US3897660A - Apparatus for automatically removing fins of castings - Google Patents

Apparatus for automatically removing fins of castings Download PDF

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Publication number
US3897660A
US3897660A US504930A US50493074A US3897660A US 3897660 A US3897660 A US 3897660A US 504930 A US504930 A US 504930A US 50493074 A US50493074 A US 50493074A US 3897660 A US3897660 A US 3897660A
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Prior art keywords
hone
work
air spring
component
automatically removing
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Expired - Lifetime
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US504930A
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English (en)
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Kenji Chijiiwa
Katsuo Shirahige
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    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load
    • 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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor

Definitions

  • ABSTRACT An apparatus for automatically removing fins of castings wherein respective air springs are provided to resist a component in the normal direction and a com ponent in the tangential direction with respect to the hone grinding surface of the contact surface of a hone and work of the grinding resistance applied to the grindinghone and are made to be fed with air pressures set in response to the size, thickness and the material of the tin of the work and a motor to control the work in the direction of the component in the normal direction and a motor to control it in the direction of the component in the tangential direction by converting the displacements of the above mentioned air springs to electric signals with two differential transformers are provided.
  • the removed amount of the fin will vary.
  • the grinding is auto mated, self-dressing will be made, therefore the state of the cutting blade of the hone will vary and the ground amount will come to be different.
  • the memory tape in the tracing system and the instruction tape in the numerical value control unless the fin removing operation starts at the start setting point for the work and the working is made at the same speed, the work and tape will deviate from each other, a large grinding resistance will be applied to the hone and the hone and work will be likely to break.
  • the grinding speed can not be adjusted in response to the material, size and thickness of the fin.
  • the desire to make the grinding speed high in the part having no tin and to make it low in the part where the fin is hard and thick can not be satisfied.
  • the grinding part is constantly repeatedly moved in the position but does not stop in a fixed position due to the inertia.
  • the stopping position is related with the characteristics of the motor, the weight of the grinding part and the precision and friction of the sliding part of the apparatus and there is no function of absorbing the inertia for the variation of the cutting speed. Therefore, an impact force will be likely to be applied to the work and hone.
  • An object of the present invention is to provide an apparatus for automatically removing fins of castings wherein the above mentioned defects of the conventional fin grinding are eliminated.
  • FIG. 1 is an explanatory view of the state of contact of a hone and work with each other.
  • FIG. 2 is an elevation of an embodiment of the present invention.
  • FIG. 3 is a plan view of FIG. 2.
  • FIG. 4 is a partly sectioned elevation of a hone shaft unit.
  • FlGv 5 is an explanatory view of the controlling relation of the hone and work.
  • FIGS. 6u-d are explanatory views of the positions of the hone. work and the core of a differential transformer C.
  • H65. 711 and h are views showing the relation of the positions of differential transformer and core.
  • FIG. 8 is a block diagram showing the controlling relations of the differential transformers C and D and mo tors M, and M
  • a grinding hone is supported with air springs so that the tip of the grinding hone in contact with a work may act as a feeler for detecting fins with a component Fn in the normal direction and a component Ft in the tangential direction with respect to the hone grinding surface as shown in FIG. 1 and the displacements of the air springs produced by the fluctuation of the grinding resistance may be converted to electric signals by differential transformers to control the displacements of the work or hone and to automatically remove fins of castings.
  • l is a rotary hone set on a supporting stand 16
  • M is a motor for driving the hone through a belt and set on a supporting stand 2.
  • W is a work.
  • 3 is a fin to be ground.
  • 4 and 5 are sup porting stands. The work on the supporting stand 4 is rotated by a motor M set on the stand 5.
  • a supporting stand 6 is moved through a screw rod 8 in the direction of the X axis by a motor M provided on the base 7.
  • a motor M is provided on the supporting stand 6.
  • the supporting stand 5 is moved by a screw rod 9 in the direction of the Y axis.
  • a supporting stand 30 is provided through a rotary shaft 42 on a supporting stand 10 on the base 7.
  • a supporting pillar ll is provided on the supporting stand 30.
  • a supporting plate 13 is made movable up and down by a motor M through a screw rod 12 in the direction of the Z axis.
  • [4 is a nut fitted to the above mentioned screw rod 12 and fixed on one end surface to the above mentioned supporting plate 13.
  • the supporting stand 2 is at right angles to the supporting plate 13.
  • the supporting stand 2 and 16 are connected with each other by means of a pin 17 through a supporting frame 15 of the supporting stand 2.
  • Air springs (bellows) A and A and a differential transformer C are provided between the above mentioned supporting stands 2 and 16.
  • the air spring A is fed with an air pressure Pn preset by the later described method but will be displaced by the force in the direction of the component Fn of the hone and the displacement will be detected by the differential transformer C.
  • the air spring A is also fed with an air pressure P'n (Pn 3 P'n) to stabilize the displacement of the supporting stand 2.
  • a hone shaft unit shall be explained in the following with reference to FIG. 4.
  • hone to grind fins of works
  • rotary shaft 32 a pulley 31 provided at one end of the rotary shaft 32 to hang belts
  • differential transformer D to detect anaxial displacement of the hone by the component Fl applied in the axial direction of the hone
  • air springs B and B to resist the component Ft
  • pressure receiving plates 18 and 19 bearings 20 and 21, stroke bearings 22 and 23
  • hone shaft barrel 24 a hone shaft barrel 24.
  • the hone rotary shaft 32 is rotatably supported in both shoulder parts with bearings 20 and 21 which are also supported respectively with the pressure receiving plates 18 and 19 which can slide within the hone barrel 24 so that the hone shaft 32 may be displaced in the axial direction while rotating.
  • the air springs B and B are provided respectively between the pressure reeeiving plates 18 and 19 and the 3 end walls 33 and 34 of the hone shaft barrel 24.
  • the internal pressure Pt and P't of the air springs are fed from a compressed air source respectively through pressure reducing valves. passages 25 and 26 in the walls 33 and 34 and annular paths 3S and 36.
