US3721047A - Crush dressing control mechanism - Google Patents

Crush dressing control mechanism Download PDF

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Publication number
US3721047A
US3721047A US00159941A US3721047DA US3721047A US 3721047 A US3721047 A US 3721047A US 00159941 A US00159941 A US 00159941A US 3721047D A US3721047D A US 3721047DA US 3721047 A US3721047 A US 3721047A
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US
United States
Prior art keywords
wheelhead
crush
motion
movement
rod assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00159941A
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English (en)
Inventor
Merle E Ryan
William D Stremel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHEFFIELD MACHINE TOOL COMPANY A CORP OF OH
Original Assignee
Bendix Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bendix Corp filed Critical Bendix Corp
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Publication of US3721047A publication Critical patent/US3721047A/en
Assigned to SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH. reassignment SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BENDIX CORPORATION THE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
    • B23Q16/005—Equipment for measuring the contacting force or the distance before contacting between two members during the positioning operation

Definitions

  • ABSTRACT A mechanism for controlling the infeed point at which the crush dressing sequence occurs for grinding machines including a position referencing rod slidably fitted in a base with a friction snubbing means preventing free motion therein and positioned by a driving engagement with the wheelhead during infeed motion, and an arrangement producing reduction of the wheelhead infeed to the crush feed rate after a predetermined extent of relative motion therebetween, combined with a spring biased pin slidable in the base and fixed during crush cycling, and controlling the depth of crush by an agreement which discontinues the low speed traverse after a predetermined extent of relative motion between the wheelhead and the pin, thereafter the pin being relocated on a plate carried by the position referencing rod.
  • the wheelhead returns to the point of the previous crush cycle at a rapid traverse infeed while the crush depth of each cycle remains the same.
  • the wheelhead is moved forward in a two-stage motion in that it is rapid traversed until reaching the vicinity of the crush rollers, and then slowly advanced into rolls while being rotated.
  • the grinding wheel is worn down by successive crush dressings, it would be advantageous to shift inwardly the point at which rapid traverse is discontinued, as excessive machine time would be wasted infeeding the wheelhead at the slow crushing rates through the distance corresponding to the previously removed grinding wheel material.
  • the relatively high mass crush depth control assembly required a relatively heavy slide block,-as in the process of relocating this assembly against the slide block, shifting of the block due to impacts therewith could occur leading to loss of correspondence between the maximum infeed point of the grinding wheel and the slide block.
  • this arrangement required the precision adjustment means to be carried by the moving crush control assembly increasing the mass of the assembly and subjecting the adjustment mechanism to impacting upon relocation with the slide block.
  • the mounting of the assembly is rendered relatively complex by the arrangemerit in which indirect contact between the wheelhead and the crush control assembly is used to trigger the cycle end.
  • the crush control mechanism 10 includes a position referencing assembly 12 fixed to the machine base 14, a control switch assembly 16 fixed to the machine wheelhead structure 18, and a contact assembly 20,
  • the position referencing assembly 12 includes a position referencing rod assembly 21 including a rod member 22 slidably mounted within a bore in a fixed housing 24.
  • Assembly 21 also includes a plate 26 affixed to one end of the rod 22, supported for sliding movement in a groove 28.
  • Movement of the rod 22 in the bore is frictionally snubbed by means of an adjustable drag element 30 (FIG. 3) which is threaded into a release knob 32 in turn threaded into a boss 33.
  • the drag element 30 is maintained in an adjusted position therein by means of a locking member 34 also threaded into the release knob 32.
  • a pin element 36 is also slidably disposed in the housing 24 and passes through an opening 38 in plate 26.
  • Switch assembly 16 controls the transition of the wheelhead 18 infeed motion from the initial mode of a rapid traverse called for by the automatic controls (not shown) to the second mode of a slow crush infeed speed. This is accomplished by the use of a rocker cam 50 rotatably mounted to a bracket 52 fixed to the wheelhead 18 and having a pair of adjustable actuating bolts 54, 56 threaded through the upper portion of the rocker cam 50.
  • the actuating bolts 54, 56 are disposed opposite a pair of switches 58, 60, respectively, which control electro-operated a pair of valves (not shown) which in turn control fluid flow to the wheelhead infeed actuator such that upon actuation of one valve, the infeed rate is reduced to slower precrush traverse and upon actuation of the other valve the infeed rate is reduced further to the crush infeed rate.
  • the rocker cam 50 is rotated by engagement with cam surface 66 on the plate 26 after a predetermined extent of relative motion between the wheelhead 18 and the rod assembly 21 as the wheelhead moves to the left as viewed in FIGS. 1 and 2.
  • Pin 36 is held stationary by means of the air cylinder 46 and its operating rod 48 so that the spring 40 is compressed by the leftward movement of the plate 26 and relative movement occurs between the wheelhead structure 18 and the pin.
  • the air cylinder Upon completion of the timed interval, the air cylinder is deactivated to again lock the pin 36, and
  • the grinding wheel is retracted to its normal operating position at rapid traverse rate.
  • the plate 26 will be positioned to the left precisely to the extent of the crushing depth of the previous cycle so that the wheelhead 18 will be rapid traversed correspondingly further before the transition to the slow speed crush sequence is initiated, while the crush depth remains exactly the same by virtue of the relocation of the pin 36 to the rod assembly 21 at the end of the previous forward motion cycle.
  • An improved arrangement for controlling the motion of a grinding machine wheelhead structure of the type that includes means for infeeding the grinding wheel into engagement with a dressing mechanism initially at a rapid traverse rate and then a slower dressing rate as the dresser mechanism is approached, the arrangement including:
  • a rod assembly including a rod supported for a sliding motion in a base
  • said means including:
  • an element disposed to be drivingly contacted by said drivingly engaged wheelhead and rod assembly after a predetermined extent of relative movement between said element and said wheelhead and also including locator means fixing said element during cycling movement of said wheelhead but moving said element to be located by said rod assembly position in response to said discontinuance of said forward cycle motion, whereby the extent of said rapid traverse modal movement increases after each cycle but the extent of said slow rate modal movement remains constant.
  • locator means includes means biasing said element into driving engagement with said rod assembly and means releasing said element when said forward motion is discontinued and before said return motion occurs.
  • adjustment means is carried by said wheelhead for varying the extent of said predetermined movement causing said discontinuance of forward motion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US00159941A 1971-07-06 1971-07-06 Crush dressing control mechanism Expired - Lifetime US3721047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15994171A 1971-07-06 1971-07-06

