US2485866A - Holder for die grinding - Google Patents

Holder for die grinding Download PDF

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Publication number
US2485866A
US2485866A US2251A US225148A US2485866A US 2485866 A US2485866 A US 2485866A US 2251 A US2251 A US 2251A US 225148 A US225148 A US 225148A US 2485866 A US2485866 A US 2485866A
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United States
Prior art keywords
die
grinding
holder
base plate
central opening
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Expired - Lifetime
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US2251A
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Axel F Cronlund
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Individual
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Priority to US2251A priority Critical patent/US2485866A/en
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Publication of US2485866A publication Critical patent/US2485866A/en
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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
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17017—Self-centering of floating

Definitions

  • This invention relates to a die holder and more particularly to a holder for positioning a wire drawing die in a grinding or lapping machine.
  • the die when it became necessary to grind a wire drawing die, the die was placed in a cylindrical cup and fixed in position with set screws that extended through threaded openings in the sides of the cup. The cup holding the fixed die was then placed upon the work platform of the grinding machine, the revolving grinding pin was brought into engagement with the die and a liquid solution of an abrasive in suspension allowed to flow thereover. "When the grinding operation was completed, the die was removed from the cylindrical cup by hand and washed in a solvent oil to remove the adhering abrasive particles.
  • Another object of my invention is to provide such a die holder which allows the die to be inserted or removed expeditiously by means of a tool, thereby eliminating the need for the operator to expose his skin to the harmful effects of the materials used in die grinding and cleaning operations.
  • Figure 1 is a perspective view, with parts broken away, showing a wire drawing die positioned within the die holder of my invention.
  • Figure 2 is a cross-sectional view showing the 2 Claims. (Cl. 51-217) details of .the retension means of the invention.
  • reference numeral 2 indicates a cup-shaped cylindrical case in which is removably fitted a base plate I having a central opening 6 therethrough.
  • the sides of case 2 project upwardly from the base plate I so as to confine the grinding compound to the surface of the base plate and prevent it from splashing over the outer edges thereof.
  • a shoe 8 is mounted on the projecting end of each of four compression springs ID.
  • the die contacting surfaces of the shoes 8 are shaped to fit against the outer surface of a die l2;
  • Each of the springs l0 project into the opening 6 from a radial hole ll which is threaded internally and extends horizontally through the base member 4.
  • An adjusting screw I6 is screwed into the outer end of each hole i l.
  • the shaft of screw 16 is provided with a reduced end portion l8 which projects from the hole id in the direction of the shoe 8 and is surrounded by the spring Ill
  • the abutment on the shaft of screw It at the base of the reduced portion forms a bearing surface for In operation, the die [2 is placed in the central opening 6 and the shoes 8 brought in contact with the outer side surface of die I2 by turning the adjusting screw l6 of each of the spring members Ill until the die I2 is positioned firmly and held';
  • the plate member 4 is then inserted into the case 2 which, in turn, is mounted on the platform of, the lap ping or grinding machine and operationscompleted in the usual manner.
  • the abrasive solution used during the operation drains through holes 20 and the holes provided'at the bottom of the case 2.
  • the operator may then remove the die from the central opening 6 by inserting the prongs of a pair of forceps, tongs or similar tool in the openings between shoes 8;to grip the die l2 and lift it out. If desi'rable,, the,
  • a die holder comprising a cup-shaped cas ing, a base plate having a central opening therethrough, the sides of said casing projecting up- 1 wardly from said base plate, the peripheral surface of said base plate being in slidable contact with the inner wall of said casing so that the base plate can be readily removed from the casing, said base plate having at least one vertical drain hole therethrough, said base plate having a plurality of spaced-apart, internally threaded, radial holes therein extending horizontally from its outer side to said central opening, a compression spring in each of said horizontal holes projecting therefrom into said central opening, a shoe mounted on the projecting end of each of said springs, said shoes being shaped to fit against the outside surface of the die, and an adjusting screw threaded into the outside end of each of said horizontal holes and ing having an open upper end, a base plate having a central opening therethrough, the peripheral surface of said base plate being in slidable con- '4 tact with the inner wall of said casing so that the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Description

