JPS62179842A - Finish thread rolling method for gear - Google Patents

Abstract

PURPOSE:To improve the working accuracy and the efficiency by fixing and engaging a guide gear having a true involute tooth form and a gear to be guided having a corrected tooth form, to a tool shaft and a work shaft, subsequently, executing the working by bringing both the shafts close to each other. CONSTITUTION:A tool shaft 5 and a work shaft 6 are placed in parallel, and also, a thread rolling tool 1 and a guide gear 3 having an uncorrected true involute gear are fixed at a prescribed interval W to the tool shaft 5. A gear to be guided 4 which is engaged to the gear 3, and a gear to be thread-rolled 2 is fixed at the same interval W to the work shaft 6. In this case, the gear to be guided 4 has a corrected tooth form which has formed a huge part 7 in its tooth top, engaged to the guide gear 3 and rotated. Subsequently, the shafts 5, 6 are brought close to each other relatively, and the working is executed until a backlash between the gears 3, 4 becomes zero. Since the working is executed based on the corrected tooth form, the working accuracy and efficiency are improved.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention uses a gear rolling tool to improve the surface roughness and tooth profile of a gear machined with a gear cutting tool such as a hob or pinion cutter. (Prior art) A gear machined using a gear cutting tool is shaped into a predetermined tooth profile, meshed with a gear-shaped rolling tool, rotated, and then rolled. The tooth surface of a rolling tool on the tooth surface of a gear? Finish rolling is generally performed by pressing.

In this case, two rolling tools are usually used.

Furthermore, although it is a grinding machine,
In the publication, a rolling tool and a guide gear are fixed to a tool shaft, a rolled gear and a guided gear are fixed to a workpiece shaft, and the tool shaft and workpiece shaft are arranged with a predetermined intersecting axis to form a rolling tool. A method of meshing a rolled gear, a guide gear, and a guided gear and machining each tooth surface on one side of the gear to be machined is disclosed.

(Problems to be Solved by the Invention) In conventional machining using two rolling tools, the gear to be machined is supported at both ends of the work shaft, but due to the rotation of the gear-shaped tool, In order to rotate the gear to be machined, machining load fluctuations occur on the gear to be machined, resulting in a tooth profile error as shown in FIG. 6(a).

In addition, when machining is performed by fixing the guide gear to the tool axis and the guided gear to the workpiece axis, finishing machining is performed on one side of the tooth surface of the to-be-machined gear, so the machining time has to be shifted. It was much needed and cumbersome for shift work.

Moreover, although these processes were possible with helical gears, they were not practical with spur gears due to large tooth profile errors.

(Function) The shafts (6) are arranged completely in parallel, and the rolling tool, the gear to be rolled, and the guide with an unmodified true involute tooth profile are rotated and brought closer to each other gradually over the distance between the shafts. Immediately after starting rolling,
There is a back rack between the guide gear (3) and the guided gear (4) equal to the rolling allowance, but as the rolling progresses, the clearance gradually decreases and the back rack becomes zero at the end of rolling. At the end of rolling, a desired tooth profile is finish-rolled on the gear to be rolled, imitating the tooth profile of the guided gear (4) which has undergone tooth profile modification.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. The guide gear (3) having a true involute tooth profile is
) at a predetermined interval (W) k. The other tool shaft (6) also has a rolling tool (1) and a guide gear (3) fixed to it. ) is fixed.The guided gear (4), which meshes with the rolled gear, is fixed.The guided gear has a modified tooth profile adapted to the desired tooth profile required for the rolled gear, as shown in FIG. The tooth profile of the guide gear (3) is a true involute tooth profile, whereas the 411ft 4F gear (4) has an enlarged part (7) completely formed at the tip of the tooth.The work shaft (6) is located entirely in the center, and the tool shaft (5) is located on both sides. , (5)
are arranged parallel to each other, and the rolling tool (11) and the gear to be rolled (2
)and? At the same time, the guide gear (3) and the guided gear (4) are also engaged.

Next, one of the tool shafts (5), (5), and the work shaft (6) is fixed, and the table of the processing machine (not shown) is rotated by appropriate means such as hydraulic pressure, rack and pinion, or ball screw. Finish rolling is performed by moving other axes toward the axis to shorten the distance between the axes. That is, as shown in Fig. 4, a rolling tool (1), a gear to be rolled (2), a guide gear (3)
) and the guided gear (4), and there is a clearance between the rotating guide gear and the rolling allowance (△T), so there is a back rack between the eight guided gear (3) and the guided gear (4). be. As the rolling progresses and the distance between the axes becomes closer, the guide gear and the guided gear mesh with zero backlash as shown in Fig. 5, and the rolled gear (2) follows the modified tooth profile of the guided gear (4). ) is finish rolled.

Note that the modified tooth profile of the guided gear can be formed into various tooth profiles depending on the desired conditions of the gear.

(Effect) In the present invention, as described above, the guide gear with a true involute tooth profile and the guided gear with a modified tooth profile are fixed to the tool shaft and work shaft, and both gears are fully meshed.
By using the corrected tooth profile of the guide gear (4) shown enlarged in (B), a desired tooth profile without any tooth profile errors as shown in FIG.

Additionally, there is no need for shift work at all, allowing for efficient machining. Furthermore, error-free machining of spur gears is now possible.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the device used in this invention, Figure 2 is the tooth profile of the guide gear, Figure 3 is an example of the tooth profile of the guided gear, and Figure 4 is the meshing state at the start of rolling. A schematic diagram, FIG. 5 is a schematic diagram of the meshing state at the end of rolling, and FIG. 6 is a tooth profile measurement diagram, in which (a) is a conventional product, (b) is a guide gear, and (c) is a gear according to the present invention. The resulting tooth profiles are shown. 1... Rolling tool 2... Rolled piece 3...
Guide gear 4...Guided gear agent Patent attorney
Jun Kawauchi 2 paper 1 figure '$2 figure 'IJ3 figure? ! ,4Figure 1A5Figure

Claims (4)

[Claims] (1) A rolling tool and a guide gear with a true involute tooth profile and the same rolling diameter as the rolling tool are fixed to the tool shaft, and a rolled gear and a guided gear with a modified tooth profile are fixed to the work shaft. Next, the tool axis and the workpiece axis are arranged in parallel positions, and the rolling tool and the rolled gear are meshed with the guide gear and the guided gear, respectively, and the workpiece axis and the tool axis are aligned while giving rotation to the tool axis. A method for finish rolling gears, which is characterized by making gears close to each other. (2) A method for finish rolling gears according to claim 1, which uses a pair of tool shafts. (3) A method for finish rolling a gear according to claim 1, which uses a guided gear having a modified tooth profile with a bulge formed therein. (4) A method for finish rolling a gear according to claim 1, which uses a guide gear having the same modified tooth profile as the rolling tool.