WO2023020596A1

WO2023020596A1 - Heat treatment die and heat treatment method

Info

Publication number: WO2023020596A1
Application number: PCT/CN2022/113442
Authority: WO
Inventors: 杨灵锋; 赵曼曼
Original assignee: 杭州启明医疗器械股份有限公司
Priority date: 2021-08-19
Filing date: 2022-08-18
Publication date: 2023-02-23
Also published as: CN118175975A

Abstract

Disclosed in the present application is a heat treatment die. The heat treatment die comprises an annular member, wherein the annular member has an axial direction in space, one or more annular members are provided, and a positioning groove is provided at the periphery and/or an inner edge of each annular member; and in a heat treatment state, the annular members are arranged in the axial direction of the annular member, and at least one part of a workpiece is embedded in the positioning groove corresponding to the workpiece in position and is restrained and shaped by the annular member.

Description

Heat treatment mold and heat treatment method

technical field

The present application relates to the technical field of molds, in particular to a heat treatment mold and a heat treatment method.

Background technique

The processing of medical interventional devices generally requires heat treatment and shaping. Most of the existing molds for heat treatment of medical devices are realized by machining, and the pins densely arranged on the surface of the mold are used to position the interventional devices. Therefore, the heat treatment mold itself needs to open a large number of pin holes during processing, and the operation in the process of disassembling and assembling the interventional device is cumbersome.

Not only that, for interventional devices with complex configurations, more precision requirements are put forward for the machining equipment of molds, and the process is cumbersome and the efficiency is low.

Contents of the invention

The application discloses a heat treatment mold, which can reduce processing difficulty requirements and improve workpiece disassembly and assembly efficiency.

A heat treatment mold of the present application includes a support body, the support body has a spatial axial direction, positioning grooves are distributed on the support body, at least a part of the workpiece in the heat treatment state is embedded in the positioning groove corresponding to the position, and is The support constrains the shape.

The following also provides several optional ways, but they are not used as additional limitations on the above-mentioned overall scheme, but are only further additions or optimizations. On the premise of no technical or logical contradiction, each optional way can be carried out independently for the above-mentioned overall scheme Combination can also be a combination of multiple options.

Optionally, at least a part of the workpiece in a heat-treated state is sheathed on the outer periphery of the support body, or surrounded inside the support body.

Optionally, the workpiece is a cylindrical structure, and the wall of the cylindrical structure is a uniform or non-uniform grid structure.

Optionally, the cylindrical structure penetrates axially, and the workpiece is deformable in the radial direction and has a relative expansion state and a compression state.

Optionally, the workpiece is a medical device. In particular, it may be a self-expanding and releasing interventional medical device.

Optionally, the workpiece is made of memory alloy material. For example cut from shape memory tubing.

Optionally, the workpiece is made of nickel-titanium alloy.

Optionally, the support body is shaped by 3D printing. Optionally, the raw material of the support includes metal powder, and the working temperature of the metal powder is at least 400 degrees Celsius.

Optionally, the support body (the area other than the positioning groove) has a smooth outer surface.

Optionally, the shape of one axial end of the support gradually converges to form a guide cone for guiding the workpiece to fit in place.

Optionally, the apex angle of the guide cone is 30°-60°.

Optionally, the support body is a cylindrical structure as a whole.

Optionally, the wall thickness of the support body is 1-2.5 mm. Preferably less than 2mm, for example 1-1.5mm.

Optionally, the side wall of the support body is provided with lightening holes corresponding to the hollow parts of the workpiece.

Optionally, the side wall of the support body is provided with through holes for installing auxiliary tools.

Optionally, a partial area of the supporting body in the axial direction has a double-layer structure, and the workpiece accommodation area is between the double layers.

Optionally, the positioning groove is provided between the two layers on the side facing the workpiece accommodating area.

Optionally, the two layers are fixed to each other by a connecting piece, and the connecting piece runs through the workpiece accommodating area, and/or bypasses and avoids the workpiece accommodating area.

Optionally, the positioning grooves are distributed in at least one of the following positions:

radially outer side of the support body;

radial inner side of the support body;

Axial end face of the support body.

Optionally, the edges of the positioning groove are rounded.

Optionally, the workpiece is a radially deformable net tubular structure, and includes a plurality of grids surrounded by frame bars, the depth of the positioning groove is L1, and the thickness of the frame bars accommodated by the positioning groove is L2, and satisfy L1>0.5*L2.

Optionally, L1=(0.6-3)*L2.

Optionally, L1=(0.8-1.5)*L2.

Optionally, the workpiece is a radially deformable mesh tube structure, and includes a plurality of grids surrounded by frame bars, and the distribution area of the positioning grooves can at least accommodate the radial turning parts of the frame bars on the workpiece .

Optionally, the workpiece is a radially deformable net tubular structure, and includes a plurality of grids surrounded by frame bars, and the distribution area of the positioning grooves can at least accommodate the upper frame bars on the peripheral surface of the workpiece the turning point.

Optionally, the workpiece is a radially deformable mesh cylinder structure, and includes a plurality of grids surrounded by frame bars, and the distribution area of the positioning grooves can at least accommodate grid nodes on the workpiece.

Optionally, the distribution area of the positioning groove can accommodate all the frame strips on the workpiece.

Optionally, the width of the positioning groove is the same as or slightly wider than the width of the frame bar at the corresponding position.

Optionally, the notch of the positioning groove has a tendency to converge.

Optionally, all the positioning grooves are connected to each other, or are distributed in multiple independent areas.

Optionally, the workpiece has a hollow grid structure, and at least a part of the positioning grooves have the same shape as one of the grid structures.

Optionally, at least a part of the positioning grooves encloses a quadrilateral area.

Optionally, the workpiece is a radially deformable mesh tube structure, and includes a plurality of grids surrounded by frame bars, and each grid is a hollow grid area;

The area where the positioning grooves are distributed on the support body is the working area. In the working area, other parts except the positioning grooves are relative positioning protrusions, and the edge parts of the positioning protrusions are used as the positioning grooves. tank wall;

In the working state, the positioning protrusions are placed into the corresponding grid area, and the frame bars and the grid nodes at the intersection of the frame bars are placed into the corresponding positioning grooves.

Optionally, the corresponding positioning protrusions in the same grid area of the workpiece are integrated or arranged in multiple places at intervals, wherein the interval arrangement is arranged at intervals along the axial direction of the support body, and/or arranged at intervals along the circumferential direction of the support body.

Optionally, along the circumferential direction of the support body, the two opposite sides of the positioning protrusion are positioning sides, and along the radial view of the support body, the positioning sides provide at least two constraint points that can act on the workpiece .

Optionally, along the circumferential direction of the support body, two opposite sides of the positioning protrusion are positioning sides that interact with the workpiece, and the positioning sides are arc-shaped structures.

Optionally, the positioning protrusion is circular or elliptical in view of the radial direction of the support body.

Optionally, along the supporting axis, there is a gap between two opposite ends of the positioning protrusion and the workpiece.

Optionally, there is a recessed avoidance area in the area corresponding to the position of the workpiece on the support body. When the workpiece and the support body are in a mated state, a preset diameter is left between the workpiece and the avoidance area. to the gap.

Optionally, the avoidance area is formed by further recessing the bottom of the positioning groove.

Optionally, the area where the positioning grooves are distributed on the support body is the working area, and the avoidance area is formed by a local depression in the working area.

Optionally, the workpiece is a radially deformable mesh cylinder structure, and includes a plurality of grids surrounded by frame bars, and the avoidance area corresponds to the grid nodes on the workpiece.

Optionally, the heat treatment mold further includes a binding member for binding the workpiece to the support body.

Optionally, the binding member is a winding and bending binding wire, or a rigid ring.

Optionally, the outer periphery of the support body is provided with a slot for positioning the binding piece.

Optionally, the slots are one or more arranged at intervals along the axial direction of the support body.

Optionally, the area where the positioning grooves are distributed on the support body is the working area, and the working area has one or more radial turning positions, and the positions of the locking grooves correspond to the radial turning positions.

Optionally, the slots are located at both axial ends of the working area.

Optionally, the locking groove is spirally wound around the outer periphery of the support body.

Optionally, the card slot circles the support body at least twice.

Optionally, a chute is provided on the support body, and the heat treatment mold further includes an adjustment piece movably fitted in the chute, and the adjustment piece is used to abut against a corresponding part of the workpiece.

Optionally, the workpiece has a hollow grid structure, and the position of the chute in the circumferential direction of the support corresponds to the position of the apex of the grid structure.

Optionally, the chute extends axially along the support body.

Optionally, the supporting body is provided with marks indicating the relative positions of the adjusting parts.

Optionally, a plurality of sliding grooves are distributed along the circumference of the supporting body, and the adjusting member is rod-shaped, one end of which extends into the corresponding sliding groove, and the other end extends toward the central area inside the supporting body.

Optionally, one end of each adjustment member extending to the inside of the support body is independent of each other or converging with other adjustment members.

Optionally, all the adjustment parts meet at a connecting ring inside the support body.

Optionally, the heat treatment mold further includes a pulling member acting on the adjusting member to drive the adjusting member to move along the chute.

Optionally, the support body is provided with a guide hole through which the pulling member passes.

Optionally, the pulling member is directly connected to the adjusting member, or connected to the connecting ring.

Optionally, the adjusting member is provided with a radial limiting portion, and the radial limiting portion abuts against the support body.

Optionally, along the axial direction of the support body, one end of each sliding groove is an open structure for the adjustment member to be disassembled.

Optionally, the support body has opposite top sides and bottom sides in the axial direction, and the chute includes:

a first chute, one end of the first chute is open towards the top side of the support body;

A second sliding slot, one end of the second sliding slot is open toward the bottom side of the support body.

Optionally, along the circumferential direction of the support body, the first sliding grooves and the second sliding grooves are alternately arranged.

Optionally, the support body is an integral structure in the axial direction or a split structure including a plurality of unit segments.

Optionally, among the plurality of unit segments, only some of the unit segments are provided with the positioning groove, or all the unit segments are provided with the positioning groove.

Optionally, two adjacent unit segments are spliced at the radial turning point of the support body.

Optionally, the axial distance between two adjacent unit segments is adjustable.

Optionally, two adjacent unit segments are rotationally fitted around the axis of the support body.

Optionally, two adjacent unit segments are movably plugged and fitted along the axial direction of the support body.

Optionally, matching pins and sockets are provided on opposite axial end faces between two adjacent unit segments.

Optionally, the intersection of two adjacent unit segments is located at a radial turning point of the support body.

Optionally, one of the unit segments is a guide cone.

Optionally, the support body includes one or more ring members, the outer circumference and/or inner edge of each ring member is provided with the positioning groove, and in the heat treatment state, each ring member is arranged in sequence along the axial direction of the support body.

Under the condition that the ring does not limit its own processing technology, it can also be understood that the application provides a heat treatment mold, including one or more rings for supporting the workpiece, and the outer circumference and/or inner edge of each ring is provided with positioning groove, at least a part of the workpiece is embedded in the positioning groove corresponding to the position, and is constrained and shaped by each ring piece.

Optionally, along the radial direction of the ring member, the notch of the positioning groove has a tendency to converge.

Optionally, one end of the positioning groove in the axial direction of the ring member is an open port, or both ends are open ports, wherein at least one port is in the form of a flared opening.

Optionally, along the axial direction of the ring member, a positioning boss is provided in the middle of the port.

Optionally, the positioning groove extends with equal width and the extending path is a straight line or a curve, and the straight line is parallel to the axis of the ring or forms an included angle α.

Optionally, there are multiple ring members, and adjacent ring members are stacked or arranged at intervals along the axial direction of the ring members.

Optionally, the workpiece is a radially deformable mesh cylinder structure, and includes a plurality of grids surrounded by frame bars, and the central area of the positioning groove on the ring member corresponds to the grid nodes on the workpiece.

Optionally, along the axial direction of the support body, the ring member has a width of 3-20 mm.

Optionally, along the axial direction of the support body, the width of the annular member is less than or equal to the size of one grid at the corresponding position of the workpiece.

Optionally, along the axial direction of the ring member, the end surface of the ring member is a plane.

Optionally, a positioning mechanism is provided between adjacent ring members along the axial direction of the ring members to limit the relative rotation of the two.

Optionally, the area where the positioning grooves are distributed on the ring member is the working area, and along the axial direction of the ring member, the working area on the same ring member is arranged as one section or multiple sections at intervals, and the working areas of the multiple sections are radially recessed.

Optionally, along the axial direction of the rings, adjacent rings are independently arranged at intervals or fixed to each other by connecting pieces.

Optionally, all rings include at least one of the following types:

Inner ring, the positioning grooves are distributed on the outer circumference of the inner ring, at least a part of the workpiece in the heat treatment state is sleeved on the outer circumference of the inner ring;

In the outer ring, the positioning grooves are distributed on the inner edge of the outer ring, and at least a part of the workpiece in a heat treatment state is located on the inner periphery of the outer ring.

Optionally, the heat treatment mold further includes a core rod on which all the rings are fixed or movable.

Optionally, the core rod is a hollow or solid structure.

Optionally, the ring member is slidably sleeved on the core rod, and a guiding structure cooperating with each other is provided between the ring member and the core rod.

Optionally, the guide structure includes:

a guide groove disposed on one of the core rod or the ring;

The guide strip is arranged on the other one of the core rod or the ring, and cooperates with the guide groove.

Optionally, there are multiple guide grooves distributed on the outer periphery of the core rod, and each guide groove extends axially along the ring member.

Optionally, an axial positioning structure that cooperates with each other is provided between the ring member and the core rod.

Optionally, marks indicating the relative positions of the rings are provided on the core rod.

The application also discloses a heat treatment method for a workpiece, including a heat treatment mold and a workpiece, the heat treatment mold includes a support body, the support body has an axial direction in space, and positioning grooves are distributed on the support body; the workpiece is A tubular structure having a first shape before heat treatment and a second shape after heat treatment;

The workpiece heat treatment method includes embedding at least a part of the workpiece having a first shape into a positioning groove corresponding to the position, so that the workpiece is constrained to be shaped by the support body;

performing heat treatment on the workpiece and the heat treatment mold to obtain a workpiece having a second shape.

