US3778935A - Abrading apparatus with rotary index table - Google Patents

Abrading apparatus with rotary index table Download PDF

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Publication number
US3778935A
US3778935A US00220977A US3778935DA US3778935A US 3778935 A US3778935 A US 3778935A US 00220977 A US00220977 A US 00220977A US 3778935D A US3778935D A US 3778935DA US 3778935 A US3778935 A US 3778935A
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United States
Prior art keywords
abrading
worktable
workpiece
nozzle
switch
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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
US00220977A
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English (en)
Inventor
J Callahan
M Capdeville
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Pennwalt Corp
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Pennwalt Corp
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Publication date
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Assigned to MIDLANTIC NATIONAL BANK, 100 WALNUT AVE., CLARK, NJ 07066 reassignment MIDLANTIC NATIONAL BANK, 100 WALNUT AVE., CLARK, NJ 07066 SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SSW ACQUISTION CORP.
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
    • B24C3/22—Apparatus using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
    • B24C3/20—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by turntables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/322—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for electrical components

Definitions

  • An abrading apparatus has a rotatably reciprocating worktable, and a vertical nozzle for directing an abrasive stream downwardly toward the worktable.
  • the worktable has a plurality of workpiece holding zones thereon, each being designed to locate and secure a workpiece which is to be abraded.
  • a control system is provided which includes a manual-automatic switch, the latter permitting the apparatus to be operated in either of two modes. In the manual mode, an operator depresses a switch to index the worktable to bring a holding zone, and consequently a workpiece under the abrading nozzle; the operator then depresses a second switch to initiate and complete the abrading operation. In the automatic mode, the operator depresses a single switch to index the worktable, and initiate and complete the abrading operation. In both modes, as
  • the operator is locating another in the holding zone which will subsequently be moved under the abrading nozzle.
  • the present invention relates in general to abrading apparatus for carefully removing material from a workpiece such as a miniature electrical resistor. More particularly, it relates to abrading apparatus having an improved control systemwhich indexes a rotary worktable to bring a workpiece under an abrading nozzle, and then automatically initiates the abrading operation.
  • Miniature electrical resistors have a conductive film of electrically resistant material on a non-conductive substrate between spaced terminals. Such miniature resistors are made by first printing a slightly excessive amount offilm on the substrate, and then removing a portion of the film between the terminals so as-to reduce the cross-sectional area disposed between the terminals until the electrical resistance of the element is adjusted upwardly to the desired value.
  • Various means have been developed,.and are in use at the present, to quickly and accurately locate the workpiece or substrate on the worktable beneath the abrading nozzle.
  • One such means is a clamping device which provides a three point contact for securely and accurately locating a substrate or workpiece under the abrading nozzle, the clamping device being fixed to the worktable to define a workpiece holding zone thereon.
  • Such a device is clearly described in US. Pat. No. 3,577,682.
  • each workpiece must be manually removed after the abrading operation, and another inserted in its place after which the abrading operation is once again initiated. While this clamping device allows the workpiece to be accurately located beneath the abrading nozzle, the abrading operation must be completed before another workpiece can be inserted.
  • Another means for rapidly and accurately locating a workpiece beneath the abrading nozzle includes having a plurality of locator pins mounted in the worktable to define a workpiece holding zone. Such pins are utilized in the invention disclosed in the instant application. Heretofore however, only a single holding zone has been so defined on the worktable.
