CA1145592A - Replacable insert chuck jaw - Google Patents
Replacable insert chuck jawInfo
- Publication number
- CA1145592A CA1145592A CA000367394A CA367394A CA1145592A CA 1145592 A CA1145592 A CA 1145592A CA 000367394 A CA000367394 A CA 000367394A CA 367394 A CA367394 A CA 367394A CA 1145592 A CA1145592 A CA 1145592A
- Authority
- CA
- Canada
- Prior art keywords
- gripping
- chuck
- jaw
- side walls
- gripping member
- 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
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
- B23B31/1627—Details of the jaws
- B23B31/16275—Form of the jaws
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
ABSTRACT
In this invention, the component of a chuck jaw that makes contact with the material to be held, is a throw-away type of carbide insert. The insert is secured to the chuck jaw with a screw and accurately located in a recess of the jaw. The corner of the insert digs into the workpiece material resulting in a strong gripthat prevents slippage. The insert can be indexed into 4 positions. This applicat-ion can be used for inner-gripping and outer-gripping chuck jaws. When all fourcorners of the insert are ?orn out, a new insert can readily be installed without removing the jaw from the chuck. No additional alignment is needed due to the accuracy of the positioning of the insert in the jaw.
In this invention, the component of a chuck jaw that makes contact with the material to be held, is a throw-away type of carbide insert. The insert is secured to the chuck jaw with a screw and accurately located in a recess of the jaw. The corner of the insert digs into the workpiece material resulting in a strong gripthat prevents slippage. The insert can be indexed into 4 positions. This applicat-ion can be used for inner-gripping and outer-gripping chuck jaws. When all fourcorners of the insert are ?orn out, a new insert can readily be installed without removing the jaw from the chuck. No additional alignment is needed due to the accuracy of the positioning of the insert in the jaw.
Description
~1~559Z
This invention relates to chuck jaw assemblies.
In particular this invention relates to a chuck jaw assembly having a gripping member releasably mounted thereon.
PRIOR ART
Chuck jaws are conventionally made from ha dened steel or from unhardened steel.
The chuck jaws which are made from hardened steel have the advantage of having superior wear resistance to those which are made from unhardened steel and they have a superior gripping ability in that they are more easily embedded into a workpiece. Hardened chuck jaws such as those commonly made from steel are expensive and are difficult to machine when worn.
Chuck jaws which are made from unhardened steel can be easily machined; however they wear very rapidly with the result that they require considerable maintenance.
Furthermore, repeated replacement of chuck jaws increases the down time in the operation of production machinery.
An additional problem which is encountered in the use of conventional chuck jaws is in the gripping of the workpiece with sufficient clamping force to permit high load machining of the workpiece. Frequently the ability of the chuck jaws to rigidly clamp the workpiece determines the rate at which machining of the workpiece may be effected rather than the power output capacity of the machine.
,0,...
~' ~1~559Z
I have found that the above difficulties can be overcome by forming a chuck jaw assembly in which a gripping member is releasably mounted in the body of the chuck jaw and wherein the gripping member is made from a wear resistant material such as hardened steel. The grip~ing member is releasably mounted on the body of the chuck jaw assembly.
With this combination it is possible to make the body o the chuck jaw from an unhardened metal while making the gripping members from a hardened metal. I am now able to obtain the advantages to be derived from the use of hardened chuck jaws or unhardened chuck jaws without the disadvantages normally associated therewith.
According to one aspect of the present invention, a chuck jaw assembly comprises; a body adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, said body having a clamping face arranged to be disposed in a face to face relationship wi~h a workpiece in use, a first gripping member releasably mounted on said body such that a gripping portion thereof projects beyond said clamping face of said body to be engageable with a workpiece in use, said gripping member being formed from a wear resistant material.