  • an L-shaped lever 27 is provided to project out of one end of the outer peripheral side of the pressure receiving plate I8 and to come out of the hone shaft barrel 24 through a cut groove 28 of the hone shaft barrel 24.
  • the end part of the lever 27 is in contact with the tip of a shaft 39 of a core 37 of the differential transformer D fixed to the outside of the hone shaft barrel 24 through a pressing force of a spring 38.
  • the above mentioned air spring 8 is to stabilize the displacement of the hone shaft.
  • the fin of the casting is made to approach the hone without rotating the casting (the movement of the work in the direction of the X axis by the motor M is controlled), a part of the fin is experimentally ground while producing a component Fn and. just when the grinding ends (in the state of (C) in FIG. 6), the required air pressure Pn of the air spring may be determined.
  • the Ft at this time will be of the maximum value as of Ft. Therefore, the air pressure P! which can resist it may be set by rotating the cock of the pressure reducing valve.
  • the pressures P'n and P! of the air springs A and B may be so set as to be Pn Z P'n and Pt 5. P! by rotating another cock of the pressure reducing valve.
  • Fri 0 and a core 41 of the differential transformer C may be displaced upward by the force of a spring 40 as illustrated.
  • the voltage generated by the differential transformer C in this case will be positive.
  • FIG. 7, 10 shows the position of the core and its generated voltage is shown by V0.
  • the differential transformer is C and the motor M rotates with the output of the later described Schmidt circuit to control the linear movement in the direction of the X axis of the work.
  • the control of the rotation of the work by the motor M is made in the relation of the component F air spring B and differential transformer D.
  • First step The motor M to feed the work with respect to the hone normally rotates at a high speed.
  • Second step The grinding of the fin in the part in contact with the hone while Fn is being produced begins but the work does not rotate.
  • Seventh step The grinding of the fin ends and the motor M reversely rotates at a low speed to return to the original fixed position.
  • the electromotivc voltage of the differential transformer C will be an input in the Schmidt circuit S. and, by its output, the motor M, will be normally rotated at a high speed through a relay R to make the work of the first step.
  • the relay R will be switched over to a current source for low speeds and the motor M will normally rotate at a low speed and the fin grinding in the third step will be also made.
  • the current source of the motor M will be cut by the relay R through the Schmidt circuit and at the same time the relay R will be operated to switch on the current source of the motor M that is to say, the work will begin to rotate.
  • the differential transformer I) will be in the state of V... [See (h) in FIG. 7
  • the motor M will remain stopped, the electromotive force from the differential transformer D will become V, and, by the relay R the motor M, will be switched over to the normal rotation at a low speed to grind the fin.
  • the electromotive force of the differential transformer D will be in the state of V the Schmidt circuit S will operate the relay R the motor M, will be reversly rotated and the motor M, will be stopped.
  • a rotary shaft 42 is provided between the supporting stands 10 and 30 so as to be used on manually setting the position of the hone with respect to the work.
  • the present invention is of such formation as is described above, therefore has an effect of eliminating various defects of the conventional grinding of fins and is summarized as follows:
  • the advance of the work will stop.
  • the work receives a force from the hone, the work will retreat. That is to say, as the tip of the hone acts as a feeler of a fin detector, even if the outside diameter of the hone varies, the tip of the bone will be always in contact with the root of the fin.
  • the matrix of the profiling system, program of the numerical value control and magnetic tape tracing memory are not required.
  • the starting point of the working can be freely selected anywhere.
  • the inertia force of the grinding head caused by the high speed of the working can be adjusted by adjusting the pressure of the air spring.
  • the operation of removing fins of castings can be reasonably and simply automated.
  • An apparatus for automatically removing fins of castings characterized by comprising a first air spring means for resisting a component in the normal direction with respect to the hone grinding surface of the contact surface of a hone and work of the grinding resistance applied to the grinding hone, a second air spring means for resisting a component in the tangential direction, a means of feeding said two air spring means with desired air pressure set in response to the fin of the work, a first differential transformer for converting the displacement of said first air spring means to an electric signal, a second differential transformer for converting the displacement of said second air spring to an electric signal, a first motor means for controlling said work in the direction of said component in the normal direction and a second motor means for controlling said work in the direction of said component in the tangential direction.
  • An apparatus for automatically removing fins of castings characterized in that said first air spring means is provided between two parallel supporting stands which are connected with each other by means ofa pin through a supporting frame of one of the supporting stands.
  • a hone shaft unit includes said second air spring means and second differential transformer.
  • said hone shaft unit further includes a hone rotary shaft, a pulley provided at one end of said rotary shaft to hang belts, a pair of pressure receiving plates, a pair of bearings, a pair of stroke bearings provided on the outer periphery of said shaft and a hone shaft barrel containing these members.
  • An apparatus for automatically removing fins of castings characterized in that the air pressure of said first air spring means is set by the formula wherein Fn is a component in the normal direction with respect to the hone grinding surface of the contact surface of the hone and work Pn is a component in the tangential direction, 1 is a distance between the pin and air spring means and L is a distance between the pin and the contact point of the fin and hone.
  • An apparatus for automatically removing fins of castings characterized in that the air pressure of said second air spring means is set by rotating a pressure reducing valve so as to feed an air pressure corresponding to said component in the tangential direction just when the grinding ends.
  • An apparatus for automatically removing fins of castings according to calim 1 characterized in that said means of feeding the first air spring means with an air pressure comprises a compressed air source, a pressure reducing valve and paths.
  • An apparatus for automatically removing fins of castings characterized in that said means of feeding the second air spring means with an air pressure comprises a compressed air source. a pressure reducing valve, paths in both end walls of the shaft barrel and annular paths.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US504930A 1973-09-17 1974-09-11 Apparatus for automatically removing fins of castings Expired - Lifetime US3897660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10467173A JPS5316949B2 (fr) 1973-09-17 1973-09-17

