Mask frame, manufacturing method thereof and mask device

Abstract

The application provides a mask frame, a manufacturing method thereof and a mask device, and relates to the technical field of metal mask plates. The mask frame comprises a plurality of metal strips and a pin block, and the two ends of each metal strip are provided with grooves. The metal strips are sequentially abutted to form a rectangular frame, and the abutted ends of any two abutted metal strips are combined with the grooves to form pin grooves. The pin block has a shape and size matched with the pin grooves, and the pin block is installed in the pin grooves. The pin block, the metal strips and the metal strips at the abutted positions are welded with each other to obtain the mask frame. In the application, the metal strips constituting the mask frame are abutted with each other, and the metal strips are locked together by the pin block. In the subsequent welding process, the metal strips do not need to be additionally fixed, and the relative movement between the metal strips can be prevented, so that the welding seams are uniform and consistent, and the quality of the mask frame is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal mask, in particular to a mask frame, a manufacturing method thereof and a mask device. BACKGROUND

[0002] The mask frame is a main component of the metal mask, and is used as a carrier of the metal mask.

[0003] The mask frame is usually integrally processed from a whole plate. This production method produces a large amount of excess material, which cannot be reused and is recycled as metal waste, resulting in high production cost of the single mask frame. To solve the problem of high production cost, a new method of splicing the mask frame is adopted in the industry. In this method, the raw material plate is cut into metal strips, and the metal strips are connected end to end and welded together to form a rectangular mask frame. This method can greatly reduce the generation of waste.

[0004] However, when welding the mask frame, the metal strips that are not fixed to each other are prone to relative movement, which causes the metal strips to separate or deviate from each other, increases the joint or deviates from the proper position, affects the welding process, and reduces the quality of the product. Therefore, a new solution is needed. SUMMARY

[0005] To overcome the problem that the existing mask frame is prone to relative movement of the metal strips during welding, and to provide a high-quality mask frame, the present application provides a mask frame, a manufacturing method thereof and a mask device.

[0006] The mask frame of the present application comprises:

[0007] A plurality of metal strips are connected end to end to form a rectangular frame. Both ends of the metal strip have a groove. The grooves of the abutting ends of any two metal strips combine to form a pin slot.

[0008] The groove has a narrow part and a wide part. The wide part of any groove is farther away from the other groove with which it combines. The pin slot formed by the combination of the two grooves is narrow in the middle and wide at both ends.

[0009] And

[0010] A plurality of pin blocks are adapted to the shape and size of the pin slot and are accommodated in the pin slot.

[0011] The pin block and the metal strip, and the metal strip and the metal strip are welded to each other at the abutting end.

[0012] As a further solution, the pin slot is located on the upper side or the lower side of the rectangular frame, and the depth direction of the pin slot is consistent with the thickness direction of the metal strip;

[0013] The two faces of the two grooves combined as the pin slot face each other and are mutually penetrated.

[0014] As a further solution, the groove penetrates the metal strip in the thickness direction of the metal strip; or,

[0015] The depth of the groove in the thickness direction of the metal strip is a part of the thickness of the metal strip.

[0016] As a further solution, the depth of the groove in the thickness direction of the metal strip is half of the thickness of the metal strip.

[0017] As a further solution, the pin block has two outward protruding protrusions on each of the two opposite symmetrical sides, and the two protrusions have an inward recessed recess therebetween;

[0018] The two recesses of the pin block are adapted to the narrow part of the two grooves constituting the pin slot;

[0019] The four protrusions of the pin block are adapted to the wide part of the two grooves constituting the pin slot.

[0020] As a further solution, the recess is rectangular or semicircular or semi-elliptical.

[0021] As a further solution, the maximum depth of the recess is not less than 1mm.

[0022] As a further solution, 2-4 metal strips are included.

[0023] The shape of the metal strip includes one or two of straight line, right angle and “Fang” shape.

