The quality of a die casting mold is determined by the technology used in its manufacturing
Many different parts go into making a die casting mold. When it comes to the quality of the parts, the quality of the mold is directly related to the quality of the parts. The finishing process also ensures the final quality of the parts, making it critical to maintain tight control over the process. Grinding, electrical machining, and fitter treatment are commonly used in the finishing stage of mold production in most domestic die casting mold manufacturing facilities. Deformation, internal stress, shape tolerance, and dimensional accuracy of parts are all important technical parameters to keep under control during this stage. Although there are numerous operational difficulties in the specific production practice, there are also numerous effective experiences and methods that are worth learning.
The processing of mold parts is guided by a general guiding ideology that accommodates a variety of materials, shapes, and technical requirements. Mold parts have a certain degree of plasticity that can be controlled to achieve a satisfactory processing result. Generally speaking, parts can be divided into three categories based on their different shapes: shafts, plates, and custom-shaped parts. According to the standard procedure, it goes like this: fine grinding, electrical machining, fitter surface treatment, and assembly processing are all examples of processes that are used in rough machining, heat treatment, quenching, and tempering.
Die casting mold parts that have been heated
Although it is necessary to control the internal stress of parts during the heat treatment process to ensure that they retain their dimensional stability during processing, it is also necessary to control the hardness of the parts. Treatment methods for different materials are diverse and complex. Increasingly diverse materials are being used in the mold industry as the industry develops. Due to its high working strength and extreme tensile strength, powder alloy steel can be used for punch and mold production. Material with high thermal stability as well as a good microstructure is what we are talking about.
The treatment of quenchingThe residual stress in the workpiece after quenching is high after rough machining, and this can easily lead to cracking in the finishing or work process. Following quenching, the parts should be tempered while still hot in order to eliminate quenching stress. . Workpieces with numerous corners and complex shapes are encountered in the manufacturing process, and tempering is insufficient to eliminate quenching stress. Stress relief annealing or multiple aging treatment are required before the project can be completed to ensure that all stress has been released completely and effectively. Despite the fact that powder alloy steel is expensive, its performance is excellent, and it is becoming increasingly popular in a variety of applications. .
Die casting mold parts are ground down to a smooth finish in a grinding machine
Surface grinders, internal and external grinders, and tool grinders are the three most common types of machine tools used in grinding applications. Grinding deformation and grinding cracks should be strictly controlled during the finishing grinding process to ensure that the final product meets the desired finish. Even the tiniest cracks will be exposed during the following processing. So the fine grinding speed should be small, not high, the coolant should be sufficient, and parts with tight tolerances should be used for production. A constant temperature should be maintained as much as possible during the grinding of mm. Calculations show that when the temperature difference between mm long steel parts is 40 degrees Celsius, the material has a specific temperature difference M,. = deformation per mm of length. When it comes to finishing processes, the impact of this factor should be fully considered.
Electronic data acquisition (EDA) management
It is impossible to run a modern mold factory without using electrical machining. Electrical machining can be used to process all types of special-shaped parts with high hardness, and it is classified into two categories: wire cutting and EDM.
Precision in machining is achieved by using WEDM, with roughness measured in micrometers (Mm) and measured in millimeters (mm). Check the condition of the machine tool before processing begins, as well as the deionization degree of the water, the temperature of the water, the perpendicularity of the wire, the tension, and other factors, to ensure that the processing is in good working order at the outset. When dealing with stress concentration in machining, the vector translation principle can be applied. Approximately one millimeter is left before finishing, and the rough shape is pre-processed before the heat treatment is carried out, allowing the machining stress to be released first before finishing, thereby improving thermal stability.
It is necessary to fabricate an electrode prior to performing EDM, which can be classified as coarse or fine. It is necessary to calculate the gap and the number of electrodes before constructing the electrode. Large area or heavy electrode processing should be carried out with the workpiece and electrode securely clamped to ensure sufficient strength and prevent loose processing from taking place. Attention should be paid during deep step machining to the loss of electrodes as well as the arc discharge caused by insufficient drainage.
In addition to lowering the number of parts that are out of tolerance and scrap, good finishing process control can increase the first success rate and service life of a die casting mold by a significant margin.
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