CN113770404B - Internal tensioning clamp of lathe - Google Patents
Internal tensioning clamp of lathe Download PDFInfo
- Publication number
- CN113770404B CN113770404B CN202111183216.2A CN202111183216A CN113770404B CN 113770404 B CN113770404 B CN 113770404B CN 202111183216 A CN202111183216 A CN 202111183216A CN 113770404 B CN113770404 B CN 113770404B
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- tensioning
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- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims description 6
- 239000007779 soft material Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 polytetrafluoroethylene rings Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- 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
- B23B31/16158—Jaws movement actuated by coaxial conical surfaces
-
- 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
- B23B31/16158—Jaws movement actuated by coaxial conical surfaces
- B23B31/16179—Jaws movement actuated by coaxial conical surfaces using fluid-pressure means to actuate the gripping means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses an internal tensioning clamp of a lathe, which comprises a clamping base, a mounting frame, a tensioning block, a tensioning mandrel and a tensioning driving mechanism, wherein the clamping base is provided with a clamping groove; the mounting frame comprises a connecting flange plate and a fixed ring, a plurality of connecting plates are arranged between the connecting flange plate and the fixed ring, a tensioning block base is arranged between two adjacent connecting plates, and the outer side of each tensioning block base is respectively provided with a tensioning block; the tensioning mandrel is conical, and the small-diameter end of the tensioning mandrel extends into the conical hole from the large-diameter end of the conical hole; an end cover is arranged at one end of the mounting frame, which is far away from the clamping base, and the tensioning driving mechanism is positioned between the end cover and the tensioning mandrel. The clamping device effectively solves the problem of clamping deformation of the ultrathin annular part made of soft materials.
Description
Technical Field
The invention relates to the field of lathe positioning fixtures, in particular to an internal tensioning fixture for an ultrathin annular part.
Background
At present, a three-jaw chuck is generally adopted for clamping when a part is machined on a lathe, but for soft materials and ultrathin annular parts (such as polytetrafluoroethylene rings and copper rings), the three-jaw chuck can cause serious deformation of the part when used for clamping, so that the machined part cannot meet the requirements.
The traditional internal tension mechanism has the advantages that the tension sleeve is integrated, the tension mandrel is axially fed during working, and the tension sleeve is pushed to elastically expand outwards through the matched conical surface, so that the part is tensioned. When the tension sleeve elastically expands outwards, expansion conditions of the axial sections are different, expansion from the proximal end of the mandrel is larger, and tension force is large; the expansion of the far end is small, the tension force is small, and the radial tension force applied to the part is uneven; for soft materials and ultrathin annular parts, particularly parts with higher precision requirements have larger influence.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the internal tensioning clamp for the lathe, which can ensure that the clamping force of each radial part of the annular part is uniform and consistent, and prevent clamping deformation, thereby being suitable for processing soft material and ultrathin annular parts and improving the processing precision of the parts.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the internal tensioning clamp for the lathe is characterized by comprising a clamping base, a mounting frame, a tensioning block, a tensioning mandrel and a tensioning driving mechanism;
the mounting frame comprises a connecting flange plate and a fixed ring which are arranged on the same axis, the connecting flange plate is fixedly connected with the clamping base, a plurality of connecting plates are arranged between the connecting flange plate and the fixed ring, the connecting plates are uniformly distributed around the fixed ring, and two ends of the connecting plates are fixedly connected with the connecting flange plate and the fixed ring; a tensioning block base is arranged between two adjacent connecting plates, and the tensioning block base is connected with the connecting flange plate, the fixing ring and the connecting plates in a sliding fit manner and can move along the radial direction of the connecting flange plate; the inner side surface of each tensioning block base is an inclined surface, the section of each tensioning block base is arc-shaped, two ends of each tensioning block base are respectively provided with an arc-shaped groove, the arc-shaped grooves at the same end of each tensioning block base are positioned on the same circumference, the two ends of each tensioning block base are respectively connected through a pre-tightening elastic piece, the pre-tightening elastic pieces are positioned in the arc-shaped grooves, and in an initial state, under the action of the pre-tightening elastic pieces, the tensioning block bases are mutually closed to enable the inner side of the whole tensioning block base to form a conical hole, and the small diameter section of the conical hole is close to a connecting flange; the outer sides of the tensioning block bases are respectively provided with a tensioning block, and the tensioning blocks are fixedly connected with the tensioning block bases through connecting bolts and can move along with the tensioning blocks; the section of each tensioning block is arc-shaped, and the outer side surface of each tensioning block is positioned on the same cylindrical surface which coincides with the axial lead of the connecting flange plate;
the tensioning mandrel is conical, the taper of the tensioning mandrel is consistent with that of a conical hole formed in the inner side of the tensioning block base, and the small-diameter end of the tensioning mandrel extends into the conical hole from the large-diameter end of the conical hole; an end cover is arranged at one end of the mounting frame, which is far away from the clamping base, and is fixedly connected with the fixing ring, the tensioning driving mechanism is positioned between the end cover and the tensioning mandrel and is respectively connected with the end cover and the tensioning mandrel, the tensioning mandrel can be driven to axially move by the tensioning driving mechanism, and when the tensioning mandrel moves towards the clamping base, the tensioning block base can be extruded, so that the tensioning block base is pushed to radially and outwards move, and the tensioning block is driven to radially and outwards move.
