Processing method of spinneret and lyocell spinneret

Abstract

The present invention discloses a method for processing a spinneret, comprising: obtaining a sheet material, pre-treating the sheet material to obtain a blank of the spinneret; installing the blank on an automatic punching machine, punching the same position of the blank at least three times, performing a modification process after punching the blank each time, and obtaining the spinneret. The present invention also discloses a lyocell spinneret. The present invention performs multiple punching operations on the same position in the spinneret blank, so that the spinneret holes formed by the multiple punching have low roughness and higher dimensional accuracy, and the material strength in the hole is enhanced, which can solve the problems of easy wire breakage, wire doubling, easy adhesion, and difficulty in cleaning when changing the plate in spinning production.

Description

Technical Field

[0001] The invention relates to the technical field of lyocell spinneret production, in particular to a spinneret processing method and the lyocell spinneret. Background Art

[0002] One of the equipments for producing lyocell fiber is the spinning machine, which is completely different from the traditional viscose fiber spinning machine. It uses a spinneret assembly. The structure of the nozzle assembly of the spinning machine is relatively complex, and the spinneret of the single spindle spinneret assembly is a circular structure plate. The function of the spinneret is to transform the viscous polymer melt or solution into a thin flow with a specific cross-section through micropores, and solidify it into a filament through a coagulation medium such as air or a coagulant. The spinning assembly is needed when producing thermal and moisture comfort functional composite fibers.

[0003] In order to meet the demand for tens of thousands to hundreds of thousands of holes of Lyocell spinnerets on the market, the existing square and circular spinnerets cannot meet the requirements of tens of thousands to hundreds of thousands of holes under the conditions of limited working range, same working pressure and working area. The Lyocell spinneret requires the hole size accuracy of ±0.002mm. The inner surface roughness of the guide holes and outlet holes processed by ordinary spinnerets punched by laser, drilling and electric spark is high, and the quality of each hole is uneven. From the overall point of view, it cannot fully meet the accuracy requirements of ≤0.1um and size. During production, the fiber is easy to adhere to the hole, which makes it difficult to change the plate and clean the impurities in the hole. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for processing a spinneret, aiming to solve the technical problem described in the background technology.

[0005] In a first aspect, the present invention provides a method for processing a spinneret, the processing method comprising:

[0006] Obtaining a sheet material, and pre-treating the sheet material to obtain a blank of the spinneret;

[0007] The blank is mounted on an automatic punching machine, and the same position of the blank is punched at least 3 times. After each punching of the blank is completed, the blank is modified to obtain the spinneret, wherein the first punching stroke during the first punching is equal to the thickness of the spinneret, the second punching stroke during the second punching is greater than the thickness of the spinneret, the diameter of the punching needle during the second punching is smaller than the diameter of the straight hole of the spinneret in the spinneret, the diameter of the punching needle during the third punching is equal to the diameter of the straight hole of the spinneret in the spinneret, and the inner surface roughness of the spinneret hole after the third punching is ≤0.1um.

[0008] In one embodiment, the step of mounting the blank on an automatic punching machine, punching the same position of the blank at least three times, and performing a modification process on the blank after each punching process comprises:

[0009] Obtaining a first punching stroke and a first punching frequency, and performing a first punching on the blank according to the first punching stroke and the first punching frequency, wherein the first punching stroke is equal to the thickness of the spinneret;

[0010] The blank after the first punching is removed from the automatic punching machine, and the blank is subjected to a first modification process;

[0011] Obtaining a second punching stroke and a second punching frequency, and performing a second punching on the blank according to the second punching stroke and the second punching frequency, wherein the second punching stroke is greater than the thickness of the spinneret, and the diameter of the punching needle during the second punching is less than the diameter of the spinneret straight hole in the spinneret;

[0012] The blank after the second punching is removed from the automatic punching machine, and the blank is subjected to a second modification process;

[0013] Obtaining a punching force and a third punching frequency, and performing a third punching on the blank according to the punching force and the third punching frequency, wherein the diameter of the punching needle during the third punching is equal to the diameter of the spinneret hole in the spinneret plate, and the inner surface roughness of the spinneret hole after the third punching is ≤0.1 um;

[0014] The blank after the third punching is taken off from the automatic punching machine, and the blank is subjected to a third modification process.

[0015] In one embodiment, the first punching stroke is 1.5 mm, the first punching frequency is 1 second / hole, the second punching stroke is 1.8 mm, the second punching frequency is 0.5 second / hole, the punching force is 20 N, and the third punching frequency is 0.5 second / hole.

[0016] In one embodiment, the step of removing the blank after the first punching from the automatic punching machine and performing a first modification process on the blank comprises:

[0017] The blank after the first punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank;

[0018] Obtaining a shaping mold, and shaping the blank after the impurities are cleaned according to the shaping mold;

[0019] The shaped blank is removed from the shaping mold and the wire-exiting surface of the blank is ground to ensure that the grinding of the wire-exiting surface meets the preset requirements;

[0020] The ground blank is cleaned under high pressure to remove the abrasive impurities on the blank.

