A precision assembly process for a threading nut

Abstract

The present application provides a kind of precise assembly process method of threading nut, comprising the following steps: S1, confirming the original form of stainless steel wire;S2, confirming the specification of stainless steel wire, according to the specification of stainless steel wire, the diameter of steel wire is selected, the blanking length of stainless steel wire is confirmed, and then blanking is carried out on the blanking die of stainless steel wire, to obtain the required length of stainless steel wire;S3, carry out the end chamfering of stainless steel wire;S4, select stainless steel wire pressing assembly tool according to the specification of steel wire, and carry out the pressing assembly process of stainless steel wire;S5, quality inspection process after stainless steel wire assembly: after assembly, use caliper to measure the size of the end face of the steel wire to the side of the steel wire nut part, to obtain the assembly distance of stainless steel wire;Use plug gauge to measure the assembly gap;And confirm the flexibility of nut rotation.The present application can realize good operability, high production efficiency, quality consistency and nut rotation flexibility in the process of threading nut assembly.

Description

Technical Field

[0001] This invention relates to the field of pipe connection technology, and more particularly to a precise assembly process method for threaded nuts. Background Technology

[0002] Existing assembly methods for pipe fittings and nuts include outer nut assembly, tightening nut assembly, locking nut assembly, and threaded nut assembly. Outer nut assembly has limitations in installation space, requiring sufficient radial fit space. Tightening nuts require specialized tightening equipment and are typically used for stainless steel nuts, but not for titanium alloy nuts. Locking nuts usually require two nuts for installation, increasing weight. Threaded nut assembly is suitable for scenarios with limited installation space and high self-locking requirements, and also offers weight reduction. However, existing threaded nut assembly methods suffer from poor operability and low production efficiency. Furthermore, threaded assembly carries risks of inconsistent quality and poor rotational flexibility. Summary of the Invention

[0003] To address the aforementioned technical problems, a precise assembly process method for threaded nuts is provided.

[0004] The technical means employed in this invention are as follows:

[0005] A precise assembly process for threaded nuts includes 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, confirm the cutting length of the stainless steel wire, and then cut the wire on the stainless steel wire stamping die to obtain the required length of stainless steel wire.

[0008] S3. Perform the stainless steel wire end chamfering process: Select the chamfering cutter head and chamfering clamping tool according to the specifications of the stainless steel wire, and perform chamfering processing on the stainless steel wire end;

[0009] S4. Select stainless steel wire pressing fixtures according to the specifications of the steel wire and carry out the pressing process of stainless steel wire, including the fixed installation of the wire threading nut part, the installation of the end part with the nozzle, and the installation of the stainless steel wire part. The wire threading nut part and the end part with the nozzle are connected by the assembly of the stainless steel wire part. After assembly, the stainless steel wire part is located in the wire hole of the wire threading nut part, and there is an assembly gap between the stainless steel wire part and the end part with the nozzle.

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

[0011] Furthermore, in step S1, the stainless steel wire raw material can be in the form of coil or straight bar. When the original form of the stainless steel wire is straight bar, step S2 is performed directly. When the original form of the stainless steel wire is coil, the coil stainless steel wire is straightened first, and then step S2 is performed.

[0012] The straightening process of coiled stainless steel wire is achieved by using a straightening fixture, and the straightness of the coiled stainless steel wire after the straightening process meets the technical requirement of ≤0.03mm.

[0013] Furthermore, the straightening fixture comprises two parts, left and right. The left half includes a handle I, seven rollers I, and three screws I mounted on the fixture body. The seven rollers I are arranged in two rows, with three rollers I in the upper row and four rollers I in the lower row. The screws I are positioned above the upper row of rollers I, and the handle I is positioned below the lower row of rollers I. The right half includes a handle II, seven rollers II, and three screws II mounted on the fixture body. The seven rollers II are arranged in two horizontal rows, front and back, with three rollers II in the front row and four rollers II in the back row. The screws II are positioned below the front side of the front row of rollers II, and the handle II is positioned behind the rear row of rollers II. The screws I and II are used to fix the rollers I and II, respectively.

[0014] The left half completes the wire straightening in the XYZ directions, with the X direction being the direction of wire movement; the right half completes the wire straightening in the XY directions, with the X direction being the direction of wire movement.