In this scheme, because the hole that the tensioning piece base wholly forms is the bell mouth, the tensioning dabber is the toper that corresponds with it, and when the tensioning dabber moved under the effect of tensioning actuating mechanism, can promote the tensioning piece base along radial outside removal, and then drive the tensioning piece along radial synchronous outside removal to radially the annular part of cover on the tensioning piece radially rises tightly, and each tensioning piece is evenly unanimous to the radial force size that annular part applyed, thereby effectually solved soft material, ultra-thin annular part's clamping deformation's problem.
Further, the pre-tightening elastic piece adopts an annular spring or an elastic rubber ring; simple structure, low cost and better stability.
Preferably, the tensioning driving mechanism adopts a pneumatic device and comprises a cylinder body, a piston and a piston rod, wherein the cylinder body is fixedly connected with the end cover, one end of the cylinder body, which is close to the end cover, is provided with an air tap, and the air tap penetrates through the cylinder cover; the piston is positioned in the cylinder body and connected with the cylinder body in a sliding fit way, one end of the piston rod is connected with the piston, and the other end of the piston rod penetrates through the cylinder body and then is connected with the large-diameter end of the tensioning mandrel. The pneumatic device is used for pushing the tensioning mandrel to move, so that the control is facilitated.
Further, one end of the piston rod extending out of the cylinder body is fixedly connected with a power block, and the power block is connected with a connecting block through a screw; the small diameter end of the tensioning mandrel is provided with a tensioning screw rod which penetrates through the tensioning mandrel and then is connected with the connecting block, and the connecting block is tightly attached to the tensioning mandrel. Therefore, when the tensioning mandrel is pushed, the contact area is larger, the action effect is better, and when the tensioning mandrel is reset, the gas in the cylinder body can be discharged more quickly.
Further, a containing groove is formed in the position, corresponding to the cylinder body, of the large-diameter end of the tensioning mandrel, the connecting block and the power block are both located in the containing groove, and one end, far away from the end cover, of the cylinder body extends into the containing groove and is connected with the containing groove in a sliding fit mode. Therefore, the whole clamp has more compact structure and smaller volume.
Further, a reset spring is arranged between the small diameter end of the tensioning mandrel and the clamping base, and two ends of the reset spring are respectively connected with the tensioning mandrel and the clamping base. After the reset spring is arranged, the mandrel can be reset at a higher speed, so that the annular part can be taken out and installed more conveniently.
Further, an exhaust hole is further formed in the clamping base, so that the movement of the tensioning mandrel is smooth, and the phenomenon that the movement of the tensioning mandrel is blocked due to incapability of exhausting is avoided.
Further, a guide shaft is arranged at the small diameter end of the tensioning mandrel along the axial direction of the small diameter end, a guide groove is arranged on the clamping base corresponding to the guide shaft, one end of the guide shaft is fixedly connected with the tensioning mandrel, and the other end of the guide shaft extends into the guide groove and is connected with the guide groove in a sliding fit manner. Through setting up the guiding axle to can ensure the stability of tensioning dabber in the removal in-process, thereby further guarantee the stability and the uniformity of tensioning piece base and tensioning piece application of force to tensioning dabber in the removal in-process of tensioning dabber.
