Manufacturing method of bow-shaped rake

Abstract

The invention relates to the technical field of production processes of agricultural and gardening tools, in particular to a manufacturing method of an arched rake. The method comprises the following steps: S1, presetting a steel plate with the same thickness as rake teeth, and performing cold blanking on the steel plate for several times to form two opposite arch-shaped rake blanks; s2, the arch-shaped rake blank is heated to the initial forging temperature; s3, a hydraulic forging table is prepared, a harrow beam of the harrow blank is fixed through the hydraulic forging table, then the harrow beam is bent forwards after the harrow beam and harrow teeth are separated, and then the harrow beam is forged to be straight through the hydraulic forging table; s4, a rake beam rounding die is prepared, and the left rake beam and the right rake beam are forged into circles at the same time; s5, the rake beam is bent upwards by 90 degrees through a bending tool; and S6, finally, forming and bending integrated equipment is used for bending the rake blank into the final shape. A steel plate is efficiently punched into two opposite arch-shaped harrow blanks through punching, efficiency is improved, the harrow beam rounding die forges and forms a left harrow beam and a right harrow beam at the same time, forging efficiency is further improved, and finally the harrow blanks are bent into the final shape through the forming and bending integrated equipment.

Description

Technical Field

[0001] The invention relates to the technical field of production technology of agricultural and garden tools, in particular to a method for manufacturing a bow-shaped rake. Background Art

[0002] The bow rake is a multifunctional and multi-specification agricultural tool widely used in farmland cultivation. The traditional bow rake needs to be heated and forged multiple times during molding, which is time-consuming and complicated. The cost is high and the working environment is not friendly. Public document 202111681664.5 discloses an integrated rake for batch production, including a rake body, a plurality of rake teeth provided on the rake body, and two rake wings provided on the rake body, including a rake body cut by a laser cutting process, a plurality of rake teeth provided on the rake body, and two rake wings provided on the rake body; in the above-mentioned public document, the blank is cut by a laser cutting process, which not only has low cutting efficiency and high cost, but also uses roll forging technology to roll the rake wings in step S4 into a circle, and can only roll forge the rake wings on one side separately, and the steps are relatively cumbersome.

[0003] In addition, our company's public document 202123285948.0 discloses a bow-shaped rake forming and bending integrated equipment, including a punching table and a punching machine, and a mold table is arranged on the punching table; a bending baffle is arranged on the top surface of the mold table, and the outer side surface of the bending baffle is a bow-shaped arc surface; a forming block is arranged on the top surface of the mold table, and the gap between the forming block and the bending baffle forms a rake piece fixing groove, and the outer side surface of the forming block close to the bending baffle is an arc surface with a predetermined curvature; the bottom surface of the punch includes an arc surface segment and a flat surface; on the top surface of the mold table, rotating bending blocks are respectively hinged on the left and right sides of the bending baffle, and a driving mechanism is arranged inside the mold table, and the inner side surfaces of the rotating bending blocks on the left and right sides closed with the bending baffle are respectively adapted to the shapes of the left half of the outer side surface and the right half of the outer side surface of the bending baffle. The structure of the above-mentioned public document can realize one-time forming of the bow-shaped rake and improve production efficiency. Summary of the invention

[0004] The present invention aims to solve the above problems, thereby providing a more efficient method for manufacturing a bow rake.

[0005] The present invention solves the above-mentioned problem by adopting the following technical solution: A method for manufacturing a bow-shaped rake comprises the following steps: S1: A steel plate of the same thickness as the rake teeth is preset, and the steel plate is cold-punched in batches to form two opposite bow-shaped rake blanks.

[0006] S2: Heat the bow-shaped rake blank to the initial forging temperature.

[0007] S3: Prepare a hydraulic forging table, use the hydraulic forging table to fix the rake beam of the rake blank, then separate the rake beam and the rake teeth to bend the rake beam forward, and then use the straightening hydraulic forging table to forge the rake beam straight.

[0008] S4: Prepare the rake beam rounding die, and forge the left and right rake beams into a round shape at the same time.

[0009] S5: Use the bending tool to bend the rake beam upwards 90°.

[0010] S6: Finally, the rake blank is bent into the final shape using a forming and bending integrated device.

