CN116586526B - Tooling fixture for heat setting of alloy bracket and application method thereof - Google Patents

Abstract

The application provides a fixture for heat setting of an alloy bracket and a use method thereof, which relate to the technical field of medical instrument manufacturing, and the fixture is characterized in that an expansion shaft is inserted into the bracket to be formed to contact the inner surface of the bracket to be formed, so that the bracket to be formed is expanded; the first clamp and the second clamp can be respectively sleeved on the outer surface of the bracket to be formed, and the first clamp and the second clamp are extruded and shaped from the outer side and the inner side of the expansion shaft to the bracket to be formed, so that the bracket to be formed is kept in an expanded state; when the first side wing fixed surface arranged on the first clamp and the second side wing fixed surface arranged on the second clamp are in butt joint, the side wings of the bracket to be formed enter the first groove, so that the expansion and shaping of the side wings are realized independently, and the side wings are kept in an outwards convex state; the application is clamped by the first clamp and the second clamp in a matched way, so that the cylindrical structure is provided with the overhanging structural support.

Description

Tooling fixture for heat setting of alloy bracket and application method thereof

Technical Field

The application relates to the technical field of medical instrument manufacturing, in particular to a fixture for heat setting of an alloy bracket and a use method thereof.

Background

In recent years, the incidence rate of cardiovascular and cerebrovascular diseases in China is increased year by year, the death rate is increased year by year over other diseases such as cancers, and stent implantation is a common mode for treating the cardiovascular and cerebrovascular diseases. Nickel-titanium alloy is often used as a material for manufacturing various types of cardiovascular and cerebrovascular stents due to its excellent biocompatibility, shape memory function and mechanical properties.

When a non-woven nickel-titanium alloy bracket is manufactured, a pipe with a smaller pipe diameter is generally selected, a required structure is cut through laser, then shaping is completed through multiple expansions and heat treatment, and a work fixture for heat shaping determines the structure of the bracket during plastic deformation in the heat treatment process.

At present, the traditional nickel-titanium alloy bracket can only be used for shaping and processing a cylindrical bracket, and cannot be used for processing a bracket with other overhanging structures on a cylindrical structure. It is a technical problem that needs to be solved at present for a person skilled in the art how to design a forming device with an overhanging structural support on a cylindrical structure.

Disclosure of Invention

The application provides a fixture for heat setting of an alloy bracket, which can set and process the alloy bracket with side wings, and the concrete scheme is as follows:

a tooling fixture for heat setting of an alloy bracket, comprising:

the expansion shaft is used for being inserted into the to-be-formed bracket to realize expansion of the to-be-formed bracket;

the first clamp is sleeved outside the bracket to be formed and is used for shaping the outer surface of the main body part of the bracket to be formed;

the second clamp is sleeved outside the bracket to be formed;

the first side wing fixing surface and/or the second side wing fixing surface are/is provided with a first groove, and the first groove is used for accommodating and shaping the side wings of the bracket to be formed.

Optionally, a first outer Peng Ganding profile is arranged at one end of the second clamp, a positioning table is arranged at one end of the expansion shaft, and a second outer Peng Ganding profile is arranged on the positioning table; the first outer side Peng Gan shaping surface and/or the second outer side Peng Gan shaping surface are provided with a second groove for accommodating and shaping the outer side Peng Gan of the bracket to be shaped.

Optionally, the outer wall protrusion of expansion axle sets up the location arch, the inner wall of first anchor clamps with the inner wall of second anchor clamps sets up respectively and can dock the constant head tank of intercommunication, the location arch with constant head tank cooperation cartridge is in order to realize circumference location.

Optionally, the number of the positioning protrusions is equal to the number of the side wings of the to-be-formed bracket, and the positioning protrusions are used for contacting with the bottom end of the large mesh of the to-be-formed bracket.

Optionally, the positioning protrusion is provided with a guiding inclined plane, and the positioning protrusion ejects the side wing of the bracket to be formed outwards through the guiding inclined plane.

Optionally, the lower end of the expansion shaft is provided with a tapered surface, and the outer diameter of the tapered surface gradually decreases from top to bottom.

Optionally, the first fixture is provided with first inclined planes with the same number as the side wings of the bracket to be formed, the second fixture is provided with second inclined planes with the same number as the side wings of the bracket to be formed, the first inclined planes are in one-to-one correspondence contact with the second inclined planes, and each group of the first inclined planes and the second inclined planes are used for forming the side wings of the bracket to be formed.

Optionally, an inner wall of the first clamp is provided with an annular boss for defining an end position of the bracket main body portion to be formed.

Optionally, the second fixture comprises at least two split bodies capable of being separated along the circumferential direction.

Optionally, the outer surface of the expansion shaft, the inner surface of the first clamp and the inner surface of the second clamp are used for shaping the to-be-shaped bracket, and the to-be-shaped bracket is cylindrical, prismatic, convex or concave.

