阅读说明：本技术 一种梯形齿加工方法 (Trapezoidal tooth machining method ) 是由 周友国 王虎 陈绍龙 蒋西怀 毛伟红 杨茜 付卫芳 于 2021-08-16 设计创作，主要内容包括：发明提供一种梯形齿加工方法。该加工方法包括设计滚刀刀具、将齿坯装夹在加工机床上、采用滚齿工艺使用展成法加工梯形齿、对梯形齿进行热处理等步骤。该加工方法打破传统的思维模式,通过工艺创新,采用梯形齿成型原理,利用展成法加工,加工效率、精度、合格率可以得到大幅度提升。(The invention provides a trapezoidal tooth machining method. The processing method comprises the steps of designing a hobbing cutter, clamping a gear blank on a processing machine tool, processing the trapezoidal gear by adopting a generating method through a hobbing process, carrying out heat treatment on the trapezoidal gear and the like. The processing method breaks through the traditional thinking mode, through technological innovation, the trapezoidal tooth forming principle is adopted, the generating method is utilized for processing, and the processing efficiency, the precision and the qualification rate can be greatly improved.)

1. A trapezoidal tooth machining method is characterized by comprising the following steps:

1) designing a hob cutter according to the structure of the trapezoidal teeth (5) to be processed; the hob cutter comprises a cutter body (1) and a cutter rod; the cutter body (1) is provided with a cutter bar mounting hole (101) along the axial direction; the two end surfaces of the cutter body (1) extend out of the pillow block (2); a plurality of rows of cutter teeth (3) are uniformly arranged on the outer wall of the cutter body (1); chip flutes (4) are arranged between two adjacent rows of cutter teeth (3); the length direction of the chip groove (4) is the same as the axial direction of the cutter body (1); the tooth profile curve of the cutter tooth (3) is obtained through the tooth profile back calculation of the trapezoidal tooth (5) to be processed; the cutter teeth (3) are meshed with the machined trapezoidal teeth (5); the cutter tooth (3) includes a main cutting edge (T1), a transition cutting edge (T2), and a crest edge (T3);

2) clamping the gear blank on a processing machine tool;

3) processing the trapezoidal teeth (5) by a generating method by adopting a hobbing process; the hobbing cutter and the tooth blank keep a forced meshing relationship, and the hobbing cutter cuts off materials which interfere with the movement of the tooth blank, so that the tooth profile of the trapezoidal teeth (5) is machined.

2. A method for machining trapezoidal teeth according to claim 1, wherein step 3) is preceded by the step of adjusting the optimization parameters to minimize the tooth profile deviation:

a. programming a processing program, and performing trial processing;

b. detecting the first workpiece, adjusting the program according to the result, and improving a hob cutter and a clamp if necessary;

c. and (5) curing.

3. A trapezoidal tooth machining method according to claim 1, characterized in that: step 3) is followed by a related step of heat treating the trapezoidal teeth (5).

Technical Field

The invention relates to the technical field of AT transmissions, in particular to a trapezoidal tooth machining method.

Background

The trapezoidal tooth structure is applied more in the mechanical industry, and the processing mode mainly comprises laser cutting, milling and linear cutting, but all have the problem of different degrees. For example, laser cutting has high efficiency, but the precision can not meet the requirement. Wire cutting is highly accurate but inefficient. The milling mode has precision, the qualification rate is between the two processes, the efficiency is low, the precision is poor, and the complete progress of a product assembly is seriously influenced.

Therefore, it is necessary to develop a method for machining trapezoidal teeth to provide reference for process design.

Disclosure of Invention

The invention aims to provide a trapezoidal tooth machining method to solve the problems in the prior art.

The technical scheme adopted for achieving the purpose of the invention is that the trapezoidal tooth machining method comprises the following steps:

1) and designing a hobbing cutter according to the structure of the trapezoidal teeth to be processed. Wherein, hobbing cutter includes cutter body and cutter arbor. The cutter body is provided with a cutter bar mounting hole along the axial direction. The two end faces of the cutter body extend out of the pillow block. A plurality of rows of cutter teeth are uniformly arranged on the outer wall of the cutter body. Chip pockets are arranged between two adjacent rows of cutter teeth. The length direction of the chip groove is the same as the axial direction of the cutter body. The tooth profile curve of the cutter tooth is obtained through the tooth profile back calculation of the trapezoidal tooth to be processed. The cutter teeth are meshed with the machined trapezoidal teeth. The cutter teeth include a main cutting edge, a transition cutting edge, and a crest edge.

2) And clamping the gear blank on a processing machine tool.

