CN112863459A

CN112863459A - Method for manufacturing Huqin bow with standardized adjustable center of gravity point

Info

Publication number: CN112863459A
Application number: CN202011611820.6A
Authority: CN
Inventors: 王思拓; 白明庆; 马志慧; 杜晋国
Original assignee: Guanglian Aviation Industry Co ltd
Current assignee: Guanglian Aviation Industry Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-28
Anticipated expiration: 2040-12-30
Also published as: CN112863459B

Abstract

A method for manufacturing a Huqin bow with a standardized adjustable gravity center point belongs to the technical field of national musical instruments. The method comprises the following steps: the method comprises the following steps: molding a bow rod front end piece; step two: drilling holes and performing surface treatment on a bow rod nose piece: step three: forming and surface treating a rear end piece of the bow rod: step four: assembling the bow rod: tightly inserting the metal pin shaft of the rear end piece of the bow rod into the rectangular groove on the rear end face of the front end piece of the bow rod to form the bow rod; step five: b, bow fish forming and surface treatment: sixthly, assembling the bow fish and the bow rod rear end piece; step seven: and (5) assembling the fiddle bow. The invention combines the sound producing principle of the urheen with the novel composite material, combines the acoustic process of the traditional manual bow making with the carbon fiber, thereby improving the properties of the bow, such as strength, tensile strength, elasticity, stability and the like, on the premise of not changing the tone quality and the external shape of the traditional material bow; meanwhile, the high-volume production, the high environmental protection, the maintenance-free, the low cost and the standardized volume production are achieved, and the carbon fiber becomes a novel material for replacing the traditional bamboo bow.

Description

Method for manufacturing Huqin bow with standardized adjustable center of gravity point

Technical Field

The invention belongs to the technical field of national musical instruments, and particularly relates to a method for manufacturing a Huqin bow with a standardized adjustable center of gravity.

Background

The bow is an important component of the urheen, and consists of a bow rod, a bow hair and a bow fish, wherein the bow hair is fixed at two ends of the bow rod, and the tension degree of the bow hair is changed by adjusting the position of the bow fish. Traditional bow-shaped rod is baked the hand and is broken the shaping off with the fingers and thumb by the whole bamboo of an approximate 84CM heat, and bamboo material compares carbon fiber material: poor plasticity, poor adjustability and poor stability, and can not form a standard of quality and a standard of quantification for production. The basic conditions of the bow rod, such as straightness, elasticity, light weight and toughness (good bending strength), and the like, determine the playing effect of the urheen. The bow has moderate curvature, proper balance point, good elasticity, and coincidence of position center point and gravity center point, so that the emotion in the musical composition can be expressed perfectly by a player, but the bow made of traditional bamboo materials is difficult to achieve the performance stably. And receive influences such as temperature and humidity in the use, rigidity, elasticity, the bending that toasts the in-process timing and stereotype also can warp the outward appearance gradually, greatly influence the bow degree of controlling and comfort level. Therefore, the existing bamboo bows manufactured by hands cannot well restore musical notes of works, clearly show the works and stably express the original ideas of the works. The main problem that current bamboo material musical instrument bow exists has:

1. the high-quality raw materials are rare and the cost is high. The differences of the production area, variety, distance of bamboo joints, growth soil, year, compactness and the like of each batch of bamboos have great influence on the lateral bending, rigidity, elasticity, weight and the like of the bow rod, and the cost of raw materials is gradually increased.

2. The preparation process before manufacturing is long and the productivity is low. The bow rod is formed by manually pressing bamboo baking with the length of 80-85CM, the diameter of 0.7-0.85CM and the raw material of 3-5 years. The bamboo is firstly forced to be watered by big fire, straightened by small fire, baked and bent by slow fire and other procedures to finish drying treatment, and then the bamboo is subjected to baking adjustment, cooling shaping and other processes to shape the curvature and the bending degree of the bow stick. The bows can swing left and right during playing, and the bamboo has low rigidity.

3. The manufacturing process has no quantitative index, and the high-quality product rate is low. The diameter and the thickness of the bamboo are not consistent, so that the gravity center and the rigidity of the bamboo are not uniform. The increase of the diameter of the arch bar leads to the increase of the mass, and the change of the diameter position and the compactness of the bamboo determines the hardness and elasticity of the position and directly influences the playing effect. Bamboo fiber material only can open round holes, which causes the arched hair bundle interface to be round and increases the sectional area. The position of the bow node has great influence on the elasticity, the toughness and the center of gravity of the bow rod.

