Sand blowing shielding jig, manufacturing method thereof and sand blowing method

Abstract

The invention provides a sand blasting shielding clamp, a manufacturing method thereof and a sand blasting method. The manufacturing method of the sand blasting shielding clamp comprises the following steps that S1, molten shielding resin is provided; s2, a non-coating area (A) of the workpiece is subjected to blocking treatment; s3, the resin forming covering area (C) of the workpiece is immersed in shielding resin, then the shielding resin attached to the resin forming covering area (C) is cooled, and therefore a flexible sleeve-shaped shielding resin covering part (30) is formed on the resin forming covering area (C), and the resin forming covering area (C) at least comprises the non-coating area (A); and S4, the shielding resin covering part (30) is taken down from the workpiece, the sand blasting shielding clamp is obtained on the basis of the shielding resin covering part (30), the sand blasting shielding clamp is provided with a flexible sleeve-shaped clamp body, and an inner cavity of the clamp body is suitable for containing the non-coating area (A) of the workpiece. The invention can reduce the cost and improve the shielding effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of sand blasting shielding fixture and sand blasting treatment, and particularly relates to a sand blasting shielding fixture and a manufacturing method thereof, and a sand blasting method. Background Art

[0002] In modern industrial production, it is often necessary to coat some surfaces of workpieces according to technical requirements. Before coating the workpiece, the coating area (the surface of the workpiece to be coated) is usually sandblasted. The main purpose of sandblasting is to remove impurities such as oxides, rust, oil stains, old paint layers, etc. on the surface of the material, increase the surface roughness, and thus enhance the adhesion of the paint or coating.

[0003] Taking gas turbine as an example, turbine blades are the key working parts of gas turbine. Turbine blades include blade roots and blade bodies. The blade body is the main working part, which is subjected to the impact of high temperature and high pressure airflow. It is necessary to apply a special coating on its surface, which is the coating area. The blade root is the connecting part used to connect with the turbine wheel, which includes the mounting and matching structure and the cooling structure, and is a non-coated area. Before coating the blade body, the blade body needs to be sandblasted. Through sandblasting, a clean and rough substrate surface can be obtained to obtain better coating adhesion and a clean interface structure. However, the mounting structure and cooling structure in the blade root need to avoid sandblasting contact to prevent damage. Therefore, non-coated areas such as the blade root need to be shielded before sandblasting. Other parts of the gas turbine that require sandblasting usually include combustion chambers, heat exchangers, etc.

[0004] At present, the design and manufacture of common sandblasting masking fixtures are obtained through the design and processing of metal materials. Due to the high strength of metal materials and other factors, the processing cycle is generally long, the assembly accuracy requirements are high, and the working hours in the production process are relatively long. At the same time, a large number of machining equipment and process control are required, such as milling, electrical machining, welding, grinding, etc. At the same time, the metal masking fixture is prone to scratches and bumps at the joints with the product during use, thereby causing dimensional accuracy problems. Metal masking fixtures also cannot be reused or need to be continuously repaired due to deformation and corrosion problems during use, and the repair cycle and difficulty are relatively large.

[0005] Another method of manufacturing masking fixtures is to use 3D printing technology to manufacture fixtures, which requires expensive equipment investment. At the same time, the printed fixtures have rough surfaces and need to be smoothed before use. There are also complex post-processing procedures. Summary of the invention

[0006] The technical problem to be solved by the present disclosure is to provide a sand blasting shielding fixture and a manufacturing method thereof and a sand blasting method, so as to reduce the cost and improve the shielding effect.

[0007] To solve the above technical problems, according to one aspect of the present disclosure, a method for manufacturing a sand blasting shielding fixture is provided, wherein the sand blasting shielding fixture is used to shield a non-coated area of ​​a workpiece from being affected by the sand blasting operation during a sand blasting operation before the workpiece is coated with a coating, and wherein the method comprises the following steps: S1: providing a molten shielding resin; S2: performing a sealing treatment on the non-coated area of ​​the workpiece to seal at least part of a concave structure located in the non-coated area; S3: immersing a resin-formed covering area of ​​the workpiece into a shielding resin, and then cooling the shielding resin attached to the resin-formed covering area, thereby forming a flexible sleeve-shaped shielding resin covering on the resin-formed covering area, wherein the resin-formed covering area at least includes the non-coated area; and S4: removing the shielding resin covering from the workpiece, and obtaining the sand blasting shielding fixture based on the shielding resin covering, wherein the sand blasting shielding fixture has a flexible sleeve-shaped fixture body, and an inner cavity of the fixture body is suitable for accommodating the non-coated area of ​​the workpiece.

