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Causes of chromium plating rust on 45 steel

45 ᦇ why will steel rust after chrome plating? In fact, steel chrome plating will not rust, if there is rust, there must be a reason, let’s take a look

In the process of machining mechanical parts, there are several reasons for parts to rust after chrome plating,

If the parts are not thrown to the position during chrome plating, the chrome plating chemical solution can not hold the surface of the parts, and it will rust after a period of use;
The time for mechanical parts to be put in the liquid medicine is not enough, so that the chromium plating layer on the surface is thin, and the surface will rust in the process of mechanical parts assembly;
When the surface is treated with chromium plating, the temperature of the liquid medicine is not enough to make the machined parts fail to meet the treatment requirements, and it will be easy to rust later! This is also caused by incorrect surface treatment and process of chromium plating.

The above is the reason why the chromium plating treatment of 45 steel will rust. Thank you for sharing!

ken. tang@chengcg.com

CNC machining inspection process

High quality comes from exquisite technology! Before the precision CNC machining of general mechanical parts and automatic equipment accessories, we must see clearly the contents of the machining process card, the parts to be machined, the shapes, the dimensions of the drawings, and the processing contents of the next process. It is also the self checking process of precision machining!

Attention should also be paid to the self inspection of precision CNC machining: before the workpiece is clamped, the blank size should be measured to see if it meets the requirements of the drawing. When the workpiece is clamped, it must be carefully checked whether its placement is consistent with the programming operation instruction; After rough machining, self inspection should be carried out in time to adjust the data with errors in time. The main content of self inspection is the position and size of the processing part.

Whether the machined parts are loose or not; Whether the workpiece is correctly divided into parts; Whether the dimension from the machining part to the datum edge (datum point) of precision CNC machining meets the drawing requirements; The position and size of machining parts. After checking the position and size, measure the rough machined shape ruler (except arc). These are the basic contents of self inspection!

Many years of precision CNC processing factory conclusion, after rough machining self-test before finishing. After finishing, the workers should check the shape and size of the processing parts: check the basic length and width of the processing parts on the vertical plane; Measure the base point size marked on the drawing for the machining part of the inclined plane. The operator can remove the workpiece and send it to the inspector for special inspection after completing the self inspection of the workpiece and confirming that it conforms to the drawing and process requirements.

The above is about the self inspection process of precision CNC machining manufacturers. Thank you for sharing!

ken. tang@chengcg.com

Classification of CNC lathe processing

In the field of machining, the raw materials are clamped for rotary motion, and the turning tool is used for radial or axial machining, which is called lathe machining. In the field of hardware mechanical parts processing industry, lathe processing equipment is classified as: automatic lathe, ordinary lathe, numerical control lathe and instrument lathe. For different mechanical parts processing, hardware parts processing and other requirements, the selection of suitable processing equipment can reflect the unique advantages of the equipment!

Lathe processing equipment such as automatic lathe: the main object of batch hardware parts processing, no special precision requirements; Ordinary lathe: for automatic mechanical equipment parts shaft, rod, non-standard screw processing, suitable for single or small batch parts processing; CNC lathe: for batch hardware mechanical parts processing, high precision is guaranteed; Instrument lathe: mainly for micro mechanical parts processing, on the ordinary desktop can operate.

The general understanding of hardware refers to the combination of gold, silver, copper, iron and tin; Hardware mainly includes coated plate (such as white iron sheet), coated wire (such as iron wire), various small standard parts (such as fastening screws), non-standard parts (such as wood screws) and various small tools (such as screwdrivers); Hardware generally refers to metal plate, pipe, profile, bar and wire.

The above is the classification of lathe machining, thank you for your attention!

ken. tang@chengcg.com

Difficulties and methods of CNC machining

In the field of machining, different parts of the processing complexity, need to choose different processing technology to complete. In the process of precision CNC machining, we will encounter various parts processing, some parts are complex, we need to find the appropriate processing technology, which is often said to be the best way. Let’s take a look at the methods and difficulties in the process of precision CNC machining?

The first is precision CNC machining method, which includes cutting, abrasive machining, non-traditional machining and compound machining; According to the mechanism and characteristics of machining methods, it can be divided into three categories: removal machining, combination machining and deformation machining. At present, the traditional machining methods represented by cutting, grinding and polishing still occupy the main position.

