A process for forming a tree pruning shear blade

Abstract

The application discloses a tree branch scissors blade forming process, comprising the following steps: S100, plate preparation; S200, cutting blanking: cutting the whole plate into a blank; S300, edge folding: folding the blank, and the edge folding is a positioning piece; S400, red punching; S500, milling the edge folding: removing the edge folding and the edge folding of the semi-finished product after red punching; S600, milling the chamfer: processing the chamfer on the product; S700, deburring; S800, heat treatment: improving the hardness of the product; S900, surface treatment; wherein, the red punching step comprises: S410, heating the blade of the blank; S420, forging and pressing the heated blade to be plastic to form a blade edge; S430, naturally cooling the semi-finished product to improve the toughness of the product. The tree branch scissors blade forming process is reasonable in design, improves the blade edge density of the blade, guarantees the strength of the blade edge, and prolongs the service life of the blade.

Description

Technical Field

[0001] This invention relates to the field of twig shear blade manufacturing technology, and in particular to a twig shear blade forming process. Background Technology

[0002] Pruning shears are frequently used in landscaping, and the blade is an indispensable and important component of them.

[0003] The forming process of twig shear blades is a crucial manufacturing step that directly affects the tool's cutting performance and durability. The following are the general steps in forming twig shear blades: 1. Material Selection Material selection: High-carbon steel, stainless steel, or alloy steel are typically chosen, as these materials possess excellent hardness and wear resistance. At the same time, the material's machinability is also crucial for subsequent processing.

[0004] 2. Cutting and shaping Rough machining: The metal sheet or rod is initially shaped into the basic outline of the blade through cutting, sawing, or other methods.

[0005] Heat treatment: The blade is heat treated through processes such as quenching and tempering to increase its hardness and toughness, making it less prone to deformation or breakage during use.

[0006] 3. Finishing Grinding: The rough-machined cutting edge is ground to achieve the required size and shape. During the grinding process, grinding wheels of different grit sizes are used to gradually improve the precision of the cutting edge.

[0007] Polishing: Polishing the blade after grinding reduces friction and improves its rust resistance.

[0008] 4. Blade sharpening Edge grinding: Specialized equipment is used to finely grind the cutting edge of the blade to ensure a sharp edge, usually forming a certain cutting angle (such as 15-30 degrees) to facilitate effective cutting of branches.

[0009] 5. Surface treatment Rust prevention treatment: The blade surface is treated with chrome plating, spraying, and other methods to improve its corrosion resistance and durability, and extend its service life.

[0010] Step 4 involves creating a sharp cutting edge by cutting the edge. This method of forming the cutting edge greatly affects the lifespan of the blade and fails to meet the customer's quality standards.

[0011] Therefore, it is necessary to improve the existing process for forming the blades of tree branch shears. Summary of the Invention

[0012] The purpose of this invention is to overcome the defects in the existing technology and provide a forming process for tree branch shears blades, which improves the blade edge density, ensures the edge strength, and thus extends the service life of the blade.

[0013] To achieve the above technical effects, the technical solution of the present invention is as follows: a forming process for tree branch shear blades, comprising the following steps: S100, preparation of sheet material; S200, cutting and blanking: cutting the whole sheet material into blanks; S300, folding: folding the blanks, the folded edges serving as positioning parts; S400, hot stamping; S500, milling and flanging: removing the excess material from the hot-stamped semi-finished product by flanging and folding; S600, milling and chamfering: processing the semi-finished product to create chamfers; S700, deburring; S800, heat treatment: improving the product hardness; S900, surface treatment; wherein, the hot stamping step S400 includes: S410, heating the blade of the blank; S420, forging and plasticizing the heated blade to form the cutting edge; S430, allowing the semi-finished product to cool naturally, thereby improving the product toughness.

[0014] According to one embodiment of the present invention, between step S200 and step S300, the following steps are further provided: S210, drilling: removing the wire ends at the cutting joints on the blank; S220, double-sided grinding: removing the welding slag burrs cut on the product, and at the same time grinding the blank thin to ensure the material allowance for subsequent hot stamping; S230, demagnetizing: using a demagnetizing machine to remove the magnetism generated by the grinding process from the blank.

