GB2132125A - Tool for fluid-forming of workpieces - Google Patents

Tool for fluid-forming of workpieces Download PDF

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Publication number
GB2132125A
GB2132125A GB08235611A GB8235611A GB2132125A GB 2132125 A GB2132125 A GB 2132125A GB 08235611 A GB08235611 A GB 08235611A GB 8235611 A GB8235611 A GB 8235611A GB 2132125 A GB2132125 A GB 2132125A
Authority
GB
United Kingdom
Prior art keywords
semi
product
tool
mandrels
mandrel
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.)
Withdrawn
Application number
GB08235611A
Inventor
Jiri Tomasek
Jindrich Spacek
Jiri Kosek
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.)
VITKOVICE ZDARSKE STROJIRNY A
Original Assignee
VITKOVICE ZDARSKE STROJIRNY A
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.)
Filing date
Publication date
Application filed by VITKOVICE ZDARSKE STROJIRNY A filed Critical VITKOVICE ZDARSKE STROJIRNY A
Priority to GB08235611A priority Critical patent/GB2132125A/en
Publication of GB2132125A publication Critical patent/GB2132125A/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/043—Means for controlling the axial pusher
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces
    • B21C37/294—Forming collars by compressing a fluid or a yieldable or resilient mass in the tube

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The present invention relates to a tool for fluid forming of workpieces, which comprises a die (1) and at least two mandrels (3). Upon the forward face of a mandrel is provided a plug (5) which is inserted into the internal space (7) of the semi-product (6), reducing the volume of the working fluid which is required to fill the internal space. Furthermore, the plugs (5) may control the internal diameter of the semi-product (6) during the forming process. The plugs (5) may also prevent the appearance of waves inside the finished workpiece. <IMAGE>