Optionally, the workpiece is a deformable tubular structure, and at least a section of the axial region of the workpiece is embedded in the positioning groove after being enlarged in diameter, and is constrained in a state after the diameter is enlarged.

Optionally, after at least a part of the workpiece is embedded in the positioning groove, at least a part of the opening of the positioning groove is closed to restrict the workpiece in the positioning groove.

Optionally, the workpiece is in the shape of a mesh cylinder and includes multiple sections of regions to be shaped in the axial direction, and the heat treatment method for the workpiece includes:

Provide heat treatment mold with positioning groove;

Embed each area of the workpiece to be shaped into the positioning groove of the heat treatment mold one by one;

The workpiece is heat treated together with the heat treatment mold.

Optionally, the order of embedding each area to be shaped into the positioning groove is as follows:

Consistent with the arrangement sequence of the area to be shaped along the axis of the workpiece; or

Along the axial direction of the workpiece, the order of embedding each area to be shaped into the positioning groove is that the area to be shaped in the middle is first embedded in the area to be shaped, and then inserted to both ends successively; or

Along the axial direction of the workpiece, the sequence of embedding the regions to be shaped into the positioning grooves is that the regions to be shaped at both ends are first embedded, and then the regions to be shaped in the middle are embedded.

One or more ring parts are used to separate the heat treatment mold, which is more convenient for processing. For interventional devices with different shapes and characteristics, it can realize the generalization and standardization of mold parts to a certain extent; disassembly and assembly between interventional devices and ring parts It is more convenient and reduces the negative impact caused by accumulated errors.

Optionally, the heat treatment mold is a cylindrical structure, and the support body is a plurality of movable joints along the circumferential direction of the cylindrical structure. The support body is provided with positioning protrusions, and the positioning grooves are used between the positioning protrusions. .

In the case that the heat treatment mold does not limit its own processing technology, it can also be understood that the application provides a heat treatment mold, the heat treatment mold is a cylindrical structure, and the cylindrical structure includes a plurality of movable spliced supports along its circumference , the support body is provided with positioning protrusions, and the positioning protrusions are used to limit and shape the workpiece.

Optionally, the cylindrical structure is a single-layer structure in the radial direction, and the positioning protrusions are arranged on the outer wall of the support.

Optionally, the cylindrical structure is a double-layer structure in the radial direction, including an inner layer and an outer layer, wherein the positioning protrusions are arranged on the outer wall of the inner layer and the inner wall of the outer layer.

Optionally, the heat treatment mold has first and second end faces opposite to each other in the axial direction, each support body is aligned with each other at the first end face, and the length is staggered at the second end face; or each support body is at the first end face and The second end surfaces are all aligned with each other.

Optionally, in the radial direction of the cylindrical structure, each support body has the same thickness or different thicknesses.

Optionally, in the radial direction of the cylindrical structure, the thicknesses of the supports are different, and the thicker one protrudes toward the inner side of the cylindrical structure in the radial direction.

Optionally, the cross-sectional outer profile of the cylindrical structure is circular or elliptical.

Optionally, along the circumferential direction of the cylindrical structure, two adjacent support bodies are fitted against each other through plane or arc surfaces.

Optionally, along the circumferential direction of the cylindrical structure, a guiding structure cooperating with each other is provided between two adjacent supporting bodies to guide the two to slide relative to each other.

Optionally, the guide structure is a guide groove cooperating with each other and a guide bar slidingly embedded in the guide groove.

Optionally, along the circumferential direction of the cylindrical structure, the mating surfaces between two adjacent supports are generally arranged parallel to or inclined to the axial direction of the cylindrical structure.

Optionally, along the circumferential direction of the cylindrical structure, interfitting positioning structures are provided between two adjacent supports.

Optionally, the support body has a working state surrounding the cylindrical structure, a first state further gathering inward relative to the working state, and a second state further moving away from the working state.

Optionally, the support body is plate-shaped, and the thickness direction is consistent with the radial direction of the cylindrical structure, and the outer side of the support body is an arc-shaped structure.

Optionally, along the radial direction of the cylindrical structure, the support body has a thickness of 2-10 mm.

Optionally, along the axial direction of the cylindrical structure, one end of the support body is provided with a coupling portion that cooperates with an external tool.

Optionally, along the axial direction of the cylindrical structure, both ends of the support body are rounded.

Optionally, each support body has the same structure.

Optionally, in the cylindrical structure, the number of supports is 4-24, preferably 6-16, for example 8-12, preferably an even number.

Optionally, the outer wall of the cylindrical structure has a smooth surface except for the positioning protrusion.

Optionally, the positioning protrusions are generally arranged in an array.

Optionally, on the same support body, the number of rows of positioning protrusions is 1-16, and the number of columns is 1-6.

Optionally, all the supporting bodies include a first supporting body with the positioning protrusions, and a second supporting body without the positioning protrusions.

Optionally, the first supports and the second supports are arranged alternately.

Optionally, the length and/or thickness and/or circumferential span of the first support body and the second support body are different.

Optionally, the cylindrical structure has an inner peripheral surface and/or an outer peripheral surface for the workpiece to be placed in place, and the inner peripheral surface and/or the outer peripheral surface serve as a working surface, and the positioning protrusions are sparsely distributed on the working surface.

Optionally, along the axial direction of the net cylinder structure, the working surface is divided into a plurality of areas, and each area extends along the circumference of the net cylinder structure in a belt shape, wherein the area where the positioning protrusion is located is the working area S1, and the positioning protrusion Between them is the gap area S2 as the positioning groove, and the area ratio of S1 and S2 is 2:1.

Optionally, the workpiece has a grid structure and can be sleeved on the heat treatment mold, and the distribution positions of the positioning protrusions correspond to the corresponding grids.

Optionally, the positioning protrusions are arranged in pairs, and the same pair of positioning protrusions corresponds to two opposite sides in a grid.

Optionally, the positioning protrusion has a root connected to the supporting body and an opposite head, and the head is a smooth structure.

Optionally, the same pair of positioning protrusions are arranged along the circumferential direction of the cylindrical structure.

Optionally, along the circumferential direction of the cylindrical structure, one side of the positioning protrusion is the positioning side that first abuts against the workpiece, and the positioning side is an arc surface structure.

Optionally, in a pair of positioning protrusions, the positioning sides are opposite or opposite to each other.

Optionally, the position of the positioning protrusion relative to the support body is adjustable.

Optionally, the adjustable position includes at least being adjustable along the circumference and/or axial direction of the cylindrical structure.

Regarding the way of splicing the supporting bodies in the circumferential direction, this application also discloses a mold device, including any heat treatment mold and base related to the above;

There are a plurality of mounting positions arranged around the base, and each support body in the heat treatment mold is placed in a corresponding mounting position, and the circumferential position of each support body is limited by the mounting position.

Optionally, the base includes:

a central column having opposing top and bottom ends;

A plurality of guide rails are distributed radially at the bottom end of the central column, and each support body is slidably installed on the corresponding guide rails;

The ejecting piece abuts between the central column and each supporting body along the radial direction of the central column.

Optionally, the end of each guide rail away from the central column is provided with an anti-off head that limits the extreme position of the support body, and the anti-off head is detachably connected to the guide rail.

Optionally, the support body is provided with guide grooves that cooperate with the guide rails, and the guide grooves embrace two opposite sides of the guide rails.

Optionally, the section of the guide groove is T-shaped or cross-shaped.

Optionally, a plurality of guide rails intersect with each other and form a chassis at the intersection, the top surface of the chassis has an installation slot, and the bottom end of the central column is inserted into the installation slot.

Optionally, the pushing member is an elastic member.

Optionally, the mold device includes a tube expander arranged on the central column, and the ejector is a push block on the tube expander.

The central column is a hollow or solid structure, and the outer periphery is provided with combining holes for accommodating each ejector.

Optionally, the base is columnar, each support body is arranged along the circumference of the base, and a circumferential limiting structure that cooperates with each other is provided between each support body and the outer wall of the base.

Optionally, the circumferential limiting structure includes:

A plurality of flanges are fixed at intervals on the outer periphery of the base, and the same flange extends axially along the base;

Limiting slots are opened on the inner side of each supporting body, and engage with corresponding flanges.

Optionally, the mold device further includes an annular binding member, which is placed around the periphery of all supports, and exerts a binding force on each support body against the base.

Optionally, at least one section of the binding member is an elastic structure, and an outer side of each supporting body is provided with a winding groove for accommodating the binding member.

The present application also discloses a heat treatment method using any of the above-mentioned mold devices, the support body has a working state surrounding the cylindrical structure, and a first state that is further gathered inward relative to the working state, The workpiece to be processed has a grid structure, the method comprising:

fitting the workpiece on each support in the first state;

Drive the support body into the working state, and keep the grid on the workpiece aligned with the corresponding positioning protrusion;

The heat treatment mold is heat treated together with the workpiece.

Specific beneficial technical effects will be further explained in specific embodiments in conjunction with specific structures or steps.

Description of drawings

Fig. 1 is the structure view that the heat treatment mold of an embodiment of the present application is loaded with workpiece;

Figure 2 is an enlarged view of part A in Figure 1 when the workpiece is not installed;

Fig. 3 is the exploded view of Fig. 1;

Fig. 4 is the structure view that the heat treatment mold of another embodiment of the present application is loaded with workpiece;

Fig. 5 is the structure view of workpiece among Fig. 3;

Fig. 6 is the schematic structural view of the workpiece loaded by the heat treatment mold of the present application;

7 is a structural view of a heat treatment mold loaded with workpieces according to another embodiment of the present application;

Figure 8 is an exploded view of Figure 7;

Fig. 9 is a structural view of a heat treatment mold loaded with workpieces according to another embodiment of the present application;

Fig. 10 is an enlarged view of part B in Fig. 9;

Figure 11 is an exploded view of Figure 10;

Figure 12 is an enlarged view of part C in Figure 11; Figure 13 is a structural view of Figure 12 after loading the workpiece;

Fig. 14 is a structural view of a heat treatment mold loaded with workpieces according to another embodiment of the present application;

Figure 15 is an exploded view of Figure 14;

Figure 16 is a top view of Figure 14;

Fig. 17 is a structural view from another angle of view of Fig. 16;

Fig. 18 is a structural view of a heat treatment mold loaded with workpieces according to another embodiment of the present application;

Figure 19 is an exploded view of Figure 18;

FIG. 20 is a further exploded view of the support in FIG. 19 .

Fig. 21 is a structural view of a heat treatment mold loaded with workpieces according to an embodiment of the present application;

Fig. 22 is a structural view of a heat treatment mold loaded with workpieces according to another embodiment of the present application;

Fig. 23 is a schematic diagram showing that the inner ring in Fig. 21 is provided with multiple working areas;

Figure 24 is a structural view of the workpiece in Figure 22;

Fig. 25 is a schematic diagram of a workpiece in an embodiment of the present application;

Figure 26 is a structural view of the inner ring in Figure 21;

Figure 27 is an enlarged view of part A in Figure 21 when no workpiece is loaded;

Figure 28 is a structural view of loading workpieces in Figure 27;

Fig. 29 is a partial front view of a heat treatment mold according to another embodiment of the present application;

Figure 30 is a structural view of a heat treatment mold according to another embodiment of the present application;

Figure 31 is an exploded view of Figure 30;

Figure 32 is a further exploded view of Figure 31;

Figure 33a is a structural view of the outer ring in Figure 32;

Fig. 33b is a schematic structural view of a support body in a top view according to an embodiment of the present application;

Figure 34 is a top view of Figure 30;

Fig. 35 is a sectional view of B-B part in Fig. 34;

Fig. 36 is a schematic structural view of a heat treatment mold according to another embodiment of the present application;

Figure 37 is a schematic diagram of the assembly of the outer ring in Figure 36;

Fig. 38 is a structural view loaded with binding parts in Fig. 28;

Fig. 39 is a schematic structural view of a heat treatment mold according to another embodiment of the present application;

Fig. 40 is a front view of Fig. 30 .

Fig. 41 is a perspective view of a mold loaded workpiece according to another embodiment of the present application;

Figure 42 is an exploded view of Figure 41;

Figure 43 is a top view of the workpiece loaded on the outside of the mold in Figure 41;

Figure 44 is a top view of the workpiece loaded on the inside of the mould;

45 is a schematic diagram of a mold with a double-layer structure loaded with workpieces according to an embodiment of the present application;

Fig. 46 is a schematic diagram of axial splicing of supports in a mold according to an embodiment of the present application;

Fig. 47 is a schematic diagram of each support body in a working state in a mold according to an embodiment of the present application;

Fig. 48 is a schematic diagram of each support body in a first state in a mold according to an embodiment of the present application;

Fig. 49 is a schematic diagram of each supporting body in a second state in a mold according to an embodiment of the present application;

Fig. 50 is a perspective view of a mold including a first support body and a second support body according to an embodiment of the present application;

Fig. 51 is a schematic diagram of the proportion of positioning protrusions in a mold according to an embodiment of the present application;

Figure 52 is an enlarged view of part A in Figure 41;

Fig. 53 is a perspective view of a support body in a mold according to an embodiment of the present application;

Fig. 54 is a schematic flow chart of a heat treatment method according to an embodiment of the present application;

Fig. 55 is a perspective view of a mold device loaded with workpieces according to an embodiment of the present application;

Figure 56 is an exploded view of a mold device according to an embodiment of the present application;

Figure 57 is a top view of the mold assembly of Figure 55;

Fig. 58 is a perspective view of each support body in Fig. 55 sliding close to the central column;

Figure 59 is a top view of the mold assembly of Figure 58;

Fig. 60 is a schematic diagram of the assembly of the anti-off head of the mold device according to an embodiment of the present application;

Fig. 61 is a schematic diagram of another viewing angle of Fig. 60;

Figure 62 is an exploded view of the central column and guide rail of Figure 56;

Fig. 63 is a perspective view of a mold device loaded with workpieces according to another embodiment of the present application;

Figure 64 is an assembly view of a support body in Figure 63;

Figure 65 is a top view of the mold assembly of Figure 63;

Figure 66 is an exploded view of each support body and base in Figure 63;

Figure 67 is a top view of Figure 66;

Figure 68 is a perspective view of the support in Figure 63;

Figure 69 is a perspective view from another angle of view of Figure 68;

Figure 70 is a perspective view of the base in Figure 63;

Fig. 71 is a structural schematic diagram of a mold loaded workpiece according to another embodiment of the present application;

Fig. 72 is the front view of the mold loaded workpiece in Fig. 71;

Figure 73 is a partial exploded view in Figure 71;

Figure 74 is an exploded view between the workpiece and the mold in Figure 71;

Figure 75 is a front view of the separation of the workpiece and the mold in Figure 74;

Figure 76 is an enlarged view of part D in Figure 72;

Fig. 77 is a structural schematic diagram of one of the positioning protrusions cooperating with the workpiece in the mold according to an embodiment of the present application;

FIG. 78 is a structural schematic diagram of a positioning protrusion cooperating with a workpiece in another embodiment of the present application.

