Cold heading method for manufacturing wood milling cutter blank

Abstract

The invention relates to the technical field of manufacturing processes, and discloses a cold heading method for manufacturing a woodworking milling cutter blank. Shearing and cutting the die by a machine; the first punching die extrudes the steel wire to realize first-time strong beam deformation; the blank is overturned and translated to a second die cavity opening through the manipulator to realize shaping; the shaped blank is translated to a third die cavity through a mechanical arm, and the requirement for the size of a milling cutter handle is met; the milling cutter blank is translated to a fourth mold cavity through a manipulator, and a preformed structure of a product head form is obtained; the pre-forming structure is horizontally moved to a fifth mold cavity through the mechanical arm, and second-time pre-forming is carried out; the pre-forming structure is translated to a sixth die cavity through a mechanical arm, final extrusion forming is carried out in a stamping die cold extrusion mode, and the required size is obtained; and the formed blank is subjected to local normalizing heat treatment through high-frequency automatic heat treatment equipment so that the metal metallographic structure state of subsequent milling can be achieved. And according to the characteristics of the steel wires, extrusion is carried out step by step, and cost can be reduced while working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of manufacturing technology, specifically a method for cold heading of woodworking milling cutter blanks. Background Technology

[0002] When making wood milling cutters, a cutting machine is needed for final finishing to remove excess material before the ends are finished. This method not only wastes raw materials but also labor, making it time-consuming and labor-intensive.

[0003] Document CN 110405266 A discloses a form milling cutter and a method for machining fir tree-shaped arc tenons using the form milling cutter. The form milling cutter includes a cutter shank, cutting teeth, and a cutting insert support. The cutting insert support is mounted at one end of the cutter shank. From the end of the cutter shank towards the cutter tip, the cutting insert support has a reference step surface, a first step surface, and a second step surface sequentially arranged. Each of the reference step surface, the first step surface, and the second step surface has five cutting teeth. The five cutting teeth have identical structures, and the five cutting teeth in each layer are evenly spaced from the centerline of the cutter shank. The connecting line of the cutting edge profile of the cutting teeth matches the fir tree-shaped arc surface of the workpiece and is a spiral line. This method still requires milling at the end, which results in some material waste. However, this method reduces labor costs while still saving material.

[0004] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a method for cold heading of woodworking milling cutter blanks. Based on the deformation characteristics of steel wire, the blanks are extruded step by step, which improves work efficiency while reducing costs.

[0006] The technical solution of this invention is: a method for cold heading of woodworking milling cutter blanks, comprising the following steps: Step 1: Select steel wire, draw it twice, temper it in sequence, and then perform phosphate treatment on the billet that reaches the required size; Step 2: Place the coiled steel wire on one side of the machine, and then release the steel wire into the machine's shearing mechanism. The machine will cut the steel wire to the required length by adjusting the cutting die. Step 3: The steel wire is picked up by the robot and moved to the first mold cavity. The steel wire is squeezed by the first punch. The steel wire has an outward protrusion at the position of the first mold cavity. The connection between the protrusion and the cylindrical part of the blank is arc a, which realizes the first strong deformation. After the strong deformation is completed, the blank is pushed out by the ejector pin behind the first mold cavity, and then the robot clamps it. Step 4: The blank that has undergone strong bending deformation in Step 3 is flipped and translated to the second mold cavity opening by the robot arm. At this time, the protrusion is away from the second mold cavity opening, and the cylindrical part is inserted into the second mold cavity. Then, the blank is pushed by the second punch to make the arc a more gentle than the pushing in Step 3 to form the arc b, thus achieving shaping. The blank is pushed out by the ejector pin behind the second mold cavity opening, and then the robot arm clamps it. Step 5: The blank shaped in Step 4 is moved to the third mold cavity by the robot arm. The push tube is used to abut against the arc b of the blank in Step 4 for strong binding. The bottom of the cylinder of the blank at the end away from the protrusion extends outward from one-eighth to one-seventh of the position to obtain the size requirements of the milling cutter shank. The blank is pushed out by the ejector pin behind the opening of the third mold cavity, and then the robot arm clamps it. Step 6: The milling cutter blank from Step 5 is moved to the fourth mold cavity by the robot arm, and the cylindrical part is extruded by the fourth punch to obtain the pre-formed structure of the product head. The pre-formed structure is ejected by the ejector pin behind the opening of the fourth mold cavity, and then the robot arm clamps it. Step 7: The preformed structure from Step 6 is moved to the fifth mold cavity by a robot arm, and a second preform is performed by cold extrusion using the fifth die. The preformed structure is then ejected by the ejector pin behind the fourth mold cavity opening, and then the robot arm clamps it. Step 8: The preformed structure from Step 7 is transferred to the sixth mold cavity by a robot arm, and the preformed structure is cold extruded using the sixth die. The final extrusion molding is performed by the die cold extrusion method to obtain the required dimensions. Step 9: The formed billet is subjected to local normalizing heat treatment using high-frequency automated heat treatment equipment to achieve the metallographic structure required for subsequent milling by the customer.

