Tool setting and radius removal of machining center

1. In fact, the tool setting methods of machining center and NC milling are the same. The difference between them is that the machining center has one more tool library. There are two kinds of tool setting in machining center. One is the same as the NC milling tool setting you said. In this way, you should pay attention when programming, and don't forget to rece the coordinate of the place to be milled by a radius; The other is to program according to the drawing, without adding or subtracting the radius, enter the correct tool complement number in the tool offset setting page! But when using it, we should pay attention to the format. There are G41 and G42, which are used to add radius compensation. We must use them to add radius compensation in front, and then we can process the workpiece.

2. If you don't have a tool setting instrument to measure the tool, you should first put the tool into the spindle for manual tool setting (it's better to use a pair of tool blocks for tool setting), input your measured data, and then put it into the tool magazine. One by one, put them into the magazine

if you have a tool setting instrument, you only need to write down the length or radius of each tool in the tool setting instrument (when using G41 and G42 tools for compensation), and then input the data into the machine tool (note that the tool number in the tool library should correspond to the data you input one by one), so you don't need to set the tool on the machine tool

there is another case, that is, some machine tools have their own tool setting device. After you load the tool, you only need to input a program format on the machine tool to automatically set the tool (for example, cincinnata horizontal plus, the format is g68 x0 Y0 T2, press run, the tool will automatically set to a tool setting device, automatically calculate the tool length and automatically input data). Of course, such machine tools are generally expensive.

3. In this way, the length of z-axis is matched with G43. Or change the coordinate system directly. What you said may be that the thickness of the blank is not uniform. The thickness of the blank will be increased by 2.5, and the thickness of the blank will be - 2.5, which is similar to that of the first part. G41 and G42 tool radius correction, the corrected program does not need to add / subtract tool radius programming.

4. Since you are the machine tool of the machining center, you must have the tool library function, that is, there are many knives on the machine tool
when we set the tool, the first thing we need to do is to determine the zero point in the XY direction. Your method can determine the zero point in the XY direction, but you have to remove a tool radius
then we determine the value in the Z direction, which has many tool setting methods. Let me explain your kind of
if you fix a tool as the reference tool in the tool length compensation parameters (such as No. 1 tool), then you set this tool to zero in the length compensation
then the value measured when the tool tip touches the upper surface of the workpiece is the value in Z direction that we need. There is no need to subtract a tool length value. We input this value into the origin offset (g54 / G55, etc.)
the tool setting values of other tools should be input into the tool length compensation
so how to set the tool? You still touch the upper surface of the workpiece with the tool tip, and then press the main interface of the machine tool. There must be a relative coordinate value on it, and the value in Z direction in the coordinate value is the data we need
for example, suppose that the tool is 10 mm long relative to the reference tool (through visual inspection), then the corresponding value should be about 10 mm
in the same way, other cutting tools can be proced.

5.

1. Return to zero (return to the origin of the machine)

before tool setting, it is necessary to return to zero (return to the origin of the machine) so as to clear the coordinate data of the last operation. Note: the X, y and Z axes all need to return to zero

extended data:

basic matters

1. When entering the workshop for internship, you should wear work clothes, tie the big cuff tightly, and tie the shirt into the pants. Female students should wear safety helmets and put braids into the helmets. Sandals, slippers, high heels, waistcoats, skirts and scarves are not allowed to enter the workshop. Note: gloves are not allowed to operate the machine

Pay attention not to move or damage the warning signs installed on the machine tool

The working space should be large enough

When a task needs to be completed by two or more people, we should pay attention to the coordination between them

It is not allowed to use compressed air to clean the machine tool, electrical cabinet and NC unit

Practice should be carried out on designated machine tools and computers. Without permission, other machine equipment, tools or electrical switches shall not move disorderly

Before operation, you must be familiar with the general performance, structure, transmission principle and control program of CNC milling machine, and master the function and operation program of each operation button and indicator light. Do not operate and adjust the machine tool until you understand the whole operation process

Before starting the machine tool, check whether the electrical control system of the machine tool is normal, whether the lubrication system is smooth, whether the oil quality is good, and add enough lubricating oil according to the requirements, whether the operating handles are correct, whether the workpiece, fixture and cutter are firmly clamped, whether the coolant is sufficient, and then drive the machine slowly for 3-5 minutes to check whether the transmission parts are normal, After confirming that there is no fault, it can be used normally

