chengcg – Page 133 – CNC Machining & Turning, Milling, Metal parts

Knowledge of CNC turning and milling machining

Composite machining is one of the processing technologies in the field of machining. It is an advanced manufacturing technology. Compound machining is to realize several different machining processes on one machine tool. Compound machining is the most widely used and most difficult, which is turning milling compound machining. Turning milling compound machining center is equivalent to the compound of a CNC lathe and a machining center.

brief introduction

Turning and milling compound machine tool is the fastest developing and most widely used numerical control equipment in compound machine tool. Machine tool compounding is one of the important directions of machine tool development. The compound machine tool also includes turning milling compound, turning milling compound, milling compound, cutting and 3D printing compound, cutting and ultrasonic vibration compound, laser and stamping compound and other various forms. The compound purpose is to make a machine tool have multi-function, can complete multi tasks at a time, improve processing efficiency and processing accuracy

advantage

Compared with the conventional NC machining process, the outstanding advantages of composite machining are mainly shown in the following aspects.

(1) Shorten product manufacturing process chain and improve production efficiency. Turning milling compound machining can complete all or most of the processing procedures by one-time loading, thus greatly shortening the product manufacturing process chain. On the one hand, it can reduce the auxiliary production time caused by the change of fixture, and reduce the manufacturing cycle and waiting time of fixture, which can significantly improve the production efficiency.

(3) Reduce floor space and production cost. Although the price of a single turning milling complex processing equipment is relatively high, due to the shortening of manufacturing process chain and the reduction of equipment required for products, as well as the reduction of the number of tooling and fixtures, the floor area of workshop and equipment maintenance costs, it can effectively reduce the investment, production operation and management costs of the overall fixed assets.

Characteristic

1. The turning milling compound machining center uses high-precision internal spindle;

2. The free mobile operation panel improves the working efficiency;

3. The machine is mainly used for mass production of various small parts and complex parts with high-speed processing and diversified processing;

4. In particular, the long and thin complex process can be processed and formed at one time, and the automatic feeding device can be configured to improve the efficiency;

5. Material details: cutting, copper, iron, aluminum alloy, stainless steel, Teflon and other materials.

Development status

Most of the turning and milling complex machining is completed in the turning center, while the general turning center only changes the ordinary turret tool rest of the CNC lathe into the turret tool rest with the power tool, and the spindle adds the c-axis function. Due to the limitation of turret structure and dimension, the power of the power head is small, the rotating speed is not high, and the larger tool can not be installed. This kind of turning center is mainly for turning, milling and drilling functions are only for some auxiliary processing. Because of the high cost of power tool holder, the cost of turning center remains high. The price of domestic tool holder is generally more than 100000 yuan, and that of imported tool holder is more than 200000 yuan, which can not be afforded by general users. Most of the economical turn milling composites are XZC axis, that is, a rotating C axis is added to the chuck to realize the basic milling function.

There are many kinds of equipment in the market, such as WFL, DMG, Dalian machine tool, Taiwan Taiyu precision machine, Doosan (Doosan machine tool), all of which have high-end equipment; the well-known software of the market is Edgecam, UG NX, etc.

Machining of CNC turning and milling composite parts

In order to improve the machining efficiency and accuracy of complex special-shaped products, technologists have been seeking for efficient and precise machining methods. The appearance of turn milling compound machining equipment provides an effective solution for improving the machining accuracy and efficiency of aerospace parts.

Machining efficiency and precision is the eternal goal in the field of metal processing. With the continuous development of numerical control technology, computer technology, machine tool technology and processing technology, the traditional processing concept can not meet the requirements of processing speed, efficiency and accuracy. In this context, composite machining technology came into being. Generally speaking, composite processing refers to the general term of processing technology that can complete different processes or different process methods on a single processing equipment. There are two different types of compound processing technology, one is the combination of different processing methods based on energy or motion mode; the other is the combination based on the principle of process concentration and mechanical processing technology. Turning milling compound processing is one of the processing methods that have developed rapidly in recent years.

Aviation product parts are characterized by many varieties, small batch, complex process, and widely used as a whole thin-walled structure and difficult to process materials. Therefore, there are many bottlenecks in the manufacturing process, such as long manufacturing cycle, large amount of material removal, low processing efficiency and serious processing deformation. In order to improve the machining efficiency and accuracy of aviation complex products, technologists have been seeking more efficient and precise machining methods. The appearance of turn milling compound machining equipment provides an effective solution for improving the machining accuracy and efficiency of aviation parts.

