Hand-held hand tool for thin plate cutting and use method of hand-held hand tool

Abstract

The invention relates to the technical field of handheld manual tools, in particular to a handheld manual tool for sheet cutting, which comprises a cutter body, a lower cutter wheel assembly and an upper cutter wheel assembly, the lower cutter wheel assembly and the upper cutter wheel assembly are assembled on the cutter body in a rotatable mode, and the upper cutter wheel assembly and the lower cutter wheel assembly form a shear opening facilitating shearing by adjusting the relative positions of the lower cutter wheel assembly and the upper cutter wheel assembly in the radial direction. According to the cutter, the lever principle is applied to cutting of a thin plate object, the cutter body is manually pushed, the upper cutter wheel and the lower cutter wheel fixed to the bearing rotate, the rotating torque of the upper cutter wheel and the lower cutter wheel generates shear force on the cut position of the thin plate, and when the shear force acting on the cut position of the thin plate reaches the cut yield strength of the thin plate, the thin plate is cut. The thin plate is cut; the invention is an effective supplement to the traditional electric and manual sheet cutting mode and method.

Description

Technical Field

[0001] The present invention relates to the technical field of handheld manual tools, and in particular to a handheld manual tool for thin plate cutting and a use method thereof. Background Art

[0002] The application scope of the handheld manual cutting tool includes but is not limited to manual cutting of thin plates in the engineering plastics industry, manual cutting of thin wooden boards in the furniture industry, and paper cutting in the paper packaging industry; the materials of the thin plates in the engineering plastics and furniture industries to be cut include but are not limited to PP, PVC, PC, ABS, PE, PET and decorative films attached to wooden boards, etc., and the thickness of the thin plates to be cut ranges from 0.2 to 2.5 mm; the papers to be cut in the paper industry include but are not limited to coated paper, white board paper, boxboard, letterpress paper, mailing paper, etc., and the thickness of the papers to be cut ranges from 0.2 to 2.5 mm.

[0003] Commonly used cutting methods include cutting with electric equipment and cutting with traditional hand tools, among which traditional hand tools include: blades, scissors, hand saws, paper cutters, hand saws, hand planes, wood files, hand chisels, etc.

[0004] A handheld manual cutting tool for thin plate cutting is not only an effective supplement to traditional thin plate cutting methods and methods, but also has the following advantages:

[0005] a) Electric cutting equipment requires large investment, fixed site and trained professional technicians. This handheld manual cutting tool is easy to carry, flexible to operate, not restricted by site, and does not require specially trained technicians.

[0006] b) Compared with traditional manual cutting tools, the handheld manual cutting tool has the advantages of flexible operation, low labor intensity, high efficiency and smooth and neat cutting surface. Summary of the invention

[0007] The handheld manual cutting tool involved in the present application is an effective supplement to traditional thin plate cutting methods and approaches. It not only overcomes the problems of large investment in electric equipment and limitations on site and specialized personnel, but also overcomes the problems of low cutting efficiency, high labor intensity and rough cutting surface of the cut object of traditional manual tools.

[0008] The technical solution of the present invention is: a handheld manual tool for thin plate cutting, comprising a tool body, a lower cutter wheel assembly and an upper cutter wheel assembly; the lower cutter wheel assembly and the upper cutter wheel assembly are respectively rotatably mounted on the tool body, and the radial relative position of the lower cutter wheel assembly and the upper cutter wheel assembly can be adjusted, and by adjusting the radial relative position of the lower cutter wheel assembly and the upper cutter wheel assembly, the upper cutter wheel assembly and the lower cutter wheel assembly form a scissors edge that is convenient for shearing.

[0009] Preferably, the lower cutter wheel assembly comprises a lower bearing, a lower cutter wheel and a lower bearing screw shaft; the lower cutter wheel is fixed on the lower bearing and forms a lower cutter wheel assembly with the lower bearing screw shaft;

[0010] The upper cutter wheel assembly comprises an upper bearing, an upper cutter wheel and an upper bearing screw shaft; the upper cutter wheel is fixed on the upper bearing and forms the upper cutter wheel assembly with the upper bearing screw shaft.

