chengcg – Page 113 – CNC Machining & Turning, Milling, Metal parts

Function characteristics of LED solid crystal machine

1. One machine is applicable to all kinds of LED solid crystal operation

2. Quick change products

3. Double vision positioning system, high crystallizing accuracy

4. Super large material carrier 4 “X8” double slot

5. Standard humanized windows interface design

6. Chinese operation interface, high affinity for operation setting

7. Modular automatic teaching, simple and fast setting

8. Point by point or two-point production diversification

9. The whole plate of support is loaded and unloaded, and the fixture only needs to be replaced for different products

Those materials are generally used in block rules

The manufacturing of each piece of block gauge will directly affect the stability of size. Therefore, the material should be carefully considered when manufacturing or purchasing the block gauge. Here are some important characteristics for reference:

(1) The accuracy requirements of its standard size and surface accuracy shall be above the specification standard.

(2) Do not affect the standard size due to environmental changes.

(3) It shall be wear-resistant and corrosion-resistant.

(4) It needs to be practical, such as shape, size, size, thickness, etc.

There are several kinds of materials for manufacturing block gauge: chromium carbide, tungsten carbide, alloy steel, stainless steel, quartzite, etc. However, most of the manufacturers of block gauge are mainly made of alloy steel and tool steel, and their advantages are summarized as follows:

(1) After hardening, the deformation has wear resistance and stability.

(2) Low price and easy machining.

Precautions for wire cutting

1. Before starting the machine, check whether the electrical parts are loose. If there are broken wires and parts falling off, inform the professional personnel in time for maintenance.

2. Check the tension of molybdenum wire.

3. Check whether the guide wheel is damaged and change the position of the working face in time to prevent the molybdenum wire from being broken.

4. Check if there is a communication slot in the wire stopper, adjust the position of the working face in time to prevent the molybdenum wire from being broken.

5. Check that the lubricating part of the machine tool has enough lubricating oil.

6. Daily maintenance:

6.1. Add No.30 engine oil once per shift for transverse feed gearbox and longitudinal feed gearbox.

6.2. Each drive shaft, screw rod nut and guide plate of the screw storage barrel shall be added with 30 engine oil once for each plate.

Maintenance of CNC lathe

1. Clean and lubricate each guide rail surface every day. For machine tools with automatic lubrication system, regularly check and clean the automatic lubrication system, check the oil volume, add lubricating oil in time, and check whether the oil pump starts and stops regularly.

2. Check whether the automatic lubrication system of the spindle box works normally every day, and change the lubricating oil of the spindle box regularly.

3. Check whether the cooling fan in the electrical cabinet works normally, whether the air duct filter screen is blocked, and clean the dust.

4. Pay attention to check the cooling system, check the liquid level, add oil or water in time, and replace and clean the dirty oil or water.

5. Pay attention to check the main shaft drive belt and adjust the tightness.

6. Pay attention to check the tightness of guide rail insert strip and adjust the clearance.

7. Pay attention to check whether the oil pump in the oil tank of the hydraulic system of the machine tool has abnormal noise, whether the height of the working oil level is appropriate, whether the indication of the pressure gauge is normal, and whether the pipeline and all joints have > leakage.

8. Pay attention to check whether the guide rail and machine tool protective cover are complete and effective.

9. Pay attention to check the mechanical accuracy of all moving parts to reduce the deviation of shape and position.

10. Clean the machine tool, clean the scrap iron and wipe the cooling liquid at the guide rail to prevent the guide rail from rusting

The planning of the processing route of precision parts is to make the overall layout of the process

General principles for drawing up process routes of precision parts

The process planning of precision parts can be divided into two steps. First of all, it is to draw up the process route of parts processing, and then determine the process size of each process, used equipment and process equipment, cutting specifications, working hours quota, etc. These two steps are interrelated and should be analyzed comprehensively.

The main task is to select the processing methods of each surface, determine the machining sequence of each surface, and determine the number of processes in the whole process.

