JP2008110461A - Threaded electrodeposition tool and gear machining method - Google Patents

Abstract

[PROBLEMS] To reduce the time and labor required for exchanging tools and work gears, enable efficient gear machining, and simplify phase alignment when finishing a rough-worked work gear. Further improve processing efficiency.
SOLUTION: On the outer periphery of a tool body 1 having a substantially cylindrical shape, screw-like processed parts 8 and 12 that are twisted around an axis O of the tool main body 1 are provided, and the surface of the processed parts 8 and 12 is provided. A rough electrode forming tool 8 in which abrasive layers 7 and 11 having electrodeposited abrasive grains are formed, in which abrasive grains having a large particle size are electrodeposited on the outer periphery of the tool body 1. And the finishing portion 12 on which the abrasive grains having a small particle diameter are electrodeposited are provided coaxially adjacent to each other in the direction of the axis O.
[Selection] Figure 1

Description

  The present invention provides a threaded electrodeposition tool in which a thread-shaped processed portion is provided on the outer periphery of a tool body, and an abrasive layer in which abrasive grains are electrodeposited is formed on the surface of the processed portion, and such a tool The present invention relates to a gear machining method using a threaded electrodeposition tool.

As this type of screw-shaped electrodeposition tool, for example, Patent Document 1 describes an electrodeposition worm-shaped tool as a tool for cutting a tooth profile by applying relative motion to a work gear and a tool by a generating method. In such an electrodeposition tool, it is known that an abrasive layer in which superabrasive grains such as diamond and cBN are electrodeposited is formed on the surface of a base metal having a threaded portion. Then, by engaging the thread-shaped processed portion with the workpiece gear material and rotating the two relative to each other, the workpiece gear material is scraped off by such hard superabrasive grains to create a tooth profile.
JP 2003-266241 A

  By the way, even in the machining of gears with such a screw-shaped electrodeposition tool, rough machining of the work gear is usually performed with a screw-shaped electrodeposition tool for rough machining in which abrasive grains having a large particle size are electrodeposited on the machining portion. Then, the tooth profile of the work gear is finished to a predetermined accuracy using a threaded electrodeposition tool for finishing, in which abrasive grains having a smaller particle diameter are electrodeposited on the machining portion. However, in such a process, a roughing tool is attached to the processing machine and a certain number of work gears are roughed, and then the roughing work gear is finished by replacing it with a finishing tool. Therefore, it takes time and labor to change the tool, as well as the work gear so that the tooth shape of the rough-worked work gear meshes with the thread-like processed part of the tool for finishing work. Therefore, the processing efficiency is further impaired.

  The present invention has been made under such a background, and a threaded electrodeposition tool and a gear machining method capable of efficiently machining a gear by reducing the time and labor required for exchanging a tool and a work gear. Of a threaded electrodeposition tool and gear that can simplify the phase alignment when finishing a rough-worked workpiece gear and further improve the machining efficiency. A further object is to provide a processing method.

  In order to solve the above-described problems and achieve such an object, the screw-shaped electrodeposition tool of the present invention is a screw-shaped electrode that is twisted around the axis of the tool body on the outer periphery of a tool body having a substantially cylindrical outer shape. A threaded electrodeposition tool in which an abrasive grain layer in which abrasive grains are electrodeposited is formed on the surface of the processed part, and the outer periphery of the tool body has a grain size. A rough processed portion on which large abrasive grains are electrodeposited and a finish processed portion on which small abrasive grains are electrodeposited are provided coaxially adjacent to each other in the axial direction. Further, the gear machining method of the present invention uses such a screw-shaped electrodeposition tool to perform rough machining of the workpiece gear by the rough machining portion, and subsequently finish machining of the workpiece gear by the finishing machining portion. It is characterized by performing.

  Therefore, in such a screw-shaped electrodeposition tool, a rough processed portion in which the abrasive grains having a large particle size are electrodeposited on one tool body, and a finish processed portion in which the abrasive particles having a small particle size are electrodeposited, Since the workpiece gear is roughed by the roughing section, the workpiece gear is mounted on the processing machine and moved relative to the tool body in the axial direction, as in the above machining method. Subsequently, the tooth profile can be finished with a predetermined accuracy by the finishing portion. Therefore, the time and labor required for exchanging the tool and the work gear can be reduced, and the gear can be processed efficiently.

  Further, in the threaded electrodeposition tool, the tool main body is divided into a rough machining tool member having the roughing portion and a finishing tool member having the finishing portion by means of phase matching means. Since the screw-shaped roughened portion and the finish-processed portion are arranged along the spiral of the continuous screw by being constructed by assembling by matching the phase of the shaped processed portion, Based on the phase of the rough machining section and workpiece gear tooth profile adjusted during rough machining, the phase of the finish machining section and workpiece gear tooth profile during finishing can be adjusted, and the workpiece gear is continuous. In combination with the processing, the processing efficiency can be further improved. In addition, it is difficult to mask electrodeposited abrasive grains with different grain sizes on a predetermined processing part because it is difficult to mask, but the tool body is finished with a separate rough machining tool member. The screw-shaped electrodeposition tool can also be easily manufactured by assembling and configuring with the processing tool member.