[0008] In the scheme disclosed in the present invention, the workpiece itself is used as a mold, and a solidified resin is used to form a sand blasting shielding fixture that fits the workpiece through a melt coating process. The process is simple, the production cost of the fixture is low, and the fixture has good adaptability and shielding effects. Moreover, since at least part of the concave structure in the resin forming covering area is blocked, the shielding resin cover / sand blasting shielding fixture is easy to remove from the workpiece, and the sand blasting shielding fixture is also easy to coat on the workpiece to shield the workpiece, which is convenient for both the production operation when the sand blasting shielding fixture is manufactured and the shielding operation when the sand blasting shielding fixture is used.

[0009] Further, in the step S1: the masking resin is provided by a heatable container, and / or the inner size of the container is larger than the size of the resin forming covering area (C) of the workpiece.

[0010] In this embodiment, the use of a heatable container can conveniently keep the masking resin in a suitable molten state, and the larger internal size of the container can ensure that the masking resin can cover the entire resin forming covering area B1 in one immersion, thereby improving production efficiency.

[0011] Furthermore, the masking resin meets the following requirements: a melting point of 150-200° C., and a strength at room temperature suitable for withstanding the impact of 45-90 mesh sand at a sand blowing pressure of 3-4 bar.

[0012] In this embodiment, the masking resin in this melting point range is easy to form and maintain in a suitable molten state, and the room temperature strength can ensure the reliability of the sand blasting masking fixture.

[0013] Furthermore, in the step S2, the concave structure is sealed with an adhesive tape.

[0014] In this embodiment, the adhesive tape is used as the blocking material to block the concave structure, which is easy to operate, low in cost, and convenient to remove the blocking material.

[0015] Further, the concave structure sealed with tape includes: a first type of recess, which is a hole or a sealing groove formed by recessing downward from a predetermined surface of the workpiece; or a second type of recess, which is a relatively recessed area formed between at least a first convex wall and a first convex wall protruding and extending from the surface of the workpiece.

[0016] In this embodiment, the first type of recess is a local recess on the local surface of the workpiece, and the second type of recess is a larger recess on the contour of the workpiece. By blocking the first type of recess, the sand blasting shielding fixture obtained can have a larger fitting area with the surface of the entire workpiece during use, better bonding, and more stable and reliable use. By blocking the second type of recess, the sand blasting shielding fixture obtained can be easier to cover and remove during use, and the amount of shielding resin used can be saved, the fixture is lighter, and the operation is easier.

[0017] Further, the step S3 includes the following steps: S31: immersing the workpiece for a first predetermined time; S32: taking out the workpiece to cool for a second predetermined time; and S33: repeating the steps S31 and S32 in sequence to make the shielding resin cover reach a predetermined thickness.

[0018] In this embodiment, by repeating the immersion and cooling operations, the thickness of the masking resin cover is made to better meet the use requirements.

[0019] Furthermore, the first predetermined time for first immersing the workpiece in step S31 and the second predetermined time for first taking out the workpiece in step S32 are greater than the first predetermined time and the second predetermined time for each repeated operation in step S33.

[0020] In this embodiment, the entire manufacturing process of the masking jig can be made shorter in time, and the masking jig has better strength and durability due to the thicker base resin layer.

[0021] Further, in the step S3, the masking resin immerses the non-coated area of ​​the workpiece, and also immerses the extended covering area adjacent to the non-coated area in the coated area of ​​the workpiece, so that the resin-formed covering area includes the non-coated area and the extended covering area; accordingly, in the step S4, the masking resin covering includes a basic covering part corresponding to the non-coated area and an extended covering part corresponding to the extended covering area, wherein, in the step S4, obtaining the sand blasting shielding fixture based on the masking resin covering includes: removing the extended covering part from the masking resin covering, thereby obtaining the sand blasting shielding fixture from the basic covering part, wherein the basic covering part has an open end corresponding to the removed extended covering part and a closed end opposite to the open end.

[0022] In this embodiment, by allowing the masking resin to further immerse the extended covering area, the integrity of the obtained sand blasting masking fixture can be better ensured. At the same time, removing the extended covering component also ensures that the sand blasting masking fixture will not mask the coating area of ​​the workpiece in subsequent sand blasting operations, thereby ensuring that the sand blasting masking fixture can achieve the accuracy of the masking area.

[0023] Further, in the step S4, obtaining the sand blasting shielding fixture from the basic cover part includes: cutting along the longitudinal corner line on the shielding resin cover from the open end to the closed end to form a corner line cut of a predetermined length.

[0024] In this embodiment, since a corner line cut extending from the open end to the closed end is formed on the basic covering part, it is easy to remove the basic covering part from the workpiece to obtain the sand blasting shielding fixture. At the same time, when the sand blasting shielding fixture is used to shield the workpiece in the subsequent sand blasting shielding operation, the sand blasting shielding fixture with the corner line cut is also easier to wrap around the tool, making the operation more convenient.

[0025] According to another aspect of the present disclosure, a sand blasting shielding fixture is provided, which is obtained by any one of the aforementioned methods for manufacturing the sand shielding fixture.