Publications (1)

Publication Number Publication Date
US3721047A true US3721047A (en) 1973-03-20

Family

ID=22574765

Family Applications (1)

Application Number Title Priority Date Filing Date
US00159941A Expired - Lifetime US3721047A (en) 1971-07-06 1971-07-06 Crush dressing control mechanism

Country Status (6)

Country Link
US (1) US3721047A (it)
JP (1) JPS5813304B1 (it)
CA (1) CA966666A (it)
DE (1) DE2233015C2 (it)
GB (1) GB1340658A (it)
IT (1) IT962389B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3828477A (en) * 1973-05-07 1974-08-13 Bendix Corp Closed loop grinder infeed control system w/automatic compensation for wheel diameter changes due to dressing operations
US3885353A (en) * 1972-10-28 1975-05-27 Toyoda Machine Works Ltd Grinding machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388325B (de) * 1983-05-16 1989-06-12 Sticht Walter Verfahren und vorrichtung zum stufenlosen positionieren von maschinenteilen
JPS6125413U (ja) * 1984-07-20 1986-02-15 積水ハウス株式会社 外壁パネルの受金具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097429A (en) * 1937-01-13 1937-11-02 Heald Machine Co Grinding machine
US2969625A (en) * 1959-01-09 1961-01-31 Landis Tool Co Control actuating means for machine element having a variable zone of movement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3006332A (en) * 1958-10-10 1961-10-31 Norton Co Powered rotary truing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2097429A (en) * 1937-01-13 1937-11-02 Heald Machine Co Grinding machine
US2969625A (en) * 1959-01-09 1961-01-31 Landis Tool Co Control actuating means for machine element having a variable zone of movement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885353A (en) * 1972-10-28 1975-05-27 Toyoda Machine Works Ltd Grinding machine
US3828477A (en) * 1973-05-07 1974-08-13 Bendix Corp Closed loop grinder infeed control system w/automatic compensation for wheel diameter changes due to dressing operations

Also Published As

Publication number Publication date
CA966666A (en) 1975-04-29
DE2233015C2 (de) 1982-04-22
DE2233015A1 (de) 1973-01-18
JPS5813304B1 (it) 1983-03-12
GB1340658A (en) 1973-12-12
IT962389B (it) 1973-12-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SHEFFIELD MACHINE TOOL COMPANY; A CORP OF OH., OHI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BENDIX CORPORATION THE;REEL/FRAME:004044/0681

Effective date: 19820730

Owner name: SHEFFIELD MACHINE TOOL COMPANY; 3913 WILLOW CREEK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BENDIX CORPORATION THE;REEL/FRAME:004044/0681

Effective date: 19820730