The application also provides a use method of the tooling fixture for heat setting of the alloy bracket, which is applied to any one of the tooling fixture for heat setting of the alloy bracket, and comprises the following steps:

inserting an expansion shaft into the undeployed bracket to be formed, so that the main body part of the bracket to be formed is fully expanded and unfolded, and the side wings and the outward expansion rods are not fully expanded and unfolded;

the two split parts of the second clamp are closed, and the circumferential positioning of the second clamp is completed through the matching of the positioning bulge and the positioning groove;

the expansion shaft moves axially to enable the first outer Peng Gan shaping surface of the second clamp to be in contact with the second outer Peng Gan shaping surface of the expansion shaft to finish shaping of the outer Peng Gan; the side wings are ejected out through the positioning protrusions, and meanwhile, the lower parts of the positioning protrusions contact the bottom ends of the large meshes of the bracket to be formed;

the first clamp completes circumferential positioning through the matching of the positioning protrusion and the positioning groove, and moves along the axial direction until the first inclined surface of the first clamp contacts with the second inclined surface of the second clamp, and shaping of the side wings is completed.

Compared with the prior art, the application provides the tooling fixture for heat setting of the alloy bracket, which is characterized in that an expansion shaft is inserted into the bracket to be formed to contact the inner surface of the bracket to be formed, so that the bracket to be formed is expanded; the first clamp and the second clamp can be respectively sleeved on the outer surface of the bracket to be formed, and the first clamp and the second clamp are jointly extruded and shaped from the outer side and the inner side of the expansion shaft to the bracket to be formed, so that the bracket to be formed is kept in an expanded state; when the first side wing fixed surface arranged on the first clamp and the second side wing fixed surface arranged on the second clamp are in butt joint, the side wings of the bracket to be formed enter the first groove, so that the expansion and shaping of the side wings are realized independently, and the side wings are kept in an outwards convex state; the application is clamped by the first clamp and the second clamp in a matched way, so that the cylindrical structure is provided with the overhanging structural support.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of a specific embodiment of a tooling fixture for heat setting an alloy bracket provided by the application;

FIG. 2 is a schematic diagram showing the relationship between an explosion diagram of a specific embodiment of a tooling fixture for heat setting an alloy bracket and a bracket to be molded;

FIG. 3 is a front view of one embodiment of an expansion shaft;

FIG. 4 is a bottom view of one embodiment of an expansion shaft;

FIG. 5 is an isometric view of an embodiment of a first clamp;

FIG. 6 is a schematic illustration of one of the split embodiments of the second clamp arrangement;

FIG. 7 is a schematic view of a second clamp in an embodiment with two separate parts;

FIG. 8 is a schematic view of three different configurations of an expansion shaft;

FIG. 9 is a schematic illustration of the insertion of an expansion shaft into an undeployed stent to be formed;

FIG. 10 is a schematic illustration of the process of two parts of the second clamp abutting each other;

FIG. 11 is a schematic illustration of the process of axially moving the expansion shaft relative to the second clamp;

FIG. 12 is a schematic illustration of a process of axially moving a cartridge of a first clamp relative to an expansion shaft;

fig. 13 is a schematic structural view of a stent to be formed after cutting and forming a tube.

The drawings include:

the expansion shaft 1, the second outer Peng Gan shaping surface 101, the tapered surface 102, the first clamp 2, the first inclined surface 201, the annular boss 202, the second clamp 3, the first outer Peng Ganding shaping surface 301, the second inclined surface 302, the first groove 4, the second groove 5, the positioning protrusion 6 and the positioning groove 7.

Detailed Description

The application aims at providing a tooling fixture for heat setting of an alloy bracket, which can set and process the alloy bracket with side wings.

In order to make the technical scheme of the application better understood by those skilled in the art, the application relates to a fixture for heat setting an alloy bracket and a use method thereof, which are described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 and 2, wherein a represents a main body portion of a stent to be formed, B represents a side wing, C represents an outer Peng Gan, D represents a large mesh of the stent, three side wings and an outer Peng Gan are respectively provided, fig. 2 shows a state after the stent to be formed is unfolded, fig. 13 shows a state before the stent to be formed is unfolded, the side wings extend obliquely downward, the outer Peng Gan extends obliquely upward, the main body portion of the stent to be formed can be regarded as a cylindrical structure formed by meshes, and the side wings and the outer Peng Gan protrude outside the main body portion of the stent. It should be noted that, the directions shown in the drawings are for convenience of description, and do not represent that the use is necessarily performed according to the state, and the directions can be used upside down or transversely; the concepts of upper, lower, etc. directions in the specification are shown with reference to their corresponding drawings for convenience of description.

