阅读说明：本技术 一种薄壁长筒零件加工用套筒式中心架 (Sleeve type center frame for thin-wall long-cylinder part machining ) 是由 房超 刘鹏飞 蔡红霞 于 2020-12-31 设计创作，主要内容包括：本发明为一种薄壁长筒零件加工用套筒式中心架,包括中心架本体,所述中心架本体内侧面连接有轴承,所述中心架本体左端连接有用于压紧轴承的法兰盖；所述轴承内孔中连接有锥套,所述锥套左端内侧设有内锥面；所述锥套内滑动连接有夹套,所述夹套左端设有与锥套的内锥面贴合的外锥面,所述夹套左端沿着圆周方向开设有若干条缩缝；所述中心架本体内连接有能够带动夹套向右运动使得缩缝变小进而夹紧穿设于夹套内的工件的活塞组件。本中心架能够对薄壁长筒工件产生一个环抱的夹持力,使其工件受力均匀,不易产生变形,从而提高加工精度,而且操作方便,省时省力。(The invention relates to a sleeve type center frame for processing a thin-wall long-tube part, which comprises a center frame body, wherein the inner side surface of the center frame body is connected with a bearing, and the left end of the center frame body is connected with a flange cover for pressing the bearing; a taper sleeve is connected in the inner hole of the bearing, and an inner conical surface is arranged on the inner side of the left end of the taper sleeve; a jacket is connected in the taper sleeve in a sliding manner, an outer conical surface attached to the inner conical surface of the taper sleeve is arranged at the left end of the jacket, and a plurality of shrinkage cracks are formed at the left end of the jacket along the circumferential direction; the piston assembly capable of driving the jacket to move rightwards to enable the contraction joint to be small and further clamp the workpiece penetrating through the jacket is connected into the center frame body. The center frame can generate an encircling clamping force on a thin-wall long-cylinder workpiece, so that the workpiece is uniformly stressed and is not easy to deform, the machining precision is improved, and the center frame is convenient to operate, time-saving and labor-saving.)

1. The utility model provides a long section of thick bamboo telescopic centre frame for parts machining of thin wall, includes hollow centre frame body (9), centre frame body (9) medial surface is connected with bearing, its characterized in that: a taper sleeve (5) is connected in the inner hole of the bearing, and an inner conical surface (51) is arranged on the inner side of the left end of the taper sleeve (5); a jacket (8) for clamping a workpiece is connected in the taper sleeve (5) in a sliding manner, an outer conical surface (82) attached to an inner conical surface (51) of the taper sleeve (5) is arranged at the left end of the jacket (8), and a plurality of shrinkage cracks (81) are formed at the left end of the jacket (8) along the circumferential direction; the piston assembly (101) capable of driving the clamping sleeve (8) to move rightwards to enable the contraction joint (81) to become small and further clamp a workpiece penetrating through the clamping sleeve (8) is connected into the center frame body (9).

2. The telescopic center frame for machining the thin-wall long-tube part as claimed in claim 1, wherein: piston assembly (101) is including the fixed cover (15) of cover (8) right side surface is located to the cover, fixed cover (15) outside rotatable coupling has bearing housing (11), fixed cover (15) right side is equipped with the piece of blockking of connection at cover (8) right-hand member, piston assembly (101) still includes the hydraulic drive subassembly that can promote bearing housing (11) side-to-side movement.

3. The telescopic center frame for machining the thin-wall long-tube part as claimed in claim 1, wherein: the right end of the central frame body (9) is connected with a right end cover (17), and the outer circumferential surface of the bearing sleeve (11) is in sliding connection with the inner side surface of the central frame body (9) and the inner side surface of the right end cover (17); a sliding groove (18) in the left-right direction is formed between the vertical surface of the inner side of the center frame body (9) and the left end surface of the right end cover (17), a sliding boss (111) is connected to the outer side surface of the bearing sleeve (11), and the top of the sliding boss (111) is in sliding connection with the bottom of the sliding groove (18); the hydraulic drive assembly comprises a hydraulic pump and an oil pipe connected with the hydraulic pump, the left side and the right side of the sliding boss (111) are respectively provided with a first oil inlet hole (P) and a second oil inlet hole (Q) which are arranged on the sliding groove (18), and the oil pipe is respectively connected with the first oil inlet hole (P) and the second oil inlet hole (Q).

