News - Shenzhen Perfect Precision Product Co., Ltd. of page 250

Advantages and disadvantages of NC machining?

advantage: (1) Greatly reduce the number of tooling, machining parts with complex shapes does not need complex tooling. If you want to change the shape and size of parts, you only need to modify the part processing program, which is applicable to the development and modification of new products. (2) The processing quality is stable, the processing accuracy is high, and the repetition accuracy is high, which meets the processing requirements of aircraft. (3) In the case of multi variety and small batch production, the production efficiency is higher, which can reduce the time of production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of cutting quantity. (4) It can process complex surfaces that are difficult to be processed by conventional methods, and even process some unobservable machining parts. Disadvantages: machine tools and equipment are expensive, and maintenance personnel are required to have a high level.

2022

07/18

What are the parts suitable for NC machining?

1. Parts produced in multiple varieties, single piece and small batch or parts in trial production of new products. 2. Parts with complex geometry; 3. Parts requiring high accuracy and surface roughness; 4. Parts requiring multi process processing during processing. 5. Parts that require expensive tooling equipment (such as tools, fixtures and molds) when processed with ordinary machine tools.

2022

07/18

Compared with traditional machining methods, what are the characteristics of CNC machining?

1. NC machining can process workpieces with complex surfaces On CNC machine tools, the shape of the processed parts mainly depends on the processing program, and very complex workpieces can be processed. 2. CNC machining has high precision and stable quality The accuracy of the CNC machine tool itself is higher than that of the ordinary machine tool. The positioning accuracy of the general CNC machine tool is 0.01 mm, and the repeated positioning accuracy is 0.005 mm: moreover, in the processing process of the CNC machine tool, the operator does not participate, so the human error of the operator is eliminated, and the processing degree of the workpiece is guaranteed by the CNC machine tool. Because the CNC processing adopts the centralized process, the impact of multiple clamping of the workpiece on the processing degree is reduced • based on the above points, CNC machining workpiece has high precision, good dimensional consistency and stable quality. 3. High productivity of numerical control processing NC machining can effectively reduce the processing time and auxiliary time of parts. Because the spindle speed and feed speed of the NC machine tool are fast and fast, the machining time of parts can be reduced by reasonably selecting the cutting parameters and giving full play to the cutting performance of the tool • in addition • NC machining generally adopts general-purpose or combined fixtures, so there is no need to scribe before NC machining, and automatic tool change can be carried out in the machining process, which reduces the auxiliary time. 4. NC machining improves working conditions The main tasks of those who are engaged in processing on CNC machine tools are to write programs, input programs, load and unload parts, prepare cutting tools, observe the processing state, and inspect parts, so the labor intensity is greatly reduced. In addition, CNC machine tools are generally closed processing, clean and safe, which improves the working conditions. 5. Numerical control processing is conducive to the modernization of production management 6. NC machining is the foundation of advanced manufacturing technology.

2022

07/18

Characteristics of rubber products

1. When rubber products are formed, they cannot be XC due to the cohesion of elastomer after being pressed under high pressure. When they are formed and removed from the mold, they often produce unstable shrinkage (the shrinkage rate of rubber varies with the type of rubber), which can be gentle and stable after a period of time. Therefore, at the beginning of the design of a rubber product, regardless of the formula or mold, it is necessary to carefully calculate the coordination. If not, it is easy to produce unstable product size and low product quality. 2. Rubber is a thermosetting elastomer, while plastic is a thermosetting elastomer. Due to different types and main bodies of sulfides, there is a considerable gap in the temperature range of rubber molding and curing, and it can even be affected by climate change and indoor temperature and humidity. Therefore, the production conditions of rubber products need to be adjusted appropriately at any time. If not, there may be differences in product quality. 3. Rubber products are made from rubber raw materials after internal mixer mixing. When mixing, the formula is designed according to the characteristics of the required rubber products, and the required product hardness is set. The production and molding of the product is molded by the rubber flat vulcanizing machine. After the product is formed, the flash treatment is carried out, and the surface of the product is treated smooth without burrs. 4. The aging test of rubber products belongs to the aging test category. Rubber aging refers to the phenomenon that the performance and structure of rubber and products are changed due to the comprehensive effect of internal and external factors in the process of processing, storage and use, and then lose the use value. It shows cracking, tackiness, hardening, chalking, discoloration, mildew, etc.