Meaning

Turning and milling is an advanced cutting method which uses the combined movement of milling cutter rotation and workpiece rotation to realize the cutting of workpiece and make the workpiece meet the requirements in many aspects such as shape accuracy, position accuracy, machined surface integrity, etc. Turning milling compound machining is not only a combination of turning and milling methods into a machine tool, but also a new cutting theory and technology under the condition of great development of CNC technology.

advantage

Compared with the conventional NC machining process, the outstanding advantages of turning milling composite machining mainly lie in the following aspects:

(1) Shorten product manufacturing process chain and improve production efficiency. A variety of special cutters can be installed, new cutter arrangement can reduce tool change time, improve processing efficiency, turn milling compound processing can achieve one-time clamping to complete all or most of the processing procedures, thus greatly shortening the product manufacturing process chain. On the one hand, it can reduce the auxiliary production time caused by the change of fixture, and reduce the manufacturing cycle and waiting time of fixture, which can significantly improve the production efficiency.

(2) Reduce clamping times and improve machining accuracy. The reduction of the loading times avoids the error accumulation caused by the transformation of the positioning datum. At the same time, most of the turning milling complex processing equipment has the function of on-line detection, which can realize the on-site detection and precision control of key data in the manufacturing process, so as to improve the processing accuracy of products; the high-strength integrated bed design improves the gravity processing power of difficult cutting materials; the machine is equipped with an automatic feeding device, which can realize the automatic feeding for continuous, basically realized Assembly line operation of single machine tool.

(3) Reduce floor space and production cost. Compact and beautiful appearance design improves the way of space utilization, Maintenance and repair are more convenient for customers to get great satisfaction; although the price of single turning milling compound processing equipment is relatively high, due to the shortening of manufacturing process chain and the reduction of equipment required for products, as well as the reduction of fixture quantity, workshop floor area and equipment maintenance cost, it can effectively reduce the investment, production operation and management cost of total fixed assets.

What is CNC boring?

What is CNC boring

What is CNC boring?

CNC boring refers to expanding or refining the original holes on the workpiece. The boring feature of CNC machining is to correct the eccentricity of the lower hole, to obtain the precise position of the hole, and to obtain high-precision roundness, cylindricity and surface finish. Therefore, boring is often used in the final process.

Compared with other machining, CNC boring is a kind of difficult machining. By adjusting only one blade (or blade holder), it processes micron sized holes like H7 and H6.

What are the characteristics of CNC boring?

1、 Tool rotation:

CNC machining is different from lathe machining. Due to tool rotation during machining in machining center, it is impossible to master the condition of tool tip in time during machining to adjust the feed amount, etc. It is also impossible to change the machining diameter just by adjusting the CNC button like the CNC lathe. This has become a big obstacle to automatic processing. Because the machining center does not have the function of automatic machining diameter adjustment (except for the one with U-axis function), the boring cutter is required to have the function of fine adjustment mechanism or automatic compensation, especially in the case of fine boring, it is sometimes adjusted at the micron level according to the tolerance requirements. In addition, the direction of chip flow out is constantly changing when boring in machining center, so the cooling of tool tip, workpiece and chip discharge are much more difficult than when machining in lathe. Especially when the vertical machining center is used for steel blind hole rough boring, the problem has not been solved up to now.

2、 Spring knife:

Spring knife is a common and headache problem in boring. The main reasons for the spring knife in the machining center are as follows:

1. Rigidity of tool system: including the rigidity of tool handle, boring bar, boring head and intermediate connecting part. Because it is cantilever machining, especially the machining of small holes, deep holes and hard workpieces, the rigidity of the tool is particularly important.

2. Dynamic balance of tool system: relative to the rotating axis of tool system, if the tool itself has an unbalanced mass, it will cause chatter due to the effect of unbalanced centrifugal force during rotation. Especially in high-speed machining, the dynamic balance of tools has a great influence.

3. Fixed rigidity of workpiece itself or workpiece: for example, some smaller and thinner parts cannot be fully fixed with reasonable jigs due to insufficient rigidity or workpiece shape.

4. Blade tip shape: the cutting resistance is also different due to the different front angle, escape angle, tip radius and chip breaking groove shape of the blade.

Teach you six steps to be proficient in CNC machining

In order to be a master in any industry, you must be able to stand the experience of time and improve your working ability. In the CNC processing industry, it will take at least 6 years to become a master in numerical control (metal cutting) since you graduate from university and enter the factory. He needs not only the theoretical level of engineers, but also the practical experience and hands-on ability of technicians. Kaicheng Precision Hardware Co., Ltd. will share with you: it is not difficult to learn CNC machining well. Dongguan Kaicheng Precision Hardware Co., Ltd. will teach you six steps to play with CNC machine programming!

