what is the injection?injection molding is to put plastic granules into the heating barrel of the injection machine. The plastic is heated and melted. Under the push of the injection machine screw or plunger, the nozzle and the mold casting system enter the mold cavity and harden the styling due to physical and chemical action. Become an injection molded product. Injection molding consists of a cycle consisting of injection, pressure holding (cooling) and plastic part demolding, so that injection molding has periodic characteristics.
Thermoplastic injection molding has a short molding cycle, high production efficiency, and low wear of the melt to the mold. It can form large-sized plastic parts with complex shapes, clear surface patterns and high marks.
Injection molding machine
Injection molding machines can be divided into vertical, horizontal, right-angle, rotary and eccentric according to their shape characteristics. Currently, horizontal type is most commonly used. According to the way in which the engineering plastics are melted and plasticized in the cylinder, there are two types of plungers and screws. The plunger type injection machine has little development in recent years due to its low plasticizing ability, difficulty in uniform plasticization, large injection pressure loss, and low injection speed. The most widely used is the reciprocating screw injection machine.
Mold
A tool that shapes a plastic (or polymer) into an article having a certain shape and size by its own specific shape is called a mold. The role of the mold is to impart a shape, impart strength and performance to the plastic during the molding process of the plastic, and to complete the work that the molding equipment cannot perform, making it a useful profile (or product). For the same molding method, molds with different principles and structural features are used; according to the forming method, the roots are divided into: pressing mold (pressing mold), die casting mold (transfer molding mold), hollow blow mold, vacuum or Pressure forming molds, extrusion dies (heads), injection molds, etc. The most important of these are extrusion dies and injection dies. The mold used for injection molding can be varied according to the structure of the product, the molding equipment and the nature of the raw materials. However, the basic structure is consistent. The injection mold is mainly composed of three parts: the casting system, the molding part and the structural part; the pouring system refers to the flow part of the plastic melt before entering the cavity from the nozzle. Including mainstream roads, runners, gates, etc. Molded parts refer to various parts constituting the shape of the product; including moving and fixed mold cavities, cores, vent holes, and the like. Structural parts refer to the various parts that make up the mold structure; including various parts that perform the actions of guiding, demoulding, sleeve core, and parting.
Detail information of mould steel
Mould material | mould hardness | mould life |
P20 | HRC 29-33 | 300000 shot |
H13 | HRC >43 | 1000000 shot |
718 | HRC 30-36 | 500000 shot |
S136 | HRC 48-52 | 50000 shot |
2344 | HRC >48 | 800000 shot |
FAQ
Q: Does your company make mould by yourself?
A: Yes, we are manufacturer with about 15 years of molding experience.
Q: What type of information is required for quoting a molding project?
A: We'll need more specifics like the quantity needed, material preference, part prints or CAD files, part samples (if available), description of part application, including UV exposure, chemical resistance, FDA requirements,time frame for production parts.
Q:What types of molding services do you offer?
A: We design the mold for production, make the mold, and run production parts.
Q: What material should I use for my project?
A: Most material is application specific. If you don't have a material selected for your application, we can help and offer some guidance. Often several resins can be sampled but the customer has final approval before proceeding.
Q: What is the typical process of a new project?
A: We will evaluate your part design and modify it to be efficiently injection molded. Then, we will build the mold for the part. Next, your mold will be put into an injection molding press to make production parts. On average the entire process takes 4-7 weeks.
Q: How long does it take to build an injection mold?
A: 4-7 weeks on average, depending on the complexity and cavitations of the mold.
Q: What's the software you will use to check the drawing? And what's format of drawing you can check?
A: Our designers and engineers all use AUTO CAD and Soliworks software to check 2D and 3D drawings.
We can check the drawings with PDF, AI, DWG (CAD) and STP (3D) or IGS (3D) formats.
Q: Will you send me the free sample?
A: Yes, We will send free sample to you.
Q: How to pack the moulds and products?
A: For moulds, we will be coated one-layer anti-rust oil first, and then also will be covered thin films on the mould, finally pack into non-fumigation wooden case.And as to products, we will pack into standard export cartons or as per customer's request to pack.
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