[0011] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: Through cold punching, the steel plate is punched into two opposite arched rake blanks efficiently. Compared with laser cutting, it reduces costs and improves efficiency. Compared with punching after heating, it does not require multiple heating and saves energy consumption. The rake beam and rake teeth are separated by hydraulic forging table in combination with manual work, and then the rake beam is forged straight by hydraulic forging table. The rake beam rounding die is used to forge the left and right rake beams at the same time. Compared with roll forging or only pressing one side up and down, it further speeds up the forging efficiency and improves the quality of the finished product. Finally, the rake blank is bent into the final shape by the forming and bending integrated equipment.

[0012] Preferably, a further technical solution of the present invention is: Furthermore, in S1, the steel plate is first cut into a parallelogram-shaped blank by a shearing machine, and then separation holes for the rake beam and the rake teeth are cold punched out at the four corners inside the blank, and then the corners of the blank at the obtuse angle are cold cut, and separation gaps between the rake beams are cold cut at the top and bottom edges of the blank and close to the adjacent cutting positions, and then the rake teeth and rake beams on one side are cut together to form a rake blank, and then the rake blank on the opposite side is cold punched out.

[0013] Furthermore, the hydraulic forging table includes a fixed table, a groove-shaped upper table plate is buckled on the top of the fixed table, a lower anvil plate is fixed in the middle of the top surface of the upper table plate, a through hole is opened on the top of the fixed table and below the lower anvil plate, a first hydraulic cylinder is fixed on the bottom of the fixed table and below the through hole, the output end of the first hydraulic cylinder is upward and passes through the through hole, a rectangular movable hole is opened on the upper table and on one side of the lower anvil plate, a barbed shaping chuck is movably inserted in the movable hole, the top of the shaping chuck is opposite to the lower anvil plate and is opened with a shaping groove, the bottom end of the shaping chuck and one side close to the through hole is provided with a fixing sleeve mounted on the output end of the first hydraulic cylinder, and a foot switch electrically connected to the hydraulic cylinder is provided at the bottom of the fixed table.

[0014] Furthermore, in S3, the shaping groove is first stuck in the separation hole and rests against the lower anvil by the downward movement of the shaping chuck, and then one side of the rake beam is separated from the rake teeth, and then the shaping chuck is controlled to loosen the rake blank, and after the rake blank is rotated 90°, the rake beam on one side is straightened by the up and down movement of the shaping chuck, and the same is true for the rake beam on the other side.

[0015] Furthermore, the rake beam circular mold includes two groups of lower mold bases and upper mold bases, a placement groove is provided on the top of the lower mold base, a pair of L-shaped and back-facing forming molds are provided in the placement groove, semicircular forming grooves are respectively provided on the upper parts of the opposite sides of the forming molds, several groups of spring grooves are relatively provided between the middle parts of the opposite sides of the forming molds, and reset springs are provided between the opposite spring grooves, T-shaped sliding grooves are respectively provided on both sides of the bottom of the forming molds, a slider slidably connected to the sliding groove is provided in the placement groove of the lower mold base, the side opposite to the forming mold is an inclined pressure surface, and the upper mold base is opposite to the placement groove and an extrusion groove for extruding the inclined pressure surface of the forming mold is provided in the middle part of the bottom surface.

[0016] Furthermore, the two rake beams are respectively placed between the forming grooves in the two lower die seats, and the upper die seat uses the extrusion groove to extrude the inclined pressure surfaces of the two forming dies, driving the two forming dies to move relative to each other, and then the rectangular cross-section rake beam placed in the forming groove becomes a circular cross-section, and then the upper die seat is opened, and the two forming dies are reset by the reset spring.