Further, an arc-shaped limit groove is further formed in the large-diameter end of the tensioning block base, a limit ring is arranged on the end cover corresponding to the limit groove, one end of the limit ring is fixedly connected with the end cover, and the other end of the limit ring extends into the limit groove, wherein the radial width of the limit groove along the limit groove is larger than the thickness of the limit ring. Thereby avoid the tight dabber of rising to rise under the extrusion in-process of tight piece base, prevent under the circumstances that pretension elastic component damages suddenly, cause tight piece base to break away from the mounting bracket.
Preferably, the tensioning driving mechanism adopts a linear motor, the linear motor is fixedly connected with the end cover, and a motor shaft of the linear motor is connected with the tensioning mandrel; the structure is simpler, and the control accuracy is higher.
Compared with the prior art, the invention has the following advantages:
(1) The tensioning mandrel is pushed to axially feed through the tensioning driving mechanism, the tensioning mandrel moves outwards in the radial direction of the tensioning block base and the tensioning blocks, so that the tensioning blocks radially feed, each tensioning block synchronously moves outwards, the contact surface formed by the outer side surfaces of the tensioning blocks is attached to the inner side surface of the annular part, radial clamping force borne by the annular part is uniformly distributed when the annular part is tensioned, and therefore the clamping deformation problem of soft materials and ultrathin annular parts can be effectively solved, the positioning precision of the annular part is effectively improved, and the machining precision of the annular part is greatly improved.
(2) When the clamp is used, the tensioning blocks with different sizes are selected and replaced according to the annular parts with different inner diameters, so that the applicability of the whole clamp is enhanced; meanwhile, before clamping the part, the outer surface (namely the clamping surface) of the tensioning block can be finished, so that the whole clamp has higher positioning precision.
Drawings
FIG. 1 is a schematic view of the structure of a tensioning clamp in a lathe;
fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is an enlarged view of a portion a in fig. 2.
Fig. 4 is a schematic structural view of the mounting frame.
Fig. 5 is a schematic diagram of an assembly structure of a tensioning block and a tensioning block base.
Fig. 6 is a schematic diagram of an assembly structure of the tensioning mandrel and the starting device.
The clamping base 1, the tensioning block 2, the tensioning mandrel 3, the connecting flange 4, the fixing ring 5, the connecting plate 6, the tensioning base 7, the pre-tensioning elastic piece 8, the end cover 9, the cylinder body 10, the piston 11, the piston rod 12, the air tap 13, the power block 14, the connecting block 15, the tensioning screw 16, the return spring 17, the exhaust hole 18, the guide shaft 19, the limiting groove 20, the limiting ring 21 and the annular part 22.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1: referring to fig. 1-6, an internal tensioning clamp of a lathe comprises a clamping base 1, a mounting frame, a tensioning block 2, a tensioning mandrel 3 and a tensioning driving mechanism.
The mounting frame comprises a connecting flange plate 4 and a fixing ring 5 which are arranged on the same axis, and the apertures of inner holes of the connecting flange plate 4 and the fixing ring 5 are consistent during processing; the connecting flange plate 4 is fixedly connected with the clamping base 1, a plurality of connecting plates 6 are arranged between the connecting flange plate 4 and the fixed ring 5, the connecting plates 6 are uniformly distributed around the fixed ring 5 in a circle, two ends of each connecting plate are fixedly connected with the connecting flange plate 4 and the fixed ring 5, and the plane where the connecting plates 6 are located passes through the axial lead of the fixed ring 5. The tensioning block bases 7 are arranged between two adjacent connecting plates 6, preferably, 8 connecting plates 6 are arranged, and correspondingly, 8 tensioning block bases 7 are arranged, so that the annular part 22 can be better tensioned and clamped. The tensioning block base 7 is connected with the connecting flange 4, the fixing ring 5 and the connecting plate 6 in a sliding fit manner and can move along the radial direction of the connecting flange 4. The inner side surface of the tensioning block base 7 is an inclined surface, and the section of the tensioning block base is arc-shaped; the two ends of each tensioning block base 7 are respectively provided with an arc-shaped groove, the arc-shaped grooves at the same end of each tensioning block base 7 are positioned on the same circumference, and the two ends of each tensioning block base 7 are respectively connected through a pre-tensioning elastic piece 8; the pre-tightening elastic piece 8 is located in the arc-shaped groove, under the action of the pre-tightening elastic piece 8 in an initial state, the tensioning block bases 7 are mutually close to each other, a conical hole is formed in the inner side of the tensioning block base 7, and the small-diameter section of the conical hole is close to the connecting flange 4. In implementation, the pre-tightening elastic piece 8 adopts an annular spring or an elastic rubber ring; simple structure, low cost and better stability.
