US2930372A

US2930372A - Contour forming apparatus

Info

Publication number: US2930372A
Application number: US698651A
Authority: US
Inventors: Hoglund Nils
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-11-25
Filing date: 1957-11-25
Publication date: 1960-03-29
Anticipated expiration: 1977-03-29

Description

N. HOGLUND CONTOUR FORMING APPARATUS March 29, 1960 ll Sheets-Sheet l Filed Nov. 25, 1957 ww Q A .1

l in? MN Nm r \w =5 W s mm March 29, 1960 N. HOGLUND 2,930,372

- CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 11 Sheets-Sheet 2 INVENTOR. N11. 5 H u 51.1mm

March 29, 1960 HOGLUND 2,930,372

CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 ll Sheets-Sheet 3 r- O I, R\ a INVENTOR.

Nns Husmmn 1 2% &

March 29, 1960 N. HOGLUND CONTOUR FORMING APPARATUS 11 Sweets-Sheet. 4

Filed Nov. 25, 1957 INVEN TOR. NILE Hm 51.1mm

March 29, 1960 N. HOGLUND 2,930,372

CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 11 Sheets-Sheet 5 INVENTOR. NILs Hnsumn March 29, 1960 N. HOGLUND 2,930,372

CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 ll Sheets-Sheet 6 /NVE/VTOR NILs HEIBLUND BY WW4 March 29, 1960 N. HOGLUND 2930,372

v CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 ll Sheets-Sheet 7 INVENTUR NILs HDELUND VMMJ j AT (M5) March 29, 1960 N. HOGLUND 2,930,372

CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 11 Sheets-Sheet 8 INVENTOR. NILE HEIGLUND BY I Marh 29, 1960 N. HOGLUND I 2, 0,

CONTOUR FORMING APPARATUS Filed Nov. 25, 1957 11 Sheets-Sheet 9 F \\\\kzj y T//// //M INVENTOR. 6 I N11: Hu sum:

March 29, 1960 N. HOGLUND 0 3 CONTOUR FORMING APPARATUS 7 Filed Nov. 25, 1957 11 She'ts-Sheet 11 INVENTOR. NILS HEIELUND United States Patent CONTOUR FDRMING APPARATUS Nils Hoglund, Summit, NJ.

Application November 25, 1957, Serial No. 698,651

A 14 Claims. (Cl. 12'511) My invention relates to contour forming apparatus, more particularly to grinding wheel dressing apparatus, and one which is particularly useful with vertical grinders.

It is desirable to be able to mount a dressing mechanism directly on the grinding wheel apparatus and leave it in place during grinding operations. This poses the problem of retracting the dressing mechanism during the grinding operations.

Many grinding wheel profiles or contours require accuracies of .0001", steep aswell as horizontal angles and in any profile large enough for a diamond to enter.

It is also desirable to have a dressing apparatus in which the dressing tool or diamond can be moved in toward the wheel being dressed, without moving the entire dresser mechanism including the housing and enclosed slides.

It'is also desirable to have manual or automatic infeeding of the dresser tool by small increments prior to and while the wheel is being dressed and to compensate for wheel wear between dressing operations. Automatic infeeding results in higher production. v

It is an object of my invention to provide a grinding wheel dressing apparatus which can be mounted directly on the grinding wheel apparatus and yet be quickly and easily retracted automatically during grinding wheel operations.

Another object of my invention is to provide such an apparatus which is extremely accurate and which is capable of forming and dressing complex contours.

A further object of my invention is to provide such an apparatus in which only the dressing tool needs to be fed in toward the axis of the wheel being dressed without also requiring the housing to be so moved.

A still further object of my invention is to provide such an apparatus in which the infeeding of the dresser tool can be done automatically or manually to dress the grinding wheel and to compensate for grinding wheel wear.

To accomplish the above objects a dresser made according to my invention is provided with a base which can be attached to a grinding wheel apparatus. This base is provided with an inner or sub-slide carrying a cam follower, the slide being attached to a hydraulically operated piston to move the slide. The housing carrying the dressing tool to slidably mounted on the base for movement parallel to the axis of the wheel being dressed. Mounted within the housing are the various slides for controlling movement of the housing and of the dressing tool. The follower in the sub-slide is in contact With a feed cam on the main slide in the housing so that upon movement of the sub-slide the entire housing can be moved. Also, in accordance with my invention, atool carrying slide mechanism is mounted at one end of the housing and is capable of moving radially of the wheel being dressed without movement of the housing and its other slides. The tool slide mechanism comprises a pair of slides one of which carries the dressing tool. The

2,930,312 Patented Mar. 29, 1960 other slide is coupled to the tool slide by means of a feed screw arrangement which is operated by a pawl and ratchet mechanism for causing infeed of the dressing tool by small increments for each pass of the tool across the grinding wheel being dressed. The other slides within the housing include the main slide carrying the feed cam and contour cam and the contour slide supporting followers connecting the contour cam and a ratio camon one of the tool slides. causes movement of the housing relative to the base, and movement of the contour slide which controls movement of a pair of slides to which the dressing tool is attached.