2022

07/01

Three machining methods of boring

1. Boring on lathes with workpiece rotating and cutting tool feeding motion mostly belongs to this boring method. The process features are: after machining, the axis line of the hole is consistent with the rotation axis of the workpiece, the roundness of the hole mainly depends on the rotation accuracy of the machine tool spindle, and the axial geometric error of the hole mainly depends on the position accuracy of the tool feed direction relative to the rotation axis of the workpiece. This boring method is suitable for machining holes with coaxiality requirements with the cylindrical surface. 2. When the tool rotates, the workpiece makes feed motion. The boring machine spindle drives the boring tool to rotate, and the worktable drives the workpiece to make feed motion. 3. The tool rotates and makes feeding motion. This boring method is adopted for boring. The overhang length of the boring bar is variable, and the force deformation of the boring bar is also variable. The aperture near the spindle box is large, and the aperture away from the spindle box is small, forming a conical hole. In addition, with the increase of the hanging length of the boring bar, the bending deformation of the main shaft caused by its own weight will also increase, and the axis of the machined hole will produce corresponding bending. This boring method is only suitable for machining shorter holes.

2022

07/01

How to choose the right tool when processing aluminum

Due to the special characteristics of aluminum, no matter what machine tool is used, the efficiency, service life and workpiece gloss are often unsatisfactory. Therefore, how to choose the appropriate cutting tools and processing technology when processing aluminum has become a matter of concern. Let's first understand the processing characteristics of lower aluminum and aluminum alloy: aluminum has low strength, low hardness and high plasticity, which is suitable for plastic forming processing, but it tends to be deformed and strengthened during cutting, and it is easy to stick the knife, so it is difficult to process a smooth surface. Compared with pure aluminum, aluminum alloy has much higher strength and hardness, but compared with steel, it has low strength and hardness, small cutting force and good thermal conductivity. Due to the soft nature and large plasticity of aluminum alloy, it is easy to stick to the tool during cutting, forming chip nodules on the tool. During high-speed cutting, fusion welding may occur on the blade, causing the tool to lose its cutting ability and affecting the machining accuracy and surface roughness. In addition, the thermal expansion coefficient of aluminum alloy is large, and the cutting heat is easy to cause the thermal deformation of the workpiece and reduce the machining accuracy.

2022

07/01

Cutting conditions of difficult to machine materials

The cutting conditions of difficult to machine materials have always been set relatively low. With the improvement of tool performance, the emergence of high-speed and high-precision CNC machine tools, and the introduction of high-speed milling methods, at present, the cutting of difficult to machine materials has entered the period of high-speed machining and long-life tools. Now, the machining method of using small cutting depth to reduce the load on the cutting edge of the tool, so as to improve the cutting speed and feed speed, has become the best way to cut difficult to machine materials. Of course, it is also very important to choose tool materials and tool geometry that adapt to the unique properties of difficult to machine materials, and we should strive to optimize the cutting path of the tool. For example, when drilling stainless steel and other materials, due to the low thermal conductivity of the material, it is necessary to prevent a large amount of cutting heat from staying on the cutting edge. Therefore, discontinuous cutting should be used as far as possible to avoid friction and heat generation between the cutting edge and the cutting surface, which will help to prolong the tool life and ensure the stability of cutting. When rough machining difficult materials with ball end milling cutter, the tool shape and fixture should be well matched, which can improve the swing accuracy and clamping rigidity of the cutting part of the tool, so as to ensure that the feed rate per tooth is maximized under the condition of high-speed rotation, and at the same time, it can also extend the service life of the tool.