[0017] Furthermore, the forming and bending integrated equipment includes a punching platform, a punching machine fixedly connected to one side of the punching platform through a vertical beam is arranged above the punching platform, a mold table with a box-type structure is arranged on the punching platform, and the top surface of the mold table forms a predetermined angle with the vertical beam; a bending baffle is arranged on the top surface of the mold table and below the punch head of the punching machine, and the outer side surface of the bending baffle is an arched arc surface; a forming block is arranged on the top surface of the mold table at a predetermined distance from the inner side surface of the bending baffle, and the gap between the forming block and the bending baffle forms a rake blank fixing groove for placing the rake blank, and the forming block is close to the bending baffle The outer side surface is an arc surface with a predetermined curvature; the bottom surface of the punch includes an arc surface segment adapted to the outer side surface of the forming block and a flat surface adapted to the top surface of the bending baffle; a rotating bending block is hinged on the left and right sides of the bending baffle on the top surface of the mold table, and a driving mechanism is arranged inside the mold table and below the rotating bending block, and the driving mechanism is used to drive the rotating bending block to rotate and close toward the outer side surface of the bending baffle, and the inner side surfaces of the rotating bending blocks on the left and right sides that are closed with the bending baffle are adapted to the shapes of the left half and right half outer side surfaces of the bending baffle respectively.

[0018] Furthermore, the driving mechanism includes a second hydraulic cylinder hinged on one side of the mold table, and arc-shaped slide grooves are respectively opened on both sides of the top surface of the mold table. A connecting rod is arranged in the arc-shaped slide groove, which passes through the middle of the relative rotating bending block and is hinged to the output end of the adjacent second hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the parallelogram structure of the blank in an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the blank after cutting according to the embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of blanking on a blank by a single-side rake according to an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure after the single-side rake blank blanking is completed in the embodiment of the present invention; Figure 5 This is a schematic diagram of the main structure of a hydraulic forging table according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the side structure of the hydraulic forging table according to an embodiment of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of a circular mold for a liquid rake beam according to an embodiment of the present invention; Figure 8 Schematic diagram of the exploded structure of the round mold for the liquid rake beam according to the embodiment of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the forming and bending integrated device according to an embodiment of the present invention; Fig.10 It is a schematic diagram of a top cross-sectional structure of a driving mechanism of a forming and bending integrated device according to an embodiment of the present invention; Fig.11 A schematic diagram of the punch structure of the integrated forming and bending device according to an embodiment of the present invention; Fig.12 This is a schematic diagram of the structure of the rake beam of the rake blank after being bent upward by 90° in an embodiment of the present invention; Fig.13 It is a schematic diagram of the structure of the rake blank punch after punching is completed in the embodiment of the present invention; Fig.14 It is a schematic diagram of the structure of the bending baffle of the rake blank after extrusion is completed in the embodiment of the present invention; Marked in the figure are: fixed table 1, upper table plate 2, lower anvil plate 3, first hydraulic cylinder 4, shaping chuck 5, shaping groove 51, fixed sleeve 6, lower die base 7, upper die base 8, extrusion groove 81, forming die 9, forming groove 91, slide groove 92, return spring 10, slider 11, punching table 12, punching machine 13, die table 14, bending baffle 15, forming block 16, rotating bending block 17, second hydraulic cylinder 18, connecting rod 19, arc slide groove 20, blank 21, separation hole 22, separation notch 23, rake blank 24, punch 25. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0021] A method for manufacturing a bow-shaped rake comprises the following steps: S1: Preset the steel plate with the same thickness as the rake teeth, and cold-punch the steel plate in batches to form two opposite arch-shaped rake blanks 24. The daily output of a single laser cutting machine is about 800 pieces, while the blanking process, under the same conditions, the daily output is increased by about three times, which can greatly improve the processing efficiency. First, use a shearing machine to cut the steel plate into parallelogram blanks 21 such as Figure 1 Then, the separation holes 22 for the rake beams and the rake teeth are respectively cold punched out at the four corners inside the blank 21, and then the corners of the blank 21 at the obtuse angle are cold cut, and the separation gaps 23 between the rake beams are cold cut at the top and bottom edges of the blank 21 and near the adjacent cutting positions. Figure 2 , and then the rake teeth and rake beams on one side are cut off together to form a rake blank 24 such as Figure 3 Then, the rake blank 24 on the opposite side is cold-punched. Figure 4 .

[0022] S2: heating the bow-shaped rake blank 24 to the initial forging temperature.