Step 1: it must be an excellent craftsman without the support and trust of employees. It is impossible to become an excellent craftsman.

Step 2: proficient in NC programming and application of computer software.

Step 3: be proficient in CNC machine tools. It takes 1-2 years of study. The operation pays attention to hand feeling. Beginners, especially college students, understand how to do it in their hearts, but they just don’t listen to the instructions. In this process, we need to learn: the operation mode of the system, the installation of the fixture, the alignment of the part benchmark, the tool alignment, the setting of zero offset, the setting of the tool length compensation, the radius compensation, the loading and unloading of the tool and the tool handle, the cutting edge grinding of the tool, the measurement of the part (can skillfully use the vernier caliper, the micrometer card, the dial indicator, the dial indicator, the inner diameter lever gauge, etc.). Can reflect the level of operation is: horizontal processing, and large gantry (moving beam, top beam) processing. Operation practice needs savvy! Sometimes there is a kind of mood of “leisurely mind, wonderful place is difficult to say with you”. In the numerical control workshop, you can calm down and practice well! Generally speaking, the process of Kaicheng precision hardware from the processing of the first part to the processing accuracy is required to be completed by the numerical control programmer himself. You can’t operate the machine skillfully. This level can’t be passed.

Step four: have a good foundation of fixture and measurement technology. The difficulty of fixture analysis lies in the fact that it is only qualitative and difficult to quantify. If you have no experience in fixture design and parts clamping, it will be more difficult. In this respect, it is recommended to consult the precision coordinate boring machine and Kaicheng precision hardware technicians. When measuring the level accurately, one of the basic skills in machining is to be able to skillfully use vernier caliper, micrometer card, dial indicator, dial indicator, inner diameter lever gauge, caliper, etc. Sometimes when machining parts, CMM can’t be expected.

Step 5: be familiar with CNC machine tools. Proficient in the maintenance of CNC machine tools.

Step 6: CNC machining should cultivate good habits and adapt to the characteristics of CNC machining.

What problems should be considered in CNC machining to control dimensions?

What problems should be considered in CNC machining to control dimensions

In CNC machining, if we want to keep the dimension stable when machining aluminum parts, we need to consider the following two factors:

1、 Force Majeure:

1. Stability of machine tool itself.

If the machine tool is not brand-new or the machine tool has too many CNC machining and has not been debugged, the size deviation caused by the machine tool itself may occur. The deviation factors of machine tool itself are as follows:

Mechanical:

a. The servo motor and the lead screw are loose.

b. The ball screw bearing or nut is worn.

c. Insufficient lubrication between screw and nut.

Electrical:

a. Servo motor failure.

b. There is dirt inside the grating ruler.

c. Servo amplifier failure.

2. Thermal expansion and cold contraction deformation of workpiece.

The deformation of the workpiece after heat expansion and cold shrinkage is inevitable, so we should pay attention to the cooling effect, increase the frequency of in-process measurement, and pay attention to the deformation of the workpiece after cooling.

2、 Avoidable factors:

CNC processing technology

In order to control the machining error, it is necessary to have a reasonable machining process. In the process layout, in addition to the basic machining process (such as milling the basic machining process (such as “first rough and then fine, first face and then hole, first big face and then small face” or the basic machining process details such as “reduce the number of clamping, use the combined clamp as much as possible”) in the use of the fixture, it is also necessary to minimize the number of machining process details We all know that the aluminum parts are very soft due to the processing error caused by the aluminum scraps, and the waste scraps removed can easily cause the processing error of the aluminum parts.

2. Three cutting elements: cutting speed VC, feed F, cutting depth AP and tool compensation

In this respect, simply speaking, on the premise of ensuring the tool wear and machining quality, adjust the cutting parameters so that the cutting performance of the tool can be brought into full play, so as to achieve the highest cutting efficiency and the lowest machining cost.

In the numerical control lathe, there are other factors to be considered, such as cutter head wear compensation.

3. Numerical calculation of manual programming

In the manual programming, it is very common that there are errors in the calculation process. Although it is almost automatic programming now, we should pay more attention to it if we encounter the situation of manual programming.

