A spinning forming equipment and forming method for a brass trumpet instrument

Abstract

The present invention discloses a spinning forming equipment and a forming method for a brass trumpet instrument. The spinning forming equipment includes a bell-mouth forming equipment and an integral forming equipment; the bell-mouth forming equipment includes a bell-mouth forming mold, a bell-mouth forming rotary wheel assembly and a bell-mouth forming tail top mold, which can spin-form the bell-mouth part of the brass wind instrument; the integral forming equipment includes an integral forming mold, an integral forming rotary wheel assembly and an integral forming tail top mold, which can spin-form the integral brass trumpet instrument after the bell-mouth part and the long tube part are welded. The spinning forming equipment can spin-form the bell-mouth part of the trumpet instrument and the integral trumpet instrument respectively, and produce trumpet instruments that meet the requirements. The forming method of the brass trumpet instrument of the present invention, based on the spinning forming equipment of the brass trumpet instrument, can realize the large-scale production of trumpet instruments, and the consistency and production efficiency of the finished trumpet instruments are high.

Description

Technical Field

[0001] The invention relates to the technical field of copper wind instrument preparation, and in particular to a copper wind instrument spinning forming equipment and a forming method. Background Art

[0002] Musical instruments, as one of the greatest inventions in the history of human civilization, have become a non-verbal communication tool. Among Western musical instruments, the production of trumpets is limited by their materials and craftsmanship. They cannot be manufactured as quickly as string instruments such as pianos and violins. During the production process, the timbre and appearance of the instruments need to be achieved through the pitch and craftsmanship of the "master". This undoubtedly greatly limits the popularity and use of trumpets.

[0003] At present, the tubes of musical instruments such as trumpets are generally formed by artificial film tapping, and stamping technology is also used appropriately. However, since most of the materials of musical instruments such as trumpets are brass, if appropriate stress relief technology is not carried out, the materials will deform, crack, and fail during the processing of artificial film tapping or later placement. Due to the process limitations of the stamping process, the overall process is cumbersome and the cost remains high.

[0004] Therefore, developing a method for mass-producing horn-like instruments that meet the requirements quickly is of great significance to the popularization and application of horn-like instruments and has become an urgent problem to be solved. Summary of the invention

[0005] In order to solve the problem in the prior art that trumpet instruments cannot be mass-produced using existing molding processes due to limitations on materials and processes, the present invention provides a copper trumpet instrument spinning molding equipment for spinning molding of trumpet instruments.

[0006] The purpose of the present invention is also to provide a method for forming a brass horn instrument, so as to achieve efficient production of the horn instrument.

[0007] The purpose of the present invention is achieved through the following technical solutions.

[0008] A spinning forming equipment for a brass trumpet instrument, including a bell mouth forming equipment and an integral forming equipment;

[0009] The bell-mouth forming equipment comprises a bell-mouth forming die, a bell-mouth forming rotary wheel assembly and a bell-mouth forming tail top die, and can perform spinning forming on the bell-mouth part of a brass wind instrument;

[0010] The integral forming equipment comprises an integral forming die, an integral forming spinning wheel assembly and an integral forming tail top die, and can perform spinning forming on the integral copper horn musical instrument after the bell mouth part and the long tube part are welded.

[0011] Preferably, the bell-mouth forming die is provided with a material withdrawal and air blowing hole which penetrates along the axial direction.

[0012] Preferably, the bell-mouth forming mold and the integral forming mold both have an appearance corresponding to the bell-mouth part.

[0013] More preferably, the small-diameter end of the integral molding die further has an extension portion, and the extension portion has an appearance corresponding to the opening of the large-diameter end of the long tube portion.

[0014] More preferably, a knife avoidance platform is provided on the end portion of the bell-mouth forming tail top mold close to the bell-mouth forming mold; the knife avoidance platform is a stepped platform whose outer diameter gradually decreases in the direction away from the bell-mouth forming mold; and the end faces of the knife avoidance platform and the bell-mouth forming mold that are close to each other are end faces of the same size.

[0015] More preferably, a side of the knife avoidance platform facing away from the bell-mouth forming mold is connected to a knife avoidance coupling portion; an outer diameter of the knife avoidance coupling portion is the same as an outer diameter of a top surface of the knife avoidance platform.