Identified in the figure as:

100, support body; 101, inner side; 102, outer side; 103, axis; 104, inner layer; 105, guide cone; 106, outer layer; 107, through hole; 108a, top side; 109a, bottom side; 108b, Top side; 109b, bottom side; 110, positioning groove; 111, notch; 112, port; 120, work area; 121, transition area; 130, avoidance area; 131, hollowed out part; Groove; 143, metal ring; 142, radial turning point; 150, chute; 151, adjustment piece; 151a, adjustment piece; 151b, adjustment piece; 152, identification; 153, connecting ring; 153a, adjustment piece; Adjusting piece; 154, pulling piece; 155, guide hole; 156, radial limit part; 157, first chute; 158, second chute; 160, unit segment; 160a, externally embedded unit segment; 160b, Embedded unit segment; 161, latch; 162, jack; 170, ring piece; 171, connector; 172, core rod; 173, inner ring; 173a, first inner ring; 173b, second inner ring; 173c, The third inner ring; 174, the outer ring; 175, the guide groove; 176, the guide bar; 178, the positioning boss; 179, the ring body. 180, workpiece accommodation area; 181, inner layer; 182, outer layer;

201, first end surface; 202, second end surface; 201a, first end surface; 202a, second end surface; 201b, first end surface; 202b, second end surface; 203, working surface; 204, first support body; 205, 210, positioning protrusion; 210a, positioning protrusion; 210b, positioning protrusion; 211, positioning side; 212, root; 213, head; 220, supporting surface; 230, guide groove; 240, around slot;

400, base; 410, center column; 411, top; 412, bottom; 413, combination hole; 420, guide rail; 421, anti-off head; 422, chassis; 425, the second side; 430, the push piece; 441, the flange; 442, the limit groove; 450, the binding piece; 460, the installation position;

900, workpiece; 901, frame bar; 902, grid; 903, hollowed out part; 904, connecting part; 921, radial turning part; 922, turning part on the peripheral surface; 923, apex part; 923a, V-shaped end ; 923b, X-shaped node; 923c, apex; 923d, apex; 924, area to be finalized; 925, grid node; 926, grid area; 927, gap; 928a, constraint point; 928b, constraint point;

S1, working area; S2, void area.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some, not all, embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

It should be noted that when a component is said to be "connected" to another component, it may be directly connected to the other component or intervening components may also exist. When a component is said to be "set on" another component, it may be set directly on the other component or there may be an intervening component at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the description of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An embodiment of the present application discloses a heat treatment mold, including a support body 100, the support body 100 has a spatial axial direction, positioning grooves 110 are distributed on the support body 100, and at least a part of the workpiece 900 in the heat treatment state is embedded in a corresponding position. The positioning groove 110 is constrained to shape by the support body 100 .

The workpiece 900 has a certain deformability, and after it is installed on the support body 100 in a curved manner, it is heat-treated as a whole to achieve the final shape of the workpiece.

Referring to FIGS. 1-6 , in one embodiment, the workpiece 900 is a self-expanding interventional device. Such devices can be stents in the cardiovascular system and atrioventricular valve stents. The common form can be an axially penetrating mesh tubular structure. The wall of the tubular structure is a uniform or non-uniform grid structure. The uniform grid structure It can be understood that the geometric configuration of each cell is the same or similar. The material of the workpiece 900 can be a memory metal, for example, the workpiece 900 is made of nickel-titanium alloy. Of course, the workpiece 900 is not limited to self-expandable interventional instruments, and may also be other tubular-shaped workpieces.

The positioning grooves 110 extend axially and/or radially on the support body 100 and have a shape. The positioning grooves 110 may be continuous or interrupted. Part of the workpiece 900 can be embedded in the positioning groove 110 , so that part of it is constrained by the support body 100 , and other parts are naturally transitioned; The constraining force may be an active force generated by the mutual engagement of the positioning groove 110 and the workpiece 900 . Mainly restricting the axial and/or radial movement of the workpiece 900 can also be understood as the workpiece 900 changes along the path defined by the positioning groove 110 .

Since interventional devices are generally in the shape of a mesh tube with thinner frames, there are many curves and curved surfaces in space, and a specific spatial configuration must always be maintained during the heat treatment process, so the use of traditional metal processing methods to prepare heat treatment molds is not only important The precision requirements are very high, and the machining process is very complicated. To meet the heat treatment requirements of self-expanding interventional devices, the support body 100 can be formed by 3D printing.

In order to meet the heat treatment environment, the working temperature of the support body 100 is at least 400 degrees Celsius, so materials that can withstand this temperature can be selected, such as metal powder or ceramic powder. The 3D printing processing method can realize the structure that is difficult to realize by machining. It can not only replace the traditional pin fixing, but also accurately process the positioning groove matching the shape of the interventional device, which greatly reduces the production cost of the heat treatment mold and shortens the the processing cycle.

The shape of the workpiece before heat treatment is generally different from the size of the mold. Therefore, after assembly, due to the deformation of the workpiece, there is a large stress inside and between the support. In traditional machining molds, although it can also be configured similar to positioning grooves The limit structure is used to directly restrain the workpiece, but generally considering the difficulty of processing, it is a straight groove, which reduces the use of curves and curved surfaces as much as possible, but this also leads to the increase of the stress mentioned above, and the use of 3D printing can get rid of it. The processing constraint of the shape of the positioning groove adopts more curve transitions, which can reduce stress, avoid structural damage during the process of loading the workpiece into the heat-setting mold, improve the compliance of the structure, and also help the workpiece to enter the delivery system before interventional surgery. compressed load.

Especially on the edge of the positioning groove, the 3D printing method can be used to process the edge of the positioning groove into a rounded structure, which also matches the shape of the output material of the print head during 3D printing. If it is sharp edges and corners, it will be more difficult The edge of the positioning groove can be understood as the part where the workpiece is in contact with the wall of the positioning groove during and after loading. The rounded corner structure is conducive to entering or moving out of the positioning groove during the disassembly and assembly of the workpiece. After the workpiece is in place , The fillet can release local stress and reduce workpiece damage.

Unless otherwise specified, the supports in each embodiment of the present application can be formed by 3D printing to obtain corresponding effects. Of course, in some embodiments, for the specific structure of the heat-setting mold, also Further improved schemes are proposed, and in these improved schemes, the molding by 3D printing is not strictly limited.

The specific arrangement of the positioning groove 110 on the support body 110 is as follows:

The positioning slots 110 are distributed in at least one of the following positions:

The radially outer side 102 of the support body;

The radially inner side 101 of the support body;

Axial end face of the support body.

Wherein, the supporting body 100 has an axis 103 and also has a radial direction. The inner side 101 refers to the side close to the axis, and the outer side 102 refers to the side away from the axis.

The outer and inner sides in the radial direction correspond to the outer surface and the inner surface of the support body 100 , respectively. The corresponding positioning slot 110 has an opening facing the corresponding direction, for example, if it is opened on the outside, it has an opening facing the outside. Combined with the distribution of the positioning grooves 100 , at least a part of the workpiece 900 in a heat-treated state is sheathed on the outer periphery of the support body 100 or surrounded inside the support body 100 . Then the corresponding supporting body 100 is radially closed, and the preferred workpiece is installed outside the supporting body, which is convenient for installation.

In one embodiment, the supporting body 100 (the area other than the positioning groove) has a smooth outer surface. The smooth outer surface can be obtained by finishing or electrochemical treatment, such as grinding, etc., and the smooth outer surface facilitates the nesting of the bracket workpiece 900 . Of course, if the workpiece 900 is installed on the inner side and/or the end surface, the inner surface and/or the end surface of the support body 100 are also smoothed.

Referring to FIG. 3 , in order to further improve loading and unloading efficiency, the shape of one end of the support body in the axial direction gradually converges to form a guide cone 105 for guiding the workpiece 900 to fit in place.

The converging end of the guide cone 105 can be pointed or flat, correspondingly having an apex angle. The radial dimension corresponding to the end of the guide cone should be smaller than the radial dimension of the first loaded end of the workpiece 900 . Wherein, the apex angle of the guide cone 105 is 30°-60°, and the preferred apex angle is 45°.

In one embodiment, the support body 100 is a through structure along its axial direction. Manufacturing materials are saved, and compared with 3D printing, the manufacturing cycle is further shortened. Wherein, the supporting body 100 is cylindrical as a whole, and its outer peripheral surface or generatrix shape is adapted to the workpiece. Preferably, the supporting body 100 is a rotating body as a whole, and the generatrix of the rotating body is a straight line or a curve.

The penetrating structure in the axial direction is also conducive to heat conduction during heat treatment to obtain an ideal temperature distribution. The penetrating structure can also be used to support or mount the mold itself.

In the prior art, the strength of the workpiece after heat treatment is often not as expected. The applicant found that this is related to the temperature change of the heat treatment mold and the workpiece. Because the traditional machining method needs to clamp, drill, cut or mill the mold blank and other operations, so the structural strength requirements are higher, and the support body must also have sufficient wall thickness, for example, generally about 10cm. However, this application uses 3D printing to further reduce the wall thickness requirements. Using 3D printing can make the wall thickness of each part roughly the same, or reduce the thickness of the parts where the structural strength is not high as required. From another perspective, using 3D printing The post-heat setting mold has irregular internal stress distribution, and the deformation after molding is small, allowing a thinner wall thickness.

Referring to Fig. 33b, when the inner wall of the support body does not have a groove (cooperating structure), the wall thickness t of the support body is 1-2.5mm, for example, 1-1.5mm. In order for the support body to cooperate with other tooling, or to install the structural parts contained in the support body itself, the part of the support body is also allowed to be thickened so as to have enough processing or connection space.

After the wall thickness is reduced, it is conducive to the rapid temperature rise of the support during the processing process, and the expected temperature can be reached in a short period of time, which can improve the metal crystal structure inside the workpiece and relatively improve the performance of the workpiece.

Referring to FIGS. 9 to 11 , in an embodiment, the side wall of the supporting body 100 is provided with corresponding weight-reducing holes of the hollowed out part 903 of the workpiece 900 . The corresponding weight-reducing hole can be circular or other non-circular. Preferably, the weight-reducing hole should be completely inside the hollow part 903 , for example, the weight-reducing hole is circular, which is convenient for processing.

Meanwhile, in order to constrain the workpiece 900 effectively, in one embodiment, a through hole 107 for installing an auxiliary tool is opened on the side wall of the support body 100 .

The number of through holes 107 is multiple, and the radial size is multiple, which is specifically determined according to the specific position of the restraining workpiece 900 . The positions of the through-holes 107 are distributed as endpoints adjacent to the hollowed out parts or connection points between adjacent hollowed out parts 903 , and the endpoints and connection points are collectively referred to as nodes. The auxiliary tool cooperates with the through hole 107 to limit the separation of the workpiece 900 and the support body 100 . The auxiliary tool may be a pin or a cable, for example, the cable passes through the through hole 107 to bind and fix the workpiece 900 .

Another embodiment of the present application discloses a heat treatment mold, including a support body, the support body has an axial direction in space, positioning grooves are distributed on the support body, at least a part of the workpiece in the heat treatment state is embedded in the corresponding positioning groove, and The shape is constrained by the support body, and the partial area in the axial direction of the support body is a double-layer structure, and the workpiece accommodation area is between the double layers.

Wherein, a positioning groove is provided between the double layers on the side facing the workpiece accommodating area. Either one of the layers may have positioning grooves, or both layers may have positioning grooves.

4, the top side 108a of the workpiece 900 is a single-layer cylindrical structure, and the bottom side 109a of the workpiece 900 is rolled radially outward to form a double-layer cylindrical structure. In order to adapt to the specificity of this type of workpiece, take the orientation in the figure as an example, support The bottom of the body 100 has a double-layer structure, including an inner layer 181 and an outer layer 182 , and positioning grooves 110 are respectively provided on the outer periphery of the inner layer 181 and the inner edge of the outer layer 182 . After the bottom side 109 of the workpiece 900 is placed in the workpiece accommodating area 180 , it can be positioned in the corresponding positioning groove 110 by means of a binding piece or the like.

The inner layer 181 and the outer layer 182 are detachably connected to each other or have an integral structure. When the detachable connection is adopted, the two layers are fixed to each other by the connecting piece, and the connecting piece runs through the workpiece accommodation area, and/or bypasses (that is, avoids) the workpiece accommodation area, for example, the inner layer and the outer layer can be prefabricated into a cylindrical shape respectively , and then nest and fix each other. The different shapes of the workpiece 900 affect the change of the path of the positioning groove 110 to a certain extent, which will be described below in conjunction with the above-mentioned tubular structure.

In one embodiment, the workpiece 900 is a radially deformable net tubular structure, and includes a plurality of grids 902 surrounded by frame bars 901, the depth of the positioning groove 110 is L1, and the frame bars accommodated in the positioning groove 110 The thickness is L2 and satisfies L1>0.5*L2. The specific ratio is, for example, L1=(0.6-3)*L2. Another example is L1=(0.8-1.5)*L2.