4. Accurate knife setting.

If the tool setting is not accurate, it will also cause dimensional errors. Therefore, it is necessary to choose a better edge finder. If conditions permit, the machine tool should be equipped with a laser tool setting instrument to ensure the accuracy of the tool setting. If there is no edge finder and no condition, only a simple trial cutting method can be used!

The above is a summary of CNC machining, easy to make the accuracy error of several factors.

What are the advantages of CNC machining?

cnc turned

Nowadays, there are more and more processing technologies around us. In order to meet the demand of the market, various processing technologies are invented to meet the use of the market and consumers. What are the advantages of CNC processing?

1. Complicated process content

This is because the price of CNC machine tools is higher than that of ordinary machine tools, and the simple process of CNC machining is not cost-effective economically. Therefore, the complex process is usually arranged on CNC machine tools, so that it is difficult to complete the process on ordinary machine tools.

2. More detailed layout of work steps

This is due to the problems that need not be considered in the CNC machining process of ordinary machine tools, such as the layout of working steps in the process, tool setting points, tool changing points and the determination of machining path, etc., which can not be ignored in the preparation of CNC machining process.

3. Rely on the procedure to complete all process.

4. NC machining program is a directive document of NC machine tools.

5. CNC machine tools are controlled by program instructions, and the whole process of machining is automatically stopped according to program instructions.

6. The NC machining program not only includes the process of parts, but also includes the process parameters necessary to complete the process, such as cutting parameters, feed path, tool size number and the movement process of the machine tool.

7. CNC machining efficiency is high, machining accuracy is high, labor intensity is low, and it is strong to adapt to different workpiece.

What are the various methods of precision parts machining

With the development of the machining industry, many machining methods have also been developed, which has brought functions or advantages to our use. How good is its development? All of these are obvious to all. Precision part processing is one of them. What are the various methods of precision part processing?

The process method of precision parts machining includes the application of the programmability of the machining center to reasonably program the NC machining, and the application of the humanized operation of the machining center to optimize the cutting parameters. Kaicheng Precision Hardware Co., Ltd. reasonably selects the geometric shape of the cutting tool, and adopts the common high-speed steel drill and end mill to process high-precision and large aperture ratio titanium alloy holes.

The applicability of improved cutting tools, optimized cutting parameters and processing methods are verified through the processing of practical samples. Titanium alloy is a kind of widely used superalloy, which is mainly used in the manufacture of maintenance shell of logging tool

Therefore, the processing technology of titanium alloy for hardware precision parts has a direct impact on the quality of titanium alloy products, which involves the stop of cutting titanium alloy, especially the processing technology of deep hole drilling, and how the processability of deep hole drilling determines the application scope of titanium alloy.

The existing technology of precision parts machining is to use the mixed ceramic bearing to match the smooth oil, which may not be a problem when the spindle is at 15000 R / min. We also found that some manufacturers also use another kind of bearing, whose inner and outer edges are still composed of metal plates, but the rotating parts are composed of ceramic materials with strong rigidity and durability. Heat is the natural enemy of bearing precision and life.

When the main shaft runs to 10000r / min, it is more representative to use oil mist instrument system. Chengchuang this system provides less (but sufficient) smooth oil to reduce the heat generated by the bearings, in addition, the blowpipe also helps to dissipate the heat. The rest of the heat is transferred to a cooling system that does not cause circulation and is blocked.

What is the application of precision machining in electronic products?

precision machining

Electronic products are related products based on electric energy, including smart phones, electronic watches, computers, video recorders, etc. these products are more or less used by everyone in daily life, while mobile phones and computers, almost everyone has them. But do you know that most of these inseparable products and structural parts are made by precision machining? What is the application of precision machining in electronic products?

First of all, we are very clear that when we buy an iPhone that is crazy inside, or a Mac computer that program apes have been in love with for a long time, we will assemble some coats (protective shell or protective sleeve) for it, because if the naked machine falls to the ground and bumps, it is easy to cause the scratch of the device shell, thus affecting the beauty. The equipment casings we carefully protect come from precision machining. The iPhone has used the so-called aviation grade aluminum magnesium alloy casings since the 6th generation. At present, the mainstream brand mobile phones on the market mostly use aluminum magnesium alloy, with the advantages of light weight, good heat dissipation and high strength. However, due to the complexity of its processing, it needs to be processed with precision machinery to achieve a very high precision. To a certain extent, it is seamlessly combined with the mobile phone to prevent water and dust, so the price is high.

