What are the surface treatment methods of injection mold parts?
The processing analysis of various surface of injection mold parts mainly includes: processing analysis of external surface, processing analysis of molding surface, processing analysis of structural surface, etc.
The processing of all kinds of die parts starts from the processing of the surface of the form surface and lays a foundation for the subsequent processing of the surface of the form and structure.In the design and processing of the blank of the die parts, the machining allowance of the surface should be appropriate, and the necessary heat treatment should be carried out first for the forging and casting blank to reduce the internal stress and deformation.
For the surface of the surface is planar processing, you can use beaded planer, planer and milling machine for planing and milling to remove most of the machining allowance.Generally, small planar multi - purpose milling machine milling, medium plane can be planed, and large planer planer, tuo door milling processing.In this way, the basic shape and size of the plane surface can be obtained.But this kind of processing, its surface is relatively rough, shape position accuracy is low.The required dimensions and precision need to be achieved by subsequent surface grinding.
For the outer surface of the cylinder or cone, such as the core of the plastic mold, it is made by multi-purpose lathe turning.For large quality and large size mold parts, can be placed on the stand car processing, so that easy to find and ensure accuracy.For medium and small rotary body parts, the use of general lathe processing, for the bus as rotary body parts, the use of imitation lathe processing.
The processing and forming surface of parliamentary molding surface is the most difficult part in mold parts processing. It is one of the key points in mold technology.This is because its shape is complex, the size precision, the shape position precision, the surface roughness are relatively high requirements, and there are more heat treatment requirements on this surface.As for the processing method of forming surface, it can be divided into the following three categories according to different processing mechanism.
A. Machining this is cutting by mechanical means. It is the oldest, most basic and most widely used processing method.
B. Special processing, which USES electric energy, heat energy, light energy and chemical energy as the power to process, is a new and promising processing method, which is used more and more frequently.
[C] special processing. This process is made by precision casting, extrusion molding and superplastic molding. It shows unique advantages under certain conditions.
The forming surface is directly in contact with the surface of the plastic melt, so it requires high dimensional precision and surface roughness.Therefore, the processing of the molding surface can be carried out in two steps. The first step is the dimension processing.Second, through surface finishing, the surface of the molding surface to meet the surface roughness and shape precision required by the drawings, thereby finishing the processing of the molding surface.
The machining structure surface of the machining structure surface is mostly in simple geometric shape, such as plane, inclined plane, cone surface, cylinder surface, through groove, half through groove, step hole, etc.They can be realized by using general metal cutting machine tools.But among them to milling machine used more.For large and medium-sized plate parts, when there are non-circular holes on the top, it is used for milling with vertical milling cutter, and the four walls are connected by circular arc.For stepped square hole, special-shaped hole and square-shaped and special-shaped blind hole, it is necessary to use vertical milling cutter for milling.For the larger non-circular hole on the template, it can also be cut by the slotting machine. However, the pre-hole should be processed in advance to facilitate the cutting of the insert knife.The four sides can be connected at right angles after cutting.
For structure on the surface of the processing, on its process arrangement, should have a carefully consider, because the mould as a whole, therefore should consider the consistency of the parts and other related parts and coordination, which requires throughout the global, comprehensive arrangement.Some parts of the surface of the structure can be done in the processing stage, and some parts of the surface of the structure must be in the assembly stage to carry on the processing, want to consider the benchmark of relationships between different parts, to ensure the consistency of related parts.
© parting surface processing parting surface is the surface of the plastic mould in cannot little, is the combination of dynamic model and fixed die surface, also requires high accuracy plane.
A. The fractal plane has the fractal plane of a single plane, the fractal plane of a sharp Angle plane, the fractal plane of a step plane, and the fractal plane of a two-dimensional surface and a three-dimensional surface.For a single plane fractal plane, it is itself part of the surface.All complex fractal surfaces except single plane fractal surfaces are part of the forming surface.
B. The requirements for the parting surface require that there is a good fit between the dynamic module and the fixed module, which must be strict.For this reason, all types of surface must be grinding.
C. The processing of the parting surface is generally arranged after the processing of the outer surface. For the processing of a single plane parting surface, it can be processed by the general cutting method.For the processing of complex fractal surfaces, the outline and cutting process can be carried out after the surface bending process, and then the precision machining or special machining can be carried out according to its specific conditions.