The outer sides of the tensioning block bases 7 are respectively provided with a tensioning block 2, and the tensioning blocks 2 are fixedly connected with the tensioning block bases 7 through connecting bolts and can move along with the tensioning blocks 2; the section of each tensioning block 2 is arc-shaped, and the outer side surface of each tensioning block 2 is positioned on the same cylindrical surface which coincides with the axis of the connecting flange 4. In the actual manufacturing process, a clamping groove is formed in the outer side face of the tensioning block base 7, a protruding block is arranged at the inner side of the tensioning block 2 and corresponds to the clamping groove, the protruding block is clamped with the clamping groove and is locked and fixed through a connecting bolt, so that the tensioning block 2 is more convenient to disassemble and assemble, the tensioning blocks 2 with different sizes are selected and replaced according to annular parts 22 with different inner diameters, and the applicability of the whole clamp is enhanced; meanwhile, before clamping the part, the outer surface (namely the clamping surface) of the tensioning block 2 can be finished, so that the whole clamp has higher positioning precision.
The tensioning mandrel 3 is conical, the taper of the tensioning mandrel is consistent with that of a conical hole formed in the inner side of the tensioning block base 7, and the small-diameter end of the tensioning mandrel 3 extends into the conical hole from the large-diameter end of the conical hole. An end cover 9 is arranged at one end of the mounting frame far away from the clamping base 1, the end cover 9 is fixedly connected with the fixed ring 5, and the tensioning driving mechanism is positioned between the end cover 9 and the tensioning mandrel 3 and is respectively connected with the end cover 9 and the tensioning mandrel 3, and the tensioning mandrel 3 can be driven to axially move along the tensioning driving mechanism through the tensioning driving mechanism. When the tensioning mandrel 3 moves towards the clamping base 1, the tensioning block base 7 can be extruded, so that the tensioning block base 7 is pushed to move outwards in the radial direction, and the tensioning block 2 is driven to move outwards in the radial direction. The clamping base 1 is further provided with an exhaust hole 18, so that the movement of the tensioning mandrel 3 is smooth, and the phenomenon that the movement of the tensioning mandrel 3 is blocked due to incapability of exhausting is avoided. When in implementation, a reset spring 17 is arranged between the small diameter end of the tensioning mandrel 3 and the clamping base 1, and two ends of the reset spring 17 are respectively connected with the tensioning mandrel 3 and the clamping base 1; after the reset spring 17 is arranged, the mandrel can be reset at a higher speed, so that the annular part 22 can be taken out and installed more conveniently; in the working process, when the tensioning mandrel 3 moves towards the clamping base 1, the return spring 17 is in a compressed state; after the part processing is finished, the tensioning mandrel 3 returns rapidly under the reaction force of the return spring 17, so that the part can be rapidly unloaded.
In specific implementation, the tensioning driving mechanism adopts a pneumatic device and comprises a cylinder body 10, a piston 11 and a piston rod 12, wherein the cylinder body 10 is fixedly connected with the end cover 9, one end, close to the end cover 9, of the cylinder body 10 is provided with an air tap 13, and the air tap 13 penetrates through the cylinder cover. The piston 11 is positioned in the cylinder body 10 and is connected with the cylinder body 10 in a sliding fit manner, one end of the piston rod 12 is connected with the piston 11, and the other end of the piston rod passes through the cylinder body 10 and is connected with the large-diameter end of the tensioning mandrel 3; the pneumatic device pushes the tensioning mandrel 3 to move, so that the control is facilitated. Wherein, the end of the piston rod 12 extending out of the cylinder body 10 is fixedly connected with a power block 14, and the power block 14 is connected with a connecting block 15 through a screw; a tensioning screw 16 is arranged at the small diameter end of the tensioning mandrel 3, and the tensioning screw 16 penetrates through the tensioning mandrel 3 and then is connected with the connecting block 15, so that the connecting block 15 is tightly attached to the tensioning mandrel 3. Thus, when the tensioning mandrel 3 is pushed, the contact area is larger, the action effect is better, and when the tensioning mandrel 3 is reset, the gas in the cylinder body 10 can be discharged more quickly. The large diameter end of the tensioning mandrel 3 is provided with a containing groove corresponding to the cylinder body 10, the connecting block 15 and the power block 14 are both positioned in the containing groove, and one end of the cylinder body 10 far away from the end cover 9 stretches into the containing groove and is connected with the containing groove in a sliding fit manner. Therefore, the whole clamp has more compact structure and smaller volume.
