US3733867A - Thread rolling machine - Google Patents
Thread rolling machine Download PDFInfo
- Publication number
- US3733867A US3733867A US00225849A US3733867DA US3733867A US 3733867 A US3733867 A US 3733867A US 00225849 A US00225849 A US 00225849A US 3733867D A US3733867D A US 3733867DA US 3733867 A US3733867 A US 3733867A
- Authority
- US
- United States
- Prior art keywords
- die
- thread
- starts
- workpieces
- rotary die
- 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
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H9/00—Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass
- B21H9/02—Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass for screw-rolling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
- B21H3/065—Planetary thread rolling
Definitions
- die has multiple starts of a thread form and workpieces are fed in synchronisrn so that the starting points of threads on successive workpieces gradually moves around the periphery of the die.
- all of the thread starts are used in a sequence so that 34 909 WW ..n9 1 7 23 M 2 m mmhm c "mm L C d sum UHF 1 2 1] 2100 555 [[l.
- Planetary thread rolling machines have been used with a rotary die and a stationary die shoe.
- the workpieces such as bolt blanks, are fed in succession to the entrance end of the stationary shoe and are transported by planetary rolling action between the two dies to roll form a thread thereon.
- the workpiece generally has a single start thread and might be one-half inch pitch diameter, for example.
- the rotary die is generally much larger in diameter, for example, 12 inches in order to spread the load onto a larger surface and to reduce the radius of the die at its contact area with the workpiece.
- the diameter of the die is a function of the pitch diameter of the workpiece for a constant radius stationary die. For the example given above, the ratio of the diameter of the rotary die to that of the workpiece is 24:1.
- an object of the invention is to materially increase die life.
- Another object of the invention is to provide a method of gradually changing the starting position around the periphery of a rotary die.
- Another object of the invention is to provide a thread rolling machine wherein the starting of thread rolling is synchronized with the start of a multiple start thread yet progressively moves around the die.
- Another object of the invention is to provide a planetary thread rolling machine which saves on material in the construction of replacement rotary dies.
- Another object of the invention is to provide a planetary thread rolling machine with many more choices of radial thickness of rotary die to be able to choose one of appropriate thickness to savematerial.
- the invention may be incorporated in a planetary thread rolling machine comprising, a frame, a rotary die rotatable about an axis relative to said frame and having N starts of threads around the periphery thereof, a second die on said frame, a thread form on said second die substantially equal to that on said rotary die, means to rotate said rotary die, means to feed a succession of workpieces to the area between said rotary and second dies, and synchronizing means synchronizing the feeding of workpieces with a spacing S between workpieces where S is a given multiple of the peripheral spacing between thread starts on he rotary die and where the ratio of N/S is other than an integer.
- FIGURE is an isometric view of a machine embodying the invention.
- FIGURE illustrates a machine 11 incorporating the invention.
- This machine has a frame 12 indicated schematically which journals a rotary die spindle 13.
- a rotary die holder 14 is fixed to rotate with the spindle 13.
- a motor 15 is connected by suitable speed reduction linkage I6 to rotate the spindle 13.
- a rotary die 18 is secured by clamps 17 on the rotary die holder 14.
- a second die 19 is mounted fixed on the frame 12. This mounting is provided by a die shoe 20 held in an adjustably fixed manner by advancing screws 21 and retracting screws 22 passing through a fixed frame member 23 and engaging the die shoe 20.
- the rotary die 18 has a multiple start thread form 24 on the outer periphery thereof, which periphery would be cylindrical except for such thread form.
- the stationary die 19 has on the inner generally cylindrical surface thereof a substantially similar multiple start thread form 25. These two thread forms may be adjusted relative to each other by the ad-justing screws 21 and 22 so that successive workpieces 26 may be fed to the area between the dies 18 and 19 at the entrance end 28 of the stationary die 19.
- the second die 19 may extend a suitable distance around the periphery of the rotary die 18, for example, one-sixth, one-fourth or onethird of the distance.
