CN214769048U

CN214769048U - Internal expansion type clamp for thin-wall aluminum alloy part

Info

Publication number: CN214769048U
Application number: CN202120696515.5U
Authority: CN
Inventors: 徐海昆; 兰超; 杨懿; 舒飞
Original assignee: Kunming Honggu Machinery Manufacturing Co ltd
Current assignee: Kunming Honggu Machinery Manufacturing Co ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-11-19
Anticipated expiration: 2031-04-07

Abstract

The utility model discloses an internal expanding formula anchor clamps for thin wall aluminum alloy part, including the positioning disk, first supporting disk, the second supporting disk, the dabber, the conical disk, the separation sleeve, positioning disk one end is equipped with connecting portion and the other end and the coaxial fixed of dabber, first supporting disk and dabber or positioning disk coaxial coupling, the dabber other end is equipped with the screw thread section, the conical disk is established at the spindle for outer conical disk and slip cap, circle conical disk and butt are on the outer conical surface of conical disk in the second supporting disk is elasticity, the separation sleeve cover is established at the spindle between first and second supporting disk terminal surface, the screw thread section is equipped with the fastening nut that can support tight conical disk terminal surface. The utility model discloses a fastening nut can promote the conical disk and slide along the dabber and make the second supporting disk press from both sides tightly or loosen the work piece, the part of not only adaptable different internal diameters, and the whole big influence that can increase area of contact in order to reduce the clamping-force to work piece deformation that rises of second supporting disk has simple structure, the clamping-force is even, the reliable and non-deformable of centre gripping, strong adaptability's characteristics.

Description

Internal expansion type clamp for thin-wall aluminum alloy part

Technical Field

The utility model belongs to the technical field of mechanical fixture, concretely relates to an internal expanding type anchor clamps for thin wall aluminum alloy part of simple structure, clamping-force are even, the centre gripping is reliable and non-deformable, strong adaptability.

Background

With the technical progress and the accelerated pace of life, in order to adapt to the rapid iteration demand and competition of the market, modern production requires that product varieties manufactured by enterprises are frequently updated. Research shows that the varieties of workpieces produced in middle and small batches of multiple varieties account for about 85 percent of the total varieties of workpieces at present. Therefore, how to improve the quality and efficiency of the production of medium and small batches of various workpieces becomes the key of the competitive power of enterprises.

The clamp is an important component of the process equipment, and the quality, the production efficiency and the production cost of mechanical products are influenced to a great extent. In other words, "the worker wants to do his best, and must first make good use of his/her device", and a suitable clamp is an important part for ensuring the production process equipment for medium and small batches of various workpieces. However, the existing enterprises are still used to adopt a large number of special fixtures designed for mass production, such as widely-used pneumatic spring internal expansion type chucks, although the clamping efficiency is high, a pull rod and an air cylinder need to be additionally arranged in a machine tool spindle, the structure is complex, the production preparation period is long, and a special customized machine tool is required or a common machine tool needs to be modified in many cases, so that the cost of the fixtures and the machine tool is high, the replacement of the fixtures is inconvenient, and the fixture cannot be well adapted to the production of various workpieces in small and medium batches at present. In addition, when the existing pneumatic spring internal expanding type chuck is expanded, the front end and the rear end of the existing pneumatic spring internal expanding type chuck have certain inclination, and certain error is formed between the upper end and the lower end of the inner diameter of a thin-wall and low-rigidity workpiece after the workpiece is expanded, so that the concentricity is poor.

The thin-wall aluminum alloy part has the characteristics of thin wall and softness, so that the rigidity and the strength are poor, the thin-wall aluminum alloy part is very sensitive to various processing factors, and the thin-wall aluminum alloy part is very easy to deform under the influence of cutting force, clamping force, cutting heat and residual stress in processing. Therefore, it is important to design a proper clamp according to the machining process.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an internal expanding type anchor clamps for thin wall aluminum alloy part that simple structure, dismouting are convenient, reliable and stable, the flexibility is good.

The purpose of the utility model is realized like this: including positioning disk, first supporting disk, second supporting disk, dabber, conical disk, separation sleeve, positioning disk one end is provided with the connecting portion of being connected with the machine tool jack catch, dabber one end and the coaxial fixed connection of positioning disk of keeping away from connecting portion, first supporting disk and dabber or the positioning disk coaxial coupling of keeping away from connecting portion, the one end that the positioning disk was kept away from to the dabber is provided with the screw thread section, the conical disk is provided with through-hole and slip cap perpendicularly for outer conical disk and center and establishes at the dabber of nearly screw thread section, the second supporting disk is interior conical disk and butt on the outer conical surface of conical disk, the separation sleeve cover is established at the spindle between first supporting disk and second supporting disk terminal surface, the cooperation is provided with the fastening nut that can support tight conical disk terminal surface in the screw thread section.

