EP0034139A1 - Marteau coulé pour une machine à forger - Google Patents

Marteau coulé pour une machine à forger Download PDF

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Publication number
EP0034139A1
EP0034139A1 EP81890012A EP81890012A EP0034139A1 EP 0034139 A1 EP0034139 A1 EP 0034139A1 EP 81890012 A EP81890012 A EP 81890012A EP 81890012 A EP81890012 A EP 81890012A EP 0034139 A1 EP0034139 A1 EP 0034139A1
Authority
EP
European Patent Office
Prior art keywords
hammer
forging
base
recess
base plate
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
EP81890012A
Other languages
German (de)
English (en)
Other versions
EP0034139B1 (fr
Inventor
Bernd Dipl.-Ing. Kos
Wilfried Dr. Meyer
Rupert Strobl
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke AG
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 Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0034139A1 publication Critical patent/EP0034139A1/fr
Application granted granted Critical
Publication of EP0034139B1 publication Critical patent/EP0034139B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B21J13/06—Hammers tups; Anvils; Anvil blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02—Special design or construction
    • B21J7/14—Forging machines working with several hammers

Definitions

  • the invention relates to a cast hammer for forging machines with an improved service life.
  • the hammers of forging machines are exposed to very high mechanical and thermal stresses.
  • long-forging machines for example, the pieces to be forged, heated to over 800 ° C., are fastened in a transport device, which then moves the elongated forging through the actual forging machine, in which, for example, four hammers that can be moved relative to one another and that deform the forging are arranged.
  • a rotary movement can also be carried out, so that not only approximately square pieces but also round forgings can be obtained.
  • the forging hammers have a base plate which can be connected to that of the forged connecting rod.
  • the base plate of the forging hammer is not subject to excessive mechanical stress, since it is only used to transmit forces from the hammer to the forged connecting rod and a relatively large area is provided for it. Furthermore, the thermal stress is only slight, since even with long-term processing, temperatures that are significantly above 300 ° C. are not reached.
  • the load on the work surface arranged opposite the base surface of the base plate is different.
  • the work surface generally has different sections, which differ in the course of the forging process Have tasks to perform. So a forging hammer, u. seen in the axial direction of the forging, have different areas. Those areas of the work surface that are not arranged parallel to the base surface serve to displace the material to be forged and, since the greatest forces act here, are subject to particularly heavy loads.
  • the area of the working - area which is arranged approximately parallel to the base surface, has the function that the already deformed material is changed in its surface quality and Although smoothed. This so-called smoothing surface is therefore not exposed to as much stress as the rest of the working surface.
  • the temperature of the work surface can reach over 800 0 C; considering that the temperature of the base surface is only about 300 ° C, it is understandable that the slightest defect in the forging hammer can already lead to a considerable reduction in the life of the same. From the material side, only a very few alloys are suitable at all to meet such large stresses, and it has been shown that nickel-based alloys with approximately 20% chromium are particularly suitable.
  • the hammers receive so-called fire cracks, which are due to the high mechanical stress at high temperatures. These fire cracks must be avoided to prevent the hammer from being destroyed, e.g. be removed by grinding in order to avoid a notch effect, and after such cracks have been ground out, a build-up welding can be carried out to level the work surface.
  • Such hammers have a weight which no longer allows manipulation to be carried out without mechanical aids.
  • For this manipulation eg for inserting the hammers into the forging machine; bores are provided in the base plate, which are not exposed to any significant mechanical stress.
  • the aim of the present invention is to design known forging hammers, in particular for long forging machines, in such a way that a longer service life can be achieved.
  • the cast hammer according to the invention for forging machines in particular long forging machines, with a base plate with a base surface which, when mounted on the forged connecting rod, bears against its base surface and a working surface which is arranged opposite the base surface and has a smoothing surface which is approximately parallel to the base surface, consists essentially of it that at least one rounded recess is provided between the base plate and the work surface, which passes through the symmetry plane of the hammer, which runs approximately normal to the base plate, or is arranged symmetrically to it.
  • This recess or recesses reduces the cross-section of the forging hammer in those areas which are subject to particularly high mechanical and thermal stress.
  • At least one recess opens into the base surface, a uniform reduction in cross-section can be avoided, the recess as such being able to be arranged in the area where the forces are only minor.
  • the recesses are or are arranged parallel to the base surface, a particularly good compensation of the tensions during operation can be achieved, so that the fire cracks, which run normal to the work surface, grow more slowly and an increase in the service life can also be achieved. It is particularly advantageous to arrange the recesses) with the proviso that there is an approximately uniform material thickness with respect to the outer wall or to the (s) adjacent recess (es), which means that the mechanical and thermal stresses are particularly favorable is reached.
  • the effect according to the invention of increasing the service life is achieved particularly favorably by the volume of the recess being at least 3%, preferably 5-15%, of that of the hammer.
  • the forging hammer shown in FIG. 1 has a base plate 1 provided with handling bores 3, the thickness of which is determined by the extensions 2, which are used to mount the forging hammer on the forged connecting rod, not shown.
  • the base surface 4, which also extends over the extensions 2, is arranged opposite the work surface, which has a region 5 which is arranged inclined to the base surface 4 and a smoothing surface 6 which is arranged parallel to the base surface.
  • a cylindrical recess 7 is provided between the base plate 1 and the work surface 5, 6, which extends over the entire length of the hammer and through whose axis the plane of symmetry of the hammer, which runs normal to the base plate, passes.
  • FIG. 2 shows an embodiment of a hammer as it has proven particularly useful in the practice.
  • the hammer has two recesses 8 above the base plate 1 on, so that a web 9 is formed.
  • the working surface extends from the web 9 over the smoothing surface 6 to the area 5.
  • two cylindrical recesses 10 are provided extend normal to the plane of symmetry and enforce it.
  • the cylindrical recesses open into the respective side surfaces 11.
  • the total height of the forging hammer is approximately 230 mm
  • the height of the base plate is 80 mm
  • the diameter of the two bores is 60 mm
  • the weight saving is approximately 7%.
  • FIG. 3 shows a particularly simple embodiment of a forging hammer, two base-shaped recesses 12 extending from the base surface 4, which extend normal to the smoothing surface and the total volume of which is approximately 12%.
  • the thickness of the base plate is also determined here by the extensions 2, so that it is thicker than that region 13 which has no work surface.
  • the rounded recesses are always arranged near the thermal center of the hammer.
  • the thermal center of the hammer roughly corresponds to the center of gravity of the entire forging hammer.
  • All forging hammers shown in the drawings can also be designed so that the recesses e.g. can be filled again by welding or by welding a bolt. As a result, the weight saving of approx. 10 to 20% is no longer possible, but the mechanical stability can be increased as a result.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP81890012A 1980-02-06 1981-01-23 Marteau coulé pour une machine à forger Expired EP0034139B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT63680A AT365493B (de) 1980-02-06 1980-02-06 Schmiedehammer
AT636/80 1980-02-06

