A method for manufacturing a glued bamboo bent round rod with uniform appearance

Abstract

The invention discloses a method for manufacturing a glued bamboo curved round rod with uniform appearance, which relates to the field of bamboo product processing, and comprises the following steps: firstly, bamboo is processed into bamboo strips, and then the bamboo strips are hot-pressed into bamboo rods with square and rectangular cross sections respectively, and then the two bamboo rods are processed into thin slices, and after drying, the two thin slices are glued and bent into bamboo rods with square cross sections, and then polished, sanded and painted to obtain a glued bamboo curved round rod with uniform appearance. The glued bamboo curved round rod manufactured by the method of the invention has high strength and rigidity, and is suitable for manufacturing various bamboo products with high load requirements. The method has a simple manufacturing process and flexible operation, and can effectively control the curvature of the round rod, prevent the bending and breaking of the bamboo curved round rod, and improve the service life of the bamboo products.

Description

Technical Field

[0001] The invention relates to the field of bamboo product processing, in particular to a method for manufacturing a glued bamboo bent round rod with uniform appearance. Background Art

[0002] Glued bamboo round bars are natural, environmentally friendly and high in strength. The bamboo material has been fumigated at high temperature, desugared and defatted, sterilized and sterilized, and pressed tightly inside and outside to achieve high gluing strength. The diameter of the bamboo round bars is available in a variety of specifications, corresponding to a variety of different bamboo square bars. The length, width, thickness and other specifications of the product can be customized. And it can be widely used in architectural decoration and as a handle for tools. It is healthy and environmentally friendly, cost-effective, stable in performance, and customizable to meet the needs of different users.

[0003] However, most of the existing glued bamboo round bars are straight-through products, and there is a lack of corresponding curved round bars on the market, which makes this type of product unable to meet various customized needs, such as the manufacturing needs of complex curved components, and faces challenges in different usage scenarios. Since most of the existing glued bamboo products are made by gluing thin bamboo strips together, the gap spacing and texture between the bamboo strips will be uneven during the process of processing the square bamboo sticks into round bamboo sticks, which will affect the surface appearance of the bamboo products. In addition, most of the existing press-bending of glued wood and glued bamboo uses customized clamps. In order to reduce costs and improve efficiency. This type of glued wood and glued bamboo press-bending components usually have a large volume and are not suitable for certain specific usage scenarios.

[0004] Therefore, technicians in this field are committed to developing a method for making a glued bamboo bent round rod with a uniform appearance, which can be beneficial for manufacturing complex arc-shaped components, reducing the uneven surface gap spacing, and using a small three-point bending mold, which is particularly suitable for small bending glued bamboo tools. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problems to be solved by the present invention are that the straight bamboo round rod is not suitable for arc-shaped components, the surface gaps of traditional glued bamboo are uneven after rounding, and the current large-scale bending fixture is not suitable for small-sized bent glued bamboo.

[0006] To achieve the above object, the present invention provides a method for manufacturing a glued bamboo round bar with uniform appearance, which specifically comprises the following steps:

[0007] Step 1: Cut the bamboo into bamboo strips with a length of 1000mm and a rectangular cross-section;

[0008] Step 2, arranging the cross-sections of the bamboo strips into a square, and then hot-pressing and gluing them, and obtaining a first bamboo pole after the hot-pressing is completed;

[0009] Step 3, arranging the cross-sections of the bamboo strips into a rectangular shape, and then hot-pressing and gluing them together to obtain a second bamboo pole;

[0010] Step 4, cutting the first bamboo pole into first thin slices of a certain thickness in parallel along the cross-sectional length direction of the bamboo strip, and then artificially drying;

[0011] Step 5, cutting the second bamboo rod into second thin slices of a certain thickness in parallel along the cross-sectional width direction of the bamboo strip, and then artificially drying;

[0012] Step 6, arranging the first thin slices dried in step 4 in parallel in the middle along the thickness direction, placing the two second thin slices dried in step 5 on both sides respectively, the cross section of the first thin slice and the second thin slice is a square, and obtaining a third bamboo pole by cold pressing, gluing and bending;

[0013] Step 7: Use a trimmer to grind each corner of the third bamboo pole bent in step 6 into an arc angle with a radius the same as the required circular cross-section, perform sanding, and then paint.

[0014] Furthermore, the cross-sectional dimensions of the rectangular bamboo strip in step 1 are 20 mm in length and 6 mm in width.

[0015] Furthermore, the cross-sectional size of the first bamboo pole in step 2 is 60×60 mm.