[0026] According to another aspect of the present disclosure, a sand blasting shielding fixture is provided, characterized in that it comprises: a flexible sleeve-shaped fixture body, the fixture body being formed by one or more layers of shielding resin, comprising an open end and a closed end, the inner cavity of the fixture body being suitable for accommodating the non-coated area of ​​the workpiece.

[0027] In the scheme disclosed herein, since the fixture body is in a flexible sleeve shape and is formed of a masking resin, and the inner cavity is adapted to the non-coated area of ​​the workpiece, the production cost of the fixture is low, and the adaptability and masking effect of the fixture are good. Moreover, the sand blasting masking fixture is also convenient to be coated on the workpiece to mask the workpiece, thereby facilitating the masking operation of the sand blasting masking fixture. By repeating the immersion and cooling operations, the fixture body can be formed of multiple layers of masking resin. Compared with a single layer of masking resin, the multiple layers of masking resin can make the thickness of the masking resin cover better meet the use requirements.

[0028] Furthermore, the clamp body has a longitudinal corner line and a corner line cut of a predetermined length formed by shearing from the open end to the closed end along the longitudinal corner line.

[0029] In this embodiment, since a corner line cut extending from the open end to the closed end is formed on the fixture body, when the sand blasting shielding fixture is used to shield the workpiece during the sand blasting shielding operation, the sand blasting shielding fixture with the corner line cut can be easily wrapped around the workpiece, making the operation more convenient.

[0030] Furthermore, the sand blasting and shielding fixture further comprises a cutout closing piece for closing the corner line cutout.

[0031] In this embodiment, the corner line cutout on the jig body is closed by using the cutout closing piece, so that the sand blasting shielding jig with the corner line cutout is completely and firmly wrapped around the workpiece, thereby ensuring reliable shielding during the sand blasting operation.

[0032] Furthermore, the incision sealing member is an adhesive tape, and the adhesive tape is wound around the clamp body in one or more turns along the circumferential direction.

[0033] In this embodiment, the adhesive tape is used to wrap around the fixture body, so that the corner cut is ensured to be closed. At the same time, the wrapping of the adhesive tape around the fixture body also enables the sand blasting shielding fixture to be more firmly wrapped around the workpiece, thereby further ensuring reliable shielding during the sand blasting operation.

[0034] According to another aspect of the present disclosure, a sand blasting method is provided, comprising using any one of the aforementioned sand blasting shielding fixtures to shield a non-coating area of ​​a workpiece from being affected by the sand blasting operation during a sand blasting operation before coating the workpiece with a coating.

[0035] According to another aspect of the present disclosure, a sand blasting method is provided, which uses a sand blasting shielding fixture to shield a non-coated area of ​​a workpiece from being affected by the sand blasting operation during the sand blasting operation before the workpiece is coated with a coating, and is characterized in that the method comprises the following steps: S5: providing a sand blasting shielding fixture, the sand blasting shielding fixture having a flexible sleeve-shaped fixture body, the fixture body being formed of a shielding resin and comprising an open end and a closed end, the inner cavity of the fixture body being suitable for accommodating the non-coated area of ​​the workpiece; S6: using the sand blasting shielding fixture to cover the workpiece to shield the non-coated area of ​​the workpiece; S7: sand blasting the coated area B of the workpiece; and S8: removing the sand blasting shielding fixture.

[0036] In the solution of the present disclosure, since the fixture body is in a flexible sleeve shape and is formed of a masking resin, and the inner cavity is adapted to the non-coating area of ​​the workpiece, the masking operation when the sandblasting masking fixture is used is facilitated.

[0037] Furthermore, the clamp body has a longitudinal corner line and a corner line cut of a predetermined length formed by shearing from the open end to the closed end along the longitudinal corner line; the step S6 comprises: S61: at least partially unfolding the clamp body from the corner line cut; S62: wrapping the clamp body onto the workpiece; and S63: closing the corner line cut with a cut closure, the cut closure being a tape, and the tape is wrapped around the clamp body in a circumferential direction for one or more turns.

[0038] In this embodiment, during the sand blasting and shielding operation, the sand blasting and shielding fixture with the corner line cutout is convenient to be wrapped onto the tool, and the integrity of the sand blasting and shielding fixture can be maintained by wrapping with tape, thus making the shielding operation more convenient and reliable.

[0039] Furthermore, the step S8 includes: cutting the tape and removing the fixture body from the workpiece.

