Gear-box planetary gear shaping die

A technology for planetary gears and forming dies, which is applied in the direction of wheels, manufacturing tools, forging/pressing/hammer devices, etc., can solve the problems of difficulty in forging, harsh requirements for blanks, and low die life, so as to achieve complete metal flow lines and reduce Requirements for blanking accuracy and the effect of reducing forming force

Inactive Publication Date: 2008-10-15
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a gearbox planetary gear forming die, which overcomes the problems of the existing forging dies such as large forging force, strict requirements for blanks, low die life and difficulty in forging mold release, so as to meet the forming requirements of the planetary gears of automatic gearboxes for automobiles

Method used

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  • Gear-box planetary gear shaping die
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Embodiment Construction

[0021] Such as figure 1 As shown, the mold of the present invention includes an upper push rod 1, an upper mold cushion block 2, an upper mold outer cover 3, an upper die prestressing ring 4, a lower die prestressing ring 5, an upper die upper pad 6, and a lower die lower pad Block 7, guide key 8, lower mold jacket 9, lower push rod 10, lower punch 11, cylindrical gear 12, rack 13, return spring 14, lower barrel 15, tooth-shaped die 16, process compensation space 18, Upper barrel 19, upper punch 20.

[0022] Figure 3(A) and Figure 3(B) show the working process of the die and the forming process of the forging when a single punch is extruded. The left half of Figure 3(A) is the discharging state, and the right half of Figure 3(A) It is the mold closing state; the left half of Figure 3(B) is the mold closing state, and the right half of Figure 3(B) is the final state of extrusion. As shown in the left half of Figure 3 (A), when the upper push rod 1, the upper die cushion block...

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Abstract

The invention relates to a forming die of a gearbox planet gear, belongs to the processing dies of car automatic gearbox planet gears, solves the problems in prior forging die, including big forging force, rigorous requirement for blanks, and short service life of the die, and satisfies the forming requirement of a car automatic gearbox planet gear. The forming die comprises an upper die and a lower die arranged symmetrically and vertically; the end faces of both an upper punch and a lower punch are bosses; a diffluent trough is formed on the boss of the lower punch; the shoulders of both the upper punch and the lower punch extend into a tooth-shaped cavity die by 1-2mm in the final extrusion state; a rotary ejection mechanism can also be arranged; the lower punch can rotate when being ejected; and a helical cylindrical gear with a bigger helix angle can be forged. The forming die has the advantages of simple structure, easy manufacture and installation, small forming force and low requirement for blanking precision. Furthermore, the forming die can realize single punch extrusion according to different die carriers and equipment, double punch extrusion in opposite directions, as well as the extrusion of the helical cylindrical gear with big helix angle.

Description

technical field [0001] The invention belongs to a processing die for a planetary gear of an automatic gearbox for a car, in particular to a forming die for a planetary gear of a gearbox. Background technique [0002] Helical cylindrical planetary gears are used in car automatic transmissions and are important power transmission components in cars. Its mechanical properties directly determine the safety and stability of the car. The traditional method mainly uses hobbing with gear shaping cutters. Since this method is cutting, the metal fibers are cut off, which reduces the strength of the gear and shortens the service life. Recently, some people have adopted the extrusion method for production. E.Deoge et al. proposed to use a punch with a mandrel and a floating die structure for hot forging. See E.Doege, R.Bohnsack, Closed die technologies for hot forging, Journal of Materials Processing Technology , Vol.98(2000)165-170; Y.B Park, D.Y Yang, in Finite element analysis for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J13/02B21K1/30
Inventor 金俊松王新云夏汉关董义夏巨谌胡国安
Owner HUAZHONG UNIV OF SCI & TECH
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