US2340384A - Lapping tool - Google Patents
Lapping tool Download PDFInfo
- Publication number
- US2340384A US2340384A US454993A US45499342A US2340384A US 2340384 A US2340384 A US 2340384A US 454993 A US454993 A US 454993A US 45499342 A US45499342 A US 45499342A US 2340384 A US2340384 A US 2340384A
- Authority
- US
- United States
- Prior art keywords
- parts
- lap
- mercury
- tin
- lead
- 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
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
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/11—Lapping tools
- B24B37/12—Lapping plates for working plane surfaces
- B24B37/14—Lapping plates for working plane surfaces characterised by the composition or properties of the plate materials
Definitions
- This invention relates to lapping tools and the like, this application being a division of my pending application Serial No. 267,127, filed April 10, 1939.
- My invention contemplates a lapping tool particularly adapted for use as a finishing" lap with suitable granular abrasive to completesthe' finishing operation upon hard objects such as metal-working rolls and the like.
- the foregoing lap may be followed in finishing operations with a. lap having the following composition Parts by weight Lead 60 Bismuth 80 Mercury 15 Tin Such a lap develops a very high color on the work. By the use of this lap, microscopic analysis reveals that the surface of the work acquires a very high lustre therefrom.
- the desirable characteristics attributable to the metals specified are those which will provide sufficient mechanical strength to enable the grain to cut, and yet, which will be soft enough to charge with abrasives, and sufficiently granular to wear away so as to obviate bunching or seizing of the cuttings and abrasive grains; and which will also provide a surface of the requisite porosity to receive the latter in order that they may be retired harmlessly from pressure contact with the surface of the work.
- a finishing lap consisting of a friable composition molded into block form containing approximately, by weight, to parts of lead, 10 to 25 parts of tin, 20 to 30 parts of bismuth, and 15 parts of mercury, characterized by having suflicient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
- a finishing lap consisting of a friable composition molded into block form containing approximately, by weight, 70 parts of lead, 20 parts of bismuth, 25 parts of tin, and 15 parts of mercury, characterized by having sufficient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
- a finishing lap consisting of a friable composition molded into block form containing approximately, by weight, 60 parts of lead, 30 parts of bismuth, 15 parts of mercury, and 10 parts of tin, characterized by having suflicient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
Patented Feb. 1, 1944 LAPPING TOOL Foster F. Hillix, Lakewood, Ohio, assignor to The American Steel and Wire Company of New Jersey, a corporation of New Jersey No Drawing.
Original application April 10, 1939,
Serial No. 267,127. Divided and this application August 15, 1942, Serial No. 454,993
3 Claims.
This invention relates to lapping tools and the like, this application being a division of my pending application Serial No. 267,127, filed April 10, 1939.
My invention contemplates a lapping tool particularly adapted for use as a finishing" lap with suitable granular abrasive to completesthe' finishing operation upon hard objects such as metal-working rolls and the like.
I have discovered that lapping tools composed of a friable metal composition produce highly satisfactory results for the purposes stated, and that lead, tin, bismuth and mercury, when combined in substantially the following proportions is particularly suitable for such a "finishing" lap when molded into block form:
Parts by weight Lead 60-70 Tin 10-25 Bismu 20-30 Mercury 15 the foregoing proportions, the following composition may be employed to produce a finish on the work of high color:
Parts by weight 70 Lead Tin 25 Bismuth--- 20 Mercury 15 The abrasive to be used to greatest advantage with this lap is finely graded No. 5 lens powder.
The foregoing lap may be followed in finishing operations with a. lap having the following composition Parts by weight Lead 60 Bismuth 80 Mercury 15 Tin Such a lap develops a very high color on the work. By the use of this lap, microscopic analysis reveals that the surface of the work acquires a very high lustre therefrom.
The desirable characteristics attributable to the metals specified are those which will provide sufficient mechanical strength to enable the grain to cut, and yet, which will be soft enough to charge with abrasives, and sufficiently granular to wear away so as to obviate bunching or seizing of the cuttings and abrasive grains; and which will also provide a surface of the requisite porosity to receive the latter in order that they may be retired harmlessly from pressure contact with the surface of the work.
Various changes and modifications are contemplated within the scope of the following claims.
I claim:
1. A finishing lap consisting of a friable composition molded into block form containing approximately, by weight, to parts of lead, 10 to 25 parts of tin, 20 to 30 parts of bismuth, and 15 parts of mercury, characterized by having suflicient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
2. A finishing lap consisting of a friable composition molded into block form containing approximately, by weight, 70 parts of lead, 20 parts of bismuth, 25 parts of tin, and 15 parts of mercury, characterized by having sufficient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
3. A finishing lap consisting of a friable composition molded into block form containing approximately, by weight, 60 parts of lead, 30 parts of bismuth, 15 parts of mercury, and 10 parts of tin, characterized by having suflicient strength to apply a cutting pressure thereby to a fine polishing powder, and being soft enough to become charged with said powder.
ros'mn r'. max
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US454993A US2340384A (en) | 1939-04-10 | 1942-08-15 | Lapping tool |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US26712739A | 1939-04-10 | 1939-04-10 | |
| US454993A US2340384A (en) | 1939-04-10 | 1942-08-15 | Lapping tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2340384A true US2340384A (en) | 1944-02-01 |
Family
ID=26952236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US454993A Expired - Lifetime US2340384A (en) | 1939-04-10 | 1942-08-15 | Lapping tool |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2340384A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3520666A (en) * | 1967-06-14 | 1970-07-14 | American Abrasive Corp | Bismuth alloy impregnated grinding wheel |
| CN103465154A (en) * | 2013-09-07 | 2013-12-25 | 南通春光自控设备工程有限公司 | Soft grinding and polishing disc |
-
1942
- 1942-08-15 US US454993A patent/US2340384A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3520666A (en) * | 1967-06-14 | 1970-07-14 | American Abrasive Corp | Bismuth alloy impregnated grinding wheel |
| CN103465154A (en) * | 2013-09-07 | 2013-12-25 | 南通春光自控设备工程有限公司 | Soft grinding and polishing disc |
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