Monthly Archive September 28, 2020

In addition, the CNC tool position and tool position control are also discussed.

Compared with manual machining, CNC machining has great advantages, such as the parts produced by CNC machining are very accurate and repeatable; CNC machining can produce parts with complex shapes that cannot be completed by manual processing. CNC machining technology has been widely promoted, most of the machining workshops have the ability of NC machining. The most common NC machining methods in typical machining workshops are CNC milling, CNC lathe and CNC EDM wire cutting (WEDM). The tool for NC milling is called CNC milling machine or CNC machining center. CNC turning lathe is called CNC lathe center.

NC machining G code can be manually programmed, but usually the machining workshop uses CAM software to automatically read CAD file and generate G code program to control NC machine tool. Leading CNC machine tool brands include Hass, DMG (Deckel MAHO GILDEMEISTER), Mazak, Mori Seiki, fadal and wasino.

There are two steps in the formulation of machining process specification. First of all, it is to draw up the process route of parts processing, and then determine the process size of each process, the equipment and process equipment used, as well as the cutting specifications, man hour quota, etc. These two steps are interrelated and should be analyzed comprehensively.

The number of each working procedure, the total processing route, and the selection of the overall surface processing process are determined. The general principles of the process route are as follows:

1. Machining datum plane first

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

1. Dividing processing stages

The surface with high machining quality is divided into three stages: rough machining, semi finishing and finishing. It is mainly to ensure the processing quality, to use the equipment reasonably, to arrange the heat treatment process, and to find the blank defects easily. machining

CNC machining center is locked by software. When the automatic operation button is pressed during simulation processing, it is not possible to directly see whether the machine tool has been locked in the simulation interface. Computer gong processing | Dongguan computer gong processing | Shenzhen computer gong processing | mechanical parts processing | Guangzhou computer gong processing | often there is no tool setting during the simulation. If the machine tool is not locked and running, it is very easy to hit the tool. Therefore, before the simulation processing, you should go to the operation interface to confirm whether the machine tool is locked. Forget to turn off the idle switch during processing. In order to save time, the idle switch is often turned on when the program is simulated. Idle running means that all moving axes of the machine tool run at the speed of G00. If the running switch is not turned off during machining, the machine tool will ignore the given feed speed and run at G00 speed, which will cause the accident of cutting and hitting the machine tool. There is no return to the reference point after running the simulation without load. When checking the program, the machine tool is locked, and the tool relative to the workpiece processing is in simulated operation (absolute coordinates and relative coordinates are changing). At this time, the coordinates are inconsistent with the actual position. It is necessary to use the method of returning to the reference point to ensure that the zero point coordinate of the machine is consistent with the absolute and relative coordinates. If there is no problem found after the calibration program, the machining operation will cause tool collision. The direction of override release is wrong.

When the machine tool overtravel, press and hold the overtravel release button and move in the opposite direction with manual or manual mode, which can be eliminated. However, if the direction of release is reversed, it will cause damage to the machine tool. Because when pressing the override release, the over travel protection of the machine tool will not work, and the travel switch of the over travel protection is already at the end of the stroke. At this time, the table may continue to move towards the overtravel direction, and eventually the screw will be broken, causing damage to the machine tool. Computer gong processing | mechanical parts processing | Dongguan CNC machining center | Dongguan high-speed computer gong processing designated line running time mark is improper. When the specified line is running, it is usually executed from the cursor position down. For the lathe, it is necessary to call the tool offset value of the tool used. If the tool is not called, the tool in the running program section may not be the required tool, which is very likely to cause a tool collision accident due to different tools. Of course, in the machining center, CNC milling machine must first call the coordinate system such as g54 and the length compensation value of the cutter. Because the length compensation value of each knife is different, it may cause knife collision if it is not called.

CNC machining center CNC machine tool as a high-precision machine tool, anti-collision is very necessary, require the operator to develop a careful habit, according to the correct method to operate the machine tool, reduce the occurrence of tool collision. With the development of technology, there are some advanced technologies, such as tool damage detection, anti-collision detection and adaptive machining, which can better protect CNC machine tools. After the industrial revolution, the pace of production can be said to be faster and faster. Nowadays, CNC machine tools seem to be used in many fields, because of the precise control and high-end technology, the product specifications produced by them are also more standardized. All of this, thanks to CNC complex parts processing technology is becoming more and more high-end, because of this, so modern we can enjoy the production mode and efficiency that we did not dare to think of before.

Since the advent of CNC machine tools, more and more manufacturers have begun to introduce such good machinery into their respective industries. Businesses hope to pursue high output, but also require products to meet production standards. This is a very strict requirement for the machine tool. It not only requires the working efficiency of the whole machine tool to maintain high efficiency, but also has many fine requirements for each internal part. CNC complex parts processing can be said to be the basis for ensuring the overall quality of CNC machine tools. Only by ensuring that the processing technology of CNC complex parts remains at a high level, can many manufacturers be assured of using it Create more and better products.

Measurement datum and positioning datum.

(1) Assembly datum: the datum used to determine the position of parts in parts or products during assembly, which is called assembly datum.

(2) Measurement datum: the datum used to check the size and position of machined surface, which is called measuring datum.

(3) Positioning datum: the datum used for workpiece positioning during machining, which is called positioning datum. The surface (or line or point) processed by computer gong as the positioning reference can only select the rough surface in the first process. This positioning surface is called rough datum. The machined surface can be used as the positioning reference in the following processes, and the positioning surface is called the precise reference.