Referring to Figure 5 and Figure 6, the distribution of positioning grooves is not required to accommodate all parts of the workpiece. According to the key parts of shaping, the following parts of the corresponding workpiece can be preferably selected:

(1) The distribution area of the positioning groove 110 can at least accommodate the grid nodes (vertex 923 ) of the grid 902 on the workpiece 900 , including both the V-shaped end point 923a and the X-shaped node 923b at the intersection of multiple cells.

(2) The distribution area of the positioning groove 110 can at least accommodate the radial turning portion 921 of the frame bar on the workpiece 900 . The radial turning point can be understood as the area where the diameter of the workpiece changes significantly. Simplifying the workpiece 900 as a rotating body, the radial turning part 921 can be understood as the turning part of the generatrix, and combined with the specific shape of the workpiece 900, the radial turning part 921 can be understood as the waist with the smallest diameter.

(3) The distribution area of the positioning groove 110 can accommodate at least the turning point 922 of the frame bar 901 on the workpiece 900 on the peripheral surface of the workpiece. The frame bar between two adjacent nodes generally has no obvious distortion. When there is obvious distortion at the grid node, the frame bar can be understood as a turning point on the peripheral surface.

As a more preferable solution, the distribution area of the positioning groove 110 can accommodate all the frame strips 901 on the workpiece 900 . This enables the workpiece 900 to be pre-shaped according to the artificially set positioning groove.

Wherein, the width of the positioning groove 110 is consistent with the width of the frame bar at the corresponding part or slightly wider than the frame bar 901 . It facilitates the loading and unloading of the workpiece 900 and provides a certain limit effect in the circumferential direction. At the same time, in order to prevent the workpiece 900 from detaching from the positioning groove 110 , the notch 111 of the positioning groove 110 has a tendency to shrink.

All the positioning grooves 110 are connected to each other, or are distributed in multiple independent areas. The interconnected structure corresponds to that all frame bars on the workpiece 900 are embedded in the positioning groove 110 . However, the multiple independent areas correspond to the turning parts, apex parts or a certain cell of the workpiece 900. If a certain cell is rhombus, at least a part of the positioning grooves 100 encloses a quadrilateral area, which just accommodates the rhombus structure.

The workpiece 900 is constrained by the support body 100 except relying on the positioning groove 110 . Referring to FIGS. 7 to 11 , the present application also discloses a heat treatment mold, which also includes a binding member 140 for binding the workpiece 900 to the support body 100 .

The binding member 140 is in at least partial contact with the surface of the workpiece 900 in the heat treatment state, so as to prevent the workpiece 900 from leaving the positioning groove 110 in the radial direction. The binding member 140 is wound on the support body 100 and is related to the distribution of the positioning grooves 110 , for example, if the positioning groove 110 is disposed outside the support body 100 , then the binding member 140 is wound on the outside of the support body.

Wherein, the binding member 140 is a winding and bending binding wire, or a rigid ring. The material used is metal, with a temperature resistance of at least 400 degrees Celsius, which meets the heat treatment requirements.

No matter what structure the binding member 140 adopts, the corresponding supporting body 100 should have a matching position for positioning the binding member 140 . In one embodiment, the outer periphery of the supporting body 100 is provided with a slot 141 for positioning the binding member 140 . The binding member 140 can be loaded according to a preset path or position and bound to the workpiece 900 , which facilitates the binding operation on the one hand and achieves the best binding effect on the other hand.

The distribution mode and structural features of the card slot 141 are as follows:

In one embodiment, one or more locking slots 141 are arranged at intervals along the axial direction of the support body. Each of them can be parallel to each other or interlaced with each other. Referring to FIG. 7 and FIG. 8 , they are preferably parallel to each other, and there are multiple corresponding binding members 140 .

Taking the above-mentioned workpiece 900 as an example with a net-tube structure as an example, the radial turning part 921 and other nodes of the workpiece 900 need to be restrained, and the rest of the parts can be changed naturally. In this embodiment, the area where the positioning grooves 110 are distributed on the support body 100 is the working area, and the working area has one or more radial turning parts 142, and the position of the locking groove 141 corresponds to each radial turning part 142 (understanding Positioning slots and locking slots are provided at least at the radial turning portion 142 for binding the waist of the workpiece 900). The radial turning point 142 of the working area is located at the waist of the support with the smallest diameter, and corresponds to the radial turning point 921 of the workpiece 900 .

The positioning groove 110 corresponds to the radial turning portion of the workpiece 900 , and the binding member 140 at least constrains the radial turning portion 921 of the workpiece 900 .

In another embodiment, the slots 141 are located at both axial ends of the working area. Bundle 140 may bind nodes located on the end face of workpiece 900 .

Referring to FIGS. 9 to 11 , in another embodiment, the locking groove 141 is spirally wound around the outer periphery of the supporting body 100 . Then, there can be only one set of clamping slots 141, and the corresponding binding piece 140 is a binding wire structure, and only one piece. The binding piece 140 can be automatically rotated and tied by a machine, which improves the binding efficiency compared with multiple sets arranged at intervals. In this embodiment, the slot 141 circles around the support body 100 at least twice.

The binding piece can also be a ferrule complementary to the shape of the support body. The ferrule is fastened on the support body and cooperates with the positioning groove to form a closed cavity. Preset requirements, more precise. Wherein, the complementary shape means that the outer peripheral surface of the support body and the inner peripheral surface of the ferrule fit each other in a buckled state, and the ferrule is split for convenience of buckling.

Referring to Figures 9 to 13, in another embodiment, there is a recessed avoidance area 130 in the area corresponding to the position of the workpiece on the support body 100, and when the workpiece 900 and the support body 100 are in a mated state, the workpiece 900 and the avoidance area A predetermined radial gap is left between the zones 130 . The dismantling tool can extend into the radial gap, and then pull the workpiece 900 away from the supporting body 100 . There may also be a gap between the avoidance area 130 and the circumferential side of the workpiece, so as to facilitate the insertion of the removal tool. Wherein, the area where the positioning grooves 110 are distributed on the support body 100 is the working area, and the avoidance area 130 is formed by the local depression of the working area.

Combining with the aforementioned workpiece 900 is a radially deformable mesh tube structure and includes a plurality of grids surrounded by frame bars, the avoidance area 130 corresponds to the apex 923 of the grid 902 on the workpiece 900 . After the apex part 923 first breaks away, it drives the peripheral frame bar 901 to move away from the positioning groove 110 .

The surface of the support body 100 is provided with a hollow portion 131 communicating with the inner side. The material requirement of the support body 100 is reduced. Preferably, the hollowed out part 131 communicates with the avoidance area. Then, the gap between the avoidance area 130 and the circumferential side of the workpiece 900 is increased, so that the tool can directly extend into the workpiece 900 to assist in dismantling the workpiece 900, thereby improving the disassembly efficiency.

An embodiment of the present application discloses a heat treatment mold. A chute 150 is provided on the support body 100 . The heat treatment mold also includes an adjustment member 151 movably fitted in the chute 150 . The adjustment member 151 is used to abut against the corresponding part of the workpiece 900 .

Referring to Figures 14 to 17, the adjusting member 151 can move along the chute 150 and act on the apex 923 of the workpiece 900 to shape the apex 923. In this embodiment, the chute 150 extends axially along the support body, In other embodiments, the extension direction can be changed correspondingly according to the structural characteristics of the workpiece.

In order to realize the visual adjustment, the supporting body 100 is provided with marks 152 indicating the relative position of the adjustment member 151, and the marks 152 may be a plurality of notches arranged along the slide groove.

According to the number of adjusting parts, there can be several sliding grooves 150 distributed along the circumferential direction of the supporting body. The adjustment member is connected at the junction.

Since the supporting body is a through structure, the inside is hollow, allowing the adjustment parts 151 to meet inside. There are multiple adjusting pieces 151 and slide grooves 150 , on the one hand, the sliding stability is improved, and on the other hand, nodes of the workpiece 900 on the same radial plane can be adjusted synchronously. Preferably, along the axial direction of the support body, one end of each slide groove 150 is an open structure for the disassembly and assembly of the adjusting member 151 .

In Fig. 14, the supporting body 100 has an opposite top side 108b and a bottom side 109b in the axial direction, the chute at least includes a first chute 157 and a second chute 158, and the first chute 157 opens toward the top side 108b of the support body , the second slide slots 158 open toward the bottom side 109b of the support body, and along the circumferential direction of the support body, the first slide slots 157 and the second slide slots 158 are alternately arranged.

The adjusting part 151a can slide into the first sliding groove 157 from the top side 108 and act on the apex portion 923c on the bottom side, and the adjusting part 151b can slide into the second sliding groove 158 from the bottom side 109 and act on the apex on the top side Site 923d.

In FIG. 15 , all the adjustment elements that need to move synchronously meet at the same connecting ring inside the support body. Combined with the aforementioned first chute 157 and second chute 158, there are at least two connecting rings 153, one connecting ring 153a is connected to the adjustment member 151a that slides into the first chute 157 from the top side 108b, and the other connecting ring 153b is connected to the The bottom side 109b slides into the adjusting part 151b of the second slide groove 158 .

In another embodiment, the heat treatment mold further includes a pulling member 154 acting on the adjusting member 151 to drive the adjusting member 151 to move along the chute 150 where it is located. The pulling member 151 has at least two ends, and one end is directly connected to the adjusting member 151 or connected to the connecting ring 153 . The other end is fixed after the adjustment member 151 reaches the desired position, for example, tied to the support body 100 to keep the adjustment member 151 fixed. The pulling member 154 is a pulling wire and is made of metal material, has a certain deformation ability and meets heat treatment requirements.

Wherein, the supporting body 100 defines a guide hole 155 through which the pulling member 154 passes. The pulling member 154 passes through the guide hole 155 from the inside of the support body and protrudes out of the support body. Taking the wall of the guide hole 155 as a fulcrum, the pulling member 154 is pulled to drive the adjustment member 151 to move. In combination with the aforementioned adjustment pieces 151 having multiple pieces, the number of the guide holes 155 and the pulling pieces 154 is at least consistent with the number of the adjustment pieces 151 . The plurality of pulling members 154 need to be pulled synchronously, and synchronous pulling should be understood as that each adjusting member 151 is driven by the corresponding pulling member, and the moving direction and adjusting speed are consistent.

In one embodiment, the adjusting member 151 has a radial limiting portion 156 , and the radial limiting portion 156 abuts against the supporting body 100 .

The two offset each other to act as a sliding guide for the adjusting member 151 . Referring to the foregoing, there are multiple adjusting members 151 , corresponding to multiple radial limiting portions 156 , and the interaction between the multiple radial limiting portions 156 restricts the movement of the adjusting member 151 in the radial direction. In addition, the inside of the support body 100 is cylindrical with the same radial dimension within the sliding stroke of the adjusting member 151 , so as to avoid interference with the radial limiting portion 156 .

This embodiment includes a binding piece 140 , wherein the supporting body 100 is provided with a slot 141 for positioning the binding piece 140 . The distribution and specific structure of the card slots 141 refer to the foregoing embodiments.

An embodiment of the present application discloses a heat treatment mold. The supporting body 100 is an integral structure or a split structure including a plurality of unit segments 160 along the axial direction.

Referring to Figures 18 to 20, due to the dimensional error of the workpiece 900 during the machining process, error accumulation is prone to occur during the assembly process of the workpiece, that is, the position deviation between the workpiece and the positioning groove 110 gradually increases as the assembly progresses. Even assembly fails. The split structure is that a plurality of unit segments 160 are spliced together to form the support body 100 , which can offset the influence of the workpiece 900 in the assembly process caused by machining errors. For other structures, refer to the foregoing embodiments, and will not be described here again.

For the split structure, the arrangement of the positioning groove 110 is:

Among the multiple unit segments 160 , only some of the unit segments 160 are provided with the positioning groove 110 , or all the unit segments 160 are provided with the positioning groove 110 . Wherein, the unit segment 160 provided with the positioning groove 110 can constrain the workpiece 900, and the unit segment 160 not provided with the positioning groove 110 can be offset against the workpiece 900, assisting the transition of the workpiece 900, or used as a connecting part for connecting axially adjacent two parts. Unit segment 160 .

The unit segments 160 can be adjusted and changed, and the positioning groove 110 where they are located will change accordingly, so as to facilitate the cooperation of the workpiece 900 with the positioning groove.

Referring to Fig. 11, wherein, the positioning groove 110 can be arranged on the inner edge or the outer periphery of the unit segment 160, and according to the arrangement of the positioning groove 110, the unit segment 160 can be divided into an outer embedded unit segment 160a or an inner embedded unit segment 160b, and an inner embedded unit segment 160b is arranged at the end of the support body 100, and is used to drive the end of the workpiece 900 to retract radially. The notch 111 of the positioning groove on the embedded unit segment 160b faces the inner side 102. Preferably, the positioning groove 110 is axially Through, one end is open for the workpiece 900 to protrude, and the other end is open for the special structure of the workpiece to protrude, such as the connection part 904 used for installation and cooperation with interventional instruments in FIG. 10 .

For example, the axial distance between two adjacent unit segments 160 is adjustable. Another example is the rotational fit between two adjacent unit segments 160 around the axis of the support body. Adjust the machining error in the axial direction and the circumferential direction. Moreover, a locking mechanism that restricts axial movement and/or circumferential rotation is provided between the unit segments 160 . The unit segments 160 can be adjusted when unlocked, and the positions between the unit segments 160 are relatively fixed when locked.

In this embodiment, the axial distance between adjacent unit segments 160 is adjustable, wherein two adjacent unit segments 160 are movably inserted and fitted along the axial direction of the support body.

The plug-in fit is understood to mean that there is damping at the plug-in fit between two adjacent unit segments 160 , such as a tight fit. The separation between the two unit segments 160 is limited, but one of them is allowed to move in the axial direction after being stressed, so that the distance between the two can be adjusted but not separated. Specifically, the insertion fit may be that two adjacent unit segments 160 are provided with matching pins and sockets on the opposite axial end faces. For example, in FIG. 20 , a pin 161 extends axially between the adjacent positioning grooves 110 of the inner unit segment 160 b , and the corresponding adjacent outer unit segment 160 a is provided with an insertion hole 162 matching with the pin 161 .

