A method of cleaning threaded blind holes

Abstract

The present application belongs to the technical field of workpiece cleaning, and discloses a threaded blind hole cleaning method, which comprises the following steps: first, placing the workpiece into an ultrasonic cleaning device for ultrasonic cleaning; then, using cavitation effect to strip and disperse the residual debris, dirt and the like on the surface of the workpiece and in the threaded blind hole; and finally, using a spray cleaning device to flush the threaded blind hole, wherein the flushing pressure of the spray cleaning device is 0.35 MPa to 0.7 MPa, which can not only fully flush the threaded blind hole and remove the pollutants in the threaded groove, but also make the flushed pollutants flow out of the threaded blind hole along with the water flow, effectively avoiding the situation that the flushed pollutants are squeezed and accumulated at the bottom of the threaded blind hole, thus being convenient, fast, time-saving and labor-saving. Finally, the workpiece is dried by using a drying device to remove the residual moisture on the surface of the workpiece and the inner wall of the threaded blind hole, thereby avoiding the oxidation and corrosion of the workpiece caused by the adhesion of moisture and ensuring the quality of the workpiece.

Description

Technical Field

[0001] This invention relates to the field of workpiece cleaning technology, and in particular to a method for cleaning threaded blind holes. Background Technology

[0002] In the manufacturing fields of machinery, semiconductor processing, and precision instruments, threaded blind holes are a common structural form widely used in critical parts such as fixing, connecting, and sealing. Their cleanliness directly affects the assembly accuracy, sealing performance, and connection reliability of the product. A threaded blind hole consists of a closed structure at the bottom and a helical thread groove on the inner wall. Its unique structure and narrow space make it highly susceptible to the accumulation of oil and solid impurities during processing. If these contaminants are not removed promptly, they can lead to quality defects and safety risks.

[0003] Due to the unique structure of threaded blind holes, their cleaning difficulty is far greater than that of ordinary through holes and flat surfaces. Currently, commonly used cleaning methods include manual cleaning, high-pressure water washing, and ultrasonic cleaning. Manual cleaning involves operators using brushes, hooks, and other tools to clean deep into the blind hole, which is inefficient, labor-intensive, and produces poor cleaning results. High-pressure water washing uses the impact force of a high-pressure water jet to remove residue, and while effective at removing large particles of impurities on the surface, it has limited effectiveness against oil stains and tiny impurities within the grooves. Furthermore, the high-pressure water flow tends to compress debris at the bottom of the blind hole, preventing it from being effectively rinsed out. Ultrasonic cleaning utilizes the cavitation effect of ultrasound to generate high-pressure micro-jet streams that impact residue within the blind hole. However, the formation of standing waves at the bottom of the blind hole due to sound wave reflection causes the cleaning energy to attenuate, preventing a thorough cleaning of the blind hole.

[0004] Therefore, there is an urgent need for a method for cleaning thread blind holes that is both efficient and effective. Summary of the Invention

[0005] The purpose of this invention is to provide a method for cleaning blind holes in threads, so as to solve the problems of poor cleaning effect and low cleaning efficiency in existing methods for cleaning blind holes in threads.

[0006] To achieve this objective, the present invention adopts the following technical solution: A method for cleaning blind holes in threads is provided, for cleaning blind holes in threads drilled in a workpiece, comprising the following steps: S1: Place the workpiece into an ultrasonic cleaning device for ultrasonic cleaning; S2: Remove the workpiece and use a spray cleaning device to flush the threaded blind holes of the workpiece. The flushing pressure of the spray cleaning device is 0.35MPa~0.7MPa. S3: Dry the workpiece using a drying device.

[0007] As an alternative method for cleaning blind holes in threads, the cleaning agent in the ultrasonic cleaning equipment is MICRO-90.

[0008] As an optional method for cleaning blind holes in threads, the ratio of the cleaning agent to water is 1:200.

[0009] As an optional method for cleaning blind holes in threads, the ultrasonic cleaning temperature is 55±5℃.

[0010] As an optional method for cleaning blind holes in threads, the ultrasonic cleaning time is 5 min to 10 min.

[0011] As an optional solution for cleaning blind holes in threads, the spraying equipment includes a water supply pipe and a nozzle, wherein the nozzle is detachably disposed at one end of the water supply pipe and connected to the water supply pipe; The nozzle has a length of 35mm to 50mm and has an outlet and an inlet. The diameter of the outlet is less than 1.2mm.

[0012] As an alternative to the thread blind hole cleaning method, the inner diameter of the nozzle gradually decreases along the direction from the inlet to the outlet.

[0013] As an alternative to the thread blind hole cleaning method, the nozzle is provided with a regulating valve, which can regulate the water flow rate in the nozzle.

[0014] As an alternative to the thread blind hole cleaning method, the regulating valve is provided with an operating part.

