CN112247635A - Flexible clamp for tightly supporting inner circle of workpiece - Google Patents

Flexible clamp for tightly supporting inner circle of workpiece Download PDF

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Publication number
CN112247635A
CN112247635A CN202011077121.8A CN202011077121A CN112247635A CN 112247635 A CN112247635 A CN 112247635A CN 202011077121 A CN202011077121 A CN 202011077121A CN 112247635 A CN112247635 A CN 112247635A
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CN
China
Prior art keywords
workpiece
elastic clamp
inner circle
clamp
aluminum alloy
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.)
Withdrawn
Application number
CN202011077121.8A
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Chinese (zh)
Inventor
徐嘉乐
李宇同
刘江
冯纪良
俞浩荣
姚素芹
袁志刚
吴新平
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.)
Changzhou Vocational Institute of Mechatronic Technology
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Changzhou Vocational Institute of Mechatronic Technology
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Publication date
Application filed by Changzhou Vocational Institute of Mechatronic Technology filed Critical Changzhou Vocational Institute of Mechatronic Technology
Priority to CN202011077121.8A priority Critical patent/CN112247635A/en
Publication of CN112247635A publication Critical patent/CN112247635A/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/12Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks

Abstract

The invention provides a flexible clamp for tightly supporting the inner circle of a workpiece, wherein a large taper shank shaft of the flexible clamp is arranged in a taper hole of a lathe spindle and is tensioned by a screw rod, the large taper shank shaft is assembled with an elastic clamp, the elastic clamp is in a disc shape and is provided with three straight grooves which are uniformly distributed at 120 degrees, the elastic clamp is in interference fit with a cast aluminum alloy workpiece, rivets are arranged between the adjacent straight grooves of the elastic clamp, three clamping jaws correspond to the three rivets in positions, the lathe spindle is connected with a three-jaw chuck, the three clamping jaws can simultaneously contract in the radial direction and expand in the radial direction, when the three clamping jaws simultaneously contract and press a rivet head, the elastic clamp contracts, the outer circle of the elastic clamp shrinks, after the cast aluminum alloy workpiece is installed, the three clamping jaws are released, the elastic clamp rebounds outwards, and the inner circle of the cast aluminum alloy. The invention can adapt to the size change of a workpiece, the positioning excircle of the clamp is completely sealed with the inner circle of the workpiece, the positioning precision is high, and no additional clamping element is needed.

