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Integral welding-free forming process for belled mouth and body of brass instrument

A molding process and bell mouth technology, which is applied in the processing field of western wind instruments, can solve the problems of internal quality (sound quality, intonation, timbre influence, occurrence of blisters, influence on appearance, etc.), and achieve stable vibration frequency, lower product cost and more beautiful timbre Effect

Inactive Publication Date: 2002-07-10
史占秋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the above process is that the surface of the pipe body will have sand holes and unevenness due to welding
This production method not only affects the appearance of the wind instrument due to weld seams, but also affects the internal quality (sound quality, intonation, and timbre)

Method used

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  • Integral welding-free forming process for belled mouth and body of brass instrument
  • Integral welding-free forming process for belled mouth and body of brass instrument
  • Integral welding-free forming process for belled mouth and body of brass instrument

Examples

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Embodiment 1

[0022] Embodiment 1: Utilize the method of the present invention to make palm horn bell mouth and body:

[0023] 1. Cutting material:

[0024] According to the weight and material thickness of the bell mouth and body of the palm number, calculate the diameter φ of the drawing blank according to the following formula:

[0025] Material thickness d = 0.7mm (using H68 brass sheet), calculated by φ = 200mm, and according to figure 2 Ask for blanking.

[0026] 2. Stretch and shape step by step until the bell mouth and the prototype of the body are formed:

[0027] 1. Stretch into a barrel shape for the first time (see image 3 ), first anneal the round billet in an electric furnace at 500-650°C, air cool to room temperature, stretch the round billet into a drum shape, and the outer diameter of the drum is φ 1 =110mm (take the stretch coefficient as m 1 =0.55), in this embodiment, the outer diameter φ of the drum 1 Just coincide with the maximum diameter of the bell mouth φ...

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Abstract

The key point of the present invention is to form belled mouth and main body of brass instrument through stepped drawing process. Before each drawing, the workpiece is annealed. From the second drawing on, one certain height is remained depending on the drawn area. The drawn belled mouth and main body is then further processed with a steel spindle, rolling pole similar tool. The brass instrument thus produced has homogeneous stress, stable vibration frequency, round and accurate tone quality.

Description

technical field [0001] The invention relates to a processing method of a western wind instrument, in particular to a processing method suitable for a bell mouth and a body. Background technique [0002] At present, the bell mouth and the body of the brass instrument are processed separately and then welded together. The production process of the body is to use a thin copper plate to cut the material, and then make the body through the steps of reeling, welding, drawing and so on. The bell mouth part is also blanked with a thin copper plate, and then made into a bell mouth, and then welded with the body part to form the overall shape. The disadvantage of the above process is that blisters and unevenness will appear on the surface of the pipe body due to welding. This production method not only makes the appearance of the wind instrument have weld seams and affects the appearance, but also affects the internal quality (sound quality, intonation, timbre). Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/16B21D22/20
Inventor 李玉卯史占秋王中川
Owner 史占秋
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