4. The fiddle bow is not easy to clean, maintain and preserve. The bow is used for long-term playing, the bow hair is easy to stick foreign matters such as sweat, grease and the like, the bow hair cannot be directly cleaned because the traditional bamboo bow cannot contact liquid, and only the simple wiping and cleaning can be carried out by using wet tissues. Bamboo material weatherability is poor, and the preservation in-process requires higher to temperature and humidity, and bamboo material exists shortcomings such as absorb water, moisture absorption, go mildy, thereby the bow rod is easy to take place the fracture damage, can not keep crookedness until unable use for a long time.

5. Low strength and short service life. The bow hair in the traditional bamboo material bow pole and the junction of bow body have stress concentration, and intensity is weak, if draw high strength bent son need make very big strength, carelessly a little, the bow pole is cracked from the well easily.

Disclosure of Invention

The invention aims to overcome the defects of the existing Huqin bow in material, structure and weather resistance, and provides a Huqin bow manufacturing method which is flexible in bow carrying, sensitive in response, full in pronunciation and easy in volume and strength control and has a standardized adjustable center of gravity point.

The idea of the invention is as follows: combining the sounding principle of the urheen with the novel composite material; the acoustic process of the traditional manual bow making is combined with the carbon fiber, so that the properties of the traditional bow, such as strength, tensile strength, elasticity, stability and the like, are improved on the premise of not changing the tone quality and the external shape of the traditional bow; meanwhile, the high-volume production, the high environmental protection, the maintenance-free, the low cost and the standardized volume production are achieved, and the carbon fiber becomes a novel material for replacing the traditional bamboo bow.

Scientifically increasing the radian of the bow rod is more beneficial to the elasticity of the bow and is beneficial to a player to transmit the force to the strings; the carbon fiber piano rod improves the strength and weather resistance, the bow tail is not easy to break from the bow rod, and the bow body does not shake during playing; the design of the rectangular opening at the upper end of the bow rod improves the phenomenon that the traditional bow is limited by a binding hoop and cannot be fully pulled.

1. The carbon fiber has wide raw material.

2. And (3) defining quantitative and materialization parameter indexes: establishing a digital model by performing 3D scanning on a mass top-level fiddle bow; and (4) performing analysis such as stress mechanics finite element analysis, establishing a standard database of the fiddle bow product, and forming a full-product series product line.

3. Standardized mass production: the large-scale bow member carbon fiber shaping frock of preparation cuts out hundreds of bow members after a carbon fiber bow member big board solidifies, and CNC (digit control machine tool) processing keeps the precision. Through the carbon fiber layer design, the bow rod has large left and right stress and high rigidity during playing, and the phenomenon of left and right swinging of the bow head can not occur.

4. Stable performance and easy maintenance: high hardness, high modulus, light weight, acid and alkali resistance, stable performance at high temperature and high humidity, and the whole bow can be directly washed and soaked for cleaning. The bow hair is convenient to replace, and the bow rod can be used for a long time without deformation.

5. The human engineering design: the appearance design of the bow fish makes holding and playing more convenient and more comfortable, and increases the effective use distance of the bow hair on the premise of not increasing the length and weight of the bow rod.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method of making a fiddle bow having a standardized adjustable center of gravity point, said method comprising the steps of:

the method comprises the following steps: molding a bow rod front end piece; the external shape of the bow rod front end piece is approximately a number '7', the front end of the bow rod front end piece is bent and tilted, the rear end of the bow rod front end piece is a straight shape, and the section of the rear end of the bow rod front end piece is a rectangle; the bow rod nose piece is formed by the following steps: laying on a bow rod nose piece forming tool: the carbon fiber prepreg is 88mm wide and 750mm long, the spreading height of the carbon fiber prepreg is low in the front and high in the back, the change range of the height from front to back is 2.5-4mm, the spreading thickness of each layer of carbon fiber prepreg is 0.1mm, and 25-40 layers are always spread; installing a high-temperature-resistant film bag on a bow rod front end piece forming tool, pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the laid carbon fiber prepreg, putting the bow rod front end piece forming tool into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, and curing and forming the laid carbon fiber prepreg for 60-300 min; taking out the bow rod front end piece forming tool after the temperature in the vacuum hot pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag on the bow rod front end piece forming tool, taking down the carbon fiber prepreg plate which is formed by curing, and cutting the carbon fiber prepreg plate into bow rod front end pieces with the width of 8mm, the length of 650mm and the height of the same range as the change range of the layer height of the carbon fiber prepreg;

