A self-centering flaring tooling for flared catheter ends

Abstract

The present invention discloses a self-centering flaring tooling for a flared catheter end, comprising: a mounting handle, a mandrel body and a self-centering structure; the mounting handle is assembled and connected to the first end of the mandrel body; the self-centering structure is coaxially assembled to the second end of the mandrel body; the self-centering structure includes: a cage, a thrust ball bearing, a flaring roller and a guiding roller; the cage is an integral structure including: a first cylinder, an intermediate cone and a second cylinder; the cylinder diameter of the second cylinder is smaller than that of the first cylinder; a plurality of first roller grooves for mounting the flaring rollers are arranged on the intermediate cone; a plurality of second roller grooves for mounting the guiding rollers are arranged on the second cylinder; the first roller grooves and the second roller grooves are arranged in a staggered manner. The present invention avoids the defects of the traditional process, such as the non-coaxiality between the equipment tooling and the catheter flaring, the uneven outer diameter and wall thickness of the same batch, the unstable dimensions of different batches of pipe materials, and the need to rely on manual skills to achieve relatively good quality stability transition.

Description

Technical Field

[0001] The invention relates to the technical field of catheter expansion tooling, in particular to a self-centering expansion tooling for an expansion type catheter end. Background Art

[0002] Most aviation tubes and conduits are flared, and using flaring tooling to flare the conduit end is a very common processing method in the aviation field. At present, the flared conduit end processing mainly adopts manual flaring, which is highly dependent on people. The flaring quality is closely related to the equipment condition and the operator's operating skill level and is difficult to guarantee, which poses certain quality risks. In order to avoid this problem, it is particularly important to develop a method that can eliminate the unstable operation caused by equipment factors and human factors and improve the quality of conduit flaring.

[0003] At present, there are two types of expansion tools used in traditional expansion methods, one is the 74° conical expansion tool, and the other is the straight-push conical three-pin expansion tool. Both expansion methods have certain defects. The 74° conical expansion is divided into the eccentric 74° expansion tool (such as Figure 1 As shown, 1-1, expansion catheter; 1-2, eccentric 74° conical expansion tool) and two-ribbed 74° conical expansion tool (such as Figure 2 As shown, 2-1, expanded catheter; 2-2, two-ribbed 74° conical expansion tool), the eccentric 74° expansion tool requires a expansion tool and an outer clamping die for profiling and fixing. During the expansion process, the expansion head is adjusted eccentrically, and the catheter end is expanded by the eccentric extrusion of the conical tool, and the outer wall of the catheter is pressed into the tool to realize the expansion function. Because the tool relies on eccentric adjustment and rotation of the conical head to expand during extrusion, the expanded catheter has defects such as uneven expansion, poor surface roughness, stable dimensional control, and eccentricity after expansion. In addition, due to the repeated use of the conical tool and the friction with the catheter, the tool also has defects such as easy wear (see the principle of eccentric expansion). Figure 1 ). The two-flute 74° conical expansion tooling is generally used for the expansion of aluminum alloy conduits. After expansion, there are also many defects such as easy expansion eccentricity, easy cracking, and easy wear of the tooling. Summary of the invention

[0004] In order to avoid the above-mentioned problems, by analyzing and studying the expansion forming process and mechanism, the present invention provides a self-centering expansion tool for the expansion type catheter end, which can solve the technical problems of easy eccentricity, easy cracking and easy wear of the tool in traditional expansion.

[0005] To this end, the present invention provides the following technical solutions:

[0006] The present invention provides a self - centering flaring tooling for the end of a flared catheter. The flaring tooling includes: a mounting handle, a mandrel body, and a self - centering structure; the mounting handle is assembled and connected to the first end of the mandrel body; the self - centering structure is coaxially assembled to the second end of the mandrel body;

[0007] Among them, the self - centering structure includes: a cage coaxially assembled with the second end of the mandrel body, a thrust ball bearing assembled between the mandrel body and the cage, flaring rollers, and guiding rollers;

[0008] The cage is an integral structure, including: a first cylinder assembled and connected with the thrust ball bearing, a second cylinder, and an intermediate cone located between the first cylinder and the second cylinder; the cylinder diameter of the second cylinder is smaller than that of the first cylinder; several first roller grooves are arranged on the intermediate cone, and the flaring rollers are installed in the first roller grooves; several second roller grooves are arranged on the second cylinder, and the guiding rollers are installed in the second roller grooves; the first roller grooves and the second roller grooves are arranged in a staggered manner.