The invention is described in greater detail in connection with the accompanying sheets of drawings, wherein:

Figure 1 is a side elevation in perspective of an apparatus made according to my invention;

Figure 2 is anopposite side elevation of Fig. l with one of the covers removed to show details of the main' slide, contour cam and contour slide;

Figures 3a, 3b and 3c is a front elevation with covers removed to show details of construction;

Figures 4a, 4b and 40 show a section taken along the line 4-4 of Figures 3a, 3b and 3c; with the bottom cover removed; 1

Figures 5a and 5b show a section taken along the line 5-5 of Figures 4b and 4c;

Figures 6a and 6b are a section looking up along the line 6-6 of Figure 4a;

Figure 7 is a section taken along the line 7-7 of Figure 6a;

. Figure 8 is a section taken along the line 8-8 of Figure 6a; and

' Figure 9 is a schematic showing the dressing tool and grinding wheel in dressing relationship. 1 GENERAL DESCRIPTION Referring to Figures 1 and 2, apparatus made according to my invention includes a'base 20 which can be' attached to the grinding apparatus adjacent the grinding turn, controls a dressing tool which is moved transversely of the movement of the housing. 'These two movements determine the path of travel of the dressing tool across the surface of the grinding wheel.

The housing 21 is provided with a lower portion 21' having a cover 21". Slidably mounted in this portion of the housing is the contour slide 26 which cooperates with the contour cam 25 in a manner to be described for controlling the movement of the dressing tool assern-- bly (not shown-, in Figures 1 and 2) slidably mounted in the lower housing 27. The tool slide assembly moves transversely of the

housing

21, 21, 27.

Mounted within the lower housing is a pair of slides to be described, one of which carries the tool support assembly 28, and the infeed mechanism assembly 29 to be described. 3

Briefly, in operation, when hydraulically operated pi'ston 24 is actuated, it causes the slide 23 to move {back' and forth within the housing 21. The feed cam controls movement of the housing up and down to feed the dressing tool parallel to the axis of the wheel being dressed. At the same time the contour slide 26 connected to contour cam 25 through mechanism to "be described causes the tool :slide assembly to move Movement of the main slide 3 radially of the grinding wheel axis. Thus, the dressing tool follows a contour which is formed on the grinding wheel surface.

HOUSING AND BASE ASSEMBLIES (Figs. 3a, b, c, 4b, c, and 5a, 5b)

Mounted on and within the base are means for initially positioning the housing 21 and for moving the housing bodily to retract the dressing tool when the grinding apparatus is in operation.

The base 20 has slidably mounted therein the stop slide which can be positioned by means of the adjusting screw 36 rotatably mounted in the base 20. This slide carries switch 37 which is used to electrically control the source of fluid under pressure for operating the hydraulically energized cylinder 38 mounted on base 20. Slidably mounted on the base 20 by means of bearing

assemblies

39 and 39 is the sub slide 39 carrying the feed cam follower 40. Slide 39 is connected to the cylinder 38 by means of bracket 41 and piston rod 42, the bracket carrying the tripper 43 for operating switch 37. It will be seen that adjustment of screw 36 and slide 35 determines the limit of the downward movement of sub slide 39 and that operation of cylinder 38 and piston will cause movement of the slide 39 away from and toward the stop slide 35. It will become clear that this arrangement controls the position of the housing initially and at other times as well.

The housing 21, 21' is provided with covers 22 and 22' and is slidably mounted on the base 20 by means of bearing assemblies 30 and 30' and is provided with counter balancing springs 45. The main slide 23 slidably mounted in bearing

assemblies

46 and 47 carries the contour cam 25 and the feed cam 48. The cam 48 and the follower 40 are maintained in contact by. the

weight of the housing and its assemblies, the counter balancing springs neutralizing some of the effective force between cam 48 and follower 40.

