Cutting Molds
Cutting molds are specialized tools used in manufacturing processes to cut materials into specific shapes or sizes. These molds work by applying pressure or shearing force to a material using a sharp blade or cutting edge to create the desired shape. These molds can create straight cuts, curved cuts, perforations, embossing, and intricate shapes in materials, providing precision, repeatability, efficiency, and versatility in manufacturing processes. Cutting molds are commonly made of high-quality materials like tool steel or carbide to withstand the cutting forces involved in manufacturing operations. Industries such as automotive, aerospace, textiles, and packaging utilize cutting molds for various cutting and shaping operations.
Advantages of Cutting Molds
Precision
Cutting molds can create precise and accurate cuts in materials, ensuring consistency in the final products.
Efficiency
Using cutting molds can speed up the cutting process, leading to increased production rates and reduced manufacturing time.
Versatility
Cutting molds can be customized to create a wide range of shapes, sizes, and designs, making them versatile for various manufacturing applications.
Cost-effectiveness
Cutting molds can help reduce material waste by cutting materials with minimal scrap, leading to cost savings in production.
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Quality control
From raw material procurement to production inspection to market entry, every process and every link is assigned responsibility to every employee and strictly follows. Each batch of goods has a corresponding quality inspection report to solve your concerns about product quality.
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We have gathered many design, research, and manufacturing professional and technical personnel, and constantly cultivate and improve the quality and skills of employees, so that each employee has a sense of belonging and mission, maintains the strongest sense of responsibility in their respective positions, and maximizes their potential.
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Cutting Molds Processing Process
During machining by wire cutting machine, the current density in the discharge area is as high as 10000a / mm2 and the temperature is as high as 10000 ℃ – 12000 ℃. The injected medium liquid cools sharply, resulting in the surface hardness of the cutting surface being only about 20hrc, while the hardness of the internal quenching layer is more than 70hrc, followed by the heat affected zone and then the original hardness zone. In particular, the internal of raw materials is in a tensile stress state due to quenching, and the thermal stress generated by wire cutting is also a tensile stress. The superposition of the two stresses can easily reach the strength limit of the material and produce microcracks, which greatly shortens the service life of the die. Therefore, wire cutting cannot be used as the final processing process of punch and die.
At present, most injection molding enterprises assemble and use after removing the gray and white layer (i.e. white layer) of 20hrc on the surface by grinding after on-line cutting. Although this can remove the white layer with low hardness, it does not change the stress state of the stress area caused by wire cutting. Even if the grinding allowance after wire cutting is increased, it is difficult to grind due to the high hardness of the high hard layer (up to 70hrc), and excessive grinding amount is easy to damage the part geometry. Therefore, the high hardness layer produced by wire cutting can not improve the service life of the die, because its brittleness is caused by cracks The root cause of blade collapse.
Grinding after WEDM can remove the low hardness white layer and high hardness layer and improve the service life of the die. Because the thermal stress generated during grinding is also tensile stress, superposition with the thermal stress generated by wire cutting will undoubtedly aggravate die damage. If low temperature aging treatment is carried out after grinding, the influence of stress can be eliminated, the toughness of die can be significantly improved, and the service life of die can be improved. Because most of the dies with complex geometry are processed by wire cutting, the expensive coordinate grinder and optical curve grinder must be used to grind the dies with complex shape. Generally, the wire cutting manufacturers do not have these two kinds of equipment, so it is difficult to popularize them.
In high-speed WEDM, working fluid is the medium of pulse discharge, which has a great influence on the machining. The working fluid is generally required to have certain insulation performance, good washing performance, good cooling performance, no pollution to the environment and no harm to human body. The configuration of working fluid is also very important. If it is too thick or too light, it will cause wire breakage. Generally, the concentration ratio of water to liquid is in the range of 1:10 to 1:20. When the cutting speed is required to be high or the workpiece with large thickness is cut, the concentration shall be appropriately lower, so that the processing is more stable and it is not easy to break the wire. However, the working fluid concentration should not be too low. Otherwise, the insulation performance of the working fluid will be reduced, the resistivity will be reduced, and the cooling capacity will be enhanced, thus reducing the lubrication effect on the workpiece, which is not conducive to chip removal and wire breakage.
