Isothermal forging method of straight bevel gear

A straight bevel gear and isothermal forging technology, applied in the field of warm forging, can solve the problems of gear bending strength, contact fatigue strength reduction, incomplete filling of tooth shape, difficulty in adjusting machine tools, etc. The effect of small quantity and lower production cost

Inactive Publication Date: 2016-09-07
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional processing method of straight bevel gears is cutting, mainly tooth planing (suitable for small batches, multi-variety straight bevel gear processing and easy to convert products) and milling (higher efficiency but difficult to adjust machine tools), but these traditional There are many shortcomings in the processing method: the mechanical properties such as the bending strength and contact fatigue strength of the gear are reduced; the utilization rate of the material is relatively low; the efficiency of mass production of the gear is low, etc.
Although the gear precision forging technology has been relatively mature after more than 60 years of development, there are still problems such as insufficient tooth filling, low gear precision, and high forming force.

Method used

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  • Isothermal forging method of straight bevel gear

Examples

Experimental program
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Effect test

Embodiment 1

[0036] like figure 1 Shown, the method for the isothermal forging of straight bevel gear of the present invention comprises the following steps:

[0037] The first step: the calculation and blanking of the blank. According to the bevel gear forging diagram, combined with the theory of constant volume, the blank size is calculated. The shearing machine is used to blank the bar steel, and then the oxide skin on the surface of the bar is taken out, the outer surface is turned and chamfered to obtain the required shape and size of the blank.

[0038] The second step: mold heating and blank heating and lubrication. The heating device of the mold adopts a resistance wire ceramic heating ring, such as image 3 Shown is a hollow ceramic cylinder 7 with resistance wires 6 wound in the two walls. The heating method of the billet is induction heating by medium frequency induction furnace. First preheat the billet to 80-120°C, spray commercial water-based graphite lubricant, and then...

Embodiment 2

[0046]This embodiment is the same as Embodiment 1, the difference is that in the third step of the isothermal forging forming process, the toothed die 1 goes down at a speed of 0.08mm / s to upset the blank 4, when the back cone die 2 and the toothed After the mold 1 is closed, the upper punch 3 and the lower punch 5 relatively extrude the billet at the same speed of 0.08mm / s to fill the mold cavity and form a punching skin with a certain thickness. After the forming is completed, the mold is demoulded .

Embodiment 3

[0048] This embodiment is the same as Embodiment 1, except that in the third step of the isothermal forging forming process, the toothed die 1 descends at a speed of 0.03mm / s to upset the blank 4, when the back cone die 2 and the toothed After the mold 1 is closed, the upper punch 3 and the lower punch 5 relatively extrude the billet at the same speed of 0.03mm / s to fill the mold cavity and form a punching skin with a certain thickness. After the forming is completed, the mold is demoulded .

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Abstract

The invention discloses an isothermal forging method of a straight bevel gear. A blank and a mold are heated to roughly consistent temperatures respectively, then the blank is placed into the mold and is subjected to forging molding in the mold at the relatively low strain rate, and the straight bevel gear is obtained through aftertreatment, wherein the relatively low strain rate is lower than 0.1 mm/s, and the mold adopts a closed mold forging structure. According to the method, firstly, the blank and the mold are heated to the equal temperature or basically equal temperatures, so that the chilling effect produced when the temperature of the mold is lower than that of the blank is avoided, and the plastic flow of the blank is improved; secondly, the mold adopts the closed mold forging structure, the blank bears three-dimensional compressive stress in the forging process, and thus molding of the blank is facilitated; thirdly, the strain rate is lower than 0.1 mm/s, accordingly, the deformation amount of the blank in unit time is small, deformation is sufficient, and molding of the blank is more facilitated.

Description

technical field [0001] The invention belongs to the field of metal plastic forming, in particular to a method for isothermal forging of straight bevel gears. Background technique [0002] Bevel gear is the abbreviation of bevel gear. It is used to realize the transmission between two intersecting shafts. The intersection angle S of the two shafts is called the shaft angle. Its value can be determined according to the transmission needs, and generally 90° is used. The teeth of the bevel gear are arranged on a truncated cone, and the teeth gradually shrink from the large end to the small end of the gear. Due to this feature, the relevant "cylinders" corresponding to cylindrical gears become "cylinders" in bevel gears, such as indexing cones, pitch cones, base cones, and tooth tip cones. The teeth of bevel gears are in the form of straight teeth, helical teeth and curved teeth. [0003] The traditional processing method of straight bevel gears is cutting, mainly tooth planing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/30B21J5/02B21J1/06
CPCB21J1/06B21J5/025B21K1/30
Inventor 赵新海刘丹丹吴向红刘广荣徐洪强王新云宋立彬郑超栾贻国
Owner SHANDONG UNIV
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