The intersection of two adjacent unit segments 160 is located at a radial turning point (for example, the smallest diameter portion) of the support body 100 , which is more convenient for assembly. Wherein, all or part of the unit segments 160 are provided with a slot 141 for positioning the binding member 140 . The distribution and specific structure of the card slots 141 refer to the foregoing embodiments.

An embodiment of the present application provides a workpiece heat treatment method, including a heat treatment mold and a workpiece, the ring heat treatment mold includes a support body, the ring support body has an axial direction in space, and positioning grooves are distributed on the ring support body; The workpiece is in the form of a mesh tube, having a first shape before heat treatment and a second shape after heat treatment;

The heat treatment method for the ring workpiece includes embedding at least a part of the workpiece having a first shape into a positioning groove corresponding to the position, so that the workpiece is constrained and shaped by the ring support body;

The ring workpiece and the ring heat treatment mold are heat-treated to obtain a workpiece with a second shape.

The heat treatment method of the workpiece can use the heat treatment mold mentioned in all the embodiments of this application, and the support body can be formed by 3D printing, which can be an integral structure or a split structure in the axial or circumferential direction. The workpiece can generally be cut from a pipe by laser. In order to adapt to the shape in the body, the workpiece is partially embedded in the positioning groove after cutting and bound by the positioning groove, and then heat-treated to shape it. Here, it is not required that all parts of the workpiece be embedded in the positioning groove. On the one hand, it may be possible to achieve the purpose of overall shaping through local limit pulling.

Since the first shape to the second shape are changed in diameter, when the deformation amount is large, one or more intermediate parts with gradient diameter can be used to process successively, that is, the heat treatment is divided into multiple stages, and each stage is only for the workpiece The local or successive approximation of the second shape. The intermediate piece can adopt a relatively simple shape, or have the same structural features as the support body of the present application, that is, multiple heat treatment molds of different sizes are used during the entire heat treatment process.

Wherein, the workpiece 900 is a deformable mesh cylinder structure, and at least a section of the axial region of the workpiece is embedded in the positioning groove 110 after being enlarged in diameter, and is constrained in the expanded state.

Referring to Fig. 5 and Fig. 6, the other structural shapes of the tubular workpiece 900 refer to the foregoing embodiments, including multi-circle grids 902 in the axial direction, and each grid 902 is composed of a plurality of frame bars 901 and includes a plurality of apex positions 923 and/or turning point (radial turning point 921 or turning point 922 on the peripheral surface), and at least a section of the axial region of the workpiece can be understood as at least one ring of mesh 902 in the axial direction, for example, Figure 18-20 , the workpiece 900 has 8 circles of grids, and the frame strips 901 or apex parts 923 of some grids are not embedded in the positioning groove 110, but the adjacent embedded parts make the unembedded parts naturally deform and transition. As another example, as shown in FIG. 7 and FIG. 8 , the workpiece 900 includes 9 circles of grids 902 and all of them are embedded in the positioning groove 110 . Of course, it is also possible that only one ring of grids is embedded in the positioning groove, or that a ring of vertices on an annular area is embedded in the positioning groove.

In this embodiment, after at least a part of the workpiece 900 is embedded in the positioning groove 110 , at least a part of the opening of the positioning groove is closed to restrict the workpiece 900 in the positioning groove 110 . The form of closing the opening can use the binding member in the foregoing embodiments, and there are many ways to wrap the binding member 140 . For example: referring to Figs. 1 to 3, only the axial ends of the workpiece 900 are wound and bound; referring to Figs. The binding member 140 is wound in the annular area, corresponding to a plurality of slots 141 parallel to each other; referring to FIGS.

21 to 23, an embodiment of the present application discloses a heat treatment mold. Compared with the previous embodiments, the support body includes one or more rings 170, and the outer circumference and/or inner edge of each ring 170 is provided with Positioning slots 110 , under the heat treatment state, each ring piece 170 is arranged sequentially along the axial direction of the support body, at least a part of the workpiece 900 is embedded in the corresponding positioning slot 110 , and is constrained and shaped by each ring piece 170 .

Wherein, the ring 170 has an axis 103 and also has a radial direction, the inner side 101 refers to the side close to the axis 103 , and the outer side 102 refers to the side away from the axis. The ring member 170 can be one, or a plurality of mutually cooperatively formed. The workpiece 900 (that is, the interventional instrument) has certain deformability, and after it is installed on the ring member 170 in a curved manner, it is heat-treated as a whole to achieve the final shape of the workpiece.

The installation process includes that at least a part of the workpiece 900 is embedded in the positioning groove 110 , so that a part is constrained by the ring 170 and other parts transition naturally; The constraint force can be the force generated by the mutual fit between the positioning groove 110 and the workpiece 900, etc., and is used to restrict the axial and/or radial movement of the workpiece 900, and can also be understood as the change of the workpiece 900 along the path defined by the positioning groove 110 . The positioning grooves 110 extend axially and/or radially on the ring member 170 and have a shape. The positioning grooves 110 are mutually interrupted, but allow the ring members 170 to communicate with each other after splicing.

Wherein, due to the dimensional error of the workpiece 900 during the machining process, errors are prone to accumulate during the assembly process of the workpiece, that is, as the assembly proceeds, the positional deviation between the workpiece and the positioning groove 110 gradually increases, and even the assembly fails. The plurality of rings 170 are allowed to move relative to each other in the axial direction, for example, each ring 170 can slide in the axial direction, etc., which can offset the influence of the workpiece 900 during the assembly process due to machining errors.

The mutual cooperation between the above-mentioned multiple rings 170 is understood to mean that all the rings 170 are arranged in the axial direction, and there may also be multiple rings 170 in the radial direction, for example two, on the corresponding two rings 170 The positioning grooves 110 are located on the outer periphery and the inner edge respectively, and bind the parts of the workpiece located there.

Taking the technical solution of a single ring as an example, the ring 170 includes the following types:

Referring to FIG. 21 , the inner ring 173, the positioning grooves 110 are distributed on the outer circumference of the inner ring 173, and at least a part of the workpiece 900 is sheathed on the outer circumference of the inner ring 173 in the heat treatment state;

Referring to FIG. 22 , the outer ring 174 has positioning grooves distributed on the inner edge of the outer ring, and at least a part of the workpiece 900 in the heat treatment state is located on the inner periphery of the outer ring 174 .

Wherein, the inner ring 173 mainly acts on the workpiece 900 to make it radially expand, and the outer ring 174 mainly acts on the workpiece 900 to make it shrink in the radial direction. Of course, the inner and outer rings can also guide the workpiece 900 to change along the circumferential direction. The area of the ring member 170 provided with the positioning groove 110 is the working area 120 , and in the axial direction, a single ring member 170 is provided with only one section or multiple sections of the working area 120 . A section of the work zone 120 bounds only a portion of the workpiece 900 . If the workpiece is shaped as a whole, multiple operations of loading the ring 170 and heat treatment are required, and each operation needs to load a ring 170 at a different position in the axial direction.

Referring to FIG. 23 , the multi-segment working area 120 can restrain the workpiece 900 at different positions in the axial direction at the same time, which can reduce the times of loading and heat treatment of the ring 170 .

For the detailed description of the specific structures of the ring member 170 , the positioning groove 110 and the workpiece 900 , refer to the following embodiments.

In one embodiment, the workpiece 900 is a self-expanding interventional device. Such devices can be stents in the cardiovascular system and atrioventricular valve stents. The common form can be an axially penetrating mesh tubular structure. The wall of the tubular structure is a uniform or non-uniform grid structure. The uniform grid structure It can be understood that the geometric configuration of each cell is the same or similar. The material of the workpiece 900 can be a memory metal, for example, the workpiece 900 is made of nickel-titanium alloy. Of course, the workpiece 900 is not limited to self-expandable interventional instruments, and may also be other tubular-shaped workpieces.

Referring to Figure 24 and Figure 25, the distribution of positioning grooves is not required to accommodate all parts of the workpiece. According to the key parts of shaping, the following parts of the workpiece can be preferably corresponded to:

(1) The distribution area of the positioning groove 110 can accommodate at least the vertex 923 of the grid 902 on the workpiece 900 , that is, including the V-shaped end point 923 a and also including the X-shaped node 923 b at the intersection of multiple cells. It can be understood that the vertex 923 is the grid node of the mesh cylinder workpiece.

(2) The distribution area of the positioning groove 110 can at least accommodate the radial turning portion 921 of the frame bar on the workpiece 900 . The radial turning point can be understood as the area where the diameter of the workpiece changes significantly.

(3) The distribution area of the positioning groove 110 can accommodate at least the turning point 922 of the frame bar 901 on the workpiece 900 on the peripheral surface of the workpiece. The frame bars between two adjacent nodes generally have no obvious distortion themselves, and when there is obvious distortion, it can be understood as a turning point on the peripheral surface.

Wherein, the positioning groove 110 has a notch 111 for inserting the workpiece 900 . The width of the positioning groove 110 is consistent with the width of the frame bar at the corresponding position or slightly wider than the frame bar 901 . It facilitates the loading and unloading of the workpiece 900 and provides a certain limit effect in the circumferential direction. At the same time, in order to prevent the workpiece 900 from detaching from the positioning groove 110 , the notch 111 of the positioning groove 110 has a tendency to shrink.

In order to be able to guide the corresponding change of the turning point or the apex portion 923, in one embodiment, one end of the positioning groove 110 in the axial direction of the ring member is an open port 112, or both ends are open ports 112, at least one of which Port 122 is in the form of a flare. Wherein, referring to FIG. 26 to FIG. 28 , the flaring form should be understood as that the two sides of the port 112 are away from each other along the circumferential direction, and change in an arc shape, so that the workpiece 900 can bend and change in the circumferential direction. Only one end of the ring member 170 is an open port 112 , and the other end is closed or not embedded with the workpiece 200 , so the positioning groove 110 acts on the endpoint of the edge of the workpiece 900 , forming a V shape corresponding to the embedded part of the workpiece 900 .

Referring to FIG. 27 , both ends of the ring 170 are open ports 112 and the workpiece 900 is embedded therein. The positioning groove 110 acts on the X-shaped node 923 b of the workpiece 900 , and the corresponding embedded part of the workpiece 900 forms an X shape.

In order to effectively guide the shape of the workpiece 900 to change accordingly, a positioning boss 178 is provided at the middle of the port 112 along the axial direction of the ring. In combination with the foregoing, when the positioning groove 110 constrains the V-shaped end point, there is only one positioning boss 178 , and the position of the arrangement is within the grid 902 . When the positioning groove 110 constrains the X-shaped nodes, there are also two positioning bosses 178 .

Referring to FIG. 28 , in one embodiment, the positioning groove 110 extends with equal width and the extending path is a straight line or a curve, and the straight line is parallel to the axial direction of the ring or forms an included angle α. The included angle α ranges from 0° to 90°.

In another embodiment, there are multiple ring members 170 , and adjacent ring members 170 are stacked or arranged at intervals along the axial direction of the ring members.

When the positioning grooves 110 corresponding to the respective ring members 170 are in mutual communication, there is a possibility that the positioning grooves 110 can accommodate the frame bar 901 used on the workpiece 900 . This enables the workpiece 900 to be pre-shaped according to the artificially set positioning groove.

When arranged at intervals, the positioning grooves 110 corresponding to the ring members 170 are distributed in independent areas. At this time, the positioning grooves 110 act on the apex 923 of the workpiece 900 .

Firstly, the area where the positioning groove 110 is opened on the ring member 170 is the working area 120 . For the stacked structure, wherein, along the axial direction of the ring, the end surface of the ring 170 is a plane. Along the axial direction of the rings, a positioning mechanism is provided between adjacent rings 170 to limit the relative rotation of the two. It facilitates stacking and assembly of adjacent ring pieces 170 , and the positioning structure plays a limiting role when the ring pieces 170 are stacked, so as to avoid affecting the predetermined shape of the workpiece 900 .

For the structure arranged at intervals, in one embodiment, the area where the positioning grooves 110 are distributed on the ring 170 is the working area 120, and along the axial direction of the ring, the working area 120 on the same ring 170 is arranged as one section or at intervals as multiple sections , there are radial depressions between the multi-section working areas 120 . The number of ring parts can be reduced, and the corresponding assembly operations can be reduced. It is generally used in parts of the workpiece 900 where the machining error is small.

Along the axial direction of the rings, adjacent rings 170 are independently arranged or fixed to each other by connecting pieces 171 . The connecting piece 171 is used to connect each ring piece 170 as a whole or as a movement guide part of each ring piece, and each ring piece 170 can move along the axial direction. Whether provided independently or fixed by connectors, all annular members 170 comprise at least one of the following types:

The inner ring 173, the positioning grooves 110 are distributed on the outer periphery of the inner ring 173, at least a part of the workpiece 900 in the heat treatment state is sleeved on the outer periphery of the inner ring 173;

In the outer ring 174 , the positioning grooves 110 are distributed on the inner edge of the outer ring 174 , and at least a part of the workpiece 900 in the heat treatment state is located in the inner periphery of the outer ring 174 .

The workpiece is a radially deformable grid-like structure, and includes multiple grids surrounded by frames. The diameter of the workpiece in its initial state is smaller than the diameter of the support body, and it needs to be expanded during loading. For multiple stages, after loading on the support body, stress will inevitably be generated due to the radial deformation of the workpiece. One of the purposes of heat treatment is to eliminate these stresses as much as possible, so that the workpiece can be kept in a spatial structure that matches the support body. type.

In the prior art, when loading, the workpiece is often damaged due to excessive stress. In the preferred mode of the present application, the central area of the positioning groove on the ring part corresponds to the grid node on the workpiece, that is, each positioning groove is mainly aimed at the grid nodes. The nodes are limited, and the frame strips between the nodes allow their adaptive deformation to be pulled between the grid nodes in a stress-minimized manner. In order to reduce the binding of the positioning grooves to the frame strips (especially the parts away from the grid nodes), along the axial direction of the support body, the ring member should be kept at a small width, for example, 3-20mm. If the grid size is used as a reference, along the axial direction of the support body, the width of the ring is less than or equal to the size of a grid at this position of the workpiece, that is, only one grid node corresponds to the axial span, and the axial position is adjacent The two grid nodes need to be configured with different rings to limit the position, so as to ensure the flexible use of the ring. For example, the width of the ring 170 in FIG. 29 is W1, the span of the grid 902 at this position is W2, and W1 is less than or equal to W2. Furthermore, W1 is equal to 0.3-0.6 times W2.