  • the worktable is initially adjusted by means of a suitable mechanism, e.g., a mechanism as described in US. Pat. No. 3,593,459, in order to locate the holding zone and consequently the workpiece, beneath the abrading nozzle. After the initial adjustment, the position of the worktable with respect to the abrading nozzle does not change throughout an abrading operation.
  • an abrading apparatus which is capable of high speed production, one which will permit locating and securing one workpiece on the worktable while another is being simultaneously abraded.
  • the present invention relates to abrading apparatus in general, but more particularly to abrading apparatus provided with a rotary worktable, and an improved control system for operating the apparatus.
  • the rotary worktable has two workpiece holding zones thereon for locating and holding the workpieces.
  • the operator locates a first workpiece on one of the holding zones, and then actuates a control mechanism to index the worktable and bring the holding zone and workpiece beneath the abrading nozzle, after which the abrading operation automatically begins.
  • the operator locates a second workpiece on the other holding zone on the worktable.
  • the operator again actuates the control mechanism to index the worktable, and bring the second workpiece beneath the nozzle after which the abrading operation is once again automatically initiated; indexing the worktable also brings the first or finished workpiece to the operator, who then removes the finished workpiece, and replaces it with another workpiece which is to be abraded.
  • FIG. 1 is a perspective view of an abrading apparatus constructed and arranged for carrying out the invention.
  • FIG. 2 is a plan view of the rotary worktable showing two workpieces mounted in place in their respective holding zones.
  • FIG. 3 illustrates an electrical control system for carrying out the present invention.
  • FIG. 4 illustrates a pneumatic control system carrying out the present invention, this system being utilized in conjunction with the electrical control system illustrated in FIG. 3.
  • abrading apparatus 10 including an abrading nozzle designated generally by the numeral 12, the nozzle including a hood 13 which surrounds the nozzle outlet (not shown).
  • a source of vacuum is connected to the interior of hood 13 to remove the abrasive powder and other residue during the operation of the apparatus.
  • a high velocity abrasive stream issues from nozzle 12, and is directed downwardly toward the rearwardly located workpiece l4 (miniature electrical resistor in the present example) located on rotary worktable 16.
  • the flow of airborne abrasive particles is initiated by the energization of a solenoid operated pinch valve in the upstream end of a supply conduit.
  • the outlet of nozzle 12 has a restricted orifice e.g., 0.0l8 inch diameter of much smaller cross-sectional flow area than the supply conduit leading into the nozzle.
  • the supply conduit is supplied with abrasive powder by a mixing chamber where dry, filtered, pressurized air about 85 psi from a compressor is uniformly mixed in the desired proportions with abrasive powder from a reservoir.
  • Each workpiece 14 being an electrical resistor having a fixed electrically resistive film printed on a correspondingly shaped substrate, is trimmed by movement of nozzle 12 across the surface thereof until the electrical resistance of the resistor is adjusted upwardly to the desired value, at which time the trimming (abrading) operation is automatically terminated.
  • an electronic control and measuring system utilizing a bridge circuit measures or monotors the resistance during the trimming operation and stops the trimming when a predetermined resistance value has been reached. This operation is more fullydescribed in the last mentioned patent, and the structure comprising the probe 18 and the arcuate supporting arm on which the latter probes are mounted, are more fully described and illustrated in U.S. Pat. No. 3,551,807.
  • probes 18 are lifted via arm 20 from the surface of workpiece 14 at the termination of the trimming operation.
  • the operator has mounted a second workpiece 14 on the front of the worktable 16, and upon actuation of theproper control (such as a footswitch), worktable 16 is indexed to move the latter mentioned workpiece from a loading zone around to an abrading zone under nozzle 12, and move the finished workpiece in opposite or reverse direction back to the front into the loading zone so that the operator may remove the latter and replace it with another resistor which is to be trimmed.
  • the loading zone is outside the abrading zone.
  • Arm 20 is pivotally mounted within casing or cabinet 22 in order to allow the probes 18 to be lowered onto the surface of the workpiece prior to initiating the trimming operation, and raised when the trimming operation is completed.