[0040] In this embodiment, the clamp body can be removed by cutting the tape, which is simple, convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0042] Figure 1 is a schematic diagram of a three-dimensional structure of a workpiece under an observation angle, the workpiece being a blade of a gas turbine, wherein it is shown that the concave structure of a non-coating area of ​​the workpiece includes a first type of concave portion and a second type of concave portion;

[0043] Figure 2 According to an embodiment of the present disclosure Figure 1 A schematic diagram of the three-dimensional structure of the workpiece after a portion of the concave structure in the non-coated area of ​​the workpiece is blocked;

[0044] Figure 3 yes Figure 1 The three-dimensional structure schematic diagram of the workpiece at another viewing angle is shown, showing the non-coating area, coating area, and resin-formed covering area of ​​the workpiece;

[0045] Figure 4 is Figure 1 A photograph of a sandblasting masking fixture fabricated using a masking resin on a workpiece shown, wherein a masking resin cover is formed on the workpiece having a base cover portion located in a non-coated area of ​​the workpiece and an extended cover portion located in a coated area of ​​the workpiece;

[0046] Figure 5 is a schematic flow chart of a method for manufacturing a sand blasting shielding fixture according to an embodiment of the present disclosure;

[0047] Figure 6 It is a schematic flow chart of a sand blasting method according to an embodiment of the present disclosure.

[0048] Description of Figure Numbers:

[0049] 10. Leaf blade; 11. Leaf root; 12. Leaf body;

[0050] 20. Adhesive tape;

[0051] 30. Shielding resin cover; 31. Basic cover portion; 31a. Longitudinal corner line;

[0052] 32. Extended cover part; 33. Sand blasting shielding dividing line;

[0053] A. Non-coated area;

[0054] B. Coating area; B1. Extended coverage area;

[0055] C. Resin forming coverage area;

[0056] PW1, first convex wall; PW2, second convex wall;

[0057] R1, first type of concave portion; R2, second type of concave portion. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well.

[0060] Figure 1 is a schematic diagram of a three-dimensional structure of a workpiece under an observation angle, the workpiece being a blade of a gas turbine, wherein it is shown that the concave structure of a non-coating area of ​​the workpiece includes a first type of concave portion and a second type of concave portion; Figure 2 According to an embodiment of the present disclosure Figure 1 A schematic diagram of the three-dimensional structure of the workpiece after a portion of the concave structure in the non-coated area of ​​the workpiece is blocked; Figure 3 yes Figure 1 The three-dimensional structure schematic diagram of the workpiece at another viewing angle is shown, showing the non-coating area, coating area, and resin-formed covering area of ​​the workpiece; Figure 4 is Figure 1 A photograph of a sandblasting masking fixture fabricated using a masking resin on a workpiece shown, wherein a masking resin cover is formed on the workpiece having a base cover portion located in a non-coated area of ​​the workpiece and an extended cover portion located in a coated area of ​​the workpiece; Figure 5 It is a schematic flow chart of a method for manufacturing a sand blasting shielding fixture according to an embodiment of the present disclosure.

[0061] See also Figure 3 It can be seen that in this embodiment of the present disclosure, the workpiece is a blade 10 of a gas turbine. The blade 10 includes a blade root 11 and a blade body 12, wherein the blade root 11 cannot be coated with a coating, and the area where the blade root 11 is located is a non-coating area A. The blade body 12 needs to be coated with a coating, and the area where the blade body 12 is located is a coating area B.

[0062] See also Figure 1 It can be seen that there are multiple concave structures on the blade root 11. The concave structures include a first type of concave portion R1 and a second type of concave portion R2. The first type of concave portion R1 is a hole or sealing groove formed by being recessed downward from certain surfaces of the blade root. For example, Figure 1It is shown in the figure that there are sealing grooves recessed into the two opposite sides of the blade root 11, and there are holes on the bottom surface of the blade root 11 away from the blade body 12. These sealing grooves and holes are relatively small local concave structures, that is, the first type of concave portion R1. The second type of concave portion R1 is a relatively concave area formed between at least two convex walls extending protruding from the surface of the workpiece. For example, Figure 1 As shown in FIG. 1 , a first convex wall PW1 and a first convex wall PW2 are extended from the other two opposite sides of the blade root 11 , and a larger concave structure is formed between the two convex walls, namely, the second type of concave portion R2 .

[0063] See also Figure 5 According to an embodiment of the present disclosure, a method for manufacturing a sand blasting shielding fixture comprises the following steps:

[0064] Step S1: providing molten masking resin.

[0065] According to the embodiments of the present disclosure, preferably, the masking resin preferably meets the following requirements: a melting point of 150-200°C, high strength and toughness at room temperature, specifically, being able to withstand sand blasting of 45-90 mesh sand material at a sand blasting pressure of 3-4 bar, and being able to meet a predetermined number of uses (for example, making the obtained masking fixture have a service life of at least 50 times under such sand blasting conditions) without being damaged. In this embodiment, the masking resin in this melting point range is easy to form and maintain in a suitable molten state, and the room temperature strength can ensure the reliability of the sand blasting masking fixture.

[0066] Preferably, in one embodiment, the masking resin can be placed in a heatable container, the size of which is larger than the blade root 11 of the blade 10, that is, larger than the size of the non-coating area A to be masked of the workpiece. In this embodiment, due to the use of a heatable container, the masking resin can be conveniently kept in a suitable molten state. In addition, the larger internal size of the container can ensure that the masking resin can cover the entire resin forming covering area C (shown in FIG. 1 ) of the blade 10 after one immersion. Figure 3 ), improve production efficiency.