  Here, in order to assemble the roughing tool member and the finishing tool member separated as described above in accordance with the phase of the roughing part and the finishing part by the phase adjusting means, for example, the roughing tool One of the member and the finishing tool member is formed into a substantially cylindrical shape that can be fitted to the other, and the phase adjusting means is configured to connect the roughing tool member and the finishing tool member thus fitted to the axial direction and the circumferential direction. The fixing screws that are positioned and fixed to each other ensure the assembly rigidity of the roughing tool member and the finishing tool member while ensuring the assembly rigidity of the roughing tool member and the finishing tool member with a relatively simple structure. The phase can be adjusted.

  Thus, according to the threaded electrodeposition tool of the present invention and the gear machining method of the present invention using the threaded electrodeposition tool, it is necessary to exchange the tool and the work gear between roughing and finishing. Therefore, it is possible to improve the processing efficiency when processing the gear.

  1 to 7 show an embodiment of the threaded electrodeposition tool of the present invention. In the present embodiment, the tool body 1 is constructed by assembling a roughing tool member 2 shown in FIGS. 2 to 4 and a finishing tool member 3 shown in FIGS. 5 to 7. These roughing tool member 2 and finishing tool member 3 are formed of steel or the like, and as shown in the above figures, the outer shape has a substantially multi-stage cylindrical shape centering on the axis O, and this embodiment In the embodiment, one end side (the left side in FIG. 6) of the finishing tool member 3 is fitted on the inner periphery of the roughing tool member 2, and is integrated by being screwed by a fixing screw 4 as a phase adjusting means. It is done.

  Of these, the roughing tool member 2 has a cylindrical shape or an annular shape flattened in the axial direction, and has an inner diameter from one end side (left side in FIG. 3) from the other end side (right side in FIG. 3). While the outer diameter is slightly reduced, the other end side is smaller than the one end side, and a plurality of (six in this embodiment) mounting holes 5 through which the fixing screw 4 is inserted are provided on the other end side. On one plane orthogonal to O, they are provided at regular intervals in the circumferential direction and in a direction orthogonal to the axis O, respectively. The mounting hole 5 is a stepped hole whose outer diameter side in the radial direction is one step larger than the inner diameter side. Further, both end surfaces of the roughing tool member 2 in the direction of the axis O are planes perpendicular to the axis O, and of these, the inner peripheral edge of the end surface on the one end side has an annular convex portion that protrudes toward the one end side. Is formed.

  One or more strips (in this embodiment, 2 in this embodiment) are twisted at a constant twist angle in a constant direction around the axis O on the outer peripheral portion on one end side where the outer diameter of the roughing tool member 2 is large. The screw-shaped part 6 having a substantially trapezoidal cross section is formed on the surface of the thread-shaped part 6 and a superabrasive grain such as diamond or cBN (in this embodiment, cBN) is coated with a metal plating phase such as Ni. Are coated with an abrasive layer 7 that is uniformly dispersed and electrodeposited, and a roughened portion 8 is formed. The grain size of the abrasive grains electrodeposited on the abrasive grain layer 7 of the roughened portion 8 has an average grain size larger than that of the finish-finished portion described later. In this embodiment, for example, the grain size is about # 80. Has been. The abrasive grain layer 7 is covered only on the surface of the threaded portion 6 (including the valley between the threads) by masking the other portions of the roughing tool member 2 and performing electrodeposition. Yes.

  On the other hand, the finishing tool member 3 has an outer diameter that can be inserted into the inner peripheral portion of the roughing tool member 2 at one end thereof, and the length in the direction of the axis O is substantially equal to the roughing tool member 2. The other end side has a larger diameter than the fitting portion 9, and the outer peripheral portion has a threaded portion 6 and an axis O around the roughing tool member 2. Are formed in the same direction with the same number of threads and the same thread diameter. In the present embodiment, the length of the screw-like portion 10 in the direction of the axis O is also made equal to that of the screw-like portion 6, that is, has the same shape as the screw-like portion 6.

  The surface of the screw-like portion 10 is covered with an abrasive layer 11 in which superabrasive grains such as diamond or cBN (in this embodiment, cBN) are uniformly dispersed in a metal plating phase such as Ni and electrodeposited. In addition, a finishing portion 12 is formed. However, the grain size of the abrasive grains electrodeposited on the abrasive grain layer 11 of the finish machining section 12 is smaller than the average grain diameter of the abrasive grains electrodeposited on the rough machining section 8 as described above. In this case, the granularity is about # 200, for example. The abrasive grain layer 11 is also covered only on the surface including the valleys between the threads of the thread-like part 10, as with the abrasive grain layer 7 of the rough machining tool member 2.