The utility model has the advantages that:

1. the utility model pushes the conical disc to slide along the mandrel through the fastening nut on the mandrel so as to lead the second supporting disc to clamp or loosen the workpiece, thereby not only being suitable for parts with a certain inner diameter size range, but also being capable of expanding the application range of the clamp; and realize pressing from both sides tightly or loosen through adjusting fastening nut, compare and need increase the traditional structure of cylinder or manual pull rod, overall structure is comparatively simple and production preparation cycle is shorter, also need not special machine tool and repacking lathe, more can adapt to the production of medium and small batch multiple variety work piece.

2. The utility model adopts the second support disk made of elastic plastic, which can realize clamping through integral expansion, and compared with the multi-petal structure of the traditional spring chuck, the contact area between the clamp and the inner circle of the workpiece can be obviously increased, so that the clamping force is more uniform, thereby effectively reducing or even avoiding the influence of the clamping force on the deformation of the workpiece; in addition, the second supporting disk made of the elastic plastic material has certain self-lubricating shape and hardness lower than that of aluminum alloy, so that the workpiece and the clamp can be conveniently assembled and disassembled, and aluminum alloy parts can be prevented from being scratched in clamping.

3. The utility model has the advantages that the second supporting disk is added, and the second supporting disk and the first supporting disk jointly support the inner circle of the workpiece at two ends during clamping, so that the clamping is more reliable, the rigidity of the workpiece during processing can be effectively increased, and the adverse effects of cutting force, cutting heat and residual stress on the workpiece are reduced or even avoided; and also can reduce the poor problem of concentricity to forming the error between the work piece inner circle both ends because front and back end inclination when the second supporting disk expands.

The utility model discloses process through continuous experiment, adjustment until the process of stereotyping, reached current actual batch production application effect, wholly have simple structure, clamping-force even, the reliable and non-deformable of centre gripping, strong adaptability's characteristics.

Drawings

FIG. 1 is one of the structural diagrams of the present invention (groove I + no pressing block);

FIG. 2 is a second structural diagram (groove I + pressing block) of the present invention;

fig. 3 is a third schematic view of the structure of the present invention (fig. 3+ frustum + groove ii + press block);

fig. 4 is a fourth structural diagram of the present invention (fig. 4+ the third supporting plate);

FIG. 5 is a right side view of FIG. 4 (without the pre-machined workpiece);

in the figure: 1-positioning disc, 1-1-connecting part, 1-2-frustum, 2-first supporting disc, 2-1-groove II, 3-second supporting disc, 3-1-groove I, 4-mandrel, 4-1-thread section, 5-conical disc, 6-spacer sleeve, 7-fastening nut, 8-pressing block, 9-screw, 10-third supporting disc, 10-1-groove III, 11-conical sleeve and 12-preprocessed workpiece.

Detailed Description

The present invention is further described with reference to the following drawings and examples, but the present invention is not limited thereto in any way, and any modification or improvement based on the teaching of the present invention is within the protection scope of the present invention.

As shown in fig. 1 to 5, the utility model comprises a positioning disk 1, a first supporting disk 2, a second supporting disk 3, a mandrel 4, a conical disk 5 and an isolation sleeve 6, wherein one end of the positioning disk 1 is provided with a connecting part 1-1 connected with a claw of a processing machine tool, one end of the mandrel 4 is coaxially and fixedly connected with the positioning disk 1 far away from the connecting part 1-1, the first supporting disk 2 is coaxially connected with the mandrel 4 or the positioning disk 1 far away from the connecting part 1-1, one end of the mandrel 4 far away from the positioning disk 1 is provided with a thread section 4-1, the conical disk 5 is an outer conical disk, the center of the conical disk is vertically provided with a through hole and is sleeved on the mandrel 4 close to the thread section 4-1 in a sliding manner, the second supporting disk 3 is an inner conical disk of elastic plastic and is abutted against an outer conical surface of the conical disk 5, the isolation sleeve 6 is sleeved on the mandrel 4 between the end surfaces of the first supporting disk 2 and the second supporting disk 3, and a fastening nut 7 capable of tightly abutting against the end face of the conical disc 5 is arranged on the threaded section 4-1 in a matching manner.

The periphery of the second supporting disk 3 is a straight cylinder or a conical column, and a plurality of grooves I3-1 extending towards the mandrel 4 are circumferentially arranged on one side of the periphery of the second supporting disk 3 close to the threaded section 4-1 at intervals.

