CNC MILLING MACHINE FOR SALE

CNC machining centers are developed from CNC milling machines. CNC machining center can realize three axis or more than three axis linkage control, to ensure that the tool for complex surface processing. In addition to linear interpolation and circular interpolation functions, the CNC machining center also has various fixed processing cycles, automatic compensation of tool radius, automatic compensation of tool length, graphic display of machining process, man-machine dialogue, automatic fault diagnosis, off-line programming and other functions. The same as CNC milling machine, CNC machining center is also composed of CNC system, servo system, mechanical body, hydraulic system and so on. The biggest difference with CNC milling machine is that the CNC machining center has the function of automatic tool change. By installing tools for different purposes in the tool magazine, the workpiece can be clamped at one time, and different processing requirements can be completed by automatically switching tools. Machining center is a high-efficiency automatic machine tool composed of mechanical equipment and CNC system, which is suitable for machining complex parts. The preparation of processing and forming is an important factor to determine the processing quality.

Alignment of program origin during VMC1060 CNC machining center programming？

1. Z coordinate alignment method

Generally, for the Z axis alignment of vertical CNC machining center, the tool block is often used to measure the tool Z coordinate value. The alignment steps are:

Firstly, adjust the CNC system to manual mode and switch the screen to the display state of mechanical coordinates; Then place a tool setting block on the workpiece and use the tool setting block to test plug with the tool end face or tool tip. Through the repeated adjustment of the machine tool spindle in the Z direction, the tool setting block contacts the tool end face or tip, which is the program origin in the Z direction. However, be careful in the alignment process to prevent the collision between the tool and the tool setting block. This is to input the Z coordinate value of the mechanical coordinate displayed on the screen into the CNC system.

2. Use the dial indicator to align the program origin

Use the dial indicator to find the program origin, which is suitable for the workpiece with rotating geometry. Align the dial indicator to make the spindle axis line of the vertical CNC machining center coaxial with the workpiece axis line. The specific operation steps are as follows:

Firstly, manually lower the spindle of the machine tool near the upper surface of the workpiece, adsorb the magnetic meter base on the end face of the spindle, and adjust the percentage meter so that it is perpendicular to the cylindrical surface of the workpiece; Then align the x-axis or y-axis separately. Rotate the spindle to make the dial indicator rotate around the workpiece between the minimum diameter and the maximum diameter. Repeatedly adjust the workbench to make the dial indicator pointer at the same position at two points, indicating that the alignment of x-axis is completed. Similarly, align the Y axis, and then input the corresponding coordinate values of the XY axis into the CNC system of the vertical CNC machining center.

How to machine external thread with VMC1060 CNC Milling Machine?

The traditional external thread processing mainly uses thread turning tool, die tool and other tools to complete, the work needs many times to cut the thread contour, low production efficiency.  The inner thread is mainly completed by tap, the thread precision is difficult to ensure.  At the same time, it is difficult to process the thread with the above traditional turning method or tap or die, which is not allowed to have transition buckle or cutter groove structure. With the increasing popularity of CNC machine tools, thread milling technology is applied more and more in the machinery manufacturing industry, especially in the mold manufacturing industry.  Thread milling is through the CNC machining center of the three axis linkage, the use of thread milling cutter spiral interpolation milling and completed, that is, the cutter in the horizontal plane for a week of circular motion, in the vertical plane is linear movement of a pitch.  Thread milling has many advantages such as high processing efficiency, high thread quality, good tool versatility and good processing safety.

Common thread milling cutter types mainly include: ordinary machine clip type thread milling cutter, integral thread milling cutter, integral thread milling cutter with chamfering function, thread drilling milling cutter and thread spiral drilling milling cutter.  Each type of cutter has its own characteristics: machine clamp type thread milling cutter is the thread milling most commonly used and inexpensive tool, its structure is similar to the ordinary machine clamp type milling cutter, by the reusable cutter rod and can be easily replaced blade composition;  Integral thread milling cutter compact structure, more suitable for CNC machining center processing, small diameter thread;  The structure of integral thread milling cutter with chamfering function is similar to that of ordinary integral thread milling cutter, but there is a special chamfering edge at the root (or end) of the cutting edge, which can be processed at the same time the thread end chamfering; Thread drilling and milling cutter is a kind of small and medium-sized diameter internal thread processing tool, can complete drilling thread bottom hole, hole chamfering and internal thread processing, reduce the number of cutting tools;  Thread auger milling cutter is also a solid carbide tool for efficient machining of internal thread, and can also be machined to bottom hole and thread in one go. The motion track of thread milling is a spiral line, which can be realized by the three-axis linkage of nc drilling and tapping center.  With the general contour of CNC milling, thread milling can also be started when the 1/4 arc cut or straight cut, and, in order to ensure that the milling cutter rotation a week is completed thread machining, milling should be as far as possible to choose the width of the blade is greater than the length of the milling thread.  Ri is the radius of the bottom hole of the thread,Re is the radius of the cutting arc,Ra is the radius of the top of the thread,C is the safe distance,B is the Angle of the cutting arc,a is the Angle of 1/4 circle.

The cutting load measured in the direction perpendicular to the working plane through the base point of the cutting edge.  The cutting speed, the amount of backdraft and the number of tool runs are determined by the material of the tool and the parts.  The cutting speed of thread turning is generally lower than that of ordinary turning.  The quantity of back cutting and the number of cutting will directly affect the quality of thread processing, the quantity of back cutting and the number of cutting when turning thread.  The choice of cutting amount of CNC milling can also refer to the relevant cutting parameters of the car thread.  Because the milling thread is a single edge cutting, so its cutting speed should choose half of the turning is appropriate, the value of the back tool can still be selected according to the turning.

What are the reasons for the abnormal sound of the spindle of the high-speed CNC machining center?

Users who often use the high-speed machining center should know that the most common problem in normal use lies in the belt spindle of the high-speed machining center. After we use it for a long time, the belt drive will slowly age with the passage of time, and the spindle box belt will make an abnormal sound. When we hear this sound, most of the problems are with the belt, There are several common reasons:

The belt tension of the spindle connecting the servo motor is too low, The tension of the belt connecting the main shaft to the servo motor cannot be too low. If the tension is too low, it will appear that the belt connecting the main shaft to the servo motor is too loose, which is easy to cause slip and make abnormal noise during heavy cutting.

The belt tension between the spindle and the servo motor is too high，The tension of the belt connecting the main shaft to the servo motor can not be too tight, too tight will easily lead to belt wear, skid phenomenon, abnormal sound.

The belt connecting the main shaft to the servo motor is damaged. In general, high-speed machining center for a long time, there will inevitably be some defects, such as the transmission belt, the use of a long time will wear, which is also one of the reasons for the abnormal sound of the belt.  So the transmission belt of better quality has a longer service time, and the inferior transmission belt has a shorter service time.

The tooth profile of the driving belt does not match that of the servo motor and spindle. Because the driving belt of the high-speed machining center will cause some wear and tear when it is used for a long time, so many customers buy the driving belt to replace it by themselves in order to save cost. After replacement, they find that the tooth type of the driving belt is not consistent with the tooth type of the servo motor and the spindle, which will cause abnormal sound during use.  Advise clients when buying drive belt must pay attention to buy back the drive belt is removed and the wear and tear of belt the same type, if you insist to use different types of transmission belt, causes the belt in the transmission process of abnormal noise, even lead to the servo motor and main shaft gear wear and tear, caused serious consequences.