A bamboo wind instrument and a manufacturing method thereof
By splitting and reconstructing bamboo and precisely controlling the thickness ratio of the green and yellow layers of bamboo, combined with gradient drying and aging processes, the problem of material scarcity and high cost of bamboo wind instruments has been solved, achieving consistency in timbre and pitch, and meeting professional performance standards.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 黄晓云
- Filing Date
- 2026-05-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing bamboo wind instrument manufacturing techniques suffer from problems such as material scarcity, high cost, poor consistency in timbre and pitch, and difficulty in large-scale production. Furthermore, traditional materials cannot replicate the resonance effect and timbre texture of natural bamboo.
By splitting and reconstructing bamboo, precisely controlling the thickness ratio of the green and yellow layers of bamboo, and using low-viscosity two-component epoxy adhesive for bonding, combined with gradient drying and aging processes, bamboo wind instruments with uniform density are produced.
It has enabled the standardized and large-scale production of bamboo wind instruments, reduced planting and material selection costs, improved the consistency of tone and pitch, solved the cracking problem caused by internal stress, and met professional performance standards.
Smart Images
Figure CN122392461A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of musical instrument manufacturing, specifically relating to a bamboo wind instrument and its manufacturing method. Background Technology
[0002] Bamboo wind instruments such as the xiao, dizi, and shakuhachi are core categories in the traditional Chinese folk instrumental system, boasting a history spanning thousands of years. The acoustic performance and timbre of these resonant wind instruments depend primarily on the density distribution and resonance characteristics of the materials used in their construction. Natural bamboo, with its dual-density gradient structure consisting of a dense, hard outer layer of bamboo green and a looser, softer inner layer of bamboo yellow, combined with the synergistic resonance effect of its internal natural fibrous vessels, creates a resonance effect and tonal texture that cannot be replicated by other materials, making it the premier material for bamboo wind instrument making.
[0003] However, existing techniques for making wind instruments from natural bamboo still have the following problems:
[0004] First, traditional processes have strict requirements on the age, diameter, uniformity of inner and outer diameter, length of bamboo nodes, and density of bamboo. They require the selection of old bamboo that is more than 5 years old. Furthermore, the diameter, wall thickness, and density of natural bamboo are formed naturally. Suitable bamboo that meets both size and acoustic density requirements is extremely scarce, resulting in very low material utilization, inconsistent product quality, and an inability to achieve standardized and large-scale production.
[0005] Secondly, bamboo suitable for making musical instruments has extremely high requirements for the soil, terrain, and climate of its growing environment, and the suitable planting areas in China are limited. Moreover, bamboo needs to grow for more than 5 years before it can be used to make instruments. Bamboo planted for the first 2 years can only be used for seed saving, and it takes at least 7 years to realize a return on investment. The initial investment is large and the payback period is long. At the same time, there is a high risk of planting failure due to incompatibility with the forest environment, which seriously restricts the industrialization of the industry.
[0006] Third, the thickness and density of the green and yellow layers of natural bamboo cannot be artificially controlled, making it impossible to accurately match the optimal density requirements of wind instruments of different pitches and modes. This results in poor consistency in timbre and pitch among products in the same batch, making it difficult to meet the standardized requirements of professional performance.
[0007] Fourth, the industry has tried using 3D printing materials, synthetic resins, wood, metals and other materials to make wind instruments. However, none of these materials can replicate the dual-density gradient structure and natural fiber resonance characteristics of natural bamboo. The finished product's tone is significantly different from that of instruments made of high-quality natural bamboo, and it cannot gain widespread recognition in the professional performance market.
[0008] Fifth, due to the uneven density of the green and yellow layers of natural bamboo, certain internal stresses are generated. Musical instruments made of natural bamboo are prone to cracking in the low-humidity winter weather in northern regions. Summary of the Invention
[0009] To address the problems of stringent material selection, high bamboo cultivation costs, and uncontrollable properties of natural bamboo in existing technologies, this invention provides a method for manufacturing bamboo wind instruments, comprising the following steps: (1) Select bamboo and cut it into strips to obtain bamboo strip blanks; (2) The bamboo strip blanks are steamed and straightened to obtain rough blanks; (3) The rough billet is dried and aged to obtain the billet to be finished; (4) A connecting structure is processed on the splicing surface of the blank to be refined, and the ratio of the retained thickness of the bamboo green layer and the bamboo yellow layer is calculated and adjusted according to the design density of the target bamboo wind instrument. After completion, refined bamboo strips are obtained. (5) The finely processed bamboo strips are bonded together by a connecting structure, and a tube blank is obtained after curing. (6) The tube blank is modified in terms of inner and outer diameter, the sound hole is opened and the surface is treated to obtain the finished bamboo wind instrument.