  • a pneumatic cylinder 24 is utilized to rotate the worktable through a suitable rack and pinon arrangement (see FIG. 4).
  • a line 25 is connected to the rearward side of each end of cylinder 24 to alternately supply and exhaust opposite ends thereof.
  • X-Y slide structure 26 is more fully described in U.S. Pat. No. 3,593,459, but is utilized in the present embodiment to provide the initial adjustment in order to be certain that each of the workpieces 14 will be rotated to the desired location under nozzle 12 upon indexing the worktable.
  • worktable 16 is indexed by rotating the same in a clockwise or counterclockwise direction until member 28 (mounted beneath worktable 16) contacts stops 30 or 32, the latter being stationarily mounted on the apparatus 10.
  • a button 34 also mounted beneath I worktable 16 contacts and closes either microswitches S2 and S4, or $1 and S3, the effects of which will be more fully described below.
  • Worktable 16 is always in one extreme position or the other, and consequently one pair or the other of the above mentioned microswitches is closed while the other pair is open.
  • worktable 16 is indexed by rotatably reciprocating the same 180, alternating between clockwise or counterclockwise directions of rotation during successive movements, as indicated by the arrow 36.
  • This serves to move a workpiece 14 to a position in the abrading zone beneath nozzle 12 after which the trimming operation is automatically initiated by means described more fully hereinafter.
  • a finished workpiece which has just been abraded is moved to the front into a loading zone so that the operator can remove the same and replace it with another workpiece which is to be abraded.
  • each workpiece 14 is located against a plurality of locator pins 38 which protrude from the upper surface of work table 16.
  • pins 38 define two workpiece holding zones or spaced apart workpiece holders, the workpieces being securely held in these zones by means of vacuum lines (not shown) which extend through the surface of the table.
  • vacuum lines not shown
  • Such a vacuum holding means is well known in the art and forms no part of the present invention.
  • worktable 16 is initially adjusted via X-Y slide structure 26 so that the rearwardly located workpiece is in the desired location beneath nozzle 12. After this initial adjustment, each rotation of worktable 16 will move one of the workpieces to a position beneath nozzle 12. As the workpiece in the rearward location is being trimmed, the operator locates a second workpiece against pins 38, and upon completion of the trimming or abrading operation on the rearwardly located workpiece, the operator actuates the proper control to rotate table 16 via cylinder 24 to index the table, thus moving the lattermentioned workpiece to a position beneath nozzle 12, and moving the finished workpiece to the front where it is removed by the operator, and another workpiece inserted in its place. This operation is continually repeated, thus resulting in high speed production.
  • microswitches 81-83 or 82-84 will be closed depending upon the position of the worktable.
  • microswitches 31-83 are closed (shown open in FIG. 3)
  • microswitches 82-84 are open
  • probes 18 are down, i.e., in contact with the resistor whichis to be trimmed
  • RL 1 is energized.
  • RL 1 being energized, its normally open contacts E-F and G-H will now be closed; the G-H contacts are latching contacts for holding in the RL 1 relay.
  • lf switch 814R is now closed (shown open in FIG. 3) RL 2 is energized thus closing its normally open contacts C-D and l-J, and opening its normally closed contacts A-B.
  • Switch S5 now closes, energizing solenoid 44 through RL 2 contacts 1-].
  • worktable l6 indexes, opening microswitches 81-83.
  • the entire electrical circuit is de-e nergized during the indexing period because during the brief time that worktable 16 is rotating, microswitches Sit-S3 and 52-84 are all open as shown in FIG. 3. Dotted lines 39 and 41 indicate that these microswitches operate in pairs.
  • microswitches S2S4 close (see FIG. 2 also), re-energizing probe lift solenoid 4t) and consequently lowering probes 18. Only when probes 18 are lifted from the surface of a resistor 14 can worktable 16 rotate. As a result of probe lift solenoid 44 being re-energized, RL 1 is again energized thus resetting the system.
  • the trimming or abrading operation may be initiated either manually or automatically. It is initiated manually by depressing either footswitch S14L, or pushbutton S11. Switch S7 is shown in the manual position.
  • FIG. 4 The pneumatic system for carrying out the present invention is illustrated in FIG. 4.
  • a portion of the air entering line 46 is directed through a second pressure regulator R2, through a re der 47 as indicated by dotted line 52. Consequently, as