[0015] By fixing the wire straightening fixture on the mounting table, the stainless steel wire is installed in the wire groove between rollers I along the X direction. First, the right handle I is rotated to drive the rotation of roller I. Under the action of the friction of roller I, the stainless steel wire moves along the X direction, thereby achieving the straightening of the wire in the X and Y directions. Then, the left handle II is rotated to drive the rotation of roller II. Under the action of the friction of roller II, the stainless steel wire moves along the X direction, thereby achieving the straightening of the wire in the X, Y, and Z directions.

[0016] Furthermore, in step S2, the stainless steel wire specifications include five specifications: 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 inlet end and an arc segment structure integrated with the straight segment structure. The length of the straight segment structure is L, the arc length of the center line corresponding to the arc segment structure is S, and the total blanking length of the stainless steel wire is L+S.

[0018] Furthermore, the stamping die includes an upper die fixing seat, a die insert, and a lower die fixing seat. The die insert is disposed between the upper die fixing seat and the lower die fixing seat. The die insert includes an upper insert mounted on the upper die fixing seat and a wire fixing movable block, a fixed insert, a wire positioning insert, a lower insert, a wire positioning block, and a stainless steel wire axial position adjusting insert mounted on the lower die fixing seat. The upper insert and the lower insert are vertically corresponding. The wire fixing movable block is mounted on the upper insert. The lower insert is disposed between the fixed insert and the wire positioning block. The stainless steel wire axial position adjusting insert is located to the right of the wire positioning block. Multiple wire positioning inserts are provided and spaced apart on the fixed insert. The number of wire positioning inserts is consistent with the number of stainless steel wire parts. The wire fixing movable block is provided with multiple R-grooves. The wire positioning block is provided with multiple slots. The stainless steel wire axial position adjusting insert is provided with multiple U-grooves.

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

[0020] Further, the specific steps of step S3 are as follows: Select the corresponding wire chamfering clamping die and chamfering cutter head according to the specifications of the stainless steel wire. The chamfering cutter head and wire chamfering die are designed for compatibility with the equipment interface. The chamfering process of the stainless steel wire end is carried out on the CNC chamfering machine to ensure that the stainless steel wire end is burr-free and obtains a smooth rounded end, thereby reducing the frictional resistance during the assembly process of the stainless steel wire. The chamfer of the stainless steel wire end is a rounded structure of not less than 0.5mm.

[0021] Further, in step S4, a corresponding stainless steel wire pressing fixture is selected according to the wire threading nut part. First, the wire threading nut part is placed in the positioning and mounting groove of the pressing fixture. Then, the part with the nozzle end is placed on the positioning cylinder of the rotating table of the pressing fixture. The main body of the rotating table of the pressing fixture is rotated to a predetermined angle to expose the stainless steel wire positioning hole. The stainless steel wire part is then placed in the stainless steel wire positioning hole. The cylinder stroke of the pressing fixture is adjusted so that the cylinder stroke is equal to the stroke of the stainless steel wire assembly process. The cylinder is connected to a high-pressure air source, and the air source pressure is set to 0.2-0.5MPa. The air source switch is turned on to perform the stainless steel wire pressing action.

[0022] Furthermore, the pressing fixture includes a fixed base structure, a rotating table structure, a power unit, and multiple lifting lug structures. The multiple lifting lug structures are distributed at the four corners of the fixed base structure. The fixed base structure includes a stainless steel plate and a stainless steel annular fixed seat. The stainless steel annular fixed seat is fixed to the stainless steel plate by multiple bolts. The rotating table structure is connected to the stainless steel annular fixed seat. The power unit is mounted on the stainless steel plate.