[0010] Preferably, in step (1), natural old bamboo with an age of 5 years or more is selected, cut and then sliced along the direction of bamboo fibers, and bamboo strips with a width of 9-17mm are made from bamboo strips from the same section of bamboo. And / or, the natural old bamboo is selected from one of the following: Nan bamboo, Gui bamboo, bitter bamboo, and purple bamboo with a diameter of 3.7cm or more.
[0011] Preferably, in step (2), the bamboo strip blank is steamed at 130-150℃ and 0.2-0.4MPa for 30-90 minutes, and after straightening, a rough blank with a width of 8-16mm and a thickness of 5-11mm is obtained.
[0012] Preferably, in step (3), the rough billet is dried at 43-47°C for a total of 28-32 days, with the humidity controlled at 78-82% for the first 10 days, 58-62% for the middle 10 days, and 38-42% for the remaining time. And / or, the aging method is: aging for 1-2 years at a temperature of 28-32℃ and a humidity of 38-42% to obtain the blank to be refined.
[0013] Preferably, in step (4), under the conditions of a temperature of 23-27℃ and a humidity of 38-42%, a tenon or finger joint structure is processed on the splicing surface of the blank to be refined, and the thickness ratio of the bamboo green layer and the bamboo yellow layer is calculated and adjusted according to the design density of the target bamboo wind instrument, and refined bamboo strips are obtained after completion. And / or, the width of a single tooth in the mortise and tenon structure is 2-3 mm and the depth is 2-3 mm; And / or, the width of a single tooth in the finger joint structure is 1.5-2.5 mm and the depth is 1.2-1.8 mm; And / or, the thickness ratio of the bamboo green layer to the bamboo yellow layer is calculated using the weighted density formula: ρ = (ρ1 × h1 + ρ2 × h2) / (h1 + h2), where ρ is the target overall density of the tube, ρ1 is the measured density of the bamboo green layer, h1 is the retained thickness of the bamboo green layer, ρ2 is the measured density of the bamboo yellow layer, and h2 is the retained thickness of the bamboo yellow layer; through ratio control, the overall density of the tube is 0.70-0.95 g / cm³. 3 To better understand the characteristics of natural bamboo, this invention specifically took a cross-section of a section of *Phyllostachys edulis* (e.g., *Phyllostachys edulis*). Figure 1 As shown in the picture, this bamboo has a diameter of approximately 33mm. It is very clear from the image that the outer green layer has fine and dense fibers, while the inner yellow layer has coarse and sparse fibers. The green layer accounts for about one-third of the bamboo, and the yellow layer accounts for about two-thirds, varying depending on the bamboo species.
[0014] Preferably, the A-key xiao (vertical bamboo flute) with a fundamental tone pitch of E and the 1.6-foot shakuhachi (ancient Chinese bamboo flute) have a target overall density of 0.77-0.83 g / cm³. 3 The G-key xiao (vertical bamboo flute) with a fundamental tone pitch of D and the 1.8-foot shakuhachi (ancient Chinese bamboo flute), with a target overall density of 0.83-0.89 g / cm³. 3 The overall density of the bass wind instrument body is 0.89-0.95 g / cm³. 3 The overall density of the tube body of a high-pitched wind instrument is 0.70-0.77 g / cm³. 3 .
[0015] Preferably, in step (5), a low-viscosity two-component epoxy adhesive is used to apply adhesive to the connecting structure through an automatic dispensing process, and multiple finely processed bamboo strips are aligned and bonded together. The adhesive is cured for 24-26 hours at a temperature of 23-27℃ and a humidity of 38-42%, and a tube blank is obtained after completion. And / or, when the finely processed bamboo strips are bonded, the green bamboo layer faces the outside of the tube body and the yellow bamboo layer faces the inside of the tube body. The bonding is carried out by 6 or 8 finely processed bamboo strips enclosing a circular tubular structure. And / or, the low viscosity two-component epoxy adhesive is Aigo 7110 two-component epoxy adhesive; And / or, the adhesive layer thickness after bonding is 0.02-0.05mm.