[0016] Furthermore, in step 3, the cross-sectional size of the second bamboo pole is 20×60 mm, and the number of layers of the bamboo strips is single.

[0017] Furthermore, in step 4, the thickness of the first sheet is 5-8 mm.

[0018] Furthermore, in step 5, the thickness of the second sheet is 3-4 mm.

[0019] Furthermore, the moisture content after artificial drying in step 4 and step 5 is 8-10%.

[0020] Furthermore, the first thin sheet in step 4 and the second thin sheet in step 5 are processed using a high-precision planer after drying to form a precise and smooth gluing surface.

[0021] Furthermore, the cross-sectional size of the third bamboo pole in step 6 is 60×60 mm.

[0022] Furthermore, the bending in step 6 is performed by using a glued bamboo fixture and adopting a three-point positioning method to determine the arc of the bending, that is, to determine the chord height and chord length of the bending.

[0023] In a preferred embodiment of the present invention, the selection of bamboo strips of 6×20 mm specifications can ensure that a certain number of bamboo strips can be selected to form a plywood with a square cross-section, and no additional processing steps are required to ensure that its cross-section is definitely square. The reason why the number of bamboo strips of the second bamboo pole is a single layer is that the single-layer plywood produced in this step is used as a veneer on both sides of the bamboo component along the cross-sectional direction in the next step to correct the texture of the bamboo component and ensure the consistency of the texture gaps on the four visible surfaces of the bamboo component.

[0024] In another preferred embodiment of the present invention, the specific operation steps of artificially drying bamboo are as follows:

[0025] 1. Place the bamboo poles in a cool and dry place.

[0026] 2. Stack the bamboo poles into a small pile, making sure there is enough space between each pole to allow air circulation.

[0027] 3. During the drying process, check the moisture content of the bamboo poles regularly. If there are water droplets on the surface of the bamboo poles, the bamboo poles need to be moved to a cooler place. If the surface of the bamboo poles is dry, the bamboo poles need to be moved to a sunnier place to speed up the drying process. When the moisture content of the bamboo poles drops to a suitable level, the bamboo poles can be placed in a storage room or shed for further drying.

[0028] 4. During the drying process, be careful to prevent the bamboo poles from being exposed to rain or moisture to avoid rot.

[0029] It should be noted that the drying time of bamboo poles depends on the thickness of the bamboo poles, humidity and ambient temperature. Generally, bamboo poles need at least 1-2 weeks to dry completely.

[0030] Glulam bamboo clamp is a tool used to fix and connect gluelam bamboo components. It usually consists of multiple wooden blocks and bolts, which can fix gluelam bamboo components together to form a stable structure.

[0031] Glued bamboo fixtures usually consist of the following components:

[0032] 1. Main splint: Its length, width and thickness are usually determined according to needs, and the two sides of the splint are fixed by multiple metal clamps.

[0033] 2. Foot: Its length, width and thickness are usually determined according to needs. One side of the foot is connected to the main splint and the other side is fixed by multiple metal clamps.

[0034] 3. Tie rod: usually made of steel or metal, connected to the main plate and feet by bolts.

[0035] 4. Fasteners such as bolts: used to connect tie rods and splints, usually made of high-strength threaded steel.

[0036] Compared with large clamps, the advantages of glued bamboo clamps are:

[0037] 1. Lightweight and easy to operate: Made of bamboo, the new glued bamboo clamp is lighter and easier to operate than traditional steel clamps.

[0038] 2. Good stability: The new glued bamboo clamp has a simple structural design and uses high-quality glued bamboo materials, which has good compressive resistance and stability.

[0039] 3. Low manufacturing cost: The new glued bamboo clamp has low manufacturing cost and is easy to manufacture and repair.

[0040] The three-point positioning method can determine the arc of the bend, that is, determine the chord height and chord length of the bend. The basic steps of this method are as follows:

[0041] 1. At the center of the bend, touch the surface of the sheet with a tool and record the location of the touch point. This point is the center of the bend.

[0042] 2. At the two ends of the bend, touch the surface of the sheet again and record the locations of the touch points. These two points are the end points of the bend.

[0043] 3. Use trigonometric calculation method to calculate the chord height and chord length of the bending according to the distance relationship between the center of the circle, the end points and the thickness of the plate.

[0044] When using the three-point positioning method to determine the curvature of the bend, the precision and accuracy of the measurement must be ensured to avoid inaccurate calculation results due to errors.

[0045] In another preferred embodiment of the present invention, various environmentally friendly adhesives can be used during gluing, so that the bamboo products have good environmental performance.