  Further, both side surfaces facing the axis O direction of the other end portion of the finishing tool member 3 on which the finishing portion 12 is formed and an end surface facing the one end side of the fitting portion 9 are perpendicular to the axis O. Is formed. However, an annular convex portion flattened in the direction of the axis O is formed at the inner peripheral edge of the end face of the fitting portion 9, while the inner side surface facing the other end of the other end portion where the finishing portion 12 is formed. On the circumferential side, an annular wall portion 13 is formed with the outer diameter being smaller than that of the fitting portion 9 and the inner diameter being slightly larger than the portion extending from the fitting portion 9 to the finishing portion 12 and centering on the axis O. A key groove 15 is formed in the annular wall portion 14 in the diameter direction with respect to the axis O.

  Further, the outer peripheral surface of the fitting portion 9 is configured such that the finish processing portion 12 side has a slightly smaller diameter than the one end side, and a screw into which the fixing screw 4 as the phase adjusting means is screwed into the small diameter portion. The same number of holes 13 as the mounting holes 5 are formed on the same plane perpendicular to the axis O, at equal intervals in the circumferential direction, and in the direction perpendicular to the axis O, respectively. Here, these screw holes 13 allow the fitting portion 9 on one end side of the finishing tool member 3 to be inserted into the inner periphery of the roughing tool member 2, and the other end surface of the roughing tool member 2 is used as a finishing tool. The position in the direction of the axis O is set so as to coincide with the mounting hole 5 in a state in which the finishing portion 12 of the member 3 is in contact with a side surface facing the one end side of the other end side portion.

  And in this embodiment, after aligning the circumferential position of the mounting hole 5 and the screw hole 13 in this state, the fixing screw 4 is inserted into the mounting hole 5 from the outer peripheral side and screwed into the screw hole 13. Thus, the roughing tool member 2 and the finishing tool member 3 are integrated, and a roughing portion 8 is provided on the outer periphery on one end side, and on the outer periphery on the other end side adjacent to this in the axis O direction. A tool body 1 is configured in which the finishing portion 12 is provided coaxially. Further, at this time, the phase of the screw-like portion 6 in the rough machining portion 8 and the screw-like portion 10 in the finish machining portion 12 are matched by the phase adjusting means, that is, these screw-like portions 6, 10. When one of the two is extended along the twist, it is made continuous with the other.

  In this way, the screw-shaped electrodeposition tool in which the roughing tool member 2 and the finishing tool member 3 are integrated to form the tool main body 1 has a drive shaft of the processing machine on the inner periphery of the finishing tool member 3. The key of the drive shaft is fitted into the key groove 15 of the annular wall portion 14 and is supported by the processing machine so as to be rotatable integrally with the drive shaft around the axis O. Then, the roughing portion 8 and the threaded portions 6 and 10 of the finishing portion 12 are engaged with the work gear supported by the other shaft of the processing machine, and are rotated relative to the work gear. The tooth shape is formed on the work gear by the abrasive grain layers 7 and 11.

  Here, in one embodiment of the gear machining method of the present invention using the screw-shaped electrodeposition tool having the above-described configuration, the tool main body 1 and the work gear are thus supported on the processing machine, and first the rough machining portion is formed. Rough machining of the work gear is performed by 8 At this time, since the abrasive grains electrodeposited on the rough processed portion 8 have a large particle size, the sharpness is sharp, the processing efficiency is high, and the occurrence of welding or the like can be prevented. Then, in the machining method of the present embodiment, the tool body 1 is moved relative to the work gear to the one end side in the axis O direction along with the drive shaft while the work gear is supported by the machine after the rough machining is completed. Subsequent to this roughing, the finishing gear 12 performs finishing processing on the workpiece gear. Thereby, the tooth profile of the gear can be formed with high accuracy and the surface roughness can be improved.

  Therefore, in such a threaded electrodeposition tool of this embodiment and a gear machining method using the same, the work gear is replaced and roughing is performed again every time roughing of one work gear is completed, and thus roughing is performed. After the machining is completed, it is not necessary to exchange the tool, and the work gear can be attached to and detached from the processing machine only once compared to the case where the tool is exchanged to finish each workpiece gear. For this reason, the time and labor required for exchanging these tools and work gears can be greatly reduced, and efficient machining can be performed in a short time even when a large number of gears are machined.

