Home appliance mold manufacturing process
One. Mold orders and requirements
Our data received from the customer: Parts of finished drawings and CAD data models, molds used in the injection molding machine, cavity number, type of plastic. Before making mold design should also understand some of the other factors:
How to specify a plastics molding characteristics?
Forming part number that is expected to molding cycles?
Products with where and how to use?
Do you want to make the same products with other parts?
Gating system type?
Gate location, flow and weld lines, the top of the mark?
Performance injection molding machine is suitable: plastics injection volume of tonnage capacity???
Die project cycle? Mold T1 date?
Two: three-dimensional product design and mold design
Die structure design is to produce a qualified mold premise. Our professional technical staff will carry out a full range of products and mold structure analysis, including:
1). Parting line position and finishing precision meets the needs of flash will not happen, if we were able to ensure that mold plastic mold parts remain in the top of one side of the device.
2) stripping the correct way to promote the rod, push tube size, location, quantity is appropriate, push plates will not be stuck in the core, it will not cause abrasions molded parts.
3). Mold temperature conditioning. Heater power, number; cooling medium flow line location, size, quantity is appropriate.
4). The method of processing plastic parts made concave side, off the side of the concave body is appropriate, such as bevel pillar core pulling the slider and the putter is interfering with each other.
5) casting, location of the exhaust system, the size is appropriate.
Three: the properties of the plastic material and the mold material selection
General appliances plastic mold products selected materials: ABS, PP, PC, POM, nylon.
ABS resin comprising the impact strength, mechanical strength, chemical resistance, heat resistance, dimensional stability, easy processing and other properties, is also relatively inexpensive industrial materials. The main purpose is to create TV shell, juice machine, automobile instrument case, the former guard grid box, car air conditioner housing.
PP molecular structure specifications, neat, for the balance of the polymer, a high degree of crystallinity, heat resistance and strength are superior.
PC is a colorless or light yellow material, tensile strength, flexural strength, flexibility, impact resistance are large, these physical properties can compete with the metal material. And these properties do not vary much change due to temperature, can still maintain the strength at 140 °. Helmets can be made and various mechanical parts, and the need for housing electrical insulator, strength, heat resistance, transparency, dimensional stability, resistance to mechanical vibration of the electrical appliance parts.
POM is excellent in heat resistance and solvent tough material. High heat distortion temperature, excellent abrasion resistance, long load is not easy to deformation, but after repeated bending, its nature is almost unchanged. Can be used in the manufacture of automotive parts, and other gear.
Common mold steel selection: 45 #, 40Cr, P20,2738,2316,718, 718H, NAK80, S136 and so on. General Appliance Mould can choose P20,718, S136, NAK80 other materials. Customers can choose according to their own requirements.
Four: three-dimensional molds and manufacturing audits
Designed three-dimensional molds need to be approved before production.
Die mainly by moving mold and fixed mold composed of movable die mounted on the moving plate injection molding machine, will be mounted on the mounting plate injection molding machines, injection molding, die after moving and fixed mold cavity and pouring constitute closure systems. When the mold is separated from the movable mold plastic parts to stay in the side, and then set the ejection mechanism movable mold plastic parts.
Mold manufacturing need more procedures, including: cutting, EDM, wire cutting, high-speed finishing, drilling.
After the completion of processing mold, by a professional mold master mold installation.
Five: Die tryout
After completion of the mold assembly fitter, factory inspection, mold testing whether preliminary obviously does not meet the design requirements of the phenomenon. Our injection mold factory inspection is divided into six parts, namely injection molding system, the slider system, ejection system, hot and cold media access systems, positioning systems and other areas. Each requiring self-test and review.
In this, we have to remind two points: First, mold designers and manufacturing technicians sometimes mistakes happen, when we test mode if the alert may be due to small errors arising from significant damage. Second, the results of the test mode is to ensure smooth production in the future. If the tryout process did not take reasonable steps to follow and make the appropriate records, which can not guarantee the smooth production time.
Keep all records tryout sample inspection process, including the processing cycle pressures, melt and mold temperature, barrel temperature, the emission time period, such as a screw feeder, in short, should be saved for all future help in order to be able to successfully establish a data processing conditions of the same, in order to get in line with the quality standards.
Six: Die Maintenance
Mold maintenance is more important than mold maintenance, mold maintenance, the more times shorter its life; and mold maintenance, the better, its life will be longer. Mold maintenance three main points:
1. Routine maintenance of the mold: the various moving parts such as thimble, line position, guide posts, guide sleeve refueling, clean the mold surface, carrying water sparse Road, which is a day when the mold production to be maintained;
2. Regular maintenance: regular maintenance beyond routine maintenance should include cleaning exhaust ducts, charred bits plus trapped gas exhaust, damage, wear parts and other amendments;
3. Exterior maintenance: the outer mold base coat of paint to prevent rust, when the lower die, will die dynamic model should be coated with anti-rust oil, should die to save the closed tight, to prevent dust from entering the cavity.
When we die shipped with a set of wearing parts, such as: mold mandrel, slider, faucets, plug, etc. are to be configured, and that is our complimentary, other parts will not be a problem under normal circumstances We also presented a mold maintenance manual, allowing you to better injection molding.