[0007] Preferably, the calculation formula for the length of the steel wire in step 2, which is the length of the finished woodworking milling cutter, is as follows: Wire length = weight ÷ specific gravity ÷ diameter 2 .

[0008] Preferably, in step 3, a hollow cavity a is provided near the outside of the first mold cavity. The diameter of the hollow cavity a is smaller than the diameter of the blank, and the end of the steel wire abuts against the opening of the hollow cavity.

[0009] By adopting the above technical solution, during the first cold extrusion of the steel wire, the steel wire located on the hollow cavity a is squeezed into the hollow cavity to form the protrusion required by the product.

[0010] Preferably, the second mold cavity in step 4 is a cylindrical cavity that is adapted to the cylindrical part. The diameter of the cylindrical cavity is slightly larger than the diameter of the cylindrical part of the blank. The arc b is located outside the second mold cavity. The second punch has a hollow cavity b inside. The diameter of the hollow cavity b matches the protrusion. The hollow cavity b is fitted on the protrusion. The side of the second punch is a flat surface that is extruded onto the arc a.

[0011] By adopting the above technical solution, the arc shape a around the protrusion can be flattened, making the arc shape a more gentle, which makes it easier to gradually flatten the arc shape a into a straight shape in the later process.

[0012] Preferably, the third mold cavity in step 5 includes a hollow cavity c, and an extrusion mold cavity a is provided on one side of the hollow mold cavity c. The diameter of the extrusion mold cavity a is smaller than that of the hollow cavity c, and the bottom of the cylindrical part abuts against the outermost side of the extrusion mold cavity a.

[0013] Preferably, the diameter of the hollow part inside the push tube is adapted to the protrusion, the side of the push tube is flat and abuts against the arc b, and the protrusion of the blank is located inside the third mold cavity.

[0014] By adopting the above technical solution, the protrusion is attached to the push tube, and then the blank is squeezed into the third mold cavity. When the push tube squeezes the blank, the arc b is squeezed into a straight shape, and one side of the blank is squeezed into the shape of a milling cutter shank.

[0015] Preferably, the fourth die in step 6 is a hollow gourd shape, with the inner cavity of the gourd shape being larger than the cylindrical part. A hollow cavity d is provided on one side of the fourth die cavity, and the size of the hollow cavity d is adapted to the size of the milling cutter shank. The cylindrical part is snapped onto the outer edge of the hollow cavity d.

[0016] By adopting the above technical solution, when the gourd-shaped fourth die extrudes towards the blank, the cylindrical part of the blank is extruded into a gourd shape, which facilitates further cold extrusion molding in subsequent processes.

[0017] Preferably, in step 7, the fifth die has a mushroom-shaped cavity, and the fifth die cavity and the fourth die cavity have the same structure and the same snap-fit ​​position.

[0018] By adopting the above technical solution, gourd-shaped blanks are pressed into corresponding mushroom shapes.

[0019] Preferably, the sixth cavity in step 8 is an umbrella-shaped cavity, and the six cavities have the same structure and the same snap-fit ​​position.

[0020] By adopting the above technical solution, mushroom-shaped blanks are pressed into umbrella shapes.

[0021] The advantages of this invention are: 1. This invention gradually forms the required woodworking milling cutter by repeatedly cold extruding steel wire, eliminating the need for subsequent processing. It can be completed in a cold heading machine, thus improving the forming efficiency of the milling cutter.

[0022] 2. This invention eliminates the need for material cutting and shaping; the material can be formed in one step in a cold heading machine, effectively saving materials and labor. After the cold heading process, the milling cutter can be manufactured, saving company costs.