step two: bow rod nose piece opening and recess and surface treatment: the bending end of the bow rod front end piece is defined as the front upper end of the bow rod front end piece, a rectangular opening is formed in the position, 2-6mm away from the top, of the front upper end of the bow rod front end piece, the length of the rectangular opening is 5-7mm, the width of the rectangular opening is 2-4mm, a bow hair bundle penetrates through the rectangular opening, and a rectangular groove is formed in the rear end face of the bow rod front end piece for the purpose of being connected with the bow rod rear end piece; performing finish treatment on the surface of the front end piece of the bow rod to enable the finish to reach more than Ra0.05;

step three: forming and surface treating a rear end piece of the bow rod: a curved metal hollow pipe is prefabricated, a transition section is arranged at the front end of the curved metal hollow pipe, the cross section of the transition section is consistent with that of the rear end of the front end piece of the bow rod and is also rectangular, the rest part of the curved metal hollow pipe except the transition section is a circular pipe, and a metal pin shaft matched with the rectangular groove is arranged at the front end of the transition section of the curved metal hollow pipe; winding carbon fiber fabric prepreg with fabric fiber tows of more than 3K on the outer surface of the metal curved hollow tube, additionally installing a high-temperature resistant film bag, pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the carbon fiber fabric prepreg wound on the outer surface of the metal curved hollow tube, putting the metal curved hollow tube into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, curing and molding the wound carbon fiber fabric prepreg for 60-300min, taking out a rear end piece forming part of the bow rod after the temperature in the vacuum hot-pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag, performing finish treatment on the surface of the rear end piece forming part of the bow rod to enable the finish to reach more than Ra0.05, and manufacturing the rear end piece of the bow rod;

step four: assembling the bow rod: tightly inserting a metal pin shaft of the rear end piece of the bow rod into a rectangular groove on the rear end face of the front end piece of the bow rod to form the bow rod;

step five: b, bow fish forming and surface treatment: the external shape of the Bow fish is similar to a hook, and the forming process of the Bow fish is as follows: sequentially laying carbon fiber prepreg on a Bow fish forming tool, wherein the laying thickness of each layer of carbon fiber prepreg is 0.1-0.2mm, laying 40-80 layers in total, adding a vacuum film bag on the Bow fish forming tool, pumping negative pressure of 0.5-1.5MPa by using a vacuum nozzle, compacting the laid carbon fiber fabric prepreg, putting the Bow fish forming tool into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, curing and forming the laid carbon fiber prepreg for 60-300min, taking out the Bow fish forming tool after the temperature in the vacuum hot-pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag, lifting the Bow fish formed part, and performing finish treatment on the surface of the Bow fish formed part to ensure that the finish degree reaches more than Ra0.05;

sixthly, assembling the bow fish and the bow rod rear end piece; the side wall of the bow rod rear end piece is provided with a rectangular hole along the length direction, a nut and a live bolt are both arranged in the inner cavity of the bow rod rear end piece and are in threaded connection, the end head of the live bolt is abutted against the rear end face of the bow rod rear end piece, the nut is arranged at the rectangular hole and is fixedly connected with the lower end face of a bow fish, the live bolt is rotated, and the nut slides in the rectangular hole in a reciprocating manner, so that the bow fish is driven to move back and forth, and the purpose of adjusting the tightness of bow hair on the bow rod is achieved;

step seven: assembling the fiddle bow: firstly, sleeving a section of heat-shrinkable tube I on a bow rod of a bow, enabling one end of bow hair to penetrate through a rectangular opening at the upper end of a front end part of the bow rod and then to be folded downwards by 10-15mm, winding the downward folded part of the bow hair by using a plurality of loops of wires to enable the bow hair to be wound and restrained with the bow rod, moving the heat-shrinkable tube to sleeve the downward folded part of the bow hair, and then heating and shrinking the heat-shrinkable tube I to restrain the bow hair and the bow rod of the part; then, the bow fish is moved to the foremost end of the rectangular hole, the other end of the bow hair is wound on the bow fish hook to be folded, the bent part of the bow hair is wound by a plurality of circles of wires to be wound with the bow rod, the bent part of the bow hair is sleeved by the heat-shrinkable tube, the heat-shrinkable tube II is heated to shrink the bent part of the bow hair, and finally the movable bolt is rotated to enable the bow hair to reach a specified tension value.