[0067] Step S2: performing a blocking treatment on the non-coating area A to block at least part of the concave structure in the non-coating area C. Figure 2 In one embodiment, during implementation, the adhesive tape 20 may be used to seal only the first type of recess R1 on the blade root 11 .

[0068] Using the adhesive tape 20 as a plugging material to plug the concave structure is simple to operate, low in cost, and easy to remove the plugging material. Of course, other types of strip-shaped plugging materials other than the adhesive tape, or other types of plugging materials other than the strip-shaped plugging material, such as embedded plugging materials, are also feasible.

[0069] In another embodiment not shown, the first type of recess R1 may not be blocked, but only the second type of recess R2 may be blocked.

[0070] Since the first type of recess R1 is a local recess on the local surface of the blade, and the second type of recess R2 is a larger recess on the blade contour, the method of blocking the first type of recess R1 can make the resulting sand blasting shielding fixture have a larger fitting area with the surface of the entire blade during use, and the combination is better, and the use is more stable and reliable. In comparison, the method of blocking the second type of recess R2 can make the covering and removal operations of the resulting sand blasting shielding fixture easier during use, and can save the use of masking resin, the fixture is lighter, and the operation is easier.

[0071] Step S3: Combine with reference Figure 3 and Figure 4 The resin-molded covering area C of the blade 10 can be completely inserted into a container (e.g., a heatable container) by hand, for example, to immerse the blade 10 in the molten masking resin, wait for a period of time, and then take the blade 10 out of the container to cool the masking resin attached to the resin-molded covering area C, thereby forming a flexible sleeve-shaped masking resin cover 30 (shown in FIG. 1 ) on the resin-molded covering area C. Figure 4 ), the resin-molded covering area C includes at least the non-coating area A.

[0072] As an embodiment, step S3 further includes the following steps: S31, immersing the blade for a first predetermined time; S32, taking out the blade to cool for a second predetermined time. In this way, the shielding resin cover 30 can be cured and formed to form the fixture body. In one embodiment,

[0073] As another embodiment, step S3 may further include step S33, which is to repeat steps S31 and S32 in sequence to make the shielding resin cover 30 reach a predetermined thickness.

[0074] In a specific implementation, the waiting time (immersion duration) after the first insertion of the blade 10 in steps S31 and S32 and the cooling time after the blade 10 is taken out are relatively long. For example, the waiting time may be 1 to 2 minutes, and the cooling time may be 1 to 2 minutes, until the masking resin attached to the surface of the blade 10 is cooled to 30° C. to 50° C. The waiting time (immersion duration) and the cooling time in the repeated process (which may be one or more continuous cycle processes) in step S33 are relatively short. For example, the waiting time after the blade is inserted may be 40-60 seconds, and the cooling time after the blade is taken out may be 10-20 seconds, until the masking resin cover 30 (shown in FIG. 1 ) is cooled to 30° C. to 50° C. Figure 4 The thickness of the blades is 4-10 mm and the blades are cooled to room temperature.

[0075] In this embodiment, by repeating the immersion and cooling operations, the thickness of the shielding resin cover 30 better meets the use requirements. By repeating the immersion and cooling operations, the shielding resin cover 30 formed in this way and the final clamp body formed are a multi-layer resin structure in physical structure.

[0076] The waiting time (immersion duration) after the first insertion of the blade 10 and the cooling time after the blade 10 is removed are relatively long, and the waiting time (immersion duration) and the cooling time in the repeated process (which can be one or more continuous cycle processes) in step S33 are relatively short. In this way, the entire manufacturing process of the shielding jig can be made shorter, and the shielding jig has better strength and durability due to the thicker base resin layer.

[0077] Step S4: removing the masking resin cover 30 from the blade 10, and obtaining a sand blasting masking fixture based on the masking resin cover 30, wherein the sand blasting masking fixture has a flexible sleeve-shaped fixture body, and the inner cavity of the fixture body is suitable for accommodating the non-coating area A of the workpiece.

[0078] In the solution disclosed in the present invention, the blade 10 itself is used as a mold, and a solidified resin is used to form a sand blasting shielding fixture that is adapted to the blade 10 through a melt coating process. The process is simple, the production cost of the fixture is low, and the adaptability and shielding effect of the fixture are good. Moreover, since at least part of the concave structure in the resin forming covering area C is blocked, the shielding resin cover 30 / sand blasting shielding fixture is easy to remove from the workpiece, and the sand blasting shielding fixture is also easy to cover the blade 10 to shield the blade 10. In this way, it is convenient for both the production operation when the sand blasting shielding fixture is manufactured and the shielding operation when the sand blasting shielding fixture is used.