[0023] 3. This invention utilizes the deformation characteristics of steel wire to perform progressive extrusion, thereby improving work efficiency while reducing costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the steel wire of the present invention; Figure 2 This is a schematic diagram of the structure after extrusion in step 3 of the present invention; Figure 3 This is a schematic diagram of the mold structure for step 3 of the present invention; Figure 4 This is a schematic diagram of the structure after extrusion in step 4 of the present invention; Figure 5 This is a schematic diagram of the mold structure in step 4 of the present invention; Figure 6 This is a schematic diagram of the structure after extrusion in step 5 of the present invention; Figure 7 This is a schematic diagram of the mold structure in step 5 of the present invention; Figure 8 This is a schematic diagram of the structure after extrusion in step 6 of the present invention; Figure 9 This is a schematic diagram of the mold structure for step 6 of the present invention; Figure 10 This is a schematic diagram of the structure after extrusion in step 7 of the present invention; Figure 11 This is a schematic diagram of the mold structure for step 7 of the present invention; Figure 12 This is a schematic diagram of the structure after extrusion in step 8 of the present invention; Figure 13 This is a schematic diagram of the mold structure in step 8 of the present invention.

[0025] Among them: 1. steel wire, 11. protrusion, 12. cylindrical part, 13. arc a, 14. arc b, 15. straight, 16. milling cutter shank. 2. First mold cavity, 201. Hollow cavity a, 21. First punch, 3. Second mold cavity, 31. Second punch, 311. Hollow cavity b, 4. Third mold cavity, 401. Hollow cavity c, 402. Extrusion mold cavity a, 41. Third punch, 5. Fourth mold cavity, 501. Hollow cavity d, 51. Fourth punch, 6. Fifth mold cavity, 61. Fifth punch, 7. Sixth mold cavity, 71. Sixth punch. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0027] A method for cold heading of woodworking milling cutter blanks includes the following steps: Step 1: As Figure 1 As shown, steel wire 1 is selected and drawn twice, then tempered in sequence to reach the required size of the billet before phosphate treatment. Step 2: Place the coiled steel wire 1 on one side of the machine, and then release the steel wire 1 into the machine's shearing mechanism. The machine will cut the steel wire 1 to the required length by adjusting the cutting die. Step 3: As Figure 2-3 As shown, the steel wire 1 is picked up by the robot and moved to the opening of the first mold cavity 2. The steel wire 1 is squeezed by the first punch 21. The steel wire 1 has an outward protrusion 11 at the position of the opening of the first mold cavity 2. The connection between the protrusion 11 and the cylindrical part 12 of the blank is an arc a13, which realizes the first strong deformation. After the strong deformation is completed, the blank is ejected by the ejector pin behind the opening of the first mold cavity 2, and then the robot grips it. Step 4: As Figure 4-5 As shown, the blank that has undergone strong bending deformation in step 3 is flipped and translated to the opening of the second mold cavity 3 by a robot arm. At this time, the protrusion 11 is away from the opening of the second mold cavity 3, and the cylindrical part 12 is inserted into the second mold cavity 3. Then, the blank is pushed by the second punch 31, and the arc a13 is flatter than the pushing in step 3 to form the arc b14, thus achieving shaping. The blank is pushed out by the ejector pin behind the opening of the second mold cavity 3, and then the robot arm clamps it. Step 5: As Figure 6-7 As shown, the blank shaped in step 4 is translated to the third mold cavity 4 by a robot arm. The arc b14 of the blank in step 4 is strongly bound by the push tube. The bottom of the cylinder of the blank at the end away from the protrusion 11 extends outward from one-eighth to one-seventh of the position to obtain the size requirement of the milling cutter shank 16. The blank is pushed out by the ejector pin behind the opening of the third mold cavity 4, and then the robot arm clamps it. Step 6: As Figure 8-9As shown, the milling cutter blank in step 5 is translated to the fourth mold cavity 5 by the robot arm, and the cylindrical part 12 is extruded by the fourth punch 51 to obtain the pre-formed structure of the product head. The pre-formed structure is ejected by the ejector pin behind the opening of the fourth mold cavity 5, and then the robot arm clamps it. Step 7: As Figure 10-11 As shown, the preformed structure in step 6 is moved to the fifth mold cavity 6 by a robot arm, and a second preform is performed by cold extrusion using the fifth die 61. The preformed structure is ejected by the ejector pin behind the opening of the fourth mold cavity 5, and then the robot arm clamps it. Step 8: As Figure 12-13 As shown, the preformed structure in step 7 is transferred to the sixth mold cavity 7 by a robot arm, and the preformed structure is cold extruded by the sixth die 71. The final extrusion molding is carried out by the die cold extrusion method to obtain the required size. Step 9: The formed billet is subjected to local normalizing heat treatment using high-frequency automated heat treatment equipment to achieve the metallographic structure required for subsequent milling by the customer.