Description

Flexible clamp for tightly supporting inner circle of workpiece
Technical Field
The invention relates to a flexible clamp for tightly supporting an inner circle of a workpiece, and belongs to the technical field of machine tool clamps.
Background
The method comprises the steps of processing and casting aluminum alloy parts in batches, wherein the size of an inner circle of each part is phi 400H9, after the inner circle is processed, waiting for the outline and the right end face of an outer circle of the part, and ensuring the coaxiality requirement of the phi 400H9 inner circle and a large outer circle.
The first traditional clamping scheme is as follows:
because the inner hole of the workpiece is large, a three-jaw chuck of a medium-sized lathe is used for clamping and tightly supporting the inner circle of the workpiece, as shown in figure 1, three clamping jaws of the three-jaw chuck extend into the inner hole of the workpiece, and the inner circle of the workpiece is tightly supported by utilizing the radial expansion force of the long jaw. Because three jaws of the three-jaw chuck are universal parts, the inner hole with large radial tension is the three jaws, and the inner hole with small radial tension is also the three jaws. When a workpiece is positioned by an inner circle, the diameter of the outer circle of each clamping jaw is the same as that of the inner circle of the workpiece, the clamping jaws are slightly larger and better, as shown in fig. 2, the three clamping jaws are completely sealed with the inner circle of the workpiece, the positioning clearance of the three-jaw chuck is eliminated, the contact area between each clamping jaw and the workpiece is increased, the positioning precision is high, and the radial tension is also large. This is an ideal situation, however, in practice three jaws of a three-jaw chuck cannot be made at all. The method is used for clamping and turning the outline and the right end face of the outer circle of the workpiece, is simple and practical, limits 5 degrees of freedom, belongs to incomplete positioning, can not well meet the requirement of coaxiality of the inner circle and the outer circle, and has high rejection rate.
The general practical situation is that the diameter of the outer circle of the clamping jaw is smaller than that of the inner circle of the workpiece, so that one clamping jaw is only in contact with one line with the inner circle of the workpiece, and three clamping jaws of the three-jaw chuck are in contact with three lines with the inner circle of the workpiece, as shown in fig. 3, the contact area is small, the positioning accuracy is poor, and the radial tightening firmness is also poor.
In another case, the diameter of the outer circle of the jaw is larger than the diameter of the inner circle of the workpiece, so that only two lines are in contact with one jaw and the inner circle of the workpiece, and six lines are in contact with three jaws of the three-jaw chuck and the inner circle of the workpiece, as shown in fig. 4-5, in this case, the contact area is small, the positioning accuracy is poor, and the inner circle of the cast aluminum alloy workpiece can be indented.
The traditional clamping scheme II is as follows:
as shown in fig. 6, the method of machining the mandrel is adopted, and for convenience of assembly, the matching of the outer circle of the mandrel and the inner hole of the workpiece is clearance fit. Because the tolerance of the inner circle of phi 400H9 is 0.14mm, if the tolerance of the mandrel matching outer circle is only 0.01mm, the maximum matching clearance between the mandrel matching outer circle and the workpiece inner hole is 0.15mm, and the minimum matching clearance is 0.01 mm. So when the fit clearance of dabber cooperation excircle and certain work piece hole is less, can guarantee the axiality requirement of work piece inner circle and big excircle, when the fit clearance of dabber excircle and certain work piece hole is great, just can not guarantee the axiality requirement of work piece inner circle and big excircle, restrict 5 degrees of freedom, belong to incomplete location, but the right-hand member face can not be processed, most leading still can not guarantee well the axiality requirement of inner circle and excircle, there is the waste product to appear.
The technical defects of the traditional clamping scheme are as follows:
(1) according to the traditional clamping scheme I, the clamping jaw circular arc of the three-jaw chuck cannot be completely sealed with the inner circle of the workpiece, the contact area is small, the positioning precision is poor, the firmness degree of radial expansion force is also poor, and the rejection rate is high.
(2) The traditional clamping scheme II has the defect that the fit clearance between the excircle of the mandrel and the inner hole of the workpiece is large, the defect of poor positioning precision exists, and the right end face of the workpiece cannot be machined.
(3) When the shape and the size of the workpiece are changed to a certain extent, the rigid fixture cannot adapt to the change, the change of the inner circle size of the workpiece is only 0.14mm, the rigid mandrel fixture cannot adapt to the change, and waste products appear.
Disclosure of Invention
The invention aims to solve the technical problems mentioned in the background technology, and provides a flexible clamp for tightly supporting the inner circle of a workpiece.