[0016] Preferably, in step (6), the machining accuracy of the inner and outer diameter modification is within 0.02 mm; And / or, the surface treatment includes surface polishing and surface painting.
[0017] Based on the same technical concept, the present invention provides a bamboo wind instrument obtained by the above-described manufacturing method.
[0018] The beneficial effects of this invention are as follows: 1. This invention breaks through the strict limitations of traditional processes on the diameter, wall thickness, and length of bamboo by reassembling and splicing bamboo slabs. It can select large-diameter bamboo with a diameter of 3.7cm or more, greatly expanding the range of suitable bamboo materials and solving the technical problem of the scarcity of natural suitable bamboo materials. It can realize the standardized and large-scale production of bamboo wind instruments.
[0019] 2. This invention can fully utilize large-diameter bamboo by splitting it into sections, significantly improving the material utilization rate of the same section of bamboo compared to traditional processes. At the same time, it eliminates the need to rely on small-diameter, scarce, and suitable bamboo, greatly reducing the cost of bamboo planting and selection, shortening the industry's payback period, and reducing the planting and operation risks in the industry.
[0020] 3. This invention uses a weighted density formula to precisely calculate and control the retention thickness ratio of the bamboo green layer and the bamboo yellow layer, thus accurately controlling the overall density of the tube to 0.70-0.95 g / cm³. 3 Within this range, the optimal target density can be matched for wind instruments of different modes and pitches, fundamentally solving the problem that the density of natural bamboo is uncontrollable and cannot be accurately adapted to acoustic needs.
[0021] 4. This invention fully preserves the dual-density gradient structure and fiber resonance characteristics of natural bamboo, and the finished product can replicate the unique timbre and texture of high-quality natural bamboo. At the same time, through standardized processing technology and precise density control, the pitch deviation of products in the same batch can be controlled within 5 cents, with excellent consistency in timbre and pitch, fully meeting the professional performance standard.
[0022] 5. Natural bamboo exhibits internal stress due to the density difference between its green and yellow layers, making it prone to cracking in the low-humidity environment of northern regions. Traditional methods of making wind instruments struggle to avoid this problem. This invention fully eliminates the internal stress of bamboo through slicing, gradient drying, and aging processes. Combined with a splicing and connecting structure, it further offsets residual internal stress, significantly improving the structural stability of the tube. The resulting wind instruments can be used normally in the low-humidity environment of northern regions, with a greatly reduced risk of cracking. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a real photo of the cross-section of a Chinese bamboo.
[0025] Figure 2 This is a schematic diagram of a bamboo wind instrument with a mortise and tenon joint structure.
[0026] Figure 3 This is a schematic diagram of a bamboo wind instrument with a finger joint structure.
[0027] The attached figures are labeled as follows: 1- Mortise and tenon structure; 2- Finger joint structure. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0029] Example 1 This embodiment provides a method for manufacturing a G-key xiao (1.8-foot shakuhachi), with a target body pitch of D and an optimal overall density of 0.83-0.89 g / cm³. 3 The specific steps are as follows: (1) Material selection: Select 5-year-old moso bamboo growing in fertile soil with a high slope, with a bamboo diameter of 15cm, straight bamboo body, long bamboo nodes, uniform wall thickness, and no defects such as insect infestation, cracking, or mold. Cut the bamboo into fixed-length bamboo sections, and within 48 hours after cutting, slice along the fiber direction to obtain bamboo strip blanks with a width of 15mm. All bamboo strip blanks are taken from the same section of bamboo to ensure color difference and consistent performance.
[0030] (2) Pretreatment: The bamboo strip blank is placed in medium-pressure high-temperature steam at 140℃ and 0.3MPa for 60 minutes. After steaming, it is immediately sent to a straightening machine to straighten the entire length before cooling, so as to eliminate the natural bending and internal stress of the bamboo. Before the straightened bamboo strip is completely dried, it is processed into a rough blank with a width of 14mm and a thickness of 11mm by milling.
[0031] (3) Drying and aging: The rough blanks are neatly bundled and placed flat on a horizontal rack. They are then sent to a constant temperature and humidity drying room for gradient drying. The drying temperature is kept constant at 45℃ and the total drying time is 30 days. The humidity is controlled at 80% for the first 10 days, 60% for the middle 10 days, and 40% for the last 10 days. The bamboo is dried slowly to avoid cracking and deformation. After drying, the rough blanks are placed in an environment of 30℃ and 40% humidity for 12 months to fully release internal stress, stabilize the material size and performance, and obtain blanks for fine processing.