[0079] In a preferred embodiment, still in combination with Figure 3 and Figure 4 In step S3, the masking resin not only immerses the non-coating area A of the blade 10, but also immerses the extended covering area B1 adjacent to the non-coating area A in the coating area B of the blade 10, so that the resin-formed covering area C includes the non-coating area A and the extended covering area B1. Figure 4 As can be seen in FIG, the two regions are separated by the sandblasting shielding boundary line 33, and the width of the extended covering region B1 is preferably 10-20 mm. Accordingly, in step S4, the shielding resin cover 30 includes a basic cover portion 31 corresponding to the non-coating region A and an extended cover portion 32 corresponding to the extended covering region B1.

[0080] In step S4, the extended cover part 32 is removed from the masking resin cover 30 by cutting or the like, and the basic cover part 31 is retained, so that the sand blasting masking jig is obtained from the basic cover part 31. The basic cover part 31 has an open end corresponding to the removed extended cover part 32 and a closed end opposite to the open end.

[0081] In this embodiment, by allowing the masking resin to further immerse the extended covering area B1, the integrity of the obtained sand blasting masking fixture can be better ensured. At the same time, removing the extended covering part 32 also ensures that the sand blasting masking fixture will not mask the coating area B of the workpiece in the subsequent sand blasting operation, thereby ensuring that the sand blasting masking fixture can achieve the accuracy of the masking area.

[0082] In a preferred embodiment, in conjunction with Figure 4 In step S4, obtaining the sand blasting shielding fixture from the basic cover part 31 further includes: cutting along the longitudinal corner line 31a on the shielding resin cover 30 from the open end to the closed end to form a corner line cut of a predetermined length.

[0083] In this embodiment, since a corner line cut extending from the open end to the closed end is formed on the basic covering part 31, it is convenient to remove the basic covering part 31 from the workpiece to obtain a sand blasting shielding fixture. At the same time, when the sand blasting shielding fixture is used to shield the workpiece in the subsequent sand blasting shielding operation, the sand blasting shielding fixture with the corner line cut is also easier to wrap around the tool, making the operation more convenient.

[0084] Preferably, the corner line cut should be as short as possible to facilitate the removal of the basic cover part 31 from the blade 10 as a simulated part. In this way, the shielding fixture can have better integrity, thereby obtaining a better shielding effect in the subsequent sandblasting operation.

[0085] The sand blasting masking fixture disclosed in the present invention comprises a flexible sleeve-shaped fixture body, which is formed of a masking resin and comprises an open end and a closed end. The inner cavity of the fixture body is suitable for accommodating a non-coating area A of a workpiece.

[0086] In the solution disclosed in the present invention, since the fixture body is in a flexible sleeve shape and is formed of a masking resin, and the inner cavity is adapted to the non-coated area of ​​the workpiece, the production cost of the fixture is low, and the adaptability and masking effect of the fixture are good. Moreover, the sand blasting masking fixture is also easy to cover the workpiece to mask the workpiece, thereby facilitating the masking operation of the sand blasting masking fixture.

[0087] In a preferred embodiment, the fixture body has a longitudinal corner line 31a and a corner line cut of a predetermined length formed by shearing from the open end to the closed end along the longitudinal corner line 31a. In this embodiment, since the corner line cut extending from the open end to the closed end is formed on the fixture body, when the sand blasting shielding fixture is used to shield the workpiece during the sand blasting shielding operation, the sand blasting shielding fixture with the corner line cut is easy to cover the workpiece, making the operation more convenient.

[0088] In another preferred embodiment, the sand blasting shielding fixture further comprises a cutout sealing member for sealing the corner cutout. In this embodiment, the corner cutout on the fixture body is sealed by using the cutout sealing member, so that the sand blasting shielding fixture with the corner cutout is completely and firmly wrapped around the workpiece, thereby ensuring reliable shielding during the sand blasting operation.

[0089] In another preferred embodiment, the cut-off sealing member is an adhesive tape, which is wound around the fixture body in one or more turns along the circumferential direction. In this embodiment, by using the adhesive tape to wrap around the fixture body, the corner cut is ensured to be closed, and the wrapping of the adhesive tape around the fixture body also enables the sand blasting shielding fixture to be more firmly wrapped around the workpiece, thereby further ensuring reliable shielding during the sand blasting operation.

[0090] See below Figure 6 , and see Figure 3 and 4 The sand blasting method according to the present disclosure is described. The sand blasting method of the present disclosure includes using the aforementioned sand blasting shielding fixture to shield the non-coating area A of the workpiece from the influence of the sand blasting operation during the sand blasting operation before the workpiece is coated with a coating.

[0091] More specifically, according to one aspect of the present disclosure, the sand blasting method of the present disclosure comprises the following steps:

[0092] Step S5: providing a sand blasting shielding fixture, wherein the sand blasting shielding fixture has a flexible sleeve-shaped fixture body, the fixture body is formed of a shielding resin, comprises an open end and a closed end, and the inner cavity of the fixture body is suitable for accommodating the non-coating area A of the workpiece.