The application provides a fixture clamp for heat setting of an alloy bracket, which comprises an expansion shaft 1, a first clamp 2 and a second clamp 3, wherein the expansion shaft 1 is used as an inner core, the first clamp 2 and the second clamp 3 are used as shells together, and the expansion shaft 1 is used for being inserted into the bracket to be formed to realize expansion of the bracket to be formed; the first clamp 2 is sleeved outside the bracket to be formed and is used for shaping all or part of the outer surface of the main body part of the bracket to be formed; the second clamp 3 is sleeved outside the bracket to be formed, the second clamp 3 is used for shaping the side wings of the bracket to be formed, preferably, the second clamp 3 can also be used for partially shaping the outer surface of the main body part of the bracket to be formed, namely, the outer side surface of the expansion shaft 1, the inner side surface corresponding to the outer side surface of the first clamp 2 and the outer side surface of the expansion shaft 1, the inner side surface corresponding to the outer side surface of the expansion shaft 1 and the main body part of the bracket to be formed are combined to form the main body part of the bracket to be formed, and the clamp for shaping the outer surface of the main body part of the bracket to be formed adopts split arrangement, namely, the clamp is divided into the first clamp 2 and the second clamp 3, so that the design and the processing are convenient. In the embodiment shown in the drawings of the application, the expansion shaft 1 is used for shaping the inner surface of the main body part of the bracket to be formed, the first clamp 2 is used for shaping the outer surface of the main body part of the bracket to be formed, and the first clamp 2 and the second clamp 3 are matched for shaping the side wings of the bracket to be formed.

The first fixture 2 and the second fixture 3 are two mutually independent structures, one end (upper end in fig. 2) of the first fixture 2 is provided with a first flank fixed surface, one end (lower end in fig. 2) of the second fixture 3 is provided with a second flank fixed surface, the first flank fixed surface and the second flank fixed surface can be mutually butted, the surface trends of the first flank fixed surface and the second flank fixed surface are the same, and the first flank fixed surface and the second flank fixed surface can be mutually contacted and matched to form extrusion. In the drawings of the application, the upper end surface of the first clamp 2 is a first flank fixed surface, and the lower end surface of the second clamp 3 is a second flank fixed surface; in addition, the first side wing fixed surface and the second side wing fixed surface can adopt different shapes, such as inclined planes or concave-convex matched curved surfaces.

The first flank setting surface and/or the second flank setting surface are provided with a first groove 4, and the first groove 4 is used for accommodating the flank of the bracket to be molded. The first grooves 4 may have different arrangements, and the first grooves 4 may be provided on only one of the first side wing fixing surface or the second side wing fixing surface; the first groove 4 may be partially disposed on the first side wing fixing surface, and partially disposed on the second side wing fixing surface, where the first side wing fixing surface and the second side wing fixing surface are abutted to each other to form the first groove 4. As shown in fig. 2 and 7, the first groove 4 of this embodiment is provided only on the second flank (lower end surface of the second jig 3), and the first flank (upper end surface of the first jig 2) is a smooth surface, and no groove structure is provided. The depth of the first recess 4 is such as to fully accommodate the flank. The first recess 4 is provided only on one of the parts, which can reduce the number of processing steps; the diameter of the first groove 4 should generally be slightly larger than the diameter of the flanks to facilitate entry and exit.

As another embodiment, besides the side wings of the first side wing fixing surface and/or the second side wing fixing surface, the first groove 4 fixing support may be provided with a step structure on the end surface of the first clamp 2 and/or the end surface of the second clamp 3, for example, a step structure may be provided on the lower end surface of the second clamp 3, the side wall of the step corresponds to the shape of the side wing, the two surfaces of the step height are both planes, the upper end surface of the first clamp 2 is a plane, the plane with a higher step structure and the upper end surface of the first clamp 2 can be in contact superposition, the side wing can be limited in a cavity formed by two matched end surfaces of the first clamp 2 and the second clamp 3 during the side wing forming, and the side wing edge is in contact with the side wall of the step.

When manufacturing the bracket, cutting out a pipe with smaller pipe diameter, as shown in fig. 13, cutting out a required structure by laser to form a bracket to be formed, and expanding and shaping the bracket to be formed; during shaping, the expansion shaft 1 is inserted into the to-be-shaped bracket from the upper part, so that the to-be-shaped bracket expands to the periphery and the diameter is increased; respectively sleeving a first clamp 2 and a second clamp 3 outside the bracket to be formed, and extruding and shaping the bracket to be formed by the outer shell formed by the first clamp 2 and the second clamp 3 and the inner core formed by the expansion shaft 1; the shaping flank can be clamped between the first clamp 2 and the second clamp 3, so that the flank protrudes out of the main body part of the bracket to be shaped. And (5) heating to keep the to-be-formed bracket in an expanded state, and shaping the formed bracket structure.

According to the tooling fixture for heat setting of the alloy bracket, provided by the application, the bracket provided with the side wings can be set by mutually matching the three components of the expansion shaft 1, the first fixture 2 and the second fixture 3, the side wings protrude out of the main body of the bracket to be formed, and the processing of the bracket with the overhanging structure on the cylindrical structure can be realized.