[0028] The formula for calculating the length of wire 1 in step 2, which is the length of the finished woodworking milling cutter, is as follows: Wire length = weight ÷ specific gravity ÷ diameter 2 .

[0029] In step 3, a hollow cavity a201 is provided near the outside of the first mold cavity 2. The diameter of the hollow cavity a201 is smaller than the diameter of the blank. The end of the steel wire 1 abuts against the opening of the hollow cavity. When the steel wire 1 is subjected to the first cold extrusion, the steel wire 1 located on the hollow cavity a201 is just squeezed into the hollow cavity to form the protrusion 11 required by the product.

[0030] In step 4, the second mold cavity 3 is a cylindrical cavity that fits the cylindrical part 12. The diameter of the cylindrical cavity is slightly larger than the diameter of the cylindrical part 12 of the blank. The arc b14 is located outside the second mold cavity 3. The second punch has a hollow cavity b311 inside. The diameter of the hollow cavity b311 matches the protrusion 11. The hollow cavity b311 is fitted on the protrusion 11. The side of the second punch is a flat surface that pushes the arc a13, which can flatten the arc a13 around the protrusion 11, making the arc a13 more gentle, which is convenient for the arc a13 to be gradually pressed into a straight shape 15 in the later process.

[0031] The third mold cavity 4 in step 5 includes a hollow cavity c401. A pushing mold cavity a402 is also provided on one side of the hollow mold cavity c401. The diameter of the pushing mold cavity a402 is smaller than that of the hollow cavity c401. The bottom of the cylindrical part 12 abuts against the outermost side of the pushing mold cavity a402. The diameter of the hollow part inside the push tube is adapted to the protrusion 11. The side of the push tube is flat and abuts against the arc b14. The protrusion 11 of the billet is located inside the opening of the third mold cavity 4. The protrusion 11 is engaged in the push tube. Then the billet is squeezed into the third mold cavity 4. When the push tube squeezes the billet, the arc b14 is squeezed into a straight shape 15, and at the same time, one side of the billet is squeezed into the shape of a milling cutter shank 16.

[0032] In step 6, the fourth die 51 is hollow and gourd-shaped, with the inner cavity of the gourd shape being larger than the cylindrical part 12. A hollow cavity d501 is provided on one side of the fourth die cavity 5. The size of the hollow cavity d501 is compatible with that of the milling cutter shank 16. The cylindrical part 12 is snapped onto the outer edge of the hollow cavity d501. When the gourd-shaped fourth die 51 is pressed toward the blank, the cylindrical part 12 of the blank is pressed into a gourd shape, which facilitates further cold extrusion forming in subsequent processes.

[0033] In step 7, the fifth die 61 has a mushroom-shaped cavity. The fifth die cavity 6 and the fourth die cavity 5 have the same structure and the same snap-fit ​​position, which presses the gourd-shaped blank into the corresponding mushroom shape.

[0034] In step 8, the sixth mold cavity 7 is an umbrella-shaped cavity. The sixth cavity has the same structure and the same snap-fit ​​position, which presses the mushroom-shaped blank into an umbrella shape.

