WO2016058555A1 - Differential bevel gear finishing bed die - Google Patents
Differential bevel gear finishing bed die Download PDFInfo
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- WO2016058555A1 WO2016058555A1 PCT/CN2015/092087 CN2015092087W WO2016058555A1 WO 2016058555 A1 WO2016058555 A1 WO 2016058555A1 CN 2015092087 W CN2015092087 W CN 2015092087W WO 2016058555 A1 WO2016058555 A1 WO 2016058555A1
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- tooth
- bevel gear
- convex step
- large end
- die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
Definitions
- the invention belongs to the technical field of metal forging die structure design, in particular, the invention relates to a gear forging die structure design, in particular to a differential bevel gear finishing without a flanging of a tooth surface after precision turning forming of a tooth blank. Counter mold.
- the differential bevel gear in the car differential is a bevel gear with a spherical surface on the back.
- This spherically positioned and meshed transmission component has high requirements for matching quality.
- Today, the industry generally uses the die forging process to manufacture differential bevel gears.
- the large end face finishing is performed after the die forging finishing.
- the front outer contour of the differential bevel gear is a tooth surface, and the tooth surface is composed of equally spaced teeth and slots.
- the fine tooth surface is intermittently cut. Since the intersection of the tooth and the tooth groove is an acute angle, the cutter cutting tooth When the surface is in the surface of the tooth, the metal is easily rolled into the tooth groove.
- the burrs in the cogging are easy to cause the gear assembly to be difficult or even stuck, so the product must be added to the flanging process before leaving the factory.
- One more processing step in the production process necessarily increases manufacturing costs and reduces work efficiency.
- the invention mainly aims at the deficiencies of the prior art, and proposes a differential bevel gear finishing bottom mold which is used as a pre-chamfering of the tooth portion and the cogging at the time of finishing forming, and the pre-chamfering structure of the mold is simple and easy to manufacture. High work efficiency and stable processing quality.
- the present invention achieves the technical object by the following technical solutions.
- the differential bevel gear is finished with a bottom mold having an open bevel tooth cavity.
- the improvement is that: the large end of the tooth portion of the tapered tooth cavity is located at the upper portion, the small end is located at the bottom portion, and the tooth profile edge of the large end surface of the toothed portion is provided with a convex step (A), and the convex step (A)
- the cross section is an acute triangle.
- the invention has the following positive effects:
- the convex step provided on the edge of the tooth profile of the large tooth surface of the upper portion of the bevel tooth cavity is simple and easy to manufacture;
- a convex step is arranged on the tooth profile of the large end face of the tooth portion, so that the contour of the large-faced differential bevel gear of the finishing forming is chamfered, and the oblique chamfer increases the cutting direction between the cutting tool and the large end face during turning. Angle, which reduces the impact of intermittent turning and avoids flanging;
- the tooth profile of the large end face has no flanging, which saves the punching process, thereby improving the work efficiency and reducing the bump between the workpieces during the process turn, which is beneficial to improve the processing quality.
- Figure 1 is a schematic view of the structure of the present invention.
- Figure 2 is an axial cross-sectional view of Figure 1 showing the structure of the teeth.
- FIG. 3 is an enlarged schematic cross-sectional view of the tooth portion K-K of FIG. 2, showing the outer convex step structure.
- Fig. 4 is a partially enlarged schematic view showing the workpiece which is finished by the structure shown in Fig. 1, showing the chamfering of the large end tooth surface.
- Fig. 5 is a prior art finished workpiece having a large-toothed tooth portion of the tooth portion of the workpiece.
- the differential bevel gear finishing die shown in Fig. 1 is provided with an open bevel tooth cavity, the inner wall of the cavity being composed of equally spaced teeth and slots.
- the present invention is provided with a convex step A in the upper portion of the tapered tooth cavity, that is, the tooth profile edge of the large end face of the tooth portion, in order to prevent the workpiece from being flanging when the large end face is finished and finished after the finishing.
- the k-k cross section of the convex step A is an acute triangle as shown in FIG. 3, and the acute angle is toward the bottom of the tooth groove.
- the workpiece processed in this embodiment is a differential bevel gear matched with a car differential.
- the size of the gear is relatively small, so the preset convex step A is not large in size, and the acute angle ⁇ is 15°, and the acute angle is opposite.
- the invention realizes chamfering on the tooth profile edge of the large end surface of the bevel gear tooth portion by presetting the convex step A in the cavity, and the finished product is as shown in FIG. 4 .
