GB373998A - Improvements in method and machine for grinding worms and screws - Google Patents
Improvements in method and machine for grinding worms and screwsInfo
- Publication number
- GB373998A GB373998A GB2555/31A GB255531A GB373998A GB 373998 A GB373998 A GB 373998A GB 2555/31 A GB2555/31 A GB 2555/31A GB 255531 A GB255531 A GB 255531A GB 373998 A GB373998 A GB 373998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- worm
- work
- axis
- grinding wheel
- grinding
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F13/00—Making worms by methods essentially requiring the use of machines of the gear-cutting type
- B23F13/02—Making worms of cylindrical shape
- B23F13/04—Making worms of cylindrical shape by grinding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
373,998. Gear-grinding. TRBOJEVICH, N., 71, Glendale Avenue, Highland Park, Michigan, U.S.A. Jan. 26, 1931, No. 2555. Convention date, July 7, 1930. [Class 83 (iii).] In a method of grinding worms, screws and the like the work is moved axially and correspondingly rotated to feed it in a helical path past a rotary grinding-wheel which is oscillated in a straight line path in a direction transverse to the work axis. Fig. 1 shows a transverse section 21 through a double-threaded worm having tooth curves 23 which are involutes developed from the base circle 24. The section 21 may be regarded as a spur gear element meshing with a rack element 29 which is straight sided in the case of involute teeth and has a pitch line 29 tangential to the pitch circle 25. When the section 21 is rotated and moved axially to describe the complete worm surface the imaginary rack will be moved in the direction of the worm axis 31 and also along its pitch line. The rack teeth will thus describe a prism having an axis along the line 33, Fig. 2. Formulµ are given in the Specification for determining the thickness t<1> and the pressure angle A<1> of the rack section of a grinding wheel 34 which may be oscillated along the line 33 during the helical movement of the worm blank to generate the required teeth The path of the instantaneous points of contact between the grinding wheel 34 and the worm thread are shown by the straight lines N<1>, K<1>, M<1>, H<1> in Fig. 2. From the position of these lines the amplitude of the transverse oscillation S<1> of the grinding wheel required to produce complete generation of the teeth is deduced. In a machine embodiment for carrying out the invention the worm blank is mounted in bearings on a plate 54, Fig. 8, carried by a table 42 which reciprocates in the direction of the arrows 70, 71 through the distance S<1>. The grinding wheel is mounted on a spindle 43 arranged at the helical angle D to the work axis. The work arbor 45 carries a master screw 49 which has the same lead as the worm to be ground and works in a stationary nut 51. The front of the work arbor is splined to a worm-wheel 57 operated by a worm on a spindle 62. At each reciprocation of the table a ratchet wheel 66 engages an abutment 72 to impart a small rotary movement to the work arbor, the work' being moved in the required helical path by the action of the master screw. In this way the worm is generated by a series of straight line cuts such as N<1>, K<1>, H<1>, M<1>, the generating lines produced by successive working strokes being about 4/1000" apart. In some cases the helical feed of the work may be continuous instead of intermittent and the grinding wheel may be reciprocated instead of the work table. Globoid worms may be ground in a similar way, Fig. 10, the grinding wheel 34 being arranged on an axis inclined at the helical angle D to the work axis and being reciprocated in the direction 70, 71 while the worm is progressively rotated on its axis and at the same time moved longitudinally in a circular path. Where more than one thread is to be cut, the work is indexed between successive thread cutting operations.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US373998XA | 1930-07-07 | 1930-07-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB373998A true GB373998A (en) | 1932-05-26 |
Family
ID=21894135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2555/31A Expired GB373998A (en) | 1930-07-07 | 1931-01-26 | Improvements in method and machine for grinding worms and screws |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB373998A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102275016A (en) * | 2011-07-22 | 2011-12-14 | 重庆大学 | Double-side accurate grinding method and equipment for toothed surface of toroid enveloping worm |
CN114749731A (en) * | 2022-03-17 | 2022-07-15 | 广信新材料科技(长沙)有限责任公司 | Processing method of overlong insulation paper screw of transformer |
-
1931
- 1931-01-26 GB GB2555/31A patent/GB373998A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102275016A (en) * | 2011-07-22 | 2011-12-14 | 重庆大学 | Double-side accurate grinding method and equipment for toothed surface of toroid enveloping worm |
CN102275016B (en) * | 2011-07-22 | 2013-03-06 | 重庆大学 | Double-side accurate grinding method and equipment for toothed surface of toroid enveloping worm |
CN114749731A (en) * | 2022-03-17 | 2022-07-15 | 广信新材料科技(长沙)有限责任公司 | Processing method of overlong insulation paper screw of transformer |
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