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

[0024] Furthermore, the rotating table structure includes a nut fixing and clamping mechanism, an end positioning cylinder, and a stainless steel wire guiding mechanism, a rotating disk mechanism, and a reset mechanism mounted on a stainless steel annular fixed seat. The nut fixing and clamping mechanism and the end positioning cylinder are mounted on the rotating disk mechanism, which is rotatably connected to the stainless steel annular fixed seat. The stainless steel wire guiding 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 are aligned via a cylindrical fit to achieve the assembly and positioning of the large nozzle part. The wire threading nut part is placed in the rectangular slot of the rotating disk mechanism, and its position in the rectangular slot is adjusted by the screws of the rotating nut clamping mechanism. The stainless steel wire guide mechanism has through holes for the stainless steel wire part to pass through, guiding the wire and stainless steel wire ejector pin during the forming process. The rotating disk mechanism is equipped with a rotating handle, and the reset mechanism is equipped with a reset spring for resetting the rotating disk mechanism. After each wire press-fitting process is completed, the rotating handle is rotated to the reset mechanism's limit angle for the next stainless steel wire part installation. The stainless steel wire part is placed in the wire hole of the rotating disk mechanism, and the rotating disk mechanism returns to its initial position under the action of the reset spring. An external air source is then connected, and the pressure source cylinder starts working under the action of the external air pressure source. When the pressure source cylinder works, it drives the stainless steel ejector rod mechanism to move axially, which in turn drives the stainless steel ejector pin to move axially, thus completing the assembly process.

[0026] Furthermore, in step S5, after assembly, ensure that the outer end face of the stainless steel wire part is completely submerged 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 stainless steel wire assembly position 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. This invention provides a method for assembling wire nuts, which is applicable to stainless steel wires that are originally supplied in the form of discs or straight strips, and is not affected by the supply state of the wires.

[0029] 2. In this invention, the wire cutting length is determined by simulation calculation, which can accurately confirm the initial cutting length of the wire and greatly ensure the utilization rate of the wire material. The wire cutting process adopts punching cutting, which greatly improves the processing efficiency and processing accuracy compared with the laser cutting process, thus greatly improving the processing efficiency.

[0030] 3. This invention designs a semi-automated special steel wire pressing tool with high control precision and good consistency in the assembly process. It is suitable for mass production in factories and greatly improves assembly efficiency.

[0031] 4. The wire assembly process of the threaded nut of this 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 assembly process.

[0032] 5. The four sets of auxiliary tooling in this invention are wire straightening tooling, wire cutting tooling, wire chamfering cutter head tooling, and wire threading assembly tooling. Different specifications of threading nuts correspond to the above four sets of tooling, avoiding the operation of changing 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.

[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 threaded nut, and use a special pin gauge to measure the movement clearance between the stainless steel wire and the nozzle connector to ensure that the assembly can rotate flexibly.

[0034] Based on the above reasons, this invention can be widely applied in fields such as threaded nut assembly. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0037] Figure 2 This is a flowchart of the assembly process for the wire-threaded nut of the present invention.

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

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

[0040] Figure 5 This is a schematic diagram of the straight segment structure and the curved 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 diagram shows the insert of the stainless steel wire stamping die of the present invention, wherein (a) is an isometric view and (b) is a side view.

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

[0044] Figure 9The diagram shows the structure of the rotating platform, where (a) is an axonometric view and (b) is a top view.

[0045] Figure 10 This is a schematic diagram of the rotating disk mechanism.

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

[0047] In the diagram: 100, assembly component; 110, part with nozzle end; 120, stainless steel wire part; 130, wire-threaded nut part; 140, assembly clearance;

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

[0049] 200. Overall process route; 220. Blanking process; 210. Straightening process; 220. Confirmation of stainless steel wire specifications and blanking length process; 230. Stainless steel wire end chamfering process; 240. Stainless steel wire pressing process; 250. Post-assembly quality inspection process;

[0050] 300. Straightening fixture; 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 base; 520. Die insert; 530. Lower die fixing base; 521. Upper insert; 522. Fixing insert; 523. Lower insert; 524. Wire positioning block; 525. Stainless steel wire axial position adjusting insert; 526. Wire fixing movable block; 527. Wire positioning insert;

[0053] 600. Press-fitting fixture; 610. Fixed base structure; 620. Rotary table structure; 630. Power unit; 640. Lifting lug structure; 611. Stainless steel plate; 612. Stainless steel annular fixed seat; 621. Nut fixing and clamping mechanism; 622. End positioning cylinder; 623. Stainless steel wire guide mechanism; 624. Rotary disk mechanism; 625. Reset mechanism; 631. Pressure source cylinder; 632. Stainless steel push rod mechanism; 633. Stainless steel ejector pin. Detailed Implementation

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0058] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

