Precise assembly process method for threading nut

Abstract

The invention provides a precise assembly process method for a threading nut. The precise assembly process method comprises the following steps that S1, the original form of a stainless steel wire is confirmed; s2, confirming the specification of the stainless steel wire, selecting the diameter of the stainless steel wire according to the specification of the stainless steel wire, confirming the blanking length of the stainless steel wire, and then blanking on a stainless steel wire stamping blanking die to obtain the stainless steel wire with the required length; s3, a stainless steel wire end chamfering bench work procedure is carried out; s4, a stainless steel wire press-fitting tool is selected according to the specification of the steel wire, and the press-fitting process of the stainless steel wire is conducted; s5, a quality inspection procedure after stainless steel wire assembly: after assembly is completed, measuring the size from the end face of the penetrating steel wire to the side face of the steel wire penetrating nut part by using a caliper to obtain the assembly distance of the stainless steel wire; using a plug gauge to measure an assembly clearance; and the rotation flexibility of the nut is confirmed. Good operability, high production efficiency, high quality consistency and high nut rotation flexibility in the threading nut assembly process can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline connection, and in particular to a precise assembly process method for a threading nut. Background Art

[0002] Existing assembly methods between pipe joints and nuts include outer sleeve nut assembly, tightening nut assembly, locking nut assembly and threading nut assembly. The assembly of outer sleeve nut has installation space limitations, and radial matching installation space needs to be ensured during use; tightening nut requires the use of special tightening machine equipment, which is usually used for the assembly of stainless steel nuts and is not suitable for titanium alloy materials; the assembly of locking nut usually requires double nut matching installation, which increases the weight; the assembly method of threading nut is suitable for scenes with limited installation space and high self-locking requirements, and wire nut also has the advantage of weight reduction, but the existing assembly method of threading nut has the problems of poor operability and low production efficiency. At the same time, there is also the risk of low quality consistency and poor rotation flexibility after wire assembly. Summary of the invention

[0003] In response to the technical problems raised above, a precise assembly process method for a threaded nut is provided.

[0004] The technical means adopted by the present invention are as follows:

[0005] A precise assembly process for a threading nut comprises the following steps:

[0006] S1. Confirm the original shape of the stainless steel wire;

[0007] S2. Confirm the specifications of the stainless steel wire, select the wire diameter according to the specifications of the stainless steel wire, confirm the blanking length of the stainless steel wire, and then blank the wire on the stainless steel wire stamping blanking die to obtain the stainless steel wire of the required length;

[0008] S3, chamfering the stainless steel wire end: select the chamfering cutter and chamfering clamp tooling according to the stainless steel wire specifications, and chamfer the stainless steel wire end;

[0009] S4. Select a stainless steel wire pressing tool according to the steel wire specification, and perform the pressing process of the stainless steel wire, including the fixed installation of the steel wire nut part, the installation of the nozzle end part and the installation of the stainless steel wire part. The steel wire nut part and the nozzle end part are assembled and connected by the stainless steel wire part. After assembly, the stainless steel wire part is located in the steel wire hole of the steel wire nut part, and there is an assembly gap between the stainless steel wire part and the nozzle end part.

[0010] S5. Quality inspection process after stainless steel wire assembly: After assembly is completed, use a caliper to measure the size from the end face of the inserted steel wire to the side of the wire nut part to obtain the stainless steel wire assembly distance; use a plug gauge to measure the assembly gap; and confirm the rotation flexibility of the nut.

[0011] Furthermore, in step S1, the shape of the raw material of the stainless steel wire includes a wire rod shape and a straight bar shape. When the original shape of the stainless steel wire is a straight bar shape, step S2 is directly performed; when the original shape of the stainless steel wire is a wire rod shape, the wire rod-shaped stainless steel wire is firstly straightened, and then step S2 is performed;

[0012] The straightening process of the coiled stainless steel wire is realized by the straightening tool, and the straightness of the coiled stainless steel wire after the straightening process reaches the technical requirement of ≤0.03mm.

[0013] Further, the straightening tool comprises two parts, the left part comprises a handle I, 7 rollers I and 3 screws I installed on the tool body, the 7 rollers I are arranged in two rows, the upper row is provided with 3 rollers I, and the lower row is provided with 4 rollers I; the screws I are arranged above the upper row rollers I, and the handle I is arranged below the lower row rollers I; the right part comprises a handle II, 7 rollers II and 3 screws II installed on the tool body, the 7 rollers II are arranged in two rows horizontally, the front row is provided with 3 rollers II, and the rear row is provided with 4 rollers II; the screws II are arranged below the front side of the front row rollers II, and the handle II is arranged behind the rear row rollers II; the screws I and screws II are used to fix rollers I and II, respectively;

[0014] The left half completes the wire correction in three directions of XYZ, and the X direction is the direction of wire movement; the right half completes the wire correction in two directions of XY, and the X direction is the direction of wire movement;

[0015] By fixing the wire straightening tool on the mounting table, the stainless steel wire is installed in the wire groove between rollers I along the X direction, and the right handle I is first turned to drive the rotation of roller I. The stainless steel wire moves along the direction X under the action of the friction force of roller I, thereby realizing the correction of the wire in the XY directions; then the left handle II is turned to drive the rotation of roller II. The stainless steel wire moves along the X direction under the action of the friction force of roller II, thereby realizing the correction of the wire in the XYZ directions.