Description

SPECIFICATION Tool for fluid-forming of workpieces The present invention relates to a tool for fluid forming of workpieces.
Hitherto known apparatus for fluid forming of workpieces usually comprises two or more forming mandrels which serve to seal the ends of a hollow generally tubular semiproduct. The ends of mandrels which abut against the semiproduct are usually flat or stepped to facilitate centering of the semiproduct. One or more of the mandrels is conventionally provided with a bore so arranged that the semiproduct may be filled with a working fluid, and the pressure of the working fluid may be controlled during the forming process.
A drawback with the above described apparatus, is that a large quantity of the working fluid is consumed in the forming process. Furthermore, waves, overlaps or other defects may appear in the workpiece.
According to the present invention there is provided a tool for fluid forming of a workpiece from a semi-product, said tool comprising at least two mandrels and a die each mandrel comprising a plug protruding from a face of the mendrel axially of the mandrel, the plug being surrounded by a sealing surface upon said face, the tool being adapted so that, in use, when the sealing surface engages with the end of a generally tubular semi-product, the plug occupies a part of a space within the semi-product.
It is possible by having a plug which occupies a part of the space within the semi-product, the volume of the working fluid within the semi-product may be reduced. In this way, the time for filling the semi-product with a working fluid may also be reduced and the output of the machine may be increased. Furthermore the quantity of working fluid supplied into the semi-product may also be reduced which may make pressure control of the fluid within the semi-product more simple and accurate, as the working fluid may be compressed at high working pressures.
In an embodiment the plug of at least one said mandrel is cylindrical and has a diameter equal to an internal diameter of the workpiece.
In an embodiment the plug of at least one said mandrel is a truncated cone tapering inwardly from a diameter equal to an internal diameter of the workpiece.
The invention will be further described with reference to the accompanying drawings, in which: Figure 1 shows a schematic sketch of the tool for forming T-pipe fittings by a fluid viz. in a position before starting the forming operation; Figures 2 and 3 show the tool of Figure 1 in the position, when the forming process is over.
Turning now to Figure 1, a semi-product 6 is seated between an upper part 1 of a die and a lower part 2 of the die. Mandrels 3 are provided with plugs 5. The diameter of the plugs 5 is less than or equal to the internal diameter of the semi-product 6. The lengths of the plugs 5 are such that the mandrels do not disengage from the semi-product 6, after the forming operation is over. At least one mandrel 3 is provided with a bore 4 for filling, and controlling the pressure of, a working fluid 7 inside the semiproduct 6.
In operation, a semi-product is located between the upper part 1 of the die and the lower part 2 of the die. After the upper part 1 of the die has been pressed down, the mandrels 3 are fed onto the face of the semi-product 6; the plugs 5 of the mandrels 3 occupy a part of the space inside the semi-product. If the whole cavity of the tool is not permanently filled with the working fluid 7, the said fluid is supplied via the bore 4, and the available internal space of the semi-product 6 is filled with the fluid.
The volume of the working fluid 7 in the semiproduct 6, differs from the total volume of the internal space of the semi-product 6 by the volume of the plugs 5 of the mandrels 3. As shown in Figures 2 and 3, a pressing of faces of the semi-product 6 by the mandrels 3 occurs. The pressure of the working fluid 7 inside the semi-product increases, until the formed semi-product 6 starts taking the shape of the cavity of the lower part 2 of the die. The pressure of the working fluid 7 may be controlled via the bore 4.
The length of the plugs 5 of the mandrels 3 may be chosen so that the plugs may meet when the forming operation is completed. The shape of the plugs 5 may be chosen so that it may prevent the appearance of waves inside the finished workpiece, as is shown in Figure 2. Or the shape of the plugs 5 may secure simultaneously a calibration of the inner shape on the ends of the pipe fitting, as is shown in Figure 3.
1. Atool forfluid-forming of a workpiece from a semi-product, said tool comprising at least two mandrels and a die, each mandrel comprising a plug protruding from a face of the mandrel axially of the mandrel, the plug being surrounded by a sealing surface upon said face, the tool being adapted so that, in use, when the sealing surface engages with the end of a generally tubular semi-product, the plug occupies a part of a space within the semi-product.
2. A tool according to claim 1, wherein the plug of at least one sadi mandrel is cylindrical and has a diameter equal to an internal diameter of the workpiece.
3. A tool according to claim 1, wherein the plug of at least one said mandrel is a truncated cone tapering inwardly from a diameter equal to an internal diameter of the workpiece.
4. A tool according to any one of claims 1 to 3, wherein the length of the plug of at least one said mandrel is half the length of the workpiece.
5. A tool according to any one of claims 1 to 4, wherein at least one mandrel is provided with an internal bore, the bore being adapted to communicate with a space within the semi-product and supply a working fluid thereto.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Tool for fluid-forming of workpieces The present invention relates to a tool for fluid forming of workpieces. Hitherto known apparatus for fluid forming of workpieces usually comprises two or more forming mandrels which serve to seal the ends of a hollow generally tubular semiproduct. The ends of mandrels which abut against the semiproduct are usually flat or stepped to facilitate centering of the semiproduct. One or more of the mandrels is conventionally provided with a bore so arranged that the semiproduct may be filled with a working fluid, and the pressure of the working fluid may be controlled during the forming process. A drawback with the above described apparatus, is that a large quantity of the working fluid is consumed in the forming process. Furthermore, waves, overlaps or other defects may appear in the workpiece. According to the present invention there is provided a tool for fluid forming of a workpiece from a semi-product, said tool comprising at least two mandrels and a die each mandrel comprising a plug protruding from a face of the mendrel axially of the mandrel, the plug being surrounded by a sealing surface upon said face, the tool being adapted so that, in use, when the sealing surface engages with the end of a generally tubular semi-product, the plug occupies a part of a space within the semi-product. It is possible by having a plug which occupies a part of the space within the semi-product, the volume of the working fluid within the semi-product may be reduced. In this way, the time for filling the semi-product with a working fluid may also be reduced and the output of the machine may be increased. Furthermore the quantity of working fluid supplied into the semi-product may also be reduced which may make pressure control of the fluid within the semi-product more simple and accurate, as the working fluid may be compressed at high working pressures. In an embodiment the plug of at least one said mandrel is cylindrical and has a diameter equal to an internal diameter of the workpiece. In an embodiment the plug of at least one said mandrel is a truncated cone tapering inwardly from a diameter equal to an internal diameter of the workpiece. The invention will be further described with reference to the accompanying drawings, in which: Figure 1 shows a schematic sketch of the tool for forming T-pipe fittings by a fluid viz. in a position before starting the forming operation; Figures 2 and 3 show the tool of Figure 1 in the position, when the forming process is over. Turning now to Figure 1, a semi-product 6 is seated between an upper part 1 of a die and a lower part 2 of the die. Mandrels 3 are provided with plugs 5. The diameter of the plugs 5 is less than or equal to the internal diameter of the semi-product 6. The lengths of the plugs 5 are such that the mandrels do not disengage from the semi-product 6, after the forming operation is over. At least one mandrel 3 is provided with a bore 4 for filling, and controlling the pressure of, a working fluid 7 inside the semiproduct 6. In operation, a semi-product is located between the upper part 1 of the die and the lower part 2 of the die. After the upper part 1 of the die has been pressed down, the mandrels 3 are fed onto the face of the semi-product 6; the plugs 5 of the mandrels 3 occupy a part of the space inside the semi-product. If the whole cavity of the tool is not permanently filled with the working fluid 7, the said fluid is supplied via the bore 4, and the available internal space of the semi-product 6 is filled with the fluid. The volume of the working fluid 7 in the semiproduct 6, differs from the total volume of the internal space of the semi-product 6 by the volume of the plugs 5 of the mandrels 3. As shown in Figures 2 and 3, a pressing of faces of the semi-product 6 by the mandrels 3 occurs. The pressure of the working fluid 7 inside the semi-product increases, until the formed semi-product 6 starts taking the shape of the cavity of the lower part 2 of the die. The pressure of the working fluid 7 may be controlled via the bore 4. The length of the plugs 5 of the mandrels 3 may be chosen so that the plugs may meet when the forming operation is completed. The shape of the plugs 5 may be chosen so that it may prevent the appearance of waves inside the finished workpiece, as is shown in Figure 2. Or the shape of the plugs 5 may secure simultaneously a calibration of the inner shape on the ends of the pipe fitting, as is shown in Figure 3. CLAIMS
1. Atool forfluid-forming of a workpiece from a semi-product, said tool comprising at least two mandrels and a die, each mandrel comprising a plug protruding from a face of the mandrel axially of the mandrel, the plug being surrounded by a sealing surface upon said face, the tool being adapted so that, in use, when the sealing surface engages with the end of a generally tubular semi-product, the plug occupies a part of a space within the semi-product.
2. A tool according to claim 1, wherein the plug of at least one sadi mandrel is cylindrical and has a diameter equal to an internal diameter of the workpiece.
3. A tool according to claim 1, wherein the plug of at least one said mandrel is a truncated cone tapering inwardly from a diameter equal to an internal diameter of the workpiece.
4. A tool according to any one of claims 1 to 3, wherein the length of the plug of at least one said mandrel is half the length of the workpiece.
5. A tool according to any one of claims 1 to 4, wherein at least one mandrel is provided with an internal bore, the bore being adapted to communicate with a space within the semi-product and supply a working fluid thereto.
6. A tool forfluid-forming of a workpiece substantially as hereinbefore described with reference to the accompanying figures.
GB08235611A 1982-12-14 1982-12-14 Tool for fluid-forming of workpieces Withdrawn GB2132125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08235611A GB2132125A (en) 1982-12-14 1982-12-14 Tool for fluid-forming of workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08235611A GB2132125A (en) 1982-12-14 1982-12-14 Tool for fluid-forming of workpieces