[0032] (4) Precision forming and processing: The blank to be precision processed is sent into a constant temperature and humidity precision processing workshop at 25℃ and 40% humidity. A four-sided high-precision high-speed precision milling machine is used, and non-standard tenon and mortise tools are installed on the four sides. The tenon and mortise structure 1 is processed on the four splicing surfaces of the bamboo strip in one go. The width of the single tooth tenon and mortise is 2.5mm and the depth is 2.5mm. The processing accuracy is controlled within 0.02mm. Simultaneous density ratio control: Samples from the same batch of raw materials were taken, and the bamboo green layer and bamboo yellow layer were separated to prepare standard samples of the same volume. After weighing, the actual density of the bamboo green layer of this batch of bamboo was measured to be 1.1 g / cm³. 3 The density of the bamboo yellow layer is 0.6 g / cm³. 3 Based on the target overall density of 0.86 g / cm³ 3 The thickness of the green bamboo layer was determined to be 4.16 mm and the thickness of the yellow bamboo layer to be 3.84 mm by weighted density formula calculation. The thickness was then adjusted by precision milling.
[0033] (5) Splicing and bonding: Take 8 processed bamboo strips, with the green bamboo layer facing outwards and the yellow bamboo layer facing inwards. The bamboo strips are aligned and spliced using mortise and tenon structure 1. Use an automatic dispensing machine to evenly apply Aigo 7110 two-component epoxy glue. The amount of glue applied is controlled so that the thickness of the glue layer after curing is 0.03mm and there are no visible glue seams. After applying the glue, use a non-standard round clamp to surround and fix the bamboo strips into a tubular structure. Place it in an environment of 25℃ and 40% humidity to cure for 24 hours. After the glue is completely dry, demold to obtain the tube blank.
[0034] (6) Precision machining: The inner and outer diameters of the tube blank are precisely milled and shaped, and the machining accuracy is controlled within 0.02mm to achieve the designed inner and outer diameter specifications; then the tone holes are precisely opened according to the design of the G-key flute, and then the surface is polished and painted to obtain the finished G-key flute.
[0035] The G-key xiao produced in this embodiment is suitable for both southern and northern regions. It has uniform tube density, high dimensional accuracy, full and mellow tone, and pitch deviation of less than 5 cents, fully meeting professional performance standards. The tone and pitch consistency of products in the same batch are excellent, and the material utilization rate is 85% higher than that of traditional processes.
[0036] Example 2 This embodiment provides a method for manufacturing an A-key xiao (1.6-foot shakuhachi), with a target body pitch of E and an optimal overall density of 0.77-0.83 g / cm³. 3 The specific steps are as follows: (1) Material selection: Select 5-year-old bamboo growing in fertile soil with a high slope, with a diameter of 12cm, straight bamboo body, long bamboo nodes, uniform wall thickness, and no defects such as insect infestation, cracking, or mold. Cut the bamboo into fixed-length bamboo sections, and within 72 hours after cutting, slice along the fiber direction to obtain bamboo strip blanks with a width of 12mm. All bamboo strip blanks are taken from the same section of bamboo.
[0037] (2) Pretreatment: The bamboo strip blank is placed in medium-pressure high-temperature steam at 135℃ and 0.25MPa for 45 minutes. After steaming, it is immediately sent to a straightening machine to straighten the entire length before cooling. Before the straightening is completely dried, the blank is machined and milled to obtain a blank with a width of 11mm and a thickness of 9mm.
[0038] (3) Drying and aging: The rough billet is neatly bundled, placed flat on a horizontal rack, and sent into a constant temperature and humidity drying room for gradient drying. The drying temperature is kept constant at 45℃, and the total drying time is 30 days. The ambient humidity is controlled at 80% for the first 10 days, 60% for the middle 10 days, and 40% for the last 10 days. After drying, the rough billet is placed in an environment of 30℃ and 40% humidity for 14 months to obtain the billet to be refined.