[0015] According to one embodiment of the present invention, a step is provided between step S500 and step S600: S510, manual deburring: using a polishing machine to manually remove the remaining residual burrs and grind out the cutting edge.

[0016] According to one embodiment of the present invention, step S900 includes the following steps: S910, surface grinding: removing the oxide layer generated on the surface of the product due to heat treatment and refining the cutting edge; S920, oiling: applying oil to the surface of the product to prevent rust.

[0017] According to one embodiment of the present invention, step S410 is implemented by a heating transmission assembly, which includes a heating track disposed between the folding die and the hot stamping die, and a conveying assembly for conveying the blank in the heating track. The heating track includes a limiting part and a heating part that are configured to cooperate with each other. The shank of the blank is disposed in the limiting part, and the cutting edge of the blank is disposed in the heating part.

[0018] According to one embodiment of the present invention, the conveying assembly includes a vibratory feeder, the heating track is arranged in a spiral shape, and the heating part and the limiting part are arranged in inner and outer rings.

[0019] According to one embodiment of the present invention, the positioning element is a positioning post, and at least two positioning posts are radially offset from each other on the heating track; the limiting part is provided with a guide rail that limits and cooperates with the positioning posts.

[0020] According to one embodiment of the present invention, the limiting part is provided with a first limiting groove for accommodating the handle, and the heating part is provided with a second limiting groove for accommodating the blade. The first limiting groove and the second limiting groove cooperate to heat and transfer the blank.

[0021] According to one embodiment of the present invention, a plurality of heating wires are provided in the side wall of the second limiting groove, the heating part is heat-conducting, and the limiting part is heat-insulating.

[0022] According to one embodiment of the present invention, a storage track is provided at the outlet of the heating track, and a feeding track is provided at the inlet of the heating track; it also includes a robot arm, which is used to place the folded blank on the feeding track and to pick up the blank on the storage track and place it into the hot stamping die.

[0023] According to one embodiment of the present invention, step S420 is implemented by a hot stamping die, including: a fixed lower die and a lifting upper die. The lower die is provided with a groove for placing the semi-finished product completed in step S300, and the upper die is provided with a punch for stamping the cutting edge of the semi-finished product. A casting receiving groove is provided on the side of the groove adjacent to the cutting edge.

[0024] According to one embodiment of the present invention, the tool holder is provided with a ring for easy assembly, and the groove is provided with a limiting cone that limits and cooperates with the ring.

[0025] According to one embodiment of the present invention, the groove is provided with a limiting wall that limits and cooperates with the side wall of the knife handle.

[0026] According to one embodiment of the present invention, the upper mold is provided with a pressure plate for lifting, and the punch is inserted into the pressure plate. The punch has two working positions. In the first working position, when the mold is opened, the pressure plate descends relative to the punch, and the bottom end of the punch is not lower than the bottom end of the pressure plate. In the second working position, when the mold is closed, the pressure plate rises relative to the punch, and the bottom end of the punch is lower than the bottom end of the pressure plate. The punch is forged and pressed against the cutting edge of the semi-finished product. According to one embodiment of the present invention, a pressure block is fixedly provided on the pressure plate, and the pressure block cooperates with the bottom of the groove to fix the semi-finished product in the groove.

[0027] According to one embodiment of the present invention, the pressure block is provided with an inner concave hole for accommodating the limiting cone.

[0028] According to one embodiment of the present invention, the lower mold is provided with a guide groove, and the upper mold is provided with a guide protrusion that slides in cooperation with the guide groove.