[0023] S3: Prepare a hydraulic forging table, use the hydraulic forging table to fix the rake beam of the rake blank 24, then bend the rake beam forward after breaking the rake beam and the rake teeth apart, and then use the straightening hydraulic forging table to straighten the rake beam. The rake beam is first broken apart and then straightened by the hydraulic forging table, such as Figure 5-6 The hydraulic forging table includes a fixed table 1, a groove-shaped upper table plate 2 is buckled on the top of the fixed table 1, a lower anvil plate 3 is fixed in the middle of the top surface of the upper table plate 2, a through hole is opened on the top of the fixed table 1 and below the lower anvil plate 3, a first hydraulic cylinder 4 is fixed on the bottom of the fixed table 1 and below the through hole, the output end of the first hydraulic cylinder 4 is upward and passes through the through hole, a rectangular movable hole is opened on the upper table plate 2 and on one side of the lower anvil plate 3, a barbed shaping chuck 5 is movably inserted in the movable hole, the middle shape of the shaping chuck 5 is adapted to the movable hole, the top of the shaping chuck 5 is opposite to the lower anvil plate 3 and is opened with a shaping groove 51, the bottom end of the shaping chuck 5 and the side close to the through hole are provided with a fixing sleeve 6 mounted on the output end of the first hydraulic cylinder 4, and a foot switch electrically connected to the first hydraulic cylinder 4 is provided at the bottom of the fixed table 1. First, the shaping groove 51 is stuck in the separation hole 22 and rests on the lower anvil 3 through the downward movement of the shaping chuck 5, and then one side of the rake beam is separated from the rake teeth. Then, the shaping chuck 5 is controlled to loosen the rake blank 24. After the rake blank 24 is rotated 90°, the rake beam on one side is straightened through the up and down movement of the shaping chuck 5, and the rake beam on the other side is straightened in the same way. The processing efficiency is improved through mechanical forging, and the labor intensity of workers is reduced.

[0024] S4: Prepare the rake beam rounding die, and forge the left and right rake beams into round shapes at the same time. Figure 7-8The rake beam circular mold includes two groups of lower mold bases 7 and upper mold bases 8. A placement groove is provided on the top of the lower mold base 7, and a pair of L-shaped and back-facing forming molds 9 are provided in the placement groove. Semicircular forming grooves 91 are respectively provided in the upper parts of the opposite sides of the forming molds 9, and several groups of spring grooves are relatively provided between the middle parts of the opposite sides of the forming molds 9. A reset spring 10 is provided between the opposite spring grooves. T-shaped slide grooves 92 are respectively provided on both sides of the bottom of the forming mold 9. A slider 11 slidably connected to the slide groove 92 is provided in the placement groove of the lower mold base 7. The side opposite to the forming mold 9 is an inclined pressure surface. The upper mold base 8 is opposite to the placement groove and an extrusion groove 81 for extruding the inclined pressure surface of the forming mold 9 is provided in the middle of the bottom surface. The extrusion groove 81 is trapezoidal. The two rake beams are respectively placed between the forming grooves 91 in the two lower die seats 7, and the upper die seat 8 moves downward to cause the extrusion groove 81 to extrude the inclined pressure surfaces of the two forming dies 9, driving the two forming dies 9 to move relative to each other, and then the rectangular cross-section rake beam placed in the forming groove 91 becomes a circular cross-section, and then the upper die seat 8 is opened, and the two forming dies 9 are reset by the reset spring 10, so that the left and right rake beams can be forged into a circle at the same time, which not only avoids the process of repeated roller forging into a circle, but also the simultaneous construction of the left and right rake beams increases the processing efficiency by at least twice, while reducing the labor intensity of workers.

[0025] S5: Use the bending tool to bend the rake beam upwards 90°. Fig.12 .

