EDM processing: bevels and grooves of molds

author: Universe plastic

2024-10-21

In the manufacturing process of injection molds, the processing of bevels and grooves has always been one of the key steps. These structures determine the precision of the mold in production, its surface finish, and the appearance and functionality of the final product. In traditional machining methods, machining bevels and grooves can require complex processes and multiple operations.

With the introduction of EDM (electrical discharge machining) technology, the efficiency of mold bevel and groove processing has been greatly improved, and the accuracy has been significantly improved. Universe Plastic Engineers will provide an in-depth introduction to the advantages, applications, and design and operation details of EDM processing in injection molds.

Advantages of EDM processing mold bevels and grooves

1. High-precision and complex shape processing

The distinctive feature of EDM processing is its ability to achieve extremely high precision. Especially in the processing of complex shapes, EDM is unparalleled. The bevels and grooves of molds usually require precise angle and size control, and traditional machining may cause errors due to tool wear, vibration and other reasons. EDM uses electrodes for non-contact processing, which avoids errors caused by physical contact and can achieve micron-level accuracy.

2. Processing of difficult-to-cut materials

When processing some high-hardness mold materials (such as quenched steel, titanium alloys, etc.), traditional cutting tools may be severely worn due to excessive hardness, or even be unable to process effectively. EDM technology is not limited by material hardness and can easily process high-hardness and difficult-to-cut materials. Therefore, EDM is an ideal processing method for mold parts that require high wear resistance, such as bevels and grooves.

3. Processing efficiency and cost advantages

Although the speed of EDM processing may be slightly slower than some high-speed cutting processing methods, its feature of reducing multiple processing steps on complex structural parts can actually save the total production time. In addition, EDM can reduce the frequency of tool use and replacement, reducing additional costs caused by tool wear.

4. Low surface roughness

EDM processing enables very smooth surfaces, especially in the bevels and grooves of molds, and surface finish is a key factor in ensuring a flawless surface on the final product. The high precision of EDM allows it to achieve lower surface roughness, which is of great help to subsequent polishing processes and can also directly reduce polishing steps.

Comparison with traditional bevel and groove methods of machining molds

1. No tool loss

Mechanical processing uses tools for cutting, while EDM melts materials through spark discharge without tool contact, so there is no problem of tool wear.

2. Advantages of complex geometric shapes

EDM can easily handle complex shapes that are difficult to achieve with machining, especially internal structures, deep cavities, fine grooves, etc.

3. Materials have wide adaptability

Mechanical processing has more restrictions on materials with higher hardness, while EDM can process a wide range of soft materials to super-hard materials.

EDM operations and design details of mold bevels and grooves

1. Electrode design

Electrodes are the core components in EDM processing. Depending on the design of the mold, the shape and size of the electrodes must be very precise. For bevel and groove machining, the electrode needs to match the designed slope or groove depth. This often requires precision design with the help of CAD/CAM software to ensure that the shape of the electrode perfectly replicates the intended structure of the mold.

2. Processing parameter settings

The processing effect of EDM is closely related to discharge current, pulse frequency and processing speed. For the bevels and grooves of the mold, especially the parts that require high surface finish, the processing parameters need to be optimized based on the material properties and target accuracy. For example, a smaller pulse current can reduce the material's erosion rate but improve the surface finish.

3. Discharge gap and cooling system

During processing, it is crucial to maintain a proper discharge gap. A gap that is too small may cause a short circuit or damage the electrode, while a gap that is too large will affect processing accuracy and surface finish. In addition, a large amount of heat is generated during EDM processing, so an effective cooling system can help maintain the temperature balance of the electrode and mold to prevent deformation or loss of accuracy.

Application of EDM processing mold bevels and grooves

1. Slider and inclined roof processing

The slider and inclined top used for mold demoulding often have complex geometries and slopes, and EDM can ensure the accuracy and smoothness of these parts.

2. Cooling water tank processing

The cooling water tank in the injection mold is usually designed as a deep cavity structure, and EDM can effectively process these inaccessible areas.

3. High-precision small groove processing

In mold design, some tiny grooves or channels are used to achieve the function or design requirements of plastic parts. EDM can easily complete this precision processing task.

Summarize

EDM processing technology has become the preferred method for processing mold bevels and grooves due to its superiority in processing complex shapes and high-hardness materials. Compared with traditional machining, EDM can achieve higher precision, better surface quality, and demonstrate excellent performance in the processing of complex geometries. For customers who need to customize injection molds and mold processing professionals, the use of EDM processing technology can undoubtedly improve the quality and production efficiency of molds.

Dongguan Universe Plastic Factory has more than 15 years of experience in EDM processing of injection molds. It has a professional team and advanced EDM processing equipment to provide high-quality and cost-effective mold manufacturing services.

If you are looking for an EDM mold manufacturer, welcome to contact us for the latest service information!

EDM processing: complex shaped electrodes

Injection molding machine type: two-color injection molding machine