[0015] As an alternative to the threaded blind hole cleaning method, a joint is provided between the water supply pipe and the nozzle.

[0016] The beneficial effects of this invention are: This invention provides a method for cleaning blind holes in threads. First, the workpiece is placed in an ultrasonic cleaning device for ultrasonic cleaning. The cavitation effect is used to peel off and disperse residual debris and dirt on the workpiece surface and inside the blind holes. Then, a spray cleaning device is used to rinse the blind holes. The rinsing pressure of the spray cleaning device is 0.35MPa~0.7MPa, which not only thoroughly rinses the blind holes and removes contaminants from the thread grooves, but also allows the rinsed contaminants to flow out with the water flow, effectively preventing the contaminants from being squeezed and accumulated at the bottom of the blind holes. This method is convenient, quick, and saves time and labor. Finally, a drying device is used to dry the workpiece to remove residual moisture from the workpiece surface and the inner wall of the blind holes, preventing oxidation and corrosion caused by moisture adhesion and ensuring workpiece quality. Attached Figure Description

[0017] Figure 1This is a flowchart of the thread blind hole cleaning method provided in the specific embodiments of the present invention; Figure 2 This is a front view of the spray washing equipment provided in the specific embodiments of the present invention; Figure 3 This is a schematic diagram of the nozzle structure provided in a specific embodiment of the present invention.

[0018] In the picture: 1. Spraying equipment; 11. Water supply pipe; 12. Nozzle; 121. Water outlet; 122. Water inlet. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a method for cleaning threaded blind holes. Threaded blind holes consist of a closed structure at the bottom of the blind hole and a spiral thread groove on the inner wall. Due to their special structure and narrow space, they are prone to retaining oil and solid impurities during processing. If these contaminants are not removed in time, they will cause quality problems and safety risks.

[0024] Due to the unique structure of threaded blind holes, their cleaning difficulty is far greater than that of ordinary through holes and flat surfaces. Currently, commonly used cleaning methods include manual cleaning, high-pressure water washing, and ultrasonic cleaning. Manual cleaning involves operators using brushes, hooks, and other tools to clean deep into the blind hole, which is inefficient, labor-intensive, and produces poor cleaning results. High-pressure water washing uses the impact force of a high-pressure water jet to remove residue, and while effective at removing large particles of impurities on the surface, it has limited effectiveness against oil stains and tiny impurities within the grooves. Furthermore, the high-pressure water flow tends to compress debris at the bottom of the blind hole, preventing it from being effectively rinsed out. Ultrasonic cleaning utilizes the cavitation effect of ultrasound to generate high-pressure micro-jet streams that impact residue within the blind hole. However, the formation of standing waves at the bottom of the blind hole due to sound wave reflection causes the cleaning energy to attenuate, preventing a thorough cleaning of the blind hole.

[0025] Therefore, there is an urgent need for a thread blind hole cleaning method that has both high cleaning efficiency and good cleaning effect.

[0026] This thread cleaning method is used to clean blind holes in the threads of a workpiece. In this embodiment, a blind hole with a diameter less than 12 mm and a depth greater than 8 mm is taken as an example. (Refer to...) Figure 1 The cleaning method includes the following steps: S1: Place the workpiece into the ultrasonic cleaning equipment for ultrasonic cleaning; Specifically, in this embodiment, the above steps involve placing the workpiece to be cleaned into an ultrasonic cleaning device containing a cleaning fluid. The ultrasonic cleaning device converts electrical signals into high-frequency vibrations of approximately 20kHz to 40kHz and transmits them to the cleaning fluid, causing a large number of tiny vacuum bubbles to be generated instantaneously within the cleaning fluid. These bubbles rapidly grow and then suddenly close and rupture, creating a cavitation effect. The cavitation effect is accompanied by localized high pressure and micro-jets, which powerfully impact the surface of the workpiece, peeling off and dispersing residual debris and dirt from the workpiece surface and threaded blind holes, thereby achieving efficient and thorough cleaning of the workpiece.

[0027] It is understandable that ultrasonic cleaning equipment is a mature existing device, and its specific structure and principle refer to existing technology, so they will not be elaborated here.

[0028] Optionally, the cleaning agent used in the ultrasonic cleaning equipment is MICRO-90. MICRO-90 is a readily available concentrated, weakly alkaline, multi-purpose cleaning agent with a pH of approximately 9.5. It is primarily composed of ionic and nonionic surfactants and chelating agents, and is free of harmful substances such as phosphates, borates, silicates, halides, phenols, and chlorofluorocarbons, meeting environmental and safety requirements. This cleaning agent effectively removes grease and has good compatibility with most metal materials. It is easy to rinse after use with virtually no residue, meeting the requirements for precision cleaning.