General principles of the proposed process route

1. Machining datum first

In the machining process of parts, the surface used as the positioning reference should be machined first, so as to provide the precision reference for the subsequent processing as soon as possible. It is called “benchmark first”.

2. Division of processing stages

Surfaces with high machining quality requirements are divided into three stages: rough machining, semi finish machining and finish machining. It is mainly to ensure the processing quality, to facilitate the rational use of equipment, to facilitate the arrangement of heat treatment process, and to facilitate the detection of blank defects.

3. Face before hole

For the box, bracket, connecting rod and other parts, the plane shall be machined before the hole is machined. In this way, the hole can be machined by plane positioning, ensuring the position accuracy of plane and hole, and bringing convenience to the machining of hole on plane.

4. Finishing

The finishing of main surfaces (such as grinding, honing, finishing rolling, etc.) shall be placed at the last stage of the process route.

The planning of the processing route of precision parts is to make the overall layout of the process

General principles for drawing up process routes of precision parts

The main task is to select the processing methods of each surface, determine the machining sequence of each surface, and determine the number of processes in the whole process.

General principles of the proposed process route

1. Machining datum first

2. Division of processing stages

3. Face before hole

4. Finishing

The finishing of main surfaces (such as grinding, honing, finishing rolling, etc.) shall be placed at the last stage of the process route.

What is precision part processing technology?

Many people know what precision parts processing, but for the machining process, presumably many people are not very familiar with it. The machining process specification is one of the process documents that stipulate the machining process and operation method of parts. It is a process document which is written in the specified form according to the more reasonable process and operation method under the specific production conditions, and is used to guide production after approval. Machining process specification generally includes the following contents: process route of workpiece processing, specific contents of each process, equipment and process equipment used, inspection items and methods of workpiece, cutting amount, time quota, etc.

Precision parts processing technology is to change the shape, size, relative position and nature of the production object on the basis of the process to make it a finished or semi-finished product. It is a detailed description of each process. For example, as mentioned above, rough machining may include rough manufacturing, grinding, etc., and finish machining may be divided into turning, fitter, milling machine, etc., each step is necessary There are detailed data, such as how much roughness to achieve, how much tolerance to achieve.

According to the quantity of products, equipment conditions and quality of workers, technicians determine the adopted process and write the relevant contents into process documents, which are called process procedures. This is more targeted. Every factory may be different, because the actual situation is different.

Generally speaking, the process flow is the program, the processing technology is the detailed parameter of each step, and the process procedure is a specific processing technology compiled by a factory according to the actual situation.

Reaming process of stainless steel parts

The reaming process of stainless steel parts is as follows:

(1) The reaming of stainless steel material mostly uses carbide reamer. The structure and geometric parameters of reamer are different from those of common reamer. In order to enhance the strength of cutter teeth and prevent chip blocking during reaming, the number of reamer teeth is generally small. The manufacturer of stainless steel parts tells you that the front angle of reamer is generally 8 ° ~ 12 °, but in some special cases, in order to achieve high-speed reaming, the front angle of 0 ° ~ 5 ° can also be used; the back angle is generally 8 ° ~ 12 °; the selection of main deflection angle depends on the different holes, in general, the through hole is 15 ° ~ 30 °, and the through hole is 45 °; in order to make the chips discharged forward, the angle of blade inclination can also be increased properly The angle of blade inclination is generally 10 ° ~ 20 °; the width of blade belt is Zero point one ~ 0.15mm The reverse taper of reamer shall be larger than that of common reamer, and the carbide reamer is generally zero point two five ~ 0.5mm/100mm , high speed steel reamer is Zero point one ~ 0.25mm/100mm The length of reamer correction part is generally 65% ~ 80% of common reamer, and the length of cylinder part is 40% ~ 50% of common reamer.