According to a further aspect of the present invention a chuck jaw assembly comprising; a body having slide portions adapted to be mounted in a chuck so as to D
~1~5~92 be movable between a work engaging position and a work release position, and at least one jaw segment mounted on said slide portion, each jaw segment having a clamping face extending in an arcuate path, a pair of seats formed in each jaw segment at circumferentially spaced intervals along its clamping face, each seat having a bottom wall and a pair of side walls, said side walls extending at right angles to one another with the plane which bisects the angle formed between the side walls extending radially of said arcuate path, a pair of gripping members for each jaw segment, each gripping member having four side faces arranged in the square configuration and forming clamping edges at each corner formed between adjacent side faces, said gripping members being releasably seated within each of said seats of said jaw segment whereby any one of said clamping edges may be positioned to project from said clamping face, said gripping members being formed from a wear resistant material such as.
The invention will be more clearly understood as a reference to the following detailed specification read in conjunction with the drawings wherein:
Figure la is a front view of a chuck jaw constructed in accordance with an embodiment of the present invention, Figure 2a is a sectional view taken along the line D
~145592
This invention relates to chuck jaw assemblies.
In particular this invention relates to a chuck jaw assembly having a gripping member releasably mounted thereon.
PRIOR ART
Chuck jaws are conventionally made from ha dened steel or from unhardened steel.
The chuck jaws which are made from hardened steel have the advantage of having superior wear resistance to those which are made from unhardened steel and they have a superior gripping ability in that they are more easily embedded into a workpiece. Hardened chuck jaws such as those commonly made from steel are expensive and are difficult to machine when worn.
Chuck jaws which are made from unhardened steel can be easily machined; however they wear very rapidly with the result that they require considerable maintenance.
Furthermore, repeated replacement of chuck jaws increases the down time in the operation of production machinery.
An additional problem which is encountered in the use of conventional chuck jaws is in the gripping of the workpiece with sufficient clamping force to permit high load machining of the workpiece. Frequently the ability of the chuck jaws to rigidly clamp the workpiece determines the rate at which machining of the workpiece may be effected rather than the power output capacity of the machine.
,0,...
~' ~1~559Z
I have found that the above difficulties can be overcome by forming a chuck jaw assembly in which a gripping member is releasably mounted in the body of the chuck jaw and wherein the gripping member is made from a wear resistant material such as hardened steel. The grip~ing member is releasably mounted on the body of the chuck jaw assembly.
With this combination it is possible to make the body o the chuck jaw from an unhardened metal while making the gripping members from a hardened metal. I am now able to obtain the advantages to be derived from the use of hardened chuck jaws or unhardened chuck jaws without the disadvantages normally associated therewith.
According to one aspect of the present invention, a chuck jaw assembly comprises; a body adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, said body having a clamping face arranged to be disposed in a face to face relationship wi~h a workpiece in use, a first gripping member releasably mounted on said body such that a gripping portion thereof projects beyond said clamping face of said body to be engageable with a workpiece in use, said gripping member being formed from a wear resistant material.
According to a further aspect of the present invention a chuck jaw assembly comprising; a body having slide portions adapted to be mounted in a chuck so as to D
~1~5~92 be movable between a work engaging position and a work release position, and at least one jaw segment mounted on said slide portion, each jaw segment having a clamping face extending in an arcuate path, a pair of seats formed in each jaw segment at circumferentially spaced intervals along its clamping face, each seat having a bottom wall and a pair of side walls, said side walls extending at right angles to one another with the plane which bisects the angle formed between the side walls extending radially of said arcuate path, a pair of gripping members for each jaw segment, each gripping member having four side faces arranged in the square configuration and forming clamping edges at each corner formed between adjacent side faces, said gripping members being releasably seated within each of said seats of said jaw segment whereby any one of said clamping edges may be positioned to project from said clamping face, said gripping members being formed from a wear resistant material such as.
