CN114769644A - Frock clamp and turning lathe - Google Patents

Abstract

The invention relates to a tool clamp and a turning machine tool. The tooling fixture comprises a fixture base, a positioning tensioning mechanism and a circumferential positioning mechanism. The fixture base is used for being installed on the transmission shaft and is provided with a supporting seat. The positioning and tensioning mechanism is arranged on the seat surface of the supporting seat and used for tensioning the workpiece. The circumferential positioning mechanism is arranged on one side of the positioning and tensioning mechanism and comprises a second positioning seat, and the second positioning seat can be arranged on the seat surface of the supporting seat in a floating manner. The second positioning seat is provided with a positioning groove used for being matched with the fork shaft of the workpiece in a positioning mode, and the width of the positioning groove is gradually increased along the direction far away from the seat surface of the supporting seat. Therefore, the second positioning seat has different floating strokes in the direction away from the supporting seat due to different dimensional tolerances of the fork shafts, so that the fork shafts with different dimensional tolerances can be correspondingly positioned at different depth positions of the positioning grooves, the positioning of the workpiece is accurate and reliable, and the circumferential indexing accuracy of the workpiece can be ensured.

Description

Fixtures and turning machines

technical field

The invention relates to the technical field of turning machine tool equipment, in particular to a tooling fixture and a turning machine tool.

Background technique

The trigeminal shaft part is a small space three-axis precision part. When it needs to be processed, the trigeminal shaft part is clamped on the grinding machine or turning machine through the fixture. However, common fixtures have poor positioning reliability for the trident shaft parts, and cannot guarantee the accuracy of the trident shaft axial indexing.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a fixture and a turning machine tool, which can ensure accurate and reliable positioning of the workpiece, and can also ensure the accuracy of the circumferential indexing of the workpiece.

A tooling fixture, comprising:

a clamp base, the clamp base is used to be installed on the transmission shaft, and the seat surface of the clamp base is provided with a support seat;

a positioning and tightening mechanism, the positioning and tightening mechanism is used for tightening the workpiece, and the positioning and tightening mechanism is installed on the seat surface of the support seat; and

A circumferential positioning mechanism, the circumferential positioning mechanism is provided on one side of the positioning and tensioning mechanism, and the circumferential positioning mechanism includes a second positioning seat, and the second positioning seat can be floatingly mounted on the support seat The second positioning seat is provided with a positioning groove for positioning and matching with the fork shaft of the workpiece, and the width of the positioning groove gradually increases along the direction away from the seat surface of the support seat.

In one embodiment, the circumferential positioning mechanism further includes an elastic support component, the elastic support component is mounted on the support seat, the elastic support component is connected with the second positioning seat, and is used to drive the The second positioning seat floats toward or away from the seat surface of the support seat.

In one embodiment, the seat surface of the support base is provided with a through hole; the elastic support component includes a fixing sleeve and an ejector, and the fixing sleeve is fixed to a position of the support base away from the second positioning base. On one side, the fixing sleeve is provided with an elastic piece, and the ejecting piece is partially arranged in the fixing sleeve. One end of the ejecting piece is connected with the elastic piece, and the other end passes through the through hole and is connected to the elastic piece. connected with the second positioning seat.

In one embodiment, the elastic support assembly further includes a guide sleeve adapted to the through hole, the guide sleeve is sleeved in the through hole, and the guide sleeve is sleeved outside the ejector , the ejector can move relative to the guide sleeve along the axial direction of the guide sleeve.

In one embodiment, the positioning and tensioning mechanism includes a first positioning seat, the first positioning seat includes a seat plate and a positioning column protruding from the seat plate, and an elastic expansion sleeve is provided on the outer casing of the positioning column ; The positioning and tensioning mechanism further includes a tensioning assembly, which is used to drive the elastic expansion sleeve to expand and contract.

In one embodiment, the positioning column is provided with a first through hole, and the support base is correspondingly provided with a second through hole in communication with the first through hole; the tensioning assembly includes a tensioning cone pin, the tensioning The tight taper pin includes a pin rod and a conical head arranged at the end of the pin rod, and the end of the pin rod away from the conical head passes through the first through hole and the second through hole and extends to A side of the support seat away from the first positioning seat, and a tension nut is threadedly connected to one end of the pin rod away from the conical head.