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

[0060] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

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

[0062] This invention provides a precise assembly process for threaded nuts. The assembly process utilizes four sets of auxiliary tooling and two sets of dedicated inspection tools, achieving good operability, high production efficiency, consistent quality, and flexible nut rotation. The four sets of auxiliary tooling are: a wire straightening tooling, a wire cutting tooling, a wire chamfering cutter tooling, and a wire threading assembly tooling. Different specifications of threaded nuts correspond to these four sets of tooling, avoiding the need for parts replacement when using general-purpose tooling, ensuring the sustainability of the production rhythm during wire assembly, improving production efficiency, and guaranteeing good operability of the assembly process. During assembly, the stainless steel wire undergoes elastic-plastic deformation, expanding and tightening within the inner groove of the threaded nut due to the rebound force. The axial displacement of the stainless steel wire is ensured by the tooling stroke. After assembly, a dedicated plug gauge measures the sinking distance of the stainless steel wire in the wire hole of the threaded nut, and a dedicated pin gauge measures the clearance between the stainless steel wire and the nozzle connector, ensuring flexible rotation of the assembly.

[0063] like Figure 2 The diagram shows the process flow for assembling wire-threaded nuts. The overall process route (200) consists of 5 steps, including:

[0064] 1) The first step is to determine the shape of the stainless steel wire: confirm the original form of the stainless steel wire and proceed with the straightening process. Stainless steel wire raw materials come in two shapes: coiled and straight. The specific process route is determined based on the original form of the stainless steel wire. If the original form of the stainless steel wire is straight, proceed directly to the blanking process 220. If the original form of the stainless steel wire is coiled, a straightening process 210 is required first. The straightening process 210 for coiled stainless steel wire uses a dedicated straightening fixture 300 (straightening tool). After the straightening process 210, the straightness of the coiled stainless steel wire meets the technical requirement of ≤0.03mm.

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

[0066] 3) The third step is the stainless steel wire end chamfering process 230. Select the corresponding wire chamfering clamping die and chamfering cutter head according to the specifications of the stainless steel wire. The chamfering cutter head and wire clamping die are designed to match the equipment interface. The stainless steel wire end chamfering process is carried out on the CNC chamfering machine to ensure that the stainless steel wire end is burr-free and has a smooth rounded end, reducing the frictional resistance during the assembly process of the stainless steel wire. The chamfering of the stainless steel wire end is usually a rounded structure of not less than 0.5mm.

[0067] 4) The fourth step is the stainless steel wire pressing process 240. Select the wire threading assembly fixture according to the wire specifications, adjust the cylinder stroke, set the pressure, and perform the wire pressing assembly, including the fixing and installation of the nut, the installation of the nozzle end, and the installation of the stainless steel wire: Select the corresponding stainless steel wire pressing fixture 600 according to the wire threading nut part 130. First, place the wire threading nut part 130 in the positioning installation groove of the pressing fixture 600. Then, place the part with the nozzle end 110 on the positioning cylinder of the rotating table of the pressing fixture 600. Rotate the rotating table body of the pressing fixture 600 to a predetermined angle to expose the wire positioning hole, and place the stainless steel wire part 120 in the positioning hole. Adjust the cylinder stroke of the pressing fixture 600. The cylinder stroke needs to be equal to the stroke of the stainless steel wire assembly process. Connect a high-pressure air source. Generally, the air source pressure is set to 0.2-0.5 MPa (in this embodiment, it can be set to 0.3 MPa). Turn on the air source switch to perform the stainless steel wire pressing action.

[0068] 5) The fifth step is the quality inspection process 250 after assembly. After the assembly of the wire nut assembly 100 is completed, it is necessary to ensure that the outer end face of the stainless steel wire part 120 is completely submerged in the wire hole of the wire nut part 130. Generally, the depth is controlled to be about 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 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 assembly 100 after assembly, the assembly gap 140 needs to be measured. A plug needle is used for indirect measurement of the assembly gap 140 to ensure that the assembly meets the functional requirements of free rotation.