Referring to FIGS. 30 to 35 , each ring member 170 includes a first inner ring 173 a , a second inner ring 173 b , a third inner ring 173 c and an outer ring 174 in sequence along the axial direction. Wherein, there are a plurality of positioning grooves 110 and are distributed at intervals along the circumferential direction on each ring member 170 , and the positioning grooves 110 act on the apex 923 , so the number of positioning grooves 110 corresponds to the number of grids 902 . In this example,

The first inner ring 173a has 12 positioning slots 110 , the second inner ring 173b has 12 positioning slots 110 , and the third inner ring 173c has 12 positioning slots 110 . The radial dimensions of the three inner rings from large to small are the third inner ring 173c, the first inner ring 173a and the second inner ring 173b. The changes in the radial dimensions drive the radial changes of the workpiece 900, and the adjacent rings 170 The positioning grooves 110 located therebetween are misaligned with each other.

The outer ring 174 acts on the workpiece 900 to form a V-shaped end point 923a, corresponding to two frame bars that need two positioning grooves 110 to be constrained, and the end of the workpiece 900 includes 12 grids 902, then the number of corresponding positioning grooves 110 is 24 and along the Circumferentially spaced distribution.

Referring to FIG. 36 and FIG. 37 , in one embodiment, the outer ring 174 includes a multi-segment ring body 179 , and the multi-segment ring body 179 moves along the radial direction and assembles with each other to form the outer ring 174 . To facilitate assembly, the outer ring 174 is preferably a circular ring, including two ring bodies 179 . Wherein, the two-section ring body 179 is a semicircle.

Regarding the fixing method of the connecting piece, the connecting piece 171 may be a part of the ring piece 170 or a separate component. For example, as a part of the ring 170, there is a locking structure that cooperates with each other and restricts the separation of the two rings between adjacent rings 170. The locking structure can be a latch that is arranged on one of them and a latch that is arranged on the other. The socket that the bolt matches, and both the bolt and the socket are connecting parts 171 .

Another example is that the connecting piece 171 is a separate component. Referring to FIGS. 30 to 33 , the heat treatment mold further includes a core rod 172 , and all ring members 170 are fixedly or movably sleeved on the core rod 172 . Here, the core rod 172 is used as the connecting piece 171, and an axial positioning structure that cooperates with each other is provided between the ring piece 170 and the core rod 172. block, and a positioning groove that is arranged on the other to cooperate with the positioning block. It is also possible that the core rod 172 and one of the ring members 170 are provided with an axial positioning structure that cooperates with each other, and locking structures are provided between the other ring members 170 . Wherein, the core rod 172 is a hollow or solid structure. The preferred core rod 172 is a hollow structure.

The ring member 170 is slidably sleeved on the core rod 172 , and a guiding structure cooperating with each other is provided between the ring member 170 and the core rod 172 . Among them, the guiding structure includes:

The guide groove 175 is disposed on one of the core rod 172 or the ring member 170;

The guide bar 176 is disposed on the other one of the core rod 172 or the ring member 170 and cooperates with the guide groove 175 .

Preferably, there are multiple guide grooves 175 distributed on the outer periphery of the core rod 172, and each guide groove 175 extends axially along the ring member. Each ring member 170 is guided to move in the axial direction, and correspondingly, the rotation of each ring member 170 in the axial direction can also be restricted.

In order to visualize the adjustment of the ring 170 , the core rod 172 is provided with marks indicating the relative position of the ring 170 . The mark may be a scale, which reflects the moving distance of the corresponding ring 170 or the distance between the rings 170 .

During the installation process, the workpiece 900 has radial changes of outward expansion and internal contraction. In order to prevent the workpiece 900 from falling out of the positioning groove 110 in the radial direction, especially at the radially inward position and the ring member 170 adjacent to the radially inward position It is very easy for the workpiece 900 to break away from the positioning groove 110 .

In order to solve the above-mentioned problems, the outer ring 174 in the previous embodiment can be used for binding. In another embodiment, the heat treatment mold further includes a binding member 140 for binding the workpiece 900 to the ring 170 .

Referring to FIG. 38 , the binding member 140 is in at least partial contact with the surface of the workpiece 900 in the heat treatment state, preventing the workpiece 900 from detaching from the positioning groove 110 in the radial direction. The binding member 140 is wound on the ring member 170 and is related to the distribution of the positioning grooves 110 , for example, if the positioning groove 110 is arranged outside the ring member 170 , then the binding member 140 is wound on the outside of the ring member. In order to facilitate binding, the binding member 140 is a winding and bending binding wire, or a rigid ring. The material used is metal, with a temperature resistance of at least 400 degrees Celsius, which meets the heat treatment requirements.

In one embodiment, part or all of the outer circumference of the ring member 170 is provided with a slot 141 for positioning the binding member 140 .

In one embodiment, the locking grooves 141 are multiple sets arranged at intervals along the axial direction of the ring member. A ring member 170 has at least one set of engaging grooves 141 .

Taking the aforementioned workpiece 900 as an example of a self-expanding interventional device, the workpiece 900 and other nodes need to be restrained, and other parts can be changed naturally. In this embodiment, the area where the positioning grooves 110 are distributed on the ring member 170 is the working area, and the working area has one or more radial turning parts 142 , and the positions of the locking grooves 141 correspond to the radial turning parts 142 . The positioning groove 110 corresponds to the radial turning portion of the workpiece 900 , and the binding member 140 at least constrains the radial turning portion 921 of the workpiece 900 .

In another embodiment, the slots 141 are located at both axial ends of the working area. The binding 140 may bind the nodes located on the end face of the workpiece 900 .

In another embodiment, the engaging slots 141 are spirally arranged on each ring member 170 . It can be understood that although the rings are arranged at intervals, and the grooves 141 on the corresponding rings are interrupted from each other, the paths of the grooves 141 tend to be connected and form a helical line. Then the binding piece 140 can be bound by automatic rotation of the machine, which improves the binding efficiency.

The axial assembly structure of multiple rings facilitates the assembly between the workpiece 900 and the ring 170 . At the same time, in order to facilitate disassembly. In one embodiment, the annular member 170 has an avoidance area 130 , and there is a force application gap for removing the workpiece between the workpiece 900 in the heat treatment state and the bottom of the avoidance area 130 . The removal tool can be extended into the force application gap, and then pull the workpiece 900 out of the ring 170 .

Wherein, the avoidance area 130 includes at least one of the following forms:

a. The groove bottom of the positioning groove 110 is partially depressed to form an avoidance area 130;

b. Referring to FIG. 39 , the area where positioning grooves are distributed on the ring member 170 is the working area 120 , and the rest is the transition area 121 . Wherein, the single ring member 170 has at least two working areas 120 in the axial direction, and the radial recess between the two working areas 120 is the transition area 121 . Of course, the gap between the adjacent annular members 170 can also be used as the avoidance area 130 .

Combining with the aforementioned workpiece 900 is a radially deformable mesh tube structure and includes a plurality of grids surrounded by frame bars 901 , the avoidance area 130 corresponds to the turning point or apex 923 of the grid 902 on the workpiece 900 . After the part is disengaged, the peripheral frame bar 901 is driven to disengage from the positioning groove 110 .

An embodiment of the present application provides a heat treatment method for a workpiece. The workpiece is a cylindrical structure and includes multiple sections of regions to be shaped in the axial direction. The heat treatment method for the workpiece includes:

Provide heat treatment mold with positioning groove;

The workpiece is heat treated together with the heat treatment mold.

The workpiece can generally be cut from a pipe by laser. In order to adapt to the shape in the body, the workpiece is partially embedded in the positioning groove after cutting and bound by the positioning groove, and then heat-treated to shape it. The workpiece has a certain axial length, but not all parts need to be shaped by positioning grooves. The areas to be shaped are spaced apart from each other, and the purpose of overall shaping can be achieved by pulling the areas to be shaped on the adjacent parts. .

The successive embedding of each area to be shaped can be understood as the overall installation sequence, or the heat treatment mold itself is a split structure that includes multiple components, and each area to be shaped is assembled with the corresponding components one by one.

Referring to Fig. 40, when a split structure is adopted, the heat treatment mold includes each ring piece 170, and the structure of the ring piece 170 refers to the previous embodiment. Each ring is equivalent to one of the components, the workpiece 900 includes a multi-circle grid 902, and each circle grid 902 includes a vertex 923 (grid node) in a ring-shaped area, and the area 924 to be shaped is a ring-shaped area In the apex position, each area 924 to be shaped corresponds to the positioning groove 110 installed on a ring 170, and is installed in stages in a certain order, and only one area 924 to be shaped and one ring 170 are loaded in each stage. .

The order in which each region 924 to be shaped is embedded in the positioning groove 110 is:

Method 1: The arrangement order of the area 924 to be shaped is consistent with the axial direction of the workpiece, for example, the inner ring 173 and the outer ring 174 are assembled with the workpiece 900 in sequence from one end in the axial direction.

Method 2: Along the axial direction of the workpiece, the sequence of embedding the unshaped regions 924 into the positioning groove 110 is as follows: firstly, the unshaped regions in the middle are embedded, and then inserted toward both ends one by one.

Method 3: Along the axis of the workpiece, the sequence of embedding the regions 924 to be shaped into the positioning groove 110 is as follows: firstly, the regions to be shaped at both ends are embedded, and then the regions to be shaped at the middle are embedded.

Compared with the first method, the latter two methods can avoid excessive one-way accumulation of errors and release or correct them in time.

It should be noted that when the outer ring has a one-piece ring structure, during the assembly process, the outer diameter of the inner ring 173 along the axial assembly path needs to be smaller than the inner diameter of the outer ring 174, so that the outer ring 174 can pass through to reach the corresponding area to be shaped 924. If there is an inner ring 173 with an outer diameter larger than the inner diameter of the outer ring on the assembly path of the outer ring 174, the outer ring 174 needs to be loaded first, and then the inner ring 173 needs to be loaded.

Wherein, referring to FIG. 36 and FIG. 37 , when the outer ring 174 is a split structure, the assembly sequence of the outer ring 174 is not strictly limited.

In this embodiment, after at least a part of the workpiece 900 is embedded in the positioning groove 110 , at least a part of the opening of the positioning groove is closed to restrict the workpiece 900 in the positioning groove 110 . The form of closing the opening may be the binding member 140 in the foregoing embodiments.

The heat treatment mold of the present application can use one or more ring parts to separate the heat treatment mold, which is more convenient for processing. For workpieces with different shape characteristics, the universality and standardization of mold parts can be realized to a certain extent; workpieces and ring parts It is more convenient to disassemble and assemble, and reduce the negative impact caused by accumulated errors.

An embodiment of the present application discloses a mold for heat treatment. The heat treatment mold is a cylindrical structure, and the support body 100 is a plurality of movable joints along the circumferential direction of the cylindrical structure. The support body is provided with positioning protrusions 110, and each positioning protrusion The space between the protrusions 110 is used as the positioning groove above, and the positioning protrusions 110 are used for limiting and shaping the workpiece.

Firstly, the workpiece 900 is, for example, a medical device, which can be a vascular stent, a heart valve stent, etc., and a common form can be an axially penetrating grid-like structure, and the wall of the grid-like structure is a uniform or non-uniform grid structure, wherein A uniform grid structure can be understood as the same or similar geometric configuration of each cell. The material of the workpiece 900 can be a memory metal, for example, the workpiece 900 is made of nickel-titanium alloy.

Referring to Fig. 41 and Fig. 42, each supporting body 100 is stitched together to form a cylindrical structure, the cylindrical structure has an axial direction and a radial direction, and it has an inner side 101 and an outer side 102 in the radial direction, and the side surrounded by the supporting body 100 is the inner side 101 , and the opposite side is the outer side 102 . Each supporting body 100 can move along the axial and/or radial direction and finally spliced into a cylindrical structure. When the splicing is completed, the supports 100 can interact to keep the cylindrical structure stable, and gaps between the supports 100 are also allowed, but other parts need to be connected with the supports 100 to keep the cylindrical structure stable. A smooth support surface 150 for supporting the workpiece 900 is formed. The workpiece 900 can first cooperate with one of the supports 100, and then the other supports 100 move and complete the cooperation with the workpiece 900 successively; it can also be that each support 100 moves synchronously, and completes the joint with the workpiece 900 while splicing into a cylindrical structure. Cooperate.

The positioning protrusions 110 can be a continuous whole or a plurality of discontinuous ones, and the protrusions protruding from the support surface 150 can act on each unit cell of the workpiece 900 to implement limiting shaping in the axial direction and the circumferential direction. The workpiece 900 may be partially limited by the positioning protrusion 110 to achieve local restraint; or all of the workpiece 900 may be limited by the positioning protrusion 110 to achieve overall restraint of the workpiece 900 .

As far as a single support body 100 is concerned, the support body 100 may have a single-layer structure in the radial direction or a double-layer structure at one end in the axial direction, then:

Referring to Figure 43 and Figure 44, the cylindrical structure is a single-layer structure in the radial direction, and the positioning protrusions 110 are arranged on the outer wall or inner wall of the support;

Referring to FIG. 45 , the cylindrical structure is a double-layer structure in the radial direction, including an inner layer 104 and an outer layer 106 , wherein positioning protrusions 110 are arranged on the outer wall of the inner layer 104 and the inner wall of the outer layer 106 .

The following embodiments specifically take the workpiece 900 on the outer wall of the cylindrical structure as an example.

The outer wall of the cylindrical structure acts on the workpiece 900, and in the radial direction of the cylindrical structure, the thicknesses of the supports 100 are the same or different. Preferably, the thickness of the support body 100 is 2-10 mm. When the thickness is the same, the outer peripheral surface and the inner peripheral surface of the cylindrical structure can be smooth arc surfaces; when the thickness is different, the thicker support body 100 protrudes toward the radial inner side of the cylindrical structure, at least ensuring that the outer wall of the cylindrical structure is Smooth camber. Wherein, the cross-sectional outer profile of the cylindrical structure (without considering the positioning protrusion 110 ) is circular or elliptical. The generatrix of the outer contour of the cylindrical structure (regardless of the positioning protrusion 110) is a straight line or a curve.

