US3812761A - Gear hobbing machines - Google Patents

Gear hobbing machines Download PDF

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Publication number
US3812761A
US3812761A US00250042A US25004272A US3812761A US 3812761 A US3812761 A US 3812761A US 00250042 A US00250042 A US 00250042A US 25004272 A US25004272 A US 25004272A US 3812761 A US3812761 A US 3812761A
Authority
US
United States
Prior art keywords
check valve
slide
advance
hob
valve
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
US00250042A
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English (en)
Inventor
C Southworth
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.)
Machine Tool Divisional Services Ltd
Original Assignee
Machine Tool Divisional Services Ltd
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 Machine Tool Divisional Services Ltd filed Critical Machine Tool Divisional Services Ltd
Application granted granted Critical
Publication of US3812761A publication Critical patent/US3812761A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F1/00—Making gear teeth by tools of which the profile matches the profile of the required surface
    • B23F1/06—Making gear teeth by tools of which the profile matches the profile of the required surface by milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F5/00—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made
    • B23F5/20—Making straight gear teeth involving moving a tool relatively to a workpiece with a rolling-off or an enveloping motion with respect to the gear teeth to be made by milling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/10—Gear cutting
    • Y10T409/101431—Gear tooth shape generating
    • Y10T409/10159—Hobbing
    • Y10T409/102226—Hobbing with control means energized in response to activator stimulated by condition sensor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/10—Gear cutting
    • Y10T409/101431—Gear tooth shape generating
    • Y10T409/10159—Hobbing
    • Y10T409/102544—Hobbing including infeed means
    • Y10T409/103339—Hobbing including infeed means to infeed radially of axis of work rotation
    • Y10T409/103498—Infeed of cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2531—Carriage feed
    • Y10T82/2533—Control

Definitions

  • the invention provides a gear hobbing machine comprising a rotary hob, an infeed slide carrying the hob, a hydraulic piston and cylinder assembly connected to the infeed slide and operable to advance it towards a gear blank to be hobbed, said cylinder and piston assembly discharging liquid during advance of the infeed slide through a normally open pilot operated check valve, a solenoid operated valve which normally permits of application of hydraulic pressure to the pilot of the check valve to maintain the check valve open and a limit switch operable by the infeed slide to actuate the solenoid operated valve to cut off pressure from the pilot of the check valve and thereby to cause closure of the check valve to terminate advance of the infeed slide.
  • FIG. 1 is a side elevation of the machine
  • FIGS. 2A and 2B are sectional views of a pilot operated check valve respectively showing this valve in the closed and in the open position
  • FIG. 3 is a hydraulic circuit diagram and FIG. 4 is an electric circuit diagram.
  • the machine shown in FIG. 1 includes a casing containing an electric motor (not shown) for imparting rotation in conventional fashion to a hob 11 and to a gear blank 12 to be hobbed.
  • the hob 11 is rotatably mounted in an infeed slide 13 which can be advanced towards the gear blank 12 and retracted from it by a pair of hydraulic piston and cylinder assemblies 14 of which, for clarity, one only is shown in FIG. 3.
  • the gear blank 12 is carried by a slide 15 to which vertical movement can be imparted through gearing from the motor driving the hob, in conventional fashion to traverse the rotating gear blank past the rotating hob.
  • liquid under pressure is applied to the left-hand end of the cylinder 16 of the assembly from a pressure inlet 17 through a solenoid operated valve 18.
  • a pilot operated check valve 20 held open by a solenoid operated valve 21, and a flow control valve 23.
  • the flow control valve 23 ensures a steady rateof advance of the infeed slide 13. It is placed downstream of the check valve 20 and the piston 19 is provided with leakproof seals (not shown) to ensure that the infeed slide 13 will remain stationary when arrested in the roughing position as described below.
  • the pilot operated check valve 20 has an inlet 22 connected to the cylinder 16, an outlet 24 connected to tank through the flow control valve 23 and a pilot inlet 25 connected to the valve 21, and it contains a plunger 26 urged by a spring 27 to the position shown in FIG. 2A in which it blocks the flow of liquid from the inlet 22 to the outlet 24.
  • pilot pressure is applied to the inlet 25 a piston 27 is advanced to the position shown in FIG. 2B in which it lifts the plunger 26 off a seat 28 to open the valve 20.
  • the infeed slide 13 carries actuators 29, 30 (FIG. 3) which cooperate respectively with limit switches LS1 and LS2, LS3.
  • the limit switch LS1 is closed by the actuator 29.
  • a circuit is completed between lines L1, L2 to energize a relay R1, which closes a contact CR1 to establish a holding circuit for itself.
  • Energization of the relay R1 moves the valve 18 to the position shown in FIG. 3 to supply liquid under pressure to the left hand end of the cylinder 16 and advance the slide 13.
  • Closure of the contact CR1 also energizes a relay R2, through a normally closed contact LS2A of the limit switch LS2, to cause the valve2l to shift to the position shown in FIG. 3 in which it applies pilot pressure to the check valve 20 to open the valve 20.
  • the actuator 30 contacts the limit switch LS2 to open the contact LS2A, deenergize the relay R2 and cause the valve 21 to assume its other position in which it removes pilot pressure from the check valve 20 and causes the valve 20 to close to arrest the advance of the slide 13.
  • a normally open contact LS2B of the limit switch LS2 is closed to energize a relay R3 to start rotation of the hob l1 and gear bank 12 and to impart vertical movement to the slide 15 to traverse the gear bank past the hob.
  • a limit switch (not shown) is closed to energize a relay thereby causing a switch 31 (FIG.
  • the slide 13 retracts to the position where the limit switch LS1 is made, the slide 15 traverses vertically (either upwards or downwards) to its start of cut position and then the slide 13 advances, with the check valve 20 open, untilit reaches the deadstop 33 for the finishing cut.
  • the check valve 20 may be opened, and the slide 13 allowed to advance to its deadstop 33, when a vertical feed motion of the slide is commenced, in the direction opposite to that on the roughing cut.
  • the machine may then be arranged to perform a climb out at a first cut and a conventional cut at a second cut.
  • a gear hobbing machine comprising a hob, an infeed slide carrying the hob and movable from an initial position to advance the slide and the hob toward a gear blank to positions appropriate for performance by the hob of roughing and finishing cuts, a piston and cylinder assembly connected to the slide to effect advance and retraction thereof, connections between opposite ends of the cylinder of said assembly to pressure and tank, a control valve controlling said connections, a pilot operated check valve interposed in one of said connections, a solenoid operated valve which normally applies pilot pressure to said check valve to maintain the check valve open, means operable at the start of a machine cycle to operate said control valve to admit liquid under pressure to said cylinder in the direction to cause said assembly to advance said slide and discharge liquid through said check valve, a limit switch positioned to be actuated by said slide when it reaches the position corresponding to the roughing cut, means responsive to actuation of said limit switch for causing said solenoid operated valve to remove pilot pressure from said check valve, thereby causing said check valve to close to prevent further advance of
  • a machine as claimed in claim 1 which includes a flow control valve positioned downstream of said check valve in the connection containing said check valve.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
US00250042A 1971-05-04 1972-05-03 Gear hobbing machines Expired - Lifetime US3812761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1296471 1971-05-04

