Patent GB-1111321-A (GB)
Title: Forming method and machine
IPC: B24B47/06
Filed: 1965-05-31
Abstract: 1,111,321. Grinding. BENDIX CORPORATION. 31 May, 1965 [1 June, 1964], No. 23135/65. Heading B3D. A method for forming the first of a co-operating pair of first and second flow controlling components by reference to desired flow conditions obtained through co-operation of a formed second component with a reference first component comprises the steps of (i) fastening the reference first component to the first component for positioning therewith; (ii) relatively positioning the reference first component and the formed second component in an operating fluid environment to obtain a first desired flow condition determined by a first flow controlling surface on the reference component; (iii) relatively positioning a forming means and the first component to a first forming position and forming a corresponding first flow controlling surface thereon; and (iv) positioning the reference first component relative to the formed second component, with the first component and the reference first component relative fastened, in a sense and through a displacement. modifying a basic relative displacement between the first component and the forming means in each instance to the extent as necessary to obtain a second desired flow condition determined by a second flow controlling surface on the reference first component to thus relatively position the first component and the forming means from the first to a second forming position, and forming a corresponding second flow controlling surface on the first component at the second forming position, whereby the first component is formed to cooperate with the second component to desired performance conditions while compensating for physical variations in the second component. In grinding flow controlling edges of lands on a piston 11 to be used in a cylinder 12, correct positioning of the piston 11 is obtained by using a master piston 13 of nominal configuration in the cylinder 12. A carriage 15 is movable back and forth on a base 14, the position of the carriage being indicated by a scale 17 on the carriage cooperating with a precision indicator 20 on the base. The carriage can be clamped to the base by means 57. The master piston 13 is detachably mounted by threaded connection 26 to a support part 21 of the carriage. The cylinder 12 is fastened by bolts 23 to a support 22 having an arm 28 which can be locked by a knob 30 to a slotted member 29 on the base 14. On releasing knob 30, the support 22 can be adjusted relative to the carriage 15 by means 55, 56 and locked to the carriage by means 54. A carrier 18 for the piston 11 is mounted on the carriage 15 for transverse movement to feed the piston to a grinding wheel 24 on a support 19 adjustable on the base 14 in the direction of movement of the carriage 15. Oil from a reservoir 36 is supplied by a pump 38 through a flow meter 41. When a valve 45 is opened, oil is supplied to cylinder 12, leaving through port 34 controlled by land edge 32a of piston 13, the piston and cylinder being relatively adjusted to give the desired flow as indicated by meter 41. When a valve 44 is opened, oil is supplied to cylinder 12, leaving through port 35 controlled by land edge 33a of piston 13, the piston and cylinder again being relatively adjusted to give the desired flow as indicated by meter 41. Operation.-Means 54 is released to free support 22 from carriage 15. By means 55, 56 support 22 is adjusted relative to carriage 15 to position cylinder 12 relative to master piston 13 at a first position determined by the desired flow condition obtained through co-operation of land edge 32a and port 34. Carriage 15 is locked to the base by means 57 with the corresponding land edge of piston 11 positioned for grinding. Carrier 18 is moved toward and away from the grinding wheel 24 to form the land edge 32. The carriage 15 is unlocked from the base 14 and moved through a basic distance (nominal spacing of lands minus nominal stroke), taking with it the piston 11, the cylinder 12 and the master piston 13. Support 22 is released from carriage 15 and locked to the base 14 by knob 30. Carriage 15 is moved to position the master piston 13 relative to cylinder 12 at a second position determined by the desired flow condition obtained through co-operation of land edge 33a and port 35. Carriage 15 is locked to base 14 and the land edge 33 ground.