[0009] Furthermore, it further includes: a nut; the nut passes through the self - centering structure and is assembled and connected with the mandrel body, and encloses the thrust ball bearing inside the nut.

[0010] Furthermore, the number of rollers increases according to the pipe diameter.

[0011] Furthermore, the number of guiding rollers is the same as that of the flaring rollers.

[0012] Furthermore, the flaring device is a Morse taper shank.

[0013] Furthermore, the mandrel, cage, flaring rollers, and guiding rollers are designed with corresponding dimensions according to catheters of different outer diameters and inner diameters.

[0014] Furthermore, the mounting handle is designed according to the interfaces of different devices.

[0015] Advantages and positive effects of the present invention: In the self - centering flaring tooling for the end of a flared catheter of the present invention, the structural design avoids the defects of traditional processes, such as the non - coaxiality between the equipment tooling and the catheter flaring, the uneven outer diameter and wall thickness of the same batch, the unstable dimensions of different batches of pipe materials, and the need to rely on manual skills to achieve relatively good quality stability transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a structural schematic diagram of an eccentric 74° flaring tooling in the prior art;

[0018] Figure 2 It is a structural schematic diagram of a two-ridge 74° conical flaring tooling in the prior art;

[0019] Figure 3 It is a structural schematic diagram of a self-centering flaring tooling for a flared catheter end in an embodiment of the present invention;

[0020] Figure 4 It is a structural schematic diagram of a self-centering flaring tooling for a flared catheter end in an embodiment of the present invention;

[0021] Figure 5 It is a structural schematic diagram of a self-centering flaring tooling for a flared catheter end in an embodiment of the present invention;

[0022] In the figure, 1 is a mounting handle; 2 is a mandrel body; 3 is a cage; 4 is a thrust ball bearing; 5 is a flaring roller; 6 is a guiding roller; 7 is a nut; 8 is a catheter; 9 is a main body. Detailed implementation manners

[0023] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] As Figures 3 to 5 shown, it shows a self-centering flaring tooling for a flared catheter end in an embodiment of the present invention. This tooling includes: a mounting handle 1, a mandrel body 2, a cage 3, a thrust ball bearing 4, a flaring roller 5, a guiding roller 6, and a nut 7. Among them: the mounting handle 1 is screwed to the mandrel body 2, the mandrel body 2 is coaxially assembled with the cage 33, and the thrust ball bearing 4 forms an isolation between the mandrel body 2 and the cage 3.

[0025] The cage 3, thrust ball bearing 4, flared roller 5 and guiding roller 6 form a self-centering structure. The cage 3 is an integral structure, including: a first cylinder, a second cylinder assembled and connected with the thrust ball bearing 4, and an intermediate cone located between the first cylinder and the second cylinder; the cylinder diameter of the second cylinder is smaller than that of the first cylinder; a number of first roller grooves are arranged on the intermediate cone, and the flared rollers 5 are installed in the first roller grooves; the number of flared rollers 5 increases according to the pipe diameter, generally 3 to 12 pieces. A number of second roller grooves are arranged on the second cylinder, and the guiding rollers 6 are installed in the second roller grooves; the first roller grooves and the second roller grooves are arranged in a staggered manner, and the number of guiding rollers 6 is the same as that of the flared rollers 5.

[0026] The flared rollers 5 and the guiding rollers 6 are both installed from the inside to the outside of the bushing. The tapered groove design of the bushing can ensure that the rollers will not fall out and the protruding dimension. After the rollers are installed, tighten the nut 7 with the bushing body to complete the assembly of the tooling.

[0027] The front mounting handle 1 can be designed according to the interfaces of different equipment. The conventional flaring equipment is a Morse taper shank, and it can also be made into other connection forms according to the equipment interface. The mandrel body 2, cage 3, flared rollers 5 and guiding rollers 6 will be designed with corresponding dimensions according to the conduits with different outer diameters and inner diameters. The number of rollers is equipped according to the specification size. This structure can ensure the stable flaring of the pipes with an outer diameter in the range of φ5 to φ100.