[0016] Furthermore, in step S2, the specifications of the stainless steel wire include five specifications of φ2.0, φ2.5, φ3.0, φ3.5 and φ4.0;

[0017] The stainless steel wire part tightly assembled in the stainless steel wire nut part 130 consists of a straight segment structure at the entry end and an arc segment structure integrated with the straight segment structure. The length of the straight segment structure is L, the center line arc length corresponding to the arc segment structure is S, and the total cutting length of the stainless steel wire is L+S.

[0018] Further, the stamping blanking die comprises an upper die fixing seat, a die insert and a lower die fixing seat, the die insert being arranged between the upper die fixing seat and the lower die fixing seat, wherein the die insert comprises an upper insert installed on the upper die fixing seat and a steel wire fixing movable block, a fixed insert, a steel wire positioning insert, a lower insert, a steel wire positioning block and a stainless steel wire axial position adjustment insert installed on the lower die fixing seat, the upper insert corresponds to the lower insert up and down, the steel wire fixing movable block is installed on the upper insert, the lower insert is arranged between the fixed insert and the steel wire positioning block, the stainless steel wire axial position adjustment insert is located on the right side of the steel wire positioning block, a plurality of steel wire positioning inserts are provided and are installed on the fixed insert at intervals, the number of the steel wire positioning inserts is consistent with the number of stainless steel wire parts, a plurality of R grooves are provided on the steel wire fixing movable block, a plurality of slots are provided on the steel wire positioning block, and a plurality of U-shaped grooves are provided on the stainless steel wire axial position adjustment insert;

[0019] After calculating the required length for blanking, the stainless steel wire is passed through the steel wire positioning insert of the corresponding specification, and the position of the stainless steel wire part in the mold is adjusted by adjusting the axial position adjustment insert of the stainless steel wire. The length of the stainless steel wire placed in the stamping blanking mold is determined, and the steel wire is clamped by the steel wire fixing movable blocks in the lower insert and the upper insert. The steel wire blanking process is completed under the action of the punching knife to obtain the stainless steel wire of the required length.

[0020] Furthermore, the specific steps of step S3 are as follows: select the corresponding wire chamfering clamp and chamfering cutter according to the specifications of the stainless steel wire, design the chamfering cutter and the wire clamp to match the equipment interface, and perform the chamfering process of the stainless steel wire end on the CNC chamfering machine to ensure that the end of the stainless steel wire is free of burrs, obtain a smooth rounded end, and reduce the friction resistance during the assembly process of the stainless steel wire; the end chamfer of the stainless steel wire is a rounded structure of not less than 0.5 mm.

[0021] Furthermore, in step S4, a corresponding stainless steel wire pressing tool is selected according to the wire nut part, the wire nut part is first placed in the positioning installation groove of the pressing tool, and then the part with the nozzle end is placed on the positioning cylinder of the rotating table of the pressing tool. The stainless steel wire positioning hole is exposed by rotating the rotating table body of the pressing tool to a predetermined angle, and the stainless steel wire part is placed in the stainless steel wire positioning hole, and the cylinder movement stroke of the pressing tool is adjusted, the cylinder movement stroke is equal to the movement stroke of the stainless steel wire assembly process, the cylinder is connected to a high-pressure gas source, the gas source pressure is set to 0.2-0.5MPa, the gas source switch is turned on, and the stainless steel wire is pressed.

[0022] Further, the press-fitting tool comprises a fixed base structure, a rotating table structure, a power unit and a plurality of lifting ear structures, wherein the plurality of lifting ear structures are distributed at the four corners of the fixed base structure, the fixed base structure comprises a stainless steel plate and a stainless steel annular fixing seat, the stainless steel annular fixing seat is fixed to the stainless steel plate by a plurality of bolts, the rotating table structure is connected to the stainless steel annular fixing seat, and the power unit is mounted on the stainless steel plate;

[0023] The power unit includes a pressure source cylinder, a stainless steel ejector mechanism and a stainless steel ejector pin. The pressure source cylinder is connected to an external pressure source. The stainless steel ejector mechanism is connected to the pressure source cylinder on one side through a threaded structure and is connected to the stainless steel ejector pin on the other side through a screw.

[0024] Further, the rotating table structure includes a nut fixing clamping mechanism, an end positioning cylinder, and a stainless steel wire guide mechanism, a rotating disk mechanism and a reset mechanism installed on a stainless steel annular fixing seat, wherein the nut fixing clamping mechanism and the end positioning cylinder are installed on the rotating disk mechanism, the rotating disk mechanism is rotatably connected to the stainless steel annular fixing seat, and the stainless steel wire guide mechanism and the reset mechanism are located on both sides of the rotating disk mechanism;

[0025] During the press-fitting process, the nozzle end part and the end positioning cylinder cooperate with each other through the cylinder to realize the assembly positioning of the large nozzle part; the wire nut part is placed in the rectangular groove of the rotating disk mechanism, and the position of the wire nut part in the rectangular groove is adjusted by rotating the screw of the nut clamping mechanism. The stainless steel wire guide mechanism is processed with a through-hole structure for the stainless steel wire part to pass through, which is used for guiding the steel wire and the stainless steel wire ejector pin during the forming process of the stainless steel wire part; a rotating handle is installed on the rotating disk mechanism, and a reset spring is installed on the reset mechanism to realize the reset of the rotating disk mechanism; after each wire press-fitting process is completed, the rotating disk mechanism is rotated to the angle of the reset mechanism limit by rotating the rotating handle, and the stainless steel wire part is installed for the next time, and the stainless steel wire part is placed in the wire hole of the rotating disk mechanism. Under the action of the reset spring, the rotating disk mechanism is restored to the initial position, and the external air source is connected. The pressure source cylinder starts to work under the action of the external air pressure source. When the pressure source cylinder works, it drives the stainless steel ejector mechanism to move axially, and the stainless steel ejector mechanism drives the stainless steel ejector pin to move axially to realize the assembly process.