[0016] More preferably, the integral forming mold is provided with a material ejection assembly; the material ejection assembly comprises a material ejection rod and a positioning material ejection head; the material ejection rod is axially arranged on the integral forming mold and can be extended and retracted along the axial direction; the positioning material ejection head is fixedly connected to the end of the material ejection rod and is located on a side of the integral forming mold facing the integral forming tail ejection mold;

[0017] The positioning ejecting head has an appearance corresponding to one end of the long tube part connected to the bell mouth part.

[0018] More preferably, the positioning ejecting head has an assembly head protruding toward the integral forming mold, and the integral forming mold is concavely provided with an assembly groove corresponding to the assembly head; the assembly head is positioned and inserted in the assembly groove.

[0019] Preferably, the integrally formed tail top mold has a limiting notch on one end facing the integrally formed mold; and the end of the long tube portion away from the bell-mouth portion can be inserted and limited in the limiting notch.

[0020] A method for forming a brass trumpet instrument, using any of the above-mentioned spinning forming equipment for a brass wind instrument to perform spinning forming, comprising the following steps:

[0021] (1) Spinning of the bell mouth

[0022] (1-1) placing a copper sheet on the bell-mouth forming die, and moving the bell-mouth forming tail top die toward the bell-mouth forming die until the copper sheet is pressed against the bell-mouth forming die;

[0023] (1-2) The spinning work starts, the bell-mouth forming mold and the bell-mouth forming tail top mold rotate synchronously, driving the copper sheet to rotate synchronously; the bell-mouth forming rotary wheel assembly moves to spin the copper sheet;

[0024] (1-3) When the axial length of the blank workpiece reaches 2 / 5 of the axial length of the finished bell-mouth part, the spinning is stopped to complete the first forming spinning; the blank workpiece is taken out and subjected to the first stress relief annealing;

[0025] (1-4) After cooling, continue spinning; when the axial length of the blank workpiece reaches 4 / 5 of the axial length of the finished bell mouth part, stop spinning and complete the second forming spinning; take out the blank workpiece and perform the second stress relief annealing;

[0026] (1-5) After cooling, continue the third spinning process until the blank of the bell mouth portion with a sealed bottom edge is formed;

[0027] (1-6) removing burrs, and then cutting off the sealing bottom cover of the bell mouth blank to complete the forming of the bell mouth;

[0028] (1-7) The spinning is stopped, and the bell mouth forming spinning wheel assembly and the bell mouth forming tail top mold are reset;

[0029] (1-8) removing the formed bell mouth part workpiece to obtain the bell mouth part;

[0030] (2) Long tube part molding

[0031] (2-1) directly forming the copper sheet material by coil welding to obtain the long tube portion;

[0032] (3) Overall welding

[0033] (3-1) welding the small diameter end of the bell portion to the long tube portion to obtain a blank of an integral brass horn instrument;

[0034] (4) Overall spinning

[0035] (4-1) placing the blank of the integral brass trumpet instrument on the integral forming die, and tightening and fixing it with the integral forming tail top die;

[0036] (4-2) The spinning work starts, the integral forming mold and the integral forming tail top mold rotate synchronously, driving the integral copper horn instrument blank to rotate synchronously; the integral forming spinning wheel assembly moves, and the integral copper horn instrument blank is spun as a whole;

[0037] (4-3) After the forming and spinning is completed, the end of the bell mouth is curled;

[0038] (4-4) the spinning is stopped, and the integrally formed spinning wheel assembly and the integrally formed tail top mold are reset;

[0039] (4-5) Remove the formed brass horn instrument by unloading and unloading, thus completing the spinning forming of the brass horn instrument.

[0040] Preferably, the copper sheet material is a brass sheet material.

[0041] Preferably, the first stress relief annealing and the second stress relief annealing are: heating in a heating furnace at 250-260° C. for 20 minutes and then naturally cooling in the heating furnace; or, heating in a heating furnace at 300° C. for 8-10 minutes and then naturally cooling in the air.

[0042] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0043] The copper horn instrument spinning forming equipment of the present invention includes bell-mouth molding equipment and integral molding equipment, which can respectively perform spinning processing on the bell-mouth part of the horn instrument and the entire horn instrument. Based on the spinning forming equipment, horn instruments that meet the needs can be produced, and the processing and production efficiency is high, and large-scale production of horn instruments can be easily realized.

