A production process for elastic metal gasket

Abstract

The present invention discloses a production process for elastic metal gaskets, comprising the following steps: S1: profile cutting: cutting the gasket profile according to preset parameters, wherein the cutting features include the gasket outer circle, the gasket inner circle, the stress relief hole, and the stress relief arc; S2: heat treatment: comprising S2.1: quenching and heating; S2.2: salt bath cooling; S3: pressurization: shaping the gasket using a press and a mold, wherein the angle between the line connecting the gasket outer circle and the gasket inner circle and the horizontal plane is less than 30 degrees; S4: tempering: tempering the formed gasket to increase the hardness, wherein the hardness of the gasket after tempering is HRC35-46; S5: grinding: removing the black scale generated on the gasket surface after tempering by grinding, and grinding to a preset gasket thickness parameter; S6: sharp angle passivation: passivating the gasket edge; S7: quality inspection; and S8: packaging and storage. The inclination angle of the elastic metal gasket is controlled by pressurization, thereby ensuring that the elastic metal gasket maintains its elasticity over a long period of time.

Description

Technical Field

[0001] The invention relates to the technical field of gasket manufacturing, in particular to a production process of elastic metal gaskets. Background Art

[0002] In the era of rapid lithium battery development, demand for thin film slitting machines (units) for segmenting lithium battery thin film is increasing. In addition to the lithium battery industry, the papermaking industry also requires slitting machines (units). The slitting machine's main shaft is equipped with multiple circular blades, separated by elastic metal spacers to prevent slippage and prevent the blades from slipping. The elastic metal spacers prevent the blades from slipping during the cutting process due to increased resistance caused by blunt blades.

[0003] For example, the “Processing Technology for Elastic Gaskets” disclosed in the Chinese patent literature, with the application number “CN201410762027.4”, includes the following steps: 1) annealing of raw materials; 2) blanking and forming: (1) blanking according to the size of the elastic gasket, machining, and processing using a shearing machine; (2) then using special upper and lower molds to press and form the workpiece under a press; 3) quenching after forming: (1) the quenching heating equipment is a medium-temperature box-type resistance furnace, and the same method and heating temperature as annealing heating must be used; after heating, the iron box is taken out of the furnace after insulation, the iron box cover is opened, and the workpiece is taken out and put into oil for cooling.

[0004] In the above scheme, the process method is simple and can improve the performance of the elastic gasket and increase its service life; however, there is still the problem that the elastic gasket's elasticity retention ability is not ideal and the elasticity decreases over time. This application proposes a production process for elastic metal gaskets to improve the accuracy, elasticity and fastening effect of elastic metal gaskets. Summary of the Invention

[0005] The first invention purpose of the present invention is to address the problem of unsatisfactory elastic retention ability of elastic metal gaskets in the prior art. The present invention provides a production process for elastic metal gaskets, which controls the inclination angle of the elastic metal gasket by applying pressure and adjusts the hardness of the elastic metal gasket by combining with the tempering process, thereby achieving long-term elasticity of the elastic metal gasket and good effect of repeated use.

[0006] The second object of the present invention is to solve the problem of adverse indentation effects of elastic metal gaskets on jigs during use.

[0007] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0008] A production process for elastic metal gaskets comprises the following steps:

[0009] S1: Cutting profile: Cutting the gasket profile according to preset parameters. The cutting features include the gasket outer circle, gasket inner circle, stress relief hole and stress relief arc.

[0010] S2: Heat treatment: including S2.1 and S2.2:

[0011] S2.1: Quenching heating;

[0012] S2.2: Salt bath cooling;

[0013] S3: Pressurization molding: The gasket is molded using a press machine in conjunction with a mold, wherein the angle between the line connecting the outer circle of the gasket and the inner circle of the gasket and the horizontal plane is less than 30°;

[0014] S4: Tempering: Temper the formed gasket to increase its hardness. The hardness of the gasket after tempering is HRC35~46;

[0015] S5: Grinding treatment, removing the black skin on the surface of the gasket after tempering by grinding, and grinding to the preset gasket thickness parameter;

[0016] S6: Sharp corner passivation: passivation treatment is performed on the edge of the gasket;

[0017] S7: Quality inspection;

[0018] S8: Packing and storage.

