US1577478A - Cylinder-grinding attachment - Google Patents

Description

March 23 1926. 1,577,478

L. c. MARBURG' CYLINDES GRINDING ATTACHMENT Filed Feb. 9, 1923 2 Sheets-Sheet 1 IN VEN TOR a z Louis QMamZuwzg A TTORNE Y March 23 1926. 1,577,478

L. 'C. -MARBURG CYLINDER GRINDING ATTACHMENT Filed Feb. 9, 1923 2 Sheets-Sheet 2 IN VEN TOR.

Louis GMarbury BY {5 W W ATTORNEY Fatented Mar. 23, 1926.

LOUIS MARBURG, OF MONTCLAIB, NEW JERSEY, ASSIGNOR OF ONE-HALF TO MAR- BURG BRO'IHERS,v INCL, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK, AND

GIVE-HALF TO MAYER & SCHMIDT, OF OFFENBACH-ON-THE-MAIN, GERMANY, A.

CORPORATION OF GERMANY.

CYLINDER-GRINDING ATTACHMENT.

Application filed February 9, 1923. Serial No. 618,021.

To all whom-it may con-carat:

Be it known that I, LOUIS C. MARBURG, a citizen of the United States, residing in the town of Montclair, county of Essex, and

' State of New Jersey, have invented certain new and useful Improvements in Cylinder- Grinding Attachments, of which the following is a specification, reference being had to the accompanying drawings. a

This invention relates to various features of construction and to the manner in Which the attachment, described herein, may be operated and driven by the main spindles of internal grinding. machines and has for its 315 object the cheap and accurate grinding of face surfaces of cylinders and engine beds, etc.

It has become a widely adopted practice to finish the inside of cylinders or crosshead slides of engine beds on an internal grind:

ing machine. This results in great accuracy as far as the bore of the cylinder and crosshead slides are concerned,- which is highly desirable as it produces greater eiiiciency and increases the life of the cylinder and crosshead slides. The full benefit of this greataccuracy, however, can be taken advantage of only if the cylinder and slides.

are perfectly aligned with each other and with the crankshaft bearings, and in case of tandem arrangement or multi-cylinder en-' gine, with relation to the' other cylinders.

In order to secure such accuratealignment the face surfaces of the cylinders and engine beds must be exactly. at right angle to the axis of cylinder bore and crosshead slides, and within a plane parallel to the axis of the crankshaft. On a boring mill the desired degree of accuracy in this respect is 40 almost impossible and grinding the face surfaces of cylinders and beds, as well as their internal cylindrical surfaces,- is there fore highly desirable.

It has been customary heretofore, if face surfaces, as well as internal cylindrical surfaces had to be ground, to either remove the main grinding arm for cylindrical grinding, after the latter was finished, and toinsertanother grinding arm for end surface 59 grinding, or otherwise remove the .work-.

piece to another machine, which is very apt to cause inaccuracies. Again, complicated, expensive and cumbersome grinding machines have been used in order to'produce both cylindrical and end surface grinding accurately aligned.

The invention described herein, consists of a .llOVOlCOlHblDittlOll for internal grind lug. machines, wherein themain grinding arm, not only supports, as usual, the main grinding spindle for cylindrical grinding, but also may be used for supporting a special attachment for grinding end surfaces of cylinders or engine beds, etc. In my attachment, which contains an auxiliary spindle and a grinding wheel on said spindle, the auxiliary spindle may be-driven, if desired, by belt or chain directly from the main grinding spindle, whereby the design becomes very simple, compact and cheap. The end surface grinding may thus be done, very accurately, directly before or after cylindrical grinding, assuring perfect alignment of the work piece, so that the face surface will be exactly at right angle to the axis of the internally ground cylinder, or

crosshead slides of the engine bed. My invention thus saves a great deal oflabor and secures accurate alignment and finish of the face surfaces, and constitutes great progress particularly in connection with large, workpieces.

Referring now to the drawings, which are attached hereto, Fig. 1 shows a longitudinal section through my face grinding attachment and through part of the main grinding arm,

while the rest of the grinding arm is shown in side view.

The main grinding arm and the specialattachment area shown herein in relation to a non-revolving, stationary engine bed, the crosshead slides, as well as the end face, which are only indicated indotted lines, are to be ground. The internal grinding machine, of which only the end containing my attachment is shown in Fig. 1, is of the universally known planetary type, wherein the main grinding .arm revolves slowly eccentrically around the axis of the cylinder, while the main grinding spindle, which is supported in the arm, rotates at usual high velocity, the axis of the main grinding spindle being eccentric but parallel to the axis of the cylinder. Such grinding machines being generally known and used for internal grinding, it is not necessary to show I or further explain their construction, the

drawing serving only to show the novel feature,,which consists in the'inanner of supporting the face grinding attachment on the main grinding arm and the manner in which the face grinding wheel may be driven from main grinding spindle as well as details of the device which will later on be fully explained.

Fig. 2 shows an end view of my grinding attachment with work-piece removedand front end of grinding arm cut off.

Fig. 3 shows a section through the attachment on line 3-3 of Fig. 2, illustrating how the parts may be assembled.

Fig. 4 shows a side view of a hood and part of a main ,grinding arm and grinding wheel, as well as part of a table, which latter may revolve slowlywhile the main grinding arm may not revolve, as is customary in the more common types of grinding machines, wherein the arm is slowly moving axially inwardly and outwardly While a cylinder (shown in. dotted lines) may be clamped to the revolving table, or held firmly thereon in any known manner, the cylinder revolving slowly with the table.

After internal grinding is finished, one of the faces may be ground by means of my special grinding attachment.