[0044] The brass horn instrument forming method of the present invention is based on the copper horn instrument spinning forming equipment, which eliminates the problems of deformation, cracking, complicated process, high cost and the like in the existing production process, and breaks through the difficulty that horn instruments cannot be mass-produced due to the limitation of materials and processes. The overall forming process of the entire horn instrument can be completed by using spinning, coil welding, trimming, curling and other processes, and the consistency and production efficiency of the finished horn instrument are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the bell mouth forming equipment in a specific embodiment;

[0046] Figure 2 It is a structural schematic diagram of the integral forming equipment in a specific embodiment;

[0047] Figure 3a to Figure 3i It is a schematic diagram of the operation structure of material discharge, material top, first forming spinning, first stress relief annealing, second forming spinning, second stress annealing, third forming spinning, bottom edge cutting and material discharge respectively in the spinning forming of the bell mouth part in a specific embodiment;

[0048] Figure 4 It is a schematic diagram of the structure of the long tube part of coil welding;

[0049] Figure 5 It is a structural schematic diagram of the welding of the bell mouth part and the long tube part;

[0050] Figure 6a to Figure 6e It is a schematic diagram of the operation structure of loading, pushing, shaping spinning, curling and withdrawing of the integral spinning forming in a specific embodiment;

[0051] Figures are marked: 1- bell mouth forming equipment, 11- bell mouth forming mold, 110- material withdrawal blowing hole, 12- bell mouth forming rotary wheel assembly, 13- bell mouth forming tail top mold, 131- knife avoidance platform, 132- knife avoidance connecting shaft, 14- deburring knife, 15- bottom cover cutting knife, 2- overall forming equipment, 21- overall forming mold, 210- assembly groove, 22- overall forming rotary wheel assembly, 23- overall forming tail top mold, 230- limiting groove, 24- ejector assembly, 241- ejector rod, 242- positioning ejector head, 2420- assembly head, 25- curling knife, 3- overall copper trumpet musical instrument workpiece, 301- bell mouth part, 302- long tube part, 303- welding part, 4- copper sheet material. DETAILED DESCRIPTION

[0052] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments, but the protection scope and implementation mode of the present invention are not limited thereto. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "left", "right", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or is the orientation or positional relationship in which the product of the invention is usually placed when used, and is only used to distinguish the description, only for the convenience and simplification of the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention, let alone an indication or implication of relative importance.

[0053] The spinning forming equipment for a brass horn musical instrument of the present invention comprises a bell mouth forming equipment 1 and an integral forming equipment 2.

[0054] See also Figure 1 As shown, the bell-mouth forming equipment 1 includes a bell-mouth forming mold 11, a bell-mouth forming rotating wheel assembly 12 and a bell-mouth forming tail top mold 13. The bell-mouth forming equipment 1 can perform spin forming on the bell-mouth part 301 of the brass wind instrument.

[0055] Among them, one end of the bell-mouth forming mold 11 is a flange connection end of the spinning spindle, which is connected to the spinning spindle through the connecting flange during operation, and the bell-mouth forming mold 11 can be driven to rotate through the spinning spindle; the other end of the bell-mouth forming mold 11 is a working end, which can load the spinning blank. The bell-mouth forming tail top mold 13 is arranged on the side of the bell-mouth forming mold 11 away from the flange connection end of the spinning spindle, and the bell-mouth forming tail top mold 13 can move closer to or away from the bell-mouth forming mold 11. The bell-mouth forming rotary wheel assembly 12 is arranged on the outside of the bell-mouth forming mold 11, and can move closer to or away from the bell-mouth forming mold 11; specifically, the bell-mouth forming rotary wheel assembly 12 includes a rotary wheel rod, and a rotary wheel installed on the rotary wheel rod that can rotate freely through the rotary wheel shaft.

[0056] As the spinning mold of the bell mouth part 301, the bell mouth molding mold 11 has an appearance corresponding to the bell mouth part 301, that is, has a bell mouth appearance. During the spinning operation, the sheet material can be spun according to the appearance of the bell mouth molding mold 11, so that the bell mouth part 301 that meets the requirements can be obtained.

[0057] In addition, a material removal blowing hole 110 is provided on the bell-mouth forming mold 11. During the forming process, according to the process setting, when the workpiece blank needs to be subjected to stress relief annealing, air can be blown from the left end of the material removal blowing hole 110 to blow off the workpiece blank and facilitate material removal.