  Further, in the threaded electrodeposition tool of the present embodiment, the tool body 1 includes a roughing tool member 2 having a roughing portion 8 and a finishing tool member 3 having a finishing portion 12 in phase. It is configured to be integrated in a state in which the phases of the screw-like portions 6 and 10 are matched by a fixing screw 4 as an aligning means, and shifts from roughing to finishing for one work gear as described above. When performing roughing, phase matching is performed so that the threaded portion 10 of the finishing portion 12 is meshed with the tooth profile based on the phase of the threaded portion 6 of the roughened portion 8 meshed with the tooth profile of the work gear. Can do. For this reason, even when shifting from rough machining to finishing machining, the time and labor required for phasing can be reduced, and workpiece gears can be machined continuously to further improve machining efficiency. It becomes possible.

  In addition, in order to form a roughing part and a finishing part by electrodepositing abrasive grains having different particle diameters on a tool body that is originally formed integrally, for example, in a part other than one of these roughing part and finishing part After applying masking, the abrasive grains are electrodeposited to form an abrasive layer, and after that, masking is applied to the other parts of the roughing and finishing parts including this abrasive layer to obtain different grain sizes. Abrasive grains must be electrodeposited, and when the latter masking is performed, the previously formed abrasive layer must be masked. May penetrate into the previously electrodeposited abrasive grain surface, making it difficult to manufacture the electrodeposition tool. However, in this embodiment in which separate roughing tool member 2 and finishing tool member 3 are assembled and integrated, each tool member 2 and 3 has a single average grain size abrasive. Since it is sufficient to electrodeposit the grains, such a problem does not occur, and the electrodeposition tool can be easily manufactured.

  Further, in the present embodiment, the roughing tool member 2 and the finishing tool member 3 formed separately as described above are arranged so that the fitting portion 9 of the finishing tool member 3 is located on the inner periphery of the roughing tool member 2. The rough machining tool member 2 and the finishing tool member 3 thus fitted are fixed while being positioned in the direction of the axis O and the circumferential direction by the fixing screw 4 of the phase adjusting means. Thus, the tool body 1 is integrated and the phases of the threaded portions 6 and 10 of the roughing portion 8 and the finishing portion 12 are matched. Therefore, although the structure is relatively simple, the rough machining tool member 2 and the finishing tool member 3 can be fitted to each other to ensure sufficient assembly rigidity as the tool body 1, and as phase adjusting means. By accurately forming the positions of the mounting hole 5 and the screw hole 13 into which the fixing screw 4 is inserted and screwed, the phase alignment between the roughing portion 8 and the finishing portion 12 can be performed reliably. .

It is a partially broken side view which shows one Embodiment of the screw-shaped electrodeposition tool of this invention. It is the figure which looked at the roughing tool member 2 in embodiment shown in FIG. 1 from the axis line O direction one end side. It is a partially broken side view of the roughing tool member 2 in the embodiment shown in FIG. It is the figure which looked at the roughing tool member 2 in embodiment shown in FIG. 1 from the axis line O direction other end side. It is the figure which looked at the finishing tool member 3 in embodiment shown in FIG. 1 from the axis line O direction one end side. It is a partially broken side view of the finishing tool member 3 in the embodiment shown in FIG. It is the figure which looked at the finishing tool member 3 in embodiment shown in FIG. 1 from the axis line O direction other end side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool main body 2 Roughing tool member 3 Finishing tool member 4 Fixing screw (phase alignment means)
DESCRIPTION OF SYMBOLS 5 Mounting hole 6,10 Thread part 7,11 Abrasive layer 8 Roughing part 9 Fitting part 12 Finishing part 13 Screw hole O Axis of tool main body 1

Claims (4)

  On the outer periphery of the tool body whose outer shape is roughly cylindrical, a screw-shaped processing part that twists around the axis of the tool body is provided, and an abrasive layer in which abrasive grains are electrodeposited is formed on the surface of the processing part. A screw-shaped electrodeposition tool formed on the outer periphery of the tool body, a rough machining portion where the abrasive grains having a large particle diameter are electrodeposited, and a finishing process in which the abrasive grains having a small particle diameter are electrodeposited. The screw-shaped electrodeposition tool, wherein the portion is provided coaxially adjacent to the axial direction.   In the tool body, the roughing tool member having the roughing portion and the finishing tool member having the finishing portion are assembled by aligning the phases of the screw-like processing portions with each other by the phase matching means. The screw-shaped electrodeposition tool according to claim 1, wherein   One of the roughing tool member and the finishing tool member is formed into a substantially cylindrical shape that can be fitted to the other, and the phasing means includes the roughing tool member and the finishing tool member thus fitted to each other. The threaded electrodeposition tool according to claim 2, wherein the screw-shaped electrodeposition tool is a fixing screw that is fixed while being positioned in an axial direction and a circumferential direction.   Using the threaded electrodeposition tool according to any one of claims 1 to 3, rough machining of the work gear is performed by the rough machining portion, and then the work gear is finished by the finishing processing portion. A gear machining method characterized by the above.

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