JP2008030162A - Gear tooth cutting method of pinion and pinion machined by using the cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent burrs from being generated on the end of the gear tooth cutting part when gear teeth are cut on a pinion blank with a hobbing machine. <P>SOLUTION: When the pinion blank 10 having a tapered surface 11 of both end surfaces of the gear tooth cutting part is cut with the hobbing machine, a dummy washer 102 is face-contacted to both end surfaces of the gear tooth cutting part of the pinion blank 10, and gear teeth are cut in a press fixed state. There is no occurrence of sags at the cut-in side end surface 10k, or there is no occurrence of burrs at the cut-out end surface 10n. The material having excellent machinability and a larger diameter than the tip diameter of the pinion blank 10 is used for the dummy washer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pinion gear cutting method and a pinion processed by using the processing method.

  FIG. 10 is an explanatory view of gear cutting on a pinion blank in the background art.

  Hereinafter, a conventional gear cutting method for a pinion blank in which both end surfaces of the gear cutting portion are tapered will be described with reference to FIG. A pinion blank 10 that forms a pinion by gear cutting has a cylindrical shape, has convex tapered surfaces 11 at both ends of the gear cutting portion, and a center hole 12 passes through the shaft center. In addition, it is possible to use a ferrous material (SUJ2 etc.) or an iron alloy (SUS etc.), a non-ferrous alloy (copper alloy etc.), and depending on the specifications of the pinion, it is necessary to increase the hardness by heat treatment in the subsequent process. An iron material is also used.

  When a pinion tooth profile is machined on the outer periphery of the pinion blank 10 using a hobbing machine, the metal core 1 is used as a machining jig. A tailstock (not shown) that is disposed opposite to the main shaft (not shown) of the hobbing machine and cooperates with the main shaft to support the workpiece is connected to the right end portion (not shown) of the core bar 1. 1 is rotatably held. When the pinion blank 10 is set on the hobbing machine, the pinion blank 10 is inserted into the core bar 1 through the center hole 12. In this state, the tailstock is moved to the left side (spindle side) on the headstock of the hobbing machine. The work holder 2 connected to the main shaft of the hobbing machine is provided with a metal core receiving hole 2a. The tip 1a of the metal core 1 is fitted into the metal core receiving hole 2a of the work holder 2, and further pushed. As a result, the pinion blank 10 is positioned at the center axis by the core bar 1, the vertical end surface 14 is strongly held between the core bar shoulder 1 b and the work holder end surface 2 b, and rotates while following the rotation of the hobbing machine spindle. Set to the state to be.

  When the setting of the pinion blank 10 on the hobbing machine is completed, the hob cutter 3 is rotated (R1), lowered in the direction of the pinion blank 10 (A direction), and further moved from right to left (B direction). The tooth profile is cut on the pinion blank 10 including the taper surface of the pinion blank. At this time, the pinion blank 10 itself also rotates (R2) according to the rotation of the main shaft, so that the tooth trace has a straight tooth profile while using the hob cutter 3. It can be created on the pinion blank 10. When the gear is cut, pull up the hob cutter (C direction) and move it from left to right (D direction) to return to the start position.

  After this, the pinion blank that has been trimmed (hereinafter, “pinion blank that has been trimmed” is simply referred to as “pinion”) is removed from the hobbing machine. (It may be simply abbreviated as “missing end face”) The burrs 13 generated in 10n are removed, and then the process proceeds to a heat treatment step.

  When the conventional pinion gear cutting method described in the background art is used, the burr 13 (see FIG. 10) is inevitably generated on the end face 10n. Also, although not as important as the problem of burrs, sagging due to cutting impact (roughness of the cutting surface) on the end surface of the pinion's gear cutting part on the side where the cutter cuts (hereinafter sometimes simply referred to as “cutting end surface”) Sometimes occurred.

  Conventionally, various methods such as a manual operation method, an etching method, a deburring method, and a barrel method have been used as a deburring operation after the gear cutting process. However, the manual method for removing the burr on the tooth surface created on the tapered surface requires a lot of man-hours and has the disadvantage that the quality varies. In addition, due to the pinion design, it was not possible to handle products that could not be chamfered. In the case of an etching method that dissolves and removes burrs with an etching solution, the work efficiency is high, but it is difficult to completely remove burrs, and new dimensions such as hole diameter and other non-purpose dimensions change. Problem has occurred. Also in the case of the deburring method using a bite or the like, it is difficult to completely remove burrs, and this method cannot be used depending on the location where burrs are generated. Further, in the case of the barrel method in which hard particles are sprayed to remove burrs, a new problem has arisen that dents, scratches, sagging, etc. occur in the product. In any case, it is extremely difficult and costly to remove burrs from the tooth surface created on the tapered surface.

