GB2067110A - Cooling dies of forging machines - Google Patents

Cooling dies of forging machines Download PDF

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Publication number
GB2067110A
GB2067110A GB8001231A GB8001231A GB2067110A GB 2067110 A GB2067110 A GB 2067110A GB 8001231 A GB8001231 A GB 8001231A GB 8001231 A GB8001231 A GB 8001231A GB 2067110 A GB2067110 A GB 2067110A
Authority
GB
United Kingdom
Prior art keywords
die
bolster
duct
cooling fluid
forging
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.)
Granted
Application number
GB8001231A
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GB2067110B (en
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.)
Mclaren A M
Original Assignee
Mclaren A M
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 Mclaren A M filed Critical Mclaren A M
Priority to GB8001231A priority Critical patent/GB2067110B/en
Publication of GB2067110A publication Critical patent/GB2067110A/en
Application granted granted Critical
Publication of GB2067110B publication Critical patent/GB2067110B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K29/00—Arrangements for heating or cooling during processing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

A forging machine of the kind for use in the production of bolts or rivets has a die into which heated billets are successively located and are upset by a punch or heading tool to form a head on the billet. The die is located in a holder or bolster 2 and includes a duct for cooling fluid having an inlet 6 and an outlet 7. The duct is preferably defined by the peripheral wall of the die and a helical groove 4 in the interior face of the bolster. <IMAGE>

