Huangshan High Pressure Valve Co., Ltd. Forging Branch Zhanglong Irrigation Rear axle cone drive gear is the transmission force component of the rear axle transmission system of the automobile chassis. It is the key component of the automobile drive, and its product quality is directly related to the driving safety of the automobile. Because the quality requirements of the 询 bridge cone active inquiry wheel forgings are relatively high, how to improve the process design, avoid forging defects, improve the quality of the product, and the goal of continuous research and continuous exploration by designers.
We are a professional manufacturer of automotive forgings. We have a 20 MN hot forging press as the main engine and 500 kW medium frequency heating forging production line. We have produced ten kinds of automobile forgings for several years. In 1995, our factory began to support a car manufacturer in the rear axle cone drive gear forgings (see). According to incomplete statistics, up to now, more than 22,000 sets of rear axle cone drive gear forgings have been produced. The forging process has also been changed from the original traditional process to the current new process.
The traditional process of forging the rear axle cone drive gear on the hot forging press includes five steps of heating, rolling, upsetting, final forging and trimming, but the rear axle cone driving gear forgings produced have always existed such as 111. The difference in diameter section is large, the continuous part I of the cone head and the cone rod is folded, the IT head of the cone tail is not full (see), and the distribution of the giant flying edge is very uneven, and the material waste is strict. 1. After investigation and demonstration It is found that the main problem lies in the following three aspects: the ratio of the cross-sectional area of ​​the head to the cone tail is large, which is the main reason for wasting material. It is necessary to consider both the aggregate of the cone and the filling of the cone, and it is not possible to waste material. The actual blanking specifications we have adopted are 70mm x 160mm, the weight is 4.8kf, the net forging is 3.8kg, and the actual material utilization rate is 79%. However, the f metal flow is unreasonable when rolling the groove blank. If this is the key ring in the forming process. Inappropriate roll blanking 90 release A pre-forging hard cavity pre-formation, it is necessary to generate a discount at the joint between the cone head and the cone rod (see).
The positioning of the forging cavity is related to the filling of the tail portion of the cone, so the quality of the cable is also critical. Before the adoption of the new process, due to the operator's mistakes, the phenomenon of product registration from W was also severe.
How to effectively improve the utilization rate of materials. Reduce the cost, avoid the folding of the cone and the cone to the joint, reduce the calving of the waste, and the foot T: the art improved 0.
At the beginning of 1998, we improved the traditional craftsmanship. , Xin Ding Yi includes 4 Ding Order: heating + vertical pre-forging horizontal final forging - trimming. The new process is less than the traditional art, and the original rolling process is 90. The horizontal pre-forging is improved to remove the oxide skin after the billet is heated. The vertical pre-forging is carried out - considering the closing height of the 20MN hot forging force machine The upper mold is designed as a whole mold, and the lower mold is designed as a combined mold. The lower mold is mainly composed of a pre-forging die edging, a pressing ring and a lower die device.
Design point 1 In order to ensure that the cone head and the cone tail part can be completely filled, the volume of the ball head part of the pre-forging blank should be more than i5% larger than the actual volume of the cone head, and the cavity depth of the pre-forging die should not be less than 220mm anti-Maple person (hot WT ) 2000th! Long 2丨. The transition fillet of the lower model cavity and the surface part (see mark/section) should not be too small or too large; when it is too large or too small, the joint between the cone and the cone will be folded.
According to our use of the test, to take the most appropriate.
The deep hole is directly forged, and the wrong shift <0,7mm uses a new process to forge the rear axle cone drive wheel, which has achieved the economic benefits of Kunruo.
: It is in direct contact with the main pad. Therefore, if it is designed in the traditional way, there is no lower topping, and it is necessary to re-set the topping material (see Box 4). The top material stroke is designed to be grounded at the upper end of the 20mmt top material rod for easy operation.
3. Process specifications The new T. Art disaster material is x27Smm, the amount is material utilization rate is 88.5%. Third, the comparison of the two processes (below clothing) bookmark3 new and old technology comparison table repairs 99.5 before the mouthwash, forgings The quality of the appearance has also been significantly improved.
For example, only forging materials can save 3000k operation.
However, the cost has increased, and the delivery cycle has also been affected; the new process is guaranteed to be delivered in a timely manner due to low rework and low waste.
Heating, pre-1.3k! Forging, final forging, I trimming, etc. å±®: å±® å±® - f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f f ä» ä»After several years of practice, the new technology of Biwe s forged bamboo slabs has proven to be mature. According to the new technology, the forgings produced by the cattle are used by the user. The quality of the forgings is significantly higher than that of the forgings produced by the traditional process. The WIL forging materials also save about 0.5kg compared with the traditional process materials. Now, our factory has produced the most cattle in accordance with the new technology.
At the same time, the successful use of the mold also explores the method of how to form the slender shaft forgings in the hot forging press; through the further research on the mold, we have succeeded in Hot forging press with less flying edge or no S edge precision forging along the bridge transmission spline shaft series slender shaft forgings (see), ball head 丨: type 屮h two wheel height difference D spiral coil center diameter H "The lead of the spiral coil B. The two wheels are at the center of the coil. The arc of the arc is K. When the circle passes between the driving wheel and the wheel, it can be formed by bending the half turn and generating a helix angle. Reduce the bending resistance.
We are also installing a pulley on the wheel frame 4. After bending a round cymbal, another round tube can be welded, and the weld seam is polished, and then the feeding is continued. This can be continuously bent, after bending for three to four weeks. Use the driving to hang the coil and slowly bend it. The spiral coil is bent to support the fixed coil to prevent deformation.
The spiral coils we processed by this method are not only beautiful and generous, but also all technical indicators meet the requirements, saving a lot of money for our factory. At the same time, the improved pipe bending machine expands the processing range on the basis of ensuring the performance of the original equipment, thereby greatly improving the production efficiency.
Robot (Hot Jiading) 2 years i lang
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