  The present invention has been made to solve the above problems. As a means to solve, the invention according to claim 1 of the present invention is a gear cutting method in which both end surfaces of the gear cutting portion are cut into a pinion blank having a tapered surface by using a gear cutting machine to form a pinion. A pinion gear cutting method characterized in that a tooth washer is brought into surface contact with a tapered surface of a tooth cutting portion of a pinion blank, and gear cutting is performed in a state where the pinion blank and the waste washer are pressed and fixed.

  Further, the invention according to claim 2 of the present invention is a gear cutting method in which a pinion blank is formed by cutting a pinion blank having both end surfaces of a gear cutting portion into a tapered surface using a gear cutting machine. A pinion gear cutting method characterized in that a tooth washer is brought into surface contact with the end face on the side where the cutter comes off at the gear cutting part and the pinion blank and the waste washer are pressed and fixed. It is.

  According to a third aspect of the present invention, there is provided a tooth that forms a pinion by cutting a pinion blank having a tapered surface at least one of the shapes of the end portions of the gear cutting portion different from each other using a gear cutting machine. In the cutting method, the both ends of the pinion blank to be geared are brought into surface contact with a waste washer that matches the shape of the both ends, and the pinion blank and the waste washer are pressed and fixed to perform gear cutting. A pinion gear cutting method characterized by the following.

  Further, the invention according to claim 4 of the present invention is a gear cutting process in which a pinion is formed by cutting a plurality of pinion blanks having both end surfaces of the gear cutting portion connected to each other using a gear cutting machine. In the method, among the plurality of pinion blanks, the end surface on the side where the cutter of the pinion blank to be cut last is pulled out, between each pinion blank, and among the plurality of pinion blanks, the first gear cutting is performed. A pinion blank cutter is provided in contact with the end face of each pinion blank cutter, and a plurality of pinion blanks and each washer are pressed and fixed in a state of gear cutting. This is a pinion gear cutting method.

  The invention according to claim 5 of the present invention is the pinion gear cutting method characterized in that a diameter equal to or larger than the diameter of the tip circle of the pinion blank is used for the discard washer.

  Further, the invention according to claim 6 of the present invention is a pinion gear cutting method characterized in that a material that is the same as the material of the pinion blank or a good cutting property is used for the washer. .

  The invention according to claim 7 of the present invention is a pinion processed using the pinion gear cutting method of the present invention.

  As an effect of the invention, when the pinion gear cutting method of the present invention according to claim 1 is used, both end surfaces of the gear cutting portion are tapered surfaces of the pinion blank with respect to the pinion blank of the taper surface, Since the tooth washer is processed in a state where the washer is brought into surface contact and pressed and fixed, there is no sagging at the cut end face, and there is no burring at the end face.

  Further, when the pinion gear cutting method of the present invention according to claim 2 is used, both the end faces of the gear cutting portion are brought into contact with the pinion blank having a tapered surface, and the throwing washer is brought into surface contact with the pinion blank and pressed and fixed. Since the gear cutting is performed in the state, the occurrence of burrs on the missing end face which is the most problematic in gear cutting to the pinion blank is eliminated.

  Further, when the pinion gear cutting method of the present invention according to claim 3 is used, both end portions for gear cutting with respect to a pinion blank having a tapered surface in at least one of the different shapes of both end surfaces of the gear cutting portion. In addition, since the pinion blank and the washer are pressed and fixed in a state where the pin washer is brought into surface contact with the shape of the both end portions, the sagging process is eliminated, and there is no occurrence of sagging at the cut end surface. No burrs will be generated.

  In addition, when the pinion gear cutting method of the present invention according to claim 4 is used, in the gear cutting processing method of forming a pinion by cutting teeth in a state where a plurality of pinion blanks having tapered end faces are connected, Among the pinion blanks that are connected in series, the pinion blank that is the last of the pinion blanks to be cut off, the end surface of the pinion blank on the side where the cutter comes out, and between the pinion blanks, and the pinion blank that is the first of the plurality of connected pinion blanks Since the washer is in surface contact with the end face on the side where the cutter is cut, the pinion blanks connected to each other and the respective waste washers are pressed and fixed, so a plurality of pinion blanks are processed. Even if gear cutting is performed at once, no sag is generated on the cut end face of all pinion blanks, and burrs are generated on the end face. Also eliminated.

  Further, in the pinion gear cutting method of the present invention according to claim 5, since a washer having a diameter equal to or larger than the diameter of the tip circle of the pinion blank is used, the sagging all edges of the tooth profile processed using the discard washer And burr generation is eliminated.