Compared with the prior art, the invention has the beneficial effects that:

because the carbon fiber material has: high strength, high modulus, light weight, acid and alkali resistance, stable performance in high-humidity and high-temperature environment, convenient shaping in the laying process and the like. Through the comprehensive mechanical stress analysis to the bamboo bow science of tradition, excavate the excellent characteristic that carbon fiber material had in its mechanical stress field, under the advantage prerequisite that all remain traditional bamboo bow possesses advantages such as resilience, utilize carbon fiber technology to further improve the performance of bow again, make the huqin give play to whole range, promote the user and use the impression. The advantages of the invention are shown in the following aspects:

1. the bow rod made of carbon fiber can be straight without side bending, has moderate radian and adjustable center of gravity, and has high hardness, strong toughness, sufficient elasticity and no softness. The traditional bamboo bow is formed by breaking a whole 84CM bamboo hot baking hand, and has poor plasticity and low stability.

2. The rectangular opening is formed in the front end piece of the bow rod, so that the bow hair shape is presented in a flat shape, the advantages that the bow hair is larger in string pasting surface, strings are not wiped, the bow is more stable and the like in the playing process are achieved, and the defect that a circular hole can only be formed in a traditional bamboo material bow is overcome.

3. The radian and toughness of the traditional bamboo material fiddle bow have no quantitative standard, and the radian of the fiddle bow determines the center of gravity, hardness, toughness and elasticity of the fiddle bow. When the strength music is pulled, in order to achieve the effect that the music can quickly burst to follow the rhythm, a player needs to have great strength in the bow carrying process, and the radian of the bow directly influences the continuity of playing actions and playing habits. The carbon fiber material can reach any radian and thickness required by design, thereby realizing the perfect combination of toughness and hardness. The traditional bamboo material bow is formed by breaking a whole bamboo hot baking hand of 84CM, and the adjustability of the material is poor.

4. The carbon fiber bow stick for making the fiddle bow has stable performance, is easy to use for a long time and is convenient to store. Traditional bamboo material musical instrument bow has harsh requirement to the preservation environment, and temperature, humidity, sunshine etc. are very big to the influence of musical instrument bow performance, because the crookedness of traditional bamboo material musical instrument all toasts the manual curved formation of breaking off with the fingers and thumb, preserves and will seriously warp about improper one year. The carbon fiber material is used for removing the fiddle bows which are produced in a standardized, serialized and batched mode, the long-term stability of the performance can be guaranteed, a user only needs to replace bowhair, and the use cost of the user is saved.

5. The croaker also adopts carbon fiber materials, so that the consumption of expensive wood such as ebony in the prior art is reduced.

6. The front end of the metal curved hollow tube is provided with a gradual change section, so that the weight of the head of the fiddle bow is changed, and the center of gravity of the fiddle bow can be adjusted.

Drawings

FIG. 1 is a front view of a bow rod nose piece molding tool;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 is a front view of the bow tip;

fig. 5 is a front view of a curved hollow metal tube.

The names and reference numbers of the components referred to in the above figures are as follows:

bow pole front-end part shaping frock 1, curved hollow tube 2 of metal, bow pole front-end part 3.

Detailed Description

The first embodiment is as follows: as shown in fig. 1 to 5, the present embodiment discloses a method for manufacturing a fiddle bow having a standardized adjustable center of gravity, the method comprising the steps of:

the method comprises the following steps: forming the bow rod nose piece 3; the external shape of the bow rod front end piece 3 is similar to a numeral '7', the front end of the bow rod front end piece 3 is bent and tilted, the rear end of the bow rod front end piece 3 is straight, and the section of the rear end of the bow rod front end piece 3 is rectangular; the bow rod nose piece 3 is formed by the following steps: lay on bow pole front end piece shaping frock 1: the width of the carbon fiber prepreg is 88mm, the length of the carbon fiber prepreg is 750mm, the spreading height of the carbon fiber prepreg is front low and back high, the change range of the height from front to back is 2.5-4mm (the rebound resilience and the gravity center point of an arch bar can be adjusted through the height change), the laying thickness of each layer of the carbon fiber prepreg is 0.1mm, and 25-40 layers are always laid; the method comprises the following steps of adding a high-temperature-resistant film bag on a bow rod front end piece forming tool 1, pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the laid carbon fiber prepreg, putting the bow rod front end piece forming tool 1 into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, and curing and forming the laid carbon fiber prepreg for 60-300 min; taking out the bow rod front part forming tool 1 after the temperature in the vacuum hot pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag on the bow rod front part forming tool 1, taking down the carbon fiber prepreg plate which is formed by curing, and cutting the carbon fiber prepreg plate into bow rod front parts 3 which have the width of 8mm, the length of 650mm and the height of the same range as the change range of the layer height of the carbon fiber prepreg;