The piston 24 is connected to slide 23 by means of the bracket 50 and piston rod 51. Mounted on the slide 23 are the

dogs

52, 53 for operating micro switches 54 and 55 to electrically control the limit of movement of slide 23 by controlling the solenoids (not shown) for operating the valves (not shown) which in turn control the flow of fluid under pressure to the cylinder 24. As the slide 23 is moved back and forth, the housing and all assemblies therein move up and down sincefeed cam 48 is of triangular shape; and follower 40 is in effect stationary on base 20 during dressing operations.

TOOL SLIDE ASSEMBLIES (Figs. 2, 3a, b and 0, 4a, b and c, 6 and 7') As pointed out above, the tool' slide assemblies are mounted within the lower housing 27 and have transverse movement relative to the movement of the housing 21, 21'.

Means are provided for feeding the tool across the wheel to be dressed and then after each pass to feed the tool in by a small increment for the next pass. This is accomplished by means of a pair of slides one of which is connected to and operated by the contour cam on the main slide. The other slide operatively connected to the one slide has additional mechanism for accomplishing the step by step infeed.

Slidably mounted within the lower housing 27 are the slides and 61 mounted in the

ball bearing assemblies

62, 63 and 64, 65; The ratio cam slide 60,. carries the triangularly shaped ratio cam 66 and slide 61 carries, the. dressing tool 67 by means of bracket 68.

The infeed mechanism 29 is mounted on slide 60 by means of bracket 70.

Slides

60 and 61 are positively coupled together by means of infeed screw 71 received within thejrecess 61' of the slide 61, carried by. bracket 7.0 and screw receiving member 72 carried by and fastencd to slide 61. Nut 71' and spring 71" keep screw 71 and member 72 in close contact to prevent backlash. Thus, if slide 60 is moved, slide 61 must move with slide 60. It is also apparent that if screw 71 is rotated there will be relative movement between

slides

60 and 61 so that if slide 60 is moved the cut of the dressing tool for each pass of the tool 67 would be varied.

Boots

73 and 74 are provided to protect the slides from dust.

CONTOUR CONTROL (Figures 3a, b and c, 4a and 12, 6a and b) As the housing 21 is moved up and down (the ap paratus need not necessarily be so positioned) to move the tool 67 across the face being dressed, the tool must be moved in and out relative to the wheel surface being dressed to obtain the proper contour.

Slidably mounted within the housing 21 is the contour slide 26 slidably supported in ball bearing assemblies and 81. Mounted at the upper end of the slide 26 is the follower 82 contacting the contour cam 25. The cam 25 and follower 82 are urged into contact by biasing spring 83 connected between housing 21 and slide 26. At the lower end of slide 26 is supported the cam follower 84 which is in contact with the ratio cam 66. The loading or biasing spring 85 connected between slide 60 and housing 27 maintains ratio cam 66 and follower 84 in contact. As slide 26 moves down, slides 60 and 61 will move to the right (Figs. 4a and 4b) since cam 66 is triangularly shaped, that is, the tool 67 moves into the surface of the grinding wheel.

INFEED INDEXING MECHANISM (Figs. 4a, 6a and b, and 8) I provide means for automatically feeding in the dressing tool as the contour in the grinding wheel is formed. This can be done manually as well as automatically. The feed screw 71 is provided with a shank rotatably supported in the bracket 7 0 mounted on slide 60. The outer end is provided with a square head 91 to which and adjusting handle 92 can be attached for manual adjustment.

Other means are provided for automatic infeed. On shank 90 attached thereto is the ratchet 93. A slide 94 has mounted thereon a pawl 95 operated by hydraulically energized piston 96 connected to slide 94 by means of piston rod 97. This piston is electrically controlled by circuits not shown to rotate screw 71 and advance.

slide 61 a predetermined distance after each pass.

Having described my-invention, what is claimed is: 1. Apparatus for forming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent each other andhaving parallel and relative movement with respect to each other, a dressing tool mounted on one of said pair of slides, one of said slides rotatably supporting an adjusting screw, connections between said screw and the other of said slides whereby rotation of said screw causes relative movement of said slides, means supported within said housing and connected to one of said slides for causing simultaneous movement of said pair of slides, indexing means carried by said housing and connected to said screw, and means for operating said indexing means to cause step-by-step relative movement between said pair of slides to advance said tool, hydraulically operated means within said housing and connected to said base and to said pair of slides for causing movement of said housing in said one direction and simul: taneous movement of'said slides, and means on said base and connected to said housing for moving said housing independently of themeans within said. housing and with...