[0021] In one embodiment, the step of removing the blank after the second punching from the automatic punching machine and performing a second modification process on the blank comprises:

[0022] The blank after the second punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank;

[0023] Grinding the wire-out surface and the wire-in surface of the blank after the impurities have been cleaned, so as to ensure that the grinding of the wire-out surface and the wire-in surface meets the preset requirements;

[0024] The ground blank is cleaned under high pressure to remove the abrasive impurities on the blank.

[0025] In one embodiment, the step of removing the blank after the third punching from the automatic punching machine and performing a third modification treatment on the blank comprises:

[0026] The blank after the third punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank;

[0027] Polishing the wire outlet surface and the wire inlet surface of the blank after the impurities are cleaned to ensure that the polishing of the wire outlet surface and the wire inlet surface meets the preset requirements;

[0028] The polished blank is cleaned under high pressure to remove polishing material impurities on the blank.

[0029] In one embodiment, the step of cleaning the blank from impurities comprises:

[0030] Obtaining degreasing liquid, and placing the blank into a soaking tank containing the degreasing liquid and soaking for a first period of time;

[0031] Rinse the soaked blank with clean water of a preset temperature for a second period of time;

[0032] Putting the rinsed blank into an ultrasonic cleaning machine for cleaning for a third period of time;

[0033] The blank is taken out from the ultrasonic cleaning machine and placed in a drying box for drying.

[0034] In one embodiment, the step of obtaining a sheet material, pre-treating the sheet material, and obtaining a blank of the spinneret comprises:

[0035] Obtaining a plate, and cutting the plate into a preset size;

[0036] Obtain a stamping die, and stamp the blanked sheet material according to the stamping die;

[0037] Obtain a trimming die, and perform trimming on the blank after stamping according to the trimming die;

[0038] A shaping die is obtained, and the blank after trimming is shaped according to the shaping die to obtain a blank of a spinneret.

[0039] In a second aspect, the present invention provides a lyocell spinneret, which is prepared by the method described in any one of the first aspects, the spinneret is annular, and is provided with spinneret holes, and the inner surface roughness of the spinneret holes is ≤0.1 um.

[0040] The above-mentioned spinneret processing method reduces the surface roughness of the spinneret hole, has high dimensional accuracy, and greatly increases the strength inside the hole through three or more punching operations and post-punching modification operations. It can solve the problem of easy wire breakage and fiber spinning in spinning production. The single-use cycle of the manufactured spinneret can reach more than 20 days, which extends the number of times the spinneret is replaced. At the same time, the spinneret hole of the manufactured spinneret has low roughness, and plate replacement and cleaning are simpler and easier, which reduces the labor intensity of the staff and reduces the labor time. The material strength in the hole is higher than that of the traditional manufacturing process, and the working pressure used is higher, which makes the spinneret more adaptable and can work under higher working pressure.

[0041] The above-mentioned Lyocell spinneret has a simple structure and adopts a circular ring structure. Because it adopts sheet material blanking and stamping processing, the product processing cost is low, the production efficiency is high, and the quality consistency is good. It meets the requirements of large-tonnage spinning machines and improves the spinning efficiency of the spinning machine. At the same time, it is not easy to cause problems such as wire breakage and wire doubling during the spinning process, and it is also convenient to change the plate and clean it. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of a process of a spinneret processing method according to an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the process flow of a method for processing a spinneret in one embodiment of the present invention;

[0044] Figure 3 A side view of a lyocell spinneret in one embodiment of the present invention;

[0045] Figure 4 FIG. 1 is a plan view of a lyocell spinneret in one embodiment of the present invention.

[0046] Description of symbols in the figure:

[0047] 1-Wire inlet side; 2-Wire outlet side. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0049] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship of the coordinate system shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] First, refer to Figure 1 and Figure 2 The present invention provides a method for processing a spinneret, the method comprising:

[0053] S110, obtaining a sheet material, and pre-treating the sheet material to obtain a blank of the spinneret;

[0054] The pretreatment includes blanking, punching, trimming and shaping operations in sequence.

[0055] S120, installing the blank on an automatic punching machine, punching the same position of the blank at least three times, and modifying the blank after each punching to obtain the spinneret.

[0056] Among them, the first punching stroke during the first punching is equal to the thickness of the spinneret, the second punching stroke during the second punching is greater than the thickness of the spinneret, the diameter of the punching needle during the second punching is smaller than the diameter of the straight hole of the spinneret in the spinneret, the diameter of the punching needle during the third punching is equal to the diameter of the straight hole of the spinneret in the spinneret, and the inner surface roughness of the spinneret hole after the third punching is ≤0.1um.

