Yearly Archive September 21, 2020

We have a lot of processing methods, especially CNC processing, we are familiar with it is relatively high. CNC machining center is an automatic machine tool with high efficiency and many functions. Bearing is a part of CNC machining center. Its main function is to support the rotation of the machine, reduce the friction coefficient and ensure the rotation accuracy. In this chapter, we mainly talk about the methods of bearing disassembly.

1、 Percussion method

When striking, the force is concentrated on the inner ring of the bearing. This method is simple, but easy to damage the bearing. When disassembling, pad the bearing with objects under the ground, and then use a hammer to knock the bearing down.

2、 Pull out method

Using a special puller, the bearing can be pulled out only by rotating the handle. It should be noted that the puller should be stuck on the end face of the bearing inner ring and the bending angle of the puller should be less than 90 °.

3、 Pushing method

This method can be realized with the help of a press, and is relatively safe for the bearing, but it should be noted that the force point of the press should be placed on the center of the shaft.

4、 Hot tearing method

Pour the bearing with an oil pot of about 100 ° onto the bearing. According to the principle of heat expansion and cold contraction, the bearing will expand after being heated. At this time, the puller can be used to pull it out. Use this method to be a little small, to avoid scalding.

As the saying goes, details determine the success or failure, so we should pay attention to the details and know the specific operation method when CNC processing, so as not to affect our work. When we find problems in the process of use, we should solve them in time, so as not to cause trouble to our work. Today, I’d like to learn how to do if the spindle of CNC machining center does not rotate, as follows:

1. First of all, we should know whether we can see the parameters after 9000, and if we can see them, whether the parameters are needed. I have encountered such a situation, it is 0i-MC system, all axes are normal, that is, the main shaft does not rotate. Later, we changed the parameters after 9000.
2. There was an oi-m in the previous unit which had a similar situation. Finally, it was found that the pneumatic valve of the tool arm was stuck. After the tool change was completed, the tool arm should be ready for the next knife, but the knife arm was not put down, and there was no alarm. After the valve was replaced, it was OK. And whether there is a hydraulic fixture, the fixture is not tightened, or the clamping signal is disconnected.
3. Take a look at the spindle monitoring, turn the spindle by hand to see if there is any value? Is the value correct? Once encountered, there is no alarm, the spindle does not rotate. No monitoring value. Adjust the interval. Or replace it with a new one.

In order to improve our work efficiency, CNC machining is often carried out around us, so we are familiar with it. No matter what we use, we should pay attention to maintenance, CNC machining center is mainly used to process parts. The bearing determines the bearing capacity of a machining center. If the bearing performance is good, the bearing load will also be large. Therefore, we should do a good job in the daily maintenance of the bearing, so as to keep the performance of CNC machining center in the best state and prolong the service life of the bearing. How to maintain the bearing in CNC machining center? Let’s take a look at the following:

1. First, clean the bearing in gasoline, wipe off the oil sludge and dust left on the bearing, and gently wipe and polish the rusty bearing with metallographic sandpaper until there is no roughness by hand.
2. Dry the cleaned bearings with dry rags, and then soak them in antirust oil. In this process, the bearing should be completely in contact with the antirust oil, and the bearing should not be stopped. Only in this way can the oil film formed by the antirust oil cover the surface of the bearing and achieve the purpose of antirust.
3. Next, apply lithium grease and grease evenly on the surface of the bearing, including inner and outer rings, wheels and cages. And it is to wipe while rotating the bearing, so that the grease really into the bearing, play a full role in lubrication

Now is the era of industry, we often around Dongguan CNC processing, so when Xiaobian said, I feel very familiar. CNC machining center in the process of work, if there is a power failure to solve the situation, CNC machining center unit power supply has two lights, one is the power indicator, is green; the other is the power alarm light, is red, the power unit here, including power input unit and power control part.

First of all, we should know that if the power supply of CNC machining center cannot be connected, if the power indicator (green) is not on. The fuses F1 and F2 of the power supply unit have been blown. This is due to high input voltage, or the components of the power supply unit itself have been damaged.

The input voltage of CNC machining center is low. Please check the voltage entering the power supply unit. The allowable voltage value is AC 200V + 10%, 50 Hz ± 1Hz. The power supply unit is not good, there is element damage in it. The power indicator light is on, and the alarm light is also gone, but the power supply cannot be connected. This is because the power on condition is not satisfied. By the following switching circuit, the power supply conditions are as follows:

CNC machining center power supply has three conditions: the first point, the source on button closed. Second, the power off button is closed. Third, the external alarm contact is opened.

The alarm light of power supply unit of CNC machining center is on: the fuse of 24 V output voltage is fused, and + 24 V voltage is used on 1.9 “display screen. Check whether + 24 V is short circuited to the ground. 2. The display / manual data input board is poor.

As the saying goes, details determine the success or failure, so we should pay attention to the details in CNC processing to avoid problems. According to the information learned by the editor, the nut pair of ball screw in CNC machining center is a kind of rotating device with small motion friction and easy to eliminate rotation clearance. It has the advantages of small wear, high efficiency, high precision and low temperature rise. It has brought great help to the performance improvement of transmission system.

Do all ball screws of CNC machining center need pre tightening

The reason of preloading is to prevent the ball from slipping, but not all ball screws need preloading. The higher the preloading accuracy, the greater the load capacity. Specific or to see the needs of users to choose the level of pre tightening.

What are the preloading methods

1. Double nut threaded pre tightening

The relative axial position of two nuts is adjusted by round nut, which is one of the pre tightening methods.