[0029] The advantages and beneficial effects of this invention are as follows: The forming process of the branch shears blade of this invention is reasonably designed. By heating the blade and then forging the heated blade, the forged blade has a higher density and therefore higher strength compared to the existing technology of cutting the blade edge, thus extending the service life of the blade. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the open state of the red-hot stamping die in this invention; Figure 2 This is a schematic diagram of the closed state of the red-hot stamping die in this invention; Figure 3 This is a partial top view of the lower mold; Figure 4 This is a structural diagram of the finished product; Figure 5 This is a schematic diagram of the blank structure; Figure 6 This is a schematic diagram of the heating transfer component; Figure 7 This is a schematic diagram of the heating track structure; Figure 8 This is a schematic diagram of the structure in which the heating part and the limiting part cooperate; Figure 9 yes Figure 8 Enlarged cross-sectional view; In the diagram: 1. Lower mold; 11. Groove; 12. Casting receiving groove; 13. Limiting cone; 14. Guide groove; 2. Upper mold; 21. Punch; 22. Pressure plate; 23. Pressure block; 24. Guide protrusion; 3. Heating track; 31. Material storage track; 32. Material discharge track; 4. Heating section; 41. Second limiting groove; 42. Heating wire; 5. Limiting section; 51. Guide rail; 52. First limiting groove; 6. Vibratory feeder; 7. Finished product; 71. Cutting edge; 8. Blank; 81. Tool holder; 82. Blade; 83. Positioning post; 9. Robot arm. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Example 1

[0034] like Figure 1-9 As shown, the branch shears blade forming process of this embodiment includes the following steps: S100, Sheet material preparation; S200, Cutting and blanking: Cut the whole sheet of board into blanks 8; S300, Folding: Fold the blank 8 times, and the folded edge becomes the positioning part; S400, Red-hot; S500, Milling and Flanging: Removes excess material from the semi-finished product after hot stamping by flanging and folding; S600, Milling Chamfer: Processing a chamfer onto a semi-finished product; S700, deburring; S800, heat treatment: to improve product hardness; S900, surface treatment; The S400 hot forging step includes: S410, heating the cutting edge 82 of the blank 8; S420, forging the heated cutting edge 82 to form a plastic cutting edge; S430, allowing the semi-finished product to cool naturally to improve the product's toughness.

[0035] According to one embodiment of the present invention, a further step is provided between step S200 and step S300: S210, Drilling: Remove the wire ends at the cutting joint points on the blank 8; S220, double-sided grinding: removes the welding slag and burrs cut from the product, and at the same time grinds the blank 8 thin to ensure the material allowance for subsequent hot stamping. S230, Demagnetization: Use a demagnetizer to remove the magnetism generated by grinding on the blank 8.

[0036] According to one embodiment of the present invention, a step is provided between step S500 and step S600: S510, manual deburring: using a polishing machine to manually remove the remaining residual burrs and grind out the cutting edge.

[0037] According to one embodiment of the present invention, step S900 includes the following steps: S910, surface finishing: removing the oxide layer generated on the surface of the product due to heat treatment and finishing the cutting edge; S920, Oiling: Apply oil to the product surface to prevent rust.

[0038] The above steps can be specifically described as follows: Laser blanking: using a laser cutting machine to cut the entire board into product blanks; Drilling: Use a drilling machine to remove the thread ends at the laser cutting joints on the product blank; Double-sided grinding: A double-sided grinder is used to remove the welding slag and burrs from the laser cutting on the product, while grinding the product blank to a specified thickness to ensure the material allowance for subsequent hot stamping. Demagnetization: Using a demagnetizer to remove the magnetism generated on the product due to grinding; Polishing and deburring: Use a vibratory grinder to mix the product and abrasive materials and vibrate to grind and remove burrs from the product; Folding: Fold the edge of the blank; the folded edge becomes the positioning part. Hot stamping: The product is placed in an electromagnetic heating coil and heated to a specified temperature before being stamped in a mold. Heating softens the material, making it easier to shape. Natural cooling after hot stamping improves the product's toughness. Milling and flanging: Using a milling machine to remove the excess material from the hot stamped product by flanging and folding (most of it is removed, but some residue remains); Manual deburring: Use a polishing machine to manually remove any remaining burrs and grind out the cutting edge; Milling chamfers: The product is precisely positioned on the tooling, and the chamfers on the product are machined using a milling machine; Hand-polished areas: Use a grinder to manually remove any remaining burrs from the chamfered areas; Heat treatment: Outsourced processing, using heat treatment processes to improve product hardness; Surface finishing: Removes the oxide layer on the product surface caused by heat treatment and refines the cutting edge; Oiling: Apply oil to the product surface to prevent rust; According to one embodiment of the present invention, step S410 is implemented by a heating transmission assembly, which includes a heating track 3 disposed between the folding die and the hot stamping die, and a conveying assembly for conveying the blank 8 in the heating track 3. The heating track 3 includes a limiting part 5 and a heating part 4 that are configured to cooperate with each other. The shank 81 of the blank 8 is disposed in the limiting part 5, and the blade 82 of the blank 8 is disposed in the heating part 4.

