CN221159392U

CN221159392U - Quick positioning fixture for cutting eccentric short step shaft

Info

Publication number: CN221159392U
Application number: CN202323173022.1U
Authority: CN
Inventors: 曹易辉; 李远哲; 龙毅; 林剑军; 周刚; 潘祥聪
Original assignee: Kunming Ruiyi Technology Co ltd
Current assignee: Kunming Ruiyi Technology Co ltd
Priority date: 2023-11-23
Filing date: 2023-11-23
Publication date: 2024-06-18
Anticipated expiration: 2033-11-23

Abstract

The utility model belongs to the technical field of machining clamps, and particularly discloses a rapid positioning clamp for cutting an eccentric short-step shaft. According to the utility model, one end of the clamp body is offset to the eccentric clamping sleeve, the connecting surface is provided with the transverse cutting groove, the eccentric clamping sleeve is provided with the opening and the connecting lug plate connected with the screw, the eccentric short step shaft can be rapidly and accurately positioned through the eccentric clamping sleeve, and the connecting lug plates at the two sides of the opening can be reliably clamped through the screw, so that the clamp has the characteristics of simple structure, rapid positioning, high precision and stable and reliable clamping.

Description

Quick positioning fixture for cutting eccentric short step shaft

Technical Field

The utility model belongs to the technical field of machining clamps, and particularly relates to a rapid positioning clamp for cutting an eccentric short step shaft, which has the advantages of simple structure, rapid positioning, high precision and stable and reliable clamping.

Background

The eccentric short step shaft and the eccentric short shaft sleeve are parts which are commonly encountered, and are generally processed by adopting a common horizontal lathe or an economic numerical control lathe. Because of the eccentricity between the shafts of the eccentric short step shaft and the outer diameter of the eccentric short shaft sleeve, the lathe processing mostly adopts a double eccentric center method, a three-jaw or four-jaw self-centering chuck and eccentric gasket method, an eccentric shaft sleeve method and the like for clamping processing.

The double eccentric center method clamping is that center holes are formed in two end faces of a part, so that the cutting workload is increased due to the fact that the center holes are machined in advance, the reserved quantity is increased for a step shaft with the end faces not allowing the center holes to be formed, the redundant reserved quantity is required to be cut off in the later period, the cutting workload is further increased, the material utilization rate is reduced, and the double eccentric center method clamping is not applicable to structures such as eccentric shaft sleeves and the like, wherein the paired center holes are difficult to be formed.

The three-jaw or four-jaw self-centering chuck and eccentric gasket method needs to add an eccentric gasket between one jaw of the chuck and the cylindrical surface of the part to be machined according to the eccentric degree of the part to be machined, and the eccentric gasket can meet the requirements after repeated correction and calibration.

The eccentric shaft sleeve method is to arrange the part to be processed in a special eccentric sleeve, ensure the positioning and stable clamping of the part to be processed on the eccentric sleeve through key grooves or interference fit, and then clamp the part to be processed on the eccentric sleeve by a machine tool to finish turning or grinding. However, the key slot connecting structure is not suitable for parts with smooth outer circles, and the interference fit mode is difficult to install and detach, and the surface of the part to be processed is easy to scratch.

In the prior art, in order to solve the clamping problem of the eccentric short step shaft and the eccentric short shaft sleeve, a clamping cavity is arranged at one end of a clamp body to accommodate an eccentric part, an adjusting channel communicated with the clamping cavity is arranged at the side part of the body, then an eccentric adjusting piece with corresponding thickness is selected according to the eccentric amount of the eccentric part to be processed to be inserted into one side of the eccentric part in the clamping cavity, and meanwhile, the eccentric amount is finely adjusted by a micro adjusting piece penetrating through the adjusting channel and extending into the clamping cavity, so that accurate positioning and reliable clamping are finally realized. The method has shorter adjustment time than a three-jaw or four-jaw self-centering chuck and eccentric gasket method, is suitable for clamping soft material parts, is convenient to assemble and disassemble than an eccentric shaft sleeve method, and is suitable for parts with smooth outer circles, but the adjustment process is still complicated and the assembly and disassembly efficiency is lower. The fixture is characterized in that an outer circle and a thread part connected with a tightening nut are arranged outside the fixture body, a central hole, a positioning hole and a mounting hole are arranged inside the fixture body, an eccentric distance exists between the positioning hole and the outer circle axis, the positioning hole is in small clearance fit with the outer circle surface of an eccentric short shaft to be machined, a butterfly spring piece group and a pressing ring are arranged in the mounting hole, when the fixture is used, axial pressure is generated through tightening the tightening nut, and then an inner hole of the fixture is contracted by the pressing ring to clamp and hold the outer circle of the eccentric short shaft to be machined. Although the clamping process of the clamping mechanism is simple and rapid, the structure is relatively complex, and the contact area between the butterfly-shaped spring piece group and the eccentric short shaft to be processed is small, so that indentation and even damage are easily generated on the contact surface, and the surface quality after processing is affected.