[0057] The three punchings described in this embodiment actually refer to three rounds of punching on the spinneret blank; the punching is performed according to the shape and size requirements of the spinneret to be produced. As the number of rounds increases, the roughness inside the spinneret hole after the final processing is low and the dimensional accuracy is high.

[0058] It is important to know that the deformation behavior of metal materials under tension includes four stages:

[0059] 1. Elastic deformation stage: In this stage, as the load increases, the strain (ε) increases in proportion to the stress (σ), that is, strain ε=σ / E (E is the elastic modulus). If the load is removed, the specimen will return to its original state, showing elastic deformation. This stage is characterized by reversibility, that is, the material deforms under the action of external force, but after the external force disappears, the material can return to its original state.

[0060] 2. Yield stage: After exceeding the elastic stage, the material enters the yield stage. In this stage, the strain continues to increase, but the stress no longer increases linearly with the strain, but fluctuates up and down within a range. The elongation of the specimen increases sharply, and this phenomenon is called yield. If all loads are removed at this time, the specimen will not completely recover to its original state, showing permanent deformation. For materials with obvious yield phenomenon, the yield point can be further divided into upper yield point and lower yield point; for materials with unobvious yield phenomenon, the stress value that produces 0.2% residual deformation is often used as the yield strength.

[0061] 3. Hardening stage (strengthening stage): After the specimen passes through the yield stage, the stress-strain curve shows an upward trend. In this stage, the material undergoes cold work hardening, that is, the material's ability to resist deformation is enhanced. The stress reaches a maximum value at a certain point, which is called tensile strength. The characteristic of this stage is that the material is continuously strengthened during the plastic deformation process, which improves the strength of the material.

[0062] 4. Necking stage: After the specimen is stretched to a certain extent, the load decreases as the specimen stretches. At the same time, the material begins to undergo local necking, that is, the cross-sectional area of ​​the material in a certain area decreases. When the necking occurs to a certain extent, the material eventually breaks. This stage marks the transition of the material from uniform plastic deformation to non-uniform plastic deformation until fracture.

[0063] Among them, the method disclosed in the present application belongs to a stamping process. Since there are many types of spinnerets and the requirements of each spinneret are different, the stroke / punching force during punching can be set according to the size of the spinneret (such as the thickness of the spinneret or the length of the spinneret hole), and the diameter of the punch needle can be set according to the shape requirements of the spinneret hole (such as the diameter). Then, the spinneret is processed (punched) according to the stroke / punching force and the punch needle diameter each time. Each time a hole is punched, the punch needle contacts and rubs against the hole wall, which plays a role of grinding and polishing. After the third punching and modification treatment, the inner surface roughness of the spinneret hole in the spinneret obtained is ≤0.1um.

[0064] In this embodiment, the surface roughness of the spinneret hole is reduced by three or more punching operations (and post-punching modification operations). While the surface roughness is reduced, the strength inside the hole is greatly increased, which can meet the fiber spinning requirements of not easily breaking and doubling the yarns in spinning production. The manufactured spinneret single plate can meet the requirements as a whole, and the single use cycle can reach more than 20 days, which extends the number of times the spinneret is replaced. At the same time, since the roughness inside the spinneret hole of the manufactured spinneret is low, plate replacement and cleaning are simpler and easier, which reduces the labor intensity of the staff and reduces the working time. The material strength in the hole is higher than that of the traditional manufacturing process, and the working pressure used is higher, which makes the spinneret more adaptable and can work under higher working pressure.

[0065] It should be noted that a spinneret well known to those skilled in the art includes a conical first section (guide hole) and a cylindrical second section (straight hole) in sequence, and the second section is connected to the end with a smaller diameter in the first section. Figure 1 and Figure 2 The step of punching the same position of the blank at least three times and modifying the blank after each punching is completed comprises:

[0066] S121, obtaining a first punching stroke and a first punching frequency, and performing a first punching on the blank according to the first punching stroke and the first punching frequency;

[0067] Among them, the stroke refers to the stroke of the punch needle moving in the direction of the wire outlet surface with the wire inlet surface as the horizontal plane; the punch needle during punching is a cylindrical shape with a cone. Specifically, in this (first) punching, the punch needle for the first punching is selected according to the shape and size of the required spinneret hole (the position of the hole punched in the first time in the spinneret corresponding to the first section (guide hole) must match the shape and size of the first section (guide hole)). The first stroke is equal to the thickness of the spinneret. After the first punching, the punch needle will form a blind hole in the spinneret with a shape similar to that of the punch needle due to the material properties (the blank material will accumulate at the outlet of the spinneret due to the material properties). In this punching, the first section (guide hole) of the spinneret is processed. The time of this punching is affected by the blank thickness, the punch needle design and the capacity of the punching machine.

[0068] Specifically, the first punching is to process the guide hole of the spinneret hole so that the roughness, dimensional accuracy and hardness of the inner surface of the guide hole meet the requirements (the roughness of the inner surface of the guide hole is ≤0.1um, and the dimensional accuracy can be ≤±0.001mm).