  Further, when the pinion gear cutting method of the present invention according to claim 6 is used, a material having good cutting properties is used for the washer, so that when the washer is prepared by cutting from the material, Processing when cutting together with the pinion blank while making surface contact with the blank becomes easy.

  In addition, the pinion processed using the pinion gear cutting method of the present invention according to claim 7 does not require a deburring operation that tends to impair the quality when it is processed by providing a washer on the end face. When the washer is provided with a washer on the cut end face, sagging at the cut end face is eliminated and the quality of the pinion is improved.

  Next, the best mode for carrying out the present invention (hereinafter abbreviated as “embodiment”) will be described with reference to FIGS. FIG. 1 is an explanatory diagram of gear cutting when a waste washer is pressed and fixed to both end surfaces of a pinion blank in which both end surfaces of the gear cutting portion have tapered surfaces in the first embodiment of the present invention, FIG. In the second embodiment of the present invention, the gear cutting processing explanatory diagram when the both ends of the gear cutting portion are pressed and fixed while bringing the washer into contact with the slipping end surface of the pinion blank having a tapered surface, FIG. 3 shows the present invention. In the third embodiment of the present invention, the gear cutting processing explanatory diagram, when one of the both end faces of the gear cutting portion is a taper surface and the other is different in shape while pressing and fixing the waste washer to the both end faces of the pinion blank. 4 is a fourth embodiment of the present invention, in which a plurality of pinion blanks having both end surfaces of the gear cutting portions having tapered surfaces are connected to each other, and the pinion blanking is finally performed among the connected pinion blanks. In the state where a blank washer is provided in surface contact with each other on the blank end face, between each pinion blank, and on the cut end face of the pinion blank to be geared first, among the connected pinion blanks. It is gear cutting process explanatory drawing. In addition, the same number is attached | subjected to the same thing by the components and operation | movement used in background art.

  The pinion blank 10 shown in FIG. 1 and used in the first embodiment of the present invention is the same as the pinion blank 10 in FIG. 10 described in the peripheral technology, and an iron material (SUJ2 or the like) is used as a material, and its shape is It is a cylinder having a convex tapered surface 11 at its end, and a center hole 12 passes through the axis.

  When gear cutting is performed on the pinion blank 10 with a hobbing machine, the shaft diameter (d1) of the cored bar shaft 101a, which is the tip of the cored bar 101 inserted into the center hole 12 of the pinion blank 10, is larger than in the case of peripheral technology. Keep it thin. As a result, the cored bar 101a has a larger clearance (c1) than the conventional one with the center hole 12 of the pinion blank 10.

  The two discarded washers 102 used in the first embodiment have the same shape because both ends including the tapered surface of the pinion are symmetrical, and have a short outer diameter slightly larger than the outer diameter of the pinion blank 10. As an example of the actual size of the present application, the diameter of the washer is 10.0 mm while the diameter of the pinion blank 10 is 9.8 mm and the tooth tip circle diameter after cutting is 9.6 mm. The end face on one side of the washer has a concave tapered surface 102a having the same inclination as the tapered surface 11 of the pinion blank 10. Further, the center hole 102b provided at the center has a diameter capable of inserting the cored bar shaft 101a with a small clearance. Further, as the material of the washer 102, a material having good cutting properties (for example, brass) or the same material as the pinion blank 10 is used.

  When the pinion blank 10 of FIG. 1 is set on the hobbing machine, first, the right washer 102 is inserted from the left end of the core shaft 101a with the tapered surface 102a facing the work holder 112, and then the pinion blank 10 10 and finally the left washer 102 is inserted with its tapered surface 102a facing the pinion blank 10 side. In this state, the tail stock is moved to the main shaft side (left side), and the tip 101b of the cored bar is fitted into the cored bar receiving hole 112b of the work holder 112 and pushed in, so that the left washer 102 and the pinion blank are inserted. 10 and the right washer 102 are pressed against the main shaft. As a result, the pinion blank 10 has a center axis position determined along the tapered surfaces 102a of the left and right washer 102, and at the same time, following the rotation of the hobbing spindle by the frictional force applied to the left and right tapered surfaces 11. Set to rotate.

  When the setting of the pinion blank 10 on the hobbing machine is completed, the gear cutting process is started. That is, while rotating the hob cutter 3 (R1), the hob cutter 3 is lowered in the direction of the pinion blank 10 (A direction), and further moved from the right to the left (B direction) to cut the tooth profile on the pinion blank 10. At this time, the pinion blank 10 itself also rotates (R2) according to the rotation of the main shaft, so that it is possible to create a tooth profile with straight teeth on the pinion blank 10 while using the hob cutter 3. When the gear is cut, pull up the hob cutter (C direction) and move it from left to right (D direction) to return to the start position.