Disclosure of utility model

The utility model aims to provide the rapid positioning clamp for cutting the eccentric short step shaft, which has the advantages of simple structure, rapid positioning, high precision and stable and reliable clamping.

The utility model is realized by the following steps: including anchor clamps body, eccentric clamp cover, the anchor clamps body is the cylinder, eccentric clamp cover is elasticity ring and one end and anchor clamps body's terminal surface offset fixed connection and the connection face are last to have seted up horizontal cut groove, eccentric clamp cover has seted up the inside and outside opening of intercommunication in one side of horizontal cut groove, eccentric clamp cover is provided with symmetrical connection otic placode respectively in open-ended both sides outer end, screw and opposite side have been seted up perpendicularly on the connection otic placode of opening one side and the through-hole has been seted up to the opposite side, the connection otic placode of opening both sides is through passing the through-hole and meshing the screw interconnect in the screw.

Further, the transverse cutting groove is perpendicular to the central line of the clamp body, and the depth is greater than 1/3 of the diameter of the eccentric jacket.

Further, the center line of the opening on the cross section of the eccentric jacket extends through the center points of the clamp body and the eccentric jacket, and the transverse cutting grooves are bilaterally symmetrical with the center line of the opening on the cross section.

Further, the outer circular surface of the eccentric jacket is respectively provided with a longitudinal unloading groove at the end points of two sides of the transverse cutting groove, and the unloading grooves are C-shaped grooves or V-shaped grooves and longitudinally penetrate through two ends of the eccentric jacket.

Further, the spacing of the openings is 2-7 mm, and the width of the transverse cutting groove is 2-5 mm.

Further, a positioning groove is longitudinally formed in one side, far away from the opening, of the inner hole of the eccentric jacket, and the positioning groove is a C-shaped, V-shaped or rectangular groove which is adaptive to a positioning table on the outer circular surface of the eccentric short step shaft.

Further, the outer circular surface of one side of the eccentric jacket far away from the opening is inscribed with the outer circular surface of the clamp body, and the top end of the connecting lug plate far away from the eccentric jacket is not higher than the outer circular surface of the clamp body.

Further, a deviation rectifying screw hole is formed in the outer circular surface of the clamp body, and the deviation rectifying screw hole is connected with a deviation rectifying stud.

Further, one side of the clamp body, which is close to the eccentric jacket, is coaxially provided with a runout checking table, one or two deviation correcting screw holes are circumferentially arranged on the clamp body, the centers of the deviation correcting screw holes are coincident with the extension surface of the opening center surface, or a plurality of deviation correcting screw holes which are symmetrical with the opening center surface are circumferentially arranged on the clamp body.

The utility model has the beneficial effects that:

1. According to the utility model, the elastic eccentric jacket is arranged at one end of the clamp body in an offset manner, the transverse cutting groove is arranged between the connecting surfaces, self-centering clamping with the three-jaw or four-jaw clamping piece is realized through the clamp body, the opening which is communicated with the inside and the outside is arranged on the eccentric jacket, the connecting lug plates which can be connected by the screw are arranged at the two sides of the opening, so that the positioning of the part to be processed by the eccentric short step shaft or the eccentric short shaft sleeve can be realized rapidly and accurately through the characteristic that one side of the eccentric jacket is fixedly connected with the clamp body without deformation, and the eccentric jacket at the two sides of the opening can be deformed inwards to clamp the part to be processed through the connecting lug plates at the two sides of the screw, so that the rapid, accurate positioning and reliable clamping of the part to be processed are realized finally, and the whole structure is simple and the cost is low.

2. The eccentric clamping sleeve is used for positioning and reliably clamping the part to be machined, and the eccentric clamping sleeve is in annular surface contact with the part to be machined, so that unit clamping force acting on the part to be machined can be reduced to avoid clamping deformation, clamping marks and even clamping injuries, and the quality of the light, thin and soft part to be machined after machining is effectively ensured.

3. According to the utility model, the positioning is realized through the inner surface of the eccentric jacket far away from the opening side, and the clamping is realized through the opening of the elastic eccentric jacket, so that the clamping excircle of the part to be machined can be directly placed into the eccentric jacket to rotate the screw for clamping without alignment, the clamping process of the part to be machined is simpler and quicker, the machining efficiency can be obviously improved, and the elastic eccentric jacket can automatically loosen the machined part after the screw is loosened, so that the disassembly is easy and no scratch is left.