[0069] like Figure 3The diagram shows the structure of a stainless steel wire straightening fixture. The straightening fixture 300 includes handle I 310, handle II 340, 14 rollers (7 rollers on each side, i.e., 7 rollers I 320 and 7 rollers II 350), and 6 screws (3 screws on each side, i.e., 3 screws I 330 and 3 screws II 360). The straightening fixture 300 straightens stainless steel wires with a diameter of φ2.0 to φ4.0 by tightening and loosening handles I 310 and II 340. The straightening fixture 300 has a total of 14 rollers. The stainless steel wire is threaded between the rollers, and fine adjustments are made using the adjusting screws to achieve straightening. Specifically, the straightening tool is a general-purpose fixture, divided into left and right parts. The two parts have completely similar structures. The left half includes a handle I310, seven rollers I320, and three screws I330. The seven rollers I320 are arranged in two rows, with three rollers I320 in the upper row and four rollers I320 in the lower row. The screws I330 are located above the upper row of rollers I320, and the handle I310 is located below the lower row of rollers I320. The right half includes a handle II340, seven rollers II350, and three screws II360. The seven rollers II350 are arranged in two horizontal rows, with three rollers II350 in the front row and four rollers II350 in the rear row. The screws II360 are located below the front of the front rollers II350, and the handle II340 is located behind the rear rollers II350. Screws I330 and II360 are used to fix rollers I320 and II350, respectively. The left half completes the wire straightening in the XYZ directions (X direction is the direction of wire movement), and the right half completes the wire straightening in the XY directions (X direction is the direction of wire movement). By fixing the wire straightening fixture 300 on the mounting table, the stainless steel wire is installed in the wire groove between rollers I 320 along the X direction. First, the right handle I 310 is rotated to drive the rollers I 320 to rotate. Under the action of the friction of the rollers I 320, the stainless steel wire moves along the X direction, thereby achieving the straightening of the wire in the X and Y directions. Then, the left handle II 340 is rotated to drive the rollers II 350 to rotate. Under the action of the friction of the rollers II 350, the stainless steel wire moves along the X direction, thereby achieving the straightening of the wire in the X, Y, and Z directions.

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

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

[0072] Figure 7 This is a schematic diagram of the mold insert 520. The mold insert 520 includes an upper insert 521 mounted on the upper mold fixing base 510, and a wire fixing movable block 526, a fixing insert 522, a wire positioning insert 527, a lower insert 523, a wire positioning block 524, and a stainless steel wire axial position adjusting insert 525 mounted on the lower mold fixing base 530. The upper insert 521 and the lower insert 523 correspond vertically. The wire fixing movable block 526 is mounted on the upper insert 521. The lower insert 523 is positioned between the fixing insert 522 and the wire positioning block 524. The stainless steel wire axial position adjusting insert 525 is located to the right of the wire positioning block 524. 27 are provided with multiple, spaced-apart, fixed inserts 522, multiple R-grooves on the wire fixing movable block 526, multiple slots on the wire positioning block 524, and multiple U-grooves on the stainless steel wire axial position adjusting insert 525; the number of wire positioning inserts 527 is consistent with the number of stainless steel wire parts, and the number can be adjusted according to the actual wire specifications. When the stainless steel wire specifications and quantity are adjusted, the number of wire positioning inserts 527 is adjusted accordingly, and the number of R-grooves on the wire fixing movable block 526, the number of slots on the wire positioning block 524, and the number of U-grooves on the stainless steel wire axial position adjusting insert 525 are also adjusted. Figure 4 The method described above calculates the required length for cutting, then passes the stainless steel wire through the corresponding specification wire positioning insert 527. By adjusting the axial position of the stainless steel wire, the position of the stainless steel wire part 120 in the mold is adjusted by adjusting the insert 525. The length of the stainless steel wire placed in the stamping die 500 is determined. The wire is clamped by the wire fixing movable block 526 in the lower insert 523 and the upper insert 521. Under the action of the punching cutter, the wire cutting process is completed, and the required length of stainless steel wire is obtained.