[0024] The manufacturing method of the mask frame includes the following steps:

[0025] Manufacturing the metal strip, and opening the groove at both ends of the metal strip;

[0026] Connecting the metal strips end to end to form a rectangular frame, and combining the groove at the end of the metal strip with the groove at the other end of the metal strip to form a pin slot;

[0027] Manufacturing a pin block adapted to the pin slot, and installing the pin block into the corresponding pin slot;

[0028] Welding the joint between the pin slot and the metal strip and the joint between the metal strips.

[0029] The mask device of the present application includes:

[0030] A mask plate; and

[0031] The mask frame;

[0032] The mask plate is connected to the mask frame.

[0033] 1) After the metal strips constituting the mask frame abut against each other, the metal strips are locked together by the pin block, so that in subsequent welding, the metal strips do not need to be additionally fixed, and the relative movement between the metal strips can be prevented, so that the welding seam is uniform and consistent, and the quality of the mask frame is improved.

[0034] 2) The independent pin block design is used to connect two metal strips, so that when the metal strips are combined, the heavy metal strips do not need to be moved to realize the clamping of each other, the assembly difficulty can be greatly reduced, and the production efficiency is improved.

[0035] In addition, other additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structural schematic view of the mask frame of the present application;

[0037] Figure 2 It is an exploded view of the mask frame in Figure 1

[0038] Figure 3 It is a structural schematic view of the connecting end of the metal strip;

[0039] Figure 4 It is another structural schematic view of the connecting end of the metal strip;

[0040] Figure 5 It is a structural schematic view of the pin block for connecting two metal strips;

[0041] Figure 6 It is a schematic view of the recess of the pin block in different ways;

[0042] Figure 7 It is a schematic view of different embodiments of the mask frame structure.

[0043] In the figure: 1, metal strip; 10, pin slot; 11, first connecting end; 12, second connecting end; 100, recess; 101, narrow part; 102, wide part;

[0044] 2, pin block; 21, convex part; 22, recess. EMBODIMENT

[0045] ​To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. For reference, the following description and accompanying drawings are brief examples to help understand this invention, and are not intended to limit the technical scope of this invention. In other words, the embodiments described below may have various modifications, which fall within the scope of the technical concept of this invention. Those skilled in the art can easily understand the technical concept of this invention through the following description. The invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] This invention provides a mask frame, with... Figure 1 The diagram illustrates one structure of the mask frame of the present invention; see attached figure. Figure 1 The mask frame of the present invention will be described.

[0047] According to the present invention, the mask frame includes a plurality of metal strips 1, which are strip-shaped components cut from SUS420 stainless steel, SUS304 stainless steel, or Invar 36 alloy. In the mask frame, the plurality of metal strips 1 are sequentially joined end-to-end to form a rectangular frame. Grooves 100 are provided at both ends of each metal strip 1. Within the rectangular frame, the grooves 100 at the joint ends of any two joining metal strips 1 combine to form a pin groove 10.

[0048] For example, Figure 3 The diagram shows the structural arrangement of two abutting metal strips 1 with grooves 100 at their abutting ends. Figure 3 The first connecting end 11 shown in (a) belongs to one of the metal strips 1 in the aforementioned rectangular frame. Figure 3 The second connecting end 12 shown in (b) belongs to the rectangular frame and Figure 3 (a) The first connecting end 11 abuts against another metal strip 1, the side surface of the first connecting end 11 in the width direction abuts against the end face of the second connecting end 12 along the extension direction of its metal strip 1, and the grooves 100 at the two connecting ends combine to form Figure 3 Pin groove 10 shown in (c).