In one embodiment, the tooling fixture further includes a pressing component, the pressing component includes a pressing block mounted on the fixture base, the pressing block is arranged opposite to the positioning and tensioning mechanism, and is used for It is used to press the workpiece on the positioning and tensioning mechanism.

In one embodiment, the pressing assembly further includes a pressing plate mounted on the fixture base, and the pressing block is mounted on a side of the pressing plate facing the first positioning seat through a pressing member; the The pressing plate is provided with a threaded hole; the pressing piece includes an anti-backlash nut and a pressing bolt, the pressing bolt is penetrated in the threaded hole and is connected and matched with the threaded hole; the anti-backlashing nut The screw is connected to the pressing bolt, and is tightly matched with the side of the pressing plate away from the pressing block.

In one embodiment, a balance correction hole for a balance correction rod to pass through is provided in the middle of the fixture base; the tooling fixture further includes a balance block, and the balance block is arranged on the seat surface of the fixture base to The jig can be balanced while rotating.

A turning machine tool includes a machine tool body and the tooling fixture, the machine tool body includes a transmission shaft, and the fixture base is mounted on the transmission shaft and can rotate with the transmission shaft.

The above-mentioned tooling fixture and turning machine tool clamp the workpiece in the positioning and tightening mechanism; at the same time, the fork shaft of the workpiece is positioned and matched with the positioning groove to realize the circumferential positioning of the workpiece, so that the workpiece can be stably and reliably tightened, so that the tooling fixture can be tightened stably and reliably. Can be applied to turning machines. In the process of positioning the fork shafts, due to the difference in size of each fork shaft, the second positioning seat is floatingly installed on the support seat, and the width of the positioning groove of the second positioning seat is along the direction away from the seat surface of the support seat Gradually increase, so that the stroke of the second positioning seat floating in the direction away from the support seat is different due to the difference in the dimensional tolerance of the fork shaft, so that the fork shafts with different dimensional tolerances can be positioned at different depth positions of the positioning groove, ensuring accurate and reliable workpiece positioning. , and can also ensure the accuracy of the workpiece circumferential indexing.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of a fixture according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the fixture shown in FIG. 1 from another perspective;

Fig. 3 is the structural representation of the positioning and tightening mechanism of the fixture shown in Fig. 1;

FIG. 4 is a schematic structural diagram of the second positioning structure of the fixture shown in FIG. 1 .

Reference number description: 10, fixture base; 11, support seat; 12, balance correction hole; 13, balance block; 20, positioning and tensioning mechanism; 21, first positioning seat; 211, seat plate; 2111, positioning block; 212, positioning column; 22, elastic expansion sleeve; 23, tension assembly; 231, tension taper pin; 2311, pin rod; 2312, conical head; 232, tension nut; 30, circumferential positioning mechanism; 31 311, base; 312, positioning groove body; 3121, positioning groove; 32, elastic support assembly; 321, fixed sleeve; 322, ejector; 323, guide sleeve; 40, pressing assembly; 41, pressing plate; 42, pressing block; 43, pressing piece; 431, pressing bolt; 432, anti-backlash nut; 44, mounting seat; 50, workpiece; 51, fork shaft.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

Referring to FIGS. 1 and 2 , a tooling fixture according to an embodiment of the present invention includes a fixture base 10 , a positioning and tensioning mechanism 20 and a circumferential positioning mechanism 30 . The clamp base 10 is used for being installed on the transmission shaft, and the seat surface of the clamp base 10 is provided with a support seat 11 . The positioning and tensioning mechanism 20 is installed on the seat surface of the support base 11 for tensioning the workpiece 50 . The circumferential positioning mechanism 30 is disposed on one side of the positioning and tensioning mechanism 20 . The circumferential positioning mechanism 30 includes a second positioning seat 31 , which can be mounted on the seat surface of the support seat 11 in a floating manner. The second positioning seat 31 is provided with a positioning groove 3121 for positioning and cooperating with the fork shaft 51 of the workpiece 50 .