- the rotary die 18 rotates about an axis 30 and feed means 31 is provided to feed successive workpieces 26 to the die entrance end 28.
- This feed means 31 may be a feed chute 32 down which workpieces feed by gravity to the die entrance end 28.
- a feed slide 33 is periodi cally reciprocated along its length to intermittently feed the next workpiece from the chute 32 into the area between the dies.
- Synchronizing means 35 is provided to synchronize the feeding of successive workpieces in accordance with the rotation of the die 18. This synchronizing means 35 accomplishes this by being geared to rotate directly with the spindle 13.
- a bevel ring gear 36 is fixed on the spindle I3 and meshes with a bevel pinion 37 fixed on a cross shaft 38.
- a second cross shaft 39 is parallel to shaft 38 and the outer ends of these shafts carry change gears 40 and 41 respectively.
- Shaft 39 feeds into a right angle 1:1 gear box 42 having an output shaft 43 driving a single lobe cam 44.
- a cam follower lever dS is pivoted at 46 and has a follower roller 47 moved by the cam 44 and has an actuating roller 48 acting on the feed slide 33.
- the motor 15 rotates the rotary die 18.
- the feed means 31 is periodically actuated in timed relation to feed a succession of workpieces 26 to the area between the dies 18 and 19.
- the machine 11 is provided with change gears 40, 41 which are readily accessible, to provide any desired ratio N/S where N is the number of starts of threads around the periphery of the multiple start thread form 24 and where S is the spacing between successive workpieces expressed as a given multiple of the peripheral spacing between thread starts on the rotary die 18.
- N is the number of starts of threads around the periphery of the multiple start thread form 24
- S is the spacing between successive workpieces expressed as a given multiple of the peripheral spacing between thread starts on the rotary die 18.
- the present machine provides a construction and a method of operation to utilize all 24 of the thread starts on such a rotary die 18 by starting workpieces at each one of these 24 thread starts in a particular repetitious sequence.
- the present invention illustrates that it is not necessary to gear the feed cam in integral numbers per revolution of the rotary die and it is, in fact, desirable to throw the machine out of time.
- Table B illustrates the machine and method according to the present invention with the same five columns as listed for Table A. Referring to the first row, if N equals 31 and S equals 6 then the ratio N/S is 31/6. This is an irreducible fraction and, accordingly, the fifth column shows that all 31 thread starts are used.
- the gears 36, 37 might have a ratio of 4:1 and this would be built into the machine. Accordingly, change gears 40, 41 would be selected with a gear ratio of 31:24. The overall ratio would then be 4/1 times 31/24 equals 31/6, the desired ratio.
- Table B shows the there are many more possible combinations available for use than in the rather limited selection of Table A. From observing the fifth column in Table B one will observe that the greatest number of thread starts are used when the ratio N/S is an irreducible fraction. If the ratio can be reduced then the number of thread starts used is less than the total number of starts on the rotary die 18. Such a case is illustrated by the third row where the ratio is 28/6.
- each of the thread starts on the rotary die 18 is used for the start of thread rolling on workpieces in a particular sequence. For example, if the ratio is 26/5 then for 26,000 workpieces threaded, 1,000 are started on each of the 26 different thread starts around the periphery of the rotary die 18. This evenly spreads the wear around the die 18 and greatly increases the die life.
- the large number of possible combinations, as illustrated in Table B, has another advantage of saving material in the construction of the rotary die 18.
- the customer uses the rotary die and stationary die with which the machine was equipped to roll threads on workpieces.
- the dies eventually wear out or break down at the start of a thread and need to be replaced.
- the replacement die must, of course, fit that particular machine.
- a machine might have a nominal outside diameter of the rotary die 18 of 12 inches, for example. This can be varied slightly by a complementary change in thickness of the stationary die 19.
- the diameter of the rotary die 18 is a function of the pitch diameter of the workpiece for a constant radius of the stationary die 19.