Publications (1)

Publication Number Publication Date
US3812761A true US3812761A (en) 1974-05-28

Family

ID=10014340

Family Applications (1)

Application Number Title Priority Date Filing Date
US00250042A Expired - Lifetime US3812761A (en) 1971-05-04 1972-05-03 Gear hobbing machines

Country Status (6)

Country Link
US (1) US3812761A (enExample)
BE (1) BE783034A (enExample)
FR (1) FR2135594B1 (enExample)
GB (1) GB1322822A (enExample)
IT (1) IT957726B (enExample)
NL (1) NL7205967A (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245938A (en) * 1976-08-20 1981-01-20 Carl Hurth Maschinen- Und Zahnradfabrik Device for positioning a tool carriage
CN107775117A (zh) * 2016-08-30 2018-03-09 天津浩岩科技开发有限公司 一种装夹紧固的齿轮插磨一体机
CN111390297A (zh) * 2020-04-18 2020-07-10 无锡易通精密机械股份有限公司 一种轴承齿圈齿纹的仿形切削设备及加工工艺
CN115007950A (zh) * 2022-06-22 2022-09-06 湖南机电职业技术学院 一种基于复合加工的数控多功能铣磨一体化机床

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2317226A (en) * 1940-08-03 1943-04-20 Ex Cell O Corp Machine tool
US2395544A (en) * 1943-10-20 1946-02-26 Gleason Works Gear grinding machine
US2507725A (en) * 1947-08-12 1950-05-16 Maag Zahnraeder & Maschinen Ag Gear cutting machine
US3448643A (en) * 1966-08-24 1969-06-10 Bardons & Oliver Inc Tool slide control for lathes,cutoff machines and the like
US3683558A (en) * 1970-03-28 1972-08-15 Toyoda Machine Works Ltd Grinding machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2317226A (en) * 1940-08-03 1943-04-20 Ex Cell O Corp Machine tool
US2395544A (en) * 1943-10-20 1946-02-26 Gleason Works Gear grinding machine
US2507725A (en) * 1947-08-12 1950-05-16 Maag Zahnraeder & Maschinen Ag Gear cutting machine
US3448643A (en) * 1966-08-24 1969-06-10 Bardons & Oliver Inc Tool slide control for lathes,cutoff machines and the like
US3683558A (en) * 1970-03-28 1972-08-15 Toyoda Machine Works Ltd Grinding machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245938A (en) * 1976-08-20 1981-01-20 Carl Hurth Maschinen- Und Zahnradfabrik Device for positioning a tool carriage
CN107775117A (zh) * 2016-08-30 2018-03-09 天津浩岩科技开发有限公司 一种装夹紧固的齿轮插磨一体机
CN111390297A (zh) * 2020-04-18 2020-07-10 无锡易通精密机械股份有限公司 一种轴承齿圈齿纹的仿形切削设备及加工工艺
CN111390297B (zh) * 2020-04-18 2024-03-26 无锡易通精密机械股份有限公司 一种轴承齿圈齿纹的仿形切削设备及加工工艺
CN115007950A (zh) * 2022-06-22 2022-09-06 湖南机电职业技术学院 一种基于复合加工的数控多功能铣磨一体化机床

Also Published As

Publication number Publication date
GB1322822A (en) 1973-07-11
FR2135594A1 (enExample) 1972-12-22
FR2135594B1 (enExample) 1973-07-13
IT957726B (it) 1973-10-20
BE783034A (fr) 1972-09-01
NL7205967A (enExample) 1972-11-07

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