  When the gear cutting method according to the first embodiment is used, the discard washer 102 provided on the cut end face 10k reduces the impact at the time of cut and eliminates sagging at the cut end face 10k. Further, since the burrs are not generated on the end face 10n by the discard washer 102 provided on the end face 10n, man-hours are required, and the need for deburring work that easily impairs the pinion quality is eliminated. In addition, since the alignment of the center hole 12 of the pinion blank 10 and the center of the tooth profile is performed on the tapered surface 11 of the pinion blank 10, the core metal shaft 101a and the center hole 12 of the pinion blank 10 must be tightly fitted. Compared to the conventional centering that must be performed, the workpiece can be easily attached and detached during processing, and the center hole 12 of the pinion blank 10 is less damaged and the misalignment between the tooth profile and the center hole 12 of the pinion blank 10 is reduced. effective.

  Next, a description of the second embodiment will be made. The pinion blank 10 and the washer 102 shown in FIG. 2 and used in the second embodiment of the present invention are the same as those used in the description of the first embodiment. That is, the pinion blank 10 uses iron (SUJ2 or the like) as a material, and its shape is a cylinder having a convex tapered surface 11 at the end, and a center hole 12 passes through the axis. The washer 102 has a short cylindrical shape having an outer diameter slightly larger than the outer diameter of the pinion blank 10, and has a concave tapered surface 102 a at the same inclination as the tapered surface 11 of the pinion blank 10 on one end surface. Further, the center hole 102b provided at the center has a diameter capable of inserting the cored bar shaft 101a with a small clearance. Further, as the material of the washer 102, a material having good cutting properties (for example, brass) or the same material as the pinion blank 10 is used.

The biggest difference of the second embodiment compared to the first embodiment is that in the second embodiment, the waste washer 102 is provided only on the end face 10n. Therefore, in the second embodiment, in order to center the pinion blank, the cored bar shaft 201a of the cored bar 201 is partially thickened (d2) so as to be tightly fitted with the center hole 12 at the right end. Yes. (Except for the right end, it has the same shaft diameter (d1) as that of the first embodiment and is loosely fitted with the center hole 12. Also, except for the length of the cored bar shaft, other configurations are the first embodiment. Equivalent to form.)

  When setting the pinion blank 10 of FIG. 2 on the hobbing machine, first, the pinion blank 10 is inserted from the left end of the cored bar shaft 201a, then the washer 102 is inserted with the tapered surface 102a facing the pinion blank 10 side. To do. In this state, the tail stock is moved to the main shaft side (left side), and the tip of the metal core is fitted into the metal core receiving hole 112b of the work holder 112 and pushed in, whereby the washer 102 and the pinion blank 10 are moved to the main shaft. Pressed to the side. As a result, the central axis position of the pinion blank 10 is on the left side by surface contact between the tapered surface 102a of the washer 102 and the left tapered surface 11 of the pinion blank 10, and on the right side, the core shaft 201a and the pinion blank 10 It is determined by fitting with 10 center holes 12. At the same time, the pinion blank 10 is strongly held between the core bar 201 and the work holder 112 and is set in a state of rotating while following the rotation of the hobbing spindle.

  When the setting of the pinion blank 10 on the hobbing machine is completed, the gear cutting process is started. That is, while supplying the cutting oil and rotating the hob cutter 3 (R1), it is lowered in the direction of the pinion blank 10 (A direction), and further moved from the right to the left (B direction) to cut the tooth profile on the pinion blank 10 I will do it. At this time, the pinion blank 10 itself also rotates (R2) according to the rotation of the main shaft, so that it is possible to create a tooth profile with straight teeth on the pinion blank 10 while using the hob cutter 3. When the gear is cut, pull up the hob cutter (C direction) and move it from left to right (D direction) to return to the start position. In the description of the present embodiment, the rotation (R1) of the hob cutter 3 is described and illustrated by up-cutting with respect to the cut object, but can also be applied to cutting by down-cutting. Occurs on the opposite side of the object. The same applies to the following description.

  When the gear cutting method according to the second embodiment is used, the taper surface 10n is cut similarly to the first embodiment, and the pinion that creates the gear cut on the taper surface is discarded on the side of the end face 10n. The washer 102 can prevent burrs from occurring on the end face 10n, which is the most problematic for pinion gear cutting. The center hole 12 of the pinion blank 10 and the center of the tooth profile are aligned with the tapered surface 11 of the pinion blank on the left side and the center hole 12 of the pinion blank on the right side. Thus, the working efficiency is improved, and even when one single washer 102 is used, the center hole 12 of the pinion blank 10 can be damaged and the runout can be suppressed to a small extent.