[0093] Step S6: Use a sandblasting masking fixture to cover the workpiece to mask the non-coating area A of the workpiece.

[0094] In one embodiment, the clamp body has a longitudinal corner line 31a and a corner line cut of a predetermined length formed by cutting along the longitudinal corner line 31a from the open end to the closed end. Accordingly, step S6 includes the following steps: S61: at least partially unfolding the clamp body from the corner line cut; S62: wrapping the clamp body onto the blade 10; and S63: closing the corner line cut with a cut closure. Preferably, the cut closure is an adhesive tape, which is wrapped around the clamp body one or more times in a circumferential direction. Of course, as a feasible embodiment, the cut closure can also be a suture.

[0095] Step S7: sandblasting the coated area B of the workpiece. In step S7, since the sandblasting shielding fixture is used to shield the non-coated area A of the blade 10, the influence of the sandblasting operation on this area is avoided.

[0096] Step S8: removing the sandblasting shielding fixture. The removed shielding fixture can be reused to shield and protect the non-coating area in the sandblasting operation of other blades.

[0097] In the solution of the present disclosure, in this embodiment, since the fixture body is in a flexible sleeve shape and is formed of a masking resin, and the inner cavity is adapted to the non-coated area of ​​the workpiece, the masking operation when the sand blasting masking fixture is used is facilitated. Moreover, in the sand blasting masking operation, the sand blasting masking fixture with the corner line cutout is convenient to be wrapped around the tool, and the integrity of the sand blasting masking fixture can be maintained by wrapping with tape, thereby making the masking operation more convenient and reliable.

[0098] In one embodiment, step S8 includes: cutting the adhesive tape to remove the fixture body from the workpiece. In this embodiment, the fixture body can be removed by cutting the adhesive tape, which is simple, convenient and efficient.

[0099] The present disclosure has the following advantages:

[0100] 1. The present invention provides a simple manufacturing process and use method of a masking fixture, which is particularly suitable for masking non-coating areas by manual sandblasting. The manufacturing method is simple, the cost is low, the use is convenient, and the device can be used repeatedly.

[0101] 2. The solution disclosed herein uses a specific resin with a low melting point, wear resistance, certain strength and toughness, and is convenient for manufacturing and cutting.

[0102] 3. The manufacturing process of the masking fixture can include a precise sandblasting masking demarcation line based on tool cutting. At the same time, the use of the masking fixture adopts a contour wrapping method, which can efficiently and conveniently mask the sandblasting area (non-coating area). After the sandblasting is completed, it only needs to cut the external sutures or wrapped tapes to remove them, and there is basically no damage to the protected blade surface.

[0103] 4. The masking fixture has low manufacturing cost, cheap materials and easy procurement, and can be used repeatedly, which greatly reduces costs, material consumption and working hours.

[0104] 5. This shielding fixture can be used for shielding and protecting all similar workpieces, such as before manual sand blasting.

[0105] The above are only preferred embodiments of the present disclosure. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications should also be regarded as the protection scope of the present disclosure.

Claims

1. A method for manufacturing a sand blasting shielding fixture, wherein the sand blasting shielding fixture is used to shield a non-coated area (A) of a workpiece from being affected by the sand blasting operation during a sand blasting operation before the workpiece is coated with a coating, wherein: The method comprises the following steps: S1: providing molten masking resin; S2: performing a blocking process on the non-coated area (A) of the workpiece to block at least a portion of the concave structure located in the non-coated area (A); S3: immersing the resin-molded covering area (C) of the workpiece into a masking resin, and then cooling the masking resin attached to the resin-molded covering area (C), thereby forming a flexible sleeve-shaped masking resin cover (30) on the resin-molded covering area (C), wherein the resin-molded covering area (C) includes at least the non-coating area (A); and S4: removing the shielding resin cover (30) from the workpiece, and obtaining the sand blasting shielding fixture based on the shielding resin cover (30), The sand blasting shielding fixture has a flexible sleeve-shaped fixture body, and the inner cavity of the fixture body is suitable for accommodating the non-coating area (A) of the workpiece.

2. The method for manufacturing a sand blasting shielding fixture according to claim 1, characterized in that: In step S1: providing the masking resin via a heatable vessel, and / or, The inner dimensions of the vessel are larger than the dimensions of the resin-molded covered area (C) of the workpiece.

3. The method for manufacturing the sand blasting shielding fixture according to claim 1, characterized in that: The masking resin meets the following requirements: a melting point of 150-200° C. and a strength at room temperature suitable for withstanding the impact of 45-90 mesh sand at a sand blowing pressure of 3-4 bar.

4. The method for manufacturing a sand blasting shielding fixture according to claim 1, characterized in that: In the step S2, the concave structure is sealed with an adhesive tape (20).

