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Gear manufacturing method and manufacturing device

A technology of manufacturing device and manufacturing method, which is applied in the field of gear manufacturing and manufacturing device, and can solve problems such as density reduction and internal cracking of teeth.

Active Publication Date: 2021-01-22
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if Figure 12 As shown in , the density at C near the center of the tooth height inside the tooth portion decreases, and cracks may occur inside the tooth portion

Method used

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  • Gear manufacturing method and manufacturing device
  • Gear manufacturing method and manufacturing device
  • Gear manufacturing method and manufacturing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] First, the structure of the manufacturing apparatus of the gear of this embodiment is briefly demonstrated. figure 1 It is a plan view which schematically shows the manufacturing apparatus of the gear of this embodiment. figure 2 is along figure 1 A partial cross-sectional view cut along the line II-II. image 3 It is a block diagram showing the control system of the manufacturing apparatus of the gear of this embodiment. In addition, in the following description, for clarity of description, a three-dimensional (XYZ) coordinate system is used for description. In addition, in the following description, it demonstrates on the premise that the rolling gear blank is arrange|positioned in the manufacturing apparatus of a gear.

[0043] Such as figure 1 as well as figure 2 As shown, the gear manufacturing device (hereinafter, sometimes simply referred to as the manufacturing device) 1 of this embodiment is preferably used when manufacturing a gear by rolling the too...

Embodiment approach 2

[0084] The protrusions 13g and 14g in Embodiment 1 are rectangular when viewed from the Z-axis direction, but they may be as follows: Figure 9 As shown, it has a substantially circular shape when viewed from the Z-axis direction. However, the protruding portions 13g and 14g should be able to cover at least the area A in the tooth portion 2a of the gear blank 2 at a predetermined depth including at least the region A where the density inside the tooth portion 2a is reduced. The shape of area B to be extruded is sufficient. here, in Figure 9 In , one protrusion is shown as an example.

Embodiment approach 3

[0086] In Embodiment 1, in the tooth portion 2a of the gear blank 2, the area B including at least the area A in which the density inside the tooth portion 2a is reduced when the rolling process is performed is pressed, but the present invention is not limited to here. Figure 10 It is a plan view which schematically shows the manufacturing apparatus of the gear of this embodiment. Figure 11 is along Figure 10 Partial cross-sectional view of XI-XI line section. In addition, since the manufacturing method and manufacturing apparatus of the gear of this embodiment are substantially the same as the manufacturing method and manufacturing apparatus of the gear of Embodiment 1, repeated description is abbreviate|omitted, and the same code|symbol is used for the same member.

[0087] The manufacturing apparatus 21 of this embodiment is provided with the press plates 22 and 23 instead of the punch part 13a and the punch part 14a of Embodiment 1. As shown in FIG. That is, the manu...

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PUM

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Abstract

The present disclosure realizes a method of manufacturing a gear capable of suppressing cracks occurring inside the tooth portion when rolling is applied to the tooth portion of the blank gear. The gear manufacturing method according to one aspect of the present disclosure is a method of manufacturing a gear (15) by rolling the tooth portion (2a) of a sintered gear blank (2). 2) When the tooth part (2a) is subjected to rolling processing, the gear blank (2) is pressed toward the rotation center of the gear blank (2) by the rolling machine (4), and the gear blank (2) is pressed toward the gear blank (2) by the extrusion machine (5). The center of the thickness of the tooth portion (2a) of the blank (2) presses at least the area (A) where the density of the tooth portion (2a) of the gear blank (2) decreases during rolling.

Description

technical field [0001] The present disclosure relates to a gear manufacturing method and a manufacturing device, for example, to a method and a device for manufacturing a gear by rolling a tooth portion of a sintered gear blank. Background technique [0002] Typically, sintered gear blanks are rolled in order to densify the tooth flank density. For example, for the gear manufacturing method disclosed in Japanese Patent Application Laid-Open No. 2015-203128, in order to achieve densification of the tooth surface density and improve the roundness of the tooth portion through rolling processing, the rolling allowance ratio of the bottom of the tooth is Rolling is performed on the tooth portion of the gear blank so that the rolling allowance at the tooth tip is large. [0003] The present applicant discovered the following problems. In the case of carrying out rolling processing on the tooth part of the gear blank, relative to the tooth surface such as Figure 12 As shown, a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21H5/00B21C23/14
CPCB21H5/00B21C23/14B21H5/022B21H5/027B21K1/30B22F5/08B22F2998/10F16H55/16B23F19/00
Inventor 平山正宣片桐鹰英堤雄吾广濑学胜川康宏
Owner TOYOTA JIDOSHA KK
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