[0011] Preferably, it also includes a bearing screw shaft nut; the upper cutter wheel assembly and the lower cutter wheel assembly are respectively locked on the tool body by the upper bearing screw shaft, the lower bearing screw shaft and the bearing screw shaft nut.

[0012] Preferably, it also includes an upper cutter wheel adjusting screw, a lower cutter wheel lower adjusting screw and a lower cutter wheel upper adjusting screw; the upper cutter wheel assembly adjusts its radial position on the tool body through the upper cutter wheel adjusting screw, and the lower cutter wheel assembly adjusts its radial position on the tool body through the lower cutter wheel lower adjusting screw and the lower cutter wheel upper adjusting screw.

[0013] Preferably, the upper and lower cutting wheels adjusted by the lower adjusting screw of the lower cutting wheel, the upper adjusting screw of the lower cutting wheel and the upper cutting wheel adjusting screw form scissor openings, and when the thin plate is sheared on the workbench, the thin plate is placed between the scissor openings.

[0014] Preferably, it also includes a handle and a handle fastening screw; the handle is locked on the tool body by the handle fastening screw.

[0015] Preferably, the upper and lower cutter wheels are made of alloy steel with strong rigidity and hardness and quenching hardening treatment, and the cutting surfaces are sharp without R-corner treatment.

[0016] A method for using a handheld manual tool for thin plate cutting, when used for thin plate cutting, the steps are as follows;

[0017] S1: When the cutter body is pushed by manpower on the object to be cut, the upper cutter wheel fixed on the bearing and the lower cutter wheel fixed on the bearing generate rolling friction on the object to be cut, so that the upper cutter wheel and the lower cutter wheel rotate with the bearing, and the rotation torque of the upper cutter wheel and the lower cutter wheel generates shear force on the object to be cut. When the shear force acting on the cutting part of the object to be cut is greater than the yield strength of the cutting part of the object, the object to be cut is cut;

[0018] S11: Rolling friction F generated by the cut sheet on the upper cutter wheel tr

[0019] F tr =μN t

[0020] Among them, μ is the rolling friction coefficient between the upper cutter wheel and the thin plate being cut;

[0021] Nt =M g +F n

[0022] Among them, M g is the weight of the cutting tool, F n It is the pressure applied perpendicular to the sheet being cut when the cutting tool is pushed manually;

[0023] S12: Rolling friction force F generated by the cut sheet on the lower cutter wheel br

[0024] F br =μN b

[0025] Among them, N b It is the reaction force of the thin plate on the lower cutter wheel perpendicular to the cutting point of the thin plate when the lower cutter wheel cuts the thin plate;

[0026] S2: Dynamic torque and resistance torque of upper and lower blade wheels

[0027] S21: Cut sheet O t The fulcrum is the upper cutter wheel, generating a torque M DT

[0028] M DT ≈F tr *R

[0029] Among them, R is the radius of the upper cutter wheel;

[0030] Since the thickness of the thin plate being cut is small, the force and arm of the upper cutter wheel torque are approximately calculated as F tr and R calculation;

[0031] S22: Cut sheet O b The fulcrum is the power torque M generated by the lower cutter wheel. DB

[0032] M DB ≈F br *R

[0033] Among them, the force and lever arm of the lower cutter wheel torque are approximately calculated according to F br and R calculation;

[0034] S23: Cut sheet O t The thin plate generates a resistance moment M on the upper cutter wheel. dt

[0035]

[0036] Among them, f tr When the upper cutter wheel cuts the thin plate, the thin plate is at the fulcrum O tThe reaction force along the normal direction of the upper cutter wheel is , T is the thickness of the thin plate being cut. Since the thickness of the thin plate is small, the resistance arm here is approximately calculate;

[0037] S24: Cut sheet O b The thin plate generates a resistance moment M on the lower cutter wheel. db

[0038]

[0039] Among them, f br When the lower cutter wheel cuts the thin plate, the thin plate is at the fulcrum O b The reaction force along the normal direction of the lower cutter wheel;

[0040] S3: Balance of dynamic torque and resistance torque, shear force of upper and lower cutter wheels on the cut sheet