[0046] Compared with the prior art, the present invention has the following beneficial technical effects:

[0047] 1. The present invention reduces the uneven surface gaps to a certain extent by cutting the bamboo poles into slices of different thicknesses and then reassembling, gluing and bending them. This method can ensure that the color and texture gaps of the four visible surfaces of the newly pressed bamboo poles are consistent, thereby ensuring that the color and texture of the cut handrails are as uniform as possible in the circumferential direction.

[0048] 2. The present invention uses high pressure and temperature to press the glued bamboo poles into an arc shape. The assembled and glued bamboo poles will be placed in a mold and pressed into a desired shape by pressure. Subsequently, the bamboo poles will be cured under high temperature and high pressure conditions to keep them in an arc state. The assembled bamboo poles are first bent and then planed into a circular cross-section to ensure that the cross-section of the arc-shaped component is circular. The advantage of this method is that it can produce arc-shaped bamboo components with high strength and stability, can quickly and accurately trim and chamfer the components, and is suitable for processing bamboo components of various types and specifications.

[0049] 3. The present invention uses a glued bamboo fixture to manufacture small curved glued bamboo by a three-point bending method. This glued bamboo fixture is particularly suitable for the manufacture of arc-shaped round handrail components. The small curved glued bamboo component manufactured by this method can effectively control the curvature of the round rod, has high strength and stability, can effectively prevent the occurrence of bending and breaking of the bamboo round rod, and improve the service life of the bamboo product.

[0050] 4. The method of the present invention has a simple manufacturing process, a small operation range, and is easy to master.

[0051] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of a production process of making a first thin sheet from a first bamboo pole in a preferred embodiment of the present invention;

[0053] Figure 2 It is a schematic diagram of a production process of making a second thin sheet from a second bamboo pole in a preferred embodiment of the present invention;

[0054] Figure 3 is a schematic diagram of a combined third bamboo pole of a preferred embodiment of the present invention;

[0055] Figure 4 The invention is a preferred embodiment of the invention in which the round cross section of the bamboo round rod is polished. DETAILED DESCRIPTION

[0056] The following describes several preferred embodiments of the present invention with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0057] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0058] Example 1

[0059] First, cut the bamboo into bamboo strips with a length of 1000mm, a cross-sectional width of 6mm, and a length of 20mm. Then take 30 bamboo strips and arrange the cross-sections of the 30 bamboo strips into a first bamboo pole with a cross-sectional size of 60×60mm, and perform hot pressing and gluing. After that, the hot pressed first bamboo pole is cut parallel to the length direction of the bamboo strip cross-section into first thin slices with a thickness of 5mm, a total of 12 slices. The production process of arranging the bamboo strips of the first bamboo pole and cutting them into the first thin slices is as follows: Figure 1 Then take 10 bamboo strips and arrange them in parallel to form a second bamboo pole with a cross-sectional size of 20×60 mm. The arrangement of the bamboo strips of the second bamboo pole is as follows: Figure 2 Afterwards, the hot pressed second bamboo pole is cut into second thin slices with a thickness of 4 mm in parallel along the width direction of the bamboo strip cross section, and a total of 5 second thin slices are obtained. The production process of arranging the bamboo strips of the second bamboo pole and cutting them into second thin slices is shown in FIG. Figure 2 As shown. After the first and second thin slices are cut, they need to be artificially dried to a moisture content of 10%, and processed into a precise and smooth gluing surface using a high-precision planer. Then, take 10 first thin slices and arrange them in parallel in the middle, take 2 second thin slices and place them on both sides, add glue, and combine them into a third bamboo pole with a cross-sectional size of 60×60mm, as shown. Figure 3 As shown. The third bamboo rod is cold-pressed and glued, and the three-point positioning method of the glued bamboo fixture is used to determine the arc of the bending, that is, the chord height and chord length of the bending. Finally, the bent component is polished by a trimming machine to each corner into an arc angle with the same radius as the required circular cross-section, and the grinding and sanding operations are completed, and subsequent work such as painting is completed. The circular cross-section of the final bamboo bent round rod is as shown Figure 4 shown.