[0069] S122, removing the blank after the first punching from the automatic punching machine, and performing a first modification process on the blank;

[0070] Among them, this modification treatment is to ensure that there are no impurities on the surface of the blank, and at the same time remove the blank material accumulated on the wire outlet surface and grind the wire outlet surface to turn the blind hole into a through hole (the prototype of the spinneret hole), and facilitate the next process. The modification treatment includes impurity cleaning, shaping, grinding and cleaning operations in sequence.

[0071] S123, obtaining a second punching stroke and a second punching frequency, and performing a second punching on the blank according to the second punching stroke and the second punching frequency;

[0072] Among them, in this embodiment, the punching needle for the second punching is selected according to the shape and size of the spinneret hole (specifically the diameter of the second section), the diameter of the punching needle is slightly smaller than the diameter of the second section, the second punching stroke is greater than the first punching stroke / the thickness of the spinneret, and the purpose of this punching is to perform the first processing of the second section of the through hole after the first punching (i.e., the forming of the straight hole), and the time of this punching is affected by the state of the material after the first punching, the frequency of the punching equipment and the wear of the punching needle (the time of this punching can be reduced by replacing the punching needle).

[0073] Specifically, the second punching is to process the straight hole of the spinneret (the first targeted) and the punching stroke is greater than the thickness of the spinneret to avoid inadequate processing of the straight hole due to the shape of the punch needle (the needle head is conical) (or to fully process the hole walls of each section of the straight hole). The diameter of the punch needle is smaller than the diameter of the straight hole, so the hole wall can be processed accurately to avoid deformation of the hole wall or size deviation due to this punching, so that it gradually tends to the final straight hole shape, laying the foundation for the third punching to finalize.

[0074] S124, removing the blank after the second punching from the automatic punching machine, and performing a second modification process on the blank;

[0075] Among them, this modification treatment is to ensure that there are no impurities on the surface of the blank, improve the smoothness of the inlet and outlet surfaces of the spinneret, and facilitate the next process. The modification treatment includes cleaning, grinding and cleaning operations in sequence.

[0076] S125, obtaining a punching force and a third punching frequency, and performing a third punching on the blank according to the punching force and the third punching frequency, wherein the inner surface roughness of the spinneret hole after the third punching is ≤0.1 um, and the spinneret hole size accuracy is ≤±0.001 mm, and the hardness is improved;

[0077] Among them, in this embodiment, the punching needle for the third punching is selected according to the shape and size of the spinneret hole (specifically, the diameter of the second section), and the diameter of the punching needle is equal to the diameter of the second section. At the same time, displacement control is not used but force is used to control the perforation of the straight hole (after the first two punchings, the fluidity of the hole surface is reduced. By adjusting the punching force, the hardened material can be better penetrated to complete the punching). The purpose of this punching is to perform a second processing on the straight hole (second section) after the second punching (i.e., shaping the straight hole). The time of this punching is affected by the state of the material after the first punching, the frequency of the punching equipment, and the wear of the punching needle (the time of this punching can be reduced by replacing the punching needle).

[0078] Specifically, the third punching is to process the straight hole of the spinneret hole (the second targeted) to more effectively control the dimensional error. The purpose is to accurately shape the straight hole after the first two punchings. This processing uses punching force for processing, which can be more suitable for the situation inside the hole after two processings, ensuring that the final dimensional accuracy of the straight hole meets the requirements (that is, the surface roughness inside the straight hole is ≤0.1um, and the dimensional accuracy can be ≤±0.001mm). The surface roughness inside the spinneret hole after the third punching is ≤0.1um, and the dimensional accuracy of the spinneret hole is ≤±0.001mm.

[0079] S126, removing the blank after the third punching from the automatic punching machine, and performing a third modification process on the blank.

[0080] Among them, this modification treatment is to ensure that there are no impurities on the surface of the spinneret and to improve the smoothness of the inlet and outlet surfaces of the spinneret. The modification treatment includes cleaning, polishing and cleaning operations in sequence. In the actual spinneret operation, the number of punching times can be set according to the material and size of the spinneret.

[0081] In this embodiment, the diameter of the punch needle during the second punching is slightly smaller than the diameter of the second section, and the diameter of the punch needle during the third punching is equal to the diameter of the second section. The diameter of the straight hole after the third punching is required to reach the diameter of the straight hole of the preset spinneret. After two processing (punching) of the straight hole, the dimensional accuracy of the spinneret can be ≤±0.001mm.

