WoodWork CNC Machining
We found that many customers have requirements for special materials. According to the design, these special materials need CNC processing. Because the CNC processing methods of the two are similar, we have specially equipped CNC equipment suitable for bamboo and wood processing.
Although there is little difference in processing methods, we have to study and accumulate rich experience in this field in order to pursue the material characteristics of bamboo and wood. Now we have been able to complete the production of complex bamboo and wood products in terms of material selection, process formulation, surface treatment, post-treatment.
What we use bamboo and wood materials to produce is not handicrafts, but parts. This requires higher processing accuracy and stability than ordinary handicrafts, which means that we do not produce bamboo and wood products in the usual sense, but bamboo and wood components.
What Bamboo Wood Can Be Made for?
Basically, parts made of bammboo wood can be used in many industries. These include:
1. mechanical parts
2. electronic product shell
3. furniture product parts
4. ship high-speed rail components
5. medical device product parts
6. aircraft components
What Is Bamboo / Wood Production Precedure?
The production process of wood products generally includes material cutting, manual or mechanical processing, gluing and pressing, assembly and decoration. Sometimes it also includes drying and heating of wood. The composition of the general processing of wood products is shown as below.
This article will briefly introduce the key points of several procedures in the process of wood products fabrication and processing.
1. Material preparation
A wood product is composed of several components, and the specifications, dimensions and materials of these components are usually different. According to the dimension and quality requirements specified in the drawing. The process of cutting raw materials or man-made board into raw materials of various specifications is called material preparation. This is the first process of woodwork processing.
During material preparation, the technical indication such as tree species, texture, specification and moisture content of the materials used for each component shall be reasonably determined according to the quality requirements of the product and the different positions of the components on the product. At the same time, during sawing, the specification of sawn timber or man-made board must be reasonably selected according to the machining allowance value to be left in the next step, so as to make full use of materials and improve production efficiency.
According to statistics. In the production of wooden products, the volume consumed by machining allowance accounts for about 12% of the volume consumed, accounting for about 5% ~ 6% of the total product cost. Excessive machining allowance caused by improper material preparation will not only consume more materials, but also increase the consumption of processing equipment and energy, and reduce production efficiency.
Therefore, material selection and preparation in the whole process is a key issue that can not be ignored.
Wood material must be dried before processing so as to meet the use moisture requirements, and whole product structures become firm, flat, beautiful and durable.
Drying can not only improve the wood parts’ machinability and mechanical properties, but also avoid the erosion of wood rot fungi, prevent deterioration and decay. In addition, the weight of
wood can be reduced after drying, therefore, easy to transport.
Wood changes constantly in the drying process due to its own properties and moisture content. If the shrinkage is uneven, or, the tangential shrinkage is inconsistent with the radial
shrinkage. In this way, the original size of the wood is changed or deformed, warping, twisting, and even cracking. Therefore, a proper drying method should be selected according to the tree
species and size.
The drying methods of wood can be divided into two categories: atmospheric drying and artificial drying.
Natural drying is to dry wood under natural conditions such as flowing air and sunlight. This method requires simple equipment, easy to operate and low cost, but requires a large drying site and a long time. And affected by the change of natural conditions. Drying quality is sometimes difficult to guarantee.
Manual drying can shorten the drying cycle of wood, but it needs drying devices. Manual drying includes kiln drying, infrared drying, high-frequency dielectric drying, microwave drying, solar
drying and other methods.
3. Machining Of Components
Machining of components refers to the further processing of the raw materials obtained by material cutting to have the correct geometric shape and section size, and the final finishing of the surface by polishing and sanding.
1) Machining of datum and relative surfaces
In order to obtain the correct shape, size and smooth surface of components, and ensure the accurate positioning of subsequent machining, it is necessary to process the reference surface of raw materials.
It is the dimension datum for subsequent machining. Datum surface includes plane (large surface), side (small surface) and end face, etc. The datum plane can be machined by hand or on a planer or milling machine.
After the datum surface is machined, other surfaces can be machined based on the datum surface. So as to finally obtain the wood parts that are flat, smooth and conform to the shape and size specifications of the technical requirements.
(2) Machining of tenon and mortise hole
Tenon is one of the most common basic combination way in woodwork structures. If such a combined part is adopted, related parts must be provided with tenons and mortise holes respectively.
The tenon processing quality directly affects the bonding strength and performance quality of finish products. Tenon is the machining datum and assembly standard of subsequent processing, which ensures the finished parts and products can achieve initial required machining accuracy.
According to the structural assembly drawing of wood products and design, the process of combining several components into parts, or combining several components and parts into wood products is called assembly.
Wood products with simple structure and production process can be directly assembled into finished products from components. For more complex wood products, the components need to be assembled into parts, which can be finally assembled into wood products after glue is cured and then repairing or processing.
5. Surface finishing of wood products
After the wood products are made, the surface needs to be painted and colored to improve the surface quality and anti-corrosion and enhance the aesthetic appearance. The surface finishing of wood products usually includes wood surface treatment, coloring and painting.
(1) Surface treatment
The surface treatment depends on the content and purpose of the operation process, including the removal of dirt, glue marks, wear debris, turpentine, cracks, holes, pits and other defects on the wood surface.
(2) Wood coloring
Wood coloring usually refers to the surface treatment for transparent decoration on the surface to maintain the effect of wood grain texture. This is one of the main decorative means of wood products. The common application of coloring is to apply water powder or oil powder on the surface after cleaning, greasy leveling and sanding.
(3) Finishing paint
After the surface treatment of wood products is completed, the primer and finish can be painted by hand or spraying.
According to the needs of surface decoration and color design, the top coat can be paint or varnish. Alkyd resin paint and amino resin paint have better decorative performance, and phenolic resin paint has better protective performance.
There are many kinds of topcoats available for wood products. When selecting the finish paint, relative grade of paint variety shall be selected according to the requirements of the decorative quality of wood products.