Common Issues in Gear Processing Technology

Release time:

2022-05-30 11:48

1 The number of teeth is incorrect. The total number of teeth around the entire circumference of the gear is called the number of teeth. The principles and requirements for determining the number of teeth of a gear first require the initial determination of the gear modulus and the diameter of the transmission shaft to meet structural requirements. First, the selection of the hob is incorrect. Due to the complexity of the gear tooth profile, the factors affecting its processing accuracy are also very complex and variable. In addition to the inherent accuracy of the gear hobbing equipment, the installation and adjustment of the tooth blank, the material of the gear, heat treatment, and other factors, the reasonable selection of the gear hob is also very important. The error in the number of teeth can cause instantaneous changes in the transmission ratio during the meshing process of each pair of gears. Secondly, the size of the workpiece blank is incorrect. Traditional blank size reference design ignores the differences in the process, and uniformly takes the size references of each part in the drawing as the blank size reference, resulting in an increase in excess material error during subsequent processing and wasting materials. Thirdly, the direction of additional motion is incorrect. When processing helical gears on a hobbing machine, it is relatively difficult to determine the direction of additional motion, and the changes in factors such as milling method, workpiece spiral direction, and hob spiral direction further increase the difficulty of judgment.

2 The tooth profile is asymmetric. First, the hob is not aligned properly. The quality of the hob installation affects the radial and axial runout of the hob, ultimately affecting the tooth cutting accuracy. Generally, it is advisable to first correct the tool axis before installing the hob, controlling the radial circular runout at both ends to be less than 0.005mm. The perpendicularity of the step and the end face of the nut to the axis should be less than 0.01mm, and the washer should be hardened and ground flat. When the hob is mounted on the tool axis, the radial circular runout of both sides of the boss needs to be corrected to make it as "synchronous" as possible, meaning that the highest points of the radial circular runout at both ends are in the same direction. Secondly, after grinding the hob, the spiral angle or lead error is large. Commonly used tools for processing external meshing straight and helical cylindrical gears. During processing, the hob is equivalent to a helical gear with a very large spiral angle, and its number of teeth is the number of teeth on the hob, while the workpiece is equivalent to another helical gear, meshing in space according to a pair of helical gears, rotating at a fixed speed ratio, with the tooth profile of the gear formed by the successive cutting of the teeth at adjacent positions.

3 Tooth profile error. Tooth profile error refers to the normal distance between two ideal tooth profile (involute) outlines that encompass the actual tooth profile outline within the tooth profile working department. The gear hob is one of the most commonly used tools for processing external meshing straight and helical cylindrical involute gears. The axial cross-section of the side and rear cutting face of this hob is linear. If it is used to replace the involute hob for tooth cutting, the resulting gear tooth profile is not an involute, thus theoretically causing a certain tooth profile error, known as the shaping error of the gear hob. Additionally, it is impossible to obtain a completely accurate involute tooth profile during actual processing; various errors always exist, thereby affecting the stability of transmission. The base circle of the gear is the only parameter that determines the involute tooth profile. If there is an error in the base circle during hobbing processing, there will inevitably be an error in the tooth profile.

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Warmly welcome the leaders of the Guangdong Province Robot Association at all levels to visit and guide our company.

Introduction to Micro DC Gear Motors

Introduction to Micro DC Gear Motors   Micro DC gear motors are a miniaturized motor system, typically consisting of a DC motor and a gearbox. Here are some related introductions to micro DC gear motors:   DC Motor Section: Working Principle: The DC motor generates current by moving a conductive coil in a magnetic field, thus producing electromagnetic force to drive the motor's rotation. Structure: Micro DC motors usually adopt a separate structure, including an armature (rotating part) and an electromagnet (stator part). Types: Common types of DC motors include brushed DC motors and brushless DC motors. Brushed DC motors use brushes to connect to the armature, while brushless DC motors control current through an electronic speed controller, eliminating the need for brushes.   Gearbox Section: Function: The gearbox is used to slow down the motor's output speed while increasing torque. This is crucial for applications requiring higher torque and lower speeds, such as robotic arms and camera gimbals. Structure: Gearboxes typically consist of gears that achieve the reduction ratio through different gear combinations. The reduction ratio is the ratio of input speed to output speed. Types: Common types of gearboxes include planetary gears, worm gears, and helical gears. Different types of gearboxes are suitable for different application scenarios.   Applications: Micro DC gear motors are widely used in various fields, including consumer electronics (such as cameras and printers), medical devices, robotics, and automotive electronics. In these applications, micro DC gear motors are typically used to control precise movements, provide sufficient torque, and achieve efficient performance in limited spaces.   Control and Drive: Micro DC gear motors usually require corresponding electronic speed controllers or controllers to precisely control rotation speed and direction. The control system can adjust the motor's output according to application needs, achieving precise position control and speed regulation.   Performance Parameters: The performance parameters of micro DC gear motors include rated voltage, rated speed, rated torque, efficiency, etc. These parameters are crucial for selecting and designing motor systems.   In summary, micro DC gear motors have been widely applied under the trends of miniaturization, precision, and efficiency, providing reliable driving force for many electric devices and systems.          

Contact Information

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Mobile Phone: +86 180 0260 1103

Email: sunweihong@silentgear.cn
Factory Address: No. 15, Century Road, Baihao Industrial Zone, Houjie Town, Dongguan City, Guangdong Province

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