step two: bow rod nose piece 3 opening and groove and surface treatment: the bending end of the bow rod front end piece 3 is defined as the front upper end of the bow rod front end piece 3, a rectangular opening is formed in the position, 2-6mm away from the top, of the front upper end of the bow rod front end piece 3, the length of the rectangular opening is 5-7mm, the width of the rectangular opening is 2-4mm, a bow hair bundle penetrates through the rectangular opening, and a rectangular groove is formed in the rear end face of the bow rod front end piece 3 and is used for being connected with the bow rod rear end piece; and performing finish treatment on the surface of the bow rod nose piece 3 to enable the finish to reach more than Ra0.05.

The traditional bamboo bow rod front end piece can only be opened into circular shape at the opening part of the binding bow hair because of material characteristics, and the contact state of the bow hair bundle and the strings of a huqin is a cylinder when the bow hair bundle is played, so that the contact area is small, and the string scraping phenomenon is also caused.

The invention is characterized in that a rectangular opening is arranged at the position 2mm-6mm away from the top of the front upper end of the bow rod front end piece 3, the length of the rectangular opening is 5mm-7mm, the width of the rectangular opening is 2mm-4mm (the length of the rectangular opening is preferably 6mm, and the width of the rectangular opening is preferably 3mm), and a bow hair bundle penetrates through the rectangular opening, so that the defect is fundamentally solved, and the friction area between the bow hair and a bow string is increased.

Step three: forming and surface treating a rear end piece of the bow rod: a curved metal hollow pipe 2 is prefabricated, a transition section (the section of the transition section is sequentially increased from front to back) is arranged at the front end of the curved metal hollow pipe 2, the section shape of the transition section is consistent with that of the back end of a bow rod front end piece 3 and is also rectangular, the rest part of the curved metal hollow pipe 2 except the transition section is a circular pipe, and a metal pin shaft matched with a rectangular groove is arranged at the front end of the transition section of the curved metal hollow pipe 2; winding carbon fiber fabric prepreg (the thickness is 0.8-1.5mm) with fabric fiber tows of more than 3K on the outer surface of the metal curved hollow tube 2, additionally installing a high-temperature-resistant film bag, pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the carbon fiber fabric prepreg wound on the outer surface of the metal curved hollow tube 2, putting the metal curved hollow tube 2 into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, curing and molding the wound carbon fiber fabric prepreg for 60-300min, taking out a rear end piece of the bow rod after the temperature in the vacuum hot-pressing tank is reduced to 40-60 ℃, removing the high-temperature-resistant film bag, and performing finish treatment on the surface of the rear end piece of the bow rod to enable the surface of the rear end piece of the bow rod to reach more than Ra0.05 to prepare the;

step four: assembling the bow rod: tightly inserting a metal pin shaft of the rear end piece of the bow rod into a rectangular groove on the rear end face of the front end piece 3 of the bow rod to form the bow rod;

step five: b, bow fish forming and surface treatment: the external shape of the Bow fish is similar to a hook, and the forming process of the Bow fish is as follows: sequentially laying carbon fiber prepregs on a Bow fish forming tool (the conventional Bow fish is generally 8mm wide, 35mm long and 15mm high), laying the carbon fiber prepregs in each layer to be 0.1-0.2mm thick, laying 40-80 layers totally, additionally arranging a vacuum film bag on the Bow fish forming tool, pumping negative pressure of 0.5-1.5MPa by using a vacuum nozzle, compacting the laid carbon fiber fabric prepregs, putting the Bow fish forming tool into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, curing and forming the laid carbon fiber prepregs for 60-300min, taking out the Bow fish forming tool after the temperature in the vacuum hot-pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag, lifting the Bow fish forming tool, and performing finish treatment on the surface of the Bow fish forming tool to enable the finish to reach above Ra0.05;