[0026] S6: Finally, the rake blank 24 is bent into the final shape by a forming and bending integrated device. Figure 9-11The forming and bending integrated equipment comprises a punching platform 12, above which is arranged a punching machine 13 fixedly connected to one side of the punching platform 12 through a vertical beam, and a mold table 14 of a box-type structure is arranged on the punching platform 12, the mold table 14 is a box-type structure with a right-angle trapezoidal cross section, and the top surface of the mold table 14 forms a predetermined angle with the vertical beam; a bending baffle 15 is arranged on the top surface of the mold table 14 below the punch 25 of the punching machine 13, and the outer side surface of the bending baffle 15 is an arched arc surface; a forming block 16 is arranged on the top surface of the mold table 14 at a predetermined distance from the inner side surface of the bending baffle 15, and the gap between the forming block 16 and the bending baffle 15 forms a fixed groove for a rake blank 24 for placing the rake blank 24, and the forming block 16 is close to the bending The outer side surface of the baffle 15 is an arc surface with a predetermined curvature; the bottom surface of the punch 25 includes an arc surface segment adapted to the outer side surface of the forming baffle 16 and a flat surface adapted to the top surface of the bending baffle 15; on the top surface of the mold table 14, rotating bending blocks 17 are respectively hinged on the left and right sides of the bending baffle 15, and the rotating bending blocks 17 are symmetrically arranged about the center line of the bending baffle 15. A driving mechanism is respectively arranged inside the mold table 14 and below the rotating bending blocks 17. The driving mechanism is used to drive the rotating bending blocks 17 to rotate and close toward the outer side surface of the bending baffle 15. The inner side surfaces of the rotating bending blocks 17 on the left and right sides that are closed with the bending baffle 15 are respectively adapted to the shapes of the left half outer side surface and the right half outer side surface of the bending baffle 15. The driving mechanism includes a second hydraulic cylinder 18 hinged on one side of the mold table 14. The top surface of the mold table 14 is provided with arc-shaped grooves 20 on both sides. A connecting rod 19 is arranged in the arc-shaped groove 20. The connecting rod 19 passes through the middle of the relative rotating bending block 17 and is hinged with the output end of the adjacent second hydraulic cylinder 18. In the initial state, the inner side surfaces of the rotating bending blocks 17 on the left and right sides are flush with the bottom edge of the outer side surface of the forming block 16. When forming and bending, the rake teeth of the rake blank 24 are stuck in the fixed groove of the rake blank 24, and the rake beam is against the inner side surface of the rotating bending block 17; then the punch 25 punches and completes the rake tooth forming as shown in FIG. Fig.13 The second hydraulic cylinder 18 drives the rotating bending block 17 to rotate along the arc-shaped slide 20 toward the bending baffle 15 to complete the rake beam forming. Fig.14 .

[0027] By punching out, the steel plate is efficiently punched into two opposite bow-shaped rake blanks 24, which improves the efficiency. There is no need to heat it multiple times. The rake beam and the rake teeth are separated manually using a hydraulic forging table, and then the rake beam is forged straight by the hydraulic forging table. The rake beam rounding mold is used to forge the left and right rake beams at the same time, which further speeds up the forging efficiency. Finally, the rake blank 24 is bent into the final shape by the integrated forming and bending equipment. The manufacturing method of the present application greatly improves the production efficiency and reduces the labor intensity of workers.

[0028] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A method for manufacturing a bow-shaped rake, characterized in that: The steps include: S1: A steel plate with the same thickness as the rake teeth is preset, and the steel plate is cold-punched in batches to form two opposite arch-shaped rake blanks; S2: heating the bow-shaped rake blank to the initial forging temperature; S3: prepare a hydraulic forging table, use the hydraulic forging table to fix the rake beam of the rake blank, then separate the rake beam and the rake teeth to bend the rake beam forward, and then use the straightening hydraulic forging table to forge the rake beam straight; S4: prepare a rake beam rounding die, and forge the left and right rake beams into a round shape at the same time; S5: Use a bending tool to bend the rake beam upwards 90°; S6: Finally, the rake blank is bent into the final shape using a forming and bending integrated device.

2. The method for manufacturing a bow-shaped rake according to claim 1, characterized in that: In S1, a shearing machine is first used to cut the steel plate into a parallelogram-shaped blank. Then, separation holes for the rake beam and the rake teeth are cold punched out at the four corners inside the blank. Then, the corners at the obtuse angle of the blank are cold cut. Separation gaps between the rake beams are cold cut at the top and bottom edges of the blank and close to the adjacent cutting positions. Then, the rake teeth and the rake beam on one side are cut together to form a rake blank. Then, the rake blank on the opposite side is cold punched out.