As shown in fig. 2, a plurality of axial limiting grooves i are formed in the periphery of the second support plate 3 between the grooves i 3-1, a pressing block 8 made of rigid plastic is fixedly arranged in each limiting groove i, and the top of each pressing block 8 is an arc-shaped surface corresponding to an inner hole of the thin-wall aluminum alloy part and is higher than the periphery of the second support plate 3.

The second supporting disk 3 is provided with the screw or inlays the fixed block that has the screw in the bottom of spacing groove I, briquetting 8 is through passing fixing in spacing groove I of the screw 9 of screw.

As shown in fig. 3, a frustum 1-2 is coaxially arranged on one side of a mandrel 4 of the positioning disk 1, the first support disk 2 is an inner circular cone disk made of elastic plastic and is abutted against the frustum 1-2, and a gap is arranged between the end surfaces of the positioning disk 1 and the support disk 2.

The periphery of the first supporting disc 2 is a straight cylinder or a conical column, and a plurality of grooves II 2-1 extending towards the mandrel 4 are formed in the periphery of the first supporting disc 2 close to one side of the frustum 1-2 at intervals in the circumferential direction.

The periphery of first supporting disk 2 is spaced apart to be equipped with many along axial spacing groove II, II internal fixation of spacing groove are provided with rigid plastic's briquetting 8, briquetting 8's top is for the arcwall face corresponding with thin wall aluminum alloy part hole and be higher than the periphery of first supporting disk 2.

As shown in fig. 4 and 5, the mandrel 4 of the first support disc 2 and the second support disc 3 is further provided with at least one third support disc 10, the periphery of the third support disc 10 is provided with a plurality of axial limiting grooves iii at intervals, a pressing block 8 made of rigid plastic is fixedly arranged in each limiting groove iii, and the top of the pressing block 8 is an arc-shaped surface corresponding to the inner hole of the thin-wall aluminum alloy part and is higher than the periphery of the third support disc 10.

The third supporting disk 10 is an inner conical disk made of elastic plastic, a conical sleeve 11 which is abutted to the inner conical surface of the third supporting disk 10 and is sleeved on the mandrel 4 in a sliding mode is arranged on the inner conical surface of the third supporting disk, and two ends of the isolation sleeve 6 are respectively abutted to the end faces of the first supporting disk 2 and the third supporting disk 10, and the end faces of the conical sleeve 11 and the second supporting disk 3.

The periphery of the third supporting disk 10 is a straight cylinder or a conical column, and a plurality of grooves III 10-1 extending towards the mandrel 4 are formed in the periphery of the third supporting disk 10 close to one side of the taper sleeve 11 at intervals in the circumferential direction.

The angle of the conical surface is 30-60 degrees.

The first support disc 2, the second support disc 3 and/or the third support disc 10 are elastic plastic discs of PU (Polyurethane), NBR (nitrile butadiene rubber) or PE (polyethylene plastic).

The pressing block 8 is a plastic block of PPS (polyphenylene sulfide), PA66GF (glass fiber reinforced nylon), PEEK (polyether ether ketone), PAI (imide), PEI (polyetherimide).

The utility model discloses the working process is as follows:

as shown in fig. 4 and 5, in operation, the connecting part 1-1 of the positioning disc 1 is clamped on the jaw of the machine tool, the fastening nut 7 is rotated to enable the conical disc 5 to loosen the first supporting disc 2, and the first supporting disc 2, the second supporting disc 3 and the third supporting disc 10 retract to the centripetal part under the contraction action of the elastic plastic material of the first supporting disc 2, the second supporting disc 3 and the third supporting disc 10; then, a preprocessed workpiece 12 is sleeved on a third supporting disk 10 and a first supporting disk 2 from a second supporting disk 3, a fastening nut 7 is screwed to enable a conical disk 5 to abut against the first supporting disk 2, meanwhile, under the pushing of an isolating sleeve 6, an inner conical surface of the first supporting disk 2 is attached to a frustum 1-2 of a positioning disk 1, an inner conical surface of the third supporting disk 10 is attached to an outer conical surface of a conical sleeve 11, the first supporting disk 2, the second supporting disk 3 and the third supporting disk 10 expand outwards under the action of the outward expansion force of the conical surfaces, a pressing block 8 on the third supporting disk abuts against the inner circular surface of the preprocessed workpiece 12 to form support, and the clamping and positioning process is completed. After the processing is finished, the disassembly can be finished according to the clamping process or vice versa.