In this case, the work-piece and spindle may be arranged vertically, as shown herein, the arrangement of my face grinding attachment and the drive of the face grinding wheel preferably being indentically the same as shown in Figs. 1 to 3,.except that the work-piece may revolve slowly while the main grinding arm, as stated, does not revolve, the main grinding spindle revolving at usual high velocity and drivingthe face grinding wheel exactly in the manner as shown herein-before.

Referring now more to the details shown in Figs. 1 to 3, where same numerals refer to same parts, the face grinding device consists of a support 2 which is mounted on the main grinding arm 1. The latter may be of circular outer shape and may carry my device on its. peripheral surface and both parts may be secured to each other by means of bolts 3. The arrangement as herein shown includes a slide 4, mounted on or being apart of support 2. 16 may be a bolt and nut, for the purpose of bolting the slide 4 to the support 2. This slide 4 carries bearings 5, a spindle 6, a face grinding wheel'7, pulley 8, and idlers 9 for. belt 10, the arrangement preferably being such that bearings 5 carry the spindle 6 and the latter carries the grinding wheel 7 The slide 4 may be 'bolted, as shown, or attached in known manner to the support 2, at any desired distance from the center of the main spindle, for grinding faces or flanges of slotted way may be provided for the slide 4, whereby the bearings of the face grinding' device may be accurately aligned while the face is being ground. The belt 10, which drives pulley 8, may be driven by pulley 11 being mounted on the main grinding spindle 1-2, which latter is arranged rotatably within the main grinding arm, the main grinding spindle 12 carrying at its outer end the main grinding wheel 13 for internal grinding. Means are provided for supplying sufficient tension on the idlers 9 to keep the belt 10 tight, such means being well known. Instead of a belt, a chain or other known means may be used. The face grinding attachment described may be. mounted on the main grinding arm concentrically or eccentrically as compared with the center of the main grinding arm, as may be desired, this being of secondary importance, but the arrangement is such that when the grinding arm itself revolves or turns, the attachment swings around a circle and the axis of the face grinding wheel may describe a circle around the axis around whiph the grinding arm swings. Simultaneously said face grinding wheel is rotated around its own axis at a high velocity. In this manner, the grinding wheel which finishes the face surface, will cover during each revolution of the slowly revolving grinding arm, a circular surface similar to the face 'jof an engine cylinder or engine bed.

In order to balance the weight of slide, spindle, grinding wheel or other revolving parts, a counterweight 14 may be used.

Fig. 4 has been partly explained hereinbefore and shows the side view of a main grinding arm 1, grinding wheel 13 and .hood 15 of a vertical cylinder grinding ing wheel of my face grinding attachment.

The details of the attachment are preferably identically the same as shown before, and they are therefore not shown herein again. i

As herein shown, the grinding deviceincludes a protectivehood 15., for the protectionof-the Workingman arranged so that it can be; easily-dismounted.

Various modifications. may be made :in

the invention. Without departing. from the means spirit thereof and the nresent exemplilicalion is to be taken as Illustrative and not limitative thereof.

I claim:

1. In a grinding machine, a main grinding arm, a. main rinding spindle being arranged rotative y within said arm, a main grinding wheel on said spindle and being adapted for internal cylindrical grinding, an auxiliary grinding device, consisting of an auxiliary arm, the latter being mounted on said main arm, an auxiliary grinding spindle being arranged rotatively within said auxiliary arm, an auxiliary grinding wheel adapted for face grinding, being mounted on said auxiliary spindle.

2. In a planetary type grinding machine, a main grinding arm, being arranged revolvably, a main grinding spindle being arranged rotatively within said arm, amain grinding wheel on said spindle and being adapted for internal cylindrical grinding, an auxiliary grinding device, consisting of an auxiliary arm, the latter being mounted on said main arm, revolving with the latter, an auxiliary grinding spindle being arranged rotatively within said auxiliary arm, an aux iliary grinding Wheel adapted for face grinding, being mounted on said auxiliary spindle, and means for driving said auxiliary spindle from said main spindle.

3. In an internal grinding machine, a main grinding arm, a main grinding spindle being arranged rotatively within said arm, a main grinding Wheel on said spindle and being adapted for internal cylindrical grinding, an auxiliary grinding device, consisting of an auxiliary arm, the latter being mounted on said main arm, a slide being arranged on said auxiliary arm, a bearing on said slide, an auxiliary spindle being placed rotatively in said bearing, an auxiliary grinding wheel adapted for face grinding, being mounted on said auxiliary spindle.

4. In a planetary type grinding machine, a main grinding arm being revolvable, a main grinding spindle being arranged ro-- tatively within said arm, a main grinding wheel on said spindle'and being adapted for internal cylindrical grinding, an auxiliary grinding device, consisting of an auxiliary arm, the latter being mounted. on said main arm revolving with the latter, a slide being arranged on said auxiliary arm, a'

bearing on said slide, an auxiliary spindle being placed rotatively in said bearing, an auxiliary grinding wheel, adapted for face grinding being mounted on said latter spindle, and means for driving said auxiliary spindle from said main spindle.

5. In a planetary type grinding machine, a main grinding arm being revolvable, a main grinding spindle being arranged rotative- 1y within said arm, a main grinding wheel 011 said spindle and being adapted for internal cylindrical grinding, an auxiliary grinding device, consisting of an auxiliary arm, the latter being mounted on said main arm revolving with the latter, a slide being arranged on said arm, a bearing on said slide, an auxiliary spindle being placed rotatively in said bearing, an auxiliary Wheel adapted forface grinding being mounted on said latter spindle, means for driving said latter spindle and wheel from said main grinding spindle, and means for balancing said revolvin auxiliary device.

LOUIg O. MARBURG.

Images