  Next, a description of the third embodiment will be made. The pinion blank 300 shown in FIG. 3 and used in the third embodiment of the present invention has a cylindrical shape with a center hole 312, and the end surface of the gear cutting portion has a tapered surface 311 on the left side and a vertical surface 313 on the right side. have. Therefore, the washer also has an end face that matches the shape of both ends. That is, the left washer 302 has a short cylindrical shape having an outer diameter slightly larger than the outer diameter of the pinion blank 300, and a concave tapered surface 302 a having the same inclination as the tapered surface 311 of the pinion blank 300 is formed on one end surface. Have. Further, the center has a center hole 302b. The right washer 303 is a short cylinder having an outer diameter slightly larger than the outer diameter of the pinion blank 300, has a vertical end face 303a, and has a center hole 303b at the center thereof. As the material of the washer 302, 303, a good cutting property (for example, brass) is used.

  During gear cutting, the cored bar shaft 301a of the cored bar 301 provided on the tailstock passes through the center hole 303b of the right side washer 303, the center hole 312 of the pinion blank 300, and the center hole 302b of the left side washer 302. Then, the washer 302, 303 is pressed and fixed to the both end surfaces 311, 313 of the pinion blank 300 while being in surface contact. In this case, the center of the pinion blank 300 is necessary due to the need for centering of the pinion blank 300. A portion of the cored bar shaft 301a that fits in the hole 312 is partially thickened (d3) at the right end so as to be fitted to the center hole 312 with a small clearance. (The cored bar shaft 301a fits loosely with the center hole 312 of the pinion blank 300 except for the right end portion, and with a small clearance from the center hole 302b of the left washer 302. It has an insertable diameter.)

  When the gear cutting method according to the third embodiment is used, for the pinion blank 300 having different shapes at both end surfaces of the gear cutting portion, the washer 302, 303 matching the shape of the both end portions is provided at both ends to be geared. Since gear cutting is performed in a state where the surfaces are brought into contact with each other and pressed, the impact of cutting on the pinion blank 300 is reduced, the occurrence of sagging at the cut end surface 300k is eliminated, and the occurrence of burrs at the exit end surface 300n is eliminated. Improve the quality.

  Next, a description of the fourth embodiment will be made. The two pinion blanks 10 shown in FIG. 4 and used in the fourth embodiment of the present invention are the same as the pinion blanks 10 in FIG. 10 described in the peripheral technology, and the shape thereof is a tapered surface convex at the end. A center hole 12 passes through the axial center of the cylinder. In the fourth embodiment, gear cutting is performed in a state where a plurality (two) of the pinion blanks 10 are connected. That is, among the connected pinion blanks 10, the pinion blank 10 to be geared at the end of the pinion blank 10 n and the pinion blank 10 between the two pinion blanks 10 and the pinion blank 10 to be geared first. Discarding washers 102, 402, 102 are provided in surface contact with the cut end face 10k of the blank 10, respectively.

  Two discard washers, that is, the discard washer 102 used for the end face 10n of the pinion blank 10 to be geared last and the discard washer 102 used for the cut end face 10k of the pinion blank 10 to be geared first, are the first. It has the same shape as the embodiment. That is, it has a short cylindrical shape having an outer diameter slightly larger than the outer diameter of the pinion blank 10, and has a concave tapered surface 102 a at the same inclination as the tapered surface 11 of the pinion blank 10 on one end surface. Moreover, the center hole 102b provided in the center has a diameter in which the cored bar shaft 401a of the cored bar 401 can be inserted with a small clearance. Further, as the material of the washer 102, a material having good cutting properties (for example, brass) or the same material as the pinion blank 10 is used.

  The middle washer 402 is in the form of a short cylinder having an outer diameter slightly larger than the outer diameter of the pinion blank 10, and a concave tapered surface 402 a having the same inclination as the tapered surface 11 of the pinion blank 10 is provided on both end surfaces thereof. It is. Moreover, the center hole 402b provided in the center has a diameter in which the cored bar shaft 401a can be inserted with a small clearance. Further, the material of the washer 402 is made of a material having good cutting properties (for example, brass) or the same material as the pinion blank 10.

  When gear cutting is performed on the two pinion blanks 10 connected by the hobbing machine, the length of the cored bar shaft 401a inserted into the center hole 12 of the pinion blank 10 is longer than that of the first embodiment. It is only long, and the shaft diameter (d1) and the clearance with the center hole 12 of the pinion blank 10 are the same.