3. After the program debugging is completed, it must be approved by the instructor before it can be operated step by step. Those who operate without the permission of the instructor or violate the rules and regulations, and the score is zero, causing the accident, shall be punished according to the relevant regulations and compensate for the corresponding losses

Before machining parts, it is necessary to strictly check whether the origin of machine tool and tool data are normal, and carry out simulation operation without cutting path

7. Tool setting is the most important operation content of tool setting step in machining center, and its accuracy will directly affect the machining accuracy of parts. The tool setting method must adapt to the machining accuracy requirements of parts. This paper systematically describes the use of common tool setting methods of CNC milling machine (machining center) and their advantages and disadvantages, which has a certain practical value. The purpose of tool setting is to determine the position of the workpiece coordinate system origin (program origin) in the machine coordinate system through the tool or tool setting tool, and input the tool setting data to the corresponding storage location or set through G92 command. It is the most important operation content in NC machining, and its accuracy will directly affect the machining accuracy of parts< First, tool setting steps of machining center - positioning and clamping of workpiece (preparatory work before tool setting)

the commonly used fixtures on CNC milling machine are flat nosed pliers, dividing head, three jaw self centering chuck and platform fixture, etc., and the flat nosed pliers are generally used to clamp the workpiece in economical CNC milling machine. Install the flat tongs on the center of the working table of the milling machine, align and fix the flat tongs. According to the height of the workpiece, put the iron pad with appropriate shape and good surface quality into the flat tongs jaw, and then put the workpiece. Generally, the reference surface of the workpiece is facing down, close to the iron pad surface, and then tighten the flat tongs< (1) determination of tool setting point tool setting point is the reference point used to determine the position of the workpiece coordinate system in the machine coordinate system after the workpiece is positioned and clamped on the machine tool. The tool setting point can be selected on the workpiece or the clamping positioning element, but the tool setting point and the workpiece coordinate point must have an accurate, reasonable and simple position corresponding relationship, which is convenient to calculate the position of the origin of the workpiece coordinate system on the machine tool. Generally speaking, the tool setting point should coincide with the origin of the workpiece coordinate system< (2) the determination of tool change point

in the milling machine or machining center using a variety of tools, the tool needs to be changed frequently ring workpiece processing, and the tool change point should be determined according to the principle that the tool does not touch the workpiece, fixture and machine tool ring tool change< 3. Tool setting steps of machining center - common tool setting methods of CNC milling machine tool setting operation is divided into x, y and Z direction. The accuracy of tool setting will directly affect the machining accuracy. The tool setting method must adapt to the machining accuracy requirements of parts

according to the different tool used, the common tool setting methods are as follows: (1) trial cutting tool setting method 2) Tool alignment of feeler gauge, standard mandrel and block gauge 3) Edge finder, eccentric bar and z-axis setter are used for tool alignment 4) Top of the knife 5) Dial indicator (or dial indicator) knife method 6) Special tool setting device. In addition, it can be divided into unilateral tool setting, bilateral tool setting, transfer (indirect) tool setting and "center to zero" tool setting according to the location of tool setting point and data calculation method.

8. You use the absolute tool setting mode, the mechanical coordinate value of each tool is input into the corresponding length compensation, and the height difference between the tool setting point and the workpiece coordinate system position is input into the workpiece coordinate system Z (the value is 0 when the tool is set at the workpiece coordinate system position).
there is also the relative tool setting mode, and the length of the reference tool (the mechanical coordinate value) is input into the workpiece coordinate system Z, The difference (relative coordinate) between other tool lengths and reference tool lengths is input into the corresponding length compensation.

9. Harbin Xianfeng company has an automatic measurement proct, which is to set the workpiece coordinate system. It's very easy to use. I've used it before. His home phone number is 0451-82293947. Tell them the problems you want to solve, and they will give you suggestions or answers

10. At the beginning, that is, the first operation, it is sure to set the tool one by one, but I don't know whether you are talking about turning center or milling center. The difference between the two is that there is a tool setting device in the car, the tool touches the tool setting device, and the tool compensation is automatically input; When milling, it is touching the workpiece to be processed, and the value is to be modified and compensated manually.