- the inclined chamfer increases the angle between the tool and the cutting direction when turning the large end face of the tooth, thereby reducing the impact force of intermittent turning and avoiding the phenomenon of flanging.
- the large-end surface finishing of the workpiece tooth surface is not subjected to the flanging, thereby eliminating the flushing and burring process, greatly improving the production efficiency, and also reducing the bump between the workpieces during the process turnover. Conducive to improving the quality of processing.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Disclosed is a differential bevel gear finishing bed die. The die is provided with a bevel gear-shaped die cavity of an open shape, an inner wall of the die cavity is constituted by tooth parts and tooth grooves arranged at equal intervals. A convex step (A) is provided at a tooth profile edge of a large end face of the tooth part of the bevel gear-shaped die cavity, and the cross section of the convex step (A) is an acute-angled triangle. In order to facilitate de-moulding the workpiece, a bevel edge of the acute-angled triangle of the convex step leaves a die ejection inclination of 0.5°-3°. By pre-setting a convex step in a die cavity, pre-setting a chamfer on a workpiece large end tooth profile edge when the finishing shaping is performed, obliquely providing a chamfer to increase the included angle of a cutter cutting direction and the large end face when the turning is performed, so as to reduce the impact force of interrupted turning, thereby preventing the the generation of flanges occurring. After the workpiece is modified and finishing has been performed, the large end face has no flanges, a punching procedure is omitted, the production efficiency is greatly improved, and collisions between workpieces are reduced at the same time, thereby aiding in an improvement in processing quality, which is especially suitable for mass production of a complete production line.
Description
本发明属于金属锻造模具结构设计技术领域，具体地讲，本发明涉及一种齿轮锻模结构设计，特别是精锻成形的齿坯经车削加工后齿面无翻边的差速锥齿轮精整底模。The invention belongs to the technical field of metal forging die structure design, in particular, the invention relates to a gear forging die structure design, in particular to a differential bevel gear finishing without a flanging of a tooth surface after precision turning forming of a tooth blank. Counter mold.
汽车差速器中的差速锥齿轮是一种背面为球面的锥齿轮，此种以球面定位且靠啮合传动的部件对配套质量要求很高。当今，本行业普遍采用模压锻造成形工艺制造差速锥齿轮。为了进一步提高差速锥齿轮的啮合质量，在模锻精整成形之后再实施大端面修形精加工。差速锥齿轮的正面外轮廓为齿面，齿面由等间距排列的齿和齿槽组成，精车齿面时呈断续切削，由于齿和齿槽的交汇处为锐角，车刀切削齿面时齿部边缘金属易向齿槽内翻卷。齿槽内有翻卷的毛刺容易造成齿轮装配困难甚至卡死，故产品出厂前必须增加一道齿面去翻边工序。生产过程中多一道加工工序必然增加制造成本，降低工效。The differential bevel gear in the car differential is a bevel gear with a spherical surface on the back. This spherically positioned and meshed transmission component has high requirements for matching quality. Today, the industry generally uses the die forging process to manufacture differential bevel gears. In order to further improve the meshing quality of the differential bevel gear, the large end face finishing is performed after the die forging finishing. The front outer contour of the differential bevel gear is a tooth surface, and the tooth surface is composed of equally spaced teeth and slots. The fine tooth surface is intermittently cut. Since the intersection of the tooth and the tooth groove is an acute angle, the cutter cutting tooth When the surface is in the surface of the tooth, the metal is easily rolled into the tooth groove. The burrs in the cogging are easy to cause the gear assembly to be difficult or even stuck, so the product must be added to the flanging process before leaving the factory. One more processing step in the production process necessarily increases manufacturing costs and reduces work efficiency.
发明内容Summary of the invention
本发明主要针对现有技术的不足，提出一种在精整成形时一并作齿部及齿槽预制倒角的差速锥齿轮精整底模，该模预倒角结构简单，制作容易、工效高、加工质量稳定。The invention mainly aims at the deficiencies of the prior art, and proposes a differential bevel gear finishing bottom mold which is used as a pre-chamfering of the tooth portion and the cogging at the time of finishing forming, and the pre-chamfering structure of the mold is simple and easy to manufacture. High work efficiency and stable processing quality.
本发明通过下述技术方案实现技术目标。The present invention achieves the technical object by the following technical solutions.