The cylindrical structure has an opposite first end surface 201 and a second end surface 202 in the axial direction, each support body 100 is aligned with each other at the first end surface 201, and the length is staggered at the second end surface 202; or each support body 100 is at the second end surface 202 The first end surface 201 and the second end surface 202 are aligned with each other. At least one of the end faces is guaranteed to be aligned, and this proves that each supporting body 100 is spliced in place in the axial direction. For example, as shown in FIG. 46 , the first end surfaces 201b of a plurality of support bodies 100b have been aligned with each other, and after the first end surface 201a of another support body 100a is flush with other first end surfaces 201b, it proves that the axial direction has been assembled in place. Certainly, after the splicing is completed in this embodiment, the second end surface 202a and the second end surface 202b are also aligned with each other.

The supports 100 interact with each other in the spliced state. In one embodiment, along the circumferential direction of the cylindrical structure, two adjacent supports 100 are fitted against each other through flat or arc surfaces to maintain a stable cylindrical structure and a long-term effective binding. Wherein, the mating surfaces between two adjacent supporting bodies 100 are arranged parallel to or inclined to the axial direction of the cylindrical structure as a whole.

In order to facilitate splicing between the supporting bodies 100 , a guiding structure cooperating with each other is provided between two adjacent supporting bodies 100 to guide them to slide relative to each other. The sliding direction can be axial or radial of the cylindrical structure. The guide structure is a guide groove provided on one of the two adjacent supports 100 , and a guide bar provided on the other to slide into the guide groove.

In some embodiments, along the circumferential direction of the cylindrical structure, interfitting insertion positioning structures are provided between two adjacent supporting bodies 100 . The plug-in positioning mechanism can be a positioning block provided on two adjacent supports 100, and a combination groove on the other that cooperates with the positioning block, for limiting the movement of the supporting body 100 and prompting that the supporting body 100 has been assembled in place.

Wherein, the support body 100 has a working state of enclosing a cylindrical structure, a first state of being further gathered inward relative to the working state, and a second state of being further away from the working state.

Referring to Fig. 47, the working state refers to the state in which adjacent supports 100 are matched against each other, and the workpiece 900 is attached to the outer wall of the support 100;

Referring to Fig. 48, the first state means that each supporting body 100 moves radially inwardly 101 and has a certain gap with the workpiece 900 for the removal or installation of the workpiece 900;

Referring to Fig. 49, the second state means that each support body 100 moves radially outward 102, thereby enlarging the radial dimension of the workpiece 900, wherein, there is a device between adjacent support bodies 100 to keep each support body 100 in the second state. positioning structure.

In one embodiment, the support body 100 is plate-shaped, and the thickness direction is consistent with the radial direction of the cylindrical structure, and the outer side of the support body is arc-shaped. The mold has a cylindrical structure in the working state, and in the first state, adjacent supporting bodies 100 can be partially overlapped. In order to maintain the working state or the second state of the supporting body 100, an external tool may be used, and the external tool may be a spring coil, a coil spring, or the like.

Wherein, along the axial direction of the cylindrical structure, at least one end of the support body 100 is provided with a coupling portion that cooperates with an external tool.

Both axial ends of the supporting body 100 have rounded corners, which facilitates the installation of the workpiece 900 or the supporting body 100 . In order to further improve the convenience of installation, the outer wall of the cylindrical structure has a smooth surface except for the positioning protrusion 110 . The smooth outer surface can be obtained by finishing or electrochemical treatment, such as grinding. The support body 100 is formed by 3D printing. And in order to meet the heat treatment environment, the support body 100 is made of metal powder, and its working temperature is at least 400 degrees Celsius. The 3D printing processing method can realize special structures that cannot be realized by machining, instead of traditional pin fixing, such as adding wire slots, restricting the workpiece 900 by binding wires, and improving the loading and unloading efficiency of the workpiece 900. Compared with the processing cost and processing cycle required for mold opening, 3D printing molds greatly reduce production costs and shorten the processing cycle.

In some embodiments, in the cylindrical structure, the number of supports 100 is 4-24, preferably 6-16, such as 8-12, preferably an even number. Wherein, each support body 100 has the same structure. In combination with the foregoing, it can be understood that the lengths, thicknesses, and other shapes of the supports 100 are the same, and have the same guiding structure.

As far as the positioning protrusions 110 are concerned, on the cylindrical structure, there are a plurality of positioning protrusions 110 arranged roughly in an array. The array arrangement can be understood as a row of positioning protrusions 110 roughly on the same radial plane, and a row of positioning protrusions 110 arranged longitudinally along the same straight line. In some embodiments, the number of rows of the positioning protrusions 110 is 1-16, and the number of columns is 1-6.

Referring to FIG. 50 , in one embodiment, all the supporting bodies include the first supporting body 204 with the positioning protrusion 110 and the second supporting body 205 without the positioning protrusion 110 . The second support body 205 is spliced with the first support body 204 to form a complete cylindrical structure, and the workpiece 900 is locally shaped by the first support body 204 with the positioning protrusions 110 . Among them, the arrangement order and shape difference of the two supports are:

The first support bodies 204 and the second support bodies 205 are alternately arranged.

The length and/or thickness and/or circumferential span of the first support body 204 and the second support body 205 are different.

In some embodiments, the cylindrical structure has an inner peripheral surface and/or an outer peripheral surface for the workpiece 900 to be placed in place, and the inner peripheral surface and/or outer peripheral surface are used as the working surface 203, and the positioning protrusions 110 are sparsely distributed on the working surface. Surface 203. Referring to FIG. 51 , the sparse distribution can be interpreted as a relatively low proportion of the area of the working surface 203 occupied by the positioning protrusions 110 . Wherein, the minimum of the positioning protrusion 110 only needs to ensure its own strength, and it is sufficient to ensure that the positioning protrusion 110 will not be damaged when the workpiece 900 is expanded, and it is sufficient to ensure that the workpiece 900 is not interfered with at the maximum.

In the present embodiment, the workpiece 900 is in place on the outer peripheral surface of the cylindrical structure, or on the working surface 203, and is divided into a plurality of regions along the axial direction of the mesh cylinder structure, and the working surface 203 is divided into several regions along the circumference of the mesh cylinder structure. Extending in a band shape, wherein referring to Fig. 53, the area where the positioning protrusions 110 are located is the working area S1, and the positioning grooves between the positioning protrusions 110 are the positioning grooves, that is, the gap area S2, and the area ratio of the working area S1 and the gap area S2 is 2: 1.

In one embodiment, the workpiece 900 has a grid structure and can be sleeved in a heat treatment mold, and the distribution positions of the positioning protrusions 110 correspond to the grid 902 of the corresponding workpiece 900 . Each grid 902 is enclosed by a frame bar 901 , the frame bar is shared between adjacent grids 902 , and the positioning protrusion 110 protrudes from the supporting surface 150 and extends into the grid 902 and acts on the frame bar 901 .

Referring to FIG. 52 , the positioning protrusions 110 are arranged in pairs, and the positioning protrusions 110 of the same pair correspond to two opposite sides in a grid 902 . Two opposite sides may refer to opposite sides in the axial direction or in the circumferential direction. Wherein, the same pair of positioning protrusions 110 are arranged along the circumferential direction of the cylindrical structure, acting on opposite sides of the grid 902 in the circumferential direction. Along the circumferential direction of the cylindrical structure, one side of the positioning protrusion 110 is the positioning side 111 that first abuts against the workpiece 900 , and the positioning side 111 is an arc surface structure. The positioning side 111 is used to fit the frame bar 901 on the grid 902 and make it bend in an arc. In the pair of positioning protrusions 110, the positioning sides 111 are opposite or opposite to each other.

The positioning protrusion 110 has a root 112 connected with the supporting body 100 and an opposite head 113, the head 113 is a smooth structure. Along the radial direction of the cylindrical structure, the height of the positioning protrusion 110 is thicker than the wall thickness of the medical device. Specifically, when the medical device is loaded, the height of the positioning protrusion 110 is 0.3-1.0 mm higher than the thickness of the medical device. In some embodiments, the position of the positioning protrusion 110 relative to the support body 100 is adjustable, and the positioning protrusion 110 is movably installed on the support body 100 to change the position of the positioning protrusion 110 itself, thereby changing the shape of the workpiece 900 . Wherein, the adjustable position of the positioning protrusion 110 includes at least being adjustable along the circumferential direction and/or the axial direction of the cylindrical structure. Of course, a positioning mechanism is provided between the positioning protrusion 110 and the supporting body 100 to limit the movement of the positioning protrusion 110 , so that the position of the positioning protrusion 110 remains unchanged so that the workpiece 900 can be shaped stably.

Referring to Fig. 55, the present application also provides a mold device for the circumferential movable splicing of the support body, including the heat treatment mold in the related embodiment and the base 400, the base 400 is surrounded by a plurality of installation positions 460, Each support body 100 in the heat treatment mold is placed in a corresponding installation position 460 and the circumferential position of each support body 100 is limited by the installation position 460 .

One installation position 460 corresponds to one or more support bodies 100 , and each support body 100 is placed on the installation position 460 so that the mold can maintain the cylindrical structure stably.

As shown in Figures 55 to 57, the base 400 includes a central column 410, a plurality of guide rails 420 and an ejector 430, wherein the central column 410 has opposite top ends 411 and bottom ends 412, and the plurality of guide rails 420 are radially distributed on the central column 410. At the bottom end 412 , each support body 100 is slidably installed on the corresponding guide rail 420 , and the ejector 430 abuts between the center column 410 and each support body 100 along the radial direction of the center column.

The central column 410 has the same axial direction as the mold, and the guide rails 420 are used to limit and guide the movement of the support body 100. In the figure, each guide rail 420 is a straight guide rail extending radially and radially and corresponds to the support body 100 one-to-one. The bodies 100 are slid along corresponding straight lines so that the molds form cylindrical structures with different diameters. When loading the workpiece 900, first slide each support body 100 close to the center column 410 to form a mold with a diameter smaller than the diameter of the medical device, and the medical device is sleeved on the outer periphery of the mold along the axial direction to facilitate the loading of the medical device (such as Fig. 58 and Fig. 59 ), and then the support body 100 slides away from the central column 410, acting on the medical device to expand to a predetermined size.

In one embodiment, the end of each guide rail 420 away from the center column 410 is provided with an anti-off head 421 that limits the extreme position of the support body 100 , and the anti-off head 421 is detachably connected to the guide rail 420 . The anti-off head 421 is used to prevent the support body 100 from sliding out. After the anti-off head 421 is disassembled, the support body 100 can be inserted into the guide rail 420 . In some embodiments, the anti-off head 421 is slidably disposed on the guide rail 420 for adjusting the sliding limit position of the support body 100 , and when the support body 100 reaches the limit position, the corresponding medical device expands to a predetermined size. Of course, a locking mechanism that restricts the sliding of the anti-off head 421 is provided between the anti-off head 421 and the guide rail 420 .

Wherein, the support body 100 is provided with a guide groove 160 cooperating with the guide rail 420 , and the guide groove 160 hugs two opposite sides of the guide rail 420 to limit the axial movement of the support body 100 along the central column. For example, the section of the guide groove 160 is T-shaped or cross-shaped, as shown in FIG. 60 and FIG.

As shown in FIG. 22 , a plurality of guide rails 420 intersect with each other and form a chassis 422 at the intersection. The top surface of the chassis 422 has a mounting slot 423 , and the bottom end of the central column 410 is inserted into the mounting slot 423 . The mounting slot 423 has a polygonal shape and is used to limit the circumferential rotation of the guide rail 420 relative to the central column 410 .

Referring again to Figures 55 to 59, the ejector 430 can exert a radial force on the inner surface of the support body 100, so that the support body 100 slides on the guide rail 420, and the working surface of the support body 100 (that is, the outer surface) side) is subjected to the force from the medical device, when the supporting body 100 receives the force in two directions and reaches a balance, the sliding of the supporting body 100 stops the expansion of the medical device to a preset size, and it can also be directly restricted by the position of the anti-off head Preset dimensions for medical devices.

The way that the ejector 430 applies force can be that the ejector 430 itself is an elastic member, such as a spring in the figure, or the ejector 430 is a rigid member, such as a push block of a tube expander, a linkage, etc. In the radial direction, the supporting body 100 is moved outwardly against the supporting body 100 or a gap is reserved inwardly for the supporting body 100 to slide close to the central column 410 .

In terms of quantity, one supporting body 100 corresponds to at least one ejecting member 430 , and at least one ejecting member 430 is disposed close to the top end of the central column 410 . In a preferred embodiment, one supporting body 100 corresponds to a plurality of ejectors 430, and the plurality of ejectors 430 are arranged axially along the central column.

According to the above-mentioned structure of the ejector 430 , the central column 410 is hollow or solid, and the outer periphery thereof is provided with a coupling hole 413 for accommodating each ejector 430 .

Referring to Figures 63 to 70, in another embodiment, the base 400 is columnar, and the support bodies 100 are arranged along the circumference of the base, and there are cooperating gaps between each support body 100 and the outer wall of the base 400. Circumferential limit structure. The base 400 is cylindrical, and its outer surface is in contact with the inner surface of the support body 100 . The circumferential limit structure is used to limit the movement of the support body 100 in the circumferential direction, and keep the mold in a cylindrical structure.

Wherein, the circumferential limiting structure includes a plurality of flanges 441 and limiting grooves 442, the plurality of flanges 441 are fixed on the outer periphery of the base 400 at intervals, the same flange 441 extends axially along the base, and the limiting grooves 442 are set in Each supports the side surface of the inner body, and engages with the flange 441 corresponding to the position. The flange 441 and the limiting groove 442 also serve as a sliding guide for the support body 100, and the support body 100 can slide axially.