4. The telescopic center frame for machining the thin-walled long-tube part as claimed in claim 1 or 3, wherein: the bearing comprises a deep groove ball bearing (4) and a one-way thrust bearing I (7) which are connected between a taper sleeve (5) and a center frame body (9).

5. The telescopic center frame for machining the thin-wall long-tube part as claimed in claim 4, wherein: and a dustproof ring (3) is connected between the taper sleeve (5) and the central frame body (9).

6. The telescopic center frame for machining the thin-wall long-tube part as claimed in claim 5, wherein: o-shaped rings (13) are connected between the bearing sleeve (11) and the center frame body (9) and the right end cover (17) and between the sliding boss (111) and the sliding groove (18).

Technical Field

The invention relates to the technical field of center frames of numerically controlled lathes, in particular to a sleeve type center frame for machining thin-wall long-cylinder parts.

Background

In the process of machining heavy precision parts in various fields, including various thin-wall long cylinder parts such as small spacecrafts, ships, military industry, automobiles and the like, the machining precision requirement cannot be met only by using chuck clamping and tailstock supporting, and a central frame is often used for clamping and supporting the middle part, so that the central frame is required to be additionally arranged on a numerical control machine tool for machining the thin-wall long cylinder parts. The traditional center frame structure is generally of a roller type, and a plurality of points on the circumference of a long-tube part are clamped and supported, so that the local deformation of a thin-wall part is caused, the precision of a workpiece is influenced, the use requirement of the workpiece cannot be met, the rejection rate is increased, and the processing cost is further increased.

An ordinary heavy numerical control horizontal lathe is generally provided with a manual center frame or a hydraulic center frame, and the manual center frame is troublesome to operate; the hydraulic center frame also needs to repeatedly adjust the hydraulic pressure to clamp the workpiece, which wastes time and labor.

Disclosure of Invention

In order to overcome the problems in the prior art, the invention provides the sleeve-type center frame for machining the thin-wall long-cylinder part, which can generate an encircling clamping force on the thin-wall long-cylinder workpiece, so that the workpiece is uniformly stressed and is not easy to deform, the machining precision is improved, the operation is convenient, and the time and the labor are saved.

The invention is realized by the following technical scheme:

a sleeve type center frame for machining a thin-wall long-tube part comprises a center frame body, wherein a bearing is connected to the inner side surface of the center frame body, and a flange cover used for pressing the bearing is connected to the left end of the center frame body; a taper sleeve is connected in the inner hole of the bearing, and an inner conical surface is arranged on the inner side of the left end of the taper sleeve; a jacket is connected in the taper sleeve in a sliding manner, an outer conical surface attached to the inner conical surface of the taper sleeve is arranged at the left end of the jacket, and a plurality of shrinkage cracks are formed at the left end of the jacket along the circumferential direction; the piston assembly capable of driving the jacket to move rightwards to enable the contraction joint to be small and further clamp the workpiece penetrating through the jacket is connected into the center frame body.

Preferably, the piston assembly comprises a fixed sleeve sleeved on the outer surface of the right side of the jacket, a bearing sleeve is rotatably connected to the outer side of the fixed sleeve, a blocking piece connected to the right end of the jacket is arranged on the right side of the fixed sleeve, and the piston assembly further comprises a hydraulic driving assembly capable of pushing the bearing sleeve to move left and right.

Preferably, the right end of the central frame body is connected with a right end cover, and the outer circumferential surface of the bearing sleeve is in sliding connection with the inner side surface of the central frame body and the inner side surface of the right end cover; a sliding groove in the left-right direction is formed between the vertical surface of the inner side of the center frame body and the left end surface of the right end cover, a sliding boss is connected to the outer side surface of the bearing sleeve, and the top of the sliding boss is connected with the bottom of the sliding groove in a sliding manner; the hydraulic driving assembly comprises a hydraulic pump and an oil pipe connected with the hydraulic pump, the left side and the right side of the sliding boss are respectively provided with a first oil inlet hole and a second oil inlet hole which are arranged on the sliding groove, and the oil pipe is respectively connected with the first oil inlet hole and the second oil inlet hole.