4. According to the utility model, the two side end points of the transverse cutting groove on the outer circular surface of the eccentric jacket are respectively provided with the longitudinal unloading groove, the screw adjusting force during clamping can be reduced through the unloading grooves so as to reduce the labor intensity, and the unloading grooves can also reduce the stress acting on the two side end points of the transverse cutting groove on the outer circular surface of the eccentric jacket during clamping, so that the rebound quantity of the eccentric jacket at one side of the opening can be maintained for a longer time, and the service life of the clamp is prolonged.

5. The utility model further provides a locating groove longitudinally arranged on one side of the inner hole of the eccentric jacket, which is far away from the opening, and the locating groove is matched with a locating table on the outer circular surface of the part to be processed for locating, so that the rotation of the part to be processed during cutting can be avoided, and the processing precision and the surface quality can be improved.

6. According to the utility model, the outer circular surface of the clamp body is further provided with the deviation correcting screw hole and is connected with the deviation correcting stud, and the whole eccentric quantity is balanced by adjusting the deviation correcting stud according to the vibration direction caused by the eccentricity when the clamp is installed and the part to be processed rotates at a high speed after clamping, so that vibration is inhibited or even eliminated, and vibration lines caused by vibration of the part to be processed are avoided, so that the surface quality after processing is improved.

In conclusion, the utility model has the characteristics of simple structure, quick positioning, high precision and stable and reliable clamping.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a second perspective view of the present utility model;

FIG. 5 is an axial view of FIG. 1;

In the figure: the fixture comprises a fixture body, a runout checking table 11, a plane 12, a 2-eccentric jacket 21, an opening 22, a connecting lug plate 23, an unloading groove 24, a positioning groove 3, a transverse cutting groove 4, a screw 4 and a correction stud 5.

Detailed Description

The utility model is further illustrated in the following figures and examples, which are not intended to be limiting in any way, and any alterations or modifications based on the teachings of the utility model are within the scope of the utility model.

As shown in fig. 1 to 5, the utility model comprises a clamp body 1 and an eccentric jacket 2, wherein the clamp body 1 is a cylinder, the eccentric jacket 2 is an elastic circular ring, one end of the eccentric jacket is in offset fixed connection with the end face of the clamp body 1, a transverse cutting groove 3 is formed in a connecting surface, an opening 21 for communicating the inside and the outside is formed in one side of the transverse cutting groove 3 of the eccentric jacket 2, symmetrical connecting lug plates 22 are respectively arranged at the outer ends of two sides of the opening 21 of the eccentric jacket 2, screw holes are vertically formed in the connecting lug plates 22 at one side of the opening 21, through holes are formed in the other side of the connecting lug plates 22 at two sides of the opening 21, and the connecting lug plates 22 penetrating through the through holes and meshed with screws 4 in the screw holes are connected with each other.

The transverse cutting groove 3 is perpendicular to the central line of the clamp body 1 and has a depth greater than 1/3 of the diameter of the eccentric jacket 2.

The center line of the opening 21 on the cross section of the eccentric jacket 2 extends through the center points of the clamp body 1 and the eccentric jacket 2, and the transverse cutting groove 3 is bilaterally symmetrical with the center line of the opening 21 on the cross section.

The outer circular surface of the eccentric jacket 2 is respectively provided with a longitudinal unloading groove 23 at the end points of two sides of the transverse cutting groove 3, and the unloading grooves 23 are C-shaped grooves or V-shaped grooves and longitudinally penetrate through two ends of the eccentric jacket 2.

The spacing of the openings 21 is 2-7 mm, and the width of the transverse cutting groove 3 is 2-5 mm.

The inner hole of the eccentric jacket 2 is longitudinally provided with a positioning groove 24 at one side far away from the opening 21, and the positioning groove 24 is a C-shaped, V-shaped or rectangular groove which is suitable for a positioning table on the outer circular surface of the eccentric short step shaft.

The outer circular surface of the side, far away from the opening 21, of the eccentric jacket 2 is inscribed with the outer circular surface of the clamp body 1, and the top end, far away from the eccentric jacket 2, of the connecting lug plate 22 is not higher than the outer circular surface of the clamp body 1.

The outer circular surface of the clamp body 1 is provided with a correction screw hole, and the correction screw hole is connected with a correction stud 5.

The fixture is characterized in that a runout checking table 11 is coaxially arranged on one side, close to the eccentric jacket 2, of the fixture body 1, one or two deviation correcting screw holes are circumferentially arranged on the fixture body 1, the centers of the deviation correcting screw holes coincide with the extension surface of the center surface of the opening 21, or a plurality of deviation correcting screw holes which are symmetrically arranged on the center surface of the opening 21 are circumferentially arranged on the fixture body 1.