Publications (1)

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US3897660A true US3897660A (en) 1975-08-05

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US504930A Expired - Lifetime US3897660A (en) 1973-09-17 1974-09-11 Apparatus for automatically removing fins of castings

Country Status (5)

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US (1) US3897660A (fr)
JP (1) JPS5316949B2 (fr)
DE (1) DE2443829C3 (fr)
FR (1) FR2243783B1 (fr)
GB (1) GB1433709A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370835A (en) * 1979-12-18 1983-02-01 Peter Wolters Working pressure control mechanism
US4428162A (en) 1979-07-26 1984-01-31 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Grinding machine and control for removing burrs or fins from workpieces such as castings
US4545153A (en) * 1983-12-12 1985-10-08 Charlton Associates Force sensor for controlling polishing pad pressure
US4602459A (en) * 1985-02-15 1986-07-29 Mar Engineering, Inc. System for active error compensation during machining
US4753048A (en) * 1986-03-20 1988-06-28 Massachusetts Institute Of Technology Method of for grinding
US4811522A (en) * 1987-03-23 1989-03-14 Gill Jr Gerald L Counterbalanced polishing apparatus
EP1057592A1 (fr) * 1998-01-22 2000-12-06 Nitta Corporation Meuleuse-presseuse
CN103846758A (zh) * 2014-03-07 2014-06-11 常州法尔林精机有限公司 加工铸造曲面毛坯涨沙及飞边的数控修边机床
CN104985166A (zh) * 2015-07-22 2015-10-21 中国重型机械研究院股份公司 一种精密铸件自动切割装置及方法
CN107139039A (zh) * 2017-07-13 2017-09-08 合肥北顾信息科技有限公司 一种计算机生产用磨边装置
CN108098497A (zh) * 2017-12-25 2018-06-01 苏波 一种齿轮的去毛刺装置
CN109015123A (zh) * 2018-09-12 2018-12-18 上海交通大学 自动打磨装置及方法
CN109397016A (zh) * 2018-11-02 2019-03-01 王振海 一种汽车零件加工用打磨装置
CN112170868A (zh) * 2019-07-03 2021-01-05 上海交通大学 基于力-位融合反馈的棱边去毛刺工艺方法及系统