[0049] See Figure 3 (a) and Figure 3As shown in (b), the groove 100 has a narrow portion 101 and a wide portion 102. The narrow portion 101 corresponds to the narrower spatial portion of the groove 100, and the wide portion 102 corresponds to the wider spatial portion of the groove 100. Here, "narrower spatial portion" and "wider spatial portion" refer to the spatial dimensions along the extension direction of the metal strip 1 or along the width direction of the metal strip 1, not the depth of the groove 100 in the thickness direction of the metal strip 1. The wide portion 102 of any groove 100 is further away from its narrow portion 101 from the other groove 100 it is joined to, so as to... Figure 3 (a) and Figure 3 In example (b), the narrow portion 101 is located near the mating surface between its connecting end and another connecting end, while the wide portion 102 is located further away from the mating surface than the narrow portion 101, forming a groove 100 whose size gradually increases from the mating surface towards the inside of the connecting end. See also Figure 3 As shown in (c), the pin groove 10 formed by the combination of the two grooves 100 is narrow in the middle and wide at both ends.

[0050] Figure 2 It shows Figure 1 An exploded view showing some structural components of the mask frame disassembled. See also... Figure 2 As shown, the mask frame also includes several pin blocks 2, each pin block 2 having a shape and size adapted to the pin groove 10 and being accommodated within the pin groove 10. (See attached image) Figure 5 The diagram shows one structure of pin 2. See Appendix. Figure 5 As shown, each of the two symmetrical sides of the pin block 2 has two outwardly protruding protrusions 21, and between the two protrusions 21 is an inwardly recessed recess 22. The two recesses 22 of the pin block 2 are adapted to the narrow portions 101 of the two grooves 100 that form the pin groove 10, and the four protrusions 21 of the pin block 2 are adapted to the wide portions 102 of the two grooves 100 that form the pin groove 10. In this way, after the pin block 2 is inserted into the pin groove 10, the two metal strips 1 can be locked together.

[0051] Furthermore, pin 2 is welded to metal strip 1 and metal strip 1 to each other at their joints to enhance the reliability of connections on the mask frame and reduce deformation caused by subsequent mesh welding of the mask plate. Various welding methods can be used, such as laser welding, electron beam welding, friction stir welding, and ultrasonic welding.

[0052] In the traditional manufacturing method of manufacturing the mask frame by welding, when welding the rectangular frame composed of metal strips, the metal strips are not locked with each other, so that the metal strips abutting each other are easily separated or deflected due to external force, which not only affects the smooth welding, but also causes the rectangular shape of the frame to be distorted, and affects the product precision of the mask frame. Therefore, when welding the mask frame, it is often necessary to use a positioning tool to assist in fixing each metal strip constituting the rectangular frame, and different positioning tools need to be prepared for different specifications of mask frames. In addition, it is also difficult to clamp the metal strips into the positioning tool due to the heavy weight of the metal strips.

[0053] The mask frame of the present application, by means of the cooperation of the pin slot 10 and the pin block 2, the metal strips 1 constituting the mask frame are locked together by the pin block 2 after abutting each other, and during subsequent welding, the metal strips 1 do not need to be fixed additionally, and the relative movement between the metal strips 1 can be prevented, so that the welding seam is uniform and consistent, and the quality of the mask frame is improved.

[0054] In addition, the independent pin block 2 is also considered based on the assembly difficulty. Assuming that the pin block 2 does not exist independently, but is a buckle structure provided on one of the metal strips 1, then during assembly of the rectangular frame, the entire metal strip 1 needs to be lifted and the buckle of the metal strip 1 needs to be clamped into the groove 100 on the other metal strip 1. Since the metal strip 1 is a pure metal solid structure, it is heavy, and the fitting gap between the two metal strips 1 is very small, so this structure will greatly increase the assembly difficulty, slow down the efficiency, and is very unfavorable for mass production. In view of this problem, the mask frame of the present application uses an independent pin block 2 to connect the two metal strips 1, and when assembling the two metal strips 1, only the pin block 2 needs to be taken and clamped into the pin slot 10 formed by the grooves 100 on the two metal strips 1, without the need to move the entire metal strip 1 to clamp the two metal strips 1 at the ends, which can greatly reduce the assembly difficulty and improve the production efficiency.