It should be noted that the fact that the second positioning seat 31 can be mounted on the supporting seat 11 in a floating manner means that the second positioning seat 31 can move in a direction close to or away from the seat surface of the supporting seat 11 .

Optionally, the above-mentioned workpiece is a triaxial fork part. Of course, in other embodiments, the workpiece can also be other parts with fork shafts.

The above-mentioned fixture, the workpiece 50 is clamped in the positioning and tensioning mechanism 20; at the same time, the fork shaft 51 of the workpiece 50 is positioned and matched with the positioning groove 3121 to realize the circumferential positioning of the workpiece 50, so that the workpiece 50 can be stably and reliably tensioned, Make the fixture suitable for turning machine tools. In the process of positioning the fork shafts 51 , due to the difference in size of each fork shaft 51 , the second positioning seat 31 is floatingly installed on the support base 11 , and the width of the positioning groove 3121 of the second positioning seat 31 is far away from The direction of the seat surface of the support seat 11 is gradually increased, so that the second positioning seat 31 has different floating strokes in the direction away from the support seat 11 due to the different dimensional tolerances of the fork shaft 51, so that the fork shafts 51 with different dimensional tolerances can be positioned at the corresponding position. The different depth positions of the grooves 3121 can ensure accurate and reliable positioning of the workpiece 50, and can also ensure the accuracy of the circumferential indexing of the workpiece 50.

In this embodiment, referring to FIG. 1 and FIG. 2 , the bottom of the positioning groove 3121 is a flat surface, and the groove wall of the positioning groove 3121 is an inclined surface inclined outward. Specifically, the groove wall of the positioning groove 3121 includes an opposite first groove wall and a second groove wall, the first groove wall is inclined from the groove bottom to the direction away from the second groove wall, and the second groove wall The direction of the groove wall is inclined. Of course, in other embodiments, the cross section of the positioning groove 3121 can also be V-shaped.

In one embodiment, referring to FIG. 2 and FIG. 4 , the second positioning seat 31 includes a base 311 and a positioning groove body 312 , the base 311 is provided with an assembly groove adapted to the positioning groove body 312 , and the positioning groove body 312 is provided in the The positioning groove body 312 is detachably mounted on the base 311 through the mounting member. Optionally, the mounting member is a screw, a bolt, or the like. In this way, the groove wall of the assembly groove can limit the positioning groove body 312 to limit the positioning groove body 312 in the assembly groove, and the positioning groove body 312 is installed on the base 311 through the mounting member, so that the positioning groove body 312 can be fixed to the base 311. The body 312 is firmly and reliably mounted on the base 311 . In addition, the positioning groove body 312 is detachably installed on the base 311 through the mounting member. If the positioning groove body 312 is worn, etc., the positioning groove body 312 can be easily removed from the base 311 for replacement.

In one embodiment, referring to FIGS. 2 and 4 , the circumferential positioning mechanism 30 further includes an elastic support component 32 , and the elastic support component 32 is installed on the support base 11 . The elastic support assembly 32 is connected with the second positioning base 31 for driving the second positioning base 31 to move toward or away from the seat surface of the support base 11 . The workpiece 50 is clamped on the first positioning seat 21 , and the fork shaft 51 is located just above the positioning groove 3121 . The second positioning seat 31 moves toward the direction close to the fork shaft 51 under the action of the elastic support assembly 32 until the fork shaft 51 is positioned and matched with the positioning groove 3121 .

Further, referring to FIG. 4 , there are at least two elastic support components 32 , and the at least two elastic support components 32 are respectively disposed on both sides of the positioning groove 3121 . In this way, the floating stability of the second positioning seat 31 can be improved, thereby ensuring the reliability of the circumferential positioning of the workpiece 50 by the second positioning seat 31 . In this embodiment, there are two elastic supporting components 32 , and the two elastic supporting components 32 are respectively disposed on both sides of the positioning groove 3121 .