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110191A (en) * 1977-03-08 1978-09-26 Katsura Kikai Seisakushiyo Yuu Trimming device
EP0052273A1 (fr) * 1980-11-06 1982-05-26 Georg Fischer Aktiengesellschaft Dispositif pour l'usinage de pièces
DE3305423C2 (de) * 1982-02-18 1987-03-05 Dr. Horst Nahr GmbH, 8530 Neustadt Verfahren zum Steuern des spanabhebenden Materialabtrages und Vorrichtung zu seiner Durchführung
JPS6062464A (ja) * 1983-09-10 1985-04-10 Kawasaki Steel Corp 回転砥石による金属帯の側端研削装置
FR2584966A1 (fr) * 1985-07-18 1987-01-23 Cousances Haut Fourneau Fonder Dispositif pour l'usinage d'un objet par contact d'au moins un outil
DE3803855C1 (fr) * 1988-02-09 1989-03-16 Wilhelm 8372 Zwiesel De Koenig
CH678827A5 (fr) * 1989-03-29 1991-11-15 Werner Lueber
CN108326664B (zh) * 2017-12-27 2021-03-16 安徽若聪科技有限公司阜南分公司 一种机械式圆形工件边角打磨装置
CN113245435B (zh) * 2021-03-30 2022-06-21 广东铭祺五金实业有限公司 一种五金件冲压毛刺去除装置
CN118386087B (zh) * 2024-06-26 2024-10-01 潍坊天信散热器有限公司 用于压铸散热器鳍片表面处理的抛磨装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274738A (en) * 1964-02-13 1966-09-27 Heald Machine Co Grinding machine
US3672100A (en) * 1969-03-04 1972-06-27 Riv Officine Di Villar Perosa Speed control device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3274738A (en) * 1964-02-13 1966-09-27 Heald Machine Co Grinding machine
US3672100A (en) * 1969-03-04 1972-06-27 Riv Officine Di Villar Perosa Speed control device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4428162A (en) 1979-07-26 1984-01-31 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Grinding machine and control for removing burrs or fins from workpieces such as castings
US4370835A (en) * 1979-12-18 1983-02-01 Peter Wolters Working pressure control mechanism
US4545153A (en) * 1983-12-12 1985-10-08 Charlton Associates Force sensor for controlling polishing pad pressure
US4602459A (en) * 1985-02-15 1986-07-29 Mar Engineering, Inc. System for active error compensation during machining
US4753048A (en) * 1986-03-20 1988-06-28 Massachusetts Institute Of Technology Method of for grinding
US4811522A (en) * 1987-03-23 1989-03-14 Gill Jr Gerald L Counterbalanced polishing apparatus
EP1057592A1 (fr) * 1998-01-22 2000-12-06 Nitta Corporation Meuleuse-presseuse
EP1057592A4 (fr) * 1998-01-22 2006-10-04 Nitta Corp Meuleuse-presseuse
CN103846758A (zh) * 2014-03-07 2014-06-11 常州法尔林精机有限公司 加工铸造曲面毛坯涨沙及飞边的数控修边机床
CN104985166A (zh) * 2015-07-22 2015-10-21 中国重型机械研究院股份公司 一种精密铸件自动切割装置及方法
CN107139039A (zh) * 2017-07-13 2017-09-08 合肥北顾信息科技有限公司 一种计算机生产用磨边装置
CN108098497A (zh) * 2017-12-25 2018-06-01 苏波 一种齿轮的去毛刺装置
CN108098497B (zh) * 2017-12-25 2019-08-27 浙江坤泰模具股份有限公司 一种齿轮的去毛刺装置
CN109015123A (zh) * 2018-09-12 2018-12-18 上海交通大学 自动打磨装置及方法
CN109015123B (zh) * 2018-09-12 2020-09-29 上海交通大学 自动打磨装置及方法
CN109397016A (zh) * 2018-11-02 2019-03-01 王振海 一种汽车零件加工用打磨装置
CN112170868A (zh) * 2019-07-03 2021-01-05 上海交通大学 基于力-位融合反馈的棱边去毛刺工艺方法及系统
CN112170868B (zh) * 2019-07-03 2022-03-15 上海交通大学 基于力-位融合反馈的棱边去毛刺工艺方法及系统

Also Published As

Publication number Publication date
DE2443829C3 (de) 1979-03-29
FR2243783A1 (fr) 1975-04-11
DE2443829B2 (fr) 1978-08-03
GB1433709A (en) 1976-04-28
JPS5055536A (fr) 1975-05-15
DE2443829A1 (de) 1975-04-03
FR2243783B1 (fr) 1976-10-22
JPS5316949B2 (fr) 1978-06-05

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