[0073] Figure 8This is a schematic diagram of a stainless steel wire pressing fixture 600. The stainless steel wire pressing fixture 600 can be divided into four parts according to its function: a fixed base structure 610, a rotating table structure 620, a power unit 630, and a lifting lug structure 640. The fixed base structure 610 includes a stainless steel plate 611 and a stainless steel annular fixing seat 612. The stainless steel annular fixing seat 612 is fixed to the stainless steel plate 611 by four bolts, mainly serving a fixing function to ensure that the steel wire pressing process does not tip over. The rotating table structure 620 is connected to the stainless steel annular fixing seat 612, and the power unit 630 is mounted on the stainless steel plate 611. The power unit 630 includes a pressure source cylinder 631, a stainless steel push rod mechanism 632, and a stainless steel push pin 633, all mounted on the stainless steel plate 611. The pressure source cylinder 631 is connected to an external pressure source. One side of the stainless steel push rod mechanism 632 is connected to the pressure source cylinder 631 via a threaded structure, and the other side of the stainless steel push rod mechanism 632 is connected to the stainless steel push pin 633 via screws. There are four lifting lug structures 640, which are evenly distributed at the four corners of the fixed base structure 610, ensuring convenient movement of the tooling during transportation.

[0074] Figure 9 The diagram shows the structure of the rotating table structure 620. The rotating table structure 620 can be divided into a nut fixing and clamping mechanism 621, an end positioning cylinder 622, a stainless steel wire guiding mechanism 623, a rotating disk mechanism 624, and a reset mechanism 625, all mounted on a stainless steel annular fixed seat 612. The nut fixing and clamping mechanism 621 and the end positioning cylinder 622 are mounted on the rotating disk mechanism 624, which is rotatably connected to the stainless steel annular fixed seat 612. The stainless steel wire guiding 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 aligned via a cylindrical fit to achieve the assembly and positioning of the large nozzle part. The wire-threaded 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. The stainless steel wire guide mechanism 623 is machined with a through hole structure for the passage of the stainless steel wire part 120, which guides the steel wire and the stainless steel wire ejector pin 633 structure during the forming process of the stainless steel wire part 120. The rotating disk mechanism 624 is equipped with a rotating handle. After each steel wire pressing process is completed, the rotating handle is rotated to the limit angle of the reset mechanism 625 to perform the next installation of the stainless steel wire part 120. The reset mechanism 625 is equipped with a spring structure to achieve the reset of the rotating disk mechanism 624.

[0075] Figure 10The diagram shows the structure of the rotary 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-threaded nut part 130 is placed in the rectangular groove of the rotary 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. Then, by rotating the rotating handle installed on the rotary disk mechanism 624, the rotary disk mechanism 624 is rotated to the angle limited by the reset mechanism 625. Then, 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 returns to the initial position. When 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 push rod mechanism 632 to move axially. The stainless steel push rod mechanism 632 pushes the stainless steel ejector pin 633 to move axially, thus realizing the assembly process.