On the basis of the scheme, with reference to fig. 3, 4, 6 and 7, the application sets a first outer Peng Ganding molded surface 301 at the upper end of the second clamp 3, sets a positioning table at the upper end of the expansion shaft 1, and sets a second outer Peng Gan molded surface 101; the inner diameter of the first outer Peng Ganding profile 301 increases gradually from bottom to top; the positioning table is an expansion structure arranged at the upper end of the expansion shaft 1, and the outer diameter of the second outer Peng Gan fixed surface 101 is gradually increased from bottom to top; the second outer profile Peng Gan is identical to the first outer profile Peng Ganding in shape and can be in contact with each other to form a contact press without regard to the configuration of the surface-provided grooves or the like.

The first outer Peng Ganding profile 301 and/or the second outer Peng Gan shaping surface 101 are provided with a second recess 5, the second recess 5 being adapted to receive an outer Peng Gan of a shaped stent to be shaped. The second groove 5 has two arrangement forms, and the second groove 5 can be arranged on one of the surface of the first outer Peng Ganding molded surface 301 or the surface of the second outer Peng Gan molded surface 101; the second groove 5 may be partially disposed on the surface of the first outer surface Peng Ganding mold surface 301, and partially disposed on the surface of the second outer surface Peng Gan mold surface 101, and be surrounded by both portions. In the embodiment provided by the drawing, only the second groove 5 is arranged on the first outer Peng Ganding molded surface 301, and the outer surface of the second outer Peng Gan molded surface 101 is not provided with a groove structure and is a smooth curved surface. The second recess 5 is of a depth to accommodate the outer Peng Gan; the diameter of the second groove 5 should generally be slightly larger than the diameter of the outer wand to facilitate entry and exit. As another embodiment, in addition to the outer expansion rod of the second groove 5 shaping bracket provided on the first outer Peng Ganding shaping surface 301 and/or the second outer Peng Gan shaping surface 101, a step structure may be provided on the second outer Peng Gan shaping surface 101 of the positioning table and/or the first outer Peng Ganding shaping surface 301 of the second clamp 3, for example, a step structure may be provided on the first outer Peng Ganding shaping surface 301 of the second clamp 3, a side wall of the step corresponds to the shape of the outer Peng Gan, both surfaces of the step height are curved surfaces, the second outer Peng Gan shaping surface 101 is a curved surface, a curved surface with a higher step structure is substantially in contact with the second outer Peng Gan shaping surface 101, and an edge of the outer Peng Gan is in contact with a side wall of the step in a cavity formed by the step structure during shaping of the outer Peng Gan.

It should be noted that, the curved surface generatrix of the first outer Peng Ganding molding surface 301 and the second outer Peng Gan molding surface 101 adopted in the application is preferably a spline curve, and may be a straight line; for the modeling that the curved surface generatrix is a straight line, the whole space shape is conical. For other configurations referred to herein that employ a tapered or curved shape, this shape may be employed.

Referring to fig. 2, 3 and 4, the outer wall of the expansion shaft 1 is provided with a positioning protrusion 6 in a protruding manner, and the positioning protrusion 6 is of a block structure protruding from the outer wall of the expansion shaft 1; with reference to fig. 5, 6 and 7, the inner wall of the first clamp 2 and the inner wall of the second clamp 3 are respectively provided with a positioning groove 7 which can be in butt joint and communication, the positioning groove 7 is an elongated groove arranged on the inner wall of the first clamp 2 and the inner wall of the second clamp 3, the positioning groove 7 arranged by the first clamp 2 and the positioning groove 7 arranged by the second clamp 3 extend along the axial direction, the positioning bulge 6 can move between the two sections of positioning grooves 7, and the depth of the positioning groove 7 is larger than the protruding height of the positioning bulge 6. It should be noted that, in the drawings of the present application, the positioning groove 7 provided in the second clamp 3 is provided to penetrate up and down on the inner wall, and the positioning groove 7 provided in the first clamp 2 is provided only in an upper position. In the drawings of the application, three positioning protrusions 6 are arranged, and correspondingly, three groups of positioning grooves 7 are arranged in a matching manner, so that when the positioning protrusions 6 are correspondingly inserted into the positioning grooves 7, the expansion shaft 1 cannot rotate circumferentially.

The number of the positioning protrusions 6 is equal to the number of the side wings of the bracket to be formed, three positioning protrusions 6 are arranged in the embodiment shown in the attached drawings, the positioning protrusions 6 are used for being in contact with the bottom end of the big mesh of the bracket to be formed, and when the expanding shaft 1 expands the pipe, the pipe is slid along the axial direction of the expanding shaft 1 until the positioning protrusions 6 are in contact with the bottom end of the big mesh of the bracket to be formed, and the side wings are outwards ejected by the positioning protrusions 6 due to the fact that the side wings are distributed along the edge of the big mesh in an undeployed state, referring to fig. 2, 9 and 10.