Oct. 25, 1949. v F. CRQNLUND 2,485,866
HOLDER FOR DIE GRINDING v Filed Jan. 1 4, 1948 IN VEN TOR.
4X51 g: CPG/VLU/VU,
Patented Oct. 25, 1949 UNITED STATES PATENT OFFICE HOLDER FOR DIE GRINDING Axel F. Cronlund, Joliet, in. Application January 14, 1948, Serial No. 2,251
1 This invention relates to a die holder and more particularly to a holder for positioning a wire drawing die in a grinding or lapping machine.
Heretofore, when it became necessary to grind a wire drawing die, the die was placed in a cylindrical cup and fixed in position with set screws that extended through threaded openings in the sides of the cup. The cup holding the fixed die was then placed upon the work platform of the grinding machine, the revolving grinding pin was brought into engagement with the die and a liquid solution of an abrasive in suspension allowed to flow thereover. "When the grinding operation was completed, the die was removed from the cylindrical cup by hand and washed in a solvent oil to remove the adhering abrasive particles.
One of the shortcomings of this method was the time consuming operation involved in manipulating the set screws to position and firmly fix the die within the cylindrical cup preparatory to grinding and in removing the die after grinding was completed.
Another serious disadvantage inherent in this method was the need for the operator to handle the die with his bare fingers after the grinding operation and also after the solvent rinse, thereby subjecting'his skin to the deleterious effects of the abrasive solution and the solvent oil. It has been found that the abrasive solutions and the oil solvents commonly used in this type of operation are irritating to the human skin and contact with them frequently causes infection or other skin afliictions.
It is an object of my invention to provide a die holder which will hold a die securely in the correct position during a grinding or lapping operation.
Another object of my invention is to provide such a die holder which allows the die to be inserted or removed expeditiously by means of a tool, thereby eliminating the need for the operator to expose his skin to the harmful effects of the materials used in die grinding and cleaning operations.
It is still another object of my invention to provide such a die holder that is simple and rugged in construction and inexpensive to manufacture.
These and other objects will become more apparent after referring to the following specification and attached drawing, in which:
Figure 1 is a perspective view, with parts broken away, showing a wire drawing die positioned within the die holder of my invention; and
Figure 2 is a cross-sectional view showing the 2 Claims. (Cl. 51-217) details of .the retension means of the invention.
Referring more particularly to the drawing, reference numeral 2 indicates a cup-shaped cylindrical case in which is removably fitted a base plate I having a central opening 6 therethrough. The sides of case 2 project upwardly from the base plate I so as to confine the grinding compound to the surface of the base plate and prevent it from splashing over the outer edges thereof. A shoe 8 is mounted on the projecting end of each of four compression springs ID. The die contacting surfaces of the shoes 8 are shaped to fit against the outer surface of a die l2; Each of the springs l0 project into the opening 6 from a radial hole ll which is threaded internally and extends horizontally through the base member 4. An adjusting screw I6 is screwed into the outer end of each hole i l. The shaft of screw 16 is provided with a reduced end portion l8 which projects from the hole id in the direction of the shoe 8 and is surrounded by the spring Ill The abutment on the shaft of screw It at the base of the reduced portion forms a bearing surface for In operation, the die [2 is placed in the central opening 6 and the shoes 8 brought in contact with the outer side surface of die I2 by turning the adjusting screw l6 of each of the spring members Ill until the die I2 is positioned firmly and held';
in position in the center of central opening 6 by means of the compressive force exerted by the contacting shoes 8. The plate member 4, so prepared, is then inserted into the case 2 which, in turn, is mounted on the platform of, the lap ping or grinding machine and operationscompleted in the usual manner. The abrasive solution used during the operation drains through holes 20 and the holes provided'at the bottom of the case 2. After the grinding or lappingoperation has been completed, the operator may then remove the die from the central opening 6 by inserting the prongs of a pair of forceps, tongs or similar tool in the openings between shoes 8;to grip the die l2 and lift it out. If desi'rable,, the,
die may be allowed to remain in the, die holderand the entire holder immersed in a solvent oil to been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims:
I claim:
1. A die holder comprising a cup-shaped cas ing, a base plate having a central opening therethrough, the sides of said casing projecting up- 1 wardly from said base plate, the peripheral surface of said base plate being in slidable contact with the inner wall of said casing so that the base plate can be readily removed from the casing, said base plate having at least one vertical drain hole therethrough, said base plate having a plurality of spaced-apart, internally threaded, radial holes therein extending horizontally from its outer side to said central opening, a compression spring in each of said horizontal holes projecting therefrom into said central opening, a shoe mounted on the projecting end of each of said springs, said shoes being shaped to fit against the outside surface of the die, and an adjusting screw threaded into the outside end of each of said horizontal holes and ing having an open upper end, a base plate having a central opening therethrough, the peripheral surface of said base plate being in slidable con- '4 tact with the inner wall of said casing so that the base plate can be readily removed from the casing, the sides of said casing projecting upwardly from said base plate, said base plate having at least one vertical-hole therethrough, said base plate having a plurality of spaced-apart.
rn y threaded, radial holes therein extend ing l emfits outer; side to said cen REFERENCES SPEED The following references are of record in the file of this patent:
UNITED STATES PATENTS
US2251A 1948-01-14 1948-01-14 Holder for die grinding Expired - Lifetime US2485866A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711106A (en) * 1971-09-03 1973-01-16 Budd Co Centering device for a chuck
US4593450A (en) * 1984-11-13 1986-06-10 Tektronix, Inc. Precision lock tooling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1334898A (en) * 1919-06-27 1920-03-23 Gyllsdorff Torston Alfonso Reamer
US1499989A (en) * 1923-04-20 1924-07-01 Lehmann Franz Vise for use with machine tools
US2416703A (en) * 1945-06-22 1947-03-04 Wilbert P Marshall Crystal indexing fixture
US2428248A (en) * 1945-01-30 1947-09-30 Charles W Strong Work holding attachment for surface grinders

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1334898A (en) * 1919-06-27 1920-03-23 Gyllsdorff Torston Alfonso Reamer
US1499989A (en) * 1923-04-20 1924-07-01 Lehmann Franz Vise for use with machine tools
US2428248A (en) * 1945-01-30 1947-09-30 Charles W Strong Work holding attachment for surface grinders
US2416703A (en) * 1945-06-22 1947-03-04 Wilbert P Marshall Crystal indexing fixture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711106A (en) * 1971-09-03 1973-01-16 Budd Co Centering device for a chuck
US4593450A (en) * 1984-11-13 1986-06-10 Tektronix, Inc. Precision lock tooling

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