The clamp body 1 is symmetrically provided with planes 12 parallel to the opening 21 on both sides of the opening 21.

The working principle and the working process of the utility model are as follows:

As shown in fig. 1 to 5, before machining, the outer circle of the side of the clamp body 1 away from the eccentric jacket 2 is clamped on a three-jaw chuck of a machine tool, and a dial gauge is used for calibrating a runout amount checking table 11 to control the circle runout to be within a preset range (the correction can be assisted by adjusting the correction stud 5 if necessary), so that the installation correction of the clamp body 1 is completed. During machining, the connecting surface of the eccentric short step shaft is inserted into the eccentric jacket 2, the eccentric short step shaft is tightly attached to the inner wall of one side far away from the opening 21, then the screw 4 is screwed down to enable the opening 21 to move inwards to drive the eccentric jackets 2 on two sides to elastically deform inwards so as to clamp the eccentric short step shaft, positioning and clamping of the eccentric short step shaft are completed, and at the moment, the eccentric short step shaft can be machined. After the machining is finished, the screw 4 is loosened, the elastic eccentric jacket 2 is opened in a loose state, the machined eccentric short step shaft can be taken out, and then a new eccentric short step shaft to be machined is replaced according to the process.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present utility model should be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. The utility model provides a quick positioning fixture of short step axle of cutting eccentric, its characterized in that includes anchor clamps body (1), eccentric clamp cover (2), anchor clamps body (1) are the cylinder, eccentric clamp cover (2) are elasticity ring and one end and end offset fixed connection of anchor clamps body (1) and connection face are last to have seted up horizontal cut groove (3), opening (21) inside and outside intercommunication are seted up to one side of horizontal cut groove (3) of eccentric clamp cover (2), eccentric clamp cover (2) are provided with symmetrical engaging lug board (22) respectively in the both sides outer end of opening (21), screw and opposite side have been seted up on the engaging lug board (22) of opening (21) one side perpendicularly, engaging lug board (22) of opening (21) both sides are through passing the through-hole and meshing screw (4) interconnect in the screw.

2. The rapid positioning fixture for cutting eccentric short step shafts according to claim 1, characterized in that the transverse cutting groove (3) is perpendicular to the center line of the fixture body (1) and has a depth greater than 1/3 of the diameter of the eccentric jacket (2).

3. The rapid positioning fixture for cutting eccentric short step shafts according to claim 2, characterized in that the center line of the opening (21) on the cross section of the eccentric jacket (2) extends through the center points of the fixture body (1) and the eccentric jacket (2), and the transverse cutting groove (3) is bilaterally symmetrical with the center line of the opening (21) on the cross section.

4. The rapid positioning clamp for cutting the eccentric short-step shaft according to claim 3, wherein the outer circular surface of the eccentric jacket (2) is respectively provided with a longitudinal unloading groove (23) at the end points of two sides of the transverse cutting groove (3), and the unloading groove (23) is a C-shaped groove or a V-shaped groove and longitudinally penetrates through two ends of the eccentric jacket (2).

5. A quick positioning jig for cutting eccentric short step shafts according to claim 3, characterized in that the spacing of the openings (21) is 2-7 mm, and the width of the transverse cut groove (3) is 2-5 mm.

6. A rapid positioning fixture for cutting an eccentric short step shaft according to claim 3, characterized in that a positioning groove (24) is longitudinally arranged on one side of the inner hole of the eccentric jacket (2) far away from the opening (21), and the positioning groove (24) is a C-shaped, V-shaped or rectangular groove which is suitable for a positioning table on the outer circular surface of the eccentric short step shaft.

7. The rapid positioning fixture for cutting eccentric short step shafts according to any one of claims 1 to 6, characterized in that the outer circular surface of the side of the eccentric jacket (2) far from the opening (21) is inscribed with the outer circular surface of the fixture body (1), and the top end of the connecting lug plate (22) far from the eccentric jacket (2) is not higher than the outer circular surface of the fixture body (1).

8. The rapid positioning clamp for the eccentric short step shaft cutting according to claim 7 is characterized in that a deviation correcting screw hole is formed in the outer circular surface of the clamp body (1), and the deviation correcting screw hole is connected with a deviation correcting stud (5).

9. The rapid positioning clamp for cutting the eccentric short-step shaft according to claim 8, characterized in that a runout checking table (11) is coaxially arranged on one side, close to the eccentric jacket (2), of the clamp body (1), one or two deviation correcting screw holes are circumferentially arranged on the clamp body (1), the centers of the deviation correcting screw holes coincide with the extension surface of the central surface of the opening (21), or a plurality of deviation correcting screw holes which are symmetrical with the central surface of the opening (21) are circumferentially arranged on the clamp body (1).