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Modern panel furniture, which is generally referred to as KD (knock Down) disassembly and assembly furniture and RTA (Ready-To-Assemble) furniture to be installed, the structural characteristics of its products are the combination of standard parts and interfaces (hardware). The dimensional error of each standard component, including the machining of the cutting part, is required to be controlled at 0. l within the range of 0.3mm, thus meeting the technical standards of product interchangeability and versatility. The products are no longer shipped, sold and sold in one piece, but are shipped to the market in brand new box packaging. This production method greatly shortens the processing cycle of products, and has produced fundamental changes in the storage and transportation of products, thereby enhancing the competitiveness of products.
The design of modern panel furniture requires comprehensive consideration of processing technology, equipment capabilities, and high-precision quality standards. Specifically, for each piece of furniture, no matter what its three-dimensional scale is, it should adopt a detailed design that decomposes piece by piece. As large as a side plate, as small as a small support, you should design detailed specifications, eyelet spacing, and formulate technical process parameters. The application of FCAD has greatly increased the speed of the above design.
The design of modern panel furniture ensures the implementation and quality of mechanical processing of products. Regardless of whether it is a straight panel furniture or an art panel furniture, the structural design of its components should be carried out in accordance with the above requirements. Otherwise, it is difficult to achieve the continuous processing requirements of panel furniture on modern equipment and the control of process technology standards.
The core of modern panel furniture production is to realize the processing of standard parts. The high-precision processing of parts must be completed by modern special hydraulic machinery equipment.
The components of modern panel furniture are classified according to structure, and can be generally divided into two categories: solid panel components and hollow panel components.
The processing technology of modern panel furniture mainly includes: preparation (or blanking), veneer (finish), machining, finishing, and assembly. In addition, it can also include product inspection and warehousing and transportation after packaging.
Machining process flow of decorative particleboard components:
1. Plain blanking
The particle board and MDF board (hereinafter referred to as artificial board) used as the base material for processing board furniture must first meet the quality standards. The quality inspection standards can be carried out in accordance with GB4896-4905 and the international "medium density fiberboard" standard. The production and processing of modern panel furniture have strict requirements on the thickness specifications, surface flatness and intrinsic quality of man-made panels. The thickness tolerance standard should be controlled at 0.3mm of soil; the allowable tolerance of length and width specifications is 0 ~ 5mm.
When cutting a plain board, the operator should first carefully read the comprehensive drawing of the board cutting and the related supporting size cutting table for processing. At present, domestic advanced cutting machines mainly include automatic feeding saws or standard guide saws.
(1) Where the veneer-based panel used by a panel furniture manufacturer belongs to the unit for secondary veneer processing, the processing allowance for the length of the plain plate components is generally set to 10 to 15 mm; the width processing allowance is 8 to 12mm.
(2) When the large-format plain board enters the saw, it should rise and fall flat, and each time the material is opened, it should not exceed two layers. The difference between the size and head of the panel after manual sawing should be less than 2mm. When the length L of the plate is: 1000mm <L <2500mm, the allowable tolerance is 2mm (the limit deviation is ± lmm). When the length of the plate L <1000mm, the processing tolerance is lmm (the limit deviation is ± 0.5mm) .. com6cG6G ^ 8T9Ol [0C
(3) The sawn boards should be stacked in a dry place. Generally, about 50 layers are allowed to be stacked in each cargo space. At the same time, the process card must be filled in clearly and accurately to facilitate the continued processing of the next process and the production planner ’s Planning, scheduling and management.
2. Sanding
Thickness sanding of plate parts is also called correction sanding. Regardless of the thickness specifications of the wood-based panels purchased, in principle, fixed-size correction sanding should be generally applied to large-format or after-cut specifications. The special equipment for walking thick sanding includes broadband sanding machine or three-roller sanding machine.
(1) Panel sanding is one of the more important processes in the production of panel furniture. The equipment requirements are relatively high. For example, the broadband sanding machine of Italian DMC company is a more advanced sanding equipment, which has higher processing accuracy and larger processing volume. , The feeding speed is preferably 8 ～ 12m.
(2) For constant thickness sanding, the sanding amount on both sides of the man-made board is required to be balanced to ensure the surface and internal quality of the substrate and to facilitate the subsequent secondary processing of the surface.
(3) In sanding, it is required that the amount of single-sided sanding should not exceed 1mm each time, and the thickness tolerance of the sanded board should be controlled within the range of 0.1mm.
(4) The fixed-thickness sanding machine uses 60-80 grit abrasive belt for sanding, and the effect is relatively ideal.
3. Decorative veneer
The plain board parts in front of the decoration stickers are inspected one by one by the quality inspector to check whether the board quality meets the technical requirements of the veneer processing to ensure that the sanded wood-based board parts are smooth, smooth, free of cracks, defects and unevenness Claim.
At present, domestic wood-based panel decorative veneer mainly uses ALKORCELL, PVC, decorative wood grain printing paper, melamine veneer, and advanced sliced ​​veneer materials.
The technology of decorative veneer on the surface of artificial board will be introduced in the follow-up.
4. Milling
Plate milling is also called milling. The standard shape and size of the edge of the panel furniture parts are processed by double-end milling equipment. The double-end milling of plate parts is usually completed in two steps. The general method is to process the longitudinal edges first, and then enter the milling processing of the lateral edges. The main points of its processing and main technical standards are as follows:
(1) When operating double-end milling, the thickness specifications, length and width specifications required by the design drawings of the parts and components should be adjusted reasonably; the scale of the pressing device and the pressure roller should usually be lmm smaller than the thickness of the plate. At the same time, the drilling position of the parts should be combined to determine the pros and cons of their processing.
(2) Adjust the ratio of double-end milling according to the processing accuracy and specifications of parts. The general experience is that the machining allowance on each side is generally 2 to 3 mm. The cutting amount in the longitudinal direction is 4 to 10 mm; the cutting amount in the width direction is 4 to 6 mm.
(3) The cutting depth of the scribe saw to the processed parts is generally 3 to 5 mm
(4) The digital display of double-end milling can be used only when adjusting the width and size of the parts, and it must be turned off when processing the parts, so as not to affect the service life of the equipment and the quality of the board processing
(5) The allowable tolerance for the length and width of the processed parts is ± 0.1 mm to 0.3 mm; the allowable tolerance per meter for the two diagonals of the component is less than 1 mm.
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