Preferably, the bearing comprises a first deep groove ball bearing and a first one-way thrust bearing which are connected between the taper sleeve and the center frame body.

Preferably, a dustproof ring is connected between the taper sleeve and the center frame body.

Preferably, O-shaped rings are connected between the bearing sleeve and the center frame body and between the bearing sleeve and the right end cover as well as between the sliding lug boss and the sliding groove.

The invention has the beneficial effects that:

1. the taper sleeve is rotatably connected in the center frame body, the clamping sleeve is connected in the taper sleeve in a sliding mode, the taper sleeve is attached to the conical surface of the left end of the clamping sleeve, a plurality of contraction joints are formed in the left end of the clamping sleeve along the circumferential direction, and the piston assembly capable of driving the clamping sleeve to move left and right is connected in the center frame body. When a machine tool starts to process a thin-wall long-cylinder part, a workpiece penetrates into an inner hole of the jacket, the piston assembly drives the jacket to move rightwards, because the outer conical surface of the jacket is attached to the inner conical surface of the taper sleeve, the rightward movement of the jacket relative to the taper sleeve enables a contraction joint on the jacket to be extruded and reduced, and the workpiece in the inner hole is embraced after the inner diameter of the jacket is reduced, so that the workpiece is clamped, and the machine tool starts to cut; after the workpiece is machined, the piston assembly drives the clamping sleeve to move leftwards, and the shrinkage joint of the clamping sleeve is deformed and recovered under the elasticity of the clamping sleeve, so that the workpiece is loosened, and the workpiece machining is completed. Compared with the roller type center frame in the prior art, the clamping device can generate an encircling clamping force on a thin-wall long-cylinder workpiece, so that the workpiece is uniformly stressed and is not easy to deform, the machining precision is improved, and the clamping device is convenient to operate, time-saving and labor-saving.

2. The piston assembly is driven by hydraulic oil as a medium through the hydraulic driving assembly, and the driving structure is simple, the cost is low and the driving force is large.

3. The bearing is including connecting deep groove ball bearing and the one-way thrust bearing one between taper sleeve and centre frame body, and the combination of deep groove ball bearing and one-way thrust bearing one can enough bear great radial force and can bear great axial force simultaneously when providing to rotate to connect, and structural reliability is better.

4. Be connected with the dust ring between taper sleeve and the centre frame body for the structure has better dustproof sealing nature, improves life.

5. All be connected with O type circle between bearing housing and centre frame body and the right-hand member lid, between slip boss and the sliding tray, O type circle can effectively avoid the hydraulic oil of slip boss both sides to pass through the slip contact surface and cluster each other, avoids hydraulic oil to leak out from the sliding tray simultaneously.

Drawings

The invention will be further described with reference to the accompanying drawings.

Fig. 1 is an overall sectional structural view of the present invention.

FIG. 2 is a schematic view of a jacket structure in the present invention.

In the figure, 1-left end cover, 2-flange cover, 3-dust ring, 4-deep groove ball bearing, 5-taper sleeve, 51-inner conical surface, 6-spacer sleeve, 7-one-way thrust bearing I, 8-jacket, 81-contraction joint, 82-outer conical surface, 9-center frame body, 101-piston component, 10-retainer ring, 11-bearing sleeve, 111-sliding boss, 12-one-way thrust bearing II, 13-O-shaped ring, 14-bearing gland, 15-fixing sleeve, 151-step boss, 16-locking nut, 17-right end cover, 18-sliding groove, P-oil inlet hole I and Q-oil inlet hole II.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention will be further described with reference to the accompanying drawings.

The invention relates to a sleeve type center frame for processing thin-wall long-cylinder parts, which comprises a center frame body 9 with a hollow inner part as shown in a figure 1-2, wherein the structure of the center frame body 9 is as shown in a figure 1, and the inner side surface of the center frame body 9 is used as a rotary support of an inner rotating part through a bearing.