[0058] In a preferred embodiment, a knife avoidance platform 131 is provided on one end of the bell-mouth forming tail top die 13 close to the bell-mouth forming die 11. Specifically, the knife avoidance platform 131 is a stepped platform whose outer diameter gradually decreases in a direction away from the bell-mouth forming die 11, and the end faces of the knife avoidance platform 131 and the bell-mouth forming die 11 close to each other are end faces of the same size, that is, the bottom end face of the knife avoidance platform 131 is the same size as the small diameter end face of the bell-mouth forming die 11.

[0059] Furthermore, the side of the knife avoidance platform 131 facing away from the bell-mouth forming mold 11 is connected to the knife avoidance connecting portion 132, and the knife avoidance platform 131 is connected to the main mold part of the bell-mouth forming tail top mold 13 through the knife avoidance connecting portion 132, and the outer diameter of the knife avoidance connecting portion 132 is the same as the outer diameter of the top end surface of the knife avoidance platform 131.

[0060] In this way, the knife avoidance platform 131 and the knife avoidance shaft connecting part 132 of the bell-mouth forming tail top die 13 are both structures with outer diameters smaller than the outer diameter of the small-diameter end of the bell-mouth forming die 11. When the bell-mouth portion 301 is subjected to spin forming, the small-diameter end of the bell-mouth portion 301 is sleeved on the small-diameter end of the bell-mouth forming die 11. Since the knife avoidance platform 131 and the knife avoidance shaft connecting part 132 do not protrude from the small-diameter end of the bell-mouth forming die 11 in the radial direction, that is, the top material contact end of the bell-mouth forming tail top die 13 does not protrude from the small-diameter end of the bell-mouth forming die 11 in the radial direction, the bell-mouth forming rotary wheel assembly 12 will not be interfered by the bell-mouth forming tail top die 13 when performing positioning spin forming on the small-diameter end of the bell-mouth portion 301, thereby smoothly completing the spin forming of the bell-mouth portion 301.

[0061] See also Figure 2 As shown, the integral forming equipment 2 includes an integral forming mold 21, an integral forming wheel assembly 22 and an integral forming tail top mold 23. The integral forming equipment 2 can perform spin forming on the integral copper horn instrument after the bell mouth part 301 and the long tube part 302 are welded.

[0062] Among them, one end of the integral forming mold 2 is a flange connection end of the spinning spindle, which is connected to the spinning spindle through the connecting flange during operation, and the integral forming mold 2 can be driven to rotate through the spinning spindle; the other end of the integral forming mold 2 is a working end, which can load the spinning blank. The integral forming tail top mold 23 is arranged on the side of the integral forming mold 21 away from the flange connection end of the spinning spindle, and the integral forming tail top mold 23 can move closer to or away from the integral forming mold 21. The integral forming rotary wheel assembly 22 is arranged on the outside of the integral forming mold 21, and can move closer to or away from the integral forming mold 21; specifically, the integral forming rotary wheel assembly 22 includes a rotary wheel rod, and a rotary wheel installed on the rotary wheel rod that can rotate freely through the rotary wheel shaft.

[0063] During the integral spinning, the bell portion 301 of the integral trumpet instrument workpiece is loaded on the integral molding die 21 and is spin-molded according to the shape of the integral molding die 21. Accordingly, the integral molding die 21 is designed to have a shape corresponding to the bell portion 301, that is, a bell shape, so that the bell portion 301 can be spun into a structure that meets the requirements according to the shape of the integral molding die 21.

[0064] Furthermore, in order to ensure that the welding portion 303 between the bell mouth portion 301 and the long tube portion 302 can be effectively spun during the integral spinning process and to effectively avoid the spinning fracture of the weld portion 303, an integrally extended extension portion is also provided at the small diameter end of the integral molding die 21. The extension portion has an appearance corresponding to the opening of the large diameter end of the long tube portion 302. During the integral spinning, the bell mouth portion 301 of the integral trumpet instrument workpiece is sleeved on the integral molding die 21, and the weld portion 303 is correspondingly located at the large diameter of the extension portion.