(2) When selecting the cutting amount, the feed amount is zero point zero eight ~ 0.4mm/r The cutting speed is 10-20 M / min, and the coarse reaming allowance is generally Zero point two ~ 0.3mm The allowance of finish reaming is Zero point one ~ 0.2mm 。 Hard alloy cutter shall be used for coarse reaming and high speed steel cutter shall be used for fine reaming.

(3) The manufacturer of stainless steel parts tells you that when the cutting fluid chooses stainless steel material for reaming, the oil or molybdenum disulfide used in the total loss system can be used as the cooling medium.

Identification skills of stainless steel in processing of stainless steel parts

Stainless steel parts manufacturers tell you that with the development of economy, the use of stainless steel has become more and more extensive. People’s daily life is closely related to stainless steel, but many people do not know enough about the performance of stainless steel and the maintenance of stainless steel. Most people think stainless steel will never rust. In fact, the reason why stainless steel has good corrosion resistance is that a passivation film is formed on its surface, and it exists in a more stable oxide form in nature. That is to say, although stainless steel is oxidized to different degrees according to different service conditions, it is eventually oxidized, which is usually called corrosion.

The manufacturer of stainless steel parts tells you that stainless steel refers to the steel that is resistant to weak corrosive media such as air, steam, water and chemical corrosive media such as acid, alkali and salt, also known as stainless acid resistant steel. Here are some stainless steel identification techniques for your reference.

1. Liquid medicine detection method: at present, there are several chemical liquid medicines used to detect stainless steel on the market. When one drops onto the surface of stainless steel, 201 turns dark brown and 304 turns red.

2. Price estimation method: fully understand the market situation of each steel grade. If the price of the same steel grade varies greatly, we should consider whether it is “Li Gui”.

3. Integrity of traders: enterprises with better integrity will do business in the market. It’s better to select more traders for comparison, which is also the way to prevent “Li Gui”.

4. Contract agreement law: stainless steel parts manufacturers tell you that in the transaction of stainless steel, those with large amount shall sign a good contract, indicating steel type, quantity, material, time, delivery date, responsibility for violating laws and disciplines, etc. In case of material discrepancy, the loss can be recovered through negotiation or law.

Introduction of ultra precision machining and special machining

Cutting of ultra precision parts

The machining of ultra precision parts mainly includes ultra precision turning, mirror grinding and grinding. Micro turning is carried out on ultra precision lathe with a single crystal diamond turning tool which has been finely ground. The cutting thickness is only about 1 μ m. It is commonly used to process high-precision and smooth surface parts such as spherical, aspheric and plane mirrors of non-ferrous materials. For example, the aspherical mirror with a diameter of 800 mm used for processing nuclear fusion device has a maximum accuracy of 0.1 μ m and a surface roughness of rz0.05 μ M.

Special machining of ultra precision parts

When the machining precision of ultra precision parts is nanometer, or even the atomic unit (atomic lattice distance is 0.1-0.2nm), the cutting method of ultra precision parts can not adapt. It needs to use the special precision parts processing method, that is, chemical energy, electrochemical energy, thermal energy or electric energy, to make these energy exceed the combined energy between atoms, so as to remove the surface of the workpiece In order to achieve the purpose of ultra precision machining, some atoms are attached, combined or lattice deformed. These processes include mechanical chemical polishing, ion sputtering and ion implantation, electron beam exposure, laser beam processing, metal evaporation and molecular beam epitaxy.

The feature of these ultra precision parts machining methods is that the amount of material removed or added to the surface layer can be controlled very slightly. However, to obtain the machining accuracy of ultra precision parts, it still depends on the precise machining equipment and precise control system, and the ultra precision mask is used as the intermediary. For example, in VLSI plate making, electron beam is used to expose photoresist (see photolithography) on the mask to make the atoms of photoresist polymerize (or decompose) directly under electron impact, and then developer is used to dissolve the polymerized or unpolymerized parts to make the mask. It is necessary to use the ultra precision machining equipment with the positioning accuracy of ± 0.01 μ M.