[0019] In this solution, the outline of the elastic metal gasket is first cut by any method that meets the preset processing accuracy, including laser cutting, to obtain the basic outline of the cut elastic metal sheet, including the outer circle of the gasket, the inner circle of the gasket, the stress relief hole, and the stress relief arc. The outer circle of the gasket and the inner circle of the gasket are concentric circles, and the concentricity is within 0.05mm, so as to ensure that the internal and external deformation of the elastic metal gasket is controlled within the preset range during the subsequent processing. Then, the hardness and toughness of the elastic metal sheet are improved by quenching and adding a salt bath. The gasket is shaped by a press to make it an inward-inclined ring sheet, and the inclination angle is controlled within 30°. After testing, it is found that the use effect is poor when it exceeds 30°, and the production process is also prone to defects such as cracks and fractures. After pressing and forming, the hardness of the elastic metal sheet is further improved by tempering to meet the use requirements and have the ability to continuously replicate. The gaskets that meet the required hardness are surface treated and the surface and sharp edges of the gaskets are ground to ensure that their thickness and passivation meet the requirements of use. Finally, the gaskets are tested for basic parameters such as end face runout, inclination angle, inner diameter, outer diameter, thickness, etc. to ensure that they meet the specifications before being stored in the warehouse.

[0020] Preferably, the cutting method in step S1 is laser cutting. The advantages of laser cutting are high processing precision and effective reduction of burrs on the edges of the elastic metal gasket, which are important prerequisites for the quality of the gasket and its subsequent elastic reset capability.

[0021] Preferably, between steps S1 and S2, step S1.1 is further included: deburring the gasket profile cut and formed in step S1. The deburring step is necessary. Even if laser cutting is used, it is still necessary to ensure that the burrs are completely removed, otherwise it will affect the process and cause quality and precision problems.

[0022] Preferably, step S2.3 is further included between steps S2 and S3: cleaning the surface of the gasket after heat treatment. The main purpose of cleaning is to remove foreign matter attached to the surface of the quenched gasket to ensure that the subsequent pressing process will not damage the gasket due to the presence of foreign matter. The cleaning step needs to be controlled within 5 seconds to prevent crack defects caused by pressurization of the tablet press after the gasket cools down or difficulty in correcting the gasket tilt angle.

[0023] Preferably, between steps S3 and S4, step S3.1 is further included: cleaning the formed gasket. The cleaning step is to completely clean the formed gasket to ensure that the residual material, dust and impurities thereon are washed away, so as to prevent the above impurities from affecting the gasket quality during the subsequent tempering process.

[0024] Preferably, the temperature range of quenching heating in step S2.1 is 810° C. to 820° C. The determination of the quenching temperature mainly considers sufficient austenitization of the material while preventing the growth of austenite grains. This application uses commonly used 45 steel as the material, so this temperature range is selected for processing.

[0025] Preferably, the tempering temperature in step S4 is in the range of 350°C to 400°C, and the tempering time is 4 to 7 hours. The tempering time is determined by the furnace load, and the furnace load is positively correlated with the tempering time, thereby eliminating the residual stress generated during the quenching of the gasket and preventing deformation and cracking.

[0026] Preferably, in step S2.2, a salt bath tank is used for salt bath cooling, and the salt bath temperature is 200° C. to 210° C. The salt bath cooling method easily obtains a high hardness and a smooth surface, and is less likely to produce soft spots that cannot be hardened, thereby ensuring that the gasket hardness is uniform and the surface roughness meets the requirements before pressurization, and avoiding local wrinkling or cracking caused by uneven hardness during the molding process through the mold.

[0027] Preferably, the mold in step S3 includes an upper mold and a lower mold, and the outer edge of the cavity between the upper mold and the lower mold is provided with a ring groove, the ring groove includes an upper half groove provided in the upper mold and a lower half groove provided in the lower mold, and the upper half groove and the lower half groove are combined to form a water drop shape. The upper half groove and the lower half groove can form a reinforcement ring on the outer edge of the upper surface and the lower surface of the gasket respectively when the gasket is formed. The reinforcement ring has both reinforcement and limiting functions, which can ensure that the gasket forms a ball-like outer edge without a tip after the passivation in step S6 is completed, and ensure that the elastic metal gasket will not cause damage to other gaskets due to sharp edges; it can also clamp and shape the gasket with an angle formed by the inner and outer circles after the entire molding through the closed ring formed by the cross-sectional area reinforcement, reduce the speed of its gradual deformation with the extension of use time, and extend the time it maintains the molded shape, thereby improving the service life and working stability of the gasket. Under the premise that the internal structure is not seriously changed, the reinforcement ring can improve the rebound performance of the gasket.

[0028] Therefore, the present invention has the following beneficial effects:

[0029] (1) The inclination angle of the elastic metal gasket is controlled by applying pressure, and the hardness of the elastic metal gasket is adjusted by the tempering process, so that the elastic metal gasket can maintain its elasticity for a long time and has a good effect of repeated use;

[0030] (2) Grinding is used to process the surface and sharp edges of the gasket so that its thickness and passivation degree can meet the use requirements. Grinding the surface can remove the black skin produced by the tempering process and correct the thickness of the gasket. Grinding the sharp edges of the gasket prevents the gasket from being deformed and affecting its performance when it abuts against adjacent gaskets due to external forces during use, thereby improving the safety between gaskets.