2022

07/01

Problems needing attention in machining difficult materials

Cutting is roughly divided into turning, milling and cutting based on Center teeth (end face cutting of drill bits and end mills, etc.), and the cutting heat of these cutting processes also has different effects on the tip. Turning is a continuous cutting, the cutting force borne by the tip has no obvious change, and the cutting heat acts on the cutting edge continuously; Milling is an intermittent cutting. The cutting force acts on the tip intermittently, and vibration will occur during cutting. The thermal effect on the tip is that the heating during cutting and the cooling during non cutting are carried out alternately, and the total heat is less than that during turning. The cutting heat during milling is an intermittent heating phenomenon, and the cutter teeth are cooled when not cutting, which will be conducive to the extension of tool life. The Japanese Institute of physics and chemistry has made a comparative test on the tool life of turning and milling. The cutting tools used for milling are ball end mills and turning are general turning tools. The cutting comparative tests are carried out under the same processed materials and cutting conditions (due to different cutting methods, the cutting depth, feed rate, cutting speed, etc. can only be roughly the same) and the same environmental conditions. The results show that milling is more beneficial to extending the tool life. When cutting with tools such as drills and ball end mills with central edges (i.e. parts with cutting speed =0m/min), the tool life near the central edge is often low, but it is still stronger than that during turning. When cutting difficult to machine materials, the cutting edge is greatly affected by heat, which often reduces the tool life. If the cutting method is milling, the tool life will be relatively long. However, difficult to machine materials cannot be milled all the time, and there will always be times when turning or drilling processing is required. Therefore, corresponding technical measures should be taken for different cutting methods to improve processing efficiency.

2022

07/01

How to define precision machining

7s words believes that the definition of precision machining is to complete the final processing of main surfaces according to steps and procedures, including workpiece parallelism, surface finish, surface perpendicularity, surface hardness, etc., so that the processing accuracy and surface quality of parts can meet the requirements of the drawing. 1. Parallelism requirements The so-called parallelism requirement is to require the tolerance around the workpiece. For example, for a rectangular workpiece, the thickness of the four corners of the workpiece is required to reach a certain tolerance range. If the thickness of the four sides cannot meet the tolerance requirements, the parallelism requirements cannot be met. This requires readjusting the workpiece. The problem may occur in the suction cup of the grinder. The suction cup is worn due to excessive use, resulting in parallelism errors; It may also be that the grinding wheel is not repaired well, or the grinding wheel has cracks and gaps. At this time, it is necessary to regrind the grinding wheel; It may also be that the suction cup is not cleaned, so it is necessary to clean the suction cup again and carefully; It may also be that the workpiece is not trimmed well and burrs appear. 2. Verticality requirements The so-called perpendicularity requirement is to require the side and ground of the workpiece to meet the tolerance requirements. The best understanding is the proper body. From the number axis, it is divided into XYZ three sides. Generally, XZ and YZ are required to meet the tolerance requirements. The error is also roughly consistent with the requirements of parallelism. Generally, it can be handled according to the requirements of parallelism. 3. Other requirements For example, finish. It is required to achieve, such as mirror effect, etc.

2022

07/01

Factors affecting machining accuracy of precision parts

As we all know, the reason why the machining of precision parts is called precision machining is that its machining process and process requirements are very high, and the precision requirements for products are very high. The machining precision of precision parts includes the precision of position, size and shape. The following are the factors that affect the machining precision of precision parts: (1) The spindle rotation runout of the machine tool can produce a certain error to the machining accuracy of the parts. (2) The inaccuracy of machine tool guide rail can also lead to the error of workpiece shape in precision parts processing. (3) Transmission parts can also cause workpiece machining errors, which is also the main factor of workpiece surface errors. (4) Different types of cutting tools and fixtures will also have different degrees of impact on the accuracy of the workpiece. (5) In the process of machining and cutting, the change of the position of the force point will lead to the deformation of the system, resulting in differences, and can also cause varying degrees of error in the accuracy of the workpiece. (6) The different cutting force will also affect the workpiece accuracy. (7) The error caused by thermal deformation of the process system. During machining, the process system will produce certain thermal deformation under the action of various heat sources. (7) The deformation caused by the heating of the process system often affects the accuracy of the workpiece. (8) Deformation of the machine tool due to heating will cause deformation of the workpiece. (9) Tool deformation due to heating will have a great impact on the workpiece. (10) The workpiece itself is deformed by heating, which is mainly caused by heating in the cutting process.

2022

06/30

China Shenzhen Perfect Precision Product Co., Ltd. company news

Advantages and disadvantages of NC machining?

What are the parts suitable for NC machining?

Compared with traditional machining methods, what are the characteristics of CNC machining?

Characteristics of rubber products

Three machining methods of boring

How to choose the right tool when processing aluminum

Cutting conditions of difficult to machine materials

Problems needing attention in machining difficult materials

How to define precision machining

Factors affecting machining accuracy of precision parts

CNC Turning Parts

CNC Milling Parts

CNC Turning Milling Parts

CNC Machined Aluminum Parts

CNC Stainless Steel Parts

Machining Plastic Parts

CNC Brass Parts