[0076] Use calipers (plug gauges) to measure the distance from the end face of the inserted steel wire to the side of the threaded nut to obtain the assembly distance of the stainless steel wire. See [link / reference]. Figure 11 Use plug gauges according to Figure 1 The assembly clearance of 140 mm was measured; and the flexibility of nut rotation was confirmed.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 threaded nuts, characterized in that, Includes the following steps: S1. Confirm the original shape of the stainless steel wire; S2. Confirm the specifications of the stainless steel wire, select the wire diameter according to the specifications of the stainless steel wire, confirm the cutting length of the stainless steel wire, and then cut the wire on the stainless steel wire stamping die (500) to obtain the required length of stainless steel wire. S3. Perform the stainless steel wire end chamfering process: Select the chamfering cutter head and chamfering clamping tool according to the specifications of the stainless steel wire, and perform chamfering processing on the stainless steel wire end; S4. Select a stainless steel wire pressing fixture (600) according to the specifications of the steel wire and carry out the pressing process of the stainless steel wire, including the fixed installation of the wire thread nut part (130), the installation of the nozzle end part (110) and the installation of the stainless steel wire part (120). The wire thread nut part (130) and the nozzle end part (110) are connected by the stainless steel wire part (120). After assembly, the stainless steel wire part (120) is located in the wire hole of the wire thread nut part (130), and there is an assembly gap (140) between the stainless steel wire part (120) and the nozzle end part (110). S5. Quality inspection procedures after stainless steel wire assembly: After assembly, use calipers to measure the distance from the end face of the wire to the side of the wire nut part (130) to obtain the assembly distance of the stainless steel wire; use plug gauges to measure the assembly gap (140); and confirm the flexibility of the nut rotation. In step S4, the corresponding stainless steel wire pressing fixture (600) is selected according to the wire threading nut part (130). First, the wire threading nut part (130) is placed in the positioning installation groove of the pressing fixture (600). Then, the part with the nozzle end (110) is placed on the positioning cylinder of the rotating table of the pressing fixture (600). The main body of the rotating table of the pressing fixture (600) is rotated to a predetermined angle to expose the stainless steel wire positioning hole. The stainless steel wire part (120) is placed in the stainless steel wire positioning hole. The cylinder stroke of the pressing fixture (600) is adjusted. The cylinder stroke is equal to the stroke of the stainless steel wire assembly process. The cylinder is connected to a high-pressure air source. The air source pressure is set to 0.2-0.5MPa. The air source switch is turned on to perform the stainless steel wire pressing action. The press-fitting fixture (600) includes a fixed base structure (610), a rotating table structure (620), a power unit (630), and multiple lifting lug structures (640). The multiple lifting lug structures (640) are distributed at the four corners of the fixed base structure (610). The fixed base structure (610) includes a stainless steel plate (611) and a stainless steel annular fixing seat (612). The stainless steel annular fixing seat (612) is fixed to the stainless steel plate (611) by multiple bolts. The rotating table structure (620) is connected to the stainless steel annular fixing seat (612). The power unit (630) is installed on the stainless steel plate (611). The power unit (630) includes a pressure source cylinder (631), a stainless steel push rod mechanism (632), and a stainless steel push pin (633). The pressure source cylinder (631) is connected to an external pressure source. The stainless steel push rod mechanism (632) is connected to one side of the pressure source cylinder (631) through a threaded structure, and the other side is connected to the stainless steel push pin (633) through a screw. The rotating table structure (620) includes a nut fixing and clamping mechanism (621), an end positioning cylinder (622), a stainless steel wire guiding mechanism (623), a rotating disk mechanism (624), and a reset mechanism (625) mounted on a stainless steel annular fixed seat (612). The nut fixing and clamping mechanism (621) and the end positioning cylinder (622) are mounted on the rotating disk mechanism (624), which is rotatably connected to the stainless steel annular fixed seat (612). The stainless steel wire guiding 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 aligned via cylindrical engagement to achieve the assembly and positioning of the large nozzle part; the wire thread nut part (130) is placed in the rectangular groove of the rotating disk mechanism (624), and the position of the wire thread nut part (130) in the rectangular groove is adjusted by the screw of the rotating nut clamping mechanism (621); the stainless steel wire guide mechanism (623) is machined with a through hole structure for the stainless steel wire part (120) to pass through, and is used to guide the steel wire and stainless steel wire ejector pin (633) during the forming process of the stainless steel wire part (120); the rotating disk mechanism (624) is equipped with a rotating handle, and the reset mechanism (625) is equipped 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 of the reset mechanism (625) by rotating the rotary handle. The stainless steel wire part (120) is installed for the 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) returns to the initial position. The external air source is connected, and 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 push rod mechanism (632) to move axially. The stainless steel push rod mechanism (632) pushes the stainless steel push pin (633) to move axially, thus realizing the assembly process.

2. The precise assembly process method for the threaded nut according to claim 1, characterized in that, In step S1, the stainless steel wire raw material can be in the form of coil or straight bar. When the original form of the stainless steel wire is straight bar, step S2 is performed directly. When the original form of the stainless steel wire is coil, the coil stainless steel wire is straightened first, and then step S2 is performed. The straightening process of the coiled stainless steel wire is achieved by using a straightening fixture (300), and the straightness of the coiled stainless steel wire after the straightening process meets the technical requirement of ≤0.03mm.

