US2241735A

US2241735A - Process and apparatus for finishing valve seats and the like

Info

Publication number: US2241735A
Application number: US275123A
Authority: US
Inventors: Wilbert W Redsecker
Original assignee: Penn Electric Switch Co
Current assignee: Penn Electric Switch Co
Priority date: 1939-05-22
Filing date: 1939-05-22
Publication date: 1941-05-13
Anticipated expiration: 1958-05-13

Description

May 13 1941- w. w. REDSECKER 2,241,735 PROCESS AND APPARATUS FOR FINISHING VALVE SEATS AND THE LIKE Filed May 22, 1939 i. 1 iH-IHH' i /w Y y Patented May 13, 1941 PROCESS AND APPARATUS FOR FINISHING VALVE SEATS AND THE LIKE Wilbert W.

Redsecker, Goshen,

Ind.. assignor to Penn Electric Switch Co., Goshen, Ind., a corporation of Iowa Application May 22, 1939, Serial No. 275,123

11 clama (o1. vs -1)l An object of my invention is to provide a process for finishing valve seats and the like, together with apparatus of simple, durable and inexpensive construction for practicing the process.

Another object is to provide a process which contemplates the steps of engaging a valve seat with a forming tool and thereafter periodically alternately increasing and decreasing the pressure of the valve seat against the forming tool so that the material of the valve seat adjacent the forming tool is compacted and rendered harder and thereby longer wearing, without any destructive tendencies, however, occasioned by hammering action of the valve seat against the forming tool during the process of finishing the valve seat.

A further object is to provide a process which can be readily practiced by a comparatively simple apparatus that can be economically operated by compressed air or other actuating uid.

Still another object is to provide apparatus in the ferm of a forming tool with which the valve seat may be engaged, and mechanism being pro'- vided to place the valve seat under engagement `pressure with the forming tool and to alternately increase and decrease the pressure of engagement.

Another object is to provide the apparatus with cylinder and piston means controlled by a control valve having a restricted orifice and a popoff valve as the means to increase and decrease the engagement pressure of the valve seat with the forming tool, thus effecting the desired finishing of the valve seat. Y

With the foregoing and other objects in view, my process consists in the steps hereinafter specically described and in the construction, arrangement and combination of the various parts of my apparatus whereby the process is performed and objects of the invention contemplated are attained, all as hereinafter more fully set forth; vpointed out in my claims and illustrated in the vaccompanying drawing. ratus is susceptible of a variety of embodiments, it yis unnecessary to fully describe and illustrate more than one form thereof in order togive a full understanding of the apparatus both from its structural and functional standpoints, and of the steps of the process as practiced by the use of the 'apparatus disclosed. On the accompanying drawing:

In Figure l, I illustrate diagrammatically my apparatus partially in front elevation and partially in section as it appears during operation thereof;

In Figure 2, I illustrate an enlarged central sec- Although the appai the valve is in the full line Y the heads I8,

tional view through the valve seat and valve forming tool to show how these parts coact with each other during the performance of the process, and

In Figures 3 and 4 I illustrate an enlarged diagrammatic cross-section of the edge of the valve seat showing the structure thereof before and after the finishing process. l

Onjthe accompanying drawing I have used' the reference numeral I to indicate asrnain base, and I2 an auxiliary base. The auxiliary base I2 is slidable toward and away from the observer of Figure 1 in guideways formed in the base I0. A forming tool consisting of a post I3, a foot I4 and a forming pin l5 is slidably mounted in guideways of the auxiliary base I2 for movement toward and away from the observer.

A valve seat supporting plate I6 is provided which is slidably mounted on vertical pins IT of the auxiliary base I2.` The pins I1 have heads I3. Springs I9 normally engage the plate I6 with as shown by dotted lines in Figure l.

A cylinder support extends upwardly from the main base I0 and supports a cylinder 2|. Within the cylinder 2| is a piston 22, from which extends a piston rod 23. The piston rod 23 extends slidably through a head 24 of the cylinder 2| and the piston is normally constrained to assume a raised position, as shown by dotted lines. under the action of a spring 25 when all air is released from the cylinder 2|.