The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An internal expanding type clamp for thin-wall aluminum alloy parts is characterized by comprising a positioning disk (1), a first supporting disk (2), a second supporting disk (3), a mandrel (4), a conical disk (5) and an isolating sleeve (6), wherein one end of the positioning disk (1) is provided with a connecting part (1-1) connected with a clamping jaw of a processing machine tool, one end of the mandrel (4) is coaxially and fixedly connected with the positioning disk (1) far away from the connecting part (1-1), the first supporting disk (2) is coaxially connected with the mandrel (4) or the positioning disk (1) far away from the connecting part (1-1), one end of the mandrel (4) far away from the positioning disk (1) is provided with a thread section (4-1), the conical disk (5) is an external conical disk, the center of the conical disk is vertically provided with a through hole, and the conical disk is sleeved on the mandrel (4) near the thread section (4-1) in a sliding manner, the second supporting disk (3) is an inner conical disk made of elastic plastic and is abutted to the outer conical surface of the conical disk (5), the isolating sleeve (6) is sleeved on the mandrel (4) between the end surfaces of the first supporting disk (2) and the second supporting disk (3), and a fastening nut (7) capable of abutting against the end surface of the conical disk (5) is arranged on the threaded section (4-1) in a matched mode.

2. The internal expanding type clamp for the thin-wall aluminum alloy part as claimed in claim 1, wherein the periphery of the second support disk (3) is a straight cylinder or a conical cylinder, and a plurality of grooves I (3-1) extending towards the mandrel (4) are formed in the periphery of the second support disk (3) close to one side of the threaded section (4-1) at intervals in the circumferential direction.

3. The internal expanding type clamp for the thin-wall aluminum alloy part as claimed in claim 2, wherein a plurality of axial limiting grooves I (3-2) are formed in the periphery of the second supporting disk (3) between the grooves I (3-1), a rigid plastic pressing block (8) is fixedly arranged in each limiting groove I, and the top of each pressing block (8) is an arc-shaped surface corresponding to an inner hole of the thin-wall aluminum alloy part and is higher than the periphery of the second supporting disk (3).

4. The internal expanding fixture for the thin-wall aluminum alloy part as claimed in claim 3, wherein the second supporting disk (3) is provided with a screw hole or is embedded with a fixing block with a screw hole at the bottom of the limiting groove I, and the pressing block (8) is fixed in the limiting groove I through a screw (9) penetrating through the screw hole.

5. The internal expanding fixture for the thin-wall aluminum alloy part as claimed in claim 1, 2, 3 or 4, wherein the positioning disc (1) is coaxially provided with a frustum (1-2) on one side of the mandrel (4), the first supporting disc (2) is an elastic plastic internal conical disc and abuts against the frustum (1-2), and a gap is arranged between the end faces of the positioning disc (1) and the supporting disc (2).

6. The internal expanding type clamp for the thin-wall aluminum alloy part as claimed in claim 5, wherein the periphery of the first supporting disk (2) is a straight cylinder or a conical cylinder, and a plurality of grooves II (2-1) extending towards the mandrel (4) are formed in the periphery of the first supporting disk (2) close to one side of the frustum (1-2) at intervals in the circumferential direction.

7. The internal expanding type clamp for the thin-wall aluminum alloy part as claimed in claim 5, wherein a plurality of axial limiting grooves II are formed in the periphery of the first supporting disc (2) at intervals, rigid plastic pressing blocks (8) are fixedly arranged in the limiting grooves II, and the tops of the pressing blocks (8) are arc-shaped surfaces corresponding to inner holes of the thin-wall aluminum alloy part and are higher than the periphery of the first supporting disc (2).

8. The internal expanding type clamp for the thin-wall aluminum alloy part according to claim 5, wherein the mandrel (4) of the first supporting disk (2) and the mandrel (4) of the second supporting disk (3) are further provided with at least one third supporting disk (10), a plurality of axial limiting grooves III are formed in the periphery of the third supporting disk (10) at intervals, a pressing block (8) made of rigid plastic is fixedly arranged in each limiting groove III, and the top of each pressing block (8) is an arc-shaped surface corresponding to the inner hole of the thin-wall aluminum alloy part and is higher than the periphery of the third supporting disk (10).

9. The internal expanding fixture for the thin-wall aluminum alloy part as recited in claim 8, wherein the third support disk (10) is an internal conical disk made of elastic plastic, a conical sleeve (11) abutting against the internal conical surface of the third support disk (10) and slidably sleeved on the mandrel (4) is arranged on the internal conical surface of the third support disk, and two ends of the spacer sleeve (6) abut against the end surfaces of the first support disk (2) and the third support disk (10), and the conical sleeve (11) and the second support disk (3), respectively.

10. The internal expanding type clamp for the thin-wall aluminum alloy part as recited in claim 9, wherein the periphery of the third support disk (10) is a straight cylinder or a conical cylinder, and a plurality of grooves iii (10-1) extending towards the mandrel (4) are circumferentially arranged on the periphery of the third support disk (10) near one side of the conical sleeve (11) at intervals.