Publications (2)

Publication Number Publication Date
EP0034139A1 true EP0034139A1 (fr) 1981-08-19
EP0034139B1 EP0034139B1 (fr) 1983-09-21

Family

ID=3495827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81890012A Expired EP0034139B1 (fr) 1980-02-06 1981-01-23 Marteau coulé pour une machine à forger

Country Status (3)

Country Link
EP (1) EP0034139B1 (fr)
AT (1) AT365493B (fr)
DE (1) DE3160896D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1066077C (zh) * 1997-04-07 2001-05-23 燕山大学 水平v型锥面砧锻造新工艺
RU2507023C2 (ru) * 2012-02-03 2014-02-20 Общество с ограниченной ответственностью "ОМЗ-Спецсталь" Подвесной боек

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2507024C1 (ru) * 2012-08-10 2014-02-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") Вибробоек

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965100C (de) * 1954-07-25 1957-05-29 Wmf Wuerttemberg Metallwaren Gesenk aus Warmarbeitsstahl zum Herstellen von Metallgegenstaenden

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977420A (en) * 1930-06-02 1934-10-16 Beche Hans Hammer tup
DE608449C (de) * 1933-12-31 1935-01-25 Aeg Pressform oder Gesenk mit scharfen Kanten
DE803144C (de) * 1948-10-02 1951-03-01 Beche & Grohs G M B H Hohlbaer fuer mechanische Haemmer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965100C (de) * 1954-07-25 1957-05-29 Wmf Wuerttemberg Metallwaren Gesenk aus Warmarbeitsstahl zum Herstellen von Metallgegenstaenden

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1066077C (zh) * 1997-04-07 2001-05-23 燕山大学 水平v型锥面砧锻造新工艺
RU2507023C2 (ru) * 2012-02-03 2014-02-20 Общество с ограниченной ответственностью "ОМЗ-Спецсталь" Подвесной боек

Also Published As

Publication number Publication date
EP0034139B1 (fr) 1983-09-21
DE3160896D1 (en) 1983-10-27
AT365493B (de) 1982-01-25
ATA63680A (de) 1981-06-15

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