5. The method for manufacturing the sand blasting shielding fixture according to claim 4, characterized in that: The concave structure sealed with tape includes: A first type of recess (R1), wherein the first type of recess (R1) is a hole or a sealing groove formed by being recessed downward from a predetermined surface of the workpiece; or A second type recess (R2) is a relatively recessed area formed between at least a first convex wall (PW1) and a first convex wall (PW2) extending protruding from the surface of the workpiece.

6. The method for manufacturing the sand blasting shielding fixture according to claim 1, characterized in that: The step S3 comprises the following steps: S31: immersing the workpiece for a first predetermined time; S32: taking out the workpiece to cool for a second predetermined time; and S33: Repeat the steps S31 and S32 in sequence to make the shielding resin cover (30) reach a predetermined thickness.

7. The method for manufacturing the sand blasting shielding fixture according to claim 6, characterized in that: The first predetermined time for first immersion of the workpiece in step S31 and the second predetermined time for first removal of the workpiece in step S32 are greater than the first predetermined time and the second predetermined time for each repetition of the operation in step S33.

8. The method for manufacturing a sand blasting shielding fixture according to claim 1, characterized in that: In the step S3, the masking resin immerses the non-coating area (A) of the workpiece and also immerses the extended covering area (B1) adjacent to the non-coating area (A) in the coating area (B) of the workpiece, so that the resin-formed covering area C includes the non-coating area (A) and the extended covering area (B1); Accordingly, in the step S4, the shielding resin cover (30) includes a basic cover portion (31) corresponding to the non-coating area (A) and an extended cover portion (32) corresponding to the extended cover area (B1), Wherein, in the step S4, obtaining the sand blasting shielding fixture based on the shielding resin covering (30) comprises: removing the extended covering part (32) from the shielding resin covering (30), thereby obtaining the sand blasting shielding fixture from the basic covering part (31), wherein the basic covering part (31) has an open end corresponding to the removed extended covering part (32) and a closed end opposite to the open end.

9. The method for manufacturing the sand blasting shielding fixture according to claim 8, characterized in that: In the step S4, obtaining the sand blasting shielding fixture from the basic cover part (31) comprises: cutting along the longitudinal corner line (31a) on the shielding resin cover (30) from the open end to the closed end to form a corner line cut of a predetermined length.

10. A sand blasting and shielding jig obtained by the method for manufacturing a sand blasting and shielding jig according to any one of claims 1 to 9.

11. Sand blasting shielding fixture, characterized in that: include: A flexible sleeve-shaped fixture body is formed of one or more layers of masking resin, including an open end and a closed end, and the inner cavity of the fixture body is suitable for accommodating the non-coated area (A) of the workpiece.

12. The sand blasting shielding fixture according to claim 11, characterized in that: The clamp body has a longitudinal corner line (31a) and a corner line cut of a predetermined length formed by shearing from the open end to the closed end along the longitudinal corner line (31a).

13. The sand blasting shielding fixture according to claim 12, characterized in that: Also includes: A cutout closing piece is used to close the corner line cutout.

14. The sand blasting shielding fixture according to claim 13, characterized in that: The incision sealing member is an adhesive tape, and the adhesive tape is wound around the clamp body in one or more turns along the circumferential direction.

15. A sand blasting method, comprising using the sand blasting shielding jig according to any one of claims 10 to 14 to shield a non-coated area (A) of the workpiece from the influence of the sand blasting operation during the sand blasting operation before the workpiece is coated with a coating.

16. A sand blasting method, comprising: using a sand blasting shielding fixture to shield a non-coated area (A) of a workpiece from the influence of the sand blasting operation before the workpiece is coated with a coating, wherein: The method comprises the following steps: S5: providing a sand blasting shielding fixture, wherein the sand blasting shielding fixture has a flexible sleeve-shaped fixture body, the fixture body is formed of a shielding resin, includes an open end and a closed end, and the inner cavity of the fixture body is suitable for accommodating the non-coated area (A) of the workpiece; S6: using the sandblasting masking fixture to cover the workpiece to mask the non-coated area (A) of the workpiece; S7: sandblasting the coating area (B) of the workpiece; as well as S8: removing the sand blasting shielding fixture.

17. The sand blasting method according to claim 16, characterized in that: The clamp body has a longitudinal corner line (31a) and a corner line cut of a predetermined length formed by shearing from the open end to the closed end along the longitudinal corner line (31a); The step S6 comprises: S61: at least partially unfolding the clamp body from the corner line cutout; S62: Wrapping the fixture body onto the workpiece; and S63: closing the corner line cut with a cut closing piece, wherein the cut closing piece is an adhesive tape, and the adhesive tape is wound around the clamp body in a circumferential direction for one or more turns.

18. The sand blasting method according to claim 17, characterized in that: The step S8 includes: cutting the tape and removing the fixture body from the workpiece.

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