[0031] (3) The hardness and toughness of the elastic metal sheet are improved by quenching and salt bath, so that it meets the premise of obtaining long-term elastic recovery ability, thereby ensuring the completion of subsequent processes;

[0032] (4) The structure and resilience of the gasket are enhanced by using the reinforcement rings formed separately on both sides of the gasket in combination with the non-Newtonian fluid structure, thereby obtaining a stable gasket that meets the needs of long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention.

[0034] Figure 2 It is a side sectional view of the present invention.

[0035] Figure 3 for Figure 2 A is a partial enlarged view of Example 2.

[0036] In the figure: 1 elastic metal gasket, 2 upper reinforcement ring, 3 lower reinforcement ring, 11 gasket outer circle, 12 gasket reference auxiliary line, 13 gasket inner circle, 14 stress relief hole, 15 stress relief arc, 16 gasket upper surface, 17 gasket lower surface. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0038] Example 1

[0039] like Figure 1 , as shown in 2, the production process of elastic metal gaskets includes the following steps:

[0040] Laser cutting is used to create the basic outline of the elastic metal sheet 1, including the gasket outer circle 11, the gasket inner circle 13, the stress relief holes 14, and the stress relief arcs 15. The gasket outer circle 11 and the gasket inner circle 13 are concentric, with a concentricity within 0.05 mm. The stress relief holes and stress relief arcs work together to eliminate internal stress generated during processing, preventing gasket deformation or performance degradation caused by stress. Laser cutting produces cutting burrs, which require surface deburring. The laser-cut gasket has a hardness of less than HRC 10, is relatively soft, and lacks sufficient elastic recovery. Heat treatment is required to improve its hardness and toughness. The heat treatment process includes heat treatment quenching heating, heat treatment salt bath cooling, cleaning, tablet press pressurization, cleaning, and tempering. The heat treatment quenching heating temperature must be controlled between 810°C and 820°C, and the salt bath temperature must be controlled between 200°C and 210°C. Cleaning involves using a cleaning cloth or brush to remove foreign matter from the surface of the quenched gasket, ensuring that the tablet press press process does not press foreign matter into the gasket and cause damage. It is important to note that the cleaning step should be controlled within 5 seconds to prevent cracks or difficulty correcting the gasket's tilt angle when the tablet press press presses again after the gasket cools.

[0041] The tablet press uses a hydraulic press for the pressurization step, and uses molds at the upper and lower levels to control the gasket inclination angle a. The molds are divided into an upper mold and a lower mold, and the upper mold corresponds to the lower mold and is in an upwardly inclined structure. The control of the gasket inclination angle a depends on the inclination angles of the upper mold and the lower mold. The tablet press needs to last for 10 to 15 seconds to allow the gasket to deform sufficiently. The gasket inclination angle is less than 30°. If it exceeds 30°, the use effect is not good, and the production process is also prone to defects such as cracks and breakage. The duration of the tempering step is set depending on the furnace load, the temperature is set at 350 to 400°C, and the time is controlled at 4 to 7 hours. The hardness of the gasket after tempering is in the range of HRC35 to 46.

[0042] The surface grinding is used to remove the black skin on the upper surface 16 and the lower surface 17 of the gasket after heat treatment, and obtain a gasket with a preset thickness size T. Sharp angle passivation mainly blunts the sharp angles of the gasket edge by grinding, so as to prevent the adjacent gaskets from being deformed or damaged due to sharp edges when they are in contact with adjacent gaskets due to external forces during use; and to prevent the elastic metal gasket from being pressed into other ordinary gaskets due to the large pressure caused by the small contact surface, thereby affecting the surface accuracy of the ordinary gaskets. After the gaskets are processed by the above process, they are sent for quality inspection. During the inspection, the gasket reference auxiliary line 12 is used as the positioning reference. The inspection data includes but is not limited to the end face runout, tilt angle a, inner diameter, outer diameter, and thickness. The products are packaged and put into storage after passing the inspection.

[0043] In this embodiment, when technicians are producing elastic metal gaskets, in order to avoid wrinkling of the gaskets during the pressing process, they need to pay attention to the following: ensure that the surface of the metal gasket is flat, without depressions or protrusions, and also ensure that the surface of the mold is flat, without damage or depressions. Control the heating temperature. Too high a temperature can easily cause the metal to soften excessively, resulting in deformation and wrinkling. Too low a temperature will make it difficult to press the metal gasket into shape. It is necessary to find a suitable heating temperature based on experiments. Control the pressure. Excessive pressure will cause the metal gasket to deform, and too little pressure will prevent the metal gasket from being pressed into shape. It is necessary to find a suitable pressure value.