[0055] In addition, referring to the drawings Figure 3In the example, the pin groove 10 on the metal strip 1 should be located on the upper or lower side of the rectangular frame composed of the metal strips 1, and the depth direction of the pin groove 10 should be consistent with the thickness direction of the metal strip 1. During assembly, the rectangular frame composed of the metal strips 1 is usually placed flat on the workbench with the pin groove 10 facing upwards, which helps to smoothly insert the pin block 2. More importantly, in this design, the weld seam created after the pin block 2 is inserted into the pin groove 10 extends along the thickness direction of the metal strip 1, and the depth of the seam corresponds to the depth of the subsequent welding. While ensuring that the pin block 2 provides reliable locking for the two metal strips 1, the maximum depth of the seam is only the thickness of the metal strip 1. Various welding methods such as laser welding, electron beam welding, friction stir welding, and ultrasonic welding can be applied, and the reliability of the welding is guaranteed.

[0056] Within the rectangular frame formed by the metal strip 1, the two grooves 100, which together form the pin groove 10, are interconnected on their facing sides. See Appendix. Figure 3 As shown in (c), the narrow section in the middle of the corresponding pin groove 10 is the interconnected portion. The aforementioned interconnected design makes the pin groove 10 a single unit, providing accommodating space for the middle part of the pin block 2. Here, the depth of the narrow section in the middle of the pin groove 10 along the thickness direction of the metal strip 1 does not necessarily have to be the same as the depth of the width portion 102 of the two grooves 100 that make up the pin groove 10, that is, it can be less than or greater than the depth of the width portion 102 of the grooves 100. Correspondingly, the portion of the pin block 2 corresponding to the narrow section in the middle of the pin groove 10 forms a recess or protrusion that matches that portion.

[0057] See appendix Figure 4 As shown, in some embodiments, the groove 100 on the metal strip 1 extends through the metal strip 1 in the thickness direction of the metal strip 1. Figure 4 The first connecting end 11 of the metal strip 1 shown in (a) is Figure 4 (b) As shown, after the second connecting ends 12 of the metal strip 1 abut against each other, the grooves 100 at the two connecting ends combine to form a pin groove 10 that runs through the upper and lower surfaces of the rectangular frame. Correspondingly, the pin block 2 has the same thickness as the metal strip 1. After the pin block 2 is inserted into the pin groove 10, the same seam is formed on the upper and lower surfaces of the rectangular frame. When the thickness of the metal strip 1 is small, it is possible to choose to weld the seam from only one surface of the rectangular frame, and the welding depth is equal to the thickness of the metal strip, so as to improve production efficiency.

[0058] See appendix Figure 3As shown, in some embodiments, the depth of the groove 100 on the metal strip 1 along the thickness direction of the metal strip 1 is only a portion of the thickness of the metal strip 1, that is, the groove 100 does not penetrate the metal strip 1 in its depth direction. Preferably, the depth of the groove 100 along the thickness direction of the metal strip 1 is half the thickness of the metal strip 1. Correspondingly, the thickness of the pin 2 should also be a portion of the thickness of the metal strip 1, consistent with the depth of the groove 100. After the pin 2 is inserted into the pin groove 10, different seams are formed on the upper and lower surfaces of the rectangular frame. The seam on one surface includes the seam between the pin 2 and the edge of the groove 100 and the seams on both sides of this part of the seam formed by the butt joint of two metal strips 1. The seam on the other surface is entirely formed by the butt joint of two metal strips 1. When welding, it is necessary to flip the frame and weld the seams on both sides separately. It is worth noting that in Figure 3 In the example shown, since the pin groove 10 does not penetrate the upper and lower surfaces of the rectangular frame, the mask frame can still be moved freely without flipping after the pin block 2 is inserted into the pin groove 10, and the pin block 2 will not fall out of the pin groove 10, providing convenience for situations requiring handling during production. Furthermore, since the welds on both sides of the same connection point of the mask frame are different, the impact of the weld itself on the mechanical properties of the mask frame can be reduced, improving the reliability of the welding.