In the process of turning a blank into a finished product, the total thickness of the metal layer cut off on a machining surface is called the total machining allowance of the surface. The thickness of the metal layer cut by each process is called the machining allowance between processes. For the rotating surface such as outer circle and hole, the machining allowance is considered from the diameter, so it is called symmetrical allowance (i.e. bilateral allowance), that is, the actual thickness of the metal layer cut off is half of the machining allowance on the diameter. The machining allowance of the plane is the unilateral allowance, which is equal to the actual thickness of the metal layer removed. The purpose of leaving machining allowance on the workpiece is to remove the machining errors and surface defects left by the previous process, such as the surface cold and hard layer, air hole and sand inclusion layer on the casting surface, oxide scale, decarburization layer and surface crack on the forging surface, internal stress layer and surface roughness after cutting. The precision and surface roughness of the workpiece are improved. The size of machining allowance has great influence on machining quality and production efficiency. If the machining allowance is too large, it not only increases the labor of machining, reduces the productivity, but also increases the consumption of materials, tools and power, and increases the processing cost. If the machining allowance is too small, it can not eliminate all kinds of defects and errors in the previous process, and can not compensate for the clamping error in this process, resulting in waste products. The selection principle is to make the allowance as small as possible on the premise of ensuring the quality. Generally speaking, the more finish machining, the smaller the process allowance.

Applicability:

In the process of turning a blank into a finished product, the total thickness of the metal layer cut off by the computer gongs on a machining surface is called the total machining allowance of the surface. The thickness of the metal layer cut by each process is called the machining allowance between processes. For the rotating surface such as outer circle and hole, the machining allowance is considered from the diameter, so it is called symmetrical allowance (i.e. bilateral allowance), that is, the actual thickness of the metal layer cut off is half of the machining allowance on the diameter. The machining allowance of the plane is the unilateral allowance, which is equal to the actual thickness of the metal layer removed. The purpose of leaving machining allowance on the workpiece is to remove the machining errors and surface defects left by the previous process, such as the surface cold and hard layer, air hole and sand inclusion layer on the casting surface, oxide scale, decarburization layer and surface crack on the forging surface, internal stress layer and surface roughness after cutting. The precision and surface roughness of the workpiece can be improved by computer gonging. The size of machining allowance has great influence on machining quality and production efficiency

CNC computer gongs processing with its high production efficiency, good economic benefits and other advantages, has been developed in the machining industry, is widely used by more and more processing enterprises. Moreover, CNC computer gongs processing also has four advantages, let the mechanical parts processing factory’s small knitting together to understand it.

CNC computer gongs processing refers to the processing with CNC tools. CNC index controlled machine tool is programmed by NC machining language, usually G code.

1. The accuracy of the work is relatively high, and the quality of the processed products is guaranteed.
2. Even if there are multiple coordinates, there is no need to worry, because it can realize the linkage between the coordinates, and can process parts with complex geometry structure.
3. It is necessary to replace the processed parts, but only need to change the relevant data to realize the work and simplify the work
4. Because the computer gong is automatic, it can reduce the labor force and increase the productivity.

Now, with the number of automation equipment, is more and more, the number of equipment is increasing, many products need to be processed, and processing is to use equipment, to process, Dongguan precision parts processing is one of them, so how to improve the quality of precision parts processing, let’s talk about it with you.

First of all, the staff must have rich working experience in machining and excellent technology. Mechanical processing must have excellent technology to do well, as we all know, machining is the same fine work. It is very difficult to test the production process. Even if it can be done well, it will take a long time. If you don’t start well at the beginning, it is easy to give up all the previous achievements.

Secondly, whether the processing process is standard and excellent also determines whether the product is of high quality. This is also an indispensable reference point for us to formulate the company’s rules and regulations. Production and management are bound to need a set of perfect process, the process is to produce perfect products and services.

Thirdly, we must pay attention to the communication in the production link, whether it is the node time or there are problems, we should strengthen the communication, the communication between the processing plant and the equipment manufacturer is an important condition for the processing of automatic equipment parts. The processing personnel usually carry out the processing work according to the drawings, but more often, many process places can be simplified and improved, which can not only reduce the cost, but also improve the efficiency.

In the process of processing, we usually encounter large and small problems, which are very common to us. When we encounter problems, we need to solve the problems, rather than let it go. CNC parts processing is one of them. So what are the main factors affecting the cold work hardening of CNC parts processing.

Processed material factor: the hardness of the processed material is small, and the greater the plasticity, the more serious the cold work hardening of the material is.

Tool shape factor: CNC machining tool front angle, edge fillet and tool back wear have a great impact on the cold work hardening layer. The depth and hardness of the hardened layer increase with the decrease of the rake angle and the increase of the wear loss of the edge and back.

Cutting parameters of CNC parts: the change of cutting speed and feed rate has a great influence on cold work hardening. With the increase of cutting speed, the contact time between the tool and the workpiece is short, the plastic deformation degree is small, and the hardening layer and hardness are reduced. With the increase of feed rate, the degree of plastic deformation and the degree of surface cold work hardening increase.

The above are the main factors affecting the cold work hardening of CNC parts. These phenomena may be caused by these factors. As long as the above factors are avoided, there will be no hardening phenomenon. Therefore, more attention should be paid to the processing.