JPS5456409A - Production of agraff for piano - Google Patents
Production of agraff for pianoInfo
- Publication number
- JPS5456409A JPS5456409A JP12282777A JP12282777A JPS5456409A JP S5456409 A JPS5456409 A JP S5456409A JP 12282777 A JP12282777 A JP 12282777A JP 12282777 A JP12282777 A JP 12282777A JP S5456409 A JPS5456409 A JP S5456409A
- Authority
- JP
- Japan
- Prior art keywords
- agraff
- hole
- string
- support part
- string support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 4
- 238000005242 forging Methods 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 238000000034 method Methods 0.000 abstract 1
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
Abstract
PURPOSE: To achieve the increase in mechanical strength and the improvement in productivity by integrally forging seat part and string support part with dies from soft iron material or the like having high malleability and forming a string through- hole in the string support part.
CONSTITUTION: One end part of a highly malleable round bar 30 such as soft iron material or the like having a specified outside diameter and length is inserted into the hole 32 of a lower die 31 for header and an upper die 32 is pressed in the axial direction to plastic-work a seat part 21, string support part 23 and thread part 25 to a certain extent by forging. Next, it is plastic-worked by a lower die 36 for header having the hole 35 of the final shape and an upper die 38 having a recess 37, whereby an agraff 20 of the required shape is obtained. After thread 24 is formed by a rolling method on the peripheral face of the thread part 25 of the agraff having been removed from the dies, a string through-hole 22 is formed in the required position of the string support part 23 by ordinary piercing or the like and chamfering of the opening part thereof is performed. Thereby, the mexhanical strength of the agraff may be increased and productivity improved
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12282777A JPS5456409A (en) | 1977-10-13 | 1977-10-13 | Production of agraff for piano |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12282777A JPS5456409A (en) | 1977-10-13 | 1977-10-13 | Production of agraff for piano |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5456409A true JPS5456409A (en) | 1979-05-07 |
Family
ID=14845610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12282777A Pending JPS5456409A (en) | 1977-10-13 | 1977-10-13 | Production of agraff for piano |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5456409A (en) |
-
1977
- 1977-10-13 JP JP12282777A patent/JPS5456409A/en active Pending
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