News - Shenzhen Perfect Precision Product Co., Ltd. of page 112

Analysis of quality problems arising from strong cutting of multi-head worm gear in precision parts machining?

In the process of precision parts processing turning appeared zapping phenomenon The main reason for the phenomenon of zapping is: the workpiece clamping is not secure and walking, resulting in an increase in cutting volume. In addition, poor flexibility of the turning tool shank, the cutting dosage selection is too large, worm turning tool longitudinal front angle is too large, the cutting fluid is not properly selected or due to the cutting edge of the turning tool grinding dull and the emergence of hardening affects the cutting into, etc., may also cause a tool. Once the tool is tied, light damage to the tool, scrap the workpiece, heavy damage to the machine tool, it should try to prevent Incorrect tooth shape in precision parts machining is mainly in the sharpening and installation of the turning tool. For example, the turning tool tip angle is not corrected; the turning tool tip and the workpiece center is not equal height; the tool tip angle bisector is not perpendicular to the axis of the workpiece; not according to the form of worm when finishing according to the requirements of the correct loading tool. In addition, the wear of the turning tool will also affect the correctness of the tooth shape. Poor surface quality Vibration caused by insufficient rigidity of the toolholder; dull or damaged turning tool; poor rigidity of the workpiece and improper selection of cutting amount; excessive borrowing amount during rough machining and cannot be corrected; insufficient margin in the finishing stage; improper selection of cutting fluid; chip tumor or chip pulling worm tooth side in turning will make the surface quality decline.

2023

02/18

What are the main indexable milling tools for precision parts machining?

There are two series of indexable face mills for precision parts machining. Among them, the series of inserts with back angle is suitable for continuous milling of steel and cast iron parts, cutting lightly and effortlessly, consuming little power, requiring little process system, and a set of inserts with four cutting edges. The series of inserts without back angle are suitable for interrupted cutting of steel and cast iron parts, with high cutting edge strength, and are not easy to chip when processing hard steel and materials with uneven material. Using this type of milling cutter, the accuracy of the milling machine spindle is not high, but requires sufficient power of the machine tool, good rigidity of the process system, a set of inserts with 8 cutting edges, high utilization of the inserts. According to the size of the main deflection angle, there are mainly two forms of 75° and 90°. According to the combination of back front foot (mainly affects the required cutting power) and side front (mainly affects the deformation and direction of chip discharge), it is usually divided into three forms. Double negative front angle type is suitable for rough milling and interrupted cutting; double positive front angle type is suitable for processing aluminum alloys, copper alloys, plastics and composite materials, as well as steel semi-finishing; negative, positive front angle type has the advantages of the first two combinations in, in Shanghai precision parts processing is suitable for processing a variety of carbon steel, alloy steel, tool steel, cast iron and stainless steel, etc., more versatile.

2023

02/18

How to measure the error of roundness in precision parts machining?

The error of roundness in precision parts machining can be checked by the roundness meter method and the two-point three-point method. The roundness meter method involves placing the workpiece to be measured on the roundness meter table, aligning the axis of rotation, and making contact between the roundness meter probe and the outer circle of the workpiece and rotating it. Through the sensor, amplifier, filter, calculation circuit, and finally display the measurement results. If the output is the actual contour of the graphics, available concentric circle template set, the difference between the radius of the two inclusive concentric circles as the roundness error of a cross-section. Roundness meter is suitable for measuring parts with high accuracy requirements. Two-point method and three-point method When the shape of the measured contour is an even number of prismatic circles, available two-point method to measure roundness error. Using calipers, micrometers, micrometers and other measuring instruments, along the entire circumference of the diameter of the cut-off circle to measure the maximum difference, half of its roundness error as the cut-off circle, the calculation formula is: As the largest and smallest diameter of the circle is not necessarily concentric, so this method is only an approximate measurement. When the measured contour for the odd prismatic circle, with two-point method can not measure the roundness error, then available three-point method of measurement. V-frame to support the measured workpiece, with the indicator to measure the maximum difference between the workpiece rotary week, take its general as the circularity error of the section. Commonly used V-frame clamp angle α have 60 °, 72 °, 90 °, 108 ° and 120 °, etc.. The three-point method in precision parts machining can also be used for high-precision measurement.

2023

02/17

What are the requirements for acceptance of CNC lathe processing CNC lathe?