Description

SPECIFICATION Improvements relating to forging machines This invention relates to forging machines of the kind for use in the production of bolts or rivets, and having a die into which heated billets are successively located and are upset by a punch or heading tool of the machine to form a head on the billet. The or each die is located in a holder or so-called bolster, and is a tight fit therein.
A forging machine as above described will be referred to hereinafter as a forging machine of the kind aforesaid.
In such forging machines, the or each die is manufactured from hot work steel and is hardened and tempered to 48/50 HRC, and the billets are heated by induction to high temperatures.
After a relatively short period of time, the dies in such forging machines become overheated, and critical edges of the dies become annealed, so that the dies quickly wear-out and produce unacceptable mal-formed upset billets.
An object of the present invention is to provide, in a forging machine of the kind aforesaid, means whereby the life of the or each die may be considerably prolonged.
According to the present invention there is provided a forging machine of the kind aforesaid, in which there is provided, between the or each billet and die, a duct for cooling fluid, the duct extending around the die and substantially from end-to-end thereof, and having at one end an inlet for cooling fluid, and a cooling fluid outlet at its other end.
Preferably, the duct is defined by the peripheral wall of the die and a helical groove in the interior face of the bolster.
Further, according to the present invention there is provided for use in a forging machine of the kind aforesaid, a bolster having on its internal face a helical groove extending between an inlet and an outlet for cooling fluid.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawing, in which: Figure 1 is a plan view of a bolster for a forging machine of the kind aforesaid, and Figure 2 is a sectional view on the line ll-li of Fig. 1.
Referring to the drawing a bolster 1 for a forging machine of the kind aforesaid consists of a body 2 of partly cylindrical and partly frustoconical shape, as shown in Fig. 2. The body 2 has a through aperture 3 of circular cross-sectional area.
In use, the bolster 1 fits into an aperture in the forging machine, and a die having a cavity for a cylindrical billet and the formation of a head on the billet fits tightly into the aperture 3, the aperture 3, the die, and the billet being coaxial with a punch or heading tool of the machine.
The foreging machine so far described is well known and has the disadvantage abovementioned that the die quickly becomes overheated during forging operations.
Bn accordance with the present invention means is provided for preventing or greatly reducing the possibility of the die over-heating as will now be described.
The bolster 1 is provided on the internal face of its aperture 3 with a groove 4 which extends helically around the aperture 3 and substantially from top to bottom of the die when the latter is fitted. When the die is fitted into the aperture 3, the outer peripheral wall of the die closes the convolutions of the helical groove 4 50 that a helical duct is formed between the die and the bolster. At its upper end, the helical groove or duct is connected to the upper end of a vertical bore 5 in the body 2, and the lower end of the bore 5 is connected to a port 6 forming an inlet for connection to a source of cooling fluid, not shown. The lower end of the groove 4 or the helical duct connects with an outlet port 7 for the cooling fluid.
Above and below the helical groove 4, annular grooves 8 and 9 respectively are provided in the interior face of the aperture 3 for fluid seals in the form of O-rings.
The cooling fluid, which may be water, may be supplied from and be returned to a tank which is kept at the desired cooling temperature in any convenient manner, as by heat exchange.
As a result of the invention, the possibility of the or each die in a forging machine becoming undesirably over-heated is prevented or greatly reduced, so that the life of the or each die is considerably extended beyond the life of dies in presently known forging machines of the kind aforesaid.
It is possible for the groove to be formed in the external wa,l of the die instead of in the bolster, or for the duct to be defined by cooperating opposed grooves in the die and in the bolster. it is also possible for the duct to be formed by a pise extending helically between the die and the bolster, and to be located in a groove in the bolster, in the die, or in co-operating grooves in the die and the bolster.
Modifications may be made without departing from the scope of the invention.
1. A forging machine of the kind aforesaid, in which there is provided, between the or each billet and die, a duct for cooling fluid, the duct extending around the die and substantially from end-to-end thereof, and having at one end an inlet for cooling fluid, and a cooling fluid outlet at its other end.
2. A forging machine as claimed in claim
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements relating to forging machines This invention relates to forging machines of the kind for use in the production of bolts or rivets, and having a die into which heated billets are successively located and are upset by a punch or heading tool of the machine to form a head on the billet. The or each die is located in a holder or so-called bolster, and is a tight fit therein. A forging machine as above described will be referred to hereinafter as a forging machine of the kind aforesaid. In such forging machines, the or each die is manufactured from hot work steel and is hardened and tempered to 48/50 HRC, and the billets are heated by induction to high temperatures. After a relatively short period of time, the dies in such forging machines become overheated, and critical edges of the dies become annealed, so that the dies quickly wear-out and produce unacceptable mal-formed upset billets. An object of the present invention is to provide, in a forging machine of the kind aforesaid, means whereby the life of the or each die may be considerably prolonged. According to the present invention there is provided a forging machine of the kind aforesaid, in which there is provided, between the or each billet and die, a duct for cooling fluid, the duct extending around the die and substantially from end-to-end thereof, and having at one end an inlet for cooling fluid, and a cooling fluid outlet at its other end. Preferably, the duct is defined by the peripheral wall of the die and a helical groove in the interior face of the bolster. Further, according to the present invention there is provided for use in a forging machine of the kind aforesaid, a bolster having on its internal face a helical groove extending between an inlet and an outlet for cooling fluid. An embodiment of the invention will now be described, by way of example, with reference to the accompanying diagrammatic drawing, in which: Figure 1 is a plan view of a bolster for a forging machine of the kind aforesaid, and Figure 2 is a sectional view on the line ll-li of Fig. 1. Referring to the drawing a bolster 1 for a forging machine of the kind aforesaid consists of a body 2 of partly cylindrical and partly frustoconical shape, as shown in Fig. 2. The body 2 has a through aperture 3 of circular cross-sectional area. In use, the bolster 1 fits into an aperture in the forging machine, and a die having a cavity for a cylindrical billet and the formation of a head on the billet fits tightly into the aperture 3, the aperture 3, the die, and the billet being coaxial with a punch or heading tool of the machine. The foreging machine so far described is well known and has the disadvantage abovementioned that the die quickly becomes overheated during forging operations. Bn accordance with the present invention means is provided for preventing or greatly reducing the possibility of the die over-heating as will now be described. The bolster 1 is provided on the internal face of its aperture 3 with a groove 4 which extends helically around the aperture 3 and substantially from top to bottom of the die when the latter is fitted. When the die is fitted into the aperture 3, the outer peripheral wall of the die closes the convolutions of the helical groove 4 50 that a helical duct is formed between the die and the bolster. At its upper end, the helical groove or duct is connected to the upper end of a vertical bore 5 in the body 2, and the lower end of the bore 5 is connected to a port 6 forming an inlet for connection to a source of cooling fluid, not shown. The lower end of the groove 4 or the helical duct connects with an outlet port 7 for the cooling fluid. Above and below the helical groove 4, annular grooves 8 and 9 respectively are provided in the interior face of the aperture 3 for fluid seals in the form of O-rings. The cooling fluid, which may be water, may be supplied from and be returned to a tank which is kept at the desired cooling temperature in any convenient manner, as by heat exchange. As a result of the invention, the possibility of the or each die in a forging machine becoming undesirably over-heated is prevented or greatly reduced, so that the life of the or each die is considerably extended beyond the life of dies in presently known forging machines of the kind aforesaid. It is possible for the groove to be formed in the external wa,l of the die instead of in the bolster, or for the duct to be defined by cooperating opposed grooves in the die and in the bolster. it is also possible for the duct to be formed by a pise extending helically between the die and the bolster, and to be located in a groove in the bolster, in the die, or in co-operating grooves in the die and the bolster. Modifications may be made without departing from the scope of the invention. CLAIMS
1. A forging machine of the kind aforesaid, in which there is provided, between the or each billet and die, a duct for cooling fluid, the duct extending around the die and substantially from end-to-end thereof, and having at one end an inlet for cooling fluid, and a cooling fluid outlet at its other end.
2. A forging machine as claimed in claim 1, in which the duct is defined by the peripheral wall of the die and a helical groove in the interior face of the bolster.
3. For use in a forging machine of the kind aforesaid, a bolster having on its internal face a helical groove extending between an inlet and an outlet for cooling fluid.
4. A forging machine of the kind aforesaid and having a bolster substantially as hereinbefore described with reference to the accompanying drawing.
GB8001231A 1980-01-11 1980-01-11 Cooling dies of forging machines Expired GB2067110B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8001231A GB2067110B (en) 1980-01-11 1980-01-11 Cooling dies of forging machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8001231A GB2067110B (en) 1980-01-11 1980-01-11 Cooling dies of forging machines

Publications (2)

Publication Number Publication Date
GB2067110A true GB2067110A (en) 1981-07-22
GB2067110B GB2067110B (en) 1983-05-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110666087A (en) * 2019-10-22 2020-01-10 海盐天奇标准件股份有限公司 Cold header

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110666087A (en) * 2019-10-22 2020-01-10 海盐天奇标准件股份有限公司 Cold header

Also Published As

Publication number Publication date
GB2067110B (en) 1983-05-11

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee