GB1569016A – Production of metal hexagonal bars
– Google Patents
GB1569016A – Production of metal hexagonal bars
– Google Patents
Production of metal hexagonal bars
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Info
Publication number
GB1569016A
GB1569016A
GB47630/77A
GB4763077A
GB1569016A
GB 1569016 A
GB1569016 A
GB 1569016A
GB 47630/77 A
GB47630/77 A
GB 47630/77A
GB 4763077 A
GB4763077 A
GB 4763077A
GB 1569016 A
GB1569016 A
GB 1569016A
Authority
GB
United Kingdom
Prior art keywords
die
angle
zone
bar
section
Prior art date
1976-12-01
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.)
Expired
Application number
GB47630/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZAKLADY HUTNICZOPRZETWORCZE ME
Original Assignee
ZAKLADY HUTNICZOPRZETWORCZE ME
Priority date (The priority date 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 date listed.)
1976-12-01
Filing date
1977-11-16
Publication date
1980-06-11
1977-11-16
Application filed by ZAKLADY HUTNICZOPRZETWORCZE ME
filed
Critical
ZAKLADY HUTNICZOPRZETWORCZE ME
1980-06-11
Publication of GB1569016A
publication
Critical
patent/GB1569016A/en
Status
Expired
legal-status
Critical
Current
Links
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Global Dossier
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Classifications
B—PERFORMING OPERATIONS; TRANSPORTING
B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
B21C3/02—Dies; Selection of material therefor; Cleaning thereof
B21C3/04—Dies; Selection of material therefor; Cleaning thereof with non-adjustable section
Description
(54) PRODUCTION OF METAL HEXAGONAL BARS
(71) We, ZAKLADY HUTNICZO
PRZETWORCZE METALI NIEZELAZ
NYCH «HUTMEN», of 50-950 Wroclaw,
Grabiszynska 241, Poland, an Enterprise organised and existing under the laws of
Poland do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to the production of metal hexagonal bars.
In accordance with the known methods, a hexagonal bar is obtained by hot extrustion or rolling usually followed by drawing operation to obtain a bar having suitable mechanical properties and required shape and dimensions. The hot extrusion process is used in the case of non-ferrous metals, particularly copper, copper alloys, aluminium and aluminium alloys, while hot rolling is used for ferrous alloys.
A hexagonal copper or copper alloy bar obtained by hot extrusion is prepared, for subsequent drawing operation by providing a point at one of its ends and by pickling it.
Extruded bars thus prepared are drawn in drawbenches, in drum-type drawing machines or in draw-straightening-cutter machines, and are then heated, straightened and cut at their ends. The drawing operation is performed by means of a drawing die whose forming walls in the entry section and in the deformation and sizing sections are flat. The dies used for hot extrusion in production of hexagonal bars are damageable due to high stresses occurring in the die corners. The extruded hexagonal bars are vulnerable to scars forming on their edges at the exit from the press and in transport.
In extrusion processes used in production of hexagonal bars the rectilinearity of side faces is not ensured over the whole length of the extruded bars. In drawing these bars the deformation of their edges takes place from guide rolls in a drawbench and the faces of the hexagon become additionally twisted.
The object of this invention is to obviate or mitigate the above drawbacks.
In accordance with one aspect of this invention, there is provided a drawing die for production of metal hexagonal bars, said drawing die having an entry zone, a deformation section, and a sizing section, each of the six side faces in the deformation section being straight longitudinally and convexly curbed transversely with the convexity diminishing from the entry zone to the sizing section, the angle between opposite side faces being within the range of 8″ to 32″, the angle between opposite edges being greater than the first mentioned angle and the tangent of the second-mentioned angle being greater than the product of the tangent of the first-mentioned angle and a factor 1.17.
In accordance with another aspect of this invention, there is provided a method for production of metal hexagonal bars, wherein a drawing die, as defined in the next preceding paragraph, is used to subject extruded material, which is round in cross-section, to a single drawing operation to yield a hexagonal bar, the diameter of the round bar introduced into the drawing die being minimally 1.09 of the dimension across flats of the finished hexagon.
The drawing operation can be effected in a drawbench, a drum-type drawing machine or in a draw-straightening-cutter machine.
Drawing of a round bar into a hexagonal bar eliminates the imperfections of the conventional process, improves the life of extruding dies because round dies are used, and improves the output, improving namely the weight ratio of finished bars to bars used in production.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 illustrates the die in plan;
Fig. 2 illustrates the die in a section along the line A-A shown in Fig. 1;
Fig. 3 illustrates the die in a section along the line B-B shown in Fig. 1;
Fig. 4 illustrates the die in plan with the bar to be drawn inserted into the die; and
Fig. 5 illustrates the die in a section along the C-C line shown in Fig. 4, showing the deformation zones of the die.