In order to ensure that the working fluid channel is not blocked, the flow of working fluid should also be properly controlled. Generally, when cutting is completed, the cutting section of the workpiece sags under the action of working fluid, the cutting part falls off, and the electrode wire is very easy to be clamped off. At this time, the working fluid should maintain a certain pressure and flow, and the corrosive substances should be discharged in time, so as to prevent wire breakage. When cutting aluminum, copper and other soft materials, especially when the cutting materials are relatively thick, in order to improve the processing efficiency and surface finish and reduce wire breakage, some special coolants can be used, which is also conducive to environmental protection.
The Importance of Tool Selection When Cutting Molds
Cutting molds sounds simple enough: Using a sharp knife and a simple tool, such as a can opener or a pair of vise grips, the mold maker separates a rubber mold into two halves, allowing the model and subsequent waxes to be removed. But like so many seemingly simple tasks, there are intricacies to cutting a successful mold that go well beyond cutting the block of rubber into two parts.
In addition to ensuring that delicate waxes can be removed without distortion, the mold cutter must cut the mold in such a way that the two halves will match up perfectly time after time, and the injected wax will fill well and require minimal cleanup. In addition, there is no one right way to cut a mold. The only true measure of success is whether the mold produces consistent waxes that can be removed without distortion, and with any given mold there are multiple ways of achieving that goal. A technique that works for one mold cutter may be awkward or difficult for another, and an approach that works for one design may produce less desirable results on another.
If it sounds like a tall order, it is, and even veteran mold cutters may have to cut several molds for a difficult design before finding one that works perfectly. Knowing the tools and tricks used by experienced mold makers can reduce the number of failed attempts, however, and make it more likely the mold will give up the wax without a struggle. To properly cut a mold, you need the right tools for the job. The only tools that are absolutely required for cutting molds are a cutting instrument and something to hold the rubber as it is peeled back. These can vary from scalpels and can openers to curved cutting blades and specially designed mold holding systems. Choosing a tool is largely a matter of individual preference rather than a question of right versus wrong.
The key consideration in the cutting instrument is that it must be sharp-very, very sharp. When you use sharper blades, the molds fit together better. If you look at the cut of a dull blade, it's very coarse. You want a smooth surface where the two layers of rubber come in contact. This tool is still used successfully by many cutters today. They also have the option of using vise-style clamps that mount on the side of the bench. Cuts from sharp cutting tools are a perennial hazard for mold cutters, and one that cannot be completely eliminated. But ways to reduce the frequency include using sharp blades, which are replaced as soon as they become even slightly dull; wearing a puncture-resistant safety glove on the hand holding the mold; and keeping fingers out of the path of the blade. Consider using magnification when cutting molds, one thing that can take your cutting molds to the next level is using magnification. Under magnification you can really be accurate in creating the optimal parting line [the line cut around the model to separate the two halves of the mold.
The primary considerations when deciding on a mold material don't usually include the ease in cutting it. The complexity of the mold, the detail involved, and whether the model can stand up to the heat of vulcanizing are all factors that will determine whether mold makers choose materials with greater or lesser tear strength and greater or lesser hardness, and steer them toward heat or room-temperature vulcanizing options. But there are occasions when the demands of cutting the mold will help determine the type of mold material used. For example, complex cutting molds that need spiral-cut cores require high tear strength and lend themselves to natural rubbers, which generally offer greater strength than silicone rubbers.
However, silicone rubbers have improved greatly in this area over the years, and in some cases come very close to the tear strength of natural rubber.