[0039] (4) Precision forming and processing: In a constant temperature and humidity precision processing workshop at 25℃ and 40% humidity, a four-sided high-precision high-speed precision milling machine is used, and non-standard finger joint tools are installed to process the finger joint structure 2 on the bamboo strip splicing surface in one go. The width of a single tooth finger joint is 2mm and the depth is 1.5mm. The processing accuracy is controlled within 0.02mm. Density ratio control was carried out simultaneously: the measured density of the bamboo green layer in this batch was 1.05 g / cm³. 3 The density of the bamboo yellow layer is 0.58 g / cm³. 3 Based on the target overall density of 0.80 g / cm³ 3 The thickness of the green bamboo layer was calculated to be 2.64 mm and the thickness of the yellow bamboo layer was determined to be 3.36 mm. The thickness was adjusted by precision milling.
[0040] (5) Splicing and bonding: Take 6 processed bamboo strips, with the green bamboo layer facing outwards and the yellow bamboo layer facing inwards. Splice them together in two positions using a finger joint structure. Apply Aigao 7110 two-component epoxy glue evenly. After the glue layer is cured, control the thickness to 0.04mm. After applying the glue, use non-standard clamps to enclose and fix them into a tube shape. Place them in an environment of 25℃ and 40% humidity to cure for 30 hours to obtain a tube blank.
[0041] (6) Fine processing: The inner and outer diameters of the tube blank are precisely modified, the sound holes are opened, and the surface is polished and painted to obtain the finished A-key flute.
[0042] The A-key xiao produced in this embodiment has a clear and bright tone, accurate pitch, and is suitable for both southern and northern regions. It does not crack or deform after long-term use, and the performance of products from the same batch is excellent.
[0043] Example 3 This embodiment provides a method for manufacturing a bass bamboo flute, with the target tube being a bass wind instrument, and the optimal overall density being 0.89-0.95 g / cm³. 3 The specific steps are as follows: (1) Material selection: Select 6-year-old moso bamboo growing in fertile soil with a high slope, with a bamboo diameter of 17cm, straight bamboo body, long bamboo nodes, thick walls, and no defects; cut the bamboo into fixed-length bamboo sections, and within 24 hours after cutting, slice along the fiber direction to obtain bamboo strip blanks with a width of 17mm. All bamboo strip blanks are taken from the same section of bamboo.
[0044] (2) Pretreatment: The bamboo strip blanks are placed in medium-pressure high-temperature steam at 150℃ and 0.4MPa for 90 minutes. After steaming, they are straightened immediately before cooling. After straightening, the blanks are machined before they are completely dried, and a blank with a width of 16mm and a thickness of 11mm is obtained by milling.
[0045] (3) Drying and aging: The rough billet is subjected to gradient drying at a temperature of 45℃ for a total duration of 32 days, with humidity gradients of 80%, 60%, and 40%. After drying, it is placed in an environment of 30℃ and 40% humidity for 18 months to obtain the billet to be refined.
[0046] (4) Precision forming and processing: In a constant temperature and humidity workshop of 25℃ and 40% humidity, the tenon and mortise structure 1 is processed by a four-sided high-precision high-speed milling machine. The width of a single tooth tenon and mortise is 3mm and the depth is 3mm. The processing accuracy is controlled within 0.02mm. Synchronous density control: The measured density of the bamboo green layer in this batch was 1.2 g / cm³. 3 The density of the bamboo yellow layer is 0.62 g / cm³. 3 Based on the target overall density of 0.92 g / cm³ 3 The thickness of the bamboo green layer and the bamboo yellow layer was calculated and determined to be 3.5 mm, and the thickness was adjusted by fine milling.
[0047] (5) Splicing and bonding: Take 8 processed bamboo strips with the green bamboo layer facing outward and the yellow bamboo layer facing inward. They are spliced together by mortise and tenon structure 1. They are coated with Aigao 7110 two-component epoxy glue with a glue layer thickness of 0.02mm. After the clamps are closed and fixed, they are placed in an environment of 25℃ and 40% humidity for 48 hours to cure and obtain the tube blank.
[0048] (6) Fine processing: The inner and outer diameters of the tube blank are finely repaired, the bass flute sound hole is opened, and the surface is treated to obtain the finished bass bamboo flute.
[0049] The bass bamboo flute produced in this embodiment has a stable tube structure, uniform density, and a full and rich bass resonance. It is suitable for both southern and northern regions and will not deform or crack after long-term use, meeting professional performance standards.
[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.
