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Installation process of CNC machining

With the continuous development of industry, people’s living standards continue to improve. When Xiaobian talks about CNC processing, we feel very familiar, mainly because it is often carried out. As a skilled CNC programming operator, after understanding the machining requirements, process routes and machine characteristics of precision mechanical parts, he can operate the CNC machining machine to complete the task. Therefore, the working principle of CNC machining is divided into several points:

Firstly, in the clamping process, in order to simplify the machining origin of each positioning surface relative to CNC machining center, there should be accurate coordinate size. Secondly, the direction of mechanical parts installation is consistent with the workpiece coordinate system and machine coordinate system selected in programming, and directional installation. In the production and processing of batch precision mechanical parts, it is necessary to consider the fixture which can be disassembled in a short time and changed into a fixture suitable for new workpiece. Because the auxiliary time of CNC machining center has been compressed very short, the loading and unloading of supporting fixture can not take up too much time.

In the production of the fixture, should have as few workpieces as possible and higher stiffness. The fixture should be open as far as possible, the space position of clamping workpiece can be low or low, and the installation fixture can not interfere with the tool path. In order to avoid affecting the processing process, ensure that the processing content of the workpiece is completed within the stroke range of the spindle!

When there is an interactive worktable in CNC machining, the fixture design must prevent the spatial interference between the fixture and the machine tool due to the movement, up support, down support and rotation of the worktable. Try to finish all the processing contents in one clamping. When it is necessary to replace the clamping point, special attention should be paid not to damage the positioning accuracy due to the replacement of the clamping point. If necessary, it should be explained in the drawing processing technology

Cover plate parts of CNC processing technology

In order to improve our work efficiency, we often carry out CNC processing, we are familiar with it. Pay attention to details when processing to avoid problems. Today, I’d like to discuss the cover parts of CNC machining process with you

Process analysis of parts

The material of cover plate is cast iron, and the blank is casting. The cover plate needs to be processed for the plane, hole and thread are concentrated on a, B surface, the four sides of the edge do not need to be processed, the highest accuracy should reach it7 level. Then we can take the A-side as the positioning reference, and process it in the previous process. Select the B-side and the hole on the B-side to process on the machining center.

Design process

(1) Select processing method

Rough milling can be used for surface B_ Finish milling: the dimension accuracy of Φ 60h7 hole is it7, The roughness is ra0.8um, and the blank hole has been cast, so rough boring and semi precision boring can be carried out+ Fine boring: the dimension accuracy of Φ 12h8 hole is required to be grade it8, and the roughness is ra0.8um. In order to prevent the drilling deviation, we can drill the center hole, drill the hole, enlarge the hole, ream the hole; when the thread hole is between M6 and M20, we can drill the bottom hole first and then tap the thread.

(2) Determine the processing sequence

In order to reduce the frequency of tool change and according to the principle of rough before finish and face to hole, the processing route is as follows: rough and finish milling B surface – coarse, semi finish, finish boring Φ 60h7 – drilling the center hole of each smooth hole and threaded hole – drilling, expanding 4 × Φ 2h8 hole – countersinking 4 × Φ 16 hole – twisting 4 × Φ 12h8 hole – M16 screw hole, drilling bottom hole, chamfering and tapping.

Simplified operation of CNC machining

For the long-term development trend of industry, there will be a variety of modern scientific and technological development, to get different industrial products production and processing. In the process of getting new processing procedures, the processing of “CNC processing” will get new operation procedures. Then in the development of modern industry, any trend change will get new technological innovation, making life begin to move towards a better direction. Therefore, for the development stage of CNC processing, there will be more appropriate trend processing process. Similarly, more technical operations will be carried out according to different processes.

Facing the development of various science and technology, it can be said that this era has begun to enter a prosperous stage. In different countries, different regions, the industrial development field is also constantly expanding to get better technology operation process. Then, in the development process of different industrial projects, more work will be carried out according to different national science and technology Industrial processing, also for different machinery and equipment, different industrial technology to get a simple but efficient technical operation process. Therefore, in the process of slow historical changes, the development of industry will get more changes and technological updates.

The process of “CNC processing” is to get more operation according to more process operation. For the current industrial development, will get more functional changes, to carry out different processing procedures, for the simplified operation of CNC processing, mainly for the development of high-tech processes, but also will get different scientific and technological processing process. So in the process of different industrial technology capacity changes, there will be a new processing trend.

The processing route of “CNC machining”

rous operation, Dongguan CNC processing will also have new process processing changes.

But in different steps to carry out the specified CNC processing process, will be based on the better development trend, to get the processing change trend of different processes. Then, in the process of more steps, there will be different change operations. Therefore, in the process of CNC machining operation steps, the appropriate technology operation will be obtained, and the appropriate functional operation trend will be carried out. But in the process of specified steps processing, for CNC (computer gongs) processing trends, will be carried out in different steps.

