The introduction of machining allowance and blank size of ge

Gear oil pump parts material is HT200, the production type is mass production, using machine sand box casting.

The minimum wall thickness of the casting shall be BBB 0 4.5mm.

The difference of wall thickness should not be too large to avoid the shrinkage crack, shrinkage cavity and crack caused by the temperature difference of each part.

The casting shall be artificially aged.

Remove residual stress and then send to the machining workshop for processing, otherwise the workpiece will produce large deformation.

Reasonable choice of cutting amount, to ensure the machining accuracy and surface quality, improve productivity and tool durability, have a great impact.

Selecting cutting amount refers to selecting cutting depth, feed and cutting speed.

Of the three factors, cutting speed has the greatest impact on tool durability, followed by feed, while cutting depth has the least impact.

The feed has the greatest influence on the surface roughness, while the cutting speed has the greatest influence on the cutting force.

Therefore, in the rough machining stage, it should be considered to choose the maximum depth of cutting, followed by the selection of a larger feed, and finally determine a suitable cutting speed.

In the semi-finishing, finishing stage, due to the processing accuracy and surface quality requirements are higher, therefore, generally choose a smaller cutting depth and feed.

Under the premise of ensuring tool durability, higher cutting speed should be selected to ensure the requirements of processing quality and productivity.

In mass production, for multi - tool machine tools, automatic machine tools, copying machine tools and modular machine tools, it is generally necessary to determine the cutting amount.

In general, often by the operator according to the specific circumstances of the process to choose a reasonable cutting amount.

To simplify the selection of cutting dosage, it can be generally selected from the relevant information.

This graduation design for us who are about to graduate from the school of senior students, it can be said that it is a very meaningful exercise for us to be on the job after the last time.

In fact, for senior students, it is common to do design. Through the training of course design at the end of each semester for four years, we are no longer afraid and annoyed at the beginning to face or want to learn a positive attitude towards doing design.

In these four years, we gradually learned from our design, including textbook knowledge, factory experience and even the attitude to work in life.

Especially in the design process of outstanding performance, began to do this design, get the subject in the heart is so at a loss, at a loss, on the subject do not know how to start.

After I said what I thought to my tutor Kan Honglin, the teacher helped me slowly analyze the peeling, so that I understood that my subject was not so difficult, in fact, it was a combination of the course design that we had done before, so that I also had a relatively clear general idea when I was doing design.

In the design, I also learned a lot of software that we will often use in our work.

For example, SolidWorks is a software often used by many companies for three-dimensional modeling, and CAD. Although we have learned it before, this time I not only got familiar with this software again, but also learned something I had never known before.

During the design process, the teacher emphasized the importance of drawing for our mechanical students in the future work.

In fact, the study of each kind of software is very helpful to us, and we have only learned a little bit. In the future work, we will pay more attention to this aspect of study.

Gear oil pump, as a typical hydraulic power element, is widely used in many industrial fields such as machine tool industry, agricultural machinery, engineering machinery, aerospace and shipbuilding industry.

Its structure is simple, the main two gears constitute its main working parts, compared with the vane pump (vane, rotor and other accessories) and various types of piston pump (swash plate, piston, cylinder and return plate and other parts) in the original design, manufacturing technology, as well as processing means has incomparable advantages.

It is only by a pair of meshing gears and the pump body of three parts, so it is small size, light weight, easy manufacture, can rely on, low cost, is not sensitive to oil, strong self-priming capacity, convenient maintenance, on many occasions of conveying liquid have been applied, all kinds of gear oil pump volume has reached millions of sets, and output value of billions of RMB.

Although vane pump, piston pump and other better performance, but because of its shortcomings of oil pollution sensitivity, high production cost, so the gear pump did not disappear but steadily increased production.

In this design, I found some deficiencies of gear oil pump. With the development of society and the continuous progress of science and technology, the accuracy of our original gear oil pump has been unable to adapt to the social factory processing. We should study more accurate gear oil pump, such as nanometer and micron level.

At the same time, the inevitable cavitation phenomenon of the gear pump is a big problem for the efficiency of the gear pump. We can conduct further research in this aspect, hoping to find more ways to reduce or even eliminate this phenomenon in order to improve the efficiency of the gear pump.

The above is "for the gear oil pump machining allowance, blank size introduction"