Claims
1. A method for manufacturing a bamboo wind instrument, characterized in that, The manufacturing method includes the following steps: (1) Select bamboo and cut it into strips to obtain bamboo strip blanks; (2) The bamboo strip blanks are steamed and straightened to obtain rough blanks; (3) The rough billet is dried and aged to obtain the billet to be finished; (4) A connecting structure is processed on the splicing surface of the blank to be refined, and the ratio of the retained thickness of the bamboo green layer and the bamboo yellow layer is calculated and adjusted according to the design density of the target bamboo wind instrument. After completion, refined bamboo strips are obtained. (5) The finely processed bamboo strips are bonded together by a connecting structure, and a tube blank is obtained after curing. (6) The tube blank is modified in terms of inner and outer diameter, the sound hole is opened and the surface is treated to obtain the finished bamboo wind instrument.
2. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (1), select natural old bamboo with an age of more than 5 years, cut it and slice it along the direction of bamboo fiber, and use bamboo strips from the same section of bamboo to make bamboo strip blanks with a width of 9-17mm. And / or, the natural old bamboo is selected from one of the following: Nan bamboo, Gui bamboo, bitter bamboo, and purple bamboo with a diameter of 3.7cm or more.
3. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (2), the bamboo strip blank is steamed at 130-150℃ and 0.2-0.4MPa for 30-90 minutes, and after straightening, a rough blank with a width of 8-16mm and a thickness of 5-11mm is obtained.
4. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (3), the rough billet is dried at 43-47℃ for a total of 28-32 days, with the humidity controlled at 78-82% for the first 10 days, 58-62% for the middle 10 days, and 38-42% for the remaining time. And / or, the aging method is: aging for 1-2 years at a temperature of 28-32℃ and a humidity of 38-42% to obtain the blank to be refined.
5. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (4), under the conditions of temperature of 23-27℃ and humidity of 38-42%, mortise and tenon structure or finger joint structure is processed on the splicing surface of the blank to be refined. According to the design density of the target bamboo wind instrument, the ratio of the retained thickness of the bamboo green layer and the bamboo yellow layer is calculated and adjusted. After completion, refined bamboo strips are obtained. And / or, the width of a single tooth in the mortise and tenon structure is 2-3 mm and the depth is 2-3 mm; And / or, the width of a single tooth in the finger joint structure is 1.5-2.5 mm and the depth is 1.2-1.8 mm; And / or, the thickness ratio of the bamboo green layer to the bamboo yellow layer is calculated using the weighted density formula: ρ = (ρ1 × h1 + ρ2 × h2) / (h1 + h2), where ρ is the target overall density of the tube, ρ1 is the measured density of the bamboo green layer, h1 is the retained thickness of the bamboo green layer, ρ2 is the measured density of the bamboo yellow layer, and h2 is the retained thickness of the bamboo yellow layer; through ratio control, the overall density of the tube is 0.70-0.95 g / cm³. 3 .
6. The method for manufacturing a bamboo wind instrument according to claim 5, characterized in that, The A-key xiao (vertical bamboo flute) with a fundamental tone pitch of E and the 1.6-foot shakuhachi (ancient Chinese bamboo flute) have a target overall density of 0.77-0.83 g / cm³. 3 The G-key xiao (vertical bamboo flute) with a fundamental tone pitch of D and the 1.8-foot shakuhachi (ancient Chinese bamboo flute), with a target overall density of 0.83-0.89 g / cm³. 3 The overall density of the bass wind instrument body is 0.89-0.95 g / cm³. 3 The overall density of the tube body of a high-pitched wind instrument is 0.70-0.77 g / cm³. 3 .
7. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (5), a low-viscosity two-component epoxy adhesive is used to apply adhesive to the connecting structure through an automatic dispensing process. Multiple finely processed bamboo strips are aligned and bonded together. The adhesive is cured for 24-26 hours at a temperature of 23-27℃ and a humidity of 38-42%. After completion, a tube blank is obtained. And / or, when the finely processed bamboo strips are bonded, the green bamboo layer faces the outside of the tube body and the yellow bamboo layer faces the inside of the tube body. The bonding is carried out by 6 or 8 finely processed bamboo strips enclosing a circular tubular structure. And / or, the low viscosity two-component epoxy adhesive is Aigo 7110 two-component epoxy adhesive; And / or, the adhesive layer thickness after bonding is 0.02-0.05mm.
8. The method for manufacturing a bamboo wind instrument according to claim 1, characterized in that, In step (6), the machining accuracy of the inner and outer diameter modification is within 0.02 mm; And / or, the surface treatment includes surface polishing and surface painting.
9. A bamboo wind instrument obtained by the manufacturing method according to any one of claims 1-8.