[0041] S31: When the cutting tool is pushed by manpower, the upper and lower cutter wheels fixed on the bearings rotate to generate rotational torque; when the upper and lower cutter wheels rotate with the tool at a near-uniform speed and cut the thin plate, the rotational torque of the upper and lower cutter wheels and the resistance torque of the thin plate to the upper and lower cutter wheels are nearly balanced, that is:

[0042] M DT +M DB =M dt +M db

[0043]

[0044] Since the thickness T of the thin plate is much smaller than the radius R of the upper and lower cutter wheels, (f tr +f br ) is much larger than (F tr +F br );

[0045] S32: Shear force F of the cutter wheel on the cut sheet T

[0046] F T =f tr +f br

[0047] The thickness of the thin plate being cut is very small compared to the radius of the upper and lower cutter wheels. When the cutting tool is pushed by manpower, a large shear force F is generated at the cutting point of the thin plate due to the lever effect. T ;

[0048] S33: Shear force F T and the yield strength of the sheared plate

[0049] When the upper and lower blade wheels shear the thin plate, the shear force F T When the shear force acting on the thin plate is greater than the yield strength of the thin plate, the thin plate is sheared, that is:

[0050] F T ≥S*δ

[0051] Among them, S is the cross-sectional area of ​​the thin plate being cut, and δ is the yield strength coefficient of the sheared thin plate.

[0052] Preferably, the upper cutter wheel and the lower cutter wheel apply the lever principle to the cutting of the thin plate. By manually pushing the tool body, the upper cutter wheel fixed on the bearing and the lower cutter wheel fixed on the bearing generate rolling friction. The upper cutter wheel and the lower cutter wheel rotate with the movement of the tool. The rotational torque of the upper cutter wheel and the lower cutter wheel generates shear force on the cut thin plate. Since the thickness of the cut thin plate is much smaller than the radius of the upper cutter wheel and the lower cutter wheel, a large shear force is generated on the cut portion of the cut thin plate. When the shear force acting on the cut portion of the thin plate reaches the yield strength of the thin plate, the thin plate is cut.

[0053] Beneficial Effects

[0054] The present invention applies the lever principle to the cutting of thin plate objects. By manually pushing the handle on the tool body, the upper cutter wheel fixed on the bearing and the lower cutter wheel fixed on the bearing generate rolling friction, so that the upper cutter wheel and the lower cutter wheel rotate. The rolling torque of the upper cutter wheel and the lower cutter wheel generates shear force at the cutting position of the thin plate. Because the thickness of the cut thin plate is much smaller than the radius of the upper cutter wheel and the lower cutter wheel, the upper cutter wheel and the lower cutter wheel generate a large shear force at the cutting position of the thin plate. When the shear force acting on the cutting position of the thin plate reaches the yield strength of the thin plate to be cut, the thin plate is cut.

[0055] This handheld manual cutting tool is an effective supplement to traditional thin plate cutting methods and approaches, and not only overcomes the problems of large investment in electric equipment and limitations on site and specialized personnel, but also overcomes the problems of low cutting efficiency, high labor intensity and rough cutting surface of traditional manual tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 What is shown is a three-dimensional structure schematic diagram of a handheld manual tool for thin plate cutting of the present invention;

[0057] Figure 2 What is shown is a schematic diagram of the components of a handheld manual tool for thin plate cutting of the present invention;

[0058] Figure 3 The present invention shows a schematic diagram of the components of a lower cutter wheel assembly and an upper cutter wheel assembly of a handheld manual tool for thin plate cutting;

[0059] Figure 4The present invention shows a schematic diagram of the working state of the lower cutting wheel and the upper cutting wheel of the handheld manual tool for thin plate cutting, wherein (a) is a schematic diagram of the working state of the upper cutting wheel and the lower cutting wheel when the tool is pushed, and (b) is a schematic diagram of the scissors mouth formed by the upper cutting wheel and the lower cutting wheel;

[0060] Figure 5 What is shown is a force analysis diagram of the handheld manual tool used for thin plate cutting according to the present invention.

[0061] Figure 6 Shown is a diagram showing the relative positions of the upper and lower cutting wheels of the handheld manual tool of the present invention after assembly.