3) The trapezoidal teeth are processed by a generating method by adopting a hobbing process. The hobbing cutter and the tooth blank keep a forced meshing relationship, and the hobbing cutter cuts off materials which interfere with the movement of the tooth blank, so that the tooth profile of the trapezoidal tooth is machined.

Further, before step 3), there is a related step of adjusting the optimization parameters to minimize the tooth profile deviation:

a. and programming a processing program and performing trial processing.

b. And detecting the first workpiece, adjusting the program according to the result, and improving the hob cutter and the clamp if necessary.

c. And (5) curing.

Further, step 3) is followed by the associated step of heat treating the trapezoidal teeth.

The technical effects of the invention are undoubted: the traditional thinking mode is broken through, the processing efficiency, the precision and the qualification rate can be greatly improved by adopting the trapezoidal tooth forming principle and the generating method through process innovation.

Drawings

FIG. 1 is a schematic structural view of a hob body;

FIG. 2 is a side view of the hob body;

FIG. 3 is a schematic view of a cutter tooth structure;

FIG. 4 is a schematic view of the process;

fig. 5 is a schematic structural view of a trapezoidal tooth part.

In the figure: the hob body 1, the cutter bar mounting hole 101, the pillow block 2, the cutter teeth 3, the chip flutes 4, the trapezoidal teeth 5, the main cutting edge T1, the transition cutting edge T2 and the tooth top edge T3.

Detailed Description

The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.

Example 1:

the embodiment provides a trapezoidal tooth machining method, which comprises the following steps:

1) and designing a hobbing cutter according to the structure of the trapezoidal teeth 5 to be processed. Referring to fig. 1 to 3, the hob cutter includes a cutter body 1 and a cutter bar. The cutter body 1 is provided with a cutter bar mounting hole 101 along the axial direction. Two end faces of the cutter body 1 extend out of the pillow block 2. A plurality of rows of cutter teeth 3 are uniformly arranged on the outer wall of the cutter body 1. And a chip groove 4 is formed between every two adjacent rows of cutter teeth 3. The length direction of the chip grooves 4 is the same as the axial direction of the cutter body 1. The tooth profile curve of the cutter teeth 3 is obtained by the tooth profile back calculation of the trapezoidal teeth 5 to be processed. The cutter teeth 3 are meshed with the machined trapezoidal teeth 5. The tooth 3 includes a main cutting edge T1, a transition cutting edge T2, and a crest edge T3.

2) And clamping the gear blank on a processing machine tool.

3) Adjusting optimization parameters to minimize tooth profile deviation:

a. and programming a processing program and performing trial processing.

b. And detecting the first workpiece, adjusting the program according to the result, and improving the hob cutter and the clamp if necessary.

c. And (5) curing.

4) The trapezoidal teeth 5 are machined by a generating method by adopting a hobbing process. Referring to fig. 4, the positive engagement between the hob cutter and the tooth blank is maintained, and the hob cutter cuts away material from the tooth blank that interferes with the movement of the tooth blank, thereby producing the tooth profile of the trapezoidal teeth 5. The process of hobbing is equivalent to the process of meshing and rolling of a pair of helical gears to generate motion, and the motion is to form an involute (generatrix). The generating method is a composite motion of the rotary motion of the hob and the rotary motion of the workpiece.

5) The trapezoidal teeth 5 are heat-treated.

Example 2:

the AT gearbox is provided with a plurality of parts with trapezoidal tooth structures, and the main function of the AT gearbox is to play a role in guiding when a friction plate moves. AT the present stage, the trapezoidal teeth of the AT gearbox part are machined in a milling mode, so that the efficiency is low, the precision is poor, the qualified rate is low, and the complete set of progress of a product assembly is seriously influenced. AT present, the trapezoidal tooth milling of the AT gearbox needs 180min, and the qualified rate is lower than 65%. Because the parts occupy equipment (vertical machining centers) for a long time, the production schedule of other parts is influenced.

The main steps of the present embodiment are the same as those of embodiment 1, wherein, referring to fig. 5, the present embodiment is used for processing trapezoidal tooth parts such as a sun gear connecting disc, a clutch connecting disc, a baffle plate and the like of an AT transmission case. By analyzing the tooth shape, precision and forming principle of the trapezoidal teeth, a generating method is adopted for processing on the gear hobbing machine. Compared with the prior trapezoidal tooth processing method adopting a linear cutting and milling mode, the novel processing mode meets the technical requirements of products, and simultaneously, the efficiency is improved by more than 70% (the prior processing time exceeds 180 min/piece, and is now less than 40 min/piece). Through the contrast, after the trapezoidal tooth is machined by the gear hobbing machine, the cost of the cutter is reduced, the machining beat is reduced, and the qualification rate is improved.