Application of contour cutting in mold processing
UGCAM has the following characteristics:
Provide a reliable and accurate tool path.
Can be processed directly on surfaces and solids.
A good user interface allows the user to customize the user interface according to the needs of the work, which not only improves the efficiency of the work, but also makes good use of and saves the company's Konw-how.
Provides a variety of processing methods to facilitate NC programmers to design a variety of efficient tool paths.
Provide complete tool library and processing parameter library management functions, so that new personnel can make full use of the experience of experienced personnel to design excellent tool paths.
Provides general-purpose post-processing functions to generate NC programs for each NC machine.
UGCAM includes two-axis to five-axis milling, ó bed milling, wire cutting, large tool magazine management, solid analog cutting and general-purpose post-processors. In this paper, the author will introduce the application of the medium-high cutting of the boring milling in the mold processing.
Contour cutting
Contour cutting is used in mold processing and is mainly used under processing conditions that require uniform tool force. For example, in rough machining, the tool is generally subjected to a large force, so the contour cutting can limit the force of the tool to a range by controlling the cutting depth. In addition, in the middle machining or finishing, if the machining part is too steep, too deep, and it is necessary to lengthen the lengthening of the blade, since the tool is too long when the yaw is too large, it is often necessary to use a constant cutting method to reduce the tool. Force. The most popular high-speed cutting machine is also the user of contour cutting.
UG's contour cutting function not only provides a variety of processing methods, but also allows the tool to make the fastest and best cutting under uniform force conditions throughout the machining process. The following are the characteristics of UG contour cutting.
There is no limit to the use of the tool
According to the performance of the machine tool, the material of the blank, the clamping method and the cutting efficiency, the NC programmer can freely use the flat knife, the ball knife, the round nose knife, the T-knife and other tools for the same height cutting. In terms of calculation, UG uses the selected tool, and the layer is calculated along the machining plane, so it can produce an accurate tool path. Figures 1 and 2 show the tool path cut with a T-knife, and Figure 3 shows the tool path cut with a flat knife (the thin line is the tool path).
Automatically detect the undercut area (undercut )
UG automatically detects undercut areas within the machining range and automatically calculates the optimum tool path. As shown in Figure 2, when milling with a T-knife, if the shank does not interfere with the machined surface, UG will do the most complete cutting possible. In Fig. 3, since the cutting is performed with a flat knife, in the undercut area, the tool path generated by the UG is based on the principle that the entire tool does not hit the machined surface.
Provide a variety of tool path types
UG contour cutting is used for double cutting, one-way cutting, spiral cutting, edge cutting and multi-layer edge cutting. Among them, multi-layer edge cutting provides a high efficiency raw billet processing path, which is also a good choice for deep and steep processing surface finishing. High-speed cutting machines can take advantage of this feature to create a good machining path. Figure 4 is a multi-layer cutting tool path along the edge. A ramp tool path is generated at each depth, the first pass is 3 mm from the finished face, and the second pass is 1 mm from the finished face, and the first pass is machined on the finished face.
Produce a uniform machining path for the tool
When the mold is being machined, the NC programmer or the machine operator often avoids the excessive force of the tool in the NC program, which causes the tool to be seriously worn out, which reduces the feed rate of the overall path and affects the entire machining. effectiveness. UG provides a variety of feed rate setting methods to solve this problem. The user can set the feed rate of the tool's local force (such as the first cutting, the tool path reciprocating, the tool path corner)
Set different depths of cut in different height areas
In order to leave a uniform billet after processing, no unnecessary processing time is required. The UG provides the user with different depths of cut in different height regions depending on the shape characteristics of the workpiece. As shown in Fig. 5, when processing in a multi-layered surface, we set a larger cutting depth in the steep region and a smaller cutting depth in the gentle region.
With the concept of processing materials and finished products
The processing material and the operation of the finished product allow the user to conveniently perform the calculation of contour roughing and finishing without modifying the CAD model. It is very convenient for the NC program of the mold electrode and slider. In Fig. 6 and Fig. 7, the dotted line portion is the shape of the processed material, Fig. 6 is an example of roughing with a reciprocating contour, and Fig. 7 is a tool path for contouring along the surface.
With tolerance cutting function
The CAD data received by the mold maker is often the IGES file provided upstream. Therefore, there is often a gap and overlap between the curved surfaces of the CAD model for machining. UG provides a tolerance cutting function. The gaps and overlap between the surfaces can be automatically processed within the tolerance range set by the user, resulting in a good tool path.
Different processing allowances can be set on individual machining surfaces
In the mold design, due to the specification of the finished geometric shape, it is often necessary to define different meat thickness, mold surface, broken surface and general finished surface. In order for the NC programmer to set the NC program on a single CAD model, UG allows the NC designer to set different reservations (positive and negative) on the individual machining surfaces to improve the design efficiency of the NC program.
Provide a variety of ways to enter / retract
UG contour cutting provides a variety of in/out retracting methods such as straight lines, broken lines, and arcs to meet the needs of actual machining. The user can also set different pre-drilling positions and drilling depths in different depth areas or machining areas. UG can also automatically determine the pre-drilling or diagonal feeding according to the machining geometry and tool definition during the infeed to meet the actual machining requirements.
in conclusion
The above is the application of UG contour cutting on the mold. In the future, the author will introduce the most vivid projection processing processing in UGCAM, the problem of middle processing, finishing and automatic clearing.