差速锥齿轮精整底模,该模设有敞口状的锥齿形模腔。其改进之处在于：所述锥齿形模腔的齿部大端位于上部，小端位于底部，顺齿部大端面的齿廓边沿设有外凸台阶(A)，外凸台阶(A)的横截面为锐角三角形。The differential bevel gear is finished with a bottom mold having an open bevel tooth cavity. The improvement is that: the large end of the tooth portion of the tapered tooth cavity is located at the upper portion, the small end is located at the bottom portion, and the tooth profile edge of the large end surface of the toothed portion is provided with a convex step (A), and the convex step (A) The cross section is an acute triangle.
上述结构中，外凸台阶(A)横截面上的锐角β＝10°～15°，锐角朝向齿槽底部，锐角的对边宽度B＝0.5～0.8mm，锐角三角形的斜边长L＝2～3mm；外凸台阶(A)的锐角三角形边留有α＝0.5°～3°的起模斜度。In the above structure, the acute angle β=10°～15° on the cross section of the convex step (A), the acute angle is toward the bottom of the tooth groove, the width of the opposite side of the acute angle is B=0.5-0.8 mm, and the length of the oblique side of the acute triangle is L=2. ~3mm; the sharp-angled triangle side of the convex step (A) leaves a draft angle of α = 0.5° to 3°.
本发明与现有技术相比，具有以下积极效果：Compared with the prior art, the invention has the following positive effects:
1、在锥齿形模腔上部顺齿部大端面齿廓边沿设置的外凸台阶结构简单、制作容易；1. The convex step provided on the edge of the tooth profile of the large tooth surface of the upper portion of the bevel tooth cavity is simple and easy to manufacture;
2、在齿部大端面的齿廓上设置外凸台阶，使精整成形的差速锥齿轮大端面齿廓预留倒角，斜置倒角增加车削时刀具切削方向与大端面之间的夹角，从而减少断续车削的冲击力，避免发生翻边现象；2. A convex step is arranged on the tooth profile of the large end face of the tooth portion, so that the contour of the large-faced differential bevel gear of the finishing forming is chamfered, and the oblique chamfer increases the cutting direction between the cutting tool and the large end face during turning. Angle, which reduces the impact of intermittent turning and avoids flanging;
3、工件车削后大端面齿廓无翻边，省掉冲裁工序，从而提高工效，同时也减少工序间周转时工件之间的磕碰，有利于提高加工质量。
3. After the workpiece is turned, the tooth profile of the large end face has no flanging, which saves the punching process, thereby improving the work efficiency and reducing the bump between the workpieces during the process turn, which is beneficial to improve the processing quality.
图1是本发明结构示意图。Figure 1 is a schematic view of the structure of the present invention.
图2是图1的轴向剖面图，展示齿部结构。Figure 2 is an axial cross-sectional view of Figure 1 showing the structure of the teeth.
图3是图2齿部K-K剖面结构放大示意图，展示外凸台阶结构。3 is an enlarged schematic cross-sectional view of the tooth portion K-K of FIG. 2, showing the outer convex step structure.
图4是用图1所示结构精整成形的工件局部放大示意图，展示大端齿面预留倒角。Fig. 4 is a partially enlarged schematic view showing the workpiece which is finished by the structure shown in Fig. 1, showing the chamfering of the large end tooth surface.
图5是现有技术精整成形的工件，该工件齿部大端面齿部为直角边。Fig. 5 is a prior art finished workpiece having a large-toothed tooth portion of the tooth portion of the workpiece.
下面根据附图并结合实施例，对本发明作进一步说明。The invention will now be further described with reference to the drawings in conjunction with the embodiments.
