In the application process of multi-axis machining centers, the support of CAM software is indispensable, but in the post-processing production process, there are many different ways of adopting different software. Moreover, the post-processing customization process is cumbersome and requires some practical application experience. Here, I share some of the experience accumulated in my work.
There are many types of CAM software. Here we use EdgeCAM as an example, because this software is more commonly used in our work, and there are many unique features in the post-processing production. It is relatively easy to grasp. In the post-processing production process, it is first necessary to understand the structure type of the machine tool and the characteristics of the control system. These technical conditions are very important. Due to the different structures of the five-axis machine tools, there are many contents to be considered when making post-processing. There are many types of processing control systems, and the processing methods of different control systems are also different, causing a huge bottleneck in the current five-axis applications.
First of all, let's take a look at the type of five-axis machine tool. Five-axis machine tools are people's popular names. To be precise, it should be called a five-axis linkage machine tool. Its motion structure is achieved by three translational coordinates plus two rotation coordinates. According to the configuration of the rotational coordinate of the five-axis machine tool, generally speaking, it can be divided into three categories: a double-turntable machine tool (two rotary work tables stacked together), a double-swinging machine tool, a single-turntable plus a single-swinging machine tool. Each machine tool has its own characteristics and scope of application. The double turntable machine tool has a simple structure and good rigidity. It is a widely used structural model, but this type of equipment is generally not too large; the structure of double swinging machine tool is the most complex but rigid. Lower, limited travel, generally used in large-scale equipment such as gantry milling machines; Single turret single pendulum head equipment performance is in between the two, so it is widely used, whether it is large, medium and small equipment, has this structure. When the machine tools of different structures are processed after configuration, the coordinate conversion relationship is different. For example, the equipment of a double turntable is divided into 24 types according to the manner of the movement of each coordinate axis, and there are also 24 types of double-swinging heads. There are also 48 kinds of table swinging heads. In summary, there are nearly 100 types of five-axis machine tools. Coupled with different types of control systems, post-processing production will be very large. I recently found a good tool is -EdgeCAM. Let's take a look at the production process of five-axis post-processing in EdgeCAM.
In EdgeCAM, configuring multi-coordinate post-processing is very simple. You can complete the post-processing production by using the software's own Code Wizard tool. No longer need to write more code. It's the easiest post-processing method I've ever seen. Simply select the configuration of the machine and add a standard template. Make a few changes. Avoiding complex coordinate transformations and other computational content, the fly in the ointment is the application of post-processing template intelligence in the EdgeCAM environment. The following figure is the initial page for configuring the post-processing template of the dual-turntable device in the CodeWizard environment.
After selecting these contents, half of the post-processing work was completed. After the selected template is determined, it enters the parameter setting page, and its content category is exactly the same as the three-axis post-processing. Its page is as follows:
In the machine structure page, set the reference type of the five-axis coordinate and the output mode of the rotation coordinate.
Generally do not make any changes first, compile the application directly, and then observe whether the format of the generated NC code meets the needs. There is no need to care about how the coordinate system changes, the relative positional relationship between the workpiece and the tool, etc. We used this tool to successfully fabricate the five-axis post-processing of the Siemens 840D double-swing head and the Heidenhain 530i single-swing single-swing head. And put into production,
The following is the post-processing application of the Siemens 840D double-pendulum head. Let's take a look at the generated program sample:
There are two things worth noting here. One is the application of three-dimensional tool length compensation. The Siemens 840D control system can achieve three-dimensional tool length and radius compensation. The other is that in the program that does not set the G93 time count feed, EdgeCAM can automatically adjust the feed rate according to the curvature.
The other is the application of the five-coordinate post-processing of the single-swing single-swing head Heidenhain TNC530i control system. We are very interested in the vector output method provided by EdgeCAM, so we used the IJK vector output method to make a post-processing, and the generated sample program. as follows:
This program uses a special rotation coordinate output method, not everyone is familiar with the ABC angle output. Not all control systems can recognize this vector program. This program only gives the direction of the tool axis vector relative to the part to be machined. How the rotation axis rotates is completely passed to the control system (such programs Similar to the pre-files generated by many CAM software). The premise is that the distance from the tool tip to the swivel center must be given in the tool length compensation address. It can be seen that with the development of the hardware of the control system, five-axis programming will be more and more simple.
to sum up
The production of five-axis post-processing has become a complicated task due to the difference in machine structure, but in EdgeCAM, this process has become very simple, and the scope of application is also very extensive. The differences in machine structure and control systems are no longer the main concerns of post-processing. We only need to pay attention to the format of the program. And these can be achieved by choosing a similar standard template to get more default parameters.
Note: All the sample programs used in this article are verified by the actual machining of the machine tool. Due to space limitations, they cannot be listed in full. Please do a mock test.
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NOTE:
1. Please contact the corresponding product engineer for specific torque products.
2. Max. rotation speed: 50r/min
3. Max. circle rate: Clockwise180 °, 180 ° anti-clockwise for 1 cycle
4. Operating temperature: -10~50℃
5. Storage temperature:-30~60℃
Applied torque:(T)
Test Temperature:23+/-5℃
Rotating speed:20r/min
Durability test Method:Clockwise 180 °, 180 ° anti-clockwise
Rotating speed:20r/min
Test Frequency:1cycle/min
Test Temperature:23±5℃
Durability test cycle:10000 cycle
Test result criteria: Store in the room temperature for 24 hours or more after the test, recording to the torque T=T±30%T.
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