[0026] Furthermore, in step S5, after the assembly is completed, ensure that the outer end surface of the stainless steel wire part is completely immersed in the wire hole of the wire nut part, and control the depth to be 0.5 to 1 mm below the outer surface of the wire nut part. Use a plug gauge for indirect measurement to ensure that the assembly position of the stainless steel wire meets the requirements; the assembly gap is controlled between 0.1 and 0.3 mm.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The present invention provides a wire nut assembly process method, which is suitable for stainless steel wires in disc and straight strip states originally supplied, and is not affected by the supply state of the wires.

[0029] 2. In the present invention, the cutting length of the steel wire is determined by simulation calculation, which can accurately confirm the initial cutting length of the steel wire, greatly ensuring the utilization rate of the steel wire material. The steel wire cutting process of punching and cutting is adopted during cutting, and the processing efficiency and processing accuracy are greatly improved compared with the laser cutting process, which greatly improves the processing efficiency.

[0030] 3. The present invention designs a semi-automatic special steel wire pressing tool with high control accuracy and good consistency of the assembly process. It is suitable for factory batch production and greatly improves assembly efficiency.

[0031] 4. The threading nut wire assembly process of the present invention uses 4 sets of auxiliary tooling and 2 sets of special inspection tools, which can achieve good operability, high production efficiency, quality consistency and nut rotation flexibility in the threading nut assembly process.

[0032] 5. The four sets of auxiliary tooling of the present invention are respectively a wire straightening tooling, a wire cutting tooling, a wire chamfering cutter tooling and a wire threading assembly tooling. Threading nuts of different specifications correspond to the above four sets of tooling, respectively, avoiding the operation of parts replacement when using universal tooling, ensuring the sustainability of the production rhythm during wire assembly, improving production efficiency, and ensuring good operability of the assembly process.

[0033] 6. After the stainless steel wire is assembled, use a special plug gauge to measure the sinking distance of the stainless steel wire in the wire hole of the threading nut, and use a special needle gauge to measure the active gap between the stainless steel wire and the nozzle joint to ensure that the assembly can rotate flexibly.

[0034] Based on the above reasons, the present invention can be widely promoted in the fields of threading nut assembly and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0036] Figure 1 This is a schematic diagram of the assembly principle of the wire nut of the present invention.

[0037] Figure 2 The present invention is a flowchart of the wire nut assembly process.

[0038] Figure 3 It is a schematic diagram of the stainless steel wire straightening tool of the present invention.

[0039] Figure 4 This is a calculation diagram for the cutting length of stainless steel wire according to the present invention.

[0040] Figure 5 It is a schematic diagram of the straight line segment structure and the arc segment structure of the stainless steel wire of the present invention.

[0041] Figure 6 This is a diagram of the stainless steel wire stamping die of the present invention.

[0042] Figure 7 The present invention is a stainless steel wire stamping blanking die block diagram, wherein (a) is an axonometric view and (b) is a side view.

[0043] Figure 8 This is a drawing of the stainless steel wire pressing tooling of the present invention, wherein (a) is a front view and (b) is a top view.

[0044] Fig. 9Schematic diagram of the structure of the turntable, where (a) is an axonometric view and (b) is a top view.

[0045] Fig.10 It is a structural schematic diagram of the rotating disk mechanism.

[0046] Fig.11 This is a schematic diagram of the wire assembly position measurement.

[0047] In the figure: 100, assembly component; 110, nozzle end part; 120, stainless steel wire part; 130, wire nut part; 140, assembly gap;

[0048] 121. Straight line segment structure; 122. Arc line segment structure;

[0049] 200. Overall process route; 220. Cutting process; 210. Straightening process; 220. Confirmation of stainless steel wire specifications and cutting length process; 230. Chamfering of stainless steel wire ends; 240. Pressing of stainless steel wire; 250. Post-assembly quality inspection process;

[0050] 300, straightening tool; 310, handle Ⅰ; 320, roller Ⅰ; 330, screw Ⅰ; 340, handle Ⅱ; 350, roller Ⅱ; 360, screw Ⅱ;

[0051] 400, assembly component location;

[0052] 500, stamping blanking die; 510, upper die fixing seat; 520, die insert; 530, lower die fixing seat; 521, upper insert; 522, fixed insert; 523, lower insert; 524, steel wire positioning block; 525, stainless steel wire axial position adjustment insert; 526, steel wire fixing movable block; 527, steel wire positioning insert;