3. The precise assembly process method for the threaded nut according to claim 2, characterized in that, The straightening fixture (300) comprises two parts, left and right. The left part includes a handle I (310), seven rollers I (320), and three screws I (330) mounted on the fixture body. The seven rollers I (320) are arranged in two rows, with three rollers I (320) in the upper row and four rollers I (320) in the lower row. The screws I (330) are positioned above the upper row of rollers I (320), and the handle I (310) is positioned below the lower row of rollers I (320). The right part includes a handle I (310) mounted on the fixture body. The device comprises a handle II (340), seven rollers II (350), and three screws II (360). The seven rollers II (350) are arranged in two horizontal rows, with three rollers II (350) in the front row and four rollers II (350) in the rear row. The screws II (360) are located below the front of the front rollers II (350), and the handle II (340) is located behind the rear rollers II (350). The screws I (330) and II (360) are used to fix rollers I (320) and II (350), respectively. The left half completes the wire straightening in the XYZ directions, with the X direction being the direction of wire movement; the right half completes the wire straightening in the XY directions, with the X direction being the direction of wire movement. By fixing the wire straightening fixture (300) on the mounting table, the stainless steel wire is installed in the wire groove between rollers I (320) along the X direction. First, the right handle I (310) is rotated to drive the rollers I (320) to rotate. The stainless steel wire moves along the X direction under the action of the friction of rollers I (320), thereby achieving the straightening of the wire in the XY direction. Then, the left handle II (340) is rotated to drive the rollers II (350) to rotate. The stainless steel wire moves along the X direction under the action of the friction of rollers II (350), thereby achieving the straightening of the wire in the XYZ direction.

4. The precise assembly process method for the threaded nut according to claim 1, characterized in that, In step S2, the stainless steel wire specifications 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 consists of a straight section structure (121) at the inlet end and an arc section structure (122) integrated with the straight section structure (121). The length of the straight section structure (121) is L, the arc length of the center line corresponding to the arc section structure (122) is S, and the total blanking length of the stainless steel wire is L+S.

5. The precise assembly process method for the threaded nut according to claim 4, characterized in that, The stamping die (500) includes an upper die holder (510), a die insert (520), and a lower die holder (530). The die insert (520) is disposed between the upper die holder (510) and the lower die holder (530). The die insert (520) includes an upper insert (521) mounted on the upper die holder (510) and a wire fixing movable block (526), ​​a fixed insert (522), a wire positioning insert (527), a lower insert (523), a wire positioning block (524), and a stainless steel wire axial position adjusting insert (525) mounted on the lower die holder (530). The upper insert (521) and the lower insert (523) are mounted on the upper die holder (510). Correspondingly, the wire fixing movable block (526) is installed on the upper insert (521), the lower insert (523) is set between the fixed insert (522) and the wire positioning block (524), the stainless steel wire axial position adjusting insert (525) is located on the right side of the wire positioning block (524), the wire positioning insert (527) is provided in multiple and is installed at intervals on the fixed insert (522), the number of the wire positioning insert (527) is consistent with the number of stainless steel wire parts, the wire fixing movable block (526) is provided with multiple R grooves, the wire positioning block (524) is provided with multiple slots, and the stainless steel wire axial position adjusting insert (525) is provided with multiple U-shaped grooves; After calculating the required length for cutting, the stainless steel wire is passed through the corresponding specification wire positioning insert (527). The position of the stainless steel wire part (120) in the mold is adjusted by adjusting the axial position of the stainless steel wire by adjusting the insert (525). The length of the stainless steel wire placed in the stamping blanking mold (500) is determined. The wire is clamped by the wire fixing movable block (526) in the lower insert (523) and upper insert (521). The wire cutting process is completed under the action of the punching cutter to obtain the required length of stainless steel wire.

6. The precise assembly process method for the threaded nut according to claim 1, characterized in that, The specific steps of step S3 are as follows: Select the corresponding wire chamfering clamping die and chamfering cutter head according to the specifications of the stainless steel wire. The chamfering cutter head and wire chamfering die are designed to match the equipment interface. The chamfering process of the stainless steel wire end is carried out on the CNC chamfering machine to ensure that the stainless steel wire end is burr-free and obtains a smooth rounded end, thereby reducing the frictional resistance during the assembly process of the stainless steel wire. The chamfer of the stainless steel wire end is a rounded structure of not less than 0.5mm.

7. The precise assembly process method for the threaded nut according to claim 1, characterized in that, In step S5, after assembly, ensure that the outer end face of the stainless steel wire part (120) is completely submerged in the wire hole of the wire nut part (130), and control the depth to be 0.5~1mm below the outer surface of the wire nut part (130). Use a plug gauge for indirect measurement to ensure that the stainless steel wire assembly position meets the requirements; the assembly gap (140) is controlled between 0.1~0.3mm.

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