[0029] Furthermore, the ratio of cleaning agent to water is 1:200. That is, MICRO-90 cleaning agent is diluted with water at a volume ratio of 1:200. This significantly reduces the amount of cleaning agent consumed per cleaning operation while ensuring cleaning effectiveness, thereby reducing cleaning costs. In addition, the diluted cleaning solution has a milder pH, better compatibility with metal workpieces, further preventing corrosion or erosion of the workpiece by the cleaning solution. It also reduces the organic matter content in the wastewater, further improving the environmental friendliness of the cleaning solution.

[0030] Optionally, the ultrasonic cleaning temperature is 55±5℃. This temperature range effectively improves the activity and diffusion rate of MICRO-90 cleaning agent, enhances the wetting and penetration ability of the cleaning solution on the workpiece, and, combined with the cavitation effect of ultrasound, more efficiently peels off, emulsifies, and suspends oil, dirt, and other contaminants adhering to the workpiece surface and in the grooves of threaded blind holes, thus improving the cleaning effect and efficiency. This avoids the problem of low cleaning efficiency at room temperature and also avoids the problem of reduced cleaning effect due to the decomposition and volatilization of the effective components of the cleaning agent caused by excessively high temperatures.

[0031] Optionally, the ultrasonic cleaning time is 5 to 10 minutes. This ensures that contaminants such as debris are fully removed from the workpiece surface, effectively avoiding incomplete cleaning due to too short a cleaning time, and the risk of excessive cavitation erosion, coating damage, or material fatigue due to too long a cleaning time. This cleaning time range balances cleaning cleanliness and workpiece quality, while also reducing energy consumption and manpower requirements.

[0032] S2: Remove the workpiece and use the spray washing equipment 1 to rinse the threaded blind holes of the workpiece. The rinsing pressure of the spray washing equipment 1 is 0.35MPa~0.7MPa.

[0033] Specifically, in this embodiment, the above steps involve removing the workpiece from the ultrasonic cleaning equipment and then using a spray cleaning device 1 to rinse the threaded blind holes of the workpiece. The rinsing pressure of the spray cleaning device 1 is 0.35MPa~0.7MPa, which falls within the low-pressure range of the cleaning field. Within the aforementioned rinsing pressure range, the rinsing water flow can thoroughly rinse the threaded blind holes, removing contaminants from the thread grooves, and also allow the rinsed contaminants to flow out of the threaded blind holes with the water flow, effectively preventing the cleaned contaminants from being squeezed and accumulated at the bottom of the threaded blind holes. This method is convenient, quick, and saves time and effort.

[0034] like Figure 2 and Figure 3As shown, the spray washing device 1 includes a water supply pipe 11 and a nozzle 12. The nozzle 12 is detachably mounted on one end of the water supply pipe 11 and connected to it. The water supply pipe 11 connects to an external water supply device and the nozzle 12, and is used to continuously and stably supply water to the nozzle 12. The water flow is then sprayed through the nozzle 12 into the threaded blind hole, acting on the bottom of the threaded blind hole and the grooves within the threaded blind hole.

[0035] Specifically, a connector (not shown in the figure) is provided between the water supply pipe 11 and the nozzle 12, which enables the water supply pipe 11 and the nozzle 12 to be detachably connected, facilitating assembly and subsequent inspection and maintenance. At the same time, it can ensure the coaxial alignment of the water supply pipe 11 and the nozzle 12, improve the sealing and stability of the connection between the two, and prevent water leakage.

[0036] For example, the connector can be a commonly used threaded connector, quick connector, flange connector, or snap-fit ​​connector. All of the above types of connectors are existing structures, and their specific structures and principles are based on existing technologies. Those skilled in the art can flexibly select the appropriate type of connector according to actual needs, and will not be elaborated on further here.

[0037] The nozzle 12 has a length of 35mm to 50mm and includes an outlet 121 and an inlet 122. The diameter of the outlet 121 is less than 1.2mm. This smaller outlet diameter significantly increases the jet velocity at a given flow rate. According to Bernoulli's principle, higher velocity results in greater dynamic pressure, allowing the nozzle 12 to generate a concentrated, high-impact jet, thus improving the cleaning effect. Furthermore, the small-diameter outlet 121 limits the water flow, meeting rinsing needs while significantly reducing water consumption, achieving water conservation.

[0038] For example, in this embodiment, the diameter of the outlet 121 is 1 mm.

[0039] Furthermore, along the direction from the inlet 122 to the outlet 121, the inner diameter of the nozzle 12 gradually decreases. That is, along the direction of water flow, the inner diameter of the nozzle 12 gradually decreases, forcing the water flow velocity to be faster and the jet to be more concentrated, increasing the impact force and range of the water flow, thereby improving the cleaning effect on threaded blind holes.