[0053] 600, press-fitting tool; 610, fixed base structure; 620, turntable structure; 630, power unit; 640, lifting ear structure; 611, stainless steel plate; 612, stainless steel annular fixing seat; 621, nut fixing clamping mechanism; 622, end positioning cylinder; 623, stainless steel wire guide mechanism; 624, rotating disk mechanism; 625, reset mechanism; 631, pressure source cylinder; 632, stainless steel ejector rod mechanism; 633, stainless steel ejector pin;. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0061] like Figure 1 The figure shows a schematic diagram of the assembly structure of the wire nut. The wire nut assembly component 100 includes a wire nut part 130, a stainless steel wire part 120 and a nozzle end part 110, wherein the wire nut part 130 and the nozzle end part 110 are clearance-matched, the inner hole of the wire nut part 130 has a circular groove structure, which is clearance-matched with the stainless steel wire part 120, the nozzle end part 110 has an arc structure feature, which is clearance-matched with the stainless steel wire part 120, the wire nut part 130 and the nozzle end part 110 are assembled and connected by the stainless steel wire part 120 to ensure the axial connection strength of the assembly component 100 after assembly. After assembly, the stainless steel wire part 120 is located in the circular groove structure (wire hole) of the wire nut part 130, and there is a certain assembly gap 140 between the stainless steel wire part 120 and the nozzle end part 110, and the assembly gap 140 is usually controlled between 0.1 and 0.3 mm to ensure the flexibility of rotation.

[0062] The present invention provides a precise assembly process method for threading nuts. The threading nut wire assembly process uses 4 sets of auxiliary tooling and 2 sets of special inspection tools, which can achieve good operability, high production efficiency, quality consistency and nut rotation flexibility in the threading nut assembly process. The 4 sets of auxiliary tooling are respectively a wire straightening tooling, a wire cutting tooling, a wire chamfering cutter tooling and a threading wire assembly tooling. Threading nuts of different specifications correspond to the above 4 sets of tooling, respectively, avoiding the operation of replacing parts when using general tooling, ensuring the sustainability of the production rhythm during wire assembly, improving production efficiency, and ensuring good operability of the assembly process. The stainless steel wire undergoes elastic-plastic deformation during the assembly process, and expands and tightens in the inner hole groove of the threading nut due to the action of the rebound force. The axial displacement of the stainless steel wire is guaranteed by the tooling stroke. After the stainless steel wire is assembled, the sinking distance of the stainless steel wire in the threading nut wire hole is measured by a special plug gauge, and the movable gap between the stainless steel wire and the nozzle joint is measured by a special pin gauge to ensure that the assembly can rotate flexibly.

[0063] like Figure 2 The figure shows the process flow chart of the wire nut assembly process. The overall process route 200 is divided into 5 steps, including:

[0064] 1) The first step is to determine the shape of the stainless steel wire: confirm the original shape of the stainless steel wire and perform the stainless steel wire straightening process. The shapes of the stainless steel wire raw materials are divided into two types: coil and straight strip. The specific process route is formulated according to the original shape of the stainless steel wire. If the original shape of the stainless steel wire is a straight strip, the blanking process 220 is directly carried out. If the original shape of the stainless steel wire is a coil, the coil-shaped stainless steel wire needs to be straightened 210 first. The straightening process 210 of the coil-shaped stainless steel wire uses a special straightening tool 300 (straightening tool). The straightness of the coil-shaped stainless steel wire after the straightening process 210 reaches the technical requirement of ≤0.03mm.

[0065] 2) The second step is to confirm the specifications and cutting length of the stainless steel wire in process 220. According to the specifications and assembly requirements of the threading nut, the corresponding specifications of the stainless steel wire are selected. The specifications of the stainless steel wire include five specifications: φ2.0, φ2.5, φ3.0, φ3.5 and φ4.0. Then, the cutting length of the stainless steel wire is calculated, and the cutting is performed on a special stainless steel wire stamping and cutting die 500 to obtain the stainless steel wire of the required length.

[0066] 3) The third step is the stainless steel wire end chamfering bench work process 230. According to the specifications of the stainless steel wire, the corresponding wire chamfering clamp tooling and chamfering cutter disc are selected. The chamfering cutter disc and the wire clamp tooling are matched according to the equipment interface. The chamfering process of the stainless steel wire end is carried out on the CNC chamfering machine to ensure that the end of the stainless steel wire is free of burrs and has smooth rounded ends, reduce the friction resistance during the assembly process of the stainless steel wire, and the end chamfer of the stainless steel wire is usually a rounded structure of not less than 0.5mm.

[0067] 4) The fourth step is the stainless steel wire pressing process 240. According to the steel wire specifications, the steel wire assembly tool is selected, and the cylinder stroke is adjusted and the pressure is set to perform the press-fit steel wire assembly, including the fixed installation of the nut, the installation of the nozzle end and the installation of the stainless steel wire: according to the steel wire nut part 130, the corresponding stainless steel wire pressing tool 600 is selected, and the steel wire nut part 130 is first placed in the positioning installation groove of the pressing tool 600, and then the part with the nozzle end 110 is placed on the positioning cylinder of the rotating table of the pressing tool 600. The steel wire positioning hole is exposed by rotating the rotating table body of the pressing tool 600 to a predetermined angle, and the stainless steel wire part 120 is placed in the positioning hole, and the cylinder movement stroke of the pressing tool 600 is adjusted. The cylinder movement stroke needs to be equal to the movement stroke of the stainless steel wire assembly process, and a high-pressure gas source is connected. Generally, the gas source pressure is set to 0.2-0.5Mpa (it can be set to 0.3Mpa in this embodiment), and the gas source switch is turned on to press the stainless steel wire.

