US3512738A - Prestressing of support members for slide benches of large machine tools - Google Patents

Prestressing of support members for slide benches of large machine tools Download PDF

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Publication number
US3512738A
US3512738A US706334A US3512738DA US3512738A US 3512738 A US3512738 A US 3512738A US 706334 A US706334 A US 706334A US 3512738D A US3512738D A US 3512738DA US 3512738 A US3512738 A US 3512738A
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United States
Prior art keywords
rods
tie
bench
slide
web
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.)
Expired - Lifetime
Application number
US706334A
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English (en)
Inventor
Maso Galbarini
Francesco Cotta Ramusino
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Innocenti Societa General per lIndustria Metallurgica e Meccanica
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Innocenti Societa General per lIndustria Metallurgica e Meccanica
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/0054—Means for adjusting the position of a machine tool with respect to its supporting surface

Definitions

  • the invention relates to preloading of support members for slide benches of large machine tools.
  • slide benches of large machine tools usually rest on underlying foundations through support members which transmit loads to the foundations.
  • the support members should be preloaded. It is well known that if the variation in load on the support member takes place from an initially low value near zero, the member is deformed by a much greater extent than if a similar variation were to take place starting from a high initial load.
  • Preload of the support members should be effected when the members are assembled in their final position either before or after final adjustment thereof.
  • Preloading of support members arranged at the sides of the bench may be effected easily by means of straps and screw-threaded tie-rods embedded in the foundation and arranged externally of the jack, or by means of tierods coaxial with the support members.
  • An object of the present invention is to obviate the above drawbacks by providing means for simply and quickly preloading central support members for the benches of machine tools, without deforming the bench, boring guideways on the bench, or interrupting the continuity of vertical supporting webs.
  • the main characteristic feature of the prestressing means according to the invention is that the said means comprise, in combination with a central support member to which vertical loads are transmitted directly through a vertical web, two tie-rods embedded in and extend "Ice ing vertically upwardly from an underlying foundation, said tie-rods being disposed symmetrically on opposite sides of the web and the upper ends of the tie-rods engaging respective cross arms extending outwardly with respect to opposite sides of the web and arranged to exert a downwardly directed preload centrally on the bench support member in response to pre-tensioning of the tie-rods.
  • respective nuts are screw-threaded on the upper ends of the tie-rods, and pretensioning of the latter is effected by screwing down of the respective nuts to exert a downward force on the respective cross arm.
  • FIG. 1 is a vertical cross sectional view of a slide bench of a large machine tool, provided with means for preloading a central support member according to one embodiment of the invention
  • FIG. 2 is across sectional view similar to that of FIG. 1 showing another embodiment of the invention
  • FIG. 3 is a longitudinal horizontal sectional view on line III-III of FIG. 2;
  • FIG. 4 is a partly broken-away perspective view of the embodiment shown in FIGS. 2 and 3.
  • reference numerals 1, 1 denote upper and lower horizontal plates respectively of a slide bench for a large-sized machine tool.
  • the upper plate 1 carries a plurality of parallel guideways 2, one only of which is shown, and is connected with the lower plate 1' by a vertical web 3 extending longitudinally beneath the centre-line of the guideway 2, and by transversely extending vertical cross webs 3. Pairs of gussets 7 interconnect opposite faces of the Web 3 with the upper plate 1 to stiffen the web 3 against bending.
  • Support members in the form of levelling jacks 4 are arranged vertically beneath the guideway 2 and are accurately aligned with the web 3 in order to receive the vertical load directly without causing bending of the bench structure.
  • a longitudinal ridge 6 is provided beneath the lower plate 1' and rests on the upper end of the levelling jack 4. The latter bears in turn on a concrete foundation 5.
  • Two tie-rods 10 are embedded in the foundation 5 and extend vertically upwardly, being disposed sym-' metrically on opposite sides of the web 3.
  • the lower ends of the tie-rods 10 have frusto-conical foot portions 10' which are embedded in the foundation 5 and which increase in cross section vertically downwardly.
  • the upper ends of the tie-rods 10 are screw-threaded and extend with clearance through holes 11 in the lower plate 1.
  • the web 3 has two cross arms 8 welded to and extending symmetrically outwardly from its opposite faces.
  • the cross arms 8 carry at their ends eye-shaped portions 9 through which the screwthreaded upper ends of the respective tie-rods 10 pass.
  • Respective nuts 12 are screwed on the screw-threaded ends of the tie-rods 10 and engage through respective washers 12' the upper surfaces of the respective eyeshaped end portions 9 of the cross arms 8. The nuts 12 can be adjusted from the outside through access apertures 13 provided in the upper plate 1 on each side of the guideway 2.
  • the tie-rods 10 are pretensioned, by adjustment of the nuts 12, to the same extent, so that they exert preload on the jack 4 without deforming the bench structure.
  • Equality of the pretensioning of the tie-rods may be achieved by using a level placed on the guideway 2 and extending laterally during adjustment of the nuts 12. Inequality of the tensions in the rods 10 will cause a departure of the guideway 2 from the horizontal, which will be indicated by the level.
  • the two tie-rods 10 act on respective cross arms which are integral parts of a common yoke member 1-4.
  • the yoke member 14 has eye-shaped ends 17 engageable by the respective tie-rods 10 through respective nuts 12 in the same manner as in the embodiment of FIG. 1.
  • the yoke member 14, which is fully independent of the bench structure, extends through an aperture 15 in the vertical web 3 and exerts a downward force resulting from pretensioning of the tie-rods 10 on a bearing block 16 secured to the lower plate 1' of the bench in the aperture 15.
  • the block 16 has an upper surface which is convexly curved in a plane perpendicular to the plane of the web 3.
  • Flanged retaining members 18 are secured to the lower plate 1 in juxtaposition to the opposite ends of the yoke member 14 to check rocking movement thereof in a vertical plane, and to retain the yoke member 14 in the absence of the nuts 12.
  • a slide bench of a machine tool including an adjustable pack, the elements of said jack forming a central support member for the slide bench, a foundation on which said jack rests, and a vertical web through which vertical loads are transmitted to said jack, the improvement comprising: prestressing means for preloading the support member, said prestressing means comprising two tie-rods embedded in and extending vertically upwardly from the foundation, said tie-rods being secured to and disposed symmetrically on opposite sides of the web, respective cross arms extending outwardly with respect to opposite sides of the web and engaged by the upper ends of the respective tie-rods, and means pretensioning the tie-rods to cause the cross arms to exert a pre-load directly on said jack.
  • a slide bench of a machine tool including a central support member for the slide bench in the form of an adjustable jack, a foundation on which the support member rests, and a vertical web through which vertical loads are transmitted to the support member, the improvement which comprises prestressing means for preloading the support member, said prestressing means comprising two tie-rods embedded in and extending vertically upwardly from the foundation, said tie-rods being disposed symmetrically on opposite sides of the web, respective cross arms extending outwardly with respect to opposite sides of the web and engaged by the upper ends of the respective tie-rods, and means for pretensioning the tie-rods, said pretensioning means comprising nuts screwthreaded on the upper ends of the tie-rods, pretensioning of said tie-rods being effected by screwing down of the respective nuts through access apertures on the upper surface of the slide bench to thereby exert a downwardly directed preload centrally on the bench support member.
  • a slide bench of a machine tool including a central support member for the slide bench, a foundation on which the support member rests, and a vertical web through which vertical loads are transmitted to the support member, the improvement which comprises prestressing means for preloading the support member, said prestressing means comprising two tie-rods embedded in and extending vertically upwardly from the foundation, said tie-rods being disposed symmetrically on opposite sides of the web, a yoke member, respective cross arms being integral parts of the yoke member and extending outwardly with respect to opposite sides of the web and engaged by the upper ends of the respectivetie-rods, means defining an aperture in the vertical web above the support member through which aperture the yoke member passes, retainingmembers fixed to the machine tool slide bench and arranged in juxtaposition to opposite ends of the yoke member to check rocking movement thereof in a vertical plane, and means pretensioning the tie-rods to cause the cross arms to exert a downwardly directed preload centrally on the bench support member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Presses And Accessory Devices Thereof (AREA)
US706334A 1967-10-20 1968-02-19 Prestressing of support members for slide benches of large machine tools Expired - Lifetime US3512738A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5343667 1967-10-20

