Hot-cold combined forming method for star-shaped sleeve of constant velocity universal joint
A constant velocity universal joint and star sleeve technology, applied in the field of metal plastic forming, can solve the problems of long process route, low efficiency, high cost, etc., achieve high material utilization rate, increase production efficiency, reduce energy consumption and production cost effect
Active Publication Date: 2013-11-06
JIANGSU SUNWAY PRECISION FORGING
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Problems solved by technology
The disadvantage is that the process route is long, multiple surface treatments and annealing treatments are required in the middle, the cost is high, the cycle is long, and the efficiency is not high
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[0022] The constant velocity universal joint AC98 star sleeve is used in family cars such as Santana. The following takes the processing process of the constant velocity universal joint AC98 star sleeve as an example for further detailed description. The process flow is: 1. Medium frequency heating of the bar, 2. High-speed hot forging, 3. Controlled cooling, 4. Conventional surface treatment, 5. Block forming.
[0023] 1. The bar is heated by intermediate frequency, and the hot-rolled bar with a diameter of φ32mm and a length of 6000mm is selected as the raw material. The material grade is 16MnCr5H. -1280°C.
[0024] 2. High-speed upsetting. The high-speed upsetting refers to the use of Hatebur high-speed hot upsetting machine to form hot forging blanks. The high-speed upsetting machine is an automatic equipment. Hole, four stations complete the forming of the hot forging blank. The shearing station is to cut the heated bar to the required length, and the cutting length sho...
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Abstract
The invention discloses a hot-cold combined forming method for a star-shaped sleeve of a constant velocity universal joint. The method comprises the following process steps of: (1) heating a rod material at a medium frequency, and heating a hot-rolled rod material with an appropriate diameter specification serving as a raw material to 1,220-1,280 DEG C in a medium-frequency induction heating furnace; (2) performing hot upset forging at a high speed, and conveying the raw material which is heated to 1,220-1,280 DEG C in the previous process to a high-speed hot upset forging machine for performing hot forging forming; (3) performing controlled cooling: conveying a workpiece which is subjected to hot upset forging at a high speed to a controlled cooling furnace, and performing controlled cooling by using the residual heat of the hot-forged workpiece; (4) performing conventional surface treatment; and (5) blocking and forming to obtain a product meeting the requirements of structure property and size accuracy. Due to the adoption of the method, the structure and the product accuracy of the workpiece are ensured, the material utilization ratio is high, the forming process flow is shortened, the production efficiency is greatly increased, the the requirement of batch production can be met, and the energy consumption and environment pollution are lowered.
Description
technical field [0001] The invention relates to a metal plastic forming technology, in particular to the forming technology of a constant velocity universal joint star sleeve for a transmission shaft of an automobile. Background technique [0002] There are two main processing methods for constant velocity universal joint star sleeve parts: the first is to use the traditional hot die forging process, and the second is to simply use the cold forging process. The process of the first process is: sawing, heating, upsetting, and forming. The advantages of this process are that the hot forged metal has good plasticity, low flow stress, easy forming of the workpiece, low requirements for mold manufacturing accuracy, and simple process flow. But there are also several disadvantages at the same time, the subsequent machining allowance is large, the material utilization rate is low, the mold life is low, and subsequent normalizing treatment is required. The specific steps of the sec...
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IPC IPC(8): B23P15/14
Inventor 徐祥前龚爱军袁兆峰
Owner JIANGSU SUNWAY PRECISION FORGING