[0068] 5) The fifth step is the post-assembly quality inspection process 250. After the wire nut assembly component 100 is assembled, it is necessary to ensure that the outer end surface of the stainless steel wire part 120 is completely immersed in the wire hole of the wire nut part 130. Generally, the depth is controlled to be about 0.5 to 1 mm lower than the outer surface of the wire nut part 130. A plug gauge is used for indirect measurement to ensure that the stainless steel wire assembly position meets the requirements. At the same time, in order to ensure the rotation flexibility of the stainless steel wire assembly component 100 product after assembly, it is necessary to measure the assembly gap 140. A plug needle is used to perform indirect measurement of the assembly gap 140 to ensure that the component meets the functional requirements of free rotation.

[0069] like Figure 3The figure shows the structure of the straightening tool for stainless steel wire. The straightening tool 300 includes a handle Ⅰ310, a handle Ⅱ340, 14 rollers (7 rollers on each side, i.e., 7 rollers Ⅰ320 and 7 rollers Ⅱ350) and 6 screws (3 screws on each side, i.e., 3 screws Ⅰ330 and 3 screws Ⅱ360) installed on the tool body. The straightening tool 300 straightens the stainless steel wire with a specification of φ2.0 to φ4.0 by tightening and loosening the handle Ⅰ310 and the handle Ⅱ340. The straightening tool 300 is equipped with 14 rollers in total. The stainless steel wire is inserted between the rollers and fine-tuned by adjusting the screws to achieve the straightening of the stainless steel wire. Specifically, the straightening tool is a universal structural tooling, which is divided into a left part and a right part. The structures of the two parts are completely similar. The left part includes a handle Ⅰ310, 7 rollers Ⅰ320 and 3 screws Ⅰ330. The 7 rollers Ⅰ320 are arranged in two rows, the upper row is provided with 3 rollers Ⅰ320, and the lower row is provided with 4 rollers Ⅰ320; the screws Ⅰ330 are arranged above the upper row rollers Ⅰ320, and the handle Ⅰ310 is arranged below the lower row rollers Ⅰ320; The right half includes handle Ⅱ340, 7 rollers Ⅱ350 and 3 screws Ⅱ360. The 7 rollers Ⅱ350 are arranged in two horizontal rows, 3 rollers Ⅱ350 are arranged in the front row, and 4 rollers Ⅱ350 are arranged in the back row. The screws Ⅱ360 are arranged at the front and lower sides of the front rollers Ⅱ350, and the handle Ⅱ340 is arranged at the rear of the rear rollers Ⅱ350. The screws Ⅰ330 and Ⅱ360 are used to fix the rollers Ⅰ320 and Ⅱ350 respectively. The left half completes the wire correction in three directions of XYZ (the X direction is the direction of wire movement), and the right half completes the wire correction in two directions of XY (the X direction is the direction of wire movement). By fixing the steel wire straightening tool 300 on the mounting table, the stainless steel wire is installed in the steel wire groove between the rollers Ⅰ320 along the X direction, firstly the right handle Ⅰ310 is turned to drive the rotation of the roller Ⅰ320, and the stainless steel wire moves along the direction X under the action of the friction force of the roller Ⅰ320, thereby realizing the correction of the steel wire in the XY directions, and further, the left handle Ⅱ340 is turned to drive the rotation of the roller Ⅱ350, and the stainless steel wire moves along the X direction under the action of the friction force of the roller Ⅱ350, thereby realizing the correction of the steel wire in the XYZ directions.

[0070] like Figure 4-5 The figure shows a schematic diagram of a method for calculating the blanking length of stainless steel wire. The stainless steel wire part 120 is at the assembly assembly position 400 in the wire nut part 130. The stainless steel wire part 120 undergoes elastic-plastic deformation during the press-fitting process. Due to the resilience after deformation, it forms a tight fit with the stainless steel wire nut part 130. The stainless steel wire part 120 is structurally divided into a straight segment structure 121 at the entry end and an arc segment structure 122. The length of the straight segment structure 121 is L, and the centerline arc length corresponding to the arc segment structure 122 is S. The total blanking length of the stainless steel wire should be (L+S).

[0071] Figure 6 Schematic diagram of a stainless steel wire stamping blanking die 500. The stainless steel wire stamping blanking die 500 comprises an upper die fixing seat 510, a die insert 520 and a lower die fixing seat 530, wherein the die insert 520 is disposed between the upper die fixing seat 510 and the lower die fixing seat 530.

[0072] Figure 7 Schematic diagram of mold insert 520. Mold insert 520 includes upper insert 521 installed on upper mold fixing seat 510, and steel wire fixed movable block 526, fixed insert 522, steel wire positioning insert 527, lower insert 523, steel wire positioning block 524 and stainless steel wire axial position adjustment insert 525 installed on lower mold fixing seat 530. Upper insert 521 corresponds to lower insert 523 up and down. Steel wire fixed movable block 526 is installed on upper insert 521. Lower insert 523 is arranged between fixed insert 522 and steel wire positioning block 524. Stainless steel wire axial position adjustment insert 525 is located on the right side of steel wire positioning block 524. Steel wire positioning insert 523 is arranged between fixed insert 522 and steel wire positioning block 524. 27 is provided with multiple and spaced installations on the fixed insert 522, the steel wire fixed movable block 526 is provided with multiple R grooves, the steel wire positioning block 524 is provided with multiple slots, and the stainless steel wire axial position adjustment insert 525 is provided with multiple U-shaped grooves; the number of steel wire positioning inserts 527 is consistent with the number of stainless steel wire parts, and can be adjusted according to the actual steel wire specifications. When the number of stainless steel wire specifications is adjusted, the number of steel wire positioning inserts 527 is adjusted accordingly, and the number of R grooves of the steel wire fixed movable block 526, the number of slots of the steel wire positioning block 524 and the number of U-shaped grooves of the stainless steel wire axial position adjustment insert 525 are adjusted at the same time. Figure 4 After calculating the required length for blanking by the method introduced, the stainless steel wire is passed through the steel wire positioning insert 527 of the corresponding specification, and the position of the stainless steel wire part 120 in the mold is adjusted by adjusting the axial position adjustment insert 525 of the stainless steel wire to determine the length of the stainless steel wire placed in the stamping blanking die 500. The steel wire is clamped by the steel wire fixing movable block 526 in the lower insert 523 and the upper insert 521, and the steel wire blanking process is completed under the action of the punching knife to obtain the stainless steel wire of the required length.