[0040] Optionally, the nozzle 12 is equipped with a regulating valve, which can regulate the water flow rate in the nozzle 12. The operator can flexibly adjust the water flow rate in the nozzle 12 according to the usage requirements, making it more flexible to use. At the same time, the regulating valve can realize the smooth start and stop of the nozzle 12, reducing the probability of impact damage and extending the service life of the nozzle 12.

[0041] Specifically, the regulating valve can be a needle valve, ball valve, or solenoid valve, or other commonly used valves. Their specific structure and principle are based on existing technologies. Those skilled in the art can flexibly select the appropriate type of valve according to actual needs, which will not be elaborated on here.

[0042] Furthermore, the regulating valve is equipped with an operating section, which provides the operator with a stable and reliable grip and force application point, facilitating the turning of the regulating valve and improving operational convenience and comfort. Specifically, the operating section can adopt an ergonomic structural design to increase the grip area and improve grip comfort, avoiding hand fatigue caused by prolonged operation and enhancing operational comfort.

[0043] Specifically, the outer peripheral wall of the operating part is provided with an anti-slip structure. The anti-slip structure can be an anti-slip pad, such as a rubber pad, covering the outer peripheral wall of the operating part; or, the anti-slip structure can be anti-slip protrusions on the outer peripheral wall of the operating part. These protrusions can be dot-shaped protrusions or textured protrusions of any shape. Their function is to increase the contact friction between the operator's hand and the operating part, improving the reliability of the turning action. The specific form is similar to existing technology, and this embodiment does not impose specific limitations, as long as it can increase friction.

[0044] S3: Use drying equipment to dry the workpiece.

[0045] In this specific embodiment, the above steps involve using a drying device to dry the workpiece surface and the inside of the threaded blind hole. This removes residual moisture from the workpiece surface and the inner wall of the threaded blind hole, preventing oxidation and corrosion caused by moisture adhesion and ensuring workpiece quality. Simultaneously, eliminating water stains and watermarks also removes residual soluble impurities, improving the cleanliness of the workpiece and meeting the high cleanliness requirements of precision parts, electronic components, and other workpieces.

[0046] Specifically, the drying equipment can be commonly used in this field, such as air guns, ovens, vacuum drying ovens, and dryers. Their specific structures and principles are based on existing technologies and will not be elaborated here.

[0047] For example, in this embodiment, the drying equipment is an air gun. The air gun dries quickly and does not require long-term heating, which can save energy significantly and avoid heat damage to the workpiece such as deformation and discoloration caused by high temperature. In addition, the air gun adopts non-contact drying, which will not scratch the workpiece, and can effectively remove moisture in the threaded blind hole, reduce water spots and water stains, and ensure a clean and uniform drying effect. At the same time, the equipment has a simple structure and is flexible to use, and can be handheld for fixed-point blowing.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for cleaning blind holes in threads, used for cleaning blind holes in threads drilled in a workpiece, characterized in that, The steps include the following: S1: Place the workpiece into an ultrasonic cleaning device for ultrasonic cleaning; S2: Take out the workpiece and use a spray cleaning device (1) to rinse the threaded blind hole of the workpiece. The rinsing pressure of the spray cleaning device (1) is 0.35MPa~0.7MPa. S3: Dry the workpiece using a drying device.

2. The thread blind hole cleaning method according to claim 1, characterized in that, The cleaning agent used in the ultrasonic cleaning equipment is MICRO-90.

3. The thread blind hole cleaning method according to claim 2, characterized in that, The ratio of the cleaning agent to water is 1:

200.

4. The thread blind hole cleaning method according to claim 1, characterized in that, The temperature for ultrasonic cleaning is 55±5℃.

5. The method for cleaning blind holes in threads according to claim 1, characterized in that, The ultrasonic cleaning time is 5 to 10 minutes.

6. The method for cleaning threaded blind holes according to claim 1, characterized in that, The spray washing device (1) includes a water supply pipe (11) and a nozzle (12). The nozzle (12) is detachably disposed at one end of the water supply pipe (11) and connected to the water supply pipe (11). The length of the nozzle (12) is 35mm~50mm. The nozzle (12) has an outlet (121) and an inlet (122). The diameter of the outlet (121) is less than 1.2mm.

7. The method for cleaning threaded blind holes according to claim 6, characterized in that, Along the direction from the inlet (122) to the outlet (121), the inner diameter of the nozzle (12) gradually decreases.

8. The method for cleaning threaded blind holes according to claim 6, characterized in that, The nozzle (12) is provided with a regulating valve, which can regulate the water flow rate in the nozzle (12).

9. The method for cleaning threaded blind holes according to claim 8, characterized in that, The regulating valve is equipped with an operating section.

10. The thread blind hole cleaning method according to claim 6, characterized in that, A connector is provided between the water supply pipe (11) and the nozzle (12).

Images