Referring to fig. 3, in this embodiment, the positioning protrusion 6 is disposed at a middle position in the axial direction of the expansion shaft 1, and the position of the positioning protrusion 6 on the expansion shaft 1 is determined by the structure of the stent to be formed, so as to ensure that the distance from the lowest point of the positioning protrusion 6 to the lower bottom surface of the positioning table is consistent with the axial distance from the lowest point of the large mesh of the stent in the unfolded state to the support point Peng Gan outside the stent. The purpose is to ensure that the positioning bulge can eject the flank after the expansion shaft is moved downwards. The stent to be formed according to the present application has various states including a non-expanded state after cutting (shown in fig. 13), a state after expanding the expansion shaft (shown in fig. 10), and a finally-shaped expanded state (shown in fig. 2).

As shown in fig. 3, the positioning protrusion 6 of the present application is provided with a guiding slope, and the positioning protrusion 6 ejects the side wing of the bracket to be formed outwards through the guiding slope. The guide inclined planes arranged by the positioning protrusions 6 are different in height protruding from the outer surface of the expansion shaft 1 along each position in the axial direction, and the protruding height of the guide inclined planes is gradually increased from bottom to top, is minimum near one end of the bracket to be formed, and is gradually increased towards the other end along the axial direction in combination with fig. 3. When the expansion shaft 1 is inserted from top to bottom, each side wing corresponds to at least one positioning protrusion 6, and as the positioning protrusions 6 protrude out of the outer surface of the expansion shaft 1, the positioning protrusions 6 can eject the side wings outwards, so that the side wings protrude out of the main body part of the bracket to be formed, and the side wings automatically reach the position between the first clamp 2 and the second clamp 3. It should be noted that, in the structure provided by the present application, each side wing is correspondingly provided with a positioning protrusion 6, and the positioning protrusion 6 can contact and eject the main body portion of the bracket to be formed of the side wing, so that the structure is only used as a preferred scheme, if necessary, more than two positioning protrusions 6 can be provided for each side wing, and all the specific implementation manners are included in the protection scope of the present application.

In the cut pipe structure, the side wings are mutually clung to the bracket main body, and the side wings, the bracket main body and the outer Peng Gan are all formed by cutting the pipe wall of the pipe in a combined mode as shown in fig. 13; referring to fig. 10, when the expansion shaft 1 is inserted to expand, the side wings and the large mesh edges are expanded together by the outer surface of the expansion shaft 1, and the guide inclined surfaces provided by the positioning protrusions 6 are used for ejecting the side wings out of the large mesh edges so that the side wings are tilted from the outer side surface of the main body part of the bracket to be formed; then the positioning bulge 6 contacts with the bottom end of the big mesh of the bracket to be formed, the positioning bulge 6 completes the circumferential positioning of the bracket to be formed, and the expansion shaft 1 moves downwards at the moment and moves downwards together with the bracket to be formed, and the bottom surface of the positioning bulge 6 is clamped at the bottom end of the big mesh.

With reference to fig. 3, the lower end of the expansion shaft 1 is provided with a tapered surface 102, the tapered surface 102 can be a tapered surface, or can be in other curved surface shapes, the outer diameter of the tapered surface 102 gradually decreases from top to bottom along the axial direction, the support to be formed can be conveniently inserted through the tapered surface 102, the tip end of the tapered surface 102 close to the lower end is small in size, the support to be formed is firstly stretched into the support to be formed, the support to be formed is gradually expanded through the surface of the tapered surface 102, and finally, the support to be formed is supported by the cylindrical body part with the larger outer diameter of the expansion shaft 1, so that the main body part of the support to be formed is kept in a forming state. The whole expansion shaft 1 is provided with a positioning table, a columnar body and a tapered surface 102 from top to bottom in sequence, so that a structure with a protruding upper end and a shrinking lower end is formed. The bottom tip of the tapered surface 102 is of a semicircular structure to prevent accidents due to sharp tips.

The upper end face of the first clamp 2 is provided with first inclined planes 201 equal to the number of the side wings of the bracket to be formed, the lower end face of the second clamp 3 is provided with second inclined planes 302 equal to the number of the side wings of the bracket to be formed, and three first inclined planes 201 and three second inclined planes 302 are respectively provided and correspond to the three side wings. It should be noted that, in one embodiment mentioned later, the second fixture 3 is formed by splicing two or more separate bodies, and the second inclined plane 302 is formed by providing three of the integral structures formed after splicing. The first inclined planes 201 and the second inclined planes 302 are in one-to-one correspondence contact, one first inclined plane 201 and one second inclined plane 302 are matched to form a group, and each group of the first inclined planes 201 and the second inclined planes 302 are used for forming side wings of the bracket to be formed. The first inclined plane 201 and the second inclined plane 302 are contacted with each other, so that the first clamp 2 and the second clamp 3 can play a role of circumferential positioning and are matched with the extrusion shaping flank. The second groove 5 is provided on the second inclined surface 302. The axial angle of the first inclined plane 201 and the second inclined plane 302 should be consistent with the axial angle of the flank.