[0073] Figure 8Schematic diagram of stainless steel wire pressing tool 600. Stainless steel wire pressing tool 600 can be divided into four parts according to function, namely fixed base structure 610, rotating table structure 620, power unit 630 and ear structure 640. Fixed base structure 610 includes stainless steel plate 611 and stainless steel annular fixed seat 612. Stainless steel annular fixed seat 612 is fixed on stainless steel plate 611 by 4 bolts, which mainly plays a fixing role to ensure that the wire pressing process will not overturn. Rotating table structure 620 is connected to stainless steel annular fixed seat 612, and power unit 630 is installed on stainless steel plate 611. Power unit 630 includes pressure source cylinder 631, stainless steel ejector mechanism 632 and stainless steel ejector pin 633 installed on stainless steel plate 611. Pressure source cylinder 631 is connected to an external pressure source. One side of stainless steel ejector mechanism 632 is connected to pressure source cylinder 631 by a threaded structure, and the other side of stainless steel ejector mechanism 632 is connected to stainless steel ejector pin 633 by a screw. There are four lifting ear structures 640 , which are evenly distributed at the four corners of the fixing seat structure 610 , so as to ensure the convenience of movement during the transportation of the tooling.

[0074] Fig. 9 The figure shows a schematic diagram of the structure of the rotating table structure 620. The rotating table structure 620 can be divided into a nut fixing clamping mechanism 621, an end positioning cylinder 622, a stainless steel wire guide mechanism 623 installed on the stainless steel annular fixing seat 612, a rotating disk mechanism 624 and a reset mechanism 625. The nut fixing clamping mechanism 621 and the end positioning cylinder 622 are installed on the rotating disk mechanism 624, the rotating disk mechanism 624 is rotatably connected to the stainless steel annular fixing seat 612, and the stainless steel wire guide mechanism 623 and the reset mechanism 625 are located on both sides of the rotating disk mechanism 624. The nozzle end part 110 and the end positioning cylinder 622 are matched with each other through the cylinder to realize the assembly and positioning of the large nozzle part. The wire nut part 130 is placed in the rectangular groove of the rotating disk mechanism 624, and the position of the nut part 130 in the rectangular groove is adjusted by rotating the screw of the nut clamping mechanism 621. The stainless steel wire guide mechanism 623 is processed with a through hole structure feature for the stainless steel wire part 120 to pass through, which is used for guiding the steel wire and the stainless steel wire ejector pin 633 structure during the forming process of the stainless steel wire part 120. A rotating handle is installed on the rotating disk mechanism 624. After each wire pressing process is completed, the handle is rotated to the limit angle of the reset mechanism 625 to install the stainless steel wire part 120 next time. The reset mechanism 625 is installed with a spring structure to realize the reset of the rotating disk mechanism 624.

[0075] Fig.10The figure shows a schematic diagram of the structure of the rotating disk mechanism 624. During the press-fitting process, the nozzle end part 110 is first placed on the positioning cylinder of the end positioning cylinder 622, and the wire nut part 130 is placed in the rectangular groove of the rotating disk mechanism 624. The position of the nut part 130 in the rectangular groove is adjusted by rotating the screw of the nut clamping mechanism 621, and then the rotating disk mechanism 624 is rotated to the angle limited by the reset mechanism 625 by rotating the rotating handle installed on the rotating disk mechanism 624, and then the stainless steel wire part 120 is placed in the wire hole of the rotating disk mechanism 624. Under the action of the reset spring, the rotating disk mechanism 624 is restored to the initial position, and the external air source is connected. The pressure source cylinder 631 starts to work under the action of the external air pressure source. When the pressure source cylinder 631 works, it drives the stainless steel ejector mechanism 632 to move axially, and the stainless steel ejector mechanism 632 pushes the stainless steel ejector pin 633 to move axially, thereby realizing the assembly process.