The acceptance of CNC lathe processing CNC lathe should be carried out according to the "Technical Requirements for Manufacturing and Acceptance of CNC Horizontal Lathe" promulgated and implemented by the state, and in the process of acceptance, if disputes occur, they should be resolved through consultation based on the relevant national standards Check the contents of the boxes one by one according to the random packing list and the list of specific accessories in the contract. And make inspection records. Have the following contents. Whether the packing box is intact, the appearance of the machine tool has no obvious damage, is rusted, stripped of paint. The presence or absence of technical information, whether complete. The variety, specifications, quantity of accessories. Spare parts variety, specifications, quantity. Tool varieties, specifications, quantities. Tool (blade) variety, specification, quantity. Installation accessories. Varieties, specifications, quantities of electrical components.

2023

02/17

What is profiling cutting and model making in precision parts machining?

When using profiling to solve milling problems in precision parts machining, the main difficulties to be solved are determining the profiling method, profiling device and model design. Determine the profiling method on the basis of the analysis of the characteristics of the type surface, selected plane profiling and three-dimensional profiling method. The planar profiling method is generally set up on the vertical milling machine with a planar profiling device, through the automatic feeding of the table and the manual or the use of spring force, hammer tension, etc. to drive the sliding motion, so that the workpiece with the model profile profiling movement, so as to mill irregular curves for the linear forming surface of the wire. The three-dimensional profiling method is similar to profiling milling machine, along a direction coordinate movement with the machine tool automatic feed to achieve, the horizontal plane along another coordinate movement by the periodic step feed to achieve, and the vertical motion is driven by the spring force to achieve the slide. The design and production of the imitation device design and production of the imitation device can be seen in the fixture design and improve the design of the relevant chapter content. In the precision parts processing model design and production using three coordinates and other measuring equipment with data output to measure the model surface, after data regression processing, the application of CAD/CAM technology in CNC machine tools milling processing irregular curves, curved surfaces, profiling milling model surface, model design and production can be carried out in cooperation with CNC technicians or CNC operators.

2023

02/17

Shenzhen precision parts processing fixture basic knowledge analysis?

Shenzhen precision parts machining fixture is installed on the machine tool, used to clamp the workpiece or guide the tool, so that the workpiece and the tool have the correct mutual position of the relationship between the device. According to its role and function, CNC machine tool fixtures are usually composed of positioning components, clamping devices, mounting and connecting components and clamps. The positioning element is one of the main positioning elements of the fixture, and its positioning accuracy will directly affect the machining accuracy of the workpiece. Commonly used positioning elements include V-block, positioning pin, positioning block, etc. The function of the clamping device is to maintain the positioning position of the workpiece in the fixture so that the workpiece will not change its original position during machining due to external forces. Coupling elements are used to determine the position of the fixture on the machine tool, so as to ensure the correct processing position between the workpiece and the machine tool. Shenzhen precision parts processing also has certain requirements for its fixtures are: accuracy and rigidity requirements, positioning requirements, openness requirements, fast clamping requirements, easy chip removal. Fixture is the basic part of the fixture, used to connect the various components or equipment on the fixture, so that it becomes a whole, to ensure the accuracy and rigidity of the workpiece.

2023

02/17

CNC lathe processing CNC lathe tool setting use which kinds of ways?

CNC lathe processing CNC lathe is one of the more widely used CNC machine tools. It is mainly used for cutting and processing internal and external cylindrical surface of shaft parts or disk parts, internal and external conical surface of any taper angle, complex rotary internal and external surfaces and cylindrical and conical threads, etc. It can also carry out grooving, drilling, reaming, reaming and boring, etc. Ordinary: often used in practice, manual measurement of the relative position of the CNC lathe, to z-direction tool for example, after loading the tool to move the tool, cut the right end face of the workpiece by hand, and then back out along the x-direction, the processing origin and the right end face distance into the CNC system to complete the cutting tool processing. Chemistry: tool tip detection system to achieve. According to the set speed, the tool edge approaches the contact sensor and sends a signal. In tool setting, the spindle, tool holder and contact sensor are mainly used. Tool setting can be done automatically, which is conducive to improving machining accuracy, and is now also being used on a large scale. External: The essence is to measure the distance between the virtual tool point and the table reference point in X and Z directions. The use of external machine tool auxiliary role in off-campus machine tools, to create good conditions for subsequent processing production. In practice, after loading the CNC lathe, the corresponding compensation number is input to the tool length at any time to meet the needs of workpiece processing and production, laying the foundation for the subsequent work to proceed smoothly.

2023

02/17

Find out what is the treatment method for the appearance of cnc machined parts?