Different processing routes will have better development and Realization of operation process, can carry out different change trend, and also can get better step processing trend according to the actual processing process. Therefore, for the CNC processing steps in the process of operation, to carry out a better function. In order to ensure the realization of various high-tech processing, it is necessary to ensure the process of determining the processing route to carry out better function operation. In the process of determining the CNC processing route, different processes will be carried out.

Application scope of machining

A mechanical part is composed of several surfaces. To study the relative relationship of parts’ surfaces, a datum must be determined. The datum is the point, line and plane on which the position of other points, lines and surfaces can be determined. According to the different functions of benchmarks, benchmarks can be divided into design basis and process basis. Today, I will take you to know what range of machining is applicable to?

All kinds of metal parts processing;
Sheet metal, box and metal structure;
Mechanical processing of titanium alloy, high temperature alloy, non-metal, etc;
Wind tunnel combustor design and manufacture;
Non standard equipment design and manufacture.
Mold design and manufacturing.

Application scope of machining

This refers to the process of changing the overall dimension or performance of the workpiece through a kind of mechanical equipment. According to the difference in processing methods, it can be divided into cutting and pressure machining. Today we will learn about the scope of machining?

All kinds of metal parts processing;
Sheet metal, box and metal structure;
Mechanical processing of titanium alloy, high temperature alloy, non-metal, etc;
Wind tunnel combustor design and manufacture;
Non standard equipment design and manufacture.
Mold design and manufacturing.

Requirements for materials for precision machining

Not all materials can be processed precisely. The requirements of precision machining are very high and very strict. Let’s talk about what requirements do precision hardware processing have on materials?

For metal materials, the hardness is the largest for stainless steel, followed by cast iron, followed by copper and aluminum. The processing of ceramics and plastics belongs to the processing of non-metallic materials.

first, the hardness of materials is required. For some occasions, the higher the hardness of the material is, the better, but it is limited to the hardness requirements of the machined parts. The processed materials cannot be too hard, and if it is still hard than the machine parts, it cannot be processed.
secondly, the material is moderate in soft and hard, at least one grade lower than the hardness of the machine piece. At the same time, it also depends on the function of the processed device for the reasonable selection of parts.

Therefore, the most basic one is to pay attention to the density of materials before processing. If the density is too large, it is equivalent to the hardness. If the hardness exceeds the hardness of the machine parts (lathe tool), it cannot be processed, not only damage the parts, but also cause danger, such as the flying and falling of the lathe knife and injuring people. Therefore, generally speaking, for hardware processing, the material material should be lower than the hardness of the machine tool, so that can be processed.

Application scope of machining

All kinds of metal parts processing;
Sheet metal, box and metal structure;
Mechanical processing of titanium alloy, high temperature alloy, non-metal, etc;
Wind tunnel combustor design and manufacture;
Non standard equipment design and manufacture.
Mold design and manufacturing.

Standard classification of machining

A mechanical part is composed of several surfaces. To study the relative relationship of parts’ surfaces, a datum must be determined. The datum is the point, line and plane on which the position of other points, lines and surfaces can be determined. According to the different functions of datum, machining datum can be divided into design datum and technological datum.

Machining design datum: the datum used to determine the position of other points, lines and planes on the part drawing, which is called design datum.

Machining process datum: the datum used in the process of machining and assembling parts, which is called process datum. According to different uses, process datum can be divided into assembly datum, measuring datum and locating datum.

(1) Assembly datum: the datum used to determine the position of parts in parts or products during assembly, which is called assembly datum.

(2) Measurement datum: the datum used to check the size and position of machined surface, which is called measuring datum.

(3) Positioning datum: the datum used for workpiece positioning during machining, which is called positioning datum. The surface (or line or point) used as the reference for positioning

In the process, only the rough blank surface can be selected. This positioning surface is called the rough datum. In the subsequent processes, the machined surface can be used as the positioning reference, and the positioning surface is called the fine basis

Machining error of Automatic Parts

The machining error of Automatic Parts refers to the degree of deviation between the actual geometric parameters (geometric size, geometric shape and mutual position) and the ideal geometric parameters. The smaller the machining error is, the higher the degree of conformity is, the higher the machining accuracy is. Machining accuracy and machining error are two ways of saying a problem.

Automatic parts processing positioning error: positioning error mainly includes the datum misalignment error and positioning pair manufacturing inaccuracy error.
Measurement error of automatic parts processing: when parts are measured during or after processing, the measurement accuracy is directly affected by the measurement method, measuring tool accuracy, workpiece and subjective and objective factors.
Tool error: any tool in the cutting process will inevitably produce wear, and resulting in changes in the size and shape of the workpiece.
Fixture error: the role of the fixture is to make the workpiece equivalent to the tool and machine tool have the correct position, so the geometric error of the fixture has a great impact on the machining error (especially the position error)
Machine tool error: including spindle rotation error, guide error and transmission chain error. Spindle rotation error refers to the variation of the actual axis of rotation relative to the average axis of rotation at each moment of the spindle, which will directly affect the accuracy of the workpiece to be processed.