step seven: assembling the fiddle bow: firstly, sleeving a section (5-25 mm in length) of heat-shrinkable tube I on a bow rod of a bow, enabling one end (with the size meeting the requirement) of bow hair to penetrate through a rectangular opening at the upper end of a bow rod front end part 3 and then downwards folding for 10-15mm, winding and locking the part, which is downwards folded, of the bow hair with the bow rod by using a plurality of loops of winding wires, moving the heat-shrinkable tube to sleeve the part, which is downwards folded, of the bow hair, and heating and shrinking the heat-shrinkable tube I to lock the part of the bow hair and the bow rod; then, the bow fish is moved to the foremost end (the loose end) of the rectangular hole, the other end of the bow hair is wound on the bow fish hook to be folded, the bent part of the bow hair is wound by a plurality of circles of wires to be wound with the bow rod, the bent part of the bow hair is sleeved by the heat-shrinkable tube, the heat-shrinkable tube II is heated and shrunk to be restricted to the bent part of the bow hair, and finally the movable bolt is rotated to enable the bow hair to reach the specified tension value.

The second embodiment is as follows: in the first step, the fabric fiber tows of the carbon fiber fabric prepregs at the lowest layer and the highest layer are laid by using more than 3K, the intermediate layer is laid by using the carbon fiber unidirectional prepregs, and the carbon fiber unidirectional prepregs of the intermediate layer are sequentially laid from the lower layer to the upper layer at the laying angle of 0 °, 90 °, 45 ° and-45 ° until the laying thickness reaches the required height (in order to increase the stability of the bow rod front end piece 3 in the aspects of straightness, toughness, resilience and the like).

The third concrete implementation mode: as shown in fig. 4, this embodiment is further described with respect to the first embodiment, and in the second step, the surface of the bow tip 3 is subjected to a finish treatment, specifically: spraying a layer of primer on the outer surface of the bow rod front end piece 3, drying for 2-4 hours and then polishing once until the finish degree reaches more than Ra0.1, spraying a layer of matte finish, drying for 2-4 hours and then polishing once until the finish degree reaches more than Ra0.05.

The fourth concrete implementation mode: as shown in FIG. 5, this embodiment is further illustrated by the first embodiment, in the third step, the length of the transition section of the curved hollow metal tube 2 is 10mm to 30mm, the length of the circular tube of the curved hollow metal tube 2 is 100mm to 250mm, the diameter of the outer circular surface is 6mm to 8mm, and the wall thickness is 1.5mm to 3 mm.

The fifth concrete implementation mode: in the third step, the surface of the molding piece of the rear end piece of the bow rod is subjected to finish treatment, specifically: and spraying a layer of primer on the outer surface of the rear end piece of the bow rod, polishing after drying for 2-4 hours until the finish degree reaches more than Ra0.1, spraying a layer of matte finish, and polishing after drying for 2-4 hours until the finish degree reaches more than Ra0.05.

The sixth specific implementation mode: in the fifth step, the fabric fiber tows of the carbon fiber fabric prepregs at the lowest layer and the highest layer are laid by more than 3K, the intermediate layer is laid by the carbon fiber unidirectional prepregs, and the carbon fiber unidirectional prepregs of the intermediate layer are sequentially laid from the lower layer to the upper layer according to the sequence of 0 °, 90 °, +45 °, and-45 °, until the laying thickness reaches the required height (in order to increase the stability of the croakers).

The seventh embodiment: in the fifth step, the surface of the molded bowed fish piece is subjected to finish treatment, specifically: spraying a layer of primer on the surface of the bow fish molded part, polishing after 2-4h drying until the finish degree reaches more than Ra0.1, spraying a layer of matte finish, and polishing after 2-4h drying until the finish degree reaches more than Ra0.05.

The specific implementation mode is eight: in the seventh step, the temperature for heating the first heat-shrinkable tube is 55-85 ℃ and the time is 5-15 s; and heating the second heat-shrinkable tube at 55-85 ℃ for 5-15 s.