[0065] Further preferably, a material ejection assembly 24 is also provided on the integral molding die 21. Specifically, the material ejection assembly 24 includes a material ejection rod 241 and a positioning material ejection head 242. The material ejection rod 241 is axially arranged on the integral molding die 21 and can be extended and retracted left and right along the axial direction; the positioning material ejection head 242 is fixedly connected to the end of the material ejection rod 241 and is located on the side of the integral molding die 21 facing the integral molding tail ejection die 23.

[0066] Optionally, the positioning ejecting head 242 has an assembly head 2420 protruding toward the integral molding mold 21, and the integral molding mold 21 is recessed with an assembly groove 210 corresponding to the assembly head 2420, and the assembly head 2420 is positioned and plugged into the assembly groove 210, so that the positioning ejecting head 242 can be telescopically positioned and plugged into the small diameter end of the integral molding mold 21.

[0067] Moreover, the positioning ejecting head 242 has an end connected to the bell-mouth portion 301 of the long tube portion 302 , that is, an appearance corresponding to the large-diameter end of the long tube portion 302 .

[0068] In this way, when the integral brass horn musical instrument workpiece is loaded on the integral forming mold 21, the large diameter end of the long tube portion 302 of the integral brass horn musical instrument workpiece is tightly sleeved on the positioning ejector head 242, and during the forming spinning process, the spinning can be performed according to the appearance of the positioning ejector head 242. After the spinning is completed, the ejector rod 241 is pushed to the right to eject the positioning ejector head 242 to the right, and the spun integral horn musical instrument can be ejected and unloaded, thereby facilitating material removal.

[0069] In addition, a limiting notch 230 is provided on one end of the integral forming tail top mold 23 facing the integral forming mold 21, wherein the end of the long tube portion 302 away from the bell portion 301 can be inserted and limited in the limiting notch 230, that is, the small diameter end of the long tube portion 302 can be inserted and limited in the limiting notch 230. When the integral spinning forming top material is performed, the bell portion 301 of the integral copper horn instrument workpiece is loaded and sleeved on the integral forming mold 21, and then the integral forming tail top mold 23 moves from right to left close to the small diameter end of the long tube portion 302, and the small diameter end of the long tube portion 302 is limited and inserted in the limiting notch 230, and the integral forming tail top mold 23 continues to move rightward until the integral horn instrument workpiece is tightly pressed.

[0070] Example 1

[0071] The brass trumpet instrument molding method of the present invention specifically uses brass H68 to make the brass trumpet instrument, and uses the above-mentioned copper wind instrument spinning molding equipment to perform spinning molding, including the following steps:

[0072] (1) Spinning of the bell mouth

[0073] (1-1) Place the brass sheet 4 on the bell-mouth forming die 11, see Figure 3a The bell-shaped tail top die 13 moves to the left close to the bell-shaped die 11 until the top presses the brass sheet 4, see Figure 3b As shown;

[0074] (1-2) The spinning work starts, the bell-mouth forming mold 11 and the bell-mouth forming tail top mold 13 rotate synchronously, driving the brass sheet 4 to rotate synchronously; the bell-mouth forming rotary wheel assembly 12 moves to spin the brass sheet 4;

[0075] (1-3) When the axial length of the blank workpiece (the length along the left and right axial directions shown in the figure) reaches 2 / 5 of the axial length of the finished product of the bell mouth portion 301, the spinning is stopped to complete the first forming spinning. Figure 3c As shown; blowing air through the material removal blowing hole 110 to remove the blank workpiece and perform the first stress relief annealing, see Figure 3d As shown;

[0076] Preferably, the first stress relief annealing is: heating in a heating furnace at 250-260° C. for 20 minutes, and then naturally cooling in the heating furnace; or, heating in a heating furnace at 300° C. for 8-10 minutes, and then naturally cooling in the air.

[0077] (1-4) After cooling, continue spinning; when the axial length of the blank workpiece reaches 4 / 5 of the axial length of the finished product of the bell mouth portion 301, stop spinning and complete the second forming spinning, see Figure 3e As shown; blowing air through the material removal blowing hole 110 to remove the blank workpiece, and perform the second stress relief annealing, see Figure 3f As shown;

[0078] Preferably, the second stress relief annealing is: heating in a heating furnace at 250-260° C. for 20 minutes, and then naturally cooling in the heating furnace; or, heating in a heating furnace at 300° C. for 8-10 minutes, and then naturally cooling in the air.