Within the cylinder 2I, I preferably provide a supply of oil 2% forsealing and lubricating purposes. and to prevent this oil from being undesirably expelled a'stop 21 may be provided.

A supply pipe 23 for actuating fluid such as compressed air is connected with a control valve 29. The control valve in turn is connected by a pipe to the cylinder 3l. The control valve 23 is adapted to admit air tothe cylinder 2| when to permit air to be expelled therefrom to atmos phere when in the dotted line position. A restricted orifice or pulsation plug 3| is provided for admitting air to the control valve 2! at only a limited velocity.

A pop-off or pressure relief valve 32 communi- Cates with the cylinderv 2|, the purpose of which` will hereinafter be fully explained. A pressure indicating dial 33 may be connected with the cylinder 2| for convenience of the operator in determining at all times the pressure within the cylinder.

The supporting plate I6 is adapted to support a valve seat 34 which in turn is supported by a position shown, and

valve body 35, in which the seat is to remain and eventually be sold with the valve body. `The valve body illustrated happens to be for a solenoid valve having a coil core 36. This core, formed of brass or the like, is welded or otherwise suitably secured in a mounting nut 3'I screwed into the valve body 35. The

parts

34, 35, 36 and 3'I being thus all assembled together, are in proper alinement for the desired valve seat nishing operation. 'Ihe post I3 ts the tube 35 so as to aline the forming tool I5 with the seat 34 in the position that eventually the solenoid plunger will assume. j

' Practical operation In the operation of my apparatus to finish valve seats according to my process, the auxiliary base I2 is pulled forwardly toa position where the valve body 35 may be removed without interference with the piston rod 23. The valve 35 together with its

parts

34, 35 and 31 may thereupon be readily removed and another similar assembly placed in position. The base I2 is thereupon pushed back into position against the back I2a of the basel!! which serves as a stop for the base I2. The piston rod 23 is then alined with the valve body 35 and the control valve 29 is then opened 'as to the full line position in Figure 1. 'I'hsIwiIl result in air owing from the pipe 28 intdthe cylinder 2|, as indicated by the solid line arrows. The air pressure will cause the piston rod 23- to move downwardly from its dotted position, first engaging the valve body 35 and then pushing it together with the plate I 5 downwardly from its dotted position until the valve seat 34 engages the forming tool I5. The valve body 35 and the supporting plate I6 are then in their solid line positions. The tool I5 is preferably made of very hard material, such as tungsten carbide, accurately finished to the desired taper and highly polished so as to eventually provide a very smooth surface for the valve seat in the seat member 34, which memberr is usually formed of brass or the like.

After the piston rod 23 engages the valve seat member 34 with the forming pin I5, the pressure in the cylinder 2| will be built up until it is relieved by the pop-off valve 32. The sudden relief of pressure will decrease the pressure of the piston rod 23 on the valve body 35 and thereby decrease the pressure of the valve seat member 34 on the formingpin I5. 'I'he decrease of pressure, however, will not go to zero, so that the parts 34 and I5 are retained in engagement and there will be--alternate increase and decrease of the engagement pressure .as the pressure is built up again in the cylinder 2I after the popoil' valve 32 closes.ithus completing a cycle of operation. Such. cycles will be repeated as long as the valve 29 remains in the full line position.

The alternate increase and decrease of pressure will occur periodically several times a second, depending upon various factors such as the setting of the pop-ofi' valve 32, the pressure in the line 23 and the size of the orifice 3l. Thus, I am able by a very simple apparatus to keep the parts I 5 and 34 in engagement, yet alternately increase and decrease the pressure somewhat like a hammering action without at any time separating the parts from each other and there- Y after causing impact between them. Operation of the device produces adefinite hammerlike sound. 'I'he characteristics of the highly polished forming point I5 will be impressed upon the valve seat. The portion 34a of the valve seat, as indicated in Figure 3, will be somewhat increased lthe apparatus for a diiierent size o1' valve, the

principle of operation of my apparatus, but desire it to be understood that the process may be .varied to some extent and the apparatus disclosed is only illustrative and therefore maybe ycarried out by other means within the scope of the appended claims.

