stopping sections is same as the number of the toothed portions,
wherein an axial-direction thickness of the stopping section is smaller than an axial-direction length of the toothed portion of the workpiece, and
wherein the stopping section includes a stopping surface and a facing surface, and a distance between the stopping surface and the facing surface, where the toothed portion is accommodated, is larger than a tooth thickness of the toothed portion that is accommodated.