The left end of the central frame body 9 is connected with a flange cover 2 through a screw fixedly, and the inner side of the flange cover 2 abuts against the outer ring of the bearing. The left end cover 1 fixed by screws on the flange cover 2 and the right end cover 17 fixed by screws on the right end of the central frame body 9 enable a closed cavity to be formed in the central frame body 9. A taper sleeve 5 is connected in the inner hole of the bearing in a tight fit manner, a shaft shoulder on the outer circumferential surface of the left end of the taper sleeve 5 props against the inner ring of the bearing, and an inner conical surface 51 which is wide at the left end and narrow at the right end is arranged on the inner side surface of the left end of the taper sleeve 5. The taper sleeve 5 is internally and slidably connected with a clamping sleeve 8, the left end of the clamping sleeve 8 is provided with an outer conical surface 82 attached to the inner conical surface 51 of the taper sleeve 5, the left end of the clamping sleeve 8 is provided with a plurality of shrinkage joints 81 along the circumferential direction, the structure of the clamping sleeve 8 is shown in fig. 2, the clamping sleeve 8 is used for clamping a workpiece, the size can be customized according to the size of the workpiece, the clamping sleeve 8 is easy to disassemble and can be pulled out and replaced from the left side, and therefore the clamping device is suitable for clamping thin-wall long-tube parts.

The piston assembly 10 which can drive the jacket 8 to move rightwards so that the contraction joint 81 becomes smaller and then clamps the workpiece penetrating through the jacket 8 is connected in the center frame body 9. When a machine tool starts to process thin-wall long cylinder parts, a thin-wall long cylinder workpiece penetrates into an inner hole of the jacket 8, the piston assembly drives the jacket 8 to move rightwards, the shrinkage joint 81 on the jacket 8 is extruded to be reduced due to the fact that the outer conical surface 82 of the jacket 8 is attached to the inner conical surface 51 of the taper sleeve 5, the deformed jacket 8 moves rightwards relative to the taper sleeve 5, the inner diameter of the deformed jacket 8 is reduced, the workpiece in the inner hole is embraced, and therefore clamping of the workpiece is achieved, and the machine tool starts to cut; after the workpiece is machined, the piston assembly drives the clamping sleeve 8 to move leftwards, the contraction joint 82 of the clamping sleeve 8 is widened under the elasticity of the clamping sleeve 8, and the left end of the clamping sleeve 8 is deformed and restored, so that the workpiece is loosened, and the workpiece machining is completed. Compared with the roller type center frame in the prior art, the clamping device can generate an encircling clamping force on a thin-wall long-cylinder workpiece, so that the workpiece is uniformly stressed and is not easy to deform, the machining precision is improved, and the clamping device is convenient to operate, time-saving and labor-saving.

Piston assembly 101 is including the fixed cover 15 that the cover was located and presss from both sides the cover 8 right side surface, and fixed cover 15 left end is fixed through ladder boss 151, and the right-hand member is fixed through connecting the piece of blockking at pressing from both sides the cover 8 right-hand member, and it is lock nut 16 to block the piece, and lock nut 16 threaded connection is on pressing from both sides the cover 8 right-hand member external screw thread. The outer side of the fixed sleeve 15 is rotatably connected with a bearing sleeve 11, specifically, the outer side of the bearing sleeve 11 is tightly matched with a second one-way thrust bearing 12, the left end of the inner ring of the second one-way thrust bearing 12 is fixed through a check ring 10, and the right end of the inner ring is fixed through a shaft shoulder on the fixed sleeve 15. The bearing sleeve 11 is sleeved outside the outer ring of the one-way thrust bearing II 12, the right end of the bearing sleeve 11 is connected with the bearing gland 14 through a screw, the bearing gland 14 fixes the right side of the outer ring of the one-way thrust bearing II 12, and the left side of the outer ring of the one-way thrust bearing II 12 is fixed through a shaft shoulder on the left side of the bearing sleeve 11. The outer circumferential surface of the bearing sleeve 11 is slidably connected to the inner surface of the center frame body 9 and the inner surface of the right end cover 17, as shown in fig. 1.

The piston assembly 101 also includes a hydraulic drive assembly capable of driving the bearing housing 11 to move left and right.