[0082] In this embodiment, each time the blank is punched, it is necessary to ensure that the blank is concentric with the equipment tooling of the automatic punching machine, and the bottom plane of the blank is consistent with the flatness of the worktable of the machine tool, so as to ensure that the spinneret does not deviate or vibrate during the punching process. This embodiment punches three times, replaces the punching needle according to the shape and size of the spinneret hole before each punching, and performs modification after each punching, so that the surface roughness of the spinneret hole is ≤0.1um and the aperture size accuracy is ≤±0.001mm, which can solve the problem of easy breakage of the yarn and the spinning requirements of the parallel fiber in the spinning production. Compared with the standard of dimensional accuracy of ±0.002mm mentioned in the background technology, the method provided in the present application significantly improves the accuracy, thereby easily meeting the requirement. The single-use cycle of the manufactured spinneret can reach more than 20 days, which extends the number of times the spinneret is replaced. At the same time, the roughness of the spinneret hole of the manufactured spinneret is low, and the plate replacement and cleaning are simpler and easier, which reduces the labor intensity of the staff and reduces the labor time. The spinneret hole of the spinneret is in the hardening stage (strengthening stage) after multiple stamping, grinding and polishing. The strength of the material in the hole is higher than that of the traditional manufacturing process, and the working pressure used is higher, which makes the spinneret more adaptable and can work under higher working pressure.

[0083] In one embodiment, referring to Figure 1 and Figure 2 The step S122, removing the blank after the first punching from the automatic punching machine, and performing the first modification treatment on the blank comprises:

[0084] S1221, removing the blank after the first punching from the automatic punching machine, and cleaning the blank to remove impurities such as oil stains on the blank;

[0085] S1222, obtaining a shaping mold, and shaping the blank after the impurities are cleaned according to the shaping mold;

[0086] S1223, removing the shaped blank from the shaping mold and grinding the wire-exiting surface of the blank to ensure that the grinding of the wire-exiting surface meets the preset requirements;

[0087] S1224, high-pressure cleaning is performed on the ground blank to remove impurities such as abrasives on the blank.

[0088] Among them, in the early preparation process of production, multiple tests can be carried out, and the equipment used in the processing process can be debugged according to the surface roughness and dimensional accuracy of the blank during the test process to ensure that the produced spinneret meets the preset requirements.

[0089] In this embodiment, the press used is 800 tons. Specifically: the blank after the first punching is removed from the automatic punching machine, and the blank is cleaned of impurities to remove impurities such as oil stains on the blank. Then, the blank after impurity cleaning is shaped according to the shaping mold. At this time, the pressure value is 5MPa, and the holding time is 10s. Then, the shaped blank is removed from the shaping mold and the wire-out surface of the blank is ground for 8 hours to ensure that the grinding of the wire-out surface meets the first preset requirement. The rotation speed of the grinding equipment used is 20r / min, and the proportion of the abrasive used is 10%. Finally, the ground blank is high-pressure cleaned to remove impurities such as abrasives on the blank.

[0090] In one embodiment, referring to Figure 1 and Figure 2 The step S124, removing the blank after the second punching from the automatic punching machine, and performing a second modification process on the blank comprises:

[0091] S1241, removing the blank after the second punching from the automatic punching machine, and cleaning the blank to remove impurities such as oil stains on the blank;

[0092] S1242, grinding the wire outlet surface and the wire inlet surface of the blank after the impurities are cleaned, so as to ensure that the grinding of the wire outlet surface and the wire inlet surface meets the preset requirements;

[0093] S1243, high-pressure cleaning is performed on the ground blank to remove impurities such as abrasives on the blank.

[0094] In this embodiment, specifically: the blank after the second punching is removed from the automatic punching machine, the blank is cleaned for impurities to remove impurities such as oil stains on the blank, and then the wire outlet surface and wire inlet surface of the blank after impurity cleaning are ground for 7 hours to ensure that the grinding of the wire outlet surface and wire inlet surface meets the second preset requirement, the rotation speed of the grinding equipment used is 20r / min, the proportion of the abrasive used is 10%, and finally the ground blank is high-pressure cleaned to remove impurities such as abrasives on the blank.

[0095] In one embodiment, referring to Figure 1 and Figure 2 The step S125 of removing the blank after the third punching from the automatic punching machine and performing a third modification treatment on the blank comprises:

[0096] S1251, removing the blank after the third punching from the automatic punching machine, and cleaning the blank to remove impurities such as oil stains on the blank;

[0097] S1252, polishing the wire outlet surface and the wire inlet surface of the blank after the impurities are cleaned, so as to ensure that the polishing of the wire outlet surface and the wire inlet surface meets the preset requirements;

[0098] S1253, high-pressure cleaning is performed on the polished blank to remove impurities such as polishing materials on the blank.

[0099] In this embodiment, specifically: the blank after the third punching is removed from the automatic punching machine, the blank is cleaned for impurities to remove impurities such as oil stains on the blank, and then the wire outlet surface and wire inlet surface of the blank after impurity cleaning are polished for 7 hours to ensure that the polishing of the wire outlet surface and wire inlet surface meets the third preset requirement (roughness ≤ 0.1um), the rotation speed of the polishing equipment used is 15r / min, the proportion of polishing material used is 8%, and finally the polished blank is high-pressure cleaned to remove impurities such as polishing material on the blank.