  • switch S7 is in the automatic position.
  • switch S7 is in the manual position, either switch S14L or S11 must be actuated to initiate the trimming operation, after actuating 514R to index the worktable. If switch S7 is placed in the automatic po- 6 sition prior to beginning a production run, the operator need only actuate the single switch 814R thereafter to index the table and trim each workpiece or resistor.
  • valve V2 is an either-or type valve meaning that the valve stays in the last position to which it was moved until receiving a signal through one of the solenoids 42 or 44 (see FIG. 3 also).
  • Worktable 16 is rotated, first l in one rotational direction and then in opposite rotational direction, by means of rack 66.
  • the rack 66 is reciprocated by the force of the pressure differential on its pistons and drives pinions 68, the latter being connected to the worktable by a shaft 69 (see FIG.
  • worktable 16 stays in one or the other of its extreme positions until. valve V2 is shifted once again via one of the solenoids 42 or 44.
  • the indexing means rotatably reciprocates the worktable 16 to move the workpiece holders alternately first in one direction to position one of the holders in the abrading zone and the other holder in the loading zone, and then in reverse or opposite direction in. order to position the holder which had been in the abrading zone in the loading zone and to position the holder which had been in the loading zone in the abrading zone.
  • S5 (see FIG. 3) is mechanically linked to probe lift cylinder 47, so that upon lifting probes 18, switch S5 will be shifted to the position opposite that illustrated in FIG. 3 so that worktable 16 can be indexed.
  • the worktable l6 cannot be indexed as long as probes 18 are contacting a resistor or workpiece 14.
  • switches 814R and S14L are contained in a single primary footswitch, 514R being the right pedal, and SML being the left pedal thereof. Each of these switches is illustrated in its normal position in FIG. 3, i.e., when neither pedal of the primary footswitch has been depressed by the operator.
  • Abrading apparatus comprising a. a nozzle for directing a stream of abrading material to an abrading zone;
  • a worktable having first and second holders spaced apart thereon, each holder being adapted to hold a workpiece, said worktable being rotatable in a generally horizontal plane to position one of said holders at a time in said abrading zone and simultaneously to position the other of said holders in a loading zone outside said abrading zone;
  • indexing means for rotatably reciprocating said worktable to move said holders alternately first in one direction to position said first and second holders in the abrading and loading zones respectively, and then opposite to said one direction to position said first and second holders in the loading and abrading zones respectively;
  • Abrading apparatus and further including means having a plurality of probes engageable with a workpiece in said abrading zone for monitoring a characteristic of said workpiece and terminating the flow of said abrasive stream when a predetermined value of said characteristic has been reached.
  • Abrading apparatus according to claim 2, and further including means for preventing the indexing of said worktable while said probes are contacting said workpiece.
  • said indexing means includes abutment means for stopping the rotation of said worktable at selected positions.
  • Abrading apparatus and further including slide means for adjusting the position of said worktable with respect to said abrading nozzle, said worktable being mounted to said slide means and adapted to slide in a plurality of directions which are perpendicular to each other.
  • said indexing means includes a rack and pinion arrangement, said pinion being in driving relation to said worktable, a rack geared in driving relation to said pinion, and a reciprocating pneumatic cylinder in driving relationship with said rack.
  • Abrading apparatus selectively operable in manual and automatic modes having electrical circuitryassociated with said indexing means and said initiating means including: a first switch for actuating said indexing means and said initiating means for automatic mode operation, and a second switch for actuating said initiating means independently of said first switch for manual mode operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Machine Tool Units (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
US00220977A 1972-01-26 1972-01-26 Abrading apparatus with rotary index table Expired - Lifetime US3778935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US22097772A 1972-01-26 1972-01-26