I claim as new and desire to secure by Letters Patent o1' the United States:

1. In apparatus for finishing valve seats and the like, a base, a support for a forming tool, a forming tool mounted thereon, said support being slidably mounted relative to said base, a support for a valve seat, said last support being also slidable relative to said base, means for biasing said last support to a limited elevation relative to said base, means for urging said last support downwardly against the force of said biasing introducing actuating uid to said cylinder, a pop-oil valve communicating with said cylinder, and means for supplying actuating fluid to said control valve through a restricted orifice.

2. In apparatus for finishing valve seats and said control valve through a restricted orifice.

3. In apparatus for finishing valve seats and the like, a orming tool, means for engaging a Valve seat with said forming tool and for theremenl fOr biasing said support to a limited elevation relative to said base, a cylinder mounted stationary relative to said base, a piston therein for lowering said support and engaging said valve seat with said forming tool, means for thereafter alter-f nately increasing and decreasing the pressure of engagement comprising a control valve for introducing actuating fluid to said cylinder, a popoi valve communicating with said cylinder, and means for supplying actuating fluid to said control valve through a restricted orifice.

5. Apparatus for finishing valve seats and the like comprising a base, a forming tool supported thereby, a support for a valve seat, means for biasing said support to a limited elevation relative to said base, a cylinder mounted stationary relative to said base, a piston therein for lowering said support and engaging said valve seat with said forming tool, means for thereafter altemately increasing and decreasing the pressure of engagement comprising a control valve for introducing actuating fluid to oi' valve communicating with said cylinder, and means for supplying actuating fluid to said control valve.

6. Apparatus for finishing valve seats and the like comprising a base, a forming tool supported thereby, a cylinder mounted stationary relative to said base, a piston therein for engaging said valve seat with said forming tool, means' for thereafter alternately increasing and decreasing the pressure of engagement comprising a conengagement comprising means for alternately introducing actuating fluid` to, and relieving .it from, `said uid pressure means.

9. In apparatus for finishing valve seats and the like, a base having guideways, a support slidable in said guideways', a second support slidable in said first support, a forming tool mounted on said second support, a third support for a valve seat, said third support being slidable relative to said first support, means for support to a limited elevation relative to said first support, fluid pressure means for engaging a valve seat on said third support and moving it to a position of engagement with said forming tool, means for and decreasing the pressure oi.' engagementcom- -prising a control valve for introducing actuating fluid to, and a. pop-off valve communicating with,

said fluid pressure means and :restricted orifice said fluid means for supplying actuating iluid'to pressure means.

said cylinder, a poptrol valve for introducing actuating fluid to said cylinder, a pop-off valve communicating with said cylinder, and means for supplying actuating fluid to said control valve through a restricted oriilce.

'1. in apparatus for finishing valve seats and the like, a forming tool, a support for a valve seat, fluid pressure means for engaging said valve seat with said forming tool and means for thereafter alternately increasing and decreasing the pressure of engagement comprising a control valve for introducing actuating fluid to said uid pressure means through a restricted orifice and a pop off valve communicating with said fluid pressure means.

8. In apparatus for finishing valve seats and the like, a suppors for a valve seat, fluid pressure means for engaging said valve seat with said forming tool and means for thereafter alternately increasing and decreasing the pressure of said rst support,

10. In apparatus the like, a base having guideways, a support slidable in said guideways, a second support slidable in said first support, a forming topi mounted on said second support, a third support for a valve seat, said third support being said first support, means for biasing said third vsupport to a limited elevation relative to said iirst support, fluid pressure means for engaging a valve seat on said third support and moving it to a position of engagement with said forming tool and means for thereafter alternately increasing and decreasing the pressure of engagement.

ll. In apparatus for finishing valve seats and the like, a base having guideways, a support slidable in said guideways, a second support slidable in said first support, a forming tool mounted on said second support, a third support for a valve seat, said third support being slidable relative to means for biasing said third support to a limited elevation relative to said first support, iiuid pressure means for engaging a valve seat on said third support and moving it to a position of engagement with said forming tool and means for thereafter alternately increasing and decreasing the pressure of engagement comprising a control valve for introducing actuating fluid to, and a pop-oi! valve communicating with, said iiuid pressure means.

WILBERT W.

REDsncrEa.

biasing said third.

thereafter alternately increasing for finishing valve seats and slidable relative to