  When setting the pinion blank 10 of FIG. 4 on the hobbing machine, first, the right washer 102 is inserted from the left end of the cored bar shaft 401a with the tapered surface 102a facing the work holder 112, and then the right side of the right side washer. Next, the pinion blank 10, the middle washer 402, the left pinion blank 10, and finally the left washer 102 are inserted with the tapered surface 102 a facing the pinion blank 10. In this state, the tail stock is moved to the main shaft side, and the tip 401b of the cored bar is fitted into the cored bar receiving hole 112b of the work holder 112 and pushed in, so that the left washer 102 and the left pinion blank are 10, the middle washer 402, the right pinion blank 10, and the right washer 102 are pressed against the spindle in a skewered state. As a result, the two pinion blanks 10 have their center axis positions determined by the tapered surfaces 102 a of the left and right washer 102 and the tapered surface 402 a of the middle washer 402, and are formed on the tapered surface 11 of the pinion blank 10. It is set in a state of rotating while following the rotation of the hobbing spindle by the frictional force received.

  After the work set is completed, the gear cutting process is started. In the present embodiment, except that a part of the left and right waste washers 102 and the middle waste washer 402 are cut together with the pinion blank 10. The processing steps are the same as those in the first embodiment. That is, while rotating the hob cutter 3 (R1), the hob cutter 3 is lowered in the direction of the right pinion blank 10 (A direction), and first moved to the right washer 102 from the right to the left (B direction). The tooth profile is cut to the right pinion blank 10, subsequently to the middle washer 402, then to the left pinion blank 10, and finally to the left washer 102. At this time, the pinion blank 10 itself also rotates (R2) according to the rotation of the main shaft, so that it is possible to create a tooth profile with straight teeth on the pinion blank 10 while using the hob cutter 3. When the gear is cut, pull up the hob cutter (C direction) and move it from left to right (D direction) to return to the start position.

  When the gear cutting method of the fourth embodiment is used, the impact when the right pinion blank 10 is cut is reduced by the discarded washer 102 provided on the cut end face 10k of the right pinion blank 10, and the cut end face 10k No sagging occurs. Further, the waste washer 402 provided in the middle prevents burrs from occurring on the exit end face 10n of the right pinion blank 10, and eliminates the occurrence of sagging at the cut end face 10k of the left pinion blank 10. In addition, due to the washer 102 provided on the left end face 10n of the left pinion blank 10, no burr is generated on the left end face 10n of the left pinion blank 10. As a result, even if the production efficiency is increased by cutting the plurality of pinion blanks 10 in one set, man-hours are required, and the need for deburring work that easily impairs the pinion quality is eliminated. Further, since the cutting impact on the pinion blank 10 is reduced, sagging at the cutting end surface 10k is eliminated. Further, since the center hole 12 of the pinion blank 10 and the center of the tooth profile are aligned on the tapered surface 11 of the pinion blank 10, the cored bar shaft 401a and the center hole 12 of the pinion blank 10 are tightly fitted. Compared to the conventional centering that must be performed, the workpiece can be easily attached and detached during processing, and the center hole 12 of the pinion blank 10 is damaged and the misalignment between the tooth profile and the center hole 12 of the pinion blank 10 is also caused. There is an effect to reduce.

  In addition, in the fourth embodiment, in order to explain the gist of the invention in a simple manner, it has been described in the case of two continuous connection. However, as long as there is no problem in machining accuracy due to the operating range of the hobbing cutter or the deflection of the core bar shaft, If a large number of pieces are connected together, the production efficiency is further increased.

  Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 5 is an explanatory diagram of the first embodiment of the pinion gear cutting method of the present invention, FIG. 6 is an explanatory diagram of the second embodiment of the pinion gear cutting method of the present invention, and FIG. 7 is an illustration of the pinion of the present invention. FIG. 8 is an explanatory diagram of a fourth embodiment of the pinion gear cutting method of the present invention, and FIG. 9 is a fifth embodiment of the pinion gear cutting method of the present invention. It is explanatory drawing of an example. In addition, the same number is attached | subjected to the same thing as the component and operation | movement used by description of the 1st embodiment-the 4th embodiment, and the description is simplified or abbreviate | omitted.

  The first embodiment of the present invention described with reference to FIG. 5 is obtained by partially changing the shaft diameter of the cored bar shaft of the first embodiment. That is, the core metal 501 is used in which the shaft diameter (d5) of the portion located in the pinion blank 10 and the shaft diameter (d4) of the portion fitted into the work holder 512 are thinner than those in the first embodiment.

  As a result, in addition to the effects described in the first embodiment, an effect unique to the first embodiment that makes it easy to attach and detach the washer 102 can be obtained.