A sliding groove 18 in the left-right direction is formed between the inner vertical surface of the center frame body 9 and the left end surface of the right end cover 17, as shown in fig. 1, a sliding boss 111 is formed on the outer side surface of the bearing sleeve 11, the sliding boss 111 can slide in the sliding groove 18 in the left-right direction, and the top of the sliding boss 111 is slidably connected with the bottom of the sliding groove 18. The hydraulic driving assembly comprises a hydraulic pump and an oil pipe connected with the hydraulic pump, the left side and the right side of the sliding boss 111 are respectively provided with a first oil inlet hole P and a second oil inlet hole Q which are arranged on the sliding groove 18, and the oil pipe is respectively connected with the first oil inlet hole P and the second oil inlet hole Q. When oil enters the oil inlet hole P, the oil pressure on the left side of the sliding boss 111 pushes the sliding boss 111 and the whole piston assembly 101 to move rightwards, and the piston assembly 101 moves rightwards to drive the jacket 8 to move rightwards so as to clamp a workpiece; when oil enters the oil inlet hole II Q, the oil pressure on the right side of the sliding boss 111 pushes the sliding boss 111 and the whole piston assembly 101 to move leftwards, and the piston assembly 101 moves leftwards to drive the jacket 8 to move leftwards so as to loosen a workpiece.

The bearing on the inner side of the central frame body 9 comprises a deep groove ball bearing 4 and a one-way thrust bearing I7 which are connected between a taper sleeve 5 and the central frame body 9, in the embodiment, two deep groove ball bearings 4 are arranged on the left side in the central frame body 9, the one-way thrust bearing I7 is arranged on the right side of each deep groove ball bearing 4, and the deep groove ball bearings 4 and the one-way thrust bearing I7 are separated through a separating sleeve 6. The combination of the deep groove ball bearing 4 and the one-way thrust bearing I7 can bear larger radial force and larger axial force while providing rotary connection, and the structural reliability is better.

Be connected with dust ring 3 between taper sleeve 5 and the centre frame body 9, as shown in fig. 1, dust ring 3 respectively is equipped with one on deep groove ball bearing 4 left side and one-way thrust bearing 7 right side for the structure has better dustproof leakproofness, and the protection bearing improves life.

The O-rings 13 are connected between the bearing sleeve 11 and the center frame body 9 and the right end cover 17, and between the sliding boss 111 and the sliding groove 18, as shown in fig. 1, the O-rings 13 can effectively prevent hydraulic oil on two sides of the sliding boss 111 from being connected with each other through a sliding contact surface, and thus pressure difference cannot be formed and the piston assembly 101 cannot be pushed to move left and right; at the same time, the O-ring 13 prevents hydraulic oil from leaking out of the slide groove 18.

The working process is as follows: when a machine tool starts to process thin-wall long cylinder parts, a thin-wall long cylinder workpiece penetrates into an inner hole of a jacket 8, at the moment, a fuel inlet hole P is filled with fuel, as shown in fig. 1, the oil pressure on the left side of a sliding boss 111 pushes the sliding boss 111 and the whole piston assembly 101 to move rightwards, the piston assembly 101 simultaneously drives the jacket 8 to move rightwards synchronously, as the outer conical surface 82 of the jacket 8 is attached to the inner conical surface 51 of the taper sleeve 5, the rightward movement of the jacket 8 relative to the taper sleeve 5 enables a contraction joint 81 on the jacket 8 to be extruded and reduced, the inner diameter of the deformed jacket 8 is reduced and embraces the workpiece in the inner hole, so that the workpiece is clamped, and the machine; after the workpiece is machined, oil enters the oil inlet hole II Q, the oil pressure on the right side of the sliding boss 111 pushes the sliding boss 111 and the whole piston assembly 101 to move leftwards, the piston assembly 101 simultaneously drives the jacket 8 to move leftwards, the width of the contraction joint 82 of the jacket 8 is reduced under the elasticity of the jacket 8, the deformation of the left end of the jacket 8 is recovered, and therefore the workpiece is loosened, and the workpiece machining is completed.

In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.

The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the invention and are considered to be within the scope of the invention.