[0076] Use a caliper (plug gauge) to measure the distance from the end face of the inserted steel wire to the side of the threading nut to obtain the stainless steel wire assembly distance, see Fig.11 ; Use a plug gauge to press Figure 1 As shown, the assembly gap 140 is measured; and the nut rotation flexibility is confirmed.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A precise assembly process for threading nuts, characterized in that: The steps include: S1. Confirm the original shape of the stainless steel wire; S2, confirming the specifications of the stainless steel wire, selecting the diameter of the steel wire according to the specifications of the stainless steel wire, confirming the blanking length of the stainless steel wire, and then blanking the stainless steel wire on the stainless steel wire stamping blanking die (500) to obtain the stainless steel wire of the required length; S3, chamfering the stainless steel wire end: select the chamfering cutter and chamfering clamp tooling according to the stainless steel wire specifications, and chamfer the stainless steel wire end; S4, selecting a stainless steel wire pressing tool (600) according to the steel wire specification, and performing a stainless steel wire pressing process, including fixing and installing the steel wire nut part (130), installing the nozzle end part (110) and installing the stainless steel wire part (120), the steel wire nut part (130) and the nozzle end part (110) are assembled and connected via the stainless steel wire part (120), after which the stainless steel wire part (120) is located in the steel wire hole of the steel wire nut part (130), and an assembly gap (140) exists between the stainless steel wire part (120) and the nozzle end part (110); S5. Quality inspection process after stainless steel wire assembly: After assembly is completed, use a caliper to measure the size from the end face of the inserted steel wire to the side of the wire nut part (130) to obtain the stainless steel wire assembly distance; use a plug gauge to measure the assembly gap (140); and confirm the rotation flexibility of the nut.

2. The precise assembly process of the threading nut according to claim 1, characterized in that: In the step S1, the shape of the raw material of the stainless steel wire includes a wire rod shape and a straight bar shape. When the original shape of the stainless steel wire is a straight bar shape, the step S2 is directly performed; when the original shape of the stainless steel wire is a wire rod shape, the wire rod-shaped stainless steel wire is firstly straightened, and then the step S2 is performed; The straightening process of the coil-shaped stainless steel wire is realized by the straightening tool (300), and the straightness of the coil-shaped stainless steel wire after the straightening process reaches the technical requirement of ≤0.03 mm.

3. The precise assembly process of the threading nut according to claim 2, characterized in that: The straightening tool (300) comprises two parts, the left part comprises a handle I (310), seven rollers I (320) and three screws I (330) mounted on the tool body, the seven rollers I (320) are arranged in two rows, the upper row comprises three rollers I (320) and the lower row comprises four rollers I (320); the screws I (330) are arranged above the upper row rollers I (320), and the handle I (310) is arranged below the lower row rollers I (320); the right part comprises a handle I (310) mounted on the tool body A handle II (340), seven rollers II (350) and three screws II (360), wherein the seven rollers II (350) are arranged in two horizontal rows, three rollers II (350) are arranged in the front row, and four rollers II (350) are arranged in the rear row; the screws II (360) are arranged at the lower front side of the front rollers II (350), and the handle II (340) is arranged at the rear of the rear rollers II (350); the screws I (330) and screws II (360) are used to fix the rollers I (320) and rollers II (350) respectively; The left half completes the wire correction in three directions of XYZ, and the X direction is the direction of wire movement; the right half completes the wire correction in two directions of XY, and the X direction is the direction of wire movement; The steel wire straightening tool (300) is fixed on a mounting table, and the stainless steel wire is installed in the steel wire groove between the rollers I (320) along the X direction. The right handle I (310) is firstly rotated to drive the rotation of the roller I (320), and the stainless steel wire moves along the direction X under the action of the friction force of the roller I (320), thereby realizing the correction of the steel wire in the X and Y directions; then the left handle II (340) is rotated to drive the rotation of the roller II (350), and the stainless steel wire moves along the X direction under the action of the friction force of the roller II (350), thereby realizing the correction of the steel wire in the X, Y and Z directions.

4. The precise assembly process of the threading nut according to claim 1, characterized in that: In step S2, the specifications of the stainless steel wire include five specifications: φ2.0, φ2.5, φ3.0, φ3.5 and φ4.0; The stainless steel wire part (120) tightly assembled in the stainless steel wire nut part 130 is composed of a straight segment structure (121) at the head end and an arc segment structure (122) integrated with the straight segment structure (121), the length of the straight segment structure (121) is L, the center line arc length corresponding to the arc segment structure (122) is S, and the total length of the stainless steel wire is L+S.

5. The precise assembly process of the threading nut according to claim 4, characterized in that: The stamping blanking die (500) comprises an upper die fixing seat (510), a die insert (520) and a lower die fixing seat (530), wherein the die insert (520) is arranged between the upper die fixing seat (510) and the lower die fixing seat (530), wherein the die insert (520) comprises an upper insert (521) installed on the upper die fixing seat (510) and a steel wire fixing movable block (526), ​​a fixed insert (522), a steel wire positioning insert (527), a lower insert (523), a steel wire positioning block (524) and a stainless steel wire axial position adjustment insert (525) installed on the lower die fixing seat (530), wherein the upper insert (521) and the lower insert (523) are connected to each other. Correspondingly, the steel wire fixing movable block (526) is installed on the upper insert (521), the lower insert (523) is arranged between the fixed insert (522) and the steel wire positioning block (524), the stainless steel wire axial position adjustment insert (525) is located on the right side of the steel wire positioning block (524), a plurality of steel wire positioning inserts (527) are provided and are installed on the fixed insert (522) at intervals, the number of the steel wire positioning inserts (527) is consistent with the number of stainless steel wire parts, the steel wire fixing movable block (526) is provided with a plurality of R grooves, the steel wire positioning block (524) is provided with a plurality of slots, and the stainless steel wire axial position adjustment insert (525) is provided with a plurality of U-shaped grooves; After the required length for blanking is calculated, the stainless steel wire is passed through a steel wire positioning insert (527) of corresponding specifications, and the position of the stainless steel wire part (120) in the die is adjusted by adjusting the stainless steel wire axial position adjustment insert (525), and the length of the stainless steel wire placed in the stamping blanking die (500) is determined. The steel wire is clamped by the steel wire fixing movable block (526) in the lower insert (523) and the upper insert (521), and the steel wire blanking process is completed under the action of the punching knife to obtain the stainless steel wire of the required length.