The traditional manufacturing process of the huqin bow has a history of over 600 years, and the manufacturing craftsmen are technical workers needing long-term professional training, and all adopt a relatively original manual cutting mode for production, the production mode is suitable for a few production requirements, but the original production mode is not enough to meet the requirements on productivity and is not uniform in quality along with the increasingly popular requirements of huqin instruments. The bamboo bow is made of bamboo, which is made by combining organic matter and inorganic matter, and has unstable physical performance and chemical performance and poor weather resistance.

The bow of the present invention has; the bow rod is straight, elastic, has proper bending degree, good elasticity, light weight, toughness (good bending strength), proper balance point position and proper weight. The player can freely operate the Huqin when playing the Huqin, so that the player can feel at will, exert the skills fully and express the content emotion of the musical works. In particular to a bow which can be directly cleaned and flexibly replaced by bow hair. The shape of the fiddle bow of the invention is consistent with the shape of the traditional fiddle bow, and the use habit of the user is reserved.

Compared with the prior art, the fiddle bow of the invention has the advantages that: the weight is reduced, the bow is transported flexibly, and the organ sound is full. When the player carries the bow, the finger can play the bow hair with light pressure and the inner and outer strings, and the invention can realize the change. On the premise of not increasing cost, the controllability, stability and flexibility of the bow and the bow hair are obviously improved, the playing stress of each part of the bow is balanced, and the operation is smoother and better.

The invention can form a series of products with the technical standard of the fiddle bow, and the unified industry standard is beneficial to the high-quality large-scale mass production of the fiddle bow.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention.

Claims

1. A method for manufacturing a Huqin bow with a standardized adjustable center of gravity point is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: the bow rod nose piece (3) is molded; the external shape of the bow rod front end piece (3) is similar to a number '7', the front end of the bow rod front end piece (3) is bent and tilted, the rear end of the bow rod front end piece (3) is straight, and the section of the rear end of the bow rod front end piece (3) is rectangular; the bow rod nose piece (3) is formed by the following steps: lay on bow pole front end piece shaping frock (1): the carbon fiber prepreg is 88mm wide and 750mm long, the spreading height of the carbon fiber prepreg is low in the front and high in the back, the change range of the height from front to back is 2.5-4mm, the spreading thickness of each layer of carbon fiber prepreg is 0.1mm, and 25-40 layers are always spread; the method comprises the following steps of (1) additionally arranging a high-temperature-resistant film bag on a bow rod front end piece forming tool (1), pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the laid carbon fiber prepreg, putting the bow rod front end piece forming tool (1) into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, and curing and forming the laid carbon fiber prepreg for 60-300 min; taking out the bow rod front end piece forming tool (1) after the temperature in the vacuum hot pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag on the bow rod front end piece forming tool (1), taking down the cured and formed carbon fiber prepreg plate, and cutting the carbon fiber prepreg plate into bow rod front end pieces (3) with the width of 8mm, the length of 650mm and the height of the same as the change range of the layer height of the carbon fiber prepreg;

step two: the bow rod nose piece (3) is provided with openings and grooves and is subjected to surface treatment: defining the bent end of the bow rod front end piece (3) as the front upper end of the bow rod front end piece (3), opening a rectangular opening at the position 2-6mm away from the top of the front upper end of the bow rod front end piece (3), wherein the length of the rectangular opening is 5-7mm, the width of the rectangular opening is 2-4mm, a bow hair bundle penetrates through the rectangular opening, and a rectangular groove is formed in the rear end face of the bow rod front end piece (3) for connecting with the bow rod rear end piece; performing finish treatment on the surface of the bow rod nose piece (3) to enable the finish to reach more than Ra0.05;

step three: forming and surface treating a rear end piece of the bow rod: a curved metal hollow pipe (2) needs to be prefabricated, a gradual change section is arranged at the front end of the curved metal hollow pipe (2), the shape of the cross section of the gradual change section is consistent with that of the cross section of the rear end of the bow rod front end piece (3) and is also rectangular, the rest part of the curved metal hollow pipe (2) except the gradual change section is a circular pipe, and a metal pin shaft matched with the rectangular groove is arranged at the front end of the gradual change section of the curved metal hollow pipe (2); winding carbon fiber fabric prepreg with fabric fiber tows of more than 3K on the outer surface of a metal curved hollow pipe (2), additionally installing a high-temperature resistant film bag, pumping negative pressure to 0.5-1.5MPa by using a vacuum nozzle, compacting the carbon fiber fabric prepreg wound on the outer surface of the metal curved hollow pipe (2), putting the metal curved hollow pipe (2) into a vacuum hot-pressing tank, heating to 90-180 ℃, pressurizing to 0.5-10MPa, curing and molding the wound carbon fiber fabric prepreg for 60-300min, taking out a bow rod rear end piece formed part after the temperature in the vacuum hot-pressing tank is reduced to 40-60 ℃, removing the high-temperature resistant film bag, and performing finish treatment on the surface of the bow rod rear end piece formed part to enable the finish to reach more than Ra0.05 to prepare the bow rod rear end piece;