A guide shaft 19 is arranged at the small diameter end of the tensioning mandrel 3 along the axial direction of the small diameter end, a guide groove is arranged on the clamping base 1 corresponding to the guide shaft 19, one end of the guide shaft 19 is fixedly connected with the tensioning mandrel 3, and the other end of the guide shaft extends into the guide groove and is connected with the guide groove in a sliding fit manner. By arranging the guide shaft 19, the stability of the tensioning mandrel 3 in the moving process can be ensured, and the stability and consistency of force applied to the tensioning block base 7 and the tensioning block 2 in the moving process of the tensioning mandrel 3 are further ensured. Wherein the exhaust hole 18 is in communication with the guide groove.
The large-diameter end of the tensioning block base 7 is also provided with an arc-shaped limit groove 20, a limit ring 21 is arranged on the end cover 9 corresponding to the limit groove 20, one end of the limit ring 21 is fixedly connected with the end cover 9, and the other end of the limit ring extends into the limit groove 20, wherein the radial width of the limit groove 20 is larger than the thickness of the limit ring 21. Thereby avoiding the situation that the tensioning block base 7 is separated from the mounting frame under the condition that the pre-tensioning elastic piece 8 is prevented from being suddenly damaged in the extrusion process of the tensioning mandrel 3 to the tensioning block base 7.
When the fixture is used, the clamping base 1 is clamped on a lathe spindle through a three-jaw chuck and rotates along with the spindle, gas is filled into the cylinder body 10 through the air tap 13, the piston 11 and the piston rod 12 are pushed to axially feed, and the tensioning mandrel 3 is pushed to axially feed. The radial component force action of the conical surface is matched with the tensioning core shaft 3 and the tensioning block base 7, so that the tensioning block base 7 and the tensioning blocks 2 are radially fed, each tensioning block 2 synchronously moves outwards and is tensioned, the contact surface formed by the outer surface of each tensioning block 2 can be completely attached to the inner side surface of the annular part 22, the radial force applied by each tensioning block 2 to the annular part 22 is uniformly consistent when the annular part 22 is tensioned, and the radial tensioning force applied to the part is uniformly distributed; and the clamping force of the part is adjusted by adjusting the pressure of the gas. After the annular part 22 is machined, the pressure gas is quickly released through the air tap 13, and under the reaction of the return spring 17, the tensioning mandrel 3 returns to the original position, so that the part is quickly unloaded, and the part is convenient to detach and replace.
In this scheme, because the hole that tensioning piece base 7 wholly forms is the bell mouth, tensioning dabber 3 is the toper that corresponds with it, and when tensioning dabber 3 moved under tensioning actuating mechanism's effect, can promote tensioning piece base 7 along radial outside removal, and then drive tensioning piece 2 along radial synchronous outside removal, thereby radially tensioning annular part 22 of cover on tensioning piece 2, and the radial force size that each tensioning piece 2 applyed annular part 22 is even unanimous, thereby effectually solved soft material, ultra-thin annular part 22's clamping problem of deformation.
Embodiment 2, unlike embodiment 1, the tensioning driving mechanism adopts a linear motor, the linear motor is fixedly connected with the end cover, and a motor shaft of the linear motor is connected with the tensioning mandrel; preferably, a stepping motor or a servo motor is adopted, so that the structure is simpler, and the control accuracy is higher.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the technical solution, and those skilled in the art should understand that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the present invention, and all such modifications and equivalents are included in the scope of the claims.