The third is the difficulty: in the process of precision CNC machining,

① Ultra micro machining is just like cutting discontinuity, so the stress is difficult to remove;

② The stiffness and thermal deformation of the process system are large, which have great influence on the machining accuracy;

③ The micro deformation of tool and workpiece surface is random,

It is difficult to control the precision

① Precision machining mechanism;

② Precision processing equipment;

③ Precision machining tools;

④ Workpiece material;

⑤ Precision measurement and error compensation technology;

⑥ Working environment, conditions, etc.

The above are the methods and difficulties in the process of precision CNC machining!, Thank you for your attention!

ken. tang@chengcg.com

Sandblasting technology of aluminum surface

In the mechanical processing industry, automatic equipment accessories, non-standard equipment accessories, aluminum processing parts often do different surface treatment, according to the drawing processing requirements. In the surface treatment processing technology, let’s take a look at the aluminum sandblasting process

Aluminum sandblasting surface treatment is a kind of metal processing material. Compressed air is used as the power to form a high-speed jet beam, and the sandblasting abrasive is sprayed to the surface of the workpiece to be treated at a high speed, so as to change the outer surface or shape of the machined parts. Due to the impact and cutting action of abrasive on the working surface, the surface of machined parts can obtain certain cleanness and different roughness, and the mechanical properties of machined parts can be improved, because it improves the fatigue resistance of machined parts, increases the adhesion between it and coating, prolongs the durability of coating, and is also conducive to the leveling and decoration of coating.

How to control the local sandblasting of aluminum parts? The local sandblasting refers to the process that the parts with precise size or the parts requiring local special decoration do not need sandblasting on the same product, but adopt methods to shield them from sandblasting, so as to provide solutions for local sandblasting protection.

ken. tang@chengcg.com

The influence of surface treatment on the precision of parts

In the mechanical parts processing industry, many parts choose different surface treatment methods according to different processing technology. Does the surface treatment process affect the accuracy of parts? Let’s see

In the process of mechanical parts processing, the common surface treatment processes of metal materials are: Aluminum natural color oxidation, black oxidation, sandblasting, nickel plating, hard white, bluing and other different coloring. The general steel surface treatment processes are: blackening, chromium plating, zinc plating (black zinc), etc. according to the different surface processing processes of drawings, different treatment processes are selected. When the precision of precision parts is high and the surface treatment process affects the precision, the appropriate processing quantity of parts should be reserved first.

General steel surface treatment process chromium plating, zinc plating and blackening will not affect the overall dimensions of the parts. In case of aluminum blackening and oxidation, it will have more or less impact on the required precision holes. There is a special way to control the hole size accuracy during the treatment. Therefore, the surface treatment process has a certain impact on the accuracy of parts, which can be controlled in the process of processing or treatment.

The above is whether the surface treatment process has an impact on the accuracy of parts, thank you for sharing!

ken. tang@chengcg.com

How to process stainless steel small hole by CNC

In the automation equipment, non-standard equipment manufacturing industry, equipment parts are often replaced by stainless steel materials. Compared with general materials, the processing technology of stainless steel materials is more complicated. How to process small holes in stainless steel parts is actually not difficult; With the continuous development of economy and technology, the diversity of processing materials of various enterprises is also changing and increasing. In order to help you solve some problems in the work, the following summarizes some skills of how to process small holes of stainless steel parts?

In the field of mechanical processing, first of all, the design of process route and the selection of processing tools: according to the actual situation of stainless steel parts small hole to be processed, the following process route can be formulated: rough turning inner shape – semi finishing turning inner shape – finishing turning inner shape – finishing turning inner hole annular groove – turning end surface groove. The selection of cutting tools should be based on the characteristics of stainless steel itself and comprehensive consideration from all aspects. It includes the following points

In order to avoid the phenomenon of workpiece falling off, it is necessary to choose the right-hand tool which is opposite to the thread of thread mould.
We should try our best to choose the tool shape and cutting groove shape (not smooth) with the smallest cutting force, so as to reduce the impact on the rigidity of parts.
The arc of the tip should be moderate. If the arc is too large, chattering lines will appear; If the arc is too small, the tool tip is easy to be damaged, which affects the service life of the tool.
In the selection of the tool holder, we should choose the form of internal cooling, so that the parts will be fully cooled in the process of processing, and at the same time, we should control the direction of chip removal.

Small hole machining control of stainless steel parts: due to the structure of mechanical parts, the positioning mode of thread mould can only be used for clamping in the internal turning. For the special requirements of workpiece processing, if the center of gravity is irregular, it is easy to be out of balance in the clamping system. At the same time, there are high requirements for dimensional accuracy, coaxiality and perpendicularity. If there is a little error in the process of processing, it may have a serious impact on the practical performance of the parts.

