US3848370A - Work feed devices for centreless grinding machines - Google Patents

Work feed devices for centreless grinding machines Download PDF

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Publication number
US3848370A
US3848370A US00305347A US30534772A US3848370A US 3848370 A US3848370 A US 3848370A US 00305347 A US00305347 A US 00305347A US 30534772 A US30534772 A US 30534772A US 3848370 A US3848370 A US 3848370A
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US
United States
Prior art keywords
piston
spindle
grinding machine
workpiece
abutment
Prior art date
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Expired - Lifetime
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US00305347A
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English (en)
Inventor
G Garcin
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.)
NTN SNR Roulements SA
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Societe Nouvelle de Roulements SNR SA
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Filing date
Publication date
Application filed by Societe Nouvelle de Roulements SNR SA filed Critical Societe Nouvelle de Roulements SNR SA
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Publication of US3848370A publication Critical patent/US3848370A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/35—Accessories

Definitions

  • a work feed device for a centreless grinding machine comprises a cylinder housing a pusher piston, rigid with a workpiece-supporting shoe and a control piston.
  • the control piston is linked to the pusher piston by resilient means in the form of a cushion of compressed gas and by a telescopic element which determines the maximum spacing between the pistons.
  • pressure of the compressed gas is adjustable.
  • Feed devices have also been proposed in which the whole of the machine table, which is very heavy, is advanced.
  • the inertia is quite considerable with respect to the cutting stresses.
  • resonance phenomena arise which make it necessary to use dampers.
  • the device comprises a cylindrical body in which are slidingly mounted a pusher piston which is rigid with one of the shoes which support the piece to be ground, a control piston linked to the said pusher piston by resilient means, the force of which is regulable, and by a telescopic retaining element limiting the maximum spacing between the two pistons.
  • a workpiece to be ground having been taken over by a support face by virtue of an eccentric arrangement and rotation, becomes centred on the shoes.
  • the pusher piston carrying the shoe connected with the control piston by virtue of the telescopic retaining element and the resilient means, also moves forward, pushing the workpiece so that it contacts the grinder.
  • This thrust can for example be regulated so that it is very low at the moment of contact between the workpiece and the grinder to avoid deterioration of the grinder on the rough workpiece, the thrust increasing progressively to reach its maximum when the workpiece is smoothed. The workpiece is thus accurately ground, without any impact, and wear on the grinder is minimal.
  • FIG. 1 is a longitudinal section of a workpiece feed device in accordance with the invention, the device being shown in its configuration prior to a grinding operation;
  • FIG. 2 is a section similar to FIG. 1 but showing the device during smoothing of a ground workpiece.
  • a workpiece in the form of a ring 20 or other rotatable body is mounted on takeover.
  • a grinding machine which comprises a magnetic support face 3, a shoe2 which is mounted to pivot about a spindle 24 on a support element 25 which is fixed, and a shoe 1 which is mounted to pivot about a spindle 26 on an end portion of a pusher piston 5 this latter shoe being a so-called 3-hour shoe.
  • the work piece 20, which is engageable by a grinder in the form of a grinding wheel 4, rests on the face 3 and on the shoes 1 and 2; the workpiece 20 follows the shoe 1 during its return movement while being supported on the shoe 2 and on the magnetic face 3.
  • the workpiece feed device comprises a cylindrical body 12 in which are slidingly mounted the pusher piston 5 which carries the shoe 1, and a control piston 6 connected to operating means, not shown in the drawings, and capable of communicating to the piston 6 a displacement according to the double-headed arrow F, F! I
  • a chamber 19 enclosing a cushion of compressed air, the chamber 19 being connected to a source of compressed air by port 11. This cushion of compressed air repels the pistons 5, 6 in relation to each other and enables the control piston 6, during its movement, to be rendered rigid with the pusher piston 5.
  • a telescopic retaining element 7 which at one of its ends has a plate 21 which is screwed and locked in a threaded bore 27 of the pusher piston 5 and has at its other end a head 14 which is mounted to slide in a bore 13 of the control piston 6.
  • the distance separating the pusher piston 5 from the control piston 6 is limited by the head 14 of the telescopic'retaining element 7 which is arranged to abut the end portion of stop screws 15 which are carried by the control piston 6.
  • a spindle 28 slidable eoaxially within the retaining element 7 has a head 28a arranged to contact a sensor 29 of a feeler 9 mounted in the control piston and linked with smoothing control means.
  • the other end of the spindle 28 is arranged to contact circular abutment means 8 located in a bore 30 in the piston 5 and eccentrically keyed on a spindle 23 jour- V to each other and which slide on the spindle 23 during axial displacement of the piston 5 whereby to maintain the piston in a specific angular position.
  • the spindle 23 extends on one side to the exteriorof the cylindrical body 12 and enables the abutment means 8 to be given a selected angular displacement.
  • the bore 31 in the cylindrical body 12, inside which the pistons 5 and 6 slide, comprises a helical oil groove 16 which discharges into a concentric groove 17 in a forwards direction and into a concentric groove 18 in the rearwards direction. Escape of greasy air occurs at the two ends of the bore 31, so avoiding the ingress of foreign bodies. Greasy air flows through the oil groove 16 to provide an aerostatic suspension to the pistons 5 and 6 in the bore 31 of the cylindrical body 12, and thus to permit movement of the pistons with very low friction.
  • This pressure is low at the moment of contact between the workpiece 20 .and the grinding wheel 4 in order to prevent the surface of the grinding wheel from being damaged by the workpiece which initially has a rough surface, the pressure increasing progressively to reach a suitable contact pressure.
  • the forward feed of the pusher piston 5 ceases when the plate 2.1 of the retaining element 7 contacts the eccentric abutment means 8. Since the spindle 28 is likewise braced against the abutment 8, it is displaced slightly rearwardly and its head 28a contacts the sensor 29 of the feeler 9 which detects the position of the piston 5 and controls the smoothing operation, this position beingmaintained for a period of time predetermined by a timing device. Then the feeler controls the return movement of the piston 5 and that of the ground workpiece 20 which follows the shoe 1 as described before.
  • the feed device described has a low inertia and al- 10 lows the grinding wheel to follow the entire surface of the workpiece What is claimed is: p 1.
  • a centreless grinding machine means defining a support face for a workpiece, a shoe for supporting the workpiece radially, and a workpiece feed device, said feed device comprising cylinder means, a first piston mounted in the cylinder means and carrying the shoe 20 a second, control piston mounted in the cylinder means,
  • the head means being slidable in the second piston, and the second piston including abutment means for the head means, the abutment 40 means limiting movement of the said element.
  • spindle means said spindle means being slidable in the retaining element and being arranged to engage the abutment means, and sensor means engaging the spindle means when the spindle means engages the abutment means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
US00305347A 1971-12-27 1972-11-10 Work feed devices for centreless grinding machines Expired - Lifetime US3848370A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7146832A FR2166493A5 (US07534539-20090519-C00280.png) 1971-12-27 1971-12-27