The inner wall of the first clamp 2 is provided with an annular boss 202, the annular boss 202 being used to define the end position of the body portion of the bracket to be formed. Referring to fig. 4 and fig. 5, the annular boss 202 is a circular boss protruding from the inner wall of the first fixture 2, and the annular boss 202 may be a circular integral structure or may be a plurality of independent protrusions distributed along the circumference. By defining the end of the main body portion of the bracket to be formed by the annular boss 202, as shown in fig. 12, when the first clamp 2 moves upward to a proper position, the annular boss 202 can contact the lower edge of the main body portion of the bracket to be formed, and can locate the end of the main body portion to define the axial position of the main body portion.

On the basis of any one of the above technical solutions and their mutual combination, the second clamp 3 of the present application comprises at least two split bodies that can be separated in the circumferential direction. Fig. 6 and 7 are two split structures, that is, the second clamp 3 is split into two split parts along the axial direction, and the two split parts are butted to form the annular second clamp 3. As shown by the arrow in fig. 2, at the time of setting, the two split bodies of the second clamp 3 are brought close to each other, the first clamp 2 is moved upward, and the expansion shaft 1 is moved downward. In the embodiment shown in the drawings, the second clamp 3 adopts a two-split structure, which is only a preferred scheme, and the second clamp 3 can be divided into a plurality of split parts, for example three, and the specific embodiment is also included in the protection scope of the present application.

Specifically, the outer surface of the expansion shaft 1, the inner surface of the first clamp 2 and the inner surface of the second clamp 3 are cylindrical surfaces, prismatic surfaces, outer convex surfaces or inner concave surfaces of the parts for shaping the bracket to be shaped. In the structure shown in fig. 1 to 3, the outer surface of the expansion shaft 1 is used for shaping the main body part of the bracket to be formed into a cylindrical surface, but the application does not exclude other structures, and the specific shape is required to be determined according to the appearance of the main body of the bracket to be formed.

Referring to fig. 8, i represents a shape in which the outer surface of the expansion shaft 1 is used for shaping the main body of the stent to be formed into a cylindrical surface, ii represents a shape in which the outer surface of the expansion shaft 1 is used for shaping the main body of the stent to be formed into an outer convex surface, and iii represents a shape in which the outer surface of the expansion shaft 1 is used for shaping the main body of the stent to be formed into an inner concave surface. The three structures can be used for processing brackets with different shapes.

It should be noted that, in order to ensure the normal operation and durability of the tooling fixture for heat setting the alloy bracket, all the components are made of high-strength metal materials, including but not limited to stainless steel and aluminum alloy; concentricity of the expansion shaft 1, the first clamp 2 and the second clamp 3 is not lower than 2 mu m; the positioning bulge 6 and the positioning groove 7 are in small clearance fit; the surface roughness (Ra) of all small clearance fit of the tool clamp is not lower than 0.1 mu m; the surface flatness of all small clearance fit of the tool clamp is not lower than 1 mu m; the perpendicularity of all the surfaces of the tool clamp which are in small clearance fit is not lower than 2 mu m; the parallelism of the surfaces of all the small clearance fit parts of the tool clamp is not lower than 2 mu m.

The application provides a tooling fixture for heat setting of an alloy bracket, which is provided with an expansion shaft 1, a first fixture 2 and a second fixture 3; the method is used for carrying out heat treatment shaping on the bracket with the specific shape. The positioning table of the expansion shaft 1 and the second groove 5 of the second clamp 3 are used for expanding the bracket to be formed and the outer part Peng Gan thereof; the first groove 4 of the second clamp 3 and the first clamp 2 are used for expanding and shaping the side wings of the bracket to be formed. The first clamp 2 is provided with a first inclined plane 201 for expanding the side wings of the bracket to be formed; the positioning bulge 6 of the expansion shaft is matched with the positioning groove 7 arranged on the first clamp 2 and the second clamp 3 for combination, and the combination of the positioning bulge 6 and the positioning groove 7 can ensure that all parts of the tool clamp cannot be combined due to position errors or the bracket which does not meet the target requirements is formed by heat setting.