[0059] Appendix Figure 6 The diagram shows structural schematics of pin 2 under different implementation methods. See Appendix. Figure 6 As shown in (a), 6(b), and 6(c), the shape of the recess 22 on the pin block 2 can be rectangular, semi-circular, or semi-elliptical, and can be selected according to requirements and processing difficulty in actual production. Correspondingly, the shape of the narrow part in the middle of the pin groove 10 formed by the combination of the grooves 100 on the two metal strips 1 should be consistent with the shape of the recess 22 on the pin block 2. Considering the reliability of the connection between the pin block 2 and the two metal strips 1, the maximum depth of the recess 22 is not less than 1 mm, preferably 3 mm to 5 mm. For example, the maximum depth of the recess 22 can be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or more.

[0060] It should be noted that before the mask frame is welded, the fitting clearance between the pin block 2 and the pin slot 10 is set to be very small, and the unilateral fitting clearance should be controlled below 0.5 mm. To ensure that the relative movement between the two metal strips 1 is smaller after the pin block 2 is inserted into the pin slot 10, the unilateral fitting clearance should be controlled even smaller, preferably below 0.1 mm. Exemplarily, the unilateral fitting clearance between the pin block 2 and the pin slot 10 is 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, etc. The maximum depth of the recess 22 on the pin block 2 and the size of the narrow part in the middle of the pin slot 10 should be selected according to the fitting clearance between the pin block 2 and the pin slot 10. When the fitting clearance between the pin block 2 and the pin slot 10 is large, the maximum depth of the recess 22 on the pin block 2 should also be selected as a larger value, and the corresponding narrow part in the middle of the pin slot 10 should be narrower; but when the fitting clearance between the pin block 2 and the pin slot 10 is very small, there is no need to select a recess 22 with a smaller depth and the corresponding narrow part of the pin slot 10.

[0061] See the appendix Figure 7 As shown, the mask frame includes 2 to 4 metal strips 1, and the metal strips 1 in the mask frame have various shape combinations, such as a straight metal strip 1, a right-angled metal strip 1, and a "C"-shaped metal strip 1. The mask frame contains one or two of the above different-shaped metal strips 1.

[0062] Exemplarily, Figure 7 (a) shows a mask frame made of a straight metal strip 1a and a "C"-shaped metal strip 1b; Figure 7 (b) shows a mask frame made of two right-angled metal strips 1c and 1d; Figure 7 (c) shows a mask frame made of two straight metal strips 1e, 1f and a right-angled metal strip 1g; Figure 7 (d) shows a mask frame made of four straight metal strips igh, 1i, 1j and 1k.

[0063] In addition, the surfaces where the two metal strips 1 abut against each other do not have to be the side surface in the width direction of one metal strip 1 and the end surface in the extending direction of the other metal strip 1, and it can also be the end surfaces of the two metal strips 1 abutting against each other. Exemplarily, Figure 7 (e) shows a mask frame in which the end surfaces of the four metal strips 1m, 1n, 1p, 1q are all 45° inclined surfaces, and the metal strips 1 abut against each other with the end surfaces.

[0064] In addition, according to the present invention, the number of metal strips 1 included in the mask frame is not limited to Figure 7In addition to the various situations shown in the figures, more metal strips 1 can also be used to form the mask frame. For example, the metal strip 1 forming any one frame edge of the mask frame can be composed of multiple shorter metal strips 1, which are also connected by the pin block 2.

[0065] The mask frame in the present application has been described in detail above, but the present application is not limited thereto, and also includes a method for manufacturing the mask frame. The method for manufacturing the mask frame comprises the following steps:

[0066] I. Manufacturing the metal strip

[0067] The material for manufacturing the metal strip 1 is selected from a raw material plate purchased or a remaining material after the mask frame is integrally manufactured from the plate. The material of the raw material plate is preferably SUS420 and SUS304 stainless steel or Invar 36, etc.

[0068] The raw material plate is cut, milled or otherwise processed into a linear or right-angled or "H" shaped metal strip 1, and a groove 100 is formed at both ends of the metal strip 1. When the groove 100 is formed, the two metal strips 1 are abutted to each other in a manner of forming the mask frame, and a predetermined pin groove 10 is formed at the abutted position of the two metal strips 1. Compared with forming the groove 100 on a single metal strip 1, this method can ensure that the groove 100 formed has higher precision, so that the pin block 2 can be smoothly fitted into the pin groove 10 even if the single side fitting gap between the pin block 2 and the pin groove 10 is small.

[0069] The structure of the metal strip 1 and the groove 100 has been described in detail above, and will not be described again here.

[0070] II. Manufacturing the pin block

[0071] When the pin block 2 is manufactured, a small piece of remaining material which is not large enough to be processed into a metal strip 1 is preferably used for processing, which can reduce material waste and material cost. According to the pin groove 10 formed by the joint of the grooves 100 on the two metal strips 1, a pin block 2 is processed by cutting, milling or other methods.

[0072] The single side fitting gap between the pin block 2 and the pin groove 10 is controlled to be less than 0.5 mm, and is preferably 0.05 mm to 0.1 mm. This will not increase the assembly difficulty, and can ensure that the relative movement between the two metal strips 1 after the pin block 2 is fitted into the pin groove 10 is smaller.

[0073] III. Assembly

[0074] A plurality of metal strips 1 are connected end to end to form a rectangular frame, and the groove 100 at the end of the metal strip 1 and the groove 100 at the end of another metal strip 1 connected thereto form a pin groove 10.

[0075] The prepared pin block 2 is installed into the corresponding pin slot 10, and the metal strips 1 separated from each other by the pin block 2 are connected into an integral rectangular frame.

[0076] Four, welding

[0077] The assembled rectangular frame is placed on the worktable of a welding device, and the pin slots 10 and the metal strips 1 and the metal strips 1 are welded. The welding is performed along the joints between the pin slots 10 and the metal strips 1 and the metal strips 1.

[0078] For Figure 3 and Figure 4 The different groove 100 structures shown in the embodiments and the structures of the pin block 2 matched with the pin slot 10 formed in combination with the groove 100 can be welded by using double-sided welding and single-sided welding respectively.

[0079] For example, in the embodiment shown in the above Figure 3 After the pin block 2 is installed into the pin slot 10, different joints are formed on the upper and lower surfaces of the rectangular frame, and the welding is performed by using double-sided welding. During the welding, the welding depth is controlled to be half of the thickness of the metal strip 1, the joints on the upward surface of the rectangular frame are welded first, then the rectangular frame is turned over, and the joints on the other surface are welded by controlling the same welding depth.

[0080] For example, in the embodiment shown in the above Figure 4 After the pin block 2 is installed into the pin slot 10, the same joints are formed on the upper and lower surfaces of the rectangular frame, and the welding is performed by using single-sided welding, and the welding depth is controlled to be at least the thickness of the rectangular frame, and the welding of the joints is completed at one time without turning over the rectangular frame.

[0081] The production of the mask frame by using the method can realize the secondary utilization of the production scraps with small size, improve the utilization rate of the scraps, and reduce the production cost. In addition, the damage of the welding to the metal characteristics has little effect on the mechanical performance of the mask frame, and the mechanical performance of the prepared mask frame is good.

[0082] In addition, the present application also includes a mask device prepared from the mask frame. The mask device is formed by stretching and welding a mask plate on the mask frame as a carrier frame. The mask plate includes a general metal mask plate (CMM) and a precision metal mask plate (FMM).