Publications (1)

Publication Number Publication Date
GB2132125A true GB2132125A (en) 1984-07-04

Family

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Family Applications (1)

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GB08235611A Withdrawn GB2132125A (en) 1982-12-14 1982-12-14 Tool for fluid-forming of workpieces

Country Status (1)

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GB (1) GB2132125A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287203A (en) * 1994-03-07 1995-09-13 Mascotech Tubular Prod Inc Process and apparatus for hydroforming a vehicle manifold
WO2011003282A1 (en) * 2009-07-06 2011-01-13 上海昌强电站配件有限公司 Forging backward-extrusion process for making tee-pipe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470485A (en) * 1935-04-02 1937-08-13 Edward Shelton Cornell Jr Method of producing integral metal pipe fittings
GB539167A (en) * 1940-04-12 1941-08-29 W S A Inc Improvements in or relating to the manufacture of hollow articles
GB701547A (en) * 1951-08-22 1953-12-30 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB701536A (en) * 1951-06-08 1953-12-30 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB702232A (en) * 1951-08-01 1954-01-13 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB2057322A (en) * 1979-08-28 1981-04-01 Mannesmann Ag Process and apparatus for the formation of hollow objects having varying cross section

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB470485A (en) * 1935-04-02 1937-08-13 Edward Shelton Cornell Jr Method of producing integral metal pipe fittings
GB539167A (en) * 1940-04-12 1941-08-29 W S A Inc Improvements in or relating to the manufacture of hollow articles
GB701536A (en) * 1951-06-08 1953-12-30 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB702232A (en) * 1951-08-01 1954-01-13 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB701547A (en) * 1951-08-22 1953-12-30 Ici Ltd Improvements in or relating to methods and apparatus for making branched pipe fittings
GB2057322A (en) * 1979-08-28 1981-04-01 Mannesmann Ag Process and apparatus for the formation of hollow objects having varying cross section

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287203A (en) * 1994-03-07 1995-09-13 Mascotech Tubular Prod Inc Process and apparatus for hydroforming a vehicle manifold
GB2287203B (en) * 1994-03-07 1997-01-08 Mascotech Tubular Prod Inc Process and apparatus for hydroforming a vehicle manifold
WO2011003282A1 (en) * 2009-07-06 2011-01-13 上海昌强电站配件有限公司 Forging backward-extrusion process for making tee-pipe

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)