[0028] The working method of the above flared conduit end self-centering flaring tooling is as follows:

[0029] The tooling is connected to the flaring equipment. After the flaring equipment is started, the flaring tooling starts to rotate and advance. The front guiding part of the cage 3 can smoothly enter the conduit to be flared as a guide. When the feeding position of the tooling reaches the position of the guiding rollers or the position to be flared, the front guiding rollers always maintain the guiding state. If there is a coaxial deviation between the conduit and the flaring tooling, it will cause the inner wall of the conduit to contact the rollers. Through the rotation of the tooling and the self-rotation of the rollers, automatic guiding can be achieved without damaging the conduit. Therefore, the centering function can be maintained during the flaring process. This structure can avoid the situation of inaccurate centering due to the wall thickness and tolerance of the pipe, or the flaring eccentricity caused by the eccentricity of the equipment, the non-coaxiality of the tooling position and the conduit clamping. At the same time, the free rotation of the rollers can avoid the extrusion damage to the pipe and improve the service life of the needle rollers.

[0030] When the feeding position of the tooling reaches the flaring roller 5, the catheter flaring begins. The flaring roller 5 is fixed by the cage 3, limited and the angle is controlled by the internal taper of the mandrel body 2, and flaring is carried out under the action of self-centering force, which can ensure the coaxiality of the flaring and also ensure the flaring angle. The free rotation of the roller during the flaring process can obtain a very good surface state. Due to the large axial force during the flaring process, the built-in thrust ball bearing 4 can ensure the stability of the flaring process, and at the same time solve the problems of unstable flaring offset caused by large thrust and the influence of thrust on reducing the tooling life during the flaring process. The front-end guiding roller 6 and the flaring roller 5 are in a staggered state, avoiding the unstable state of free forming at the corner R of the traditional roller flaring. At the same time, due to the large contact surface of the centering structure of this tooling, and the design size of the roller can clearly observe the size state of the flaring, it can effectively avoid the situation of catheter cracking caused by excessive flaring.

[0031] The structural design of the flaring tooling in this embodiment avoids the defects of the traditional process, such as the non-coaxiality between the equipment tooling and the catheter flaring, the uneven outer diameter and wall thickness of the same batch, the unstable dimensions of different batches of pipe materials, and the need to rely on manual skills to achieve relatively good quality stability transition.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-centering flaring tooling for the end of a flared catheter, characterized in that, The flaring tooling includes: a mounting handle (1), a mandrel body (2), and a self-centering structure; the mounting handle (1) is assembled and connected to the first end of the mandrel body (2); the self-centering structure is coaxially assembled to the second end of the mandrel body (2). Wherein, the self-centering structure includes: a cage (3) coaxially assembled to the second end of the mandrel body (2), a thrust ball bearing (4) assembled between the mandrel body (2) and the cage (3), a flaring roller (5), and a guiding roller (6). The cage (3) is an integral structure, including: a first cylinder, a second cylinder assembled to the thrust ball bearing (4), and an intermediate cone located between the first cylinder and the second cylinder; the cylinder diameter of the second cylinder is smaller than that of the first cylinder; a plurality of first roller grooves are arranged on the intermediate cone, and the flaring rollers (5) are installed in the first roller grooves; a plurality of second roller grooves are arranged on the second cylinder, and the guiding rollers (6) are installed in the second roller grooves; the first roller grooves and the second roller grooves are arranged in a staggered manner.

2. The self-centering flaring tooling for the flared catheter end according to claim 1, characterized in that, It further includes: A nut (7); the nut (7) passes through the self-centering structure and is assembled and connected to the mandrel body (2), and the thrust ball bearing (4) is surrounded inside the nut (7).

3. A self-centering flaring tool for a flared catheter end according to claim 1, characterized in that, The number of the rollers increases according to the pipe diameter size.

4. A self-centering flaring tool for a flared catheter end according to claim 1, characterized in that, The number of the rollers is the same as that of the flaring rollers (5).

5. A self-centering flaring tooling for a flared catheter end according to claim 1, characterized in that The flaring device is a Morse taper shank.

6. The self - centering flaring tool for the flared catheter end according to claim 1, characterized in that, The mandrel body (2), the cage (3), the flaring rollers (5), and the guiding rollers (6) are designed with corresponding dimensions according to the ducts with different outer diameters and inner diameters of different specifications.

7. A self-centering flaring tool for a flared catheter end according to claim 1, characterized in that The mounting handle (1) is designed according to the interfaces of different devices.

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