[0039] This design ensures that the tool holder 81 is heated less, reducing the impact of subsequent die forging in the hot stamping die on the tool holder 81.

[0040] According to one embodiment of the present invention, the conveying assembly includes a vibratory feeder 6, the heating track 3 is arranged in a spiral shape, and the heating part 4 and the limiting part 5 are arranged in inner and outer rings.

[0041] This design achieves the goal of heating the blade 82 while feeding the material.

[0042] According to one embodiment of the present invention, the positioning element is a positioning post 83, and at least two positioning posts 83 are radially offset on the heating track 3; the limiting part 5 is provided with a guide rail 51 that limits and cooperates with the positioning post 83.

[0043] This design prevents the blank from shifting during vibratory feeding.

[0044] According to one embodiment of the present invention, the limiting part 5 is provided with a first limiting groove 52 for accommodating the handle 81, and the heating part 4 is provided with a second limiting groove 41 for accommodating the blade 82. The first limiting groove 52 and the second limiting groove 41 cooperate to heat and transfer the blank 8.

[0045] According to one embodiment of the present invention, a plurality of heating wires 42 are provided in the side wall of the second limiting groove 41, the heating part 4 is heat-conducting, and the limiting part 5 is heat-insulating.

[0046] This design further ensures that the heating effect of the heating unit 4 on the tool holder is reduced.

[0047] According to one embodiment of the present invention, a storage track 31 is provided at the outlet of the heating track 3, and a discharge track 32 is provided at the inlet of the heating track 3; it also includes a robot 9, which is used to place the folded blank 8 on the discharge track 32 and to pick up the blank 8 on the storage track 31 and place it in the hot stamping die.

[0048] This design enables automation and improves transmission efficiency.

[0049] Example 2

[0050] Example 2 is based on Example 1, except that step S420 is implemented by a hot stamping die, including: a fixed lower die 1 and a lifting upper die 2. The lower die 1 is provided with a groove 11 for placing the blank completed in step S300, and the upper die 2 is provided with a punch 21 for stamping the cutting edge of the blank. A casting receiving groove 12 is provided on the side of the groove 11 adjacent to the cutting edge.

[0051] With this design, the mold closing will compress the heated blade to increase its density. When it is compressed to a certain thickness, the required mold closing pressure is too high, which can easily damage the mold. Therefore, the casting receiving groove 12 can play a certain protective role for the mold.

[0052] According to one embodiment of the present invention, the tool holder 81 is provided with a ring for easy assembly, and the groove 11 is provided with a limiting cone 13 that limits and cooperates with the ring.

[0053] This design achieves the purpose of positioning the blank; the groove 11 is also provided with a recessed groove that cooperates with the positioning post 83.

[0054] According to one embodiment of the present invention, the groove 11 is provided with a limiting wall that limits and cooperates with the side wall of the handle 81.

[0055] This design further limits the position of the blank.

[0056] According to one embodiment of the present invention, the upper mold 2 is provided with a pressure plate 22 for lifting, and the punch 21 is inserted into the pressure plate 22. The punch 21 has two working positions. In the first working position, when the mold is opened, the pressure plate 22 descends relative to the punch 21, and the bottom end of the punch 21 is not lower than the bottom end of the pressure plate 22. In the second working position, when the mold is closed, the pressure plate 22 rises relative to the punch 21, and the bottom end of the punch 21 is lower than the bottom end of the pressure plate 22. The punch 21 is forged and pressed against the cutting edge of the semi-finished product. According to one embodiment of the present invention, a pressure block 23 is fixedly provided on the pressure plate 22. The pressure block 23 cooperates with the bottom of the groove 11 to fix the semi-finished product in the groove 11.

