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The rear cantilever shaft of T11 is a key component for the increase in production and localization of Shenlong Automobile Co., Ltd. It is mainly equipped with Dongfeng Peugeot 206 and other cars, with an annual output of 100,000 pieces. As a coupling of the rear axle, its outer circle has high precision (IT6) and the coaxiality requirement of the two shaft sections is not less than f0.02mm, which is a highly accurate part. Therefore, reasonable process and reliable tooling are prerequisites for processing quality.
Tooling design and principle <br> <br> shown in Figure 1, two stepped diameters f1 = f47 + 0.011 mm, f2 = f47.3-0.015mm, a difference of the radius 14.5mm.
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The most common process for shaft parts is the high-speed outer circle machining with wide grinding wheel. Since the length of the two sections is 107mm and 121mm respectively, the width of the grinding wheel generally used in China is generally 60mm, otherwise the grinding wheel is on the spindle of the machine tool. High precision requirements. If the width of the grinding wheel cannot exceed the length of the workpiece, it will inevitably cause two sections of tooling marks during the processing and the size of the parts fluctuates greatly, which cannot meet the requirements of mass production. To this end, the author uses the centerless grinding machine produced by Wuxi Machine Tool Plant, using the cutting forming process for processing, the specific analysis is as follows.
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After the process design <br> <br> T11 cantilever shaft (3) the process consists of the following components: → cutting → roughing outer cylindrical coarse → car face, reaming and inverted inside and outside corners → hardening → coarse Outer circle → rough cut outer circle → fine cut into the outer circle.
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Tooling design (1) The pin is shown in Figure 4. The pin is directly mounted on the work surface of the centerless grinder. The main point of the design is to install the rolling bearing (1000900) on the end face. When the rear cantilever shaft is rotated by the grinding force, the pin end face Relying on bearing rotation reduces the friction with the workpiece.
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Adjusting <br> <br> summary, pallet wheel cam plate, the cam plate and the guide wheel stopper pin comprise the entire cutting shaping system, so when the machine adjustment must follow the following principles:
(1) The step surface of the pallet, the contour plate of the grinding wheel and the contour of the guide wheel are adjusted as much as possible to the front of the step surface of the grinding wheel, followed by the step surface of the pallet, and finally the step surface of the guide wheel.
(2) After each dressing of the grinding wheel, it must be checked whether the first step is satisfied, and if it is changed, the first step is re-completed.
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Process assurance capability
In order to ensure that the factory safety parts are 100% qualified, the measurement system adopts Wuxi Furui SPC workstation, and based on the recently measured 125 data, the following conclusions are drawn:
(1) Full bounce f0.02mm Through the processing of Minitab software, the process capability index can be obtained as shown in Fig. 7. It is known that the process and product requirements are met by CPK=2.13≥1.33.
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Conclusion <br> <br> centerless grinding machine has a variety of ways, but different processing methods there are differences in the processing of results. From the ability to meet the processing technology and meet the technical requirements for analysis, with the continuous updating of the manufacturing process and tools, the practicality of the centerless grinding machine into the forming process will be more widely improved, the processing capability and accuracy of the parts will be more and more easily.
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