[0062] Explanation of the accompanying reference numerals: 1. tool body; 2. lower cutting wheel assembly; 3. upper cutting wheel assembly; 4. handle; 101. lower cutting wheel lower adjusting screw; 102. bearing screw shaft nut; 103. lower cutting wheel upper adjusting screw; 104. upper cutting wheel adjusting screw; 105. handle fastening screw; 201. lower bearing; 202. lower cutting wheel; 203. lower bearing screw shaft; 301. upper bearing; 302. upper cutting wheel; 303. upper bearing screw shaft. DETAILED DESCRIPTION

[0063] The present invention is described below with reference to the accompanying drawings and embodiments:

[0064] like Figure 1-Figure 6 The present invention provides a method for implementing thin plate cutting: a handheld manual tool for thin plate cutting, comprising a tool body 1, a lower cutter wheel assembly 2, an upper cutter wheel assembly 3, a bearing screw shaft nut 102, a lower bearing 201, a lower cutter wheel 202, an upper bearing screw shaft 203, an upper bearing 301, an upper cutter wheel 302, and a lower bearing screw shaft 303; the lower cutter wheel assembly 2 and the upper cutter wheel assembly 3 are respectively rotatably assembled on the tool body 1, and the radial relative position of the lower cutter wheel assembly 2 and the upper cutter wheel assembly 3 can be adjusted, and the upper cutter wheel 302 and the lower cutter wheel 202 form a scissors mouth that is convenient for shearing by adjusting the radial relative position of the lower cutter wheel assembly 2 and the upper cutter wheel assembly 3.

[0065] The upper cutter wheel 302 is fixed on the upper bearing 301 and forms an upper cutter wheel assembly 3 with the upper bearing screw shaft 303; the lower cutter wheel 202 is fixed on the lower bearing 201 and forms a lower cutter wheel assembly 2 with the lower bearing screw shaft 203; the upper cutter wheel assembly 3 and the lower cutter wheel assembly 2 are respectively assembled on the tool body 1, and are locked on the tool body 1 by the upper bearing screw shaft 303, the lower bearing screw shaft 203 and the bearing screw shaft nut 102;

[0066] When the cutter is pushed on the cutting plate, the upper cutter wheel 302 fixed on the bearing and the lower cutter wheel 202 fixed on the bearing generate rolling friction on the object to be cut, so that the upper cutter wheel 302 and the lower cutter wheel 202 rotate with the bearing, and the rotational torque of the upper cutter wheel 302 and the lower cutter wheel 202 generates shear force on the object to be cut.

[0067] The cutting tool further comprises an upper cutter wheel adjusting screw 104, a lower cutter wheel lower adjusting screw 101 and a lower cutter wheel upper adjusting screw 103; the upper cutter wheel assembly 3 is adjusted in radial direction on the tool body 1 by the upper cutter wheel adjusting screw 104, and the lower cutter wheel assembly 2 is adjusted in radial direction on the tool body 1 by the lower cutter wheel lower adjusting screw 101 and the lower cutter wheel upper adjusting screw 103; Figure 6 Schematic diagram of the relative position of the upper cutter wheel assembly 3 and the lower cutter wheel assembly 2 in the radial direction after adjustment by the adjusting screw, where D1 is the height of the maximum outer edge of the upper cutter wheel 302 above the Side A surface, 0.3 mm <D1<0.9mm。

[0068] like Figure 4 The upper knife wheel 302 and the lower knife wheel 202 are adjusted by the lower knife wheel lower adjusting screw 101, the lower knife wheel upper adjusting screw 103 and the upper knife wheel adjusting screw 104 to form a scissor mouth. When the thin plate is sheared on the workbench, the thin plate is placed between the scissor mouths; the upper knife wheel 302 and the lower knife wheel 202 are made of alloy steel with strong rigidity and hardness and quenched and hardened, and the cutting surface is sharp without R corner treatment.

[0069] like Figure 2 In this embodiment, it also includes a handle 4 and a handle fastening screw 105; the handle 4 is locked on the tool body 1 by the handle fastening screw 105.