[0044] The pressure should be increased gradually and maintained uniformly during the pressurization process. Do not apply or reduce the pressure suddenly. The good ductility of the metal material after heating is used to ensure that the gasket forms a ring structure with a high outer surface and a low inner surface during the pressurization process, thereby achieving stable elastic reset ability.

[0045] In this embodiment, during the processing of the metal gasket, when a hydraulic press is used for pressure forming, a forming guide plate can be used to assist the upper and lower molds in processing, ensuring that the metal gasket can be extended and deformed within the contour limit of the forming guide plate during the molding process, thereby generating an inclination angle a while ensuring that the concentricity between the outer circle of the gasket and the inner circle of the gasket does not increase, changing the shape of the elastic metal gasket in its natural state, thereby obtaining a long-lasting rebound ability and reducing the problem of decreased elastic recovery ability over time.

[0046] Example 2

[0047] Different from Example 1, Figure 3 As shown, in this embodiment, the mold in step S3 includes an upper mold and a lower mold, and a ring groove is provided on the outer edge of the cavity between the upper mold and the lower mold. The ring groove includes an upper half groove provided in the upper mold and a lower half groove provided in the lower mold. The upper half groove and the lower half groove are combined to form a non-Newtonian fluid structure. The upper half groove and the lower half groove can form an upper half reinforcement ring 2 and a lower half reinforcement ring 3 on the outer edges of the upper surface and the lower surface of the gasket respectively when the gasket is formed. The combination of the two half reinforcement rings can form a non-Newtonian fluid structure, which imitates the non-Newtonian fluid structure and can effectively utilize the interaction force between atoms to resist high impact force. In the actual slow deformation process of the gasket, it can adapt to the changing trend of the gasket and deform synchronously; therefore, the reinforcement ring has both reinforcement and limiting functions, which can ensure that the gasket forms a ball-like outer edge without a tip after the passivation in step S6 is completed, and ensure that the elastic metal gasket will not cause damage to other gaskets due to sharp edges; it can also clamp and shape the gasket with an angle formed by the inner and outer circles after the entire molding through the closed reinforcement ring formed by the cross-sectional area reinforcement, reduce the speed of its gradual deformation with the extension of use time, and extend the time it maintains the molded shape, thereby improving the service life and working stability of the gasket. Under the premise that the internal structure does not change seriously, the reinforcement ring can improve the rebound performance of the gasket.

[0048] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and description of the present invention, the technical features of the present invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative work. Therefore, these embodiments that are not described in detail in the present invention should also be regarded as specific embodiments of the present invention and within the scope of protection of the present invention.

Claims

1. A production process for elastic metal gaskets, characterized in that: The following steps are involved: S1: Cutting profile: Cutting the gasket profile according to preset parameters. The cutting features include the gasket outer circle, gasket inner circle, stress relief hole and stress relief arc. S2: Heat treatment: including S2.1 and S2.2: S2.1: Quenching heating; S2.2: Salt bath cooling; S3: Pressurization molding: The gasket is molded using a press machine in conjunction with a mold, wherein the angle between the line connecting the outer circle of the gasket and the inner circle of the gasket and the horizontal plane is less than 30°; the press machine and the mold include a lower mold and a lower mold, and a ring groove is provided on the outer edge of the cavity between the upper mold and the lower mold, and the ring groove includes an upper half groove provided in the upper mold and a lower half groove provided in the lower mold; S4: Tempering: Temper the formed gasket to increase its hardness. The hardness of the gasket after tempering is HRC35~46; S5: Grinding treatment, removing the black skin on the surface of the gasket after tempering by grinding, and grinding to the preset gasket thickness parameter; S6: Sharp corner passivation: passivation treatment is performed on the edge of the gasket; S7: Quality inspection; S8: Packing and storage.

2. The production process of an elastic metal gasket according to claim 1, characterized in that: The cutting method in step S1 is laser cutting.

3. The production process of an elastic metal gasket according to claim 1, characterized in that: Between steps S1 and S2 there is also included step S1.1: removing burrs based on the gasket profile cut and formed in S1.

4. The production process of an elastic metal gasket according to claim 1, characterized in that: The temperature range of the quenching heating in step S2.1 is 810°C to 820°C.

5. The production process of an elastic metal gasket according to claim 1, characterized in that: In step S2.2, a salt bath tank is used for salt bath cooling, and the salt bath temperature is 200°C to 210°C.

6. The production process of an elastic metal gasket according to claim 1, characterized in that: Between steps S2 and S3 there is also included step S2.3: cleaning the surface of the gasket after the heat treatment is completed.

7. The production process of an elastic metal gasket according to claim 1, characterized in that: Between steps S3 and S4 there is also step S3.1: cleaning the formed gasket.

8. The production process of an elastic metal gasket according to claim 1, characterized in that: In step S4, the tempering temperature range is 350° C. to 400° C., and the tempering time is 4 to 7 hours.

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