  Next, the second embodiment of the present invention will be described with reference to FIG. The second embodiment is also a modification of the first embodiment of the present invention, and both ends of the gear cutting portion of the pinion blank 600 are convex tapered surfaces 611, but are different from the pinion blank used in the first embodiment. There is no center hole, and a tenon 612 is attached instead. For this reason, the washer 602 has a concave tapered surface 602a and a center hole 602b.

  Also in this embodiment, the left and right tapered surfaces 611 are used for centering the pinion blank 600. That is, the pinion blank 600 and the waste washer 602 are pressed and fixed by the work holder 613 and the core metal 601 while the tapered surface 611 of the pinion blank 600 and the concave tapered surface 602a provided on the waste washer 602 are in surface contact. Then, the pinion blank 600 is geared together with a part of the washer 602.

  As an effect of the second embodiment, the cutting impact is reduced by the discard washer 602 provided on the cut end surface 600k, the occurrence of the sagging of the cut end surface 600k is eliminated, and the removal end surface 602 provided on the drop end surface 600n is eliminated. Deburring of 600 n is eliminated, man-hours are required, and an effect of eliminating the deburring operation that easily impairs product quality can be obtained.

  Next, a third example described with reference to FIG. 7 is a partial modification of the third embodiment of the present invention, and both end surfaces of the gear cutting portion of the pinion blank 700 have tapered surfaces 711R and 711L. However, this is the case when the taper shape is different on the left and right.

  Also in the case of the present embodiment, the taper surfaces 711 </ b> R and 711 </ b> L of the end surfaces of the gear cutting portions are used for centering the pinion blank 700. That is, the tapered surface 702a of the right washer 702 is brought into surface contact with the cut end surface 700k of the pinion blank 700 and the tapered surface 703a of the left washer 703 is brought into surface contact with the detaching end surface 700n on the main shaft of the gear cutter. The pinion blank 700 and the left and right discarded washers 702 and 703 are pressed and fixed using the core metal 701 and the work holder 712, and then the pinion blank 700 is geared. In the third embodiment of the present application, both end surfaces are described and illustrated as tapered surfaces. However, not only the tapered surfaces but also the surfaces where the end surfaces are formed as R surfaces are concave shapes that match the shape of the contact surface of the washer. It is possible to apply an application such as forming a round shape, making the surface contact, and gearing while pressing and fixing.

  As an effect of the third embodiment, the cutting impact is reduced by the discard washer 702 provided on the cut end surface 700k, the occurrence of the sagging of the cut end surface 700k is eliminated, and the waste washer 703 provided on the drop end surface 700n is used. The generation of burrs of 700n is eliminated, man-hours are required, and the deburring operation that easily impairs the product quality is unnecessary.

  Next, with reference to FIG. 8, a case will be described as a fourth embodiment where the both end surfaces of the gear cutting portion are vertical and gear cutting is performed on the pinion blank 800 with the center hole 812.

  The two discarded washers 802 used in this embodiment have straight end faces and a center hole 802a at the center. The discard washer 802 is brought into surface contact with both end surfaces of the gear cutting portion of the pinion blank 800, and gear cutting is performed while pressing and fixing using the core metal 801 and the work holder 812. In this embodiment, the pinion blank 800 is centered so that the shaft diameter (d8) of the core metal shaft 801a of the core metal 801 can be inserted into the center hole 812 of the pinion blank 800 with as little clearance as possible.

  As an effect of the fourth embodiment, the cutting impact is reduced by the discard washer 802 provided on the cut end surface 800k, the occurrence of the sagging of the cut end surface 800k is eliminated, and the waste end face 802 provided on the cut end surface 800n is used. As a result, the generation of burrs of 800 n is eliminated, man-hours are required, and the deburring operation that easily impairs the product quality is unnecessary.

  Next, with reference to FIG. 9, the washer 902 is brought into surface contact with both end surfaces of the gear cutting portion of the pinion blank 900 with respect to the pinion blank 900 having both end surfaces of the gear cutting portion which are vertical and provided with the relief 912. A case where gear cutting is performed while pressing and fixing using the gold 901 and the work holder 913 will be described as a fifth embodiment.

  In the present embodiment, the left and right tenons 912 are used for centering the pinion blank 900. The two washer 902s have a cylindrical shape whose outer diameter is slightly larger than the outer diameter of the pinion blank 900, the end face is straight, and has a center hole 902a in the center.

  As an effect of the fifth embodiment, the cutting impact is reduced by the discard washer 902 provided on the cut end face 900k, the occurrence of the sagging of the cut end face 900k is eliminated, and the drop end face 902 provided on the drop end face 900n is used. As a result, the occurrence of burrs of 900 n is eliminated, man-hours are required, and the deburring operation that easily impairs the product quality is unnecessary.