[0100] In one embodiment, referring to Figure 1 and Figure 2 The step of cleaning the blank from impurities comprises:

[0101] Obtaining degreasing liquid, and placing the blank into a soaking tank containing the degreasing liquid and soaking for a first period of time;

[0102] Rinse the soaked blank with clean water of a preset temperature for a second period of time;

[0103] Putting the rinsed blank into an ultrasonic cleaning machine for cleaning for a third period of time;

[0104] The blank is taken out from the ultrasonic cleaning machine and placed in a drying box for drying.

[0105] In this embodiment, the power of the ultrasonic cleaning machine is 1.0 Hz, the drying temperature of the drying machine is 100° C., the drying time is 1 hour, and the degreasing liquid includes degreasing powder and degreasing medium.

[0106] In the first modification treatment, the ratio of degreasing powder is 20%. Specifically, the blank is placed in an immersion tank filled with the degreasing liquid and soaked for about 4 hours, then rinsed with water at a temperature of about 70°C for 30 minutes, then placed in an ultrasonic cleaning machine for cleaning for 60 minutes, and finally placed in a dryer for drying; in the second modification treatment, the ratio of degreasing powder is 10%. Specifically, the blank is placed in an immersion tank filled with the degreasing liquid and soaked for about 3 hours, then rinsed with water at a temperature of about 60°C for 30 minutes, then placed in an ultrasonic cleaning machine for cleaning for 60 minutes, and finally placed in a dryer for drying; in the third modification treatment, the ratio of degreasing powder is 15%. Specifically, the blank is placed in an immersion tank filled with the degreasing liquid and soaked for about 2 hours, then rinsed with water at a temperature of about 60°C for 30 minutes, then placed in an ultrasonic cleaning machine for cleaning for 65 minutes, and finally placed in a dryer for drying.

[0107] In one embodiment, referring to Figure 1 and Figure 2 The step of high-pressure cleaning the ground / polished blank comprises:

[0108] High-pressure washing is performed on the ground / polished blank for a fourth period of time;

[0109] Adjusting the power of the ultrasonic cleaning machine, placing the workpiece after high-pressure washing into the ultrasonic cleaning machine for cleaning for a fifth period of time;

[0110] The blank is taken out from the ultrasonic cleaning machine and placed in the drying box for drying.

[0111] In this embodiment, the drying temperature of the dryer is 100° C. and the drying time is 1 hour.

[0112] In the first modification treatment, specifically, the ground blank is subjected to high-pressure washing for 30 minutes, then placed in an ultrasonic cleaning machine with a power of 1.0 Hz for cleaning for 30 minutes, and finally placed in a dryer for drying; in the second modification treatment, the ground blank is subjected to high-pressure washing for 30 minutes, then placed in an ultrasonic cleaning machine with a power of 1.0 Hz for cleaning for 30 minutes, and finally placed in a dryer for drying; in the third modification treatment, the polished blank is subjected to high-pressure washing for 30 minutes, then placed in an ultrasonic cleaning machine with a power of 2.0 Hz for cleaning for 50 minutes, and finally placed in a dryer for drying.

[0113] In one embodiment, referring to Figure 1 and Figure 2 The steps of obtaining the sheet material, pre-treating the sheet material, and obtaining the blank of the spinneret include:

[0114] S111, obtaining a plate, and cutting the plate into a preset size;

[0115] S112, obtaining a stamping die, and stamping the blanked sheet material according to the stamping die;

[0116] S113, obtaining a trimming die, and trimming the blank after stamping according to the trimming die;

[0117] S114, obtaining a shaping die, and shaping the blank after trimming according to the shaping die to obtain a blank of a spinneret.

[0118] Among them, the plastic surgery mold obtained in this embodiment is the same as the plastic surgery mold obtained in the above embodiment.

[0119] The press used in this embodiment is 800 tons, wherein the pressure value during stamping is 30MPa, and the holding time is 2min; the pressure value during trimming is 15MPa, and the holding time is 10s; the pressure value during shaping is 15MPa, and the holding time is 30s; specifically, obtain the plate, use laser or other methods to cut it to a preset size (the size required for the spinneret product), and at the same time, in order to facilitate the next process, it is necessary to grind and wipe the edge of the plate after cutting, and then put the plate on the punch press and use the corresponding stamping die to punch the plate according to the structure of the product. At this time, the pressure value of the punch press is 30MPa, and the holding time is 2min. After stamping, it is placed in the corresponding trimming die for trimming. At this time, the pressure value is 15MPa, and the holding time is 10s. Finally, the trimmed plate is placed in the corresponding shaping die for shaping to obtain a spinneret blank.