A round bar of diameter d is subjected to a drawing operation to obtain a hexagonal bar of «across flats» (A.F.) dimension s upon condition that the diameter d of the bar introduced to the die is minimally 1.09 of the dimensions of the hexagon, while for a hexagon with sharp edges in copper or copper alloy the diameter d is 1.15 to 1.5 of the dimensions of the hexagon. A round bar 1 of diameter d is drawn by means of a die 2, said die having a deformation section 3 and a sizing section 4. In the deformation section 3 of the die two forming zones of the hexagon can be distinguished. these zones being designated as zone I and zone II. In zone II the edges and side faces of the hexagon are formed. and in zone I only the side faces of this hexagon are formed.In the zone I the material of the drawn bar of diameter d is elongated and forced towards the corners of the die. the contact of the drawn material with six corners of the die taking place at the beginning of zone II. The finished hexagonal form of the drawn bar is obtained in the end part of zone II. Dimensional tolerance of the cross section of the bar and its rectilinearity are stabilised in the sizing zone III of the die.
Each of the six side faces of the deformation section 3 of the die, e.g. EFGH, is a surface of diminishing convexity along a centre line 5, this diminishing convexity being determined by points Rand T. The geometry of the drawing die is also determined by an angle 2 a confined between extensions of generating lines x-y and x’-y’. as well as by an angle 2a1 confined between the extensions of edges
M-N and M’-N’.The angle 2axis greater than the angle 2a bv a value resulting from the dependence in which the tangent of angle a1 1 is greater than the product of the tangent of angle a and the factor 1.17, the difference between these two angles being preferably 3 to 18″. The value of angle 2a depends on the type of drawn material and is confined within the range of 8″ to 32″. The length of the sizing zone is designated as a dimension c whose accepted minimum value is 0.3s, s being the A.F. dimension of the hexagon.
WHAT WE CLAIM IS:
1. A drawing die for production of metal hexagonal bars, said drawing die having an entry zone, a deformation section, and a sizing section, each of the six side faces in the deformation section being straight longitudinally and convexly curved transversely with the convexity diminishing from the entry zone to the sizing section, the angle between opposite side faces being within the range of 8″ to 32″, the angle between opposite edges being greater than the first-mentioned angle and the tangent of the second-mentioned angle being greater than the product of the tangent of the first-mentioned angle and a factor 1.17.
2. A drawing die according to claim 1, wherein the difference between the two angles is within the range of 3 to 18″.
3. A drawing die for production of metal hexagonal bars, substantially as hereinbefore described with reference to the accompanying drawings.
4. A method for production of metal hexagonal bars, wherein a drawing die according to any one of claims 1 to 3 is used to subject extruded material, which is round in cross-section, to a single drawing operation to yield a hexagonal bar, the minimum diameter of the round bar introduced into the drawing die being 1.09 of the dimension across flats of the finished hexagon.
5. A method according to claim 4, wherein, with copper or copper alloy bars, the diameter of the round bar is 1.15 to 1.5 of the A.F. dimension of the finished hexagonal bar. – –
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (5)
**WARNING** start of CLMS field may overlap end of DESC **. Fig. 1 illustrates the die in plan; Fig. 2 illustrates the die in a section along the line A-A shown in Fig. 1; Fig. 3 illustrates the die in a section along the line B-B shown in Fig. 1; Fig. 4 illustrates the die in plan with the bar to be drawn inserted into the die; and Fig. 5 illustrates the die in a section along the C-C line shown in Fig. 4, showing the deformation zones of the die. A round bar of diameter d is subjected to a drawing operation to obtain a hexagonal bar of «across flats» (A.F.) dimension s upon condition that the diameter d of the bar introduced to the die is minimally 1.09 of the dimensions of the hexagon, while for a hexagon with sharp edges in copper or copper alloy the diameter d is 1.15 to 1.5 of the dimensions of the hexagon. A round bar 1 of diameter d is drawn by means of a die 2, said die having a deformation section 3 and a sizing section 4. In the deformation section 3 of the die two forming zones of the hexagon can be distinguished. these zones being designated as zone I and zone II. In zone II the edges and side faces of the hexagon are formed. and in zone I only the side faces of this hexagon are formed.In the zone I the material of the drawn bar of diameter d is elongated and forced towards the corners of the die. the contact of the drawn material with six corners of the die taking place at the beginning of zone II. The finished hexagonal form of the drawn bar is obtained in the end part of zone II. Dimensional tolerance of the cross section of the bar and its rectilinearity are stabilised in the sizing zone III of the die. Each of the six side faces of the deformation section 3 of the die, e.g. EFGH, is a surface of diminishing convexity along a centre line 5, this diminishing convexity being determined by points Rand T. The geometry of the drawing die is also determined by an angle 2 a confined between extensions of generating lines x-y and x’-y’. as well as by an angle 2a1 confined between the extensions of edges M-N and M’-N’.The angle 2axis greater than the angle 2a bv a value resulting from the dependence in which the tangent of angle a1 1 is greater than the product of the tangent of angle a and the factor 1.17, the difference between these two angles being preferably 3 to 18″. The value of angle 2a depends on the type of drawn material and is confined within the range of 8″ to 32″. The length of the sizing zone is designated as a dimension c whose accepted minimum value is 0.3s, s being the A.F. dimension of the hexagon. WHAT WE CLAIM IS:
1. A drawing die for production of metal hexagonal bars, said drawing die having an entry zone, a deformation section, and a sizing section, each of the six side faces in the deformation section being straight longitudinally and convexly curved transversely with the convexity diminishing from the entry zone to the sizing section, the angle between opposite side faces being within the range of 8″ to 32″, the angle between opposite edges being greater than the first-mentioned angle and the tangent of the second-mentioned angle being greater than the product of the tangent of the first-mentioned angle and a factor 1.17.