The application also provides a use method of the tooling fixture for heat setting of the alloy bracket, which is applied to the tooling fixture for heat setting of the alloy bracket and comprises the following steps:

s1, inserting an expansion shaft 1 into an undeployed bracket to be formed, so that a main body part of the bracket to be formed is fully expanded and unfolded, and a side wing and an outward expansion rod are not fully expanded and unfolded; referring to fig. 9 and 13, firstly, the expansion shaft 1 is moved downwards along the axial direction, so that the tapered surface 102 at the lower end of the expansion shaft 1 is close to the undeployed bracket to be formed (i.e. the cut pipe), the expansion shaft 1 sequentially expands and deploys the outer Peng Gan, the main body part and the side wings radially towards the periphery, at this time, the main body part of the bracket to be formed is completely expanded and deployed, and the main body part does not need to be further expanded in the subsequent steps; the side flaps and outer Peng Gan have not yet fully distended and deployed and the side flaps and outer Peng Gan need to be further distended and deployed outwardly in a subsequent step.

Then the first clamp 2 and the second clamp 3 are sleeved outside the bracket to be formed together and used for shaping the outer surface of the main body part of the bracket to be formed; the upper end face of the first clamp 2 and the lower end face of the second clamp 3 are matched and shaped to form a side wing of the bracket to be formed; the components of the second clamp 3 are combined with each other and sleeved on the outer surface of the bracket to be formed, the first clamp 2 is axially sleeved on the outer surface of the bracket to be formed, the first clamp 2 and the second clamp 3 jointly form a shell structure, and the expansion shaft 1 forms an inner core structure. The specific process is as follows:

s2, folding the two split parts of the second clamp 3, and completing circumferential positioning of the second clamp 3 through matching of the positioning protrusions 6 and the positioning grooves 7; as shown in fig. 10, after the expansion shaft 1 is inserted, the main body part, the side wings and the outer Peng Gan of the stent to be formed are all unfolded by the expansion shaft 1, and the radial dimensions of the three parts are consistent. The two split bodies of the second clamp 3 are folded to form the complete second clamp 3, and the positioning groove 7 arranged on the inner wall of the second clamp 3 and the positioning protrusion 6 arranged on the outer surface of the expansion shaft 1 are mutually matched and inserted to realize circumferential matching positioning.

S3, axially moving the expansion shaft 1 to enable the first outer Peng Ganding molded surface 301 of the second clamp 3 to be in contact with the second outer Peng Gan molded surface 101 of the expansion shaft 1 to finish molding of the outer Peng Gan; and the side wings are ejected out through the positioning bulges 6, and simultaneously, the lower parts of the positioning bulges 6 are contacted with the bottom ends of the big meshes of the bracket to be formed. With reference to fig. 11, the expansion shaft 1 moves downwards, so that the first outer Peng Ganding surface 301 contacts the outer Peng Gan, the outer Peng Gan expands further towards the periphery, and the outer Peng Gan enters the second groove 5, so that the outer Peng Gan is shaped. The expansion shaft 1 moves downwards, so that the lower part of the positioning bulge 6 contacts with the flank firstly, the flank is ejected outwards, the radial size of the lower part of the flank is larger than that of the main body part of the bracket to be formed, and the positioning bulge 6 moves downwards to a proper position and contacts with the bottom end of the big mesh of the bracket to be formed.

S4, the first clamp 2 completes circumferential positioning through the matching of the positioning protrusion 6 and the positioning groove 7, and moves along the axial direction until the first inclined plane 201 of the first clamp 2 contacts with the second inclined plane 302 of the second clamp 3, and shaping of the side wings is completed. In combination with fig. 12, in the previous process, the expansion shaft 1 and the second clamp 3 are matched with each other, the main body part of the bracket to be formed and the outer Peng Gan are shaped, the first clamp 2 moves from bottom to top and is sleeved on the expansion shaft 1, the upward movement is continued, the first inclined surface 201 of the first clamp 2 contacts with the side wing, the side wing is further expanded and unfolded, when the first inclined surface 201 contacts with the second inclined surface 302, the side wing reaches a required position, and the side wing enters into the first groove 4.

In the molding process, the method further comprises the following steps:

heating the bracket to be formed to keep the bracket to be formed in a shaping state; the fixture clamp for heat setting of the alloy bracket and the bracket to be formed are heated together, so that the characteristics of the bracket to be formed are changed.

Cooling and removing the expansion shaft 1, the first clamp 2 and the second clamp 3; and after cooling, the bracket to be formed is kept in a formed state, and the final bracket is formed. The removal process may be performed in reverse order to the above-described installation process.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. Work fixture for alloy support heat setting, alloy support includes main part, flank, outer Peng Gan, big mesh, its characterized in that includes:

the expansion shaft (1) is used for being inserted into the to-be-formed bracket to realize expansion of the to-be-formed bracket;

the first clamp (2) is sleeved outside the bracket to be formed and is used for shaping the outer surface of the main body part of the bracket to be formed;

the second clamp (3) is sleeved outside the bracket to be formed;

one end of the first clamp (2) is provided with a first flank fixed surface, one end of the second clamp (3) is provided with a second flank fixed surface, the first flank fixed surface and the second flank fixed surface can be mutually butted, the first flank fixed surface and/or the second flank fixed surface are provided with a first groove (4), and the first groove (4) is used for accommodating and shaping flanks of the bracket to be molded;

one end of the second clamp (3) is provided with a first outer Peng Ganding molded surface (301), one end of the expansion shaft (1) is provided with a positioning table, and the positioning table is provided with a second outer Peng Ganding molded surface (101); the first outer Peng Ganding molded surface (301) and/or the second outer Peng Gan molded surface (101) are provided with a second groove (5), and the second groove (5) is used for accommodating and molding the outer Peng Gan of the bracket to be molded;

the side wings extend obliquely downward and protrude beyond the main body portion of the stand, and the outer wings Peng Gan extend obliquely upward and protrude beyond the main body portion of the stand.