[0060] Example 2

[0061] First, cut the bamboo into bamboo strips with a length of 1000mm, a cross-sectional width of 6mm, and a length of 20mm. Then take 30 bamboo strips and arrange the cross-sections of the 30 bamboo strips into a first bamboo pole with a cross-sectional size of 60×60mm, and perform hot pressing and gluing. After that, cut the hot pressed first bamboo pole parallel to the length direction of the bamboo strip cross-section into a first thin sheet with a thickness of 8mm, a total of 7 sheets. Then take 10 bamboo strips and arrange them in parallel into a second bamboo pole with a cross-sectional size of 20×60mm. The bamboo strips of the second bamboo pole are arranged as follows: Figure 2 As shown, hot pressing and gluing are performed. After that, the hot-pressed second bamboo pole is cut into a second thin slice with a thickness of 4 mm in parallel along the width direction of the bamboo strip cross section, and a total of 5 second thin slices are cut. After the first and second thin slices are cut, they need to be artificially dried to a moisture content of 8%, and a high-precision planer is used to process them into a precise and smooth gluing surface. Then, 6 first thin slices are taken and arranged in parallel in the middle, and 2 second thin slices are taken and placed on both sides respectively. After adding adhesive, the size is adjusted and combined into a third bamboo pole with a cross-sectional size of 60×60 mm. The third bamboo pole is cold-pressed and glued, and the curvature of the press bending is determined by the three-point positioning method of the glued bamboo fixture, that is, the chord height and chord length of the press bending are determined. Finally, the bent component is polished by a trimming machine to each corner into an arc angle with the same radius as the required circular cross section, and the polishing and sanding operations are completed, and the subsequent work such as painting is completed.

[0062] The arc-shaped round rod of the glued bamboo produced by the present invention has high strength and rigidity, and is suitable for making various bamboo products with high load requirements, such as bamboo chairs, bamboo beds, bamboo stools, etc. In the production process of the arc-shaped round rod of the glued bamboo, various environmentally friendly adhesives can be used, so that the bamboo products have good environmental performance. The production process of the arc-shaped round rod of the glued bamboo can effectively control the curvature of the round rod, so that the appearance of the bamboo products is neat and beautiful, and at the same time, it can effectively prevent the occurrence of bending, breaking and the like of the bamboo round rod, thereby improving the service life of the bamboo products. The production process of the arc-shaped round rod of the glued bamboo is simple, the operation is flexible, and it is easy to master. In the production process of the arc-shaped round rod of the glued bamboo, various environmentally friendly adhesives can be used, so that the bamboo products have good environmental performance.

[0063] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for producing a glued bamboo round bar with uniform appearance, characterized in that: The method comprises the following steps: Step 1: Cut the bamboo into bamboo strips with a length of 1000mm and a rectangular cross-section; Step 2, arranging the cross-sections of the bamboo strips into a square, and then hot-pressing and gluing them, and obtaining a first bamboo pole after the hot-pressing is completed; Step 3, arranging the cross-sections of the bamboo strips into a rectangular shape, and then hot-pressing and gluing them together to obtain a second bamboo pole; Step 4, cutting the first bamboo rod into first thin slices of a certain thickness in parallel along the length direction of the cross section of the bamboo strip, and then artificially drying; Step 5, cutting the second bamboo rod into second thin slices of a certain thickness in parallel along the cross-sectional width direction of the bamboo strip, and then artificially drying; Step 6, arranging the first thin slices dried in step 4 in parallel in the middle along the thickness direction, placing the two second thin slices dried in step 5 on both sides respectively, the cross section of the first thin slice and the second thin slice is a square, and obtaining a third bamboo pole by cold pressing, gluing and bending, wherein the bending is performed by using a gluing bamboo fixture and a three-point positioning method to determine the curvature of the bending, that is, determining the chord height and chord length of the bending; Step 7: Use a trimmer to grind each corner of the third bamboo pole bent in step 6 into an arc angle with a radius the same as the required circular cross-section, perform sanding, and then paint.

2. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: The cross-sectional dimensions of the rectangular bamboo strip in step 1 are 20 mm in length and 6 mm in width.

3. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: The cross-sectional size of the first bamboo pole in step 2 is 60×60 mm.

4. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: In step 3, the cross-sectional size of the second bamboo rod is 20×60 mm, and the number of layers of the rectangular bamboo strips is single.

5. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: In step 4, the thickness of the first sheet is 5-8 mm.

6. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: In step 5, the thickness of the second sheet is 3-4 mm.

7. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: The moisture content after artificial drying in step 4 and step 5 is 8-10%.

8. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: After drying, the first thin sheet in step 4 and the second thin sheet in step 5 are processed using a high-precision planer to form a precise and smooth gluing surface.

9. The method for making a glued bamboo round bar with uniform appearance as claimed in claim 1, characterized in that: The cross-sectional dimensions of the third bamboo pole described in step 6 are 60×60 mm.

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