- the rotary die holder 14 With a 12 inch nominal outer diameter of rotary die 18, the rotary die holder 14 might have a 7% inch diameter. In order to have a suitable radial thickness of the rotary die 18 for strength purposes, the outside diameter of die 18 might vary from 11 k to 12 k inches.
- a planetary thread rolling machine comprising, a frame,
- synchronizing means synchronizing the feeding of workpieces with a spacing S between workpieces where S is a given multiple of the peripheral spacing between thread starts on the rotary die and where the ratio of N/S is other than an integer.
- N is an integer.
- N is a given plurality
- said thread form on the second die is a multiple start thread form.
- the thread form on the second die is a multiple start thread with the peripheral spacing between starts of threads thereon substantially equal to the peripheral spacing between starts of threads on the rotary die.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
Claims (19)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US22584972A | 1972-02-14 | 1972-02-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3733867A true US3733867A (en) | 1973-05-22 |
Family
ID=22846504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00225849A Expired - Lifetime US3733867A (en) | 1972-02-14 | 1972-02-14 | Thread rolling machine |
Country Status (1)
Country | Link |
---|---|
US (1) | US3733867A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004007110A1 (en) * | 2002-07-17 | 2004-01-22 | S.M.A.R.T. S.R.L. | Method and apparatus for inserting blanks to be threaded in automatic rotary rolling machines |
US20040045332A1 (en) * | 2002-03-26 | 2004-03-11 | Takeshi Sakai | Load measuring system for a thread rolling machine and operating method therefor |
DE102011113250B3 (en) * | 2011-09-13 | 2012-11-15 | Wafios Ag | Profile rolling machine |
CN110586820A (en) * | 2019-10-22 | 2019-12-20 | 海盐天奇标准件股份有限公司 | Thread rolling machine |
US11376651B2 (en) * | 2017-04-10 | 2022-07-05 | Kamax Holding Gmbh & Co. Kg | Floatingly mounted multi-piece rolling tool, and rolling machine |
-
1972
- 1972-02-14 US US00225849A patent/US3733867A/en not_active Expired - Lifetime
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040045332A1 (en) * | 2002-03-26 | 2004-03-11 | Takeshi Sakai | Load measuring system for a thread rolling machine and operating method therefor |
US6912883B2 (en) | 2002-03-26 | 2005-07-05 | Minebea Co., Ltd. | Load measuring system for a thread rolling machine and operating method therefor |
WO2004007110A1 (en) * | 2002-07-17 | 2004-01-22 | S.M.A.R.T. S.R.L. | Method and apparatus for inserting blanks to be threaded in automatic rotary rolling machines |
US20050247093A1 (en) * | 2002-07-17 | 2005-11-10 | Enrico Ghezzi | Method and apparatus for inserting blanks to be threaded in automatic rotary rolling machines |
CN1301164C (en) * | 2002-07-17 | 2007-02-21 | S.M.A.R.T.有限公司 | Method and apparatus for inserting blanks to be threaded in automatic rotary rolling machines |
US7204121B2 (en) | 2002-07-17 | 2007-04-17 | S.M.A.R.T., S.R.L. | Method and apparatus for inserting blanks to be threaded in automatic rotary rolling machines |
DE102011113250B3 (en) * | 2011-09-13 | 2012-11-15 | Wafios Ag | Profile rolling machine |
EP2570206A1 (en) | 2011-09-13 | 2013-03-20 | WAFIOS Aktiengesellschaft | Profile rolling machine |
KR101451825B1 (en) | 2011-09-13 | 2014-10-16 | 바피오스 악티엔게젤샤프트 | Profile Rolling Machine |
US11376651B2 (en) * | 2017-04-10 | 2022-07-05 | Kamax Holding Gmbh & Co. Kg | Floatingly mounted multi-piece rolling tool, and rolling machine |
CN110586820A (en) * | 2019-10-22 | 2019-12-20 | 海盐天奇标准件股份有限公司 | Thread rolling machine |
