US2317079A - Honing machine - Google Patents

Description

April 20, 1943. D. T. PEDEN HONING MACHINE Filed April '7, 1941 I INVENTOR 2011 145 T 73 1.

ww mm ORNEYS.

Patented A r. 20, 1943 noNmo MACHINE v Douglas T. Peden, Ann Arbor, Mich., assignor to Micromatic Hone Corporation, Detroit, Mich., a corporation of Michigan Application April 7, 1941, Serial No. 387,157

4 Claims.

My invention relates to honing machines, and particularly to a honing-machine of new and novel construction which finishes a workpiece to accurate dimension while compensating for stone wear, and is a continuation in part of my application, Serial No. 365,526, filed on November 8, 1940.

The machine in the above mentioned application embodied a base on which a table was supported and reciprocated. A spindle was provided for supporting a honing tool for movement in rotation and reciprocation. Means were provided for advancing the abrasive stones of the honing tool into engagement with the wall of the workpiece, after which the abrasive stones were further progressively expanded during the machining operation to a predetermined diameter. During the machining operation stone wear occurs, and this was compensated for when the stones were contracted so as to return them to a position to have the diameter of the tool the same as at the beginning of the operation. It will be seen that, when starting on a honing operation with the stones set in a predetermined diameter,

movement to a desired diameter during a honing operation can be set to compensate for the wear of the stones which will occur during thev operation. As pointed out above, this wear is compensated for upon the collapse of abrasive stones so that they are returned to a position to provide the same diameter as that of the tool at the beginning of the operation.

movement of the piston by the stones when fur-' ther pressure is applied thereto when further expanded; and, in general, to provide a method and means for locking 9, piston in position when moved longitudinally of its length which are positive in operation and economical of manufacture.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figure 1 is a broken sectional view of a spindle and tool embodying features of my invention;

Fig. 2 is a sectional view of the structure illustrated in Fig. 1, taken on the line 2--2 thereof;

Fig. 3 is a plan view of the locking mechanism Q illustrated in Fig, 1 in unlocked position; and

My present invention relates to an improvement on that illustrated and described in my above mentioned copending application. An element is actuated by the piston as it advances the stones to engage the cylinder wall to positively lock the tool against a tendency to actuate the piston. The mechanism for expanding the stones thereafter, compensating for stone wear when retracting the stones, and the controls therefor, are the same as that referred to in the above mentioned copending application.

Accordingly, the main objects of my invention are: to provide a spindle for supporting and driving a honing tool which has means for locking certain parts thereof when the tool is in initially expanded position; to initially expand a honing tool into contact with the wall of a cylinder and lock the initially expanding means against retroactive movement and thereafter further feed the tool a predetermined progressive amount as the honing operation progresses; to expand a honing tool by a piston which rotates a pin in a sleeve to lock the piston and prevent a retroactive Fig. 4 is a view of the structure illustrated in Fig. 3, with the parts in locked position.

In Fig. l, I have illustrated a spindle I0 com prising a sleeve l I mounted in a supporting housing l2. The sleeve ll supports a sleeve l3 in which a tubular element It is mounted for rotational and reciprocal movement by a shaft l5 which is secured thereto by a rivet It. The tubular element M has a portion II which functions as a cylindner for operating a piston l8 to move the piston axially therewithin. The piston has a plunger I! mounted on its forward end from which a pin 2| extends within slots 22 in an encompassing sleeve 23.

The plunger I9 contains a central aperture 24, the wall thereabout having a pair of diagonally disposed, oppositely directed slots 25 through which a pin 26 extends. The pin projects through a pair of slots 21 in the sleeve 23, a portion 28,

or which is angularly disposed relative to the axis of the sleeve, while a portion 28 15 disposed at right angles thereto. The ends of the'pin 26 project into apertures in a ball race 3| which is turned thereby and which is advanced parallel to the movement of the plunger 24. An external race portion 33 is joined to the portion 3| by balls 34 so that the race portion 33 reciprocates therewith.