3. The method for manufacturing a bow-shaped rake according to claim 2, characterized in that: The hydraulic forging table includes a fixed table, a groove-shaped upper table plate is buckled on the top of the fixed table, a lower anvil plate is fixed in the middle of the top surface of the upper table plate, a through hole is opened on the top of the fixed table and below the lower anvil plate, a first hydraulic cylinder is fixed on the bottom of the fixed table and below the through hole, the output end of the first hydraulic cylinder is upward and passes through the through hole, a rectangular movable hole is opened on the upper table and on one side of the lower anvil plate, a barbed shaping chuck is movably inserted in the movable hole, the top of the shaping chuck is opposite to the lower anvil plate and is opened with a shaping groove, the bottom end of the shaping chuck and the side close to the through hole are provided with a fixing sleeve mounted on the output end of the first hydraulic cylinder, and a foot switch electrically connected to the hydraulic cylinder is provided at the bottom of the fixed table.

4. The method for manufacturing a bow-shaped rake according to claim 3, characterized in that: In S3, the shaping groove is firstly stuck in the separation hole and pressed against the lower anvil plate by the downward movement of the shaping chuck, and then one side of the rake beam is separated from the rake teeth, and then the shaping chuck is controlled to loosen the rake blank, and after the rake blank is rotated 90°, the shaping chuck is used to straighten the rake beam on one side by the up and down movement of the shaping chuck, and the same is true for the rake beam on the other side.

5. The method for manufacturing a bow-shaped rake according to claim 1, characterized in that: The rake beam circular mold includes two groups of lower mold bases and upper mold bases. A placement groove is arranged on the top of the lower mold base, and a pair of L-shaped and back-facing forming molds are arranged in the placement groove. Semicircular forming grooves are respectively opened in the upper parts of the opposite sides of the forming molds, and several groups of spring grooves are relatively arranged between the middle parts of the opposite sides of the forming molds. Reset springs are arranged between the opposite spring grooves, and T-shaped sliding grooves are respectively opened on both sides of the bottom of the forming mold. A slider slidably connected to the sliding groove is arranged in the placement groove of the lower mold base, and the side opposite to the forming mold is an inclined pressure surface. The upper mold base is opposite to the placement groove and an extrusion groove for extruding the inclined pressure surface of the forming mold is opened in the middle of the bottom surface.

6. The method for manufacturing a bow-shaped rake according to claim 5, characterized in that: The two rake beams are placed between the forming grooves in the two lower die seats respectively. The upper die seat runs the extrusion groove to extrude the inclined pressure surfaces of the two forming dies, driving the two forming dies to move relative to each other. Then the rectangular cross-section rake beam placed in the forming groove becomes a circular cross-section. After that, the upper die seat is opened and the two forming dies are reset by the reset spring.

7. The method for manufacturing a bow-shaped rake according to claim 1, characterized in that: The forming and bending integrated equipment comprises a punching platform, a punching machine fixedly connected to one side of the punching platform through a vertical beam is arranged above the punching platform, a mold table of a box-type structure is arranged on the punching platform, and the top surface of the mold table forms a predetermined angle with the vertical beam; a bending baffle is arranged on the top surface of the mold table below the punch head of the punching machine, and the outer side surface of the bending baffle is an arched arc surface; a forming block is arranged on the top surface of the mold table at a predetermined distance from the inner side surface of the bending baffle, and the gap between the forming block and the bending baffle forms a rake blank fixing groove for placing the rake blank, and the forming block is close to the outer side of the bending baffle The surface is an arc surface with a predetermined arc; the bottom surface of the punch includes an arc surface segment matched with the outer side surface of the forming block and a flat surface matched with the top surface of the bending baffle; the top surface of the mold table is hinged with rotating bending blocks on the left and right sides of the bending baffle, and driving mechanisms are respectively arranged inside the mold table and below the rotating bending blocks. The driving mechanisms are used to drive the rotating bending blocks to rotate and close toward the outer side surface of the bending baffle, and the inner side surfaces of the rotating bending blocks on the left and right sides that are closed with the bending baffle are respectively matched with the shapes of the left half outer side surface and the right half outer side surface of the bending baffle.

8. The method for manufacturing a bow-shaped rake according to claim 7, characterized in that: The driving mechanism includes a second hydraulic cylinder hinged on one side of the mold table. Arc grooves are respectively provided on both sides of the top surface of the mold table. Connecting rods are arranged in the arc grooves. The connecting rods pass through the middle of the relative rotating bending blocks and are hinged to the output end of the adjacent second hydraulic cylinder.

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