6. The precise assembly process of the threading nut according to claim 1, characterized in that: The specific steps of step S3 are as follows: select the corresponding wire chamfering clamp tooling and chamfering cutter disc according to the specifications of the stainless steel wire, design the chamfering cutter disc and the wire clamp tooling to match the equipment interface, and perform the chamfering process of the stainless steel wire end on the CNC chamfering machine to ensure that the end of the stainless steel wire is free of burrs, obtain a smooth rounded end, and reduce the friction resistance during the assembly process of the stainless steel wire; the chamfer of the end of the stainless steel wire is a rounded structure of not less than 0.5 mm.

7. The precise assembly process of the threading nut according to claim 1, characterized in that: In the step S4, a corresponding stainless steel wire press-fitting tool (600) is selected according to the wire nut part (130), the wire nut part (130) is first placed in the positioning installation groove of the press-fitting tool (600), and then the nozzle end part (110) is placed on the positioning cylinder of the rotating table of the press-fitting tool (600), and the stainless steel wire positioning hole is exposed by rotating the rotating table body of the press-fitting tool (600) to a predetermined angle, and the stainless steel wire part (120) is placed in the stainless steel wire positioning hole, and the cylinder movement stroke of the press-fitting tool (600) is adjusted, and the cylinder movement stroke is equal to the movement stroke of the stainless steel wire assembly process, and the cylinder is connected to a high-pressure gas source, and the gas source pressure is set to 0.2-0.5MPa, and the gas source switch is turned on to perform the press-fitting action of the stainless steel wire.

8. The precise assembly process of the threading nut according to claim 7, characterized in that: The press-fitting tool (600) comprises a fixed base structure (610), a rotating table structure (620), a power unit (630) and a plurality of lifting ear structures (640), wherein the plurality of lifting ear structures (640) are distributed at four corners of the fixed base structure (610), the fixed base structure (610) comprises a stainless steel plate (611) and a stainless steel annular fixing seat (612), wherein the stainless steel annular fixing seat (612) is fixed to the stainless steel plate (611) by a plurality of bolts, the rotating table structure (620) is connected to the stainless steel annular fixing seat (612), and the power unit (630) is installed on the stainless steel plate (611); The power unit (630) comprises a pressure source cylinder (631), a stainless steel ejector rod mechanism (632) and a stainless steel ejector pin (633); the pressure source cylinder (631) is connected to an external pressure source; one side of the stainless steel ejector rod mechanism (632) is connected to the pressure source cylinder (631) via a threaded structure, and the other side is connected to the stainless steel ejector pin (633) via a screw.

9. The precise assembly process of the threading nut according to claim 8, characterized in that: The rotating table structure (620) comprises a nut fixing clamping mechanism (621), an end positioning cylinder (622), a stainless steel wire guide mechanism (623), a rotating disk mechanism (624) and a reset mechanism (625) installed on a stainless steel annular fixed seat (612); the nut fixing clamping mechanism (621) and the end positioning cylinder (622) are installed on the rotating disk mechanism (624); the rotating disk mechanism (624) is rotatably connected to the stainless steel annular fixed seat (612); and the stainless steel wire guide mechanism (623) and the reset mechanism (625) are located on both sides of the rotating disk mechanism (624); During the press-fitting process, the nozzle end part (110) and the end positioning cylinder (622) are matched with each other through the cylinder to realize the assembly positioning of the large nozzle part; the wire nut part (130) is placed in the rectangular groove of the rotating disk mechanism (624), and the position of the wire nut part (130) in the rectangular groove is adjusted by rotating the screw of the nut clamping mechanism (621); the stainless steel wire guide mechanism (623) is processed with a through hole structure for the stainless steel wire part (120) to pass through, which is used for guiding the steel wire and the stainless steel wire ejector pin (633) during the forming process of the stainless steel wire part (120); the rotating disk mechanism (624) is installed with a rotating handle, and the reset mechanism (625) is installed with a reset spring for The rotary disk mechanism (624) is reset; after each wire pressing process is completed, the rotary disk mechanism (624) is rotated to the angle limited by the reset mechanism (625) by rotating the rotary handle, and the stainless steel wire part (120) is installed next time. The stainless steel wire part (120) is placed in the wire hole of the rotary disk mechanism (624). Under the action of the reset spring, the rotary disk mechanism (624) is restored to the initial position, and an external air source is connected. The pressure source cylinder (631) starts to work under the action of the external air pressure source. When the pressure source cylinder (631) works, it drives the stainless steel ejector mechanism (632) to move axially, and the stainless steel ejector mechanism (632) pushes the stainless steel ejector pin (633) to move axially, thereby realizing the assembly process.

10. The precise assembly process of threading nuts according to claim 1, characterized in that: In the step S5, after the assembly is completed, it is ensured that the outer end surface of the stainless steel wire part (120) is completely immersed in the wire hole of the wire nut part (130), and the depth is controlled to be 0.5 to 1 mm below the outer surface of the wire nut part (130). A plug gauge is used for indirect measurement to ensure that the assembly position of the stainless steel wire meets the requirements; the assembly gap (140) is controlled between 0.1 and 0.3 mm.

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