2. A drawing die according to claim 1, wherein the difference between the two angles is within the range of 3 to 18″.
3. A drawing die for production of metal hexagonal bars, substantially as hereinbefore described with reference to the accompanying drawings.
4. A method for production of metal hexagonal bars, wherein a drawing die according to any one of claims 1 to 3 is used to subject extruded material, which is round in cross-section, to a single drawing operation to yield a hexagonal bar, the minimum diameter of the round bar introduced into the drawing die being 1.09 of the dimension across flats of the finished hexagon.
5. A method according to claim 4, wherein, with copper or copper alloy bars, the diameter of the round bar is 1.15 to 1.5 of the A.F. dimension of the finished hexagonal bar. – –
GB47630/77A
1976-12-01
1977-11-16
Production of metal hexagonal bars
Expired
GB1569016A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
PL1976194094A
PL110940B1
(en)
1976-12-01
1976-12-01
Method of manufacturing rods of hexagonal cross-sectionand drawing die for manufacturing rods of hexagonal cross-section
Publications (1)
Publication Number
Publication Date
GB1569016A
true
GB1569016A
(en)
1980-06-11
Family
ID=19979631
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB47630/77A
Expired
GB1569016A
(en)
1976-12-01
1977-11-16
Production of metal hexagonal bars
Country Status (6)
Country
Link
DD
(1)
DD133533A5
(en)
DE
(1)
DE2753001A1
(en)
FR
(1)
FR2372662A1
(en)
GB
(1)
GB1569016A
(en)
PL
(1)
PL110940B1
(en)
SE
(1)
SE7713564L
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2004018123A1
(en)
*
2002-08-22
2004-03-04
Jordan Chalmer C
Improved tool for removing damaged fasteners and securing new fasteners and improved method for making such tool
CN113909320A
(en)
*
2021-09-08
2022-01-11
宁波金田铜业(集团)股份有限公司
Drawing die for hexagonal copper alloy bar wire
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
HU204312B
(en)
*
1985-11-26
1991-12-30
December 4 Drotmuevek
Stretching staple for stressed concrete structures
1976
1976-12-01
PL
PL1976194094A
patent/PL110940B1/en
unknown
1977
1977-11-15
FR
FR7734292A
patent/FR2372662A1/en
not_active
Withdrawn
1977-11-16
GB
GB47630/77A
patent/GB1569016A/en
not_active
Expired
1977-11-28
DE
DE19772753001
patent/DE2753001A1/en
not_active
Withdrawn
1977-11-29
DD
DD7700202305A
patent/DD133533A5/en
unknown
1977-11-30
SE
SE7713564A
patent/SE7713564L/en
unknown
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO2004018123A1
(en)
*
2002-08-22
2004-03-04
Jordan Chalmer C
Improved tool for removing damaged fasteners and securing new fasteners and improved method for making such tool
CN113909320A
(en)
*
2021-09-08
2022-01-11
宁波金田铜业(集团)股份有限公司
Drawing die for hexagonal copper alloy bar wire
Also Published As
Publication number
Publication date
DE2753001A1
(en)
1978-06-08
DD133533A5
(en)
1979-01-10
SE7713564L
(en)
1978-06-02
PL194094A1
(en)
1978-06-05
PL110940B1
(en)
1980-08-30
FR2372662A1
(en)
1978-06-30
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Legal Events
Date
Code
Title
Description
1980-10-08
PS
Patent sealed
1982-06-23
PCNP
Patent ceased through non-payment of renewal fee