Further, referring to FIG. 2 and FIG. 4 , the seat surface of the support base 11 is provided with a through hole. The elastic support assembly 32 includes a fixing sleeve 321 and an ejector 322 . The fixing sleeve 321 is fixed on the side of the support base 11 away from the second positioning base 31 , and the fixing sleeve 321 is provided with an elastic member. The ejecting member 322 is partially disposed in the fixing sleeve 321 , one end of the ejecting member 322 is connected with the elastic member, and the other end passes through the through hole and is connected with the second positioning seat 31 . Specifically, one end of the ejecting member 322 away from the elastic member is connected to the base 311 of the second positioning seat 31 . The workpiece 50 is clamped on the first positioning seat 21 , and the fork shaft 51 is located just above the positioning groove 3121 . According to the different dimensional tolerances of the fork shaft 51, the stroke of the ejector 322 in the direction close to the fork shaft 51 is different under the action of the elastic member, and then pushes the second positioning seat 31 to move in the direction close to the fork shaft 51 until the fork shaft 51 is positioned and matched with the positioning groove 3121.

Further, referring to FIG. 2 and FIG. 4 , the elastic support assembly 32 further includes a guide sleeve 323 adapted to the through hole, the guide sleeve 323 is arranged in the through hole, and the guide sleeve 323 is sleeved outside the ejector 322, and the ejector The outgoing piece 322 can move relative to the guide sleeve 323 along the axial direction of the guide sleeve 323 . In this way, the guide sleeve 323 can play a guiding role, so that the movement of the ejector 322 is guided, and the second positioning seat 31 can be moved toward or away from the support seat 11 under the driving of the ejector 322. Circumferential positioning of the workpiece 50 is better.

In one embodiment, referring to FIG. 1 , FIG. 2 and FIG. 3 , the positioning and tensioning mechanism 20 includes a first positioning seat 21 , and the first positioning seat 21 includes a seat plate 211 and a positioning column 212 protruding from the seat plate 211 . An elastic expansion sleeve 22 is provided on the outer casing of the column 212 . The positioning and tensioning mechanism 20 further includes a tensioning component 23, and the tensioning component 23 is used to drive the elastic expansion sleeve 22 to expand and contract. When the elastic expansion sleeve 22 is in a contracted state, the workpiece 50 is sleeved outside the elastic expansion sleeve 22, and then the elastic expansion sleeve 22 is driven to expand outward by the tensioning assembly 23, so that the elastic expansion sleeve 22 and the inner hole of the workpiece 50 are in contact with each other. The hole wall is tightly matched to realize the positioning and tightening of the workpiece 50 axis. After the workpiece 50 is processed, the elastic sleeve 22 is driven to shrink inward by the tensioning assembly 23, so that the elastic sleeve 22 is separated from the hole wall of the inner hole of the workpiece 50, so that the workpiece 50 can be removed from the positioning post 212. .

Further, the positioning column 212 is provided with a first through hole, the support base 11 is provided with a second through hole correspondingly, and the first through hole is communicated with the second through hole. Optionally, the first perforation is disposed opposite to the second perforation. The tensioning assembly 23 includes a tensioning cone pin 231, the tensioning cone pin 231 includes a pin rod 2311 and a conical head 2312 arranged at the end of the pin rod 2311, the end of the pin rod 2311 away from the conical head 2312 passes through the first The through hole and the second through hole extend to the side of the support base 11 away from the first positioning base 21 , and a tightening nut 232 is threadedly connected to one end of the pin 2311 away from the conical head 2312 . Optionally, the diameter of the tapered head 2312 gradually increases in the direction away from the pin 2311 . After the workpiece 50 is sleeved on the positioning column 212, the tightening nut 232 is rotated, and the tightening nut 232 drives the pin rod 2311 to move downward along its axial direction, thereby driving the conical head 2312 to move in the direction close to the positioning column 212, so as to The elastic expansion sleeve 22 is expanded outward, and the elastic expansion sleeve 22 is tightly matched with the hole wall of the inner hole of the workpiece 50 . After the workpiece 50 is processed, the tightening nut 232 is reversely rotated, and the tightening nut 232 drives the pin rod 2311 to move upward along its axial direction, thereby driving the conical head 2312 to move away from the positioning post 212, so as to increase the elasticity. The sleeve 22 shrinks inwardly, and the elastic expansion sleeve 22 is separated from the hole wall of the inner hole of the workpiece 50 .