图1所示的的差速锥齿轮精整底模，该模设有敞口状的锥齿形模腔，模腔内壁由等间距排列的齿部和齿槽组成。本发明为了避免工件在精整成形后实施大端面修形精加工时产生翻边，在锥齿形模腔的上部，即齿部大端面的齿廓边沿设有外凸台阶A。所述外凸台阶A的k-k横截面如图3所示为锐角三角形，锐角朝向齿槽底部。本实施例加工的工件是轿车差速器配套的差速锥齿轮，该类齿轮尺寸相对较小，故预置的外凸台阶A尺寸也不大，其中的锐角β为15°，锐角的对边宽度B＝0.5mm，锐角三角形的斜边长L＝2mm。为了便于工件脱模，外凸台阶A的锐角三角形斜边留有α＝1.5°的起模斜度。本发明通过在模腔中预置外凸台阶A，实现精整成形时在锥齿轮齿部大端面的齿廓边沿作倒角成形，其成品如图4所示。斜置的倒角增加车削齿部大端面时刀具与切削方向的夹角，从而减小断续车削的冲击力，避免发生翻边现象。通过本发明的实施，实现工件齿部大端面修形精加工不产生翻边，由此省掉冲翻边工序，大大提高了生产工效益，同时也减少工序周转时工件之间的磕碰，有利于提高加工质量。
The differential bevel gear finishing die shown in Fig. 1 is provided with an open bevel tooth cavity, the inner wall of the cavity being composed of equally spaced teeth and slots. The present invention is provided with a convex step A in the upper portion of the tapered tooth cavity, that is, the tooth profile edge of the large end face of the tooth portion, in order to prevent the workpiece from being flanging when the large end face is finished and finished after the finishing. The k-k cross section of the convex step A is an acute triangle as shown in FIG. 3, and the acute angle is toward the bottom of the tooth groove. The workpiece processed in this embodiment is a differential bevel gear matched with a car differential. The size of the gear is relatively small, so the preset convex step A is not large in size, and the acute angle β is 15°, and the acute angle is opposite. The side width B = 0.5 mm, and the oblique side length of the acute triangle is L = 2 mm. In order to facilitate the demolding of the workpiece, the oblique angle of the acute triangular corner of the convex step A is left with a draft angle of α=1.5°. The invention realizes chamfering on the tooth profile edge of the large end surface of the bevel gear tooth portion by presetting the convex step A in the cavity, and the finished product is as shown in FIG. 4 . The inclined chamfer increases the angle between the tool and the cutting direction when turning the large end face of the tooth, thereby reducing the impact force of intermittent turning and avoiding the phenomenon of flanging. Through the implementation of the invention, the large-end surface finishing of the workpiece tooth surface is not subjected to the flanging, thereby eliminating the flushing and burring process, greatly improving the production efficiency, and also reducing the bump between the workpieces during the process turnover. Conducive to improving the quality of processing.
Claims (3)
- 一种差速锥齿轮精整底模,该模设有敞口状的锥齿形模腔；其特征在于：所述锥齿形模腔的齿部大端位于上部，小端位于底部，顺齿部大端面的齿廓边沿设有外凸台阶(A)，外凸台阶(A)的横截面为锐角三角形。A differential bevel gear finishing die, the die is provided with an open bevel tooth cavity; wherein the toothed portion of the tapered tooth cavity is located at the upper end and the small end is at the bottom. The tooth profile edge of the large end face of the tooth portion is provided with a convex step (A), and the cross section of the convex step (A) is an acute angle triangle.
- 根据权利要求1所述的差速锥齿轮精整底模，其特征在于：所述外凸台阶(A)横截面上的锐角β＝10°～15°，锐角朝向齿槽底部，锐角的对边宽度B＝0.5～0.8mm，锐角三角形的斜边长L＝2～3mm。The differential bevel gear finishing bottom mold according to claim 1, wherein an acute angle β=10° to 15° on the cross section of the convex step (A), the acute angle is toward the bottom of the tooth groove, and the pair of acute angles The side width B = 0.5 to 0.8 mm, and the oblique side length of the acute triangle is L = 2 to 3 mm.
- 根据权利要求1所述的差速锥齿轮精整底模，其特征在于：所述外凸台阶(A)的锐角三角形边留有α＝0.5°～3°的起模斜度。 The differential bevel gear finishing die according to claim 1, characterized in that the sharp-angled triangle side of the convex step (A) leaves a draft angle of α = 0.5° to 3°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410551912.8A CN104308062A (en) | 2014-10-17 | 2014-10-17 | Differential bevel gear finishing bed die |
| CN201410551912.8 | 2014-10-17 |
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| WO2016058555A1 true WO2016058555A1 (en) | 2016-04-21 |
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| PCT/CN2015/092087 WO2016058555A1 (en) | 2014-10-17 | 2015-10-16 | Differential bevel gear finishing bed die |
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| CN (1) | CN104308062A (en) |
| WO (1) | WO2016058555A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109550802A (en) * | 2018-12-14 | 2019-04-02 | 江西福格新能源传动技术有限公司 | A kind of differential gear axial direction shunting cold-extrusion shaping apparatus and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104308062A (en) * | 2014-10-17 | 2015-01-28 | 江苏太平洋精锻科技股份有限公司 | Differential bevel gear finishing bed die |
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| CN109550802A (en) * | 2018-12-14 | 2019-04-02 | 江西福格新能源传动技术有限公司 | A kind of differential gear axial direction shunting cold-extrusion shaping apparatus and method |
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| CN104308062A (en) | 2015-01-28 |
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