[0079] (1-5) After cooling, continue the third spinning process. Figure 3g As shown, until the blank forming of the bell mouth portion 301 having a sealed bottom edge is completed;

[0080] (1-6) Deburring is performed using a deburring knife 14, and then a bottom cover cutting knife 15 is used to cut off the sealing bottom cover of the blank of the bell mouth portion 301. Figure 3h As shown, the bell mouth portion 301 is formed;

[0081] (1-7) The spinning is stopped, and the bell mouth forming rotary wheel assembly 12 and the bell mouth forming tail top mold 13 are reset;

[0082] (1-8) Demolding and removing the workpiece of the bell mouth portion that has been formed to obtain the hollow bell mouth portion 301, see Figure 3i As shown;

[0083] (2) Long tube part molding

[0084] (2-1) Directly shape the brass sheet by coil welding, see Figure 4 As shown, the long tube portion 302 is obtained;

[0085] (3) Overall welding

[0086] (3-1) Weld the small diameter end of the bell mouth part 301 to the large diameter end of the long tube part 302. Figure 5 As shown, the whole copper horn musical instrument workpiece 3 is obtained;

[0087] (4) Overall spinning

[0088] (4-1) The integral copper horn instrument workpiece 3 is mounted on the integral forming die 21. Figure 6aAs shown, the weld portion 303 of the integral copper horn instrument workpiece 3 corresponds to the extension portion of the integral forming mold 21; and is tightly fixed by the integral forming tail top mold 23, see Figure 6b As shown;

[0089] (4-2) The spinning work starts, the integral forming mold 21 and the integral forming tail top mold 23 rotate synchronously, driving the integral trumpet instrument workpiece 3 to rotate synchronously; the integral forming spinning wheel assembly 22 moves, and the integral copper trumpet instrument workpiece 3 is spun as a whole. Figure 6c As shown;

[0090] The spinning of the integrally formed spinning wheel assembly 22 at the corresponding integrally formed mold 21 and the positioning ejector head 242 is molded spinning, and the spinning of the long tube portion 302 between the integrally formed mold 21 and the integrally formed tail ejector mold 23 is moldless spinning.

[0091] (4-3) After the forming and spinning is completed, the end of the bell mouth is curled with a curling knife 25, see Figure 6d As shown;

[0092] (4-4) The spinning is stopped, and the integrally formed spinning wheel assembly 22 and the integrally formed tail top mold 23 are both reset;

[0093] (4-5) The ejector assembly 24 ejects the formed brass horn instrument and removes the formed brass horn instrument. Figure 6e As shown, the spinning forming of the brass horn instrument is completed.

[0094] Preferably, the first stress relief annealing and the second stress relief annealing are: heating in a heating furnace at 250-260° C. for 20 minutes and then naturally cooling in the heating furnace; or, heating in a heating furnace at 300° C. for 8-10 minutes and then naturally cooling in the air.

[0095] The technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, this specification does not describe all possible combinations of the technical features in the above-described embodiments. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Moreover, the above-described embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention.

