I am not an audiophile. I am a fungus. Compared with the advanced technology of European brands, there are still big gaps in modern production, especially in the field of loudspeakers. Many on the Internet about acoustic theory! Unsatisfied, superficial talk about domestic speaker manufacturing process, does not make in-depth technical analysis.
The wide range of audio applications, professional areas (performance stage), KTV, public broadcasting, multimedia, home theater have a huge potential market. Many brands set up factories in Guangdong is a well-developed electronics industry, and a complete supply chain is inseparable. The cutting and processing of raw materials for composite cabinets, paint spraying, speaker manufacturing, and assembly finished products, and after passing the aging test, are sold out of the warehouse. It has a set of rigorous and perfect technological processes, and the manufacturing process is meticulous. Of course there is no shortage of fish.
A: The box of raw materials
The sound box material is generally: fiberboard, plywood, logs. Fiberboard can be boring, can be drilled, can be pitted, not easy to edge and other specialities to a certain extent better than solid wood, of course, have their own advantages.
The supplier provides fiberboards of different thicknesses and densities according to the manufacturer's requirements. Wood is a good example. Manufacturers buy a large quantity of wood from a wood company and the price is relatively low. Audio enthusiasts can also go to TB to purchase their own products. Different types of wood and fiberboard prices range from high to low. The first is to open the material, and the whole incoming fiberboard is cut into the required modules on the set electronic cutting board saw. The modules are then placed on the plate components that are precisely cut by the CNC to form the planar base of the housing.
Between the small parts and then fine processing of holes, grooves, repair 45 degree corners, etc., some models have to go through the special processing machine pattern, open before the material should not be wasted, there are many benefits can be Reinforce the cabinet. Due to the change of temperature in the north and the south, besides the use of glue, the box is also nailed, which splices the most basic model of the box.
One of the most commonly used glues in the box. Choose to use according to different locations.
Not all boxes are straight squares. How are some curved cabinets made? It is also very simple. The fiberboard is cut into wooden strips of a certain size. The glued glue is glued between the wooden strips. In order to maintain the continuity, a thin sheet is pressed on both sides. After the veneer coating, the stitching marks are not visible.
Solid wood, its original ecological characteristics are different from the large area of ​​fiberboard, so easy to operate. Log wood is naturally grown, and some of the cracks are normal. However, too many wormholes and too dark wood quality are not so good. The woodworker selectively cuts off part of the wood according to the cracking conditions of the edge of the wood. The rest can be cut into wood strips of a certain size. A layer of glue is brushed between the wood strips, and then the joints are fixed together in a clamper. In this way, a block of log wood is formed. Since wood flour and wood thorns are on the surface, the plate is polished and the plate is polished to achieve a smooth and smooth feel. Can make the color of the coating clear, clear wood grain; also can save finishing materials, improve the quality of the coating. Partially synthesized boxes need to be sanded by a belt machine for better results. There are also solid wood plywood and other parts have to be polished by hand with sandpaper, these steps are essential. The log box has the risk of being easily deformed and cracked in the wet environment, so the moisture content of the wood should be well controlled.
Polishing and sanding are distinguished by manual and machine. Some companies will improve their machines for their products to facilitate production.
Carpentry is a huge process, with a variety of tools, lathes, boring, planing and milling. The same is true of the "spraying" that follows.
Second: spray paint
Next, the surface of the empty box should be "sprayed" to make its appearance more aesthetic.
Adhesives Water repellent Preservatives Wood stains Desiccants Wood modifiers Formaldehyde Catalytic additives Flame retardants Wood coatings Other accessories. All kinds of materials, in addition to the appearance of the box, also play an internal anti-corrosion treatment, sealing.
The general surface of the box surface is: stickers, stickers rubber, veneer.
Stick rubber: Take a square subwoofer as an example. A rectangular fiberboard is first sprayed with white glue on a rectangular rubber surface with a watering can and then attached to a fiberboard. The surface is flattened and the air is squeezed out of the edge to cut excess with a blade. The edges of the rubber sheet and sandpaper are slightly ground, and then the interface of the fiberboard is processed into bevels or right-angled surfaces (45°+90°), which can be combined to form a square box (up, down, left, right, and four sides), and the inside of the box is connected. The use of some small wooden stick glue glue reinforcement, front and rear corresponding to the sticky panel to complete the subwoofer box.
Taking into account the characteristics of the subwoofer, in its internal addition of different thickness of wood to support the box body interface as far as possible are coated with a sealant, coated with a high damping material to increase the rigidity and sealing.
Stickers: Put the white plastic on the outside of the box, then the sticker (technical work), and then fill in the primer. Pay attention to the different positions to prevent the paper from being broken. Spray the paint - spray the varnish and polish, and repeatedly operate it until the surface of the box. Clear and bright lines are not damaged, especially the groove counterbore position. At the bottom of some speakers there is a lacquered cover.
Stick veneer: The glue is different from the previous white glue, after which it is used to paint a series of processes such as polishing the top paint and polishing, and after the finished product is a good-looking craftwork. Each speaker's PE primer frequency, the number of finishes have their own process standards, depending on the brightness of the paint, paint quality and performance to ensure that the electrostatic spraying process, coloring techniques, humidity, baking time and other details, hand Grinding machine or wood product polishing, grinding process. The application of "Depot" is also critical. There are many types of veneer, such as rosewood, walnut, ebony, rosewood, etc.
After processing and molding from raw materials, it is possible to assemble loudspeakers for sale after painting.
DIY enthusiasts often do bookshelf audio. The weight of the floor acoustics avoids resonance problems and makes the sound mellow and powerful. The internal acoustic maze eliminates noise, and the guide hole does not just open a position. Even if the closed speaker relates to the resonant frequency of the cabinet, the specific principle involves a lot, and the frequency divider needs to be designed for the corresponding unit and system. The overall acoustic design makes it difficult for ordinary fans to have these elements at the same time.
Essay one.
Rational consumption, pulling so many I still hear a few hundred blocks. Do not like not to spray! !