1. Double nut gasket preloading

This method is simple and widely used. This is the way to add gasket between the double nuts. The manufacturer can adjust the preload according to the requirements of customers. It is very convenient to install and disassemble.

1. Self preloading of single nut with variable lead

This pre tightening method is to produce a lead sudden change in a circle in the middle of the internal thread of the nut, so that the left and right ball can be preloaded by axial dislocation after assembly. CNC machining center ball screw nut pair to eliminate the axial clearance is mainly to improve the transmission accuracy and stiffness.

With the continuous development of industry, people’s living standards continue to improve. When Xiaobian talks about CNC processing, we feel very familiar, mainly because it is often carried out. As a skilled CNC programming operator, after understanding the machining requirements, process routes and machine characteristics of precision mechanical parts, he can operate the CNC machining machine to complete the task. Therefore, the working principle of CNC machining is divided into several points:

Firstly, in the clamping process, in order to simplify the machining origin of each positioning surface relative to CNC machining center, there should be accurate coordinate size. Secondly, the direction of mechanical parts installation is consistent with the workpiece coordinate system and machine coordinate system selected in programming, and directional installation. In the production and processing of batch precision mechanical parts, it is necessary to consider the fixture which can be disassembled in a short time and changed into a fixture suitable for new workpiece. Because the auxiliary time of CNC machining center has been compressed very short, the loading and unloading of supporting fixture can not take up too much time.

In the production of the fixture, should have as few workpieces as possible and higher stiffness. The fixture should be open as far as possible, the space position of clamping workpiece can be low or low, and the installation fixture can not interfere with the tool path. In order to avoid affecting the processing process, ensure that the processing content of the workpiece is completed within the stroke range of the spindle!

When there is an interactive worktable in CNC machining, the fixture design must prevent the spatial interference between the fixture and the machine tool due to the movement, up support, down support and rotation of the worktable. Try to finish all the processing contents in one clamping. When it is necessary to replace the clamping point, special attention should be paid not to damage the positioning accuracy due to the replacement of the clamping point. If necessary, it should be explained in the drawing processing technology

In order to improve our work efficiency, we often carry out CNC processing, we are familiar with it. Pay attention to details when processing to avoid problems. Today, I’d like to discuss the cover parts of CNC machining process with you

1. Process analysis of parts

The material of cover plate is cast iron, and the blank is casting. The cover plate needs to be processed for the plane, hole and thread are concentrated on a, B surface, the four sides of the edge do not need to be processed, the highest accuracy should reach it7 level. Then we can take the A-side as the positioning reference, and process it in the previous process. Select the B-side and the hole on the B-side to process on the machining center.

1. Design process

(1) Select processing method

Rough milling can be used for surface B_ Finish milling: the dimension accuracy of Φ 60h7 hole is it7, The roughness is ra0.8um, and the blank hole has been cast, so rough boring and semi precision boring can be carried out+ Fine boring: the dimension accuracy of Φ 12h8 hole is required to be grade it8, and the roughness is ra0.8um. In order to prevent the drilling deviation, we can drill the center hole, drill the hole, enlarge the hole, ream the hole; when the thread hole is between M6 and M20, we can drill the bottom hole first and then tap the thread.

(2) Determine the processing sequence

In order to reduce the frequency of tool change and according to the principle of rough before finish and face to hole, the processing route is as follows: rough and finish milling B surface – coarse, semi finish, finish boring Φ 60h7 – drilling the center hole of each smooth hole and threaded hole – drilling, expanding 4 × Φ 2h8 hole – countersinking 4 × Φ 16 hole – twisting 4 × Φ 12h8 hole – M16 screw hole, drilling bottom hole, chamfering and tapping.

For the long-term development trend of industry, there will be a variety of modern scientific and technological development, to get different industrial products production and processing. In the process of getting new processing procedures, the processing of “CNC processing” will get new operation procedures. Then in the development of modern industry, any trend change will get new technological innovation, making life begin to move towards a better direction. Therefore, for the development stage of CNC processing, there will be more appropriate trend processing process. Similarly, more technical operations will be carried out according to different processes.

Facing the development of various science and technology, it can be said that this era has begun to enter a prosperous stage. In different countries, different regions, the industrial development field is also constantly expanding to get better technology operation process. Then, in the development process of different industrial projects, more work will be carried out according to different national science and technology Industrial processing, also for different machinery and equipment, different industrial technology to get a simple but efficient technical operation process. Therefore, in the process of slow historical changes, the development of industry will get more changes and technological updates.

The process of “CNC processing” is to get more operation according to more process operation. For the current industrial development, will get more functional changes, to carry out different processing procedures, for the simplified operation of CNC processing, mainly for the development of high-tech processes, but also will get different scientific and technological processing process. So in the process of different industrial technology capacity changes, there will be a new processing trend.

rous operation, Dongguan CNC processing will also have new process processing changes.

But in different steps to carry out the specified CNC processing process, will be based on the better development trend, to get the processing change trend of different processes. Then, in the process of more steps, there will be different change operations. Therefore, in the process of CNC machining operation steps, the appropriate technology operation will be obtained, and the appropriate functional operation trend will be carried out. But in the process of specified steps processing, for CNC (computer gongs) processing trends, will be carried out in different steps.

Different processing routes will have better development and Realization of operation process, can carry out different change trend, and also can get better step processing trend according to the actual processing process. Therefore, for the CNC processing steps in the process of operation, to carry out a better function. In order to ensure the realization of various high-tech processing, it is necessary to ensure the process of determining the processing route to carry out better function operation. In the process of determining the CNC processing route, different processes will be carried out.