So for the stainless steel parts small hole processing to the tool selection, cutting parameters and process route setting must have strict requirements, these factors will affect the parts after processing is qualified. Machining accuracy of machining equipment itself is also very important!

The above is how to process the small hole of stainless steel precision parts. Thank you for your attention!

ken. tang@chengcg.com

CNC machining materials suitable for surface drawing

The process of making raw materials into mechanical parts by processing equipment is called mechanical parts processing, and the process is called machining process. In the field of mechanical processing, the materials of automatic equipment accessories and hardware mechanical parts are different, or the processing requirements are different, which directly affects the selection of processing technology and processing equipment. In the surface treatment of mechanical equipment parts is the same, different raw materials need to choose a reasonable treatment process. Let’s take a look at the mechanical parts processing industry, what materials are suitable for surface drawing treatment

In the mechanical parts processing industry, there are many raw materials processing, such as steel: Cr12, S45C, Q235, s316, etc., plastic: POM saigang, bakelite, ESD, peek, etc., aluminum: aluminum profile, al5052, Al6061, imported al7075, etc., stainless steel: sus303, SUS304, etc., and many raw materials. Used in the automation equipment parts, plastic materials generally do not require surface drawing treatment. Most of them are aluminum and stainless steel. If there are no special requirements for the surface, the surface drawing treatment will be selected. The main drawing effect is beautiful, so that the surface looks good.

The above is in the mechanical parts processing industry, what material is suitable for surface drawing treatment to share.

ken. tang@chengcg.com

Introduction of CNC milling machine

In the machining process, because different industries have different machining needs, they often come into contact with electronic equipment parts processing, mechanical parts processing, etc; The so-called machining refers to the degree that the actual value of the geometric parameters (size, shape and mutual position) of the workpiece after machining conforms to the ideal value. The higher the machining process is, the higher the dimensional accuracy will be, otherwise, the lower the accuracy will be. The higher the machining error, the lower the accuracy.

In the field of mechanical processing, ordinary machine tools include lathe processing, grinder processing and milling machine processing; Milling machine is independently operated by technicians, with X, y and Z axes. There is a worktable on the machine tool, which mainly processes simple workpieces, holes, steps, etc., and relatively simple mechanical parts processing, generally single or several pieces. In case of high machining precision and small batch processing, it is necessary to select reasonable processing equipment, such as CNC machining center. Milling machine is mainly used for cutting, rough machining and single piece machining. Need to have a certain accuracy of mechanical parts processing, then the experience of operating technicians is also very important!

The above is the understanding of milling machine processing of machining process.

ken. tang@chengcg.com

Division of CNC production process

In the field of machining, CNC machining center belongs to precision machining equipment. When dividing the production and processing technology of parts, we must understand the structure and technology of machining parts, the function of CNC machining center, the number of parts processing steps, the number of installation times and the production organization status of machining plant. According to the accuracy requirements of processing parts, reasonable selection of production process division (processing technology). Let’s take a look at the following introduction of parts flow division:

In CNC machining process, the centralized sorting method of cutting tools: it refers to the cutting tools dividing the working procedures, using the same cutting tool to process all the parts that can be completed. With the second knife and the third, they can complete other parts. This can reduce the number of tool change, compress the idle time and reduce unnecessary positioning error. So as to improve the efficiency of production and processing!

Thirdly, it is based on the part sorting method: for the mechanical parts with a lot of processing content, the CNC processing part can be divided into several parts according to its structural characteristics, such as steps, shape, surface or plane, etc. Generally, the plane and positioning surface are machined first, and then the hole is machined; First the simple geometry is processed, then the complex geometry is processed; The parts with lower precision should be processed first, and then the parts with higher precision should be processed. The processing steps must be clear.

Machining is generally divided into rough machining and finish machining, here is also the rough and finish machining sequence method: for parts prone to machining deformation, due to the deformation that may occur after CNC rough machining, it is necessary to carry out shape correction, so generally speaking, all the processes that need to be rough and finish machining should be separated. Ensure machining accuracy, improve production quality!

The above is the production process division of CNC machining center.

ken. tang@chengcg.com

Author Archive chengcg

Causes of chromium plating rust on 45 steel

CNC machining inspection process

Classification of CNC lathe processing

Difficulties and methods of CNC machining

Sandblasting technology of aluminum surface

The influence of surface treatment on the precision of parts

How to process stainless steel small hole by CNC

CNC machining materials suitable for surface drawing

Introduction of CNC milling machine

Division of CNC production process

CNC Machining parts

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