The processing method of the appearance of the cnc machining parts depends first of all on the technical requirements of the machined appearance. But it should be noted that these technical requirements are not necessarily the requirements of the rules of the parts, and sometimes may be higher than the requirements of the parts in some respects due to the process. For example, due to the benchmark does not overlap and progress on some cnc machining parts appearance of the processing requirements. When you understand the technical requirements of the appearance of the cnc machining parts, you can choose the Z final processing method to ensure the request, and to determine the need for several steps and the processing method of each step. The selected CNC machining method, should meet the quality of the parts, good processing economy and high consumption efficiency of the request. To this end, the selection of processing methods should consider the following elements any CNC machining method can achieve the machining accuracy and appearance roughness have a considerable range, but as long as a narrow range is economic, this range of machining accuracy is the economic machining accuracy. For this reason, in the selection of processing methods, should choose the corresponding economic machining accuracy of the processing methods to consider the nature of CNC machining parts material. To think about the structure of the CNC machining parts shape and size. To consider the consumption rate and economic requirements. Mass consumption, should be used in a large number of high-efficiency advanced technology. So much so that it can basically change the manufacturing method of the blank, can reduce the amount of mechanical processing labor.

2023

02/17

Learn what difficult issues arise when machining stainless steel precision parts?

When processing stainless steel precision parts, we have to be fast, accurate and precise, but we will encounter difficulties in processing, the following stainless steel precision parts processing Xiaobian will talk to you about it! Because of the quality of food resistance, forming, suitability and a wide range of temperature range of the strong toughening characteristics, so in heavy industry, light industry, household goods industry and building decoration industry is widely used. Alloy steel with chromium content greater than 12% or nickel content greater than 8% is called stainless steel. This steel has a certain degree of corrosion resistance in the atmosphere or corrosive media, and has high strength at higher temperatures (> 450 ℃). Chromium content of 16% to 18% of the steel is called acid-resistant steel or acid-resistant stainless steel, commonly known as stainless steel. Due to the above characteristics of stainless steel, it is increasingly widely used in aviation, aerospace, chemical, petroleum, construction, food and other industrial sectors and in daily life. The following difficulties are encountered in the processing of stainless steel. Machining hardening is serious: stainless steel plasticity, plastic deformation when the trait distortion, strengthening coefficient; in addition, austenite is not stable enough, part of the austenite in the cutting stress can be transformed into martensite; in addition, composite impurities in the cutting heat under the action of easy decomposition and dispersion, resulting in the cutting process of hardening layer. The previous feed or the previous process caused by the machining hardening phenomenon seriously affects the smooth progress of subsequent processes. Cutting force is large: stainless steel in the cutting process has a large plastic deformation, resulting in increased cutting force. Stainless steel has severe work hardening and high thermal strength, which further increases the cutting resistance, and difficult to curl and break the chip. High cutting temperature: cutting plastic deformation, and tool friction, cutting heat; a large amount of cutting heat is concentrated in the cutting area and tool-chip contact interface, poor heat dissipation conditions.

2023

02/17

CNC lathe machining factory in the process of CNC lathe tool change how to deal with a stuck tool?

In simple terms, there are two kinds of situations in which a CNC lathe machining factory has a stuck tool in the process of tool change, one is that the tool is not pulled down, and the other is that the tool has been pulled down, the first situation is relatively good to solve, we mainly introduce the solution of the 2nd situation. 1）Loosen the brake device on the motor, use the movable wrench to rotate the outer hex on the motor, generally the direction of rotation is the same as the direction of the jamming of the tool arm, in short, let the tool arm of the automatic tool change detach from the spindle of the high-speed vertical machining center. 2）When the tool arm of CNC lathe is detached from the spindle, if there is a tool on the spindle you can hear the sound of air leakage, that is, the spindle is in the state when the knife is loose, this is to pay attention to, - must be in the work pad a thing, the tool at this time there is the occurrence of falling situation. 3) Please keep rotating the tool arm until the tool arm has done a complete tool change action. The tool arm also has a home position, in the tool magazine panel, there are three red lights inside, generally the middle one is the light is the tool arm in the home position of the light. (4) After troubleshooting, set the tool arm motor brake back to the original position, and then carry out the tool change action when the CNC lathe is in MDI state to see if it is normal, if it is normal, please remember to check all the knives to be used for processing once, and carry out processing under the condition of ensuring safety.

2023

02/17

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

Analysis of quality problems arising from strong cutting of multi-head worm gear in precision parts machining?

What are the main indexable milling tools for precision parts machining?

How to measure the error of roundness in precision parts machining?

What are the requirements for acceptance of CNC lathe processing CNC lathe?

What is profiling cutting and model making in precision parts machining?

Shenzhen precision parts processing fixture basic knowledge analysis?

CNC lathe processing CNC lathe tool setting use which kinds of ways?

Find out what is the treatment method for the appearance of cnc machined parts?

Learn what difficult issues arise when machining stainless steel precision parts?

CNC lathe machining factory in the process of CNC lathe tool change how to deal with a stuck tool?

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