[0120] Second, refer to Figure 3 and Figure 4 The present invention provides a lyocell spinneret, which is obtained by the method described in any one of the first aspects, the spinneret is annular, and is provided with spinneret holes, and the inner surface roughness of the spinneret holes is ≤0.1um.

[0121] The material of the lyocell spinneret is stainless steel or tantalum. The spinneret manufactured by the method described in any one of the first aspects has a dimensional accuracy of ≤±0.001 mm and a greatly improved hardness. Figure 3 As shown, the micropores of the Lyocell spinneret are arranged on the wire inlet surface 1 and the wire outlet surface 2. The wire inlet surface 1 is parallel to the wire outlet surface 2, and its outer diameter is φA, the inner diameter is ΦB, the total height is h, the thickness of the bottom wire inlet surface and the wire outlet surface is t, the micropore distribution area is D, and the angle between the straight cylinder wall and the wire inlet surface is C, wherein 30°≤C≤90°, 0.2mm≤t≤20 mm.

[0122] In one embodiment, the material of the Lyocell spinneret is stainless steel, with a thickness t of 1.5 mm, an outer diameter φA of 650 mm, an inner diameter ΦB of 550 mm, the number of micropores (spinnerets) ranging from tens of thousands to hundreds of thousands, the inner surface roughness of the spinnerets ≤0.1 um, the aperture size accuracy of φ0.095±0.001 mm, and the working pressure of the Lyocell spinneret ≥0.5 MPa.

[0123] Specifically, a stainless steel lyocell spinneret with a thickness of 1.5 mm is manufactured, a stainless steel sheet is obtained, and the stainless steel sheet is pre-processed into a circular spinneret blank with an outer diameter of 650 mm and an inner diameter of 550 mm; a first punching stroke of 1.5 mm and a first punching frequency of 1 second / hole are obtained, and the blank is punched for the first time according to the first punching stroke and the first punching frequency, and then the blank after the first punching is subjected to a first modification treatment; a second punching stroke of 1.8 mm and a second punching frequency of 0.5 second / hole are obtained, and a first punching stroke of 1.5 mm and a first punching frequency of 1 second / hole are obtained, and a first modification treatment is performed on the blank after the first punching; a second punching stroke of 1.8 mm and a second punching frequency of 0.5 second / hole are obtained, and a first punching stroke of 1.5 mm and a second punching frequency of 0.5 second / hole are obtained, and a first punching stroke of 1.5 mm and a first punching frequency of 1 second / hole are obtained, and a first trimming treatment is performed on the blank after the first trimming treatment; a second punching stroke of 1.8 mm and a second punching frequency of 0.5 second / hole are obtained, and a first trimming treatment is performed on the blank after the first trimming treatment; a first trimming treatment is performed on the blank after the first trimming treatment; and a first trimming treatment is performed on the blank after the first trimming treatment. The blank after the first modification treatment is punched for the second time, and then subjected to the second modification treatment; the punching force is 20N, and the third punching frequency is 0.5 seconds / hole. According to the punching force and the third punching frequency, the blank after the second modification treatment is punched for the third time, and then subjected to the third modification treatment to obtain the Lyocell spinneret with a thickness of 1.5 mm, an inner surface roughness of the spinneret hole ≤0.1 um, and an aperture size accuracy of ≤±0.001 mm as described in this embodiment (the specific processing process refers to any embodiment in the first aspect, and no further details are given here).

[0124] The above-mentioned lyocell spinneret has a simple structure and adopts a circular ring structure. The inner and outer flanges are positioned and stressed. Compared with the circular lyocell spinneret, the middle of the ring structure can provide more structural support, making it not easy to deform. Therefore, the lyocell spinneret can be arranged with tens of thousands to hundreds of thousands of holes under different working pressures and working areas; because it adopts sheet material blanking and stamping processing, the product processing cost is low, the production efficiency is high, the quality consistency is good, and the number of micropores is large, which meets the requirements of large-tonnage spinning machines and improves the spinning efficiency of the spinning machine; because the lyocell spinneret is prepared by the processing method described in any one of the first aspects, the surface roughness of the hole is ≤0.1um, the size accuracy of the spinneret hole is ≤±0.001mm, the roughness inside the hole is low, the size accuracy is high, and it is not easy to cause fiber adhesion and uneven thickness of the wire, wire winding, and easy breakage.

[0125] The inner surface roughness and dimensional accuracy of the spinneret hole can be detected by microscopy. The inner surface roughness of the spinneret hole in the spinneret hole disclosed in the present application can be ≤0.1um, and the dimensional accuracy of the spinneret hole is ≤±0.001mm. As an embodiment, at an operating temperature of 150°C or less, a circular spinneret with specifications of ф556.6xф476.3x70380xф0.095, 70380 holes, an aspect ratio of 2.5:1, and a circular hole shape is detected. It is detected that the hole entrance tolerance of the spinneret is ±0.01mm, the hole diameter tolerance is ±0.001mm, the hole roundness is <0.001mm, the inner surface roughness of the reverse hole is ≤Ra0.1, the surface roughness of the spinneret is ≤Ra0.1, the prismatic hole spacing of the hole spacing is 0.67mm, the straight hole length tolerance is ±0.01mm, and the maximum pressure resistance in the pressure resistance is 8MPa.