CN110586820B (en) * | 2019-10-22 | 2020-12-11 | 海盐天奇标准件股份有限公司 | Thread rolling machine |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2715846A (en) | Method of groove forming | |
US3032871A (en) | Method for the cold form generating of cylindrical workpieces | |
US3733867A (en) | Thread rolling machine | |
US4090386A (en) | Method of producing zircaloy tubes | |
US5355706A (en) | Process for the production of a hollow workpiece being profiled at least internally in a straight or helical manner relative to the workpiece axis | |
US1996368A (en) | Automatic multiple spindle machine | |
ES449189A1 (en) | Method and machine for rolling threads or the like | |
US3466910A (en) | Method and machine for blanking ball bearings | |
CN104668412B (en) | Thread rolling machine | |
US3599463A (en) | Gear rolling | |
US2712775A (en) | Machines for manufacturing drills, taps, and other articles | |
US1958105A (en) | Thread grinding machine | |
US2913962A (en) | Gear cutting machine and method and cutter therefor | |
ES392760A1 (en) | Mechanism for radial adjustment of tools in rotary tubular tool holders of shaving machines or the like | |
GB968508A (en) | Improvements in or relating to a machining process by electro-erosion | |
US3695310A (en) | Flechette manufacturing machine | |
CN2068868U (en) | Threading roller | |
US2875661A (en) | Machines for machining helicoid-shaped pieces | |
GB1437645A (en) | Apparatus for simultaneously rolling screwthread and gear-tooth profiles on screw thread rolling machines | |
US2069098A (en) | Metalworking machine | |
US2932996A (en) | Thread rolling machine | |
US1832507A (en) | Machine for profiling gear teeth | |
US3845649A (en) | Tube production | |
US3808623A (en) | End working machine tool | |
US3159856A (en) | Apparatus for simultaneously thread rolling the shank and cutting threads on the point of a screw blank |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: PRUTTON CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LITTON INDUSTRIAL PRODUCTS, INC.,;REEL/FRAME:003887/0422 Effective date: 19810630 Owner name: PRUTTON CORPORATION, A CORP. OF OHIO Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LITTON INDUSTRIAL PRODUCTS, INC.,;REEL/FRAME:003887/0422 Effective date: 19810630 |
|
AS | Assignment |
Owner name: LITTON INDUSTRIAL PRODUCTS, INC. A CORP.OF, DELAWA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PRUTTON CORPORATION;REEL/FRAME:003927/0799 Effective date: 19811005 Owner name: LITTON INDUSTRIAL PRODUCTS, INC. A CORP.OF DE. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PRUTTON CORPORATION;REEL/FRAME:003927/0799 Effective date: 19811005 |
|
AS | Assignment |
Owner name: QUAMCO, INC., 100 CONSTITUTION PLAZA, SUTE 1560, H Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LITTON INDUSTRIAL PRODUCTS, INC. A DE CORP.;REEL/FRAME:004324/0546 Effective date: 19841026 |
|
AS | Assignment |
Owner name: LITTON INDUSTRIAL PRODUCTS, INC., 360 NORTH CRESCE Free format text: SECURITY INTEREST;ASSIGNOR:QUAMCO, INC.;REEL/FRAME:004342/0219 Effective date: 19841026 |
|
AS | Assignment |
Owner name: LITTON INDUSTRIAL AUTOMATION SYSTEMS, INC. Free format text: MERGER;ASSIGNORS:KIMBALL SYSTEMS, INC.;LITTON INDUSTRIAL PRODUCTS INC.;LITTON DATAMEDIX, INC.;REEL/FRAME:004554/0550;SIGNING DATES FROM |
|
AS | Assignment |
Owner name: CONNECTICUT BANK & TRUST COMPANY, N.A., 100 CONSTI Free format text: SECURITY INTEREST;ASSIGNOR:QUAMCO, INC.;REEL/FRAME:004839/0972 Effective date: 19880219 |
|
AS | Assignment |
Owner name: HELLER FINANCIAL, INC. Free format text: SECURITY INTEREST;ASSIGNOR:QUAMCO, INC., A CORP. OF DE;REEL/FRAME:005454/0071 Effective date: 19891213 |