step four: assembling the bow rod: tightly inserting a metal pin shaft of the rear end piece of the bow rod into a rectangular groove on the rear end face of the front end piece (3) of the bow rod to form the bow rod;

step seven: assembling the fiddle bow: firstly, sleeving a section of heat-shrinkable tube I on a bow rod of a bow, enabling one end of bow hair to penetrate through a rectangular opening at the upper end of a bow rod front end part (3) and then to be folded downwards by 10-15mm, winding the downward folded part of the bow hair by using a plurality of loops of wires to enable the downward folded part of the bow hair to be wound with the bow rod, moving the heat-shrinkable tube to sleeve the downward folded part of the bow hair, and then heating and shrinking the heat-shrinkable tube I to restrain the bow hair and the bow rod of the downward folded part; then, the bow fish is moved to the foremost end of the rectangular hole, the other end of the bow hair is wound on the bow fish hook to be folded, the bent part of the bow hair is wound by a plurality of circles of wires to be wound with the bow rod, the bent part of the bow hair is sleeved by the heat-shrinkable tube, the heat-shrinkable tube II is heated to shrink the bent part of the bow hair, and finally the movable bolt is rotated to enable the bow hair to reach a specified tension value.

2. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the first step, fabric fiber tows of the carbon fiber fabric prepregs on the lowest layer and the uppermost layer are laid by more than 3K, the middle layer is laid by the carbon fiber unidirectional prepregs, and the carbon fiber unidirectional prepregs on the middle layer are sequentially laid from the lower layer to the upper layer in the order of 0 degree, 90 degrees, 45 degrees and-45 degrees until the laying thickness reaches the required height.

3. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the second step, the surface of the bow rod nose piece (3) is subjected to finish treatment, and the method specifically comprises the following steps: spraying a layer of primer on the outer surface of the bow rod front end piece (3), polishing once after drying for 2-4 hours until the finish degree reaches more than Ra0.1, spraying a layer of matte finish paint, and polishing once after drying for 2-4 hours until the finish degree reaches more than Ra0.05.

4. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the third step, the length of the transition section of the metal curved hollow pipe (2) is 10mm-30mm, the length of the round pipe of the metal curved hollow pipe (2) is 100mm-250mm, the diameter of the outer circular surface is 6mm-8mm, and the wall thickness is 1.5-3 mm.

5. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the third step, the surface of the bow rod rear end piece forming part is subjected to finish treatment, and the method specifically comprises the following steps: and spraying a layer of primer on the outer surface of the rear end piece of the bow rod, polishing after drying for 2-4 hours until the finish degree reaches more than Ra0.1, spraying a layer of matte finish, and polishing after drying for 2-4 hours until the finish degree reaches more than Ra0.05.

6. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the fifth step, fabric fiber tows of the carbon fiber fabric prepregs on the lowest layer and the uppermost layer are laid by more than 3K, the middle layer is laid by the carbon fiber unidirectional prepregs, and the carbon fiber unidirectional prepregs on the middle layer are sequentially laid from the lower layer to the upper layer in the laying angle of 0 degree, 90 degrees, 45 degrees and-45 degrees until the laying thickness reaches the required height (aiming at improving the stability of the croaker).

7. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: in the fifth step, the surface of the bow fish forming piece is subjected to finish treatment, and the method specifically comprises the following steps: spraying a layer of primer on the surface of the bow fish molded part, polishing after 2-4h drying until the finish degree reaches more than Ra0.1, spraying a layer of matte finish, and polishing after 2-4h drying until the finish degree reaches more than Ra0.05.

8. A method of forming a fiddle bow having a standardized adjustable center of gravity point as recited in claim 1 wherein: step seven, heating the first heat-shrinkable tube at the temperature of 55-85 ℃ for 5-15 s; and heating the second heat-shrinkable tube at 55-85 ℃ for 5-15 s.