The race portion 33 is extended to provide sleeve portion 35 containing internal threads.

36 and journals 3! for supporting the projecting ends 38 of a plurality of pinions 39 which extend through slots in the sleeve portion 35. The pinions engage gear teeth 4| on an exterior ball race 42 the tops of which have a thread engaged by the thread 38 of the sleeve portion 15. An

internal raceway 43 is joined to the raceway 42 by a plurality of balls 44 secured in thrust relation by a sleeve 45. The raceway 43 has a pin 48 projecting therethrough which passes through a slot 41 in the sleeve 23 and through an aperture in a supporting head 48 which receives the head of the adjusting element 49 of the tool 5|.

Inv Fig. 1, I have illustrated the piston I 8 in the left hand end of the cylinder II, in which position the adjusting cone 49 of the tool permits the abrasive stones 5!] to contract. After a workpiece has been mounted in a holder (not shown) and advanced over the tool, fluid is provided to the left hand side of the piston 18 to move the piston to the right and advance the plunger l9 to rotate the pin 26 as it is advanced in the slot portion-28 and thereafter rotated into the slot portion 29. The initial advancement of the pin in the slot portion 28 advances the raceway 3|, the raceway and sleeve portion 33 and 35,

- the raceways 42 and 43, and the pin 46 to thereby advance the head 48 and the adjusting cone 49 to initially move the abrasive stones 50 into engagement with the cylinder wall.

The further movement of the pin 26 in the slot portion 29 provides a mechanical lock to prevent pressure on the adjusting cone 49 from moving the piston to the left. Such pressure may be produced by the further expansion of the stones during the honing operation as the sleeve 52 is rotated to rotate an internal gear, the pinions 39 and the raceway 42 which is advanced t the right by the threads 36. The pin 2! in the plunger I9 operates in the slot 22 in the sleeve 23 and prevents the rotation of the plunger during the advance movement which forces the pin 26 to revolve. After the honing operation, the application of fluid to the piston I8 is reversed for moving the piston and plunger iii to the left, which movement revolves the pin 28 in the slot portion 29 to unlock the plunger and then moves it to the left in the slot 28 which returns the parts to the position as illustrated in Fig. 1. The abrasive elements are then out of contact with the finished surface of the cylinder which may be removed from the Work holder.

It will thus be seen that I have provided a positive lock for the plunger and piston of a honing device which moves the abrasive stones into and out of contact with a cylinder wall. After the stones have been initially advanced, a pin is revolved to lock the piston 'and plunger in fixed position. The stones are thereafter further advanced during the honing operation by mecha nism in addition to the piston and plunger, the latter of which are locked against movement which may otherwise occur from the pressure in built up on the stones by the additional mechanism. The reverse movement of the piston initially releases the lock and retracts the cone which permits the stones to collapse and move out of contact with the finished surface of the 1.", cylinder.

What I claim is:

1. In a .honing device, a plurality of honing stones, an element for expanding said stones, a piston for moving said element for expanding :0 said stones, and means actuated by the movement of said piston for locking said piston against reverse movement by said element.

2. In a honing device, a plurality of honing stones, an element for expanding said stones, a

piston for moving said element for expanding said stones, means actuated by the movement of said piston for locking said piston against reverse movement by said element, and means for thereafter moving said element to further expand said 30 stones without moving said piston.

3. In a honing device. a tool having a plurality of honing stones, mechanism for expanding and contracting said stories, a. piston for moving said mechanism for also expanding and contracting 35 said stones, and mean operated by said piston for locking said piston against movement by said mechanism when'the latter is operated to expand and contract said stones.

4. In a honing device, a tool having a plurality g of honing stones, mechanism for expanding and contracting said stones, a piston for moving portions of said mechanism for also expanding said stones, and means operated by said piston for locking a part of said mechanism for removing 45 pressure from said piston produced by the further expansion of said stones by said mechanism.

DOUGLAS T. PEDEN.v

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