The invention will be more clearly understood as a reference to the following detailed specification read in conjunction with the drawings wherein:
Figure la is a front view of a chuck jaw constructed in accordance with an embodiment of the present invention, Figure 2a is a sectional view taken along the line D
~145592
2-2 in Figure la, Figure 3a is a sectional side view through a portion of a jaw segment constructed in accordance with a further embodiment to the present invention, Figure 4a is a sectional side view of a portion of a jaw segment constructed in accordance with another embodiment of the inven-tion, Figure 5a is an end view of a jaw segment suitable for use as an internal clampiny jaw, Figure 6a is a sectional side view of a jaw segment taken on the line 6-6 of Figure Sa, Figure 7a is a side view similar to Figure 6a showlny dn a'ternative jaw segment construction, Figure lb is a front view of a chuck jaw assembly in which the jaw segment is pivotally mounted, Figure 2b is a sectional view along the line 9-9 of Figure lb, Figures 3b and 4b are sectional side views of jaw segments facilitating alternative embodiments of the present invention, Figure Sb is an end view of the chuck jaw assembly of Figure lb, Figure lc is a front view of a chuck jaw assembly constructed in accordance with yet another embodiment of .~
~145592 the present invention, Figure 2c is a partially sectioned side view of the chuck jaw assembly of Figure lc, Figure 3c is a sectional side view of a chuck jaw segment constructed in accordance with yet another embodiment of the present invention, Figure 4c is a sectional side view of a chuck jaw assembly constructed in accordance with still further embodiments of the present invention, and With reference to the drawings like numerals apply to like parts throughout the specification.
With reference to Figure 1 of the drawings the chuck jaw assembly comprises a body 10, a removable jaw supporting segment 1, and a pair of gripping members 5. The segment 1 is secured to the base 2 by a plurality of cap screws 4. A back stop 7 is mounted on the segment 1. A
centering pin 3 is mounted on the base 1 and projects into a notch 14 formed in the segment 1. The gripping members 5 are releasably secured to the segment 1 by means of mounting screws 6. A pair of mounting passages 12 are formed in the base 2 for use in releasably securing the chuck jaw assembly 2 by a conventional chuck jaw support wherein the chuck jaw D-~1455~2 assembly is mounted for movement toward and away from a workpiece.
A pair of seats 16 are formed in each jaw segment at circumferentially spaced intervals along the clamping face 18 of the segment 1. Each seat has a bottom wall 20 and a pair of side walls 22. The side walls 22 extend at right angles to one another and line 24 which bisects the angle formed between the side walls 22 extends radially of the arcuate path and the clamping face 18.
The gripping members 5 each have four side faces 26 arranged in a square configuration forming clamping edges 28 which project radially inwardly from the clamping face 18. The corners 28 are chamfered from above and below to form a sharp point which serves to bite into the workpiece.
The base portion is preferably made from steel which is readily machinable whereas the gripping members are preferably made from a hardened tool steel or a carbide material which has good wear-resisting characteristics.
Figure 3 of the drawings illustrates a further embodiment in which the corners 28 are machined to a sawtooth configuration to provide increased gripping capacity. Figure 4 illustrates a further embodiment in which gripping members are mounted at the inner and outer faces of the segment.
~S592 In the embodiments illustrated in Figures 1 through 4 the chuck jaw assembly is suitable for use as one of a number of jaw assemblies used to clamp the ex'ernal periphery of the workpiece.
Figures 5, 6, and 7 illustrate further embodiments of the invention in which the clamping members 5 are mounted radially inwardly from the clamping face 18. This form of segment is suitable for use in association with a chuck jaw to provide for the clamping of the internal periphery of a workpiece. Figures 6 and 7 illustrate ~he manner in which gripping members 5 are seated in the segment 8.
In the embodiments illustrated in Figures 8 through 11, the segments 1 have a stem portion 30 mounted in a passage 32 and retained by a retaining plate 34 and mounting screw 36. The segment 1 is rotatable about the axis 38 so as to be self-aligning.
The embodiments illustrated in Figures 13 through 16 differ from those of Figures 8 through 11 in that two segments 1 are mounted on the base 2. Both of the segments 1 are rotatable about their axis 38 so as to be self-aligning.