In one embodiment, the mold device further includes an annular binding member 450 , which is placed around the periphery of all the supports 100 , and exerts a binding force against the base 400 on each support. On the one hand, the supports 100 are moved synchronously after being loaded on the base 400 , and on the other hand, the supports 100 are prevented from falling out of the base 400 in the radial direction. Wherein at least one section of the binding member 450 is an elastic structure, and the outer side of each supporting body 100 is provided with a winding groove 170 for accommodating the binding member 450 . After all the supports 100 are loaded on the base 400, the winding grooves 170 are connected to each other, and the winding grooves 170 are recessed toward the base 400 so that the binding member 450 does not protrude from the support 100 in the radial direction, which is convenient for medical devices. of loading. The elastic structural part of the restraint 450 can be deformed when loaded onto the winding groove 170 , which is convenient for assembly. Specifically, the restraint 450 can be a spring coil, a coil spring, and the like.

The present application also provides a method for heat treatment using the mold device of the above embodiment. The support body 100 has a working state of surrounding a cylindrical structure, and a first state of being further gathered inward relative to the working state. The workpiece is represented by the workpiece 900 For example, with a grid structure, methods include:

Set the workpiece 900 on each support body 100 in the first state;

Drive the support body 100 into the working state, and keep the grid 902 on the workpiece 900 aligned with the corresponding positioning protrusion 110;

The mold is heat-treated together with the workpiece 900 .

The workpiece 900 can generally be cut from a pipe by laser. In order to adapt to the shape inside the body, after cutting, the workpiece 900 is partly sleeved on the mold and constrained by the positioning protrusion 110, and heat-treated to shape it. Here, it is not required that all parts of the workpiece 900 are constrained by the positioning protrusions 110. On the one hand, the purpose of overall shaping may be achieved by local limit pulling, and in addition, the heat treatment may be divided into multiple stages, and each Each stage is only for a part of the workpiece 900.

Referring to FIG. 54 , at least one section of the workpiece 900 in the axial direction is fitted on the outside of each support body 100 in the first state. Then, the support body 100 enters the working state by the movement of the guide mechanism or the support claw, so that the workpiece 900 is in the working state. It is constrained in the radial direction, and at the same time, the positioning protrusion 110 acts to constrain the corresponding grid 902 to realize the shaping of the workpiece 900 and keep each support body 100 in a relatively fixed state, so that the cylindrical structure is stable. Finally, the mold and the workpiece 900 are put into a heat treatment furnace for heat treatment.

In another embodiment of the present application, the workpiece is a radially deformable mesh tubular structure, and includes a plurality of grids 902 surrounded by frame bars 901, and each grid is a hollow grid area 926;

The support body 100 has an axial direction in space, and positioning grooves 110 are distributed on the support body 100. At least a part of the workpiece 900 in the heat treatment state is embedded in the corresponding positioning groove 110, and is constrained by the support body 100 to shape. The area where the positioning grooves 110 are distributed is the working area 120. In the working area 120, other parts except the positioning grooves 110 are relative positioning protrusions 210, and the edge of the positioning protrusions 210 is used as the groove wall of the positioning groove 110;

In the working state, the positioning protrusion 210 is placed into the corresponding grid area 926 , and the frame bars 901 and the grid nodes 925 at the intersection of the frame bars are both placed into the corresponding positioning grooves 110 .

As far as the support itself is concerned, an axially split structure can also be used. In order to limit the top node of the workpiece, a binding piece can also be arranged on the periphery of the support body. There is a latch, and the supporting body is provided with a card slot matching with the latch. Referring to Figures 71 to 78, in one embodiment, the grid node 925 is the intersection of the frame bars, and as the frame bar 901 further extends away from the grid node 925, when it starts to diverge, it can be regarded as leaving The grid nodes 925, generally, the grid nodes 925 can be approximated as a point structure or a line structure.

In this embodiment, the positioning protrusions 210 are arranged in multiple circles along the axial direction of the support body, and the adjacent circles are misplaced. In order to further limit the position, a flexible binding member 140 can also be combined. There is a clamping groove 141 for accommodating the binding piece 140. The binding piece 140 acts on at least the axial ends of the workpiece and the waist with the smallest diameter. Therefore, in addition to the multi-lobed metal ring, there are at least two loops of the clamping groove 141. In this embodiment, except for the positioning protrusion 210a of the top ring, the outer sides of the positioning protrusions 210b of the other rings are all provided with locking grooves 141 , and the positioning protrusions 210a of the top ring are located in the metal ring 143 that is assembled with multiple petals.

In the radial direction of the support body, both the positioning protrusion and the positioning groove have relative height changes. The outer surface of the positioning protrusion can also be regarded as the outer peripheral surface of the support body. In order to limit the grid nodes, along the circumferential direction of the support body, the positioning protrusion The two opposite sides are the positioning side, and the positioning side is an arc surface structure.

During heat treatment, the positioning side and the workpiece are not strictly limited to offset. The radial expansion of the workpiece mainly comes from the support force of the bottom of the positioning groove, but at least the positioning side will offset the inner edge of the grid area on the workpiece when the circumferential correction is required. , the arc surface structure is convenient for dispersing the stress and conforming to the inner edge of the grid area while performing positioning.

Along the radial view of the support body, the positioning side 211 provides at least two constraining points that can act on the workpiece 900 to ensure the constraining effect. At constraint point 928a and constraint point 928b.

The corresponding positioning protrusions in the same grid area of the workpiece are integrated or arranged at multiple intervals, wherein the interval arrangement is arranged at intervals along the axial direction of the support body, and/or arranged at intervals along the circumferential direction of the support body. When they are connected together, the positioning protrusions are circular or elliptical in the radial view of the support body, and can also be truncated circular or elliptical at the position adjacent to the end of the workpiece.

In the figure, there is a card slot 141 horizontally placed in the middle of the positioning protrusion. When the depth of the card slot 141 is close to or equal to the positioning groove 110, it can be regarded as separating the positioning protrusion to form two positioning protrusions arranged at intervals along the axial direction of the support body. rise. With regard to the number of constraint points above, it can be said that the positioning protrusions in the same grid area can be viewed as a whole.

Referring to Fig. 76, taking a circle as an example, its edge can be roughly divided into four areas according to the perimeter, and the positioning side 211 is the area on the left and right sides in the figure, that is, the positioning side 211 (W1) and the positioning side 211 (W2) , along the extending direction of the outer circumference of the positioning protrusion, the span of a single positioning side is 25% of the circumference of the positioning protrusion. Along the supporting axis, the two opposite ends of the positioning protrusion 210 are understood as end points, ie end point P1 and end point P2. In the working state, along the axial direction of the support body, there is a gap 927 between the two opposite ends of the positioning protrusion 210, that is, points P1 and point P2, and the workpiece. Positioning, while releasing the restriction on the mesh node 925 in the axial direction as much as possible, combined with the arc surface structure of the positioning protrusion 210 (corresponding to the circular or elliptical outer contour), it can take into account the orientation of the frame bar 901 and stress release.

Along the circumferential direction of the support body, the grid nodes of the workpiece are placed between two adjacent positioning protrusions. Referring to Figure 77 and Figure 78, if the local parts of the positioning side 211 and the inner edge of the grid area 926 are in good shape, the contact The part is line contact, but considering the compatibility of processing errors and stress release, it may actually be single point or multi-point contact. For example, the contact parts in the figure are point P3 and point P4, and the extension direction point P3 and point The distance between P4 is 15% of the length of the inner edge of the grid area. Since there are two positions on the positioning side 210, the sum is 30% of the length of the inner edge of the grid area 926. The necessary contact span is beneficial to limit the length of the frame bar 901. The extension direction and the shape change near the grid node 925, if there are too few contact parts (such as the traditional pin structure), it will cause cracks at the bifurcation parts of the frame bars, considering the total ratio of the positioning side 211 and the positioning protrusion 210, especially Points P1 and P2 provide good release of the stress of the frame bar, and the span of the contact between the two positioning sides and the inner edge of the grid area generally does not exceed 50% of the length of the inner edge of the grid area.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification. When the technical features in different embodiments are embodied in the same drawing, it can be considered that the drawing also discloses the combination examples of the various embodiments involved.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

A heat treatment mold, characterized in that it includes a support body, the support body has a spatial axial direction, positioning grooves are distributed on the support body, at least a part of the workpiece in the heat treatment state is embedded in the positioning groove corresponding to the position, and Shaped by the constraints of the support body.
The heat treatment mold according to claim 1, characterized in that, the support body is a cylindrical structure as a whole, and the wall thickness of the cylindrical structure is 1-2.5 mm.
The heat treatment mold according to claim 1, characterized in that, the axial partial area of the support body is a double-layer structure, and the workpiece accommodation area is between the double layers; the workpiece accommodation area between the double layers is One side is provided with the positioning groove.
The heat treatment mold according to claim 1, wherein the positioning grooves are distributed in at least one of the following positions:

radially outer side of the support body;

radial inner side of the support body;

Axial end face of the support body.
The heat treatment mold according to claim 1, characterized in that, the workpiece is a radially deformable grid-shaped structure, and includes a plurality of grids surrounded by frame bars, and each grid is a hollow grid district;

The area where the positioning grooves are distributed on the support body is the working area. In the working area, other parts except the positioning grooves are relative positioning protrusions, and the edge parts of the positioning protrusions are used as the positioning grooves. tank wall;

In the working state, the positioning protrusions are placed into the corresponding grid area, and the frame bars and the grid nodes at the intersection of the frame bars are placed into the corresponding positioning grooves.
The heat treatment mold according to claim 5, characterized in that the corresponding positioning protrusions in the same grid area of the workpiece are integrated or arranged at intervals, wherein the interval arrangement is arranged at intervals along the axial direction of the support body, and /or arranged at intervals along the circumferential direction of the support body.
The heat treatment mold according to claim 5, characterized in that, along the circumferential direction of the supporting body, the two opposite sides of the positioning protrusion are positioning sides, and the positioning side provides at least two A constraint point that can be applied to the workpiece.
The heat treatment mold according to claim 5, characterized in that, along the supporting axis, there is a gap between the two opposite ends of the positioning protrusion and the workpiece.
The heat treatment mold according to claim 1, characterized in that, the workpiece is a radially deformable mesh cylinder structure, and includes a plurality of grids surrounded by frame bars, and the depth of the positioning groove is L1, The thickness of the frame strips accommodated by the positioning grooves is L2, which satisfies L1>0.5*L2.
The heat treatment mold according to claim 1, characterized in that there is a recessed avoidance area in the area corresponding to the position of the workpiece on the support body, and when the workpiece and the support body are in a mated state, the workpiece and the There is a preset radial clearance between the avoidance areas.
The heat treatment mold according to claim 10, characterized in that, the workpiece is a radially deformable mesh cylinder structure, and includes a plurality of grids surrounded by frame bars, and the avoidance area corresponds to the grid nodes on the workpiece .
The heat treatment mold according to claim 1, characterized in that the heat treatment mold further comprises a binding member for binding the workpiece to the support body; a groove for positioning the binding member is provided on the outer periphery of the support body.
The heat treatment mold according to claim 12, characterized in that, the area where positioning grooves are distributed on the support body is a working area, and the working area has one or more radial turning parts, and the locking grooves The position corresponds to each radial turning point.
The heat treatment mold according to claim 1, wherein a chute is opened on the support body, and the heat treatment mold further includes an adjustment member movably fitted in the chute, and the adjustment member is used to abut against The corresponding part of the workpiece;

There are multiple sliding grooves distributed along the circumference of the supporting body, and the adjusting member is rod-shaped, one end of which extends into the corresponding sliding groove, and the other end extends toward the central area inside the supporting body.
The heat treatment mold according to claim 14, characterized in that, the heat treatment mold further comprises a pulling member acting on the adjusting member to drive the adjusting member to move along the sliding groove.
The heat treatment mold according to claim 14, wherein the support body has opposite top and bottom sides in the axial direction, and the chute comprises:

a first chute, one end of the first chute is open towards the top side of the support body;

A second sliding slot, one end of the second sliding slot is open toward the bottom side of the support body.
The heat treatment mold according to claim 1, wherein the support body comprises one or more ring parts, and the outer circumference and/or inner edge of each ring part is provided with the positioning groove.
The heat treatment mold according to claim 17, characterized in that, along the axial direction of the support body, the width of the annular member is less than or equal to the size of one grid at the corresponding position of the workpiece.
The heat treatment mold of claim 17, wherein said annular member comprises at least one of the following types:

Inner ring, the positioning grooves are distributed on the outer circumference of the inner ring, at least a part of the workpiece in the heat treatment state is sleeved on the outer circumference of the inner ring;

In the outer ring, the positioning grooves are distributed on the inner edge of the outer ring, and at least a part of the workpiece in a heat treatment state is located on the inner periphery of the outer ring.
The heat treatment mold according to claim 17, characterized in that, the heat treatment mold further comprises a core rod, and all the ring parts are fixedly or movably sleeved on the core rod.
The heat treatment mold according to claim 20, wherein the annular member is slidably sleeved on the core rod, and a guiding structure cooperating with each other is provided between the annular member and the core rod; the guiding structure comprises:

a guide groove disposed on one of the core rod or the ring;

The guide strip is arranged on the other one of the core rod or the ring, and cooperates with the guide groove.
The heat treatment mold according to claim 1, characterized in that, the support body has an integral structure in the axial direction or a split structure comprising a plurality of unit segments; among the plurality of unit segments, only some of the unit segments are provided with The positioning groove, or all the unit segments are provided with the positioning groove.
The heat treatment mold according to claim 22, wherein two adjacent unit segments are spliced at the radial turning portion of the support body.
The heat treatment mold according to any one of claims 1-23, characterized in that, the support body is formed by 3D printing.
A workpiece heat treatment method, comprising a heat treatment mold and a workpiece, characterized in that the heat treatment mold includes a support body, the support body has an axial direction in space, and positioning grooves are distributed on the support body; the workpiece is a mesh a cylindrical structure having a first shape before heat treatment and a second shape after heat treatment;

The workpiece heat treatment method includes embedding at least a part of the workpiece having a first shape into a positioning groove corresponding to the position, so that the workpiece is constrained to be shaped by the support body;

performing heat treatment on the workpiece and the heat treatment mold to obtain a workpiece having a second shape.