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US3778935A true US3778935A (en) 1973-12-18

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US00220977A Expired - Lifetime US3778935A (en) 1972-01-26 1972-01-26 Abrading apparatus with rotary index table

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US (1) US3778935A (sv)
JP (1) JPS4884400A (sv)
DE (1) DE2261001A1 (sv)
FR (1) FR2169667A5 (sv)
GB (2) GB1352114A (sv)
IT (1) IT973854B (sv)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845586A (en) * 1973-05-15 1974-11-05 Pennwalt Corp Abrading apparatus
US5364472A (en) * 1993-07-21 1994-11-15 At&T Bell Laboratories Probemat cleaning system using CO2 pellets
WO2002035585A1 (en) * 2000-10-20 2002-05-02 Lightwave Microsystems, Inc. Apparatus and method to dice integrated circuits from a wafer using a pressurized jet
CN114952590A (zh) * 2022-04-26 2022-08-30 大连理工大学 一种大型齿轮单向磨粒流分度抛光装置及方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD244939B1 (de) * 1985-12-23 1988-06-29 Geraberg Thermometer Vorrichtung zur relativpositionierung zwischen wirkstueck, werkzeug und messsonde
US4893440A (en) * 1986-05-01 1990-01-16 Airsonics License Partnership Abrasive jet machining
US4733503A (en) * 1986-05-01 1988-03-29 Airsonics License Partnership Abrasive jet machining
DE3620788A1 (de) * 1986-06-20 1987-12-23 Bosch Gmbh Robert Substrattraeger fuer ein laserabgleichsystem und verfahren zu dessen herstellung
GB2213986A (en) * 1987-12-16 1989-08-23 Philips Electronic Associated Fabrication of resistors in microwave and other circuits
CN105643297B (zh) * 2016-03-10 2017-12-01 南京初见装饰设计有限公司 一种机械加工用机床安装架
CN110548921B (zh) * 2019-07-31 2020-08-04 广东吉视金属科技有限公司 具有校正装置的不锈钢薄板裁切装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE389343C (de) * 1922-10-17 1924-01-29 Kabel Vogel & Schemmann Ag Sandstrahlgeblaese, besonders zur Bearbeitung von Gussstuecken auf einem umlaufenden Werkstuecktisch mittels schwenkbarer Duesen
US2365152A (en) * 1943-07-14 1944-12-19 Stearman Aviat Inc Sandblast turntable
US3142942A (en) * 1960-06-09 1964-08-04 Ind Tool Engineering Company Braking device for indexing machine
US3262234A (en) * 1963-10-04 1966-07-26 Int Rectifier Corp Method of forming a semiconductor rim by sandblasting
US3534503A (en) * 1967-08-21 1970-10-20 Pennwalt Corp Abrading apparatus
US3685209A (en) * 1970-08-20 1972-08-22 Comco Supply Inc Apparatus for trimming electrical resistors
US3694972A (en) * 1969-06-20 1972-10-03 Reimer Emeis Method and apparatus for subdividing a crystal wafer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE389343C (de) * 1922-10-17 1924-01-29 Kabel Vogel & Schemmann Ag Sandstrahlgeblaese, besonders zur Bearbeitung von Gussstuecken auf einem umlaufenden Werkstuecktisch mittels schwenkbarer Duesen
US2365152A (en) * 1943-07-14 1944-12-19 Stearman Aviat Inc Sandblast turntable
US3142942A (en) * 1960-06-09 1964-08-04 Ind Tool Engineering Company Braking device for indexing machine
US3262234A (en) * 1963-10-04 1966-07-26 Int Rectifier Corp Method of forming a semiconductor rim by sandblasting
US3534503A (en) * 1967-08-21 1970-10-20 Pennwalt Corp Abrading apparatus
US3694972A (en) * 1969-06-20 1972-10-03 Reimer Emeis Method and apparatus for subdividing a crystal wafer
US3685209A (en) * 1970-08-20 1972-08-22 Comco Supply Inc Apparatus for trimming electrical resistors

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845586A (en) * 1973-05-15 1974-11-05 Pennwalt Corp Abrading apparatus
US5364472A (en) * 1993-07-21 1994-11-15 At&T Bell Laboratories Probemat cleaning system using CO2 pellets
WO2002035585A1 (en) * 2000-10-20 2002-05-02 Lightwave Microsystems, Inc. Apparatus and method to dice integrated circuits from a wafer using a pressurized jet
CN114952590A (zh) * 2022-04-26 2022-08-30 大连理工大学 一种大型齿轮单向磨粒流分度抛光装置及方法
CN114952590B (zh) * 2022-04-26 2024-02-27 大连理工大学 一种大型齿轮单向磨粒流分度抛光装置及方法

Also Published As

Publication number Publication date
JPS4884400A (sv) 1973-11-09
FR2169667A5 (sv) 1973-09-07
IT973854B (it) 1974-06-10
GB1352114A (en) 1974-05-08
GB1352115A (en) 1974-05-08
DE2261001A1 (de) 1973-08-02

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Owner name: MIDLANTIC NATIONAL BANK, 100 WALNUT AVE., CLARK, N

Free format text: SECURITY INTEREST;ASSIGNOR:SSW ACQUISTION CORP.;REEL/FRAME:004996/0012

Effective date: 19880906