It should be noted that the tightening nut 232 can only rotate in the circumferential direction of the pin rod 2311, and does not move axially.

Further, referring to FIG. 1 and FIG. 3 , a positioning block 2111 is also protruded from the plate surface of the seat plate 211 , and the positioning block 2111 is located on the side of the positioning block 2111 . During clamping, the workpiece 50 is partially sleeved outside the elastic expansion sleeve 22 , and external force acts on the workpiece 50 to push the workpiece 50 toward the seat plate 211 until the workpiece 50 collides with the positioning block 2111 . In this way, by setting the positioning block 2111, the positioning block 2111 plays a positioning role to ensure that the workpiece 50 is clamped in place. In addition, a positioning block 2111 is provided on the surface of the seat plate 211 , and there is a gap between the top of the positioning block 2111 and the surface of the seat plate 211 , so that fingers can be inserted in the gap to facilitate the removal of the workpiece 50 .

Further, referring to FIG. 3 , there are at least two positioning blocks 2111 , and the at least two positioning blocks 2111 are arranged at equal intervals along the circumferential direction of the positioning column 212 . In this way, the positioning blocks 2111 arranged at equal intervals along the circumferential direction of the positioning column 212 can better support the workpiece 50 and prevent the workpiece 50 from tilting under the action of an external force. In this embodiment, there are three positioning blocks 2111 , and the three positioning blocks 2111 are arranged at equal intervals along the circumferential direction of the positioning column 212 .

In one embodiment, referring to FIGS. 1 and 2 , the tooling fixture further includes a hold-down assembly 40 . The pressing assembly 40 includes a pressing block 42 mounted on the fixture base 10 . The pressing block 42 is disposed opposite to the first positioning seat 21 for pressing the workpiece 50 on the first positioning seat 21 . Due to the large turning force, the axial movement of the workpiece 50 may not be completely restricted by the pulling force of the elastic sleeve 22 alone. Therefore, in this embodiment, the workpiece 50 is pressed against the first positioning seat 21 by the pressing component 40 to achieve The purpose of fully clamping the workpiece 50 is to prevent the workpiece 50 from moving in its axial direction.

Further, referring to FIGS. 1 and 2 , the pressing assembly 40 further includes a pressing plate 41 mounted on the fixture base 10 , and the pressing block 42 is mounted on the side of the pressing plate 41 facing the first positioning seat 21 through the pressing member 43 . Specifically, the pressing plate 41 is provided with a threaded hole, and the pressing member 43 includes an anti-backlash nut 432 and a pressing bolt 431. The pressing bolt 431 is inserted into the threaded hole and is threadedly matched with the threaded hole; the anti-backlashing nut 432 is threaded It is connected to the pressing bolt 431 and is tightly fitted with the side of the pressing plate 41 away from the pressing block 42 . In this way, through the cooperation of the pressing bolt 431 and the anti-backlash nut 432 , the pressing block 42 can be firmly and reliably installed on the pressing plate 41 . In addition, by adjusting the pressing bolt 431 and the anti-backlash nut 432, the distance between the pressing block 42 and the first positioning seat 21 can be adjusted so as to be suitable for pressing workpieces 50 of different specifications.

Further, referring to FIGS. 1 and 2 , the pressing assembly 40 further includes a mounting seat 44 , and the mounting seat 44 is fixed to the fixture base 10 . One side of the mounting seat 44 is provided with two first lugs at intervals, and the other side is provided with two second lugs at intervals. One side of the pressing plate 41 is set between the two first lugs, and is mounted on the first lugs by the mounting piece; the other side of the pressing plate 41 is set between the two second lugs, and is mounted on the Second lug. In this way, the pressing plate 41 can be firmly and reliably installed on the fixture base 10 through the mounting seat 44 .

