FR-4 is a code for the grade of fire-resistant materials, which means that the resin material must be able to exti...
FR-4 is a code for the grade of fire-resistant materials, which means that the resin material must be able to extinguish itself after burning. It is not a material name, but a material grade.
Therefore, there are many types of FR-4 grade materials used in general circuit boards at present, but most of them are made of so-called Tera-Function epoxy resin plus filler and glass fiber. Composite materials.
Before making fr4 epoxy fixture, let us understand the characteristics of fr4 epoxy board: fr4 epoxy board is a kind of substrate with epoxy resin as adhesive and electronic grade glass fiber cloth as reinforcement material. Its bonding sheet and inner core thin copper clad laminate are important substrates for making multilayer printed circuit boards.
The mechanical properties, dimensional stability, impact resistance and moisture resistance of fr4 epoxy board are higher than that of paper substrates. It has excellent electrical performance, high working temperature, and its performance is less affected by the environment. In terms of processing technology, it has great advantages over other resin glass cloth substrates. This kind of product is mainly used for double-sided PCB, and the amount is large. Epoxy glass fiber cloth substrate, the most widely used product model is FR-4. In recent years, due to the development of electronic product mounting technology and PCB technology, high Tg fr4 products have appeared.
The fr4 epoxy fixture is a device used to fix the processed object during the mechanical manufacturing process so that it occupies the correct position to accept construction or inspection. Also known as clamps. Broadly speaking, in any process in the process, the device used to quickly, conveniently and safely install the workpiece can be called a fixture. For example, welding fixtures, inspection fixtures, assembly fixtures, machine tool fixtures, etc.
Among them, machine tool fixtures are the most common, often referred to as fixtures. When processing a workpiece on a machine tool, in order to make the surface of the workpiece meet the technical requirements of the size, geometry, and mutual position accuracy with other surfaces specified in the drawing, the workpiece must be installed (positioned) and clamped (clamped) before processing . The fixture usually consists of a positioning element (to determine the correct position of the workpiece in the fixture), a clamping device, a tool guide element (to determine the relative position of the dao tool and the workpiece or the direction of the guide tool), and an indexing device (to make the workpiece installed in one time It can complete the processing of several workstations, including two types of rotary indexing devices and linear moving indexing devices), connecting elements and clamps (fixture base).