Publications (1)

Publication Number Publication Date
US3848370A true US3848370A (en) 1974-11-19

Family

ID=9088160

Family Applications (1)

Application Number Title Priority Date Filing Date
US00305347A Expired - Lifetime US3848370A (en) 1971-12-27 1972-11-10 Work feed devices for centreless grinding machines

Country Status (5)

Country Link
US (1) US3848370A (US07534539-20090519-C00280.png)
JP (1) JPS4877473A (US07534539-20090519-C00280.png)
FR (1) FR2166493A5 (US07534539-20090519-C00280.png)
GB (1) GB1381615A (US07534539-20090519-C00280.png)
IT (1) IT976196B (US07534539-20090519-C00280.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050239376A1 (en) * 2002-07-17 2005-10-27 Erwin Junker Method and device for grinding a rotating roller using an elastic steady-rest support
CN103038023A (zh) * 2010-07-30 2013-04-10 特诺恩股份公司 用于研磨保持在中心件之间的产品的对立设备
CN103522134A (zh) * 2013-09-18 2014-01-22 浙江威能消防器材股份有限公司 铝瓶内壁打磨机
CN105935909A (zh) * 2015-12-19 2016-09-14 綦江祥和机械有限公司 一种圆柱齿轮内孔打磨设备
CN116352603A (zh) * 2023-05-22 2023-06-30 华辰精密装备（昆山）股份有限公司 精密磨床气动中心架装置、控制方法及精密磨床

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60134654U (ja) * 1984-02-17 1985-09-07 株式会社　細川活版所 配送用複写伝票
CN109623555B (zh) * 2018-12-29 2021-03-23 重庆市合川区金星玻璃制品有限公司 一种用于玻璃杯杯口的加工设备
CN112809470A (zh) * 2021-01-20 2021-05-18 浙江科菱智能装备有限公司 一种防护型无心磨自动上下料机构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24202A (en) * 1859-05-31 Hand-lever
US2086024A (en) * 1935-11-22 1937-07-06 Norton Co Hydraulically operated steady rest
US3032935A (en) * 1960-03-22 1962-05-08 Heald Machine Co Grinding machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US24202A (en) * 1859-05-31 Hand-lever
US2086024A (en) * 1935-11-22 1937-07-06 Norton Co Hydraulically operated steady rest
US3032935A (en) * 1960-03-22 1962-05-08 Heald Machine Co Grinding machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050239376A1 (en) * 2002-07-17 2005-10-27 Erwin Junker Method and device for grinding a rotating roller using an elastic steady-rest support
US7008294B2 (en) * 2002-07-17 2006-03-07 Erwin Junker Maschinenfabrik Gmbh Method and device for grinding a rotating roller using an elastic steady-rest support
CN103038023A (zh) * 2010-07-30 2013-04-10 特诺恩股份公司 用于研磨保持在中心件之间的产品的对立设备
US20130122790A1 (en) * 2010-07-30 2013-05-16 Tenova S.P.A. Contrast device for the grinding of products held between centres
CN103522134A (zh) * 2013-09-18 2014-01-22 浙江威能消防器材股份有限公司 铝瓶内壁打磨机
CN105935909A (zh) * 2015-12-19 2016-09-14 綦江祥和机械有限公司 一种圆柱齿轮内孔打磨设备
CN116352603A (zh) * 2023-05-22 2023-06-30 华辰精密装备（昆山）股份有限公司 精密磨床气动中心架装置、控制方法及精密磨床
CN116352603B (zh) * 2023-05-22 2023-08-29 华辰精密装备（昆山）股份有限公司 精密磨床气动中心架装置、控制方法及精密磨床

Also Published As

Publication number Publication date
JPS4877473A (US07534539-20090519-C00280.png) 1973-10-18
DE2257498A1 (de) 1973-07-12
DE2257498B2 (de) 1976-11-04
GB1381615A (en) 1975-01-22
FR2166493A5 (US07534539-20090519-C00280.png) 1973-08-17
IT976196B (it) 1974-08-20

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