In one embodiment, referring to FIG. 1 , a balance correction hole 12 is provided in the middle of the seat surface of the fixture base 10 for the balance correction rod to pass through. Balance adjustment needs to be performed before the fixture is installed on the drive shaft of the turning machine, so in this embodiment, a balance correction hole 12 is provided in the middle of the seat surface of the fixture base 10, and the balance correction rod is passed through the balance correction during balance correction. After hole 12, put it on the balance bracket for balance correction. After the balance correction is complete, install the fixture to the drive shaft.

Optionally, the balance correction hole 12 is circular. Of course, in other embodiments, the balance correction hole 12 may also be of other shapes, which is not limited thereto.

In one embodiment, referring to FIG. 1 , the fixture further includes a balance block 13 , and the balance block 13 is arranged on the seat surface of the fixture base 10 , so that the fixture can maintain balance when rotating. It should be noted that the size and the setting position of the balance block 13 are calculated according to the mass of the tooling fixture up, down, left and right. In this way, if the fixture is irregular, a balance block 13 is provided on the fixture base 10 to prevent the fixture from swinging due to unbalanced gravity during rotation.

A turning machine tool according to an embodiment of the present invention includes a machine tool body and the fixture of any of the above-mentioned embodiments. The machine tool body includes a transmission shaft, and the fixture base 10 is mounted on the transmission shaft and can rotate with the transmission shaft.

In the above-mentioned turning machine tool, the workpiece 50 is clamped to the positioning and tensioning mechanism 20; at the same time, the fork shaft 51 of the workpiece 50 is positioned and matched with the positioning groove 3121 to realize the circumferential positioning of the workpiece 50, so that the workpiece 50 can be stably and reliably tensioned, Make the fixture suitable for turning machine tools. In the process of positioning the fork shafts 51 , due to the difference in size of each fork shaft 51 , the second positioning seat 31 is floatingly installed on the support base 11 , and the width of the positioning groove 3121 of the second positioning seat 31 is far away from The direction of the seat surface of the support seat 11 is gradually increased, so that the second positioning seat 31 has different floating strokes in the direction away from the support seat 11 due to the different dimensional tolerances of the fork shaft 51, so that the fork shafts 51 with different dimensional tolerances can be positioned at the corresponding position. The different depth positions of the grooves 3121 can ensure accurate and reliable positioning of the workpiece 50, and can also ensure the accuracy of the circumferential indexing of the workpiece 50.

Further, the turning machine tool further includes a turning tool, and the turning tool is used for turning the fork shaft 51 of the workpiece 50 .

In this embodiment, the turning machine tool processes the trident shaft parts, specifically the spherical surface of the triaxial shafts. In order to ensure the accurate positioning of the trident shaft parts, the clamping must be performed in the following order:

(1) Balance adjustment should be performed before installing the fixture to the drive shaft of the turning machine. When adjusting, remove the pressing block 42 of the pressing assembly 40, put the balance correction rod through the balance correction hole 12 and place it on the balance bracket for adjustment. balance correction;

(2) After the balance correction is completed, install the fixture to the drive shaft;

(3) At least part of the three-prong shaft part is sleeved outside the elastic expansion sleeve 22, and the fork shaft 51 is facing the positioning groove 3121; the external force acts on the three-prong shaft part until the three-prong shaft part and the positioning block 2111 of the first positioning seat 21 collide Matching; the second positioning seat 31 moves toward the direction close to the fork shaft 51 under the push of the elastic support assembly 32 until the fork shaft 51 is positioned and matched with the positioning groove 3121;

(4) After the circumferential positioning of the trident shaft parts is completed, the tightening nut 232 is rotated, and the pin rod 2311 drives the conical head 2312 to move toward the direction close to the positioning column 212, so that the elastic expansion sleeve 22 expands outward, and the elastic expansion sleeve 22 is tightly matched with the hole wall of the inner hole of the workpiece 50;

(5) Rotate the compression bolt 431, and push the compression block 42 to compress the trident shaft parts;