[0035] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A method for cold heading a woodworking milling cutter blank, characterized in that, Includes the following steps: Step 1: Select steel wire, draw it twice, temper it in sequence, and then perform phosphate treatment on the billet that reaches the required size; Step 2: Place the coiled steel wire on one side of the machine, and then release the steel wire into the machine's shearing mechanism. The machine will cut the steel wire to the required length by adjusting the cutting die. Step 3: The steel wire is picked up by the robot and moved to the first mold cavity. The steel wire is squeezed by the first punch. The steel wire has an outward protrusion at the position of the first mold cavity. The connection between the protrusion and the cylindrical part of the blank is arc a, which realizes the first strong deformation. After the strong deformation is completed, the blank is pushed out by the ejector pin behind the first mold cavity, and then the robot clamps it. Step 4: The blank that has undergone strong bending deformation in Step 3 is flipped and translated to the second mold cavity opening by the robot arm. At this time, the protrusion is away from the second mold cavity opening, and the cylindrical part is inserted into the second mold cavity. Then, the blank is pushed by the second punch to make the arc a more gentle than the pushing in Step 3 to form the arc b, thus achieving shaping. The blank is pushed out by the ejector pin behind the second mold cavity opening, and then the robot arm clamps it. Step 5: The blank shaped in Step 4 is moved to the third mold cavity by the robot arm. The push tube is used to abut against the arc b of the blank in Step 4 for strong binding. The bottom of the cylinder of the blank at the end away from the protrusion extends outward from one-eighth to one-seventh of the position to obtain the size requirements of the milling cutter shank. The blank is pushed out by the ejector pin behind the opening of the third mold cavity, and then the robot arm clamps it. Step 6: The milling cutter blank from Step 5 is moved to the fourth mold cavity by the robot arm, and the cylindrical part is extruded by the fourth punch to obtain the pre-formed structure of the product head. The pre-formed structure is ejected by the ejector pin behind the opening of the fourth mold cavity, and then the robot arm clamps it. Step 7: The preformed structure from Step 6 is moved to the fifth mold cavity by a robot arm, and a second preform is performed by cold extrusion using the fifth die. The preformed structure is then ejected by the ejector pin behind the fourth mold cavity opening, and then the robot arm clamps it. Step 8: The preformed structure from Step 7 is transferred to the sixth mold cavity by a robot arm, and the preformed structure is cold extruded using the sixth die. The final extrusion molding is performed by the die cold extrusion method to obtain the required dimensions. Step 9: The formed billet is subjected to local normalizing heat treatment using high-frequency automated heat treatment equipment to achieve the metallographic structure required for subsequent milling by the customer.

2. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: The formula for calculating the length of the steel wire in step 2, which is the length of the finished woodworking milling cutter, is as follows: Wire length = weight ÷ specific gravity ÷ diameter 2 .

3. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: In step 3, a hollow cavity a is provided near the outside of the first mold cavity. The diameter of the hollow cavity a is smaller than the diameter of the blank, and the end of the steel wire abuts against the opening of the hollow cavity.

4. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: In step 4, the second mold cavity is a cylindrical cavity that fits the cylindrical part. The diameter of the cylindrical cavity is slightly larger than the diameter of the cylindrical part of the blank. The arc b is located outside the second mold cavity. The second punch has a hollow cavity b inside. The diameter of the hollow cavity b matches the protrusion. The hollow cavity b is fitted on the protrusion. The side of the second punch is a flat surface that is extruded onto the arc a.

5. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: The third mold cavity in step 5 includes a hollow cavity c, and an extrusion mold cavity a is provided on one side of the hollow mold cavity c. The diameter of the extrusion mold cavity a is smaller than that of the hollow cavity c, and the bottom of the cylindrical part abuts against the outermost side of the extrusion mold cavity a.

6. The method for cold heading of a woodworking milling cutter blank according to claim 5, characterized in that: The diameter of the hollow part of the push tube is adapted to the protrusion. The side of the push tube is flat and abuts against the arc b. The protrusion of the blank is located inside the third mold cavity.

7. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: The fourth die in step 6 is hollow gourd-shaped, with the inner cavity of the gourd shape being larger than the cylindrical part. A hollow cavity d is provided on one side of the fourth die cavity, and the size of the hollow cavity d is adapted to the size of the milling cutter shank. The cylindrical part is snapped onto the outer edge of the hollow cavity d.

8. The method for cold heading of a woodworking milling cutter blank according to claim 1, characterized in that: In step 7, the fifth die has a mushroom-shaped cavity. The fifth die cavity and the fourth die cavity have the same structure and the same snap-fit ​​position.

9. A method for cold heading a woodworking milling cutter blank according to claim 1, characterized in that: The sixth mold cavity in step 8 is an umbrella-shaped cavity. The sixth cavity and the sixth cavity have the same structure and the same snap-fit ​​position.

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