Of course, this technology is not only applied to the mobile phone shell, but also to many metal structures inside the mobile phone. In order to ensure the compatibility of the machine and parts and the stability of the performance of the equipment in the process of operation, the parts need to have quite high precision. Therefore, this kind of parts without standard fall into the production of major domestic processing plants.

It is not difficult to understand from the above, for example, the parts, nuts and shells inside the notebook computer, the movement, needle and buckle in the electronic watch all use the precision machining technology correspondingly. This technology is widely used, but we are in the layman did not pay much attention to and understand.

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Surgical mask machine

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Our factory specializes in CNC machine processing

Our factory specializes in CNC machine processing, hardware lathe parts, hardware machinery accessories, medical equipment processing, axle parts processing, precision hardware processing, lighting hardware accessories, CNC numerical control lathe processing, precision mechanical parts processing, numerical control lathe processing parts, etc. Products are widely used in household appliances, instruments and meters, through. Information, aerospace, computer, mechanical equipment, automotive parts and other fields. Welcome to send drawings for price consultation.

How to Realize Tool Compensation Function in CNC Machining

In CNC machining center, because of tool wear, regrinding or replacement of new tools, the parameters of relevant tools in the programming process will change, and the tool trajectory will change. If the adjustment is not enough, the final machining accuracy of the workpiece will be affected. For example, the tool center trajectory is calculated from scratch and the program is revised. In this way, not only time-consuming and labor-consuming, but also high error rate, the most convenient way to call CNC CNC system tool radius compensation performance, workpiece programming we only need to compile processing procedures according to the appearance of the workpiece, the system will automatically calculate the tool center trajectory, so that the tool deviates from the appearance of the workpiece a radius value. Even if there is a change in tool parameters, only the detailed tool parameters need to be changed, and no change in all the processing procedures is required. This greatly improves the processing efficiency of the machining center.

1. Establishment and cancellation of cutter radius compensation

Simply speaking, tool radius compensation can be divided into two kinds: left compensation and right compensation. Goodbye is defined by G41 and G42. When the center path of the tool is located on the right side of the part appearance, it is called the right compensation of the tool radius; otherwise, it is called the left compensation of the tool radius.

1. Establishment of Tool Radius Compensation

The establishment of tool radius compensation is a process in which the tool center trajectory transits from coincidence with programming trajectory to deviation from a tool radius value when the tool approaches the workpiece from the starting point to the feed speed. G41 is used to compensate the left radius of the cutter and G42 is used to compensate the right radius of the cutter.

2. Revocation of Tool Radius Compensation

The process of revoking cutter radius compensation is similar to that of creating cutter radius compensation. After the final cutter radius compensation track is processed, the cutter withdraws the workpiece and returns to the point of withdrawal. In this process, the cutter radius compensation should be revoked, and its instructions are defined by G40. The tool withdrawal point should be located outside the appearance of the part, and it may be the same as the starting point, but it may also be different.

2. Matters needing attention in inputting compensation for cutter radius in CNC machining

The change of tool radius compensation usually occurs after a period of processing in the machining center. For a continuous program segment, when the cutter radius compensation is changed, the vector at the end of a program segment is calculated with the cutter compensation specified by the program segment.

When programming NC program, we usually input the compensation amount of tool radius into the compensation code as positive value. If the compensation amount of tool radius is set as negative value, when the target of tool trajectory is fixed, it is equal to the compensation position instruction in NC program. The exchange of G41 and G42 may occur in processing. Since the processing of the outer side of the workpiece by the heart turns into the inner side processing, unexpected problems arise, so it is necessary to pay attention to the configuration of two compensation targets when inputting radius compensation.

Author Archive chengcg

Knowledge of CNC turning and milling machining

Machining of CNC turning and milling composite parts

What is CNC boring?

What is CNC boring?

What are the characteristics of CNC boring?

1、 Tool rotation:

2、 Spring knife:

Teach you six steps to be proficient in CNC machining

Step 1: it must be an excellent craftsman without the support and trust of employees. It is impossible to become an excellent craftsman.

Step 2: proficient in NC programming and application of computer software.

Step 5: be familiar with CNC machine tools. Proficient in the maintenance of CNC machine tools.

Step 6: CNC machining should cultivate good habits and adapt to the characteristics of CNC machining.

What problems should be considered in CNC machining to control dimensions?

What are the advantages of CNC machining?

What are the various methods of precision parts machining

What is the application of precision machining in electronic products?

CNC Machining cial folding roll part for Surgical mask machine

Our factory specializes in CNC machine processing

How to Realize Tool Compensation Function in CNC Machining

CNC Machining parts

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