(6) After processing a fork shaft 51, rotate the tightening nut 232 in the opposite direction, and the pin rod 2311 drives the conical head 2312 to move away from the positioning column 212, so that the elastic expansion sleeve 22 shrinks inwardly and the elastic expansion The sleeve 22 is separated from the hole wall of the inner hole of the workpiece 50; the trident shaft part is rotated by 120°, and the steps (3) to (5) are repeated.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. The utility model provides a frock clamp which characterized in that includes:

the fixture base is used for being installed on the transmission shaft and provided with a supporting seat;

the positioning and tensioning mechanism is used for tensioning a workpiece and is arranged on the seat surface of the supporting seat; and

the circumferential positioning mechanism is arranged on one side of the positioning and tensioning mechanism and comprises a second positioning seat, the second positioning seat can be installed on the seat surface of the supporting seat in a floating mode, the second positioning seat is provided with a positioning groove used for being matched with the fork shaft of the workpiece in a positioning mode, and the width of the positioning groove is gradually increased along the direction far away from the seat surface of the supporting seat.

2. The tooling fixture of claim 1, wherein the circumferential positioning mechanism further comprises an elastic support assembly, the elastic support assembly is mounted on the supporting seat, and the elastic support assembly is connected with the second positioning seat and is used for driving the second positioning seat to float in a direction approaching to or away from the seat surface of the supporting seat.

3. The tooling clamp of claim 2, wherein the seat surface of the support base is provided with a through hole;

the elastic supporting assembly comprises a fixing sleeve and an ejecting piece, the fixing sleeve is fixed on one side, far away from the second positioning seat, of the supporting seat, an elastic piece is arranged in the fixing sleeve, the ejecting piece is partially arranged in the fixing sleeve, one end of the ejecting piece is connected with the elastic piece, and the other end of the ejecting piece penetrates through the through hole and is connected with the second positioning seat.

4. The tooling clamp of claim 3, wherein the elastic support assembly further comprises a guide sleeve adapted to the through hole, the guide sleeve is disposed in the through hole and sleeved outside the ejector, and the ejector can move relative to the guide sleeve along the axial direction of the guide sleeve.

5. The tooling clamp of claim 1, wherein the positioning and tensioning mechanism comprises a first positioning seat, the first positioning seat comprises a seat plate and a positioning column which is convexly arranged on the seat plate, and an elastic expansion sleeve is sleeved outside the positioning column;

the positioning and tensioning mechanism further comprises a tensioning assembly, and the tensioning assembly is used for driving the elastic expansion sleeve to expand and contract.

6. The tooling clamp of claim 5, wherein the positioning column is provided with a first through hole, and the supporting seat is correspondingly provided with a second through hole communicated with the first through hole;

the tensioning assembly comprises a tensioning taper pin, the tensioning taper pin comprises a pin rod and a conical head arranged at the end part of the pin rod, one end, far away from the conical head, of the pin rod penetrates through the first through hole and the second through hole and extends to one side, far away from the first positioning seat, of the supporting seat, and one end, far away from the conical head, of the pin rod is connected with a tensioning nut in a threaded mode.

7. The tooling clamp of claim 1, further comprising a pressing assembly, wherein the pressing assembly comprises a pressing block mounted on the clamp base, and the pressing block is arranged opposite to the positioning and tensioning mechanism and used for pressing a workpiece on the positioning and tensioning mechanism.

8. The tooling clamp of claim 7, wherein the hold-down assembly further comprises a pressure plate mounted on the clamp base, and the hold-down block is mounted on a side of the pressure plate facing the first positioning seat through a hold-down member;

the pressing plate is provided with a threaded hole; the pressing piece comprises an anti-return-loosening nut and a pressing bolt, and the pressing bolt penetrates through the threaded hole and is connected and matched with the threaded hole; the anti-loosening nut is in threaded connection with the compression bolt and is in abutting fit with one side, away from the compression block, of the pressure plate.

9. The tooling clamp of any one of claims 1 to 8, wherein a balance correction hole for a balance correction rod to pass through is formed in the middle of the clamp base;

the tool clamp further comprises a balance block, wherein the balance block is arranged on the seat surface of the clamp base, so that the tool clamp can keep balance when rotating.

10. A turning machine comprising a machine body and a tooling clamp according to any one of claims 1 to 9, the machine body including a drive shaft, the clamp mount being mounted to the drive shaft and being rotatable therewith.

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