From the foregoing it will be apparent that the present invention provides a simple and inexpensive chuck jaw assembly in which the hardened workpiece gripping members are small in size in proportion to the main body of 11455~Z
the chuck jaw assembly and are releasably mounted thereon so that after they are worn they may be removed and replaced by new gripping members. Furthermore, the gripping members are shaped to provide an improved gripping ability. These and -other advantages of the present invention will be apparent to those skilled in the art.
~145592 the present invention, Figure 2c is a partially sectioned side view of the chuck jaw assembly of Figure lc, Figure 3c is a sectional side view of a chuck jaw segment constructed in accordance with yet another embodiment of the present invention, Figure 4c is a sectional side view of a chuck jaw assembly constructed in accordance with still further embodiments of the present invention, and With reference to the drawings like numerals apply to like parts throughout the specification.
With reference to Figure 1 of the drawings the chuck jaw assembly comprises a body 10, a removable jaw supporting segment 1, and a pair of gripping members 5. The segment 1 is secured to the base 2 by a plurality of cap screws 4. A back stop 7 is mounted on the segment 1. A
centering pin 3 is mounted on the base 1 and projects into a notch 14 formed in the segment 1. The gripping members 5 are releasably secured to the segment 1 by means of mounting screws 6. A pair of mounting passages 12 are formed in the base 2 for use in releasably securing the chuck jaw assembly 2 by a conventional chuck jaw support wherein the chuck jaw D-~1455~2 assembly is mounted for movement toward and away from a workpiece.
A pair of seats 16 are formed in each jaw segment at circumferentially spaced intervals along the clamping face 18 of the segment 1. Each seat has a bottom wall 20 and a pair of side walls 22. The side walls 22 extend at right angles to one another and line 24 which bisects the angle formed between the side walls 22 extends radially of the arcuate path and the clamping face 18.
The gripping members 5 each have four side faces 26 arranged in a square configuration forming clamping edges 28 which project radially inwardly from the clamping face 18. The corners 28 are chamfered from above and below to form a sharp point which serves to bite into the workpiece.
The base portion is preferably made from steel which is readily machinable whereas the gripping members are preferably made from a hardened tool steel or a carbide material which has good wear-resisting characteristics.
Figure 3 of the drawings illustrates a further embodiment in which the corners 28 are machined to a sawtooth configuration to provide increased gripping capacity. Figure 4 illustrates a further embodiment in which gripping members are mounted at the inner and outer faces of the segment.
~S592 In the embodiments illustrated in Figures 1 through 4 the chuck jaw assembly is suitable for use as one of a number of jaw assemblies used to clamp the ex'ernal periphery of the workpiece.
Figures 5, 6, and 7 illustrate further embodiments of the invention in which the clamping members 5 are mounted radially inwardly from the clamping face 18. This form of segment is suitable for use in association with a chuck jaw to provide for the clamping of the internal periphery of a workpiece. Figures 6 and 7 illustrate ~he manner in which gripping members 5 are seated in the segment 8.
In the embodiments illustrated in Figures 8 through 11, the segments 1 have a stem portion 30 mounted in a passage 32 and retained by a retaining plate 34 and mounting screw 36. The segment 1 is rotatable about the axis 38 so as to be self-aligning.
The embodiments illustrated in Figures 13 through 16 differ from those of Figures 8 through 11 in that two segments 1 are mounted on the base 2. Both of the segments 1 are rotatable about their axis 38 so as to be self-aligning.
From the foregoing it will be apparent that the present invention provides a simple and inexpensive chuck jaw assembly in which the hardened workpiece gripping members are small in size in proportion to the main body of 11455~Z
the chuck jaw assembly and are releasably mounted thereon so that after they are worn they may be removed and replaced by new gripping members. Furthermore, the gripping members are shaped to provide an improved gripping ability. These and -other advantages of the present invention will be apparent to those skilled in the art.
Claims (9)
1. A chuck jaw assembly comprising:
(a) a body adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, said body having a clamping face arranged to be disposed in a face to face relationship with a workpiece in use, (b) a first gripping member releasably mounted on said body such that a gripping portion thereof projects beyond said clamping face of said body to be engageable with a workpiece in use, said gripping member being formed from a wear resistant material.