'out causing movement of said pair of slides relative to said housing. y

2. Apparatus forforming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent each other and having parallel and relative movement with respect to each other and transversely of said hOUS',

ing, a dressing tool mounted on one of said slides, a feed 'mounted on-said base for movement in one direction,

afollower on said base, a pair of slides mounted on said housing and movable parallel to each other and transversely of the movement of said housing, a dressing tool mounted on one of said slides, means connected between said slides for causing relative movement of said slides, said means including a feed screw rotatably mounted on one of said pair of slides and an internally threaded means mounted on the other of said pair of slides and receiving one end of said feed screw, and indexing means for causing relative movement of said pair of slides insteps of small dimensions for advancing said tool, saidy-indexing means including a ratchet con-' nected to said feed screw and a pawl connected thereto, and means for operating said pawl, slide means in said housing and connected between said pair of slides and said follower, and means connected to said slide means within said housing for causing movement of said housing in said one direction and said pair of slides transversely thereof.

'4, Apparatus for forming and dressing contours on a grinding wheel including a base, a sub slide on said base movable along one path, a housing slidably mounted on said base for movement along said one path, connections between said sub slide and said housing for moving said housing upon movement of said sub slide, a pair of slides mounted on said housing and movable parallel to each other, a dressing tool mounted on one of said slides, means connected between said slides for causing relative movement of said slides, said means including a feed screw rotatably mounted on one of said pair of slides and a non-rotatable nut mounted on the other of said pair of, slides and receiving one end of said feed. screw, and indexing means connected to said last means for causing relative movement of said pair of slides in steps of small dimensions for advancing said dressing tool, said indexing means including a ratchet connected to said feed screw and a pawl'connected thereto, and autoniatic means for operating said pawl; slide meansin said housing and connected between said pair of slides and said sub slide, and means connected to said slide means for causing movement of said housing and said pair of slides while said sub slide remains stationary.

5. Apparatus for forming and dressing contours on a grinding wheel including a base, a sub slide on said base, a housing slidably mounted on said base for movement in one direction, connections between said sub slide and said housing for moving said housing upon movement of said sub slide, a pair of slides mounted on said housing and movable parallel to each other and transversely of the movement of said housing, a dressing tool mounted on one of said slides, means connected between said slides for causing relative movement of said slides, and indexing means connected to said last means for causing '6 relative movement of said pair of slides for advancing said dressing tool, slide means in said housing connected between said pair of slides and said sub slide, and means connected to said slide means within said housing for causing movement of said housing and said pair of slides.

6. Apparatus for forming and dressing contours on a grinding-wheel including a base, a housing slidably mounted on said base for movement in one direction, a pair of slides mounted on said housing and movable parallel to each other and transversely of said housing, a dressing tool mounted on one of said slides, means connected between said slides, for causing relative movement of said slides, and indexing means connected to said last means for causing relative movement of said pair of slides in steps of small dimensions, slide means inv said housing and connected to said pair of slides, means on said base and connected to said slide means in said housing to control the movement of said housing, and means connected to said slide means for causing movement of said housing and said pair of slides.

7. Apparatus for forming and dressing contours on main slide, a pair of slides mounted in and movable able transversely of the movement of said housing, a feed 1 transversely of the movement of said housing, a dressing tool mounted on one of said slides, a ratio cam mounted on one of said pair of slides, a rotatable feed screw supportedon one of said pair of slides, means on the other of said pair of slides for receiving said feed screwand means for rotating said feed screw to cause relative movement of said pair of slides to advance said tool,

a ratio slide in said housing, said ratio slide having followers at the ends thereof, one of said last followers contacting said contour cam and the other of said followers contacting said ratio cam for controlling simultaneous movement of said pair of slides, means for moving said main slide to move said housing in said one direction andsaid pair of slides transversely thereto.

8."Apparatus for forming and dressing contours on grinding wheels including a base, a sub-slide on said base, a follower ;on said sub slide, hydraulically operated means connected to said sub slide to move the same along said base, a housing slidably mounted on said base and movable in one direction, a main slide in said housing movc'am on one side of said main slide and contacting said follower, a contour cam on the other side of said main slide, said housing having a portion at one end extending transversely of the housing, a pair of slides in said portion movable transversely of the movement of said housing, a dressing tool mounted on one of said slides, a ratio cam mounted on one of said pair of slides, a rotatable adjusting screw supported on one of said pair of slides and a non-rotatable receiving member on the other of said pair of slides, said screw being received Within said receiving member, means for rotating said screw by small increments to cause relative movement of said pair of slides to advance said tool, a ratio slide in said housing, said ratio slide having followers at the ends thereof, one of said last followers contacting said contour cam and the other of said followers contacting said ratio cam, and hydraulically operated means for moving said main slide to move said housing in said one direction and said pair of slides transversely thereto.