Claims (8)
1. The internal tensioning clamp for the lathe is characterized by comprising a clamping base, a mounting frame, a tensioning block, a tensioning mandrel and a tensioning driving mechanism; the clamping base is also provided with an exhaust hole;
the mounting frame comprises a connecting flange plate and a fixed ring which are arranged on the same axis, the connecting flange plate is fixedly connected with the clamping base, a plurality of connecting plates are arranged between the connecting flange plate and the fixed ring, the connecting plates are uniformly distributed around the fixed ring, and two ends of the connecting plates are respectively fixedly connected with the connecting flange plate and the fixed ring; a tensioning block base is arranged between two adjacent connecting plates, and the tensioning block base is connected with the connecting flange plate, the fixing ring and the connecting plates in a sliding fit manner and can move along the radial direction of the connecting flange plate; the inner side surface of each tensioning block base is an inclined surface, the section of each tensioning block base is arc-shaped, two ends of each tensioning block base are respectively provided with an arc-shaped groove, the arc-shaped grooves at the same end of each tensioning block base are positioned on the same circumference, two ends of each tensioning block base are respectively connected through a pre-tensioning elastic piece, the pre-tensioning elastic pieces are positioned in the arc-shaped grooves, and the pre-tensioning elastic pieces adopt annular springs or elastic rubber rings; in the initial state, under the action of the pre-tightening elastic piece, the bases of the tensioning blocks are mutually closed to enable the inner side of the whole base of the tensioning block to form a conical hole, and the small diameter section of the conical hole is close to the connecting flange plate; the outer sides of the tensioning block bases are respectively provided with a tensioning block, and the tensioning blocks are fixedly connected with the tensioning block bases through connecting bolts and can move along with the tensioning blocks; the section of each tensioning block is arc-shaped, and the outer side surface of each tensioning block is positioned on the same cylindrical surface which coincides with the axial lead of the connecting flange plate;
the tensioning mandrel is conical, the taper of the tensioning mandrel is consistent with that of a conical hole formed in the inner side of the tensioning block base, and the small-diameter end of the tensioning mandrel extends into the conical hole from the large-diameter end of the conical hole; an end cover is arranged at one end of the mounting frame, which is far away from the clamping base, and is fixedly connected with the fixing ring, the tensioning driving mechanism is positioned between the end cover and the tensioning mandrel and is respectively connected with the end cover and the tensioning mandrel, the tensioning mandrel can be driven to axially move by the tensioning driving mechanism, and when the tensioning mandrel moves towards the clamping base, the tensioning block base can be extruded, so that the tensioning block base is pushed to radially and outwards move, and the tensioning block is driven to radially and outwards move.
2. The in-lathe tensioning clamp according to claim 1, wherein: the tensioning driving mechanism adopts a pneumatic device and comprises a cylinder body, a piston and a piston rod, wherein the cylinder body is fixedly connected with the end cover, one end of the cylinder body, which is close to the end cover, is provided with an air tap, and the air tap penetrates through the cylinder cover; the piston is positioned in the cylinder body and connected with the cylinder body in a sliding fit way, one end of the piston rod is connected with the piston, and the other end of the piston rod penetrates through the cylinder body and then is connected with the large-diameter end of the tensioning mandrel.
3. The in-lathe tensioning clamp according to claim 2, wherein: one end of the piston rod extending out of the cylinder body is fixedly connected with a power block, and the power block is connected with a connecting block through a screw; the small diameter end of the tensioning mandrel is provided with a tensioning screw rod which penetrates through the tensioning mandrel and then is connected with the connecting block, and the connecting block is tightly attached to the tensioning mandrel.
4. A lathe inner tensioning clamp as defined in claim 3, wherein: the large diameter end of the tensioning mandrel is provided with a containing groove corresponding to the cylinder body, the connecting block and the power block are both positioned in the containing groove, and one end of the cylinder body, which is far away from the end cover, extends into the containing groove and is connected with the containing groove in a sliding fit manner.
5. The in-lathe tensioning clamp according to claim 1, wherein: a reset spring is arranged between the small diameter end of the tensioning mandrel and the clamping base, and two ends of the reset spring are respectively connected with the tensioning mandrel and the clamping base.