  As described above in detail, by using the pinion gear cutting method of the present invention, it is possible to prevent the occurrence of burrs during gear cutting, eliminate the occurrence of sagging during cutting, and facilitate pinions with less eccentricity. Can be processed. As a result, the pinion produced using the processing method of the present invention is excellent in quality and stable.

  The present invention has been described above using the case of pinion gear cutting. However, this invention is not limited to pinion gear cutting, but any machining that reduces cutting impact and sagging at the cutting end face, avoids burrs on the pulling end face, and suppresses eccentricity due to secondary machining. The effect is demonstrated.

In 1st Embodiment of this invention, it is gear cutting process explanatory drawing at the time of pressing and fixing a waste washer to the both end surfaces of the pinion blank which the both end surfaces of the gear cutting part made the taper surface contact. In 2nd Embodiment of this invention, it is a gear cutting process explanatory drawing at the time of pressing and fixing a waste washer to surface contact | abutting to the pull-out end surface of the pinion blank which the both end surfaces of the gear cutting part made the taper surface. In the third embodiment of the present invention, the gear cutting processing explanatory diagram in the case where one of the both end faces of the gear cutting portion is a taper surface and the other is different and the other end of the pinion blank is pressed and fixed while the waste washer is in surface contact with the both end faces. It is. In the fourth embodiment of the present invention, a plurality of pinion blanks whose both end surfaces of the gear cutting portion are tapered surfaces are connected, and among the connected pinion blanks, the end surface of the pinion blank to be gear-cut last, and each pinion It is gear cutting process explanatory drawing in the state which provided the waste washer surface-contacted between the blanks, and the cutting end surface of the pinion blank to which gear cutting is carried out first among the connected pinion blanks, and pressed. It is explanatory drawing of 1st Example in the pinion gear cutting method of this invention. It is explanatory drawing of 2nd Example in the gear cutting processing method of the pinion of this invention. It is explanatory drawing of 3rd Example in the pinion gear cutting method of this invention. It is explanatory drawing of 4th Example in the gear cutting processing method of the pinion of this invention. It is explanatory drawing of 5th Example in the gear cutting method of the pinion of this invention. It is gear cutting process explanatory drawing to the pinion blank in background art.

Explanation of symbols

10, 300, 600, 700, 800, 900 Pinion blank 10n, 300n, 600n, 700n, 800n, 900n End face on the side from which the cutter comes off (missing end face)
10k, 300k, 600k, 700k, 800k, 900k End face on the side where the cutter cuts (cut end face)
11, 311, 611, 711R, 711L Tapered surface 102, 302, 303, 402, 602, 702, 703, 802, 902 Discarded washer

Claims (7)

  In a gear-cutting method in which a pinion blank is formed by cutting both ends of a gear-cut portion into a tapered pinion blank using a gear cutting machine, a washer is brought into surface contact with the tapered surface of the pinion blank. A pinion gear cutting method, wherein the pinion blank and the discarded washer are pressed and fixed.   In the gear cutting processing method in which both end surfaces of the gear cutting portion are cut into a pinion blank having a tapered surface using a gear cutting machine to form a pinion, the gear cutting portion of the pinion blank and the end surface on the side from which the cutter comes off, A pinion gear-cutting method, wherein the pinion blank is brought into surface contact and the pinion blank and the waste washer are pressed and fixed.   In a gear-cutting method for forming a pinion by cutting a pinion blank having a tapered surface on at least one of the different shapes of both end surfaces of a gear cutting portion using a gear cutting machine, both end portions of the pinion blank to be cut A pinion gear-cutting method comprising: bringing a waste washer matched to the shape of both ends into surface contact and cutting the pinion in a state where the pinion blank and the waste washer are pressed and fixed.   In the gear-cutting method of forming a pinion by cutting a plurality of pinion blanks in which both end surfaces of the gear cutting portion are tapered using a gear cutting machine, the last of the pinion blanks connected in series. The end surface on the side where the cutter of the pinion blank to be geared out, the end surface between the pinion blanks, and the end surface on the side into which the cutter of the pinion blank to be geared first cut among the plurality of pinion blanks, respectively A pinion gear-cutting method, characterized in that gear-cutting is performed in a state in which a plurality of pinion blanks and a plurality of pinned washers are pressed and fixed in a surface contact with a washer.   5. The pinion gear cutting method according to claim 1, wherein a diameter equal to or greater than a diameter of a tip circle of the pinion blank is used for the discard washer.   6. The pinion gear cutting method according to claim 1, wherein a material that is the same as the material of the pinion blank or has good machinability is used for the discard washer.   A pinion processed using the pinion gear cutting method according to any one of claims 1 to 6.

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