The purpose of tool shifting of automobile gear hob is to make all teeth of hob have about the same wear degree, so as to increase the service life of hob. The position relationship of each hob tooth should be ensured during the tool shifting of automobile gear hob....
Most of the inherent accuracy of the gear hob can be destroyed. Therefore, if the tolerance of tooth profile is very small, the diameter jump of automobile gear hob must be strictly controlled. First of all, the jumping of automobile gear hob leads to out of tolerance of tooth...
In general, the tooth side clearance of automobile gear is switched with the matching wheel. It only happens when the car gears mesh. In order to measure and calculate the clearance, the deformation of tooth thickness in the tooth groove must be found and measured. Unless otherwise specified, the...
Gear inspection is an important part of gear manufacturing. Lack of inspection and process control will lead to the outflow of unqualified gear parts. Therefore, this chapter will discuss some methods, equipment and tolerances for gear inspection. The basic inspection standards for automobile gear hob machining mainly include the...
Almost all auto gear hobs are made of high-speed steel. High speed steel is a tool steel with high hardness, high wear resistance and high heat resistance. It is characterized by excellent cutting ability and considerable toughness. Although all high-speed steels exhibit similar physical and mechanical properties, these properties...
In order to achieve the purpose of standardization, we classify automobile gear hobs according to manufacturing accuracy. The main purpose of dividing the automobile gear hob according to the accuracy grade is to select the appropriate hob more accurately and reasonably. The choice of accuracy grade of automobile gear...
In the process of tooth profile generation, the tooth profile of automobile gear hob works in conjugate form. The formation of conjugate hob tooth profile is that the hob and the workpiece rotate at a certain angular speed. Therefore, the automobile gear hob and the workpiece rotate at a...
Although most automotive gear hobs still have only one head number, multi head hobs have great advantages under appropriate working conditions. Generally speaking, most single head hobs belong to finishing hobs. The number of teeth of automobile gear hobs is relatively small, and the position of head number is...
The groove type of automobile gear hob is divided into straight groove and spiral groove. The straight groove is very convenient for users to grind again. When the lead angle is very small, the straight groove will only cause a small change in the tooth profile. If the lead...
The positions of the starting and final tangent points of the gear hob along the tooth axis are shown in the figure. For straight teeth: For helical teeth: Where E – cut in stroke; U — cut out stroke; B – gear width; H — cutting tooth depth; Dao...