The invention provides a flexible clamp for tightly supporting the inner circle of a workpiece, which comprises a large taper shank shaft, a three-jaw chuck, three jaws, an elastic clamp and a rivet, wherein the large taper shank shaft is arranged in a taper hole of a lathe spindle and is tensioned by a screw rod, the large taper shank shaft is assembled with the elastic clamp, the elastic clamp is in a disc shape and is provided with three straight grooves which are uniformly distributed at 120 degrees, the diameter of the outer circle of the elastic clamp is larger than that of the inner circle of a cast aluminum alloy workpiece, the elastic clamp is in interference fit with the cast aluminum alloy workpiece, the rivet is arranged between the adjacent straight grooves of the elastic clamp, the three jaws correspond to the three rivets in position, the lathe spindle is connected with the three-jaw chuck, the three jaws can be radially contracted and radially expanded simultaneously, when the three jaws are contracted and pressed to a rivet head simultaneously, the elastic clamp is contracted, the outer circle of the elastic clamp is contracted, the cast, and (4) loosening the three clamping jaws, and enabling the elastic clamp to rebound outwards to support the inner circle of the cast aluminum alloy workpiece tightly.
Preferably, the elastic clamp is made of 60Si2Mn, and the elasticity is good.
Preferably, the large taper shank shaft and the elastic clamp are assembled together through a nut.
Preferably, a washer is arranged between the nut and the elastic clamp.
The flexible clamp for tightly supporting the inner circle of the workpiece has the beneficial effects that: the flexible clamp for tightly supporting the inner circle of the workpiece is simple, convenient and practical, and can be used for completing contraction by using a three-jaw chuck commonly used by lathes, unloading the workpiece, loosening the three-jaw chuck to complete tightly supporting the workpiece and completing clamping.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic structural view of clamping and tightening an inner circle of a workpiece by using a three-jaw chuck in a first embodiment of the background art of the invention;
fig. 2 is a schematic structural view of an ideal situation in which three jaws are completely sealed with the inner circle of a workpiece in the first solution according to the background of the invention;
FIG. 3 is a schematic diagram of a structure of a jaw in line contact with an inner circle of a workpiece in an actual situation in a first embodiment of the background art of the present invention;
fig. 4 is a schematic structural diagram of a jaw in a first embodiment of the present invention contacting with two lines of an inner circle of a workpiece;
FIG. 5 is a partial enlarged view of the contact portion of FIG. 4;
FIG. 6 is a schematic diagram of an apparatus for manufacturing a string core shaft according to a second embodiment of the present invention;
wherein: 1-1-mandrel, 2-2-workpiece, 3-3-washer, 4-4-nut;
FIG. 7 is a schematic structural view of a flexible clamp for tightening an inner circle of a workpiece according to the present invention;
FIG. 8 is a front view of a disc-shaped elastic clamp according to the present invention;
FIG. 9 is a cross-sectional view of a disc-shaped elastic clamp according to the present invention;
wherein: 1-screw rod, 2-big taper shank shaft, 3-claw, 4-elastic clamp, 5-rivet, 6-straight groove, 7-cast aluminum alloy workpiece, 8-washer, 9-nut.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
the first embodiment is as follows: this embodiment is described with reference to fig. 1 to 9. The flexible clamp for tightly stretching the inner circle of the workpiece comprises a large taper shank shaft 2, a three-jaw chuck, three jaws 3, an elastic clamp 4 and rivets 5, wherein the large taper shank shaft 2 is arranged in a taper hole of a lathe spindle and is tensioned by a screw 1, the large taper shank shaft 2 is assembled with the elastic clamp 4, the elastic clamp 4 is disc-shaped and is provided with three straight grooves 6 uniformly distributed at 120 degrees, the diameter of the outer circle of the elastic clamp 4 is larger than that of the inner circle of a cast aluminum alloy workpiece 7, the elastic clamp 4 is in interference fit with the cast aluminum alloy workpiece 7, the rivets 5 are arranged between the adjacent straight grooves 6 of the elastic clamp 4, the three jaws 3 correspond to the three rivets 5,
the lathe spindle is connected with the three-jaw chuck, and three jack catch 3 can contract radially simultaneously, radially enlarges simultaneously, when three jack catch 3 contracts simultaneously and press 5 heads of rivet, elastic fixture 4 contracts, and elastic fixture 4's excircle reduces, installs casting aluminum alloy work piece 7 after, loosens three jack catch 3, and elastic fixture 4 outwards kick-backs, props up the interior circle of casting aluminum alloy work piece 7 tightly.
The elastic clamp 4 is made of 60Si2Mn, and is good in elasticity.
The large taper shank shaft 2 and the elastic clamp 4 are assembled together through a nut 9.
And a washer 8 is arranged between the nut 9 and the elastic clamp 4.
Fig. 7 is a schematic structural view of the flexible clamp for tightening the inner circle of the workpiece according to the present invention. And finishing the inner circle of the cast aluminum alloy workpiece 7, and waiting for the outer circle outline and the right end face of the vehicle. The elastic clamp 4 is in a disc shape, three straight grooves 6 which are uniformly distributed at 120 degrees are formed in the elastic clamp 4, the figure is 8, the excircle of the disc-shaped elastic clamp 4 is slightly larger than the inner circle of the cast aluminum alloy workpiece 7, the disc-shaped elastic clamp 4 is made of 60Si2Mn, and the elasticity is sufficient.