Publications (1)

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US3512738A true US3512738A (en) 1970-05-19

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US (1) US3512738A (de)
DE (1) DE1752724B1 (de)
GB (1) GB1193376A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2434462A1 (fr) * 1978-08-22 1980-03-21 Sulzer Ag Dispositif de fixation de caissons d'entreposage de faisceaux d'elements combustibles nucleaires sur le fond d'un bassin rempli d'eau
US4295620A (en) * 1978-02-17 1981-10-20 Commissariat A L'energie Atomique Device for anchoring a vessel in a horizontal foundation raft
US4331314A (en) * 1980-05-22 1982-05-25 Allis-Chalmers Corporation Hydraulic pump/turbine discharge ring support anchorage
US6134850A (en) * 1999-02-03 2000-10-24 Taiwan Semiconductor Manufacturing Company, Ltd Method and fixture for mounting process equipment
US20120080567A1 (en) * 2010-09-30 2012-04-05 Asahi Organic Chemicals Industry Co., Ltd. Base plate
US10197214B2 (en) * 2013-11-05 2019-02-05 Onguard Group Limited Securing assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978574A (en) * 1975-08-26 1976-09-07 Stith Jr Morris Randall Method of positioning and supporting a machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973427A (en) * 1932-06-25 1934-09-11 William M Brock Tower footing
US2881876A (en) * 1953-02-20 1959-04-14 W H Nicholson And Company Cubicle assembly
US3289369A (en) * 1964-08-11 1966-12-06 Spring City Foundry Company Light standard base hold down

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973427A (en) * 1932-06-25 1934-09-11 William M Brock Tower footing
US2881876A (en) * 1953-02-20 1959-04-14 W H Nicholson And Company Cubicle assembly
US3289369A (en) * 1964-08-11 1966-12-06 Spring City Foundry Company Light standard base hold down

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295620A (en) * 1978-02-17 1981-10-20 Commissariat A L'energie Atomique Device for anchoring a vessel in a horizontal foundation raft
FR2434462A1 (fr) * 1978-08-22 1980-03-21 Sulzer Ag Dispositif de fixation de caissons d'entreposage de faisceaux d'elements combustibles nucleaires sur le fond d'un bassin rempli d'eau
US4306397A (en) * 1978-08-22 1981-12-22 Sulzer Brothers Limited Mounting means for a storage container for fuel assembly clusters
US4331314A (en) * 1980-05-22 1982-05-25 Allis-Chalmers Corporation Hydraulic pump/turbine discharge ring support anchorage
US6134850A (en) * 1999-02-03 2000-10-24 Taiwan Semiconductor Manufacturing Company, Ltd Method and fixture for mounting process equipment
US20120080567A1 (en) * 2010-09-30 2012-04-05 Asahi Organic Chemicals Industry Co., Ltd. Base plate
US8740173B2 (en) * 2010-09-30 2014-06-03 Asahi Organic Chemicals Industry Co., Ltd. Base plate
US10197214B2 (en) * 2013-11-05 2019-02-05 Onguard Group Limited Securing assembly

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Publication number Publication date
DE1752724B1 (de) 1971-12-02
GB1193376A (en) 1970-05-28

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