(a) a body adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, said body having a clamping face arranged to be disposed in a face to face relationship with a workpiece in use, (b) a first gripping member releasably mounted on said body such that a gripping portion thereof projects beyond said clamping face of said body to be engageable with a workpiece in use, said gripping member being formed from a wear resistant material.
2. A chuck jaw assembly as claimed in claim 1 wherein a second gripping member is releasably mounted on said body such that the gripping portion thereof projects beyond said clamping face to be engageable with a workpiece.
3. A chuck jaw assembly as claimed in claim 2 wherein said first and second gripping members are located at circumferentially spaced intervals along said clamping face of said jaw.
4. A chuck jaw assembly as claimed in claim 1 wherein said body is formed with a seat at said clamping face, said seat having a lower wall and at least two side walls, said lower wall being arranged to underlie the gripping member and the side walls being arranged to provide lateral support for said gripping members.
5. A chuck jaw assembly as claimed in claim 4 wherein said gripping member has side faces which are inclined with respect to one another to form a plurality of gripping edges, said side walls of said seat being arranged to support said side walls of said gripping member with any one of said gripping edges positioned for engagement with a workpiece.
6. A chuck jaw assembly as claimed in claim 2 wherein said body is formed with a pair of seats at said clamping face, each seat having a lower wall and at least two side walls, the lower wall being arranged to underlie one of said gripping members and the side walls being arranged to provide lateral support for said one gripping member.
7. A chuck jaw assembly as claimed in claim 6 wherein each gripping member has side faces which are inclined with respect to one another to form a plurality of gripping edges, the side walls of each seat being arranged to support the side walls of one gripping member with any one of the gripping edges of said one gripping member being positioned for engagement with a workpiece.
8. A chuck jaw assembly comprising:
(a) a body having slide portions adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, and at least one jaw segment mounted on said slide portion, each jaw segment having a clamping face extending in an arcuate path, (b) a pair of seats formed in each jaw segment at circumferentially spaced intervals along its clamping face, each seat having a bottom wall and a pair of side walls, said side walls extending at right angles to one another with the plane which bisects the angle formed between the side walls extending radially of said arcuate path, (c) a pair of gripping members for each jaw segment, each gripping member having four side faces arranged in the square configuration and forming clamping edges at each corner formed between adjacent side faces, said gripping members being releasably seated within each of said seats of said jaw segment whereby any one of said clamping edges may be positioned to project from said clamping face, said gripping members being formed from a wear resistant material.
(a) a body having slide portions adapted to be mounted in a chuck so as to be movable between a work engaging position and a work release position, and at least one jaw segment mounted on said slide portion, each jaw segment having a clamping face extending in an arcuate path, (b) a pair of seats formed in each jaw segment at circumferentially spaced intervals along its clamping face, each seat having a bottom wall and a pair of side walls, said side walls extending at right angles to one another with the plane which bisects the angle formed between the side walls extending radially of said arcuate path, (c) a pair of gripping members for each jaw segment, each gripping member having four side faces arranged in the square configuration and forming clamping edges at each corner formed between adjacent side faces, said gripping members being releasably seated within each of said seats of said jaw segment whereby any one of said clamping edges may be positioned to project from said clamping face, said gripping members being formed from a wear resistant material.
9. A chuck jaw assembly as claimed in claim 8 wherein two jaw segments are pivotally mounted on said slide portion at circumferentially spaced intervals, the clamping basis of said jaw segments being self aligning in said arcuate path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000367394A CA1145592A (en) | 1980-12-23 | 1980-12-23 | Replacable insert chuck jaw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000367394A CA1145592A (en) | 1980-12-23 | 1980-12-23 | Replacable insert chuck jaw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1145592A true CA1145592A (en) | 1983-05-03 |
Family
ID=4118763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000367394A Expired CA1145592A (en) | 1980-12-23 | 1980-12-23 | Replacable insert chuck jaw |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1145592A (en) |
-
1980
- 1980-12-23 CA CA000367394A patent/CA1145592A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |