Photo frame backboard connecting nail, manufacturing process and punching die

Abstract

The present invention discloses a photo frame backboard connecting nail, a manufacturing process and a punching die, wherein the connecting nail comprises a binding part for inserting into the photo frame backboard and a mounting part for connecting with a fixing member, the binding part is hollow, and the mounting part is connected to the top of the binding part; wherein the binding part comprises a spike section and an extension section, the spike section is provided with a plurality of spikes, the upper end of the extension section is connected to the mounting part, the lower end of the extension section is connected to the upper end of the spike section, and the diameter of the extension section is larger than the diameter of the spike section. The connecting nail of the present invention can allow the backboard waste to be discharged upward smoothly during binding, which is conducive to reducing the difficulty of binding and has a good binding effect.

Description

Technical Field

[0001] The invention relates to a photo frame accessory, in particular to a photo frame backboard connecting nail, a manufacturing process and a punching die. Background Art

[0002] The photo frame is mainly used for positioning the four sides of the photo, which is beneficial to protect the photo from damage and also has an aesthetic effect. The photo frame is usually hollow inside. When in use, the corresponding photo is placed in the blank space, and the position of the photo is fixed by locking the back plate of the photo frame; the specific locking method is to rotate the spring (or baffle) on the back plate so that the free end of the spring is clamped on the back of the photo frame to achieve the locking of the back plate, thereby achieving the purpose of fixing the photo. In addition, during the use of the photo frame, there is also a way to hang the photo frame for viewing by hooking; when the photo frame needs to be hung, the hook is rotated so that the action part of the hook matches the hanging part of the vertical surface (wall) so as to hang it up, and the rotation angle of the hook can also be adjusted to achieve the purpose of adjusting the photo frame. In order for the photo frame to be used normally, the above-mentioned spring and hook need to be connected to the back plate of the photo frame through a connecting nail, and the spring and hook can rotate for the convenience of users.

[0003] In the prior art, the connection between the spring clip and the hook and the photo frame back plate is generally manually installed on the photo frame back plate by screws or rivets, but such a connection method is difficult to achieve both stable connection and flexible rotation requirements at the same time, and multiple spring clips are generally arranged on the photo frame back plate, and it is difficult to ensure the uniform locking standard of each spring clip by using screws and rivets for installation. To solve this problem, the invention patent with the authorization announcement number CN103381039B discloses a "fixing member for connecting with the photo frame back plate and its manufacturing method", wherein the fixing member includes a rotating part and a fixed part, the rotating part is rotatably connected with the fixed part, the spring clip or the hook is connected with the rotating part, and the spring clip or the hook is flexibly rotated; and the fixed part is composed of petal-shaped spikes, and the spikes are uniformly inserted into the photo frame back plate through relevant equipment to achieve a fixed connection with the photo frame back plate. In addition, the utility model patent with authorization announcement number CN205053674U discloses a "four-hole hook for a photo frame", in which the binding tip fixedly connected to the back plate of the photo frame is also similar to the petal-shaped spikes, which are directly inserted into the back plate of the photo frame to achieve a fixed connection.

[0004] The above-mentioned comparative documents all use petal-shaped spikes inserted into the back plate of the photo frame to achieve a fixed connection, but there are still the following disadvantages: after the spikes are inserted into the back plate of the photo frame, due to the limited space between the spikes, the back plate waste generated during binding is accumulated between the spikes and is difficult to discharge upwards, which is not conducive to the treatment of the back plate waste and increases the difficulty of inserting the spikes into the back plate of the photo frame during binding. Summary of the invention

[0005] The invention aims to overcome the deficiencies of the prior art and provide a photo frame backboard connecting nail, which can allow backboard waste to be discharged upward smoothly during binding, thereby reducing the difficulty of binding and achieving a good binding effect.

[0006] Another object of the present invention is to provide a manufacturing process for photo frame back panel connecting nails.

[0007] Another object of the present invention is to provide a punching die for connecting nails of a photo frame back panel.

[0008] The purpose of the present invention is achieved through the following technical solutions:

[0009] A photo frame backboard connecting nail, characterized in that it includes a binding portion for inserting into a photo frame backboard and a mounting portion for connecting to a fixing piece, wherein the binding portion is hollow and the mounting portion is connected to the top of the binding portion; wherein the binding portion includes a spike section and an extension section, wherein the spike section is provided with a plurality of spikes, wherein the upper end of the extension section is connected to the mounting portion, and the lower end of the extension section is connected to the upper end of the spike section, and the diameter of the extension section is larger than the diameter of the spike section.

[0010] The working principle of the above-mentioned photo frame back panel connecting nail is:

[0011] The mounting portion is connected with a spring sheet or a hook or other rotating member to form a back plate fixing member. During binding, the binding portion in the connecting nail is pressed onto the photo frame back plate by a binding device, thereby realizing the installation of the back plate fixing member. During the binding process, the spike segment in the binding portion is first inserted into the photo frame back plate, and a piece of back plate waste is cut out on the photo frame back plate during the insertion of the spike segment, and the back plate waste is located in the spike segment; then, the extension segment of the binding portion is inserted into the photo frame back plate, at this time, since the diameter (including the inner diameter and the outer diameter) of the extension segment is larger than the diameter of the spike segment, that is, the space in the extension segment is larger than the space in the spike segment, so during the insertion of the extension segment, the back plate waste located in the spike segment will be gradually squeezed and moved upward into the extension segment, and since the internal space of the extension segment is larger than the waste, no resistance will be generated to the upward movement of the waste, so that the spike segment can be more smoothly inserted further downward to a greater depth, and finally the spikes of the spike segment are bent outward to achieve locking with the back plate.

[0012] In a preferred embodiment of the present invention, the connection between the lower end of the extension section and the upper end of the spike section is rounded.

[0013] In a preferred embodiment of the present invention, there are four spikes on the spike section, and the four spikes are arranged at equal intervals along the circumferential direction.

[0014] In a preferred embodiment of the present invention, along the direction in which the spike segment is inserted into the back plate of the photo frame, the spikes on the spike segment are gradually extended outward from top to bottom.

[0015] According to a preferred embodiment of the present invention, the mounting portion is provided with a locking groove for connecting and mounting with the fixing member.

[0016] In a preferred embodiment of the present invention, the mounting portion comprises a retaining ring and a limit block group; the retaining ring is arranged at the top of the extension section, and the outer diameter of the retaining ring is larger than the outer diameter of the extension section; the limit block group comprises a plurality of limit blocks extending outwardly in a radial direction, the plurality of limit blocks are arranged below the retaining ring, and the locking groove is formed between the plurality of limit blocks and the retaining ring.

[0017] Preferably, the limit block is an accumulation block extruded from the extension section, and the accumulation block is formed by scraping, extruding and stacking the outer circumferential surface of the extension section from bottom to top by a tool.

[0018] Preferably, the number of the limit blocks in the limit block group is 2-10, and the limit blocks are axially symmetrically arranged on the outer circumferential surface of the extension section.

[0019] A manufacturing process for photo frame back plate connecting nails, characterized by comprising the following steps:

[0020] (1) placing a substrate sheet to be processed on a feeding mechanism, wherein the feeding mechanism drives the substrate sheet to pass through a plurality of groove punching stations in sequence, thereby forming a plurality of groove bodies arranged at equal intervals on the substrate sheet;

[0021] (2) The feeding mechanism continues to drive the substrate sheet forward to the punching station, and punches the spikes, thereby forming a punched body connected to the substrate sheet; wherein the processing device at the punching station includes a pyramid-shaped punching knife and a shaping die arranged below the substrate sheet, the shaping die includes a holding section and a contraction section, the holding section is connected above the contraction section, and the inner diameter of the holding section matches the outer diameter of the groove body, and the inner diameter of the contraction section is smaller than the inner diameter of the holding section; during processing, the punching knife punches from top to bottom in the groove body, and the multiple blades on the punching knife cut the side wall of the lower part of the groove body to form multiple separate spikes, and when continuing to move downward, the cut spikes are squeezed outward in the contraction section to achieve the expansion of the spikes, thereby forming a spike section matching the inner diameter of the contraction section, and at the same time, because the upper part of the groove body is located in the holding section, its inner diameter remains unchanged, so that an expansion section with a diameter larger than that of the spike section is formed, and the processing of the punched body is completed;

[0022] (3) Finally, driven by the feeding mechanism, the punched body on the substrate sheet moves to the punching station, and a plurality of punched parts are punched out by the punching tool. After leaving the substrate sheet, individual connecting nails are formed, thereby completing the processing and manufacturing of the photo frame back panel connecting nails.

[0023] A punching die for connecting nails of a photo frame back panel, characterized in that it comprises a punching knife and a forming die, wherein the punching knife and the forming die are both arranged at a punching station, and the punching knife is located above the forming die; wherein the punching knife is in a pyramid shape, and the side edges of the pyramid constitute the blade of the punching knife; the forming die comprises a retaining section and a contraction section, wherein the retaining section is connected above the contraction section, and the inner diameter of the retaining section matches the outer diameter of a groove body, and the inner diameter of the contraction section is smaller than the inner diameter of the retaining section.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the binding part of the present invention, since the diameter of the extension section is larger than that of the spike section, that is, the space in the extension section is larger than that in the spike section, the extension section has a looser space than the spike section, and the extrusion resistance to the backboard waste is smaller. Therefore, in the process of inserting the extension section into the backboard of the photo frame, the backboard waste located in the spike section will gradually move upward to the extension section with a larger space; at the same time, since the diameters of the extension section and the spike section are different, a shape with a small lower part and a large upper part is formed, so that the force on the backboard waste is more concentrated during the binding process, so that the backboard waste is easier to move upward. In this way, during the binding process, the backboard waste is discharged upward as the binding section is inserted, making the binding process of the binding section smoother, and is conducive to reducing the extrusion force during binding, thereby reducing the difficulty of binding.

[0026] 2. During the binding process, since the internal space of the extension section is larger than the waste material cut out by the spike section, there is no resistance to the upward movement of the waste material, so that the spike section can penetrate further downward to a greater depth more smoothly during binding, so that the spikes of the spike section are finally bent outward to achieve effective locking with the back plate of the photo frame, thereby improving the binding effect.

[0027] 3. The binding portion of the connecting nail of the present invention is provided with two extension sections and spike sections with different diameters, so that when matching and installing with the mounting hole of the fixing piece, a stacking block can be scraped and stacked on the outer cylindrical surface of the extension section with a larger diameter by a tool, thereby achieving the connection and installation with the fixing piece in cooperation with the mounting portion; by providing the extension section with a larger diameter, the connection and installation with the fixing piece is more convenient, the choice of connection methods is more, and the flexibility is good.

[0028] 4. The diameter of the binding part changes from small to large when inserted into the photo frame back plate, so that the outer wall of the larger diameter extension part exerts a greater extrusion force on the photo frame back plate, thereby making the entire connecting nail more stable on the photo frame back plate, further improving the stability of the connecting nail and the photo frame back plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1-Figure 3 This is a schematic structural diagram of a first specific embodiment of the photo frame back plate connecting nail of the present invention, wherein: Figure 1 For the main view (stacked blocks are not formed), Figure 2 Another main view (the stacking block has been formed), Figure 3 This is the main view after installation with the fixings.

[0030] Figure 4 It is a front structural schematic diagram of a second specific embodiment of the photo frame back panel connecting nail of the present invention.

[0031] Figure 5 The present invention is a schematic diagram of the manufacturing process of the photo frame back panel connecting nails.

[0032] Figure 6 The figure is a schematic diagram of the front view of the processing mold of the photo frame back plate connecting nails of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto.

[0034] Example 1

[0035] See also Figure 1-Figure 3 The photo frame backboard connecting nail of this embodiment includes a binding portion for inserting into the photo frame backboard and a mounting portion 3 for connecting with a fixing member 4, wherein the binding portion is hollow and the mounting portion 3 is connected to the top of the binding portion. The binding portion includes a spike section 1 and an extension section 2, wherein the spike section 1 is provided with a plurality of spikes 1-1, the upper end of the extension section 2 is connected to the mounting portion 3, the lower end of the extension section 2 is connected to the upper end of the spike section 1, and the diameter of the extension section 2 is larger than the diameter of the spike section 1 (the diameter refers to the inner diameter and the outer diameter). In addition, the connection between the lower end of the extension section 2 and the upper end of the spike section 1 is rounded. In this way, the transition connection position between the extension section 2 and the spike section 1 is smoother, which makes it smoother when binding and inserting into the photo frame backboard, allowing the extension section 2 to be smoothly inserted into the photo frame backboard, thereby realizing the upward discharge of the backboard waste.

[0036] See also Figure 1-Figure 3In this embodiment, there are four spikes 1-1 on the spike section 1, and the four spikes 1-1 are arranged at equal intervals along the circumferential direction. The arrangement of four spikes 1-1 makes the layout of the spikes 1-1 more reasonable, and the spikes 1-1 can be fully inserted into the photo frame back plate, which is conducive to improving the stability of the entire connecting nail after insertion. Along the direction in which the spike section 1 is inserted into the photo frame back plate, the spikes 1-1 on the spike section 1 are gradually extended outward from top to bottom. By arranging such spikes 1-1, the top ends of the plurality of spikes 1-1 are all spread outward, so that after being inserted into the photo frame back plate to a certain depth, the spikes 1-1 can be smoothly bent outward (rather than inward) to achieve locking with the photo frame back plate, and the spikes 1-1 bent outward have a larger bite locking area and a larger locking force with the photo frame back plate, which has a better locking effect and effectively prevents falling off.

[0037] See also Figure 2-Figure 3 , the mounting portion 3 is provided with a locking groove 3-4 for connecting and installing with the fixing member 4. By providing the locking groove 3-4 on the mounting portion 3, it is convenient to connect with the fixing member 4 (spring sheet or hook or other parts); specifically, a mounting hole 4-1 is provided at the connection corresponding position on the fixing member 4, and the mounting portion 3 of the connecting nail is installed in the mounting hole 4-1 by extrusion or other means, and the inner edge of the mounting hole 4-1 extends into the locking groove 3-4, so as to realize the connection between the fixing member 4 and the mounting portion 3, and relative rotational movement can be realized. Further, the mounting portion 3 of this embodiment includes a snap ring 3-1 and a limit block group; the snap ring 3-1 is arranged at the top of the expansion section 2, and the outer diameter of the snap ring 3-1 is larger than the outer diameter of the expansion section 2; the limit block group includes a plurality of limit blocks extending outward in the radial direction, and the plurality of limit blocks are arranged below the snap ring 3-1, and the locking groove 3-4 is formed between the plurality of limit blocks and the snap ring 3-1. By providing such a locking groove 3-4, the inner edge of the mounting hole 4-1 of the fixing member 4 is locked between the clamping ring 3-1 and a plurality of limit blocks, thereby completing the installation of the connecting nail and the fixing member 4. The locking groove 3-4 is formed by the limit block and the clamping ring 3-1, which has a simple structure, is easy to process, is easy to manufacture, is conducive to reducing costs, and can also achieve installation with the fixing member 4.

[0038] See also Figure 2-Figure 3The limit block is a stacking block 3-2 squeezed out from the extension section 2, and the stacking block 3-2 is scraped and squeezed from the bottom to the top by a tool on the outer circumferential surface of the extension section 2. In this way, the stacking block 3-2 scraped by the tool is simple in structure and is produced from the material of the extension section 2 itself, without adding materials or setting up additional parts, and the design is very clever. At the same time, when installing with the fixing member 4, since there is no limit structure on the outer circumferential surface of the extension section 2 and the spike section 1 of the binding part, it can freely and smoothly pass through the installation hole 4-1 on the fixing member 4, thereby completing the pre-installation of the fixing member 4 and the connecting nail, and finally processing the stacking block 3-2 by the tool to complete the entire installation process; in this way, the entire installation process is very convenient, which is conducive to improving the installation efficiency and installation quality of the connecting nail and the fixing member 4.

[0039] See also Figure 2-Figure 3 The limit block group has two limit blocks, which are relatively arranged on the outer circumferential surface of the extension section 2. The two limit blocks are arranged to match the clamp ring 3-1, thereby limiting the position of the extension section 2, ensuring that it does not fall out of the fixing member 4, completing the connection and installation of the connecting nail and the fixing member 4, and ensuring that the fixing member 4 has a certain gap on the connecting nail, so that the extension section 2 can rotate relative to the fixing member 4 for installation and use. Of course, different numbers of limit blocks can also be set according to actual conditions and production needs, for example, three or four.

[0040] See also Figure 1-Figure 3 The working principle of the photo frame back panel connecting nail of this embodiment is:

[0041] The mounting portion 3 is connected with a spring sheet or a hook or other rotating member to form a back plate fixing member 4. During binding, the binding portion in the connecting nail is pressed onto the back plate of the photo frame by a binding device, thereby achieving the installation of the back plate fixing member 4. During the binding process, the spike segment 1 in the binding part is first inserted into the photo frame backboard, and a piece of backboard waste is cut out on the photo frame backboard during the insertion of the spike segment 1, and the backboard waste is located in the spike segment 1; then, the extension segment 2 of the binding part is inserted into the photo frame backboard. At this time, since the diameter (including the inner diameter and the outer diameter) of the extension segment 2 is larger than the diameter of the spike segment 1, that is, the space in the extension segment 2 is larger than the space in the spike segment 1, during the insertion of the extension segment 2, the backboard waste located in the spike segment 1 will be gradually squeezed and move upward into the extension segment 2. Since the internal space of the extension segment 2 is larger than the waste, no resistance is generated to the upward movement of the waste, so that the spike segment 1 can be further penetrated downward to a greater depth more smoothly, and finally the spikes 1-1 of the spike segment 1 are bent outward to achieve locking with the backboard.

[0042] See also Figure 5 and Figure 6 The manufacturing process of the photo frame back plate connecting nail of this embodiment includes the following steps:

[0043] (1) The substrate sheet 6 to be processed is placed on a feeding mechanism, and the feeding mechanism drives the substrate sheet 6 to pass through a plurality of groove punching stations in sequence, thereby forming a plurality of groove bodies 7 arranged equidistantly on the substrate sheet 6. In particular, along the moving direction of the substrate sheet 6, the diameter of the punching heads on the plurality of groove punching stations gradually decreases, and the punching depths of the plurality of groove punching stations gradually increase. During the punching process, the diameters of the plurality of groove parts are successively reduced, and the depths of the plurality of groove parts are gradually increased until the groove body 7 is formed. In this way, the groove body 7 is formed by multiple punching and stretching methods, which is conducive to improving the quality of the groove body 7 and avoiding the formation of waste products due to excessive stretching deformation.

[0044] (2) The feeding mechanism continues to drive the substrate sheet 6 to move forward to the punching station, and punches the spike 1-1, thereby forming a punched body 5 connected to the substrate sheet 6; wherein the processing device at the punching station includes a pyramid-shaped punching knife 8 and a shaping die 9 arranged below the substrate sheet 6, the shaping die 9 includes a holding section 9-1 and a contraction section 9-2, the holding section 9-1 is connected above the contraction section 9-2, and the inner diameter of the holding section 9-1 matches the outer diameter of the groove body 7, and the inner diameter of the contraction section 9-2 is smaller than the inner diameter of the holding section 9-1; During operation, the punching knife 8 punches from top to bottom in the groove body 7, and the multiple blades on the punching knife 8 cut the side wall of the lower part of the groove body 7 to form multiple individual spikes 1-1, and when continuing to move downward, the cut spikes 1-1 are squeezed outward in the contraction section 9-2 to achieve the expansion of the spikes 1-1, thereby forming a spike section 1 that matches the inner diameter of the contraction section 9-2. At the same time, since the upper part of the groove body 7 is located in the retaining section 9-1, its inner diameter remains unchanged, thereby forming an expansion section 2 with a diameter larger than the spike section 1, and completing the processing of the punching body 5.

[0045] (3) Finally, driven by the feeding mechanism, the punched body 5 on the substrate sheet 6 moves to the punching station, and a plurality of punched parts are punched out by the punching tool. After leaving the substrate sheet 6, individual connecting nails are formed, thereby completing the processing and manufacturing of the photo frame back panel connecting nails.

[0046] See also Figure 5Preferably, after the punching body 5 is formed, the feeding mechanism conveys the substrate sheet 6 to the expansion station, further expands and shapes the expanded spikes 1-1, and finally moves to the punching station for punching. Among them, an extrusion top piece 10 is provided on the expansion station, and the top of the extrusion top piece 10 is conical or a pyramidal shape matching the spikes 1-1 or other shapes with gradually increasing outer diameters from top to bottom. The top of the extrusion top piece 10 in this embodiment is conical (the top end is set flush). During processing, the extrusion top piece 10 is driven upward by the vertical driving mechanism, extends into the punching body 5, and squeezes the expanded spikes 1-1 outward under the side extrusion effect of the gradually increasing outer diameter, so that each spike 1-1 forms a posture of gradually extending outward from top to bottom, so that it can be effectively locked with the back plate of the photo frame during subsequent binding.

[0047] See also Figure 5 and Figure 6 The punching die of the photo frame back plate connecting nail of the present embodiment comprises a punching knife 8 and a shaping die 9, wherein the punching knife 8 and the shaping die 9 are both arranged at the punching station, and the punching knife 8 is located above the shaping die 9; wherein the punching knife 8 is in the shape of a pyramid, and the side edges of the pyramid constitute the blade of the punching knife 8; the shaping die 9 comprises a retaining section 9-1 and a contraction section 9-2, wherein the retaining section 9-1 is connected above the contraction section 9-2, and the inner diameter of the retaining section 9-1 matches the outer diameter of the groove body 7, and the inner diameter of the contraction section 9-2 is smaller than the inner diameter of the retaining section 9-1. In addition, in the actual production process, the punching die of the present embodiment is arranged at the punching station, and two vertical drive mechanisms are correspondingly provided, and the two vertical drive mechanisms are respectively connected to the punching knife 8 and the shaping die 9. When the groove body 7 on the substrate sheet 6 to be punched moves to the punching station, the vertical drive mechanism drives the shaping die 9 to move upward, so that the groove body 7 is located in the holding section 9-1 of the shaping die 9, and then the punching knife 8 moves downward under the drive of another vertical drive mechanism, thereby completing the punching and forming of the groove body 7, and finally forming the punched body 5. After the punching process is completed, the vertical drive mechanism drives the punching knife 8 and the shaping die 9 to move in the reverse direction so that the substrate sheet 6 continues to move forward to the next station.

[0048] Example 2

[0049] See also Figure 4The difference between this embodiment and the first embodiment is that the mounting portion 3 includes a snap ring 3-1 and a convex ring 3-3, the snap ring 3-1 is arranged above the convex ring 3-3, and the outer diameter of the convex ring 3-3 is larger than the outer diameter of the expansion section 2, and the area between the snap ring 3-1 and the convex ring 3-3 constitutes the locking groove 3-4. In this way, a complete locking groove 3-4 is formed to connect with the mounting hole 4-1 on the fixing member 4, and the connection effect is good. In this embodiment, in order to facilitate the assembly of the connecting nail and the fixing part 4, the convex ring 3-3 is a separately manufactured component; when the connecting nail and the fixing part 4 are assembled, the connecting nail is first inserted into the mounting hole 4-1 of the fixing part 4, and then the top of the connecting nail (the mounting part) is pressed into the mounting hole 4-1 by a clamping device, and then the convex ring 3-3 is put on the extension section 2 of the connecting nail from bottom to top. At this time, the convex ring 3-3 and the extension section 2 are interference fit, thereby realizing the limitation and assembly of the convex ring 3-3 and the clamping ring 3-1 to the mounting hole 4-1 of the fixing part 4.