For very complex cutting molds that need highly precise parting lines, the mold maker may choose a transparent RTV (room-temperature vulcanizing) material, which allows him to see the location of the model in the mold as he cuts. Although this material would seem like the obvious choice for all cutting molds, there are factors to consider besides visibility for ease of cutting: they include tear strength, mold life, and cost. Even when the material is chosen for considerations other than cutting, the mold cutter needs to be aware of the material's cutting qualities. Keep in mind, as well, that properly preparing the mold can make a difference when it comes time to cut it. When you heat-cure a mold, the big thing is not to over cook it, and make sure the temperature is right. That makes the cutting properties fairly consistent.
Cutting Molds Is Crucial for the Final Result
The two processes of hot and cold vulcanization are very different. Compared to cold vulcanization, the use of hot vulcanization makes it possible to produce rubber cutting cutting molds that perform better and are more durable. As a result, the rubbers will be free of micro-bubbles and traces of moisture, will remain durable and resistant over time even after many uses, and will retain the right degree of elasticity.
Once the rubber cutting mold has been vulcanized with the metal master inside, we move on to cutting mold cutting. The aim of this step is to remove the part inside and prepare the cutting mold for injection. Always bear in mind that the quality of the cut is crucial for the next steps. The model must be removed with the utmost care to maintain its exact shape. It is very important that the cut is not regular, but full of angles and recesses. In this way, the two parts of the cutting mold will close perfectly and hold their position without slipping during injection. The wax will fill all the cavities without any risk of spilling.
At the beginning of the process, we incise the cutting mold following the previously traced line only on the outer part of the rubber, without going too deep.The cutting mold is clamped on all four sides of the front part, on the side where the wax will be injected. The cutting mold remains secured and does not "yield" to stress from the cut, ensuring maximum precision. The mould can be rotated as required, ensuring maximum maneuverability, visibility of the working area and operator comfort. At this point, we deepen the incision in the rubber, step by step and with the utmost care.
We collect the master and continue to open the cutting mold until only a few centimeters are left on the backside. The cutting mold should not be split in half but should remain attached at the rear to facilitate wax injection and ensure a perfect closure.Once the cutting mold is ready, we remove it from the rubber opener, and we are ready to start with the wax injection. The injectors create a vacuum in the cutting mold and fill it with molten wax. The rubber cutting cutting molds filled with wax are moved to the coolers. Once the shape has solidified, the cutting cutting molds are opened, and the wax models are extracted. The wax models are attached to a wax tree, which is immersed in a plaster solution. The plaster forms a shell around the tree, which is then put in an oven, and the melted wax flows out. The molten metal is poured into the plaster shell, filling all the cavities left by the melted wax. The plaster is opened, the forms are collected, and they undergo further mechanical processing or surface finishing. In the lost-wax casting process, machinery plays a crucial role.
Injectors, coolers, pumps, and vulcanizers must be state-of-the-art to ensure quality results and optimize production costs. However, the skills of the operator are also extremely important, especially in a delicate procedure such as cutting mold cutting.
FAQ
Q: How does a cutting mold work?
Q: What materials are cutting molds typically made of?
Q: What industries use cutting molds?
Q: What are the advantages of using cutting molds?
Q: How are cutting molds different from other types of molds?
Q: What factors should be considered when designing a cutting mold?
Q: How can the lifespan of a cutting mold be extended?
Q: What safety precautions should be taken when using cutting molds?
Q: Can cutting molds be customized for specific applications?
Q: What is the difference between a cutting mold and a trimming die?
Q: How can the efficiency of cutting molds be improved?
Q: What are common maintenance practices for cutting molds?
Q: Can cutting molds be used for high-precision cutting operations?
Q: What are the different types of cutting methods used in cutting molds?
Q: How are cutting molds manufactured?
Q: What are the key components of a cutting mold?
Q: Can cutting molds be used for both manual and automated cutting operations?
Q: How can the accuracy of cutting molds be ensured?
Q: Are there different types of cutting edges used in cutting molds?
Q: How can cutting molds contribute to cost savings in manufacturing processes?