[0083] Finally, it needs to be emphasized again that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application but not to limit them, and although the embodiments of the present application are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the embodiments of the present application can still be modified or replaced equivalently, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A mask frame, characterized by, The application relates to a mask frame, which comprises the following components: a plurality of metal strips (1) which are sequentially abutted to form a rectangular frame, the two ends of the metal strip (1) are provided with grooves (100), the abutted ends of any two abutted metal strips (1) are provided with grooves (100) which are combined to form a pin groove (10); the groove (100) is provided with a narrow part (101) and a wide part (102), the wide part (102) of any groove (100) is farther away from the other groove (100) combined therewith than the narrow part (101), and the pin groove (10) formed by the combination of the two grooves (100) is narrow in the middle and wide at the two ends; a plurality of pin blocks (2) which are provided with shapes and sizes matched with the pin groove (10) and are accommodated in the pin groove (10); the pin block (2) and the metal strip (1) and the metal strip (1) are welded to each other at the abutting position; wherein the metal strip (1) is made of the remaining material after the mask frame is integrally formed by processing raw plate material; the grooves (100) are formed at the two ends of the metal strip (1), two metal strips (1) are abutted to form a mask frame, and the predetermined pin groove (10) is formed at the abutting position of the two metal strips (1) by one-time processing; the pin block (2) is made of small pieces of remaining material which are not enough to be processed into the metal strip (1), the pin block (2) is processed according to the pin groove (10) formed by the combination of the grooves (100) on the two metal strips (1), the single-side fitting clearance between the pin block (2) and the pin groove (10) is controlled to be 0.05mm-0.1mm, the welding is performed by using double-sided welding, the welding depth is controlled to be half of the thickness of the metal strip (1), the seams on the upward face of the rectangular frame are welded first, then the rectangular frame is turned over, the seams on the other face turned over are welded by controlling the same welding depth; wherein the depth of the groove (100) in the thickness direction of the metal strip (1) is half of the thickness of the metal strip (1), the pin block (2) is accommodated in the pin groove (10), different seams are formed on the upper and lower faces of the rectangular frame, the seam on one face comprises the seam between the pin block (2) and the edge of the groove (100) and the seams generated by the abutting of the two metal strips (1) on the two sides of the seam, the seam on the other face is completely the seam generated by the abutting of the two metal strips (1), and the seams on the two faces are welded respectively to form different welding seams on the upper and lower faces. The pin groove (10) is located on the upper face or the lower face of the rectangular frame, and the depth direction of the pin groove (10) is consistent with the thickness direction of the metal strip (1); the two grooves (100) combined to form the pin groove (10) are mutually penetrated on the face facing each other. One group of two opposite sides of the pin block (2) is provided with two outward protruding convex parts (21) respectively, and the two convex parts (21) are provided with an inward recessed concave part (22) therebetween; the two concave parts (22) of the pin block (2) are matched with the narrow parts (101) of the two grooves (100) forming the pin groove (10); and the pin block (2) is provided with a plurality of pin blocks (2) which are matched with the pin groove (10) and are accommodated in the pin groove (10). ​ ​ ​ ​ ​ ​ ​ ​ 2. The mask frame of claim 1, wherein, ​ ​ 3. The mask frame of claim 1, wherein, ​ ​ The four protrusions (21) of the pin block (2) are matched with the wide parts (102) of the two grooves (100) constituting the pin slot (10).

4. The mask frame of claim 3, wherein, The recess (22) is in the shape of a rectangle, a semicircle or a semi-ellipse.

5. The mask frame of claim 3, wherein, The maximum depth of the recess (22) is not less than 1 mm.

6. The mask frame of claim 1, wherein, The number of the metal strips (1) is 2-4. The shape of the metal strip (1) includes one or two of a straight line, a right angle and a "U" shape.

7. The manufacturing method of the mask frame as claimed in any one of claims 1-6, comprising the following steps: manufacturing the metal strip (1) and opening the groove (100) at both ends of the metal strip (1); connecting the metal strips (1) end to end to form a rectangular frame, and combining the groove (100) at the end of the metal strip (1) with the groove (100) at the end of another metal strip (1) connected thereto to form the pin slot (10); manufacturing the pin block (2) matched with the pin slot (10) and installing the pin block (2) into the corresponding pin slot (10); welding the pin slot (10) and the metal strip (1) and the joint between the metal strips (1).

8. A masking device, characterized by comprise: a mask plate; and the mask frame as claimed in any one of claims 1-6; the mask plate is connected to the mask frame. ​

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