[0096] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for forming a brass trumpet instrument, characterized in that: Spinning is performed using a copper horn instrument spinning forming equipment, the copper horn instrument spinning forming equipment comprising a bell mouth forming equipment and an integral forming equipment; The bell-mouth forming equipment comprises a bell-mouth forming die, a bell-mouth forming rotary wheel assembly and a bell-mouth forming tail top die, and is used for spinning the bell-mouth part of a brass trumpet instrument; The integral forming equipment includes an integral forming mold, an integral forming spinning wheel assembly and an integral forming tail top mold, which are used to spin-form the integral copper horn instrument after the bell mouth part and the long tube part are welded; The brass horn instrument molding method comprises the following steps: (1) Spinning of the bell mouth (1-1) placing a copper sheet on the bell-mouth forming die, and moving the bell-mouth forming tail top die toward the bell-mouth forming die until the copper sheet is pressed against the bell-mouth forming die; (1-2) The spinning work starts, the bell-mouth forming mold and the bell-mouth forming tail top mold rotate synchronously, driving the copper sheet to rotate synchronously; the bell-mouth forming rotary wheel assembly moves to spin the copper sheet; (1-3) When the axial length of the blank workpiece reaches 2 / 5 of the axial length of the bell-mouth part of the finished product, the spinning is stopped to complete the first forming spinning; the blank workpiece is taken out and the first stress relief annealing is performed; (1-4) After cooling, continue spinning; when the axial length of the blank workpiece reaches 4 / 5 of the axial length of the finished bell mouth part, stop spinning and complete the second forming spinning; take out the blank workpiece and perform the second stress relief annealing; (1-5) After cooling, continue the third spinning process until the blank of the bell mouth portion with a sealed bottom edge is formed; (1-6) removing burrs, and then cutting off the sealing bottom cover of the bell mouth blank to complete the forming of the bell mouth; (1-7) The spinning is stopped, and the bell mouth forming spinning wheel assembly and the bell mouth forming tail top mold are reset; (1-8) removing the finished bell portion from the molded product to obtain the bell portion of the brass trumpet instrument; (2) Long tube part molding (2-1) directly forming the copper sheet material by coil welding to obtain the long tube portion; (3) Overall welding (3-1) welding the small diameter end of the bell portion to the long tube portion to obtain a blank of an integral brass horn instrument; (4) Overall spinning (4-1) placing the blank of the integral brass trumpet instrument on the integral forming die, and tightening and fixing it with the integral forming tail top die; (4-2) The spinning work starts, the integral forming mold and the integral forming tail top mold rotate synchronously, driving the integral copper horn instrument blank to rotate synchronously; the integral forming spinning wheel assembly moves, and the integral copper horn instrument blank is spun as a whole; (4-3) After the forming and spinning is completed, the end of the bell mouth is curled; (4-4) the spinning is stopped, and the integrally formed spinning wheel assembly and the integrally formed tail top mold are reset; (4-5) Remove the formed brass horn instrument by unloading and unloading, thus completing the spinning forming of the brass horn instrument.

2. The method for forming a brass trumpet instrument according to claim 1, characterized in that: The first stress relief annealing and the second stress relief annealing are: heating in a heating furnace at 250-260° C. for 20 minutes and then naturally cooling in the heating furnace; or heating in a heating furnace at 300° C. for 8-10 minutes and then naturally cooling in the air.

3. The method for forming a brass trumpet instrument according to claim 1, characterized in that: The bell mouth forming die is provided with a material withdrawal and air blowing hole which penetrates along the axial direction.

4. The method for forming a brass trumpet instrument according to claim 1, characterized in that: The bell-mouth forming mold and the integral forming mold both have an appearance corresponding to the bell-mouth part.

5. The method for forming a brass trumpet instrument according to claim 4, characterized in that: A knife avoidance platform is provided on the end portion of the bell-mouth forming tail top mold close to the bell-mouth forming mold; the knife avoidance platform is a stepped platform whose outer diameter gradually decreases in the direction away from the bell-mouth forming mold; and the end faces of the knife avoidance platform and the bell-mouth forming mold that are close to each other are end faces of the same size.

6. The method for forming a brass trumpet instrument according to claim 5, characterized in that: The side of the knife avoidance platform which is away from the bell-mouth forming mold is connected to a knife avoidance shaft connecting portion; the outer diameter of the knife avoidance shaft connecting portion is the same as the outer diameter of the top surface of the knife avoidance platform.

7. The method for forming a brass trumpet instrument according to claim 4, characterized in that: The integral forming mold is provided with a material ejection assembly; the material ejection assembly comprises a material ejection rod and a positioning material ejection head; the material ejection rod is axially arranged on the integral forming mold and can be extended and retracted along the axial direction; the positioning material ejection head is fixedly connected to the end of the material ejection rod and is located on a side of the integral forming mold facing the integral forming tail ejection mold; The positioning ejecting head has an appearance corresponding to one end of the long tube part connected to the bell mouth part.

8. The method for forming a brass trumpet instrument according to claim 7, characterized in that: The positioning ejecting head is provided with an assembly head protruding toward the integral forming mold, and the integral forming mold is provided with an assembly groove corresponding to the assembly head; the assembly head is positioned and inserted in the assembly groove.

9. The method for forming a brass trumpet instrument according to claim 1, characterized in that: The end of the integral forming tail top mold facing the integral forming mold is provided with a limiting notch; the end of the long tube part away from the bell-mouth part is inserted and limited in the limiting notch.

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