A large taper shank shaft 2 is arranged in a taper hole of a lathe spindle and is tensioned by a screw rod 1, and the large taper shank shaft 2 is assembled with an elastic clamp 4. Three rivets 5 which are uniformly distributed are arranged between the straight groove and the straight groove of the disc-shaped elastic clamp 4, when the three clamping jaws 3 simultaneously contract and press the rivet heads, the disc-shaped elastic clamp 4 contracts, the outer circle of the disc-shaped elastic clamp 4 is reduced, after the cast aluminum alloy workpiece 7 is installed, the three clamping jaws 3 are loosened, the disc-shaped elastic clamp 4 rebounds outwards, and the inner circle of the cast aluminum alloy workpiece 7 is tightly supported. The inner circle of the cast aluminum alloy workpiece 7 is tightly matched with the outer circle of the disc-shaped elastic clamp 4 to limit 4 degrees of freedom, the left end face of the cast aluminum alloy workpiece 7 is in contact with the shaft shoulder of the disc-shaped elastic clamp 4 to limit 1 degree of freedom, 5 degrees of freedom are limited, and incomplete positioning is achieved. Because the excircle of the disk-shaped elastic clamp 4 is slightly larger than the inner circle of the cast aluminum alloy workpiece 7, the excircle and the inner circle are completely sealed, and the positioning precision is high. The turning of cast aluminium alloys is less, with cutting forces and cutting power, about 70% less than cutting steel, and no additional clamping elements are required, the disc-shaped elastic clamp 4 being both a positioning element and a clamping element.
The technical improvement points of the invention are as follows:
(1) when the size of the inner circle of the workpiece is changed to a certain extent, the rigid clamp cannot adapt to the change, and the flexible clamp for tightly supporting the inner circle of the workpiece can adapt to the change.
(2) The excircle of the disc-shaped elastic clamp 4 is slightly larger than the inner circle of the cast aluminum alloy workpiece, the excircle of the clamp is completely sealed with the inner circle of the workpiece, and the positioning precision is high.
(3) Turning cast aluminum alloys with less cutting force and power, approximately 70% less than cutting steel, requires no additional clamping elements. The disc-shaped elastic clamp is both a positioning element and a clamping element.
(4) The disc-shaped elastic clamp 4 uses three uniformly distributed straight grooves 6 to establish elasticity change.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. The flexible clamp for tightly supporting the inner circle of the workpiece is characterized by comprising a large taper shank shaft (2), a three-jaw chuck, three clamping jaws (3), an elastic clamp (4) and rivets (5), wherein the large taper shank shaft (2) is arranged in a taper hole of a lathe spindle and is tensioned by a screw (1), the large taper shank shaft (2) and the elastic clamp (4) are assembled together, the elastic clamp (4) is disc-shaped and is provided with three straight grooves (6) uniformly distributed at 120 degrees, the outer circle diameter of the elastic clamp (4) is larger than the inner circle diameter of a cast aluminum alloy workpiece (7), the elastic clamp (4) is in interference fit with the cast aluminum alloy workpiece (7), the rivets (5) are arranged between the adjacent straight grooves (6) of the elastic clamp (4), and the three clamping jaws (3) correspond to the three rivets (5),
lathe spindle is connected with the three-jaw chuck, and three jack catch (3) can be radial shrink simultaneously, radial expansion simultaneously, when three jack catch (3) shrink simultaneously and press to rivet (5) when first, elasticity anchor clamps (4) shrink, and the excircle of elasticity anchor clamps (4) is dwindled, installs casting aluminum alloy work piece (7) back, loosens three jack catch (3), and elasticity anchor clamps (4) outwards kick-back props the interior circle of casting aluminum alloy work piece (7) tightly.
2. The flexible clamp for tightening the inner circle of a workpiece according to claim 1, wherein the elastic clamp (4) is made of 60Si2Mn, and has good elasticity.
3. The flexible clamp for tightening the inner circle of a workpiece according to claim 1, wherein the large taper shank arbor (2) and the elastic clamp (4) are assembled together by a nut (9).
4. A flexible clamp for tightening the inner circle of a workpiece according to claim 3, wherein a washer (8) is provided between the nut (9) and the elastic clamp (4).
CN202011077121.8A 2020-10-10 2020-10-10 Flexible clamp for tightly supporting inner circle of workpiece Withdrawn CN112247635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011077121.8A CN112247635A (en) 2020-10-10 2020-10-10 Flexible clamp for tightly supporting inner circle of workpiece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011077121.8A CN112247635A (en) 2020-10-10 2020-10-10 Flexible clamp for tightly supporting inner circle of workpiece

Publications (1)

Publication Number Publication Date
CN112247635A true CN112247635A (en) 2021-01-22

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CN202011077121.8A Withdrawn CN112247635A (en) 2020-10-10 2020-10-10 Flexible clamp for tightly supporting inner circle of workpiece

Country Status (1)

Country Link
CN (1) CN112247635A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114346546A (en) * 2022-03-07 2022-04-15 承德石油高等专科学校 Rotary welding table for machining capable of performing annular weld treatment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114346546A (en) * 2022-03-07 2022-04-15 承德石油高等专科学校 Rotary welding table for machining capable of performing annular weld treatment

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Application publication date: 20210122

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