6. The in-lathe tensioning clamp according to claim 1, wherein: a guide shaft is arranged at the small diameter end of the tensioning mandrel along the axial direction of the small diameter end, a guide groove is arranged on the clamping base corresponding to the guide shaft, one end of the guide shaft is fixedly connected with the tensioning mandrel, and the other end of the guide shaft extends into the guide groove and is connected with the guide groove in a sliding fit manner.
7. The in-lathe tensioning clamp according to claim 1, wherein: the large-diameter end of the tensioning block base is also provided with an arc-shaped limit groove, a limit ring is arranged on the end cover corresponding to the limit groove, one end of the limit ring is fixedly connected with the end cover, and the other end of the limit ring extends into the limit groove, wherein the radial width of the limit groove is larger than the thickness of the limit ring.
8. The in-lathe tensioning clamp according to claim 1, wherein: the tensioning driving mechanism adopts a linear motor, the linear motor is fixedly connected with the end cover, and a motor shaft of the linear motor is connected with the tensioning mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183216.2A CN113770404B (en) | 2021-10-11 | 2021-10-11 | Internal tensioning clamp of lathe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183216.2A CN113770404B (en) | 2021-10-11 | 2021-10-11 | Internal tensioning clamp of lathe |
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| CN113770404A CN113770404A (en) | 2021-12-10 |
| CN113770404B true CN113770404B (en) | 2024-03-29 |
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| CN114346937B (en) * | 2021-12-27 | 2024-02-27 | 日善电脑配件(嘉善)有限公司 | Clamping mechanism and clamping method |
| CN114505645B (en) * | 2022-04-20 | 2022-07-26 | 杭州泰尚智能装备有限公司 | Positioning clamping slewing mechanism for welding and operation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB491699A (en) * | 1938-01-22 | 1938-09-07 | James Edward Connor | Improvements in chucks |
| DE1477655A1 (en) * | 1963-04-19 | 1969-06-04 | Pittler Ag Maschf | Method for clamping hollow workpieces, in particular thin-walled rings, on a lathe and device for carrying out the method |
| CN203900531U (en) * | 2014-04-23 | 2014-10-29 | 河北宣化工程机械股份有限公司 | Lathe fixture |
| CN207577458U (en) * | 2017-12-15 | 2018-07-06 | 黄冈师范学院 | A kind of lathe process thin walled cylinder body special fixture |
| CN109396907A (en) * | 2018-11-05 | 2019-03-01 | 刘剑 | Hydraulic expansion device |
| CN210498424U (en) * | 2019-08-07 | 2020-05-12 | 江苏新贝斯特智能制造有限公司 | Hydraulic chuck |
| CN211276568U (en) * | 2019-11-20 | 2020-08-18 | 中海油能源发展股份有限公司 | Tensioning tool for turning impeller machining |
| CN215698093U (en) * | 2021-10-11 | 2022-02-01 | 重庆华渝电气集团有限公司 | Internal expanding clamp for lathe |
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2021
- 2021-10-11 CN CN202111183216.2A patent/CN113770404B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB491699A (en) * | 1938-01-22 | 1938-09-07 | James Edward Connor | Improvements in chucks |
| DE1477655A1 (en) * | 1963-04-19 | 1969-06-04 | Pittler Ag Maschf | Method for clamping hollow workpieces, in particular thin-walled rings, on a lathe and device for carrying out the method |
| CN203900531U (en) * | 2014-04-23 | 2014-10-29 | 河北宣化工程机械股份有限公司 | Lathe fixture |
| CN207577458U (en) * | 2017-12-15 | 2018-07-06 | 黄冈师范学院 | A kind of lathe process thin walled cylinder body special fixture |
| CN109396907A (en) * | 2018-11-05 | 2019-03-01 | 刘剑 | Hydraulic expansion device |
| CN210498424U (en) * | 2019-08-07 | 2020-05-12 | 江苏新贝斯特智能制造有限公司 | Hydraulic chuck |
| CN211276568U (en) * | 2019-11-20 | 2020-08-18 | 中海油能源发展股份有限公司 | Tensioning tool for turning impeller machining |
| CN215698093U (en) * | 2021-10-11 | 2022-02-01 | 重庆华渝电气集团有限公司 | Internal expanding clamp for lathe |
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|---|---|
| CN113770404A (en) | 2021-12-10 |
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