2. The tooling fixture for heat setting of the alloy bracket according to claim 1, wherein the outer wall of the expansion shaft (1) is provided with a positioning protrusion (6) in a protruding mode, the inner wall of the first fixture (2) and the inner wall of the second fixture (3) are respectively provided with a positioning groove (7) which can be in butt joint communication, and the positioning protrusion (6) and the positioning groove (7) are matched and inserted to realize circumferential positioning.

3. Tool clamp for heat setting of alloy brackets according to claim 2, characterized in that the number of positioning protrusions (6) is equal to the number of flanks of the bracket to be formed, and the positioning protrusions (6) are used for contacting with the bottom end of the macro-mesh of the bracket to be formed.

4. The tooling fixture for heat setting of alloy brackets according to claim 2, wherein the positioning protrusions (6) are provided with guide inclined planes, and the positioning protrusions (6) eject the side wings of the bracket to be formed outwards through the guide inclined planes.

5. The tooling fixture for heat setting of alloy brackets according to claim 1, wherein the lower end of the expansion shaft (1) is provided with a tapered surface (102), and the outer diameter of the tapered surface (102) gradually decreases from top to bottom.

6. The tooling fixture for heat setting of alloy brackets according to claim 1, wherein the first fixture (2) is provided with first inclined planes (201) which are equal to the number of the side wings of the bracket to be formed, and the first side wing fixing surfaces are the first inclined planes (201); the second clamp (3) is provided with second inclined planes (302) which are equal to the number of the side wings of the bracket to be formed, and the second side wing fixing surfaces are the second inclined planes (302);

the first inclined planes (201) and the second inclined planes (302) are in one-to-one correspondence, and each group of the first inclined planes (201) and the second inclined planes (302) are used for forming the side wings of the bracket to be formed.

7. Tooling fixture for heat setting of alloy brackets according to claim 1, characterized in that the inner wall of the first fixture (2) is provided with an annular boss (202), said annular boss (202) being used to define the end position of the bracket body part to be formed.

8. Tooling fixture for heat setting of alloy brackets according to any of claims 1 to 7, characterized in that the second fixture (3) comprises at least two split bodies which can be separated in circumferential direction.

9. The tooling fixture for heat setting of alloy brackets according to claim 7, wherein the outer surface of the expansion shaft (1), the inner surface of the first fixture (2) and the inner surface of the second fixture (3) are cylindrical surfaces, prismatic surfaces, outer convex surfaces or inner concave surfaces of the parts for setting the bracket to be formed.

10. The application method of the tooling fixture for heat setting of the alloy bracket is applied to the tooling fixture for heat setting of the alloy bracket as claimed in claim 6, and is characterized by comprising the following steps:

inserting an expansion shaft (1) into the undeployed bracket to be formed, so that the main body part of the bracket to be formed is fully expanded and unfolded, and the side wings and the outward expansion rods are not fully expanded and unfolded;

the two split parts of the second clamp (3) are closed, and the circumferential positioning of the second clamp (3) is completed through the matching of the positioning bulge (6) and the positioning groove (7); the outer wall of the expansion shaft (1) is provided with the positioning protrusions (6) in a protruding mode, and the inner wall of the first clamp (2) and the inner wall of the second clamp (3) are respectively provided with the positioning grooves (7) which can be in butt joint communication;

the expansion shaft (1) moves axially to enable the first outer Peng Ganding molded surface (301) of the second clamp (3) to be in contact with the second outer Peng Gan molded surface (101) of the expansion shaft (1) so as to finish the molding of the outer Peng Gan; the side wings are ejected out through the positioning protrusions (6), and meanwhile, the lower parts of the positioning protrusions (6) are contacted with the bottom ends of the large meshes of the bracket to be formed;

the first clamp (2) completes circumferential positioning through the matching of the positioning protrusion (6) and the positioning groove (7), the first clamp (2) moves along the axial direction until a first inclined surface (201) of the first clamp (2) contacts with a second inclined surface (302) of the second clamp (3), and shaping of the side wings is completed;

the side wings extend obliquely downward and protrude beyond the main body portion of the stand, and the outer wings Peng Gan extend obliquely upward and protrude beyond the main body portion of the stand.