9. Apparatus for forming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base for movement in one direction, a pair of slides mounted on said housing and movable parallel to each other and transversely of said housing, a dressing tool mounted on one of said slides, means connected between said slides for causing relative movement of said slides, slide means in said housing and connected to said pair of slides, means on said base and connected to said slide means in said housing to control the movemcnt of said housing, and means connected to said slide means for causing movement of said housing and said pair of slides. V p

10. Apparatus for forming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent eachother and having parallel and relative movement with respect to each other, a dressing tool mounted on one of said pair of slides, one of said slides rotatably supporting an adjusting screw, connections between said screw and the other of said slides whereby rotation of said screw causes relative movement of said slides, means supported within said housing and connected to one of said slides for causing simultaneous movement of said pair of slides, hydraulically operated means on said housing and connected to said base and to said pair of slides for causing movement of said housing in saidone direction and simultaneous movement of said slides, and means on said base and connected to said housing for moving said housing independently of'the means within said housing and without causing movement of said pair of slides relative to said housing.

11. Apparatus for forming contours on a grinding wheel including a base, a sub slide on said base having a follower, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent each vother and having parallel and relative movement with .respect to each other, a dressing tool mounted on one of said pair of slides, one of said pair of slides rotatably supporting an adjusting screw, connections hetweensaid screw and the other of said pair of slides whereby rotation of said screw causes relative movement of said pair of slides, means supported within said housing including a main slide having cams thereon and connected to one of said pair of slides for causing simultaneous movement of said slides, said follower contacting one of said cams, indexing.

means carried by said housing and connected to said screw, and means for operating said indexing means to cause step-by-step relative movement between said pair of slides to advance said tool, hydraulically operated means connected to said main slide for causing movement of said housing in said one direction and simultaneous movement of said slides, and means connected to said sub slide for moving said housing independently of the means within said housing and without causing movement of said pair of slides relative to said housing.

12. Apparatus for forming contours on grinding wheels including a base, a sub slide on said base, a follower on said sub slide, hydraulically operated means connected to said sub slide to move the same along said base, a housing slidably mounted on said base and movable in one direction, a main slide in said housing movable transversely of the movement of said housing, a feed cam on one side of said main slide and contacting said follower,

a contour cam on the other side of said main slide, said housing having a portion at one end extending transversely of the housing, a pair of slides in said portion movable transversely of the movement of said housing, a dressing tool mounted on one of said slides, a ratio cam mounted on one of said pair of slides, a rotatable adjusting screw supported on said one of said pair of slides, and connections between the other of said slides and said screw and means for rotating said screw by small increments to cause relative movement of said pair of slides to advance said tool, a ratio slide in said housing, said ratio slide having followers at the ends thereof, one of said last followers contacting said contour cam and the other of said followers contacting said ratio cam, and hydraulically operated means for moving said main slide to move said housing in said one direction and said pair of slides simultaneously transversely thereto, dogs on said main slide, and limit control switches mounted adjacent said main slide and positioned to be operated by said dogs.

13. Apparatus for forming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent each other and having parallel and relative movement with respect to each other, a dressing tool mounted on one of said pair of slides, one of said slides rotatably supporting an adjusting screw, connections between said screw and the other of said slides whereby rotation of said screw causes relative movement of said slides, means 1 supported within said housing and connected to one of said slides for causing simultaneous movement of said pair of slides, means mounted on said housing and connected to said means within the housing for causing movement of said housing in said one direction and simultaneous movement of said slides, and means on said base and connected to said housing for moving said housing independently of the means within said housing and without causing movement of said pair of slides relative to said housing. a

14. Apparatus for forming and dressing contours on a grinding wheel including a base, a housing slidably mounted on said base and having movement in one direction, a pair of slides mounted in said housing adjacent each other and having parallel and relative movement with respect to each other, a dressing tool mounted on one of said slides, one of said pair of slides rotatably supporting an adjusting screw, connections between said screw and the other of said pair of slides whereby rotation of said screw causes relative movement of said slides, means supported within said housing and connected to one of said pair of slides for causing simultaneous movement of said slides, said means within said housing supporting a feed cam, and a follower on said base contacting said feed cam for controlling movement of said housing and slides.

References Cited in the file of this patent UNITED STATES PATENTS 2,190,132 Alvord Feb. 13, 1940