[0057] With this design, the pressure block 23 limits and fixes the knife handle, and the punch 21 forges the blade edge into the shape of the cutting edge, increasing the cutting edge density and thus improving the strength.

[0058] According to one embodiment of the present invention, the pressure block 23 is provided with an inner concave hole for accommodating the limiting cone 13.

[0059] With this design, the limiting cone 13 interferes with the mold closing.

[0060] According to one embodiment of the present invention, the lower mold 1 is provided with a guide groove 14, and the upper mold 2 is provided with a guide protrusion 24 that slides with the guide groove 14.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A process for forming the blade of tree branch shears, characterized in that, Includes the following steps: S100, Sheet material preparation; S200, Cutting and blanking: Cut the whole sheet into blanks (8); S300, Folding: Fold the blank (8) to make it a positioning part; S400, Red-hot; S500, Milling and Flanging: Removes excess material from the semi-finished product after hot stamping by flanging and folding; S600, Milling Chamfer: Processing a chamfer onto a semi-finished product; S700, deburring; S800, heat treatment: to improve product hardness; S900, surface treatment; The S400 hot forging step includes: S410, heating the blade (82) of the blank (8); S420, forging the heated blade (82) to form a plastic cutting edge; S430, allowing the semi-finished product to cool naturally to improve the product's toughness; Step S410 is achieved by a heating transmission assembly, which includes a heating track (3) set between the folding mold and the hot stamping mold, and a conveying assembly for conveying the blank (8) in the heating track (3). The heating track (3) includes a limiting part (5) and a heating part (4) that are configured to cooperate with each other. The shank (81) of the blank (8) is set in the limiting part (5), and the blade (82) of the blank (8) is set in the heating part (4). The conveying assembly includes a vibratory feeder (6), the heating track (3) is spirally arranged, and the heating part (4) and the limiting part (5) are arranged as inner and outer rings; The positioning element is a positioning post (83), and at least two positioning posts (83) are offset in the radial direction of the heating rail (3); the limiting part (5) is provided with a guide rail (51) that limits and cooperates with the positioning post (83).

2. The branch shears blade forming process according to claim 1, characterized in that, There is also a step between step S200 and step S300: S210, Drilling: Remove the wire ends at the cutting joints on the blank (8); S220, double-sided grinding: remove the welding slag and burrs cut on the product, and at the same time grind the blank (8) thin to ensure the material allowance for subsequent hot stamping; S230, Demagnetization: Use a demagnetizer to remove the magnetism generated by grinding on the blank (8).

3. The branch shears blade forming process according to claim 1, characterized in that, Between step S500 and step S600, there is another step: S510, manual deburring: use a grinder to manually remove the remaining residual burrs and grind out the cutting edge.

4. The branch shears blade forming process according to claim 1, characterized in that, Step S900 includes the following steps: S910, surface finishing: removing the oxide layer generated on the product surface due to heat treatment and finishing the cutting edge; S920, Oiling: Apply oil to the product surface to prevent rust.

5. The branch shears blade forming process according to claim 1, characterized in that, The limiting part (5) is provided with a first limiting groove (52) for accommodating the handle (81), and the heating part (4) is provided with a second limiting groove (41) for accommodating the blade (82). The first limiting groove (52) and the second limiting groove (41) cooperate to heat and transfer the blank (8).

6. The branch shears blade forming process according to claim 5, characterized in that, A plurality of heating wires (42) are provided in the side wall of the second limiting groove (41), the heating part (4) is heat-conducting, and the limiting part (5) is heat-insulating.

7. The branch shears blade forming process according to claim 6, characterized in that, The heating track (3) is provided with a storage track (31) at the outlet and a discharge track (32) at the inlet of the heating track (3); it also includes a robot (9), which is used to place the folded blank (8) on the discharge track (32) and to pick up the blank (8) on the storage track (31) and place it in the hot stamping die.

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