[0126] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the indications of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the steps or stages in other steps.

[0127] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0128] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0129] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for processing a spinneret, characterized in that: The processing method of the spinneret comprises: Obtaining a sheet material, and pre-treating the sheet material to obtain a blank of the spinneret; The blank is mounted on an automatic punching machine, and the same position of the blank is punched at least 3 times. After each punching of the blank is completed, the blank is modified to obtain the spinneret, wherein the first punching stroke during the first punching is equal to the thickness of the spinneret, the first punching stroke and the first punching frequency are obtained, the blank is punched for the first time according to the first punching stroke and the first punching frequency, the blank after the first punching is removed from the automatic punching machine, and the blank is modified for the first time to form a through hole; the second punching stroke during the second punching is greater than the thickness of the spinneret, and the diameter of the punching needle during the second punching is less than the diameter of the straight hole of the spinneret in the spinneret, and the spinneret is obtained. The second punching stroke and the second punching frequency, according to the second punching stroke and the second punching frequency, the blank is punched for the second time, the blank after the second punching is removed from the automatic punching machine, and the blank is modified for the second time; the diameter of the punching needle during the third punching is equal to the diameter of the straight hole of the spinneret in the spinneret, the punching force and the third punching frequency are obtained, the blank is punched for the third time according to the punching force and the third punching frequency, the blank after the third punching is removed from the automatic punching machine, and the blank is modified for the third time, the inner surface roughness of the spinneret hole after the third punching is ≤0.1um, and the spinneret hole size accuracy is ≤±0.001mm.

2. The processing method according to claim 1, characterized in that: The first punching stroke is 1.5 mm, the first punching frequency is 1 second / hole, the second punching stroke is 1.8 mm, the second punching frequency is 0.5 second / hole, the punching force is 20 N, and the third punching frequency is 0.5 second / hole.

3. The processing method according to claim 1, characterized in that: The step of removing the blank after the first punching from the automatic punching machine and performing a first modification treatment on the blank comprises: The blank after the first punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank; Obtaining a shaping mold, and shaping the blank after the impurities are cleaned according to the shaping mold; The shaped blank is removed from the shaping mold and the wire-exiting surface of the blank is ground to ensure that the grinding of the wire-exiting surface meets the preset requirements; The ground blank is cleaned under high pressure to remove the abrasive impurities on the blank.

4. The processing method according to claim 1, characterized in that: The step of removing the blank after the second punching from the automatic punching machine and performing a second modification treatment on the blank comprises: The blank after the second punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank; Grinding the wire-out surface and the wire-in surface of the blank after the impurities have been cleaned, so as to ensure that the grinding of the wire-out surface and the wire-in surface meets the preset requirements; The ground blank is cleaned under high pressure to remove the abrasive impurities on the blank.

5. The processing method according to claim 1, characterized in that: The step of removing the blank after the third punching from the automatic punching machine and performing a third modification treatment on the blank comprises: The blank after the third punching is taken out from the automatic punching machine, and the blank is cleaned of impurities to remove oil stains and impurities on the blank; Polishing the wire outlet surface and the wire inlet surface of the blank after the impurities are cleaned to ensure that the polishing of the wire outlet surface and the wire inlet surface meets the preset requirements; The polished blank is cleaned under high pressure to remove polishing material impurities on the blank.

6. The processing method according to any one of claims 3 to 5, characterized in that: The step of cleaning the blank from impurities comprises: Obtaining degreasing liquid, and placing the blank into a soaking tank containing the degreasing liquid and soaking for a first period of time; Rinse the soaked blank with clean water of a preset temperature for a second period of time; Putting the rinsed blank into an ultrasonic cleaning machine for cleaning for a third period of time; The blank is taken out from the ultrasonic cleaning machine and placed in a drying box for drying.

7. The method for processing a spinneret according to claim 1, characterized in that: The steps of obtaining a sheet material, pre-treating the sheet material, and obtaining a blank of the spinneret include: Obtaining a plate, and cutting the plate into a preset size; Obtain a stamping die, and stamp the blanked sheet material according to the stamping die; Obtain a trimming die, and perform trimming on the blank after stamping according to the trimming die; A shaping die is obtained, and the blank after trimming is shaped according to the shaping die to obtain a blank of a spinneret.

8. A lyocell spinneret, characterized in that: The spinneret is prepared by the method described in any one of claims 1 to 7, the spinneret is annular, and is provided with spinneret holes, the inner surface roughness of the spinneret holes is ≤0.1um, and the size accuracy of the spinneret holes is ≤±0.001mm.

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