[0050] Example 3

[0051] The difference between this embodiment and the first embodiment is that the mounting portion 3 and the fixing member 4 are connected by inlaying a concave rotating surface and a convex rotating surface. Specifically, the concave rotating surface can be arranged on the mounting portion 3, and the convex rotating surface can be arranged on the fixing member 4, and the concave rotating surface is composed of an inner concave groove, and the convex rotating surface is composed of an inner edge convex ring of the mounting hole 4-1 on the fixing member 4, so as to realize the connection between the two. In addition, the connection between the mounting portion 3 and the fixing member 4 can also be realized by other methods, and the details can be referred to the Chinese invention patent "fixing member for connecting with the back plate of a photo frame and its manufacturing method" with the authorization announcement number CN103381039B.

[0052] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A manufacturing process for photo frame back panel connecting nails, characterized in that: The photo frame back panel connecting nail comprises a binding portion for inserting into the photo frame back panel and a mounting portion for connecting with the fixing piece, the binding portion is hollow, and the mounting portion is connected to the top of the binding portion; wherein the binding portion comprises a spike section and an extension section, the spike section is provided with a plurality of spikes, the upper end of the extension section is connected to the mounting portion, the lower end of the extension section is connected to the upper end of the spike section, the diameter of the extension section is larger than the diameter of the spike section; the connection between the lower end of the extension section and the upper end of the spike section is rounded; the mounting portion is provided with a locking groove for connecting and installing with the fixing piece; the corresponding connection part on the fixing piece A mounting hole is provided, the mounting portion is installed in the mounting hole by extrusion or other means, and the inner edge of the mounting hole extends into the locking groove; the mounting portion includes a snap ring and a limit block group; the snap ring is arranged at the top of the extension section, and the outer diameter of the snap ring is larger than the outer diameter of the extension section; the limit block group includes a plurality of limit blocks extending outward in a radial direction, the plurality of limit blocks are arranged below the snap ring, and the locking groove is formed between the plurality of limit blocks and the snap ring; the limit blocks are stacked blocks extruded from the extension section, and the stacked blocks are formed by scraping, extruding and stacking from bottom to top on the outer cylindrical surface of the extension section by a tool; The manufacturing process comprises the following steps: (1) Placing a substrate sheet to be processed on a feeding mechanism, wherein the feeding mechanism drives the substrate sheet to pass through a plurality of groove punching stations in sequence, thereby forming a plurality of groove bodies arranged at equal distances on the substrate sheet; (2) The feeding mechanism continues to drive the substrate sheet forward to the punching station, and punches the spikes, thereby forming a punched body connected to the substrate sheet; wherein the processing device at the punching station includes a pyramid-shaped punching knife and a shaping die arranged below the substrate sheet, the shaping die includes a holding section and a contraction section, the holding section is connected above the contraction section, and the inner diameter of the holding section matches the outer diameter of the groove body, and the inner diameter of the contraction section is smaller than the inner diameter of the holding section; during processing, the punching knife punches from top to bottom in the groove body, and the multiple blades on the punching knife cut the side wall of the lower part of the groove body to form multiple separate spikes, and when continuing to move downward, the cut spikes are squeezed outward in the contraction section to expand the spikes, thereby forming a spike section matching the inner diameter of the contraction section. At the same time, since the upper part of the groove body is located in the holding section, its inner diameter remains unchanged, thereby forming an expansion section with a larger diameter than the spike section, and completing the processing of the punched body; (3) Finally, driven by the feeding mechanism, the punched body on the substrate sheet moves to the punching station, and a plurality of punched parts are punched out by the punching tool. After leaving the substrate sheet, individual connecting nails are formed, thus completing the processing and manufacturing of the photo frame back panel connecting nails.

2. The manufacturing process according to claim 1, characterized in that: The spike section has four spikes, which are arranged at equal intervals along the circumferential direction.

3. The manufacturing process according to claim 1, characterized in that: Along the direction in which the spike segment is inserted into the back plate of the photo frame, the spikes on the spike segment are gradually extended outward from top to bottom.

4. The manufacturing process according to claim 1, characterized in that: The number of the limiting blocks in the limiting block group is 2 to 10, and the limiting blocks are axially symmetrically arranged on the outer circumferential surface of the extension section.

Images