[0070] A method for using a handheld manual tool for thin plate cutting, the steps are as follows;

[0071] S1: When the cutter body 1 is pushed by manpower on the object to be cut, the upper cutter wheel 302 fixed on the upper bearing 301 and the lower cutter wheel 202 fixed on the lower bearing 201 generate rolling friction on the object to be cut, so that the upper cutter wheel 302 and the lower cutter wheel 202 rotate along with the upper bearing 301 and the lower bearing 201, and the rotation torque of the upper cutter wheel 302 and the lower cutter wheel 202 generates shear force on the object to be cut. When the shear force acting on the cutting part of the object to be cut is greater than the yield strength of the cutting part of the object, the object to be cut is cut;

[0072] S11: Figure 5 As shown, the rolling friction force F generated by the cut sheet on the upper cutter wheel 302 tr

[0073] F tr =μNt

[0074] Wherein, μ is the rolling friction coefficient between the upper cutter wheel 302 and the thin plate being cut;

[0075] N t =M g +F n

[0076] Among them, M g is the weight of the cutting tool, F n It is the pressure applied perpendicular to the sheet being cut when the cutting tool is pushed manually;

[0077] S12: Figure 5 As shown, the rolling friction force F generated by the cut thin plate on the lower cutter wheel 202 br

[0078] F br =μN b

[0079] Among them, N b It is the reaction force of the thin plate on the lower knife wheel 202 perpendicular to the cutting position of the thin plate when the lower knife wheel 202 cuts the thin plate;

[0080] S2: Dynamic torque and resistance torque of upper cutter wheel 302 and lower cutter wheel 202

[0081] S21: Figure 5 As shown, the cut sheet O t The fulcrum is the power torque M generated by the upper cutter wheel 302. DT

[0082] M DT ≈F tr *R

[0083] Wherein, R is the radius of the upper cutter wheel 302;

[0084] Since the thickness of the thin plate being cut is small, the force and arm of the torque of the upper cutter wheel 302 are approximately calculated according to F tr and R calculation;

[0085] S22: Figure 5 As shown, the cut sheet O b The fulcrum is the power torque M generated by the lower cutter wheel 202. DB

[0086] M DB ≈F br *R

[0087] Among them, the force and the lever arm of the torque of the lower cutter wheel 202 are approximately calculated according to F br and R calculation;

[0088] S23: Figure 5 As shown, the cut sheet O t The thin plate generates a resistance moment M on the upper cutter wheel 302. dt

[0089]

[0090] Among them, f tr When the upper cutter wheel 302 cuts the thin plate, the thin plate is at the fulcrum O t The reaction force along the normal direction of the upper cutter wheel 302 is T, and the thickness of the thin plate being cut is small. The resistance arm here is approximately calculate;

[0091] S24: Figure 5 As shown, the cut sheet O b The thin plate generates a resistance moment M on the lower cutter wheel 202. db

[0092]

[0093] Among them, f br When the lower cutter wheel 202 cuts the thin plate, the thin plate is at the fulcrum O b The reaction force along the normal direction of the lower cutter wheel 202;

[0094] S3: Balance of dynamic torque and resistance torque, shear force of the upper cutter wheel 302 and the lower cutter wheel 202 on the cut sheet

[0095] S31: When the cutting tool is pushed by manpower, the upper cutter wheel 302 and the lower cutter wheel 202 fixed on the bearing rotate to generate a rotational torque; when the upper cutter wheel 302 and the lower cutter wheel 202 rotate with the tool moving at a near uniform speed and cut the thin plate, the rotational torque of the upper cutter wheel 302 and the lower cutter wheel 202 and the resistance torque of the thin plate to the upper cutter wheel 302 and the lower cutter wheel 202 are nearly balanced, that is:

[0096] M DT +M DB =M dt +M db

[0097]

[0098] Since the thickness T of the thin plate is much smaller than the radius R of the upper cutter wheel 302 and the lower cutter wheel 202, f tr +f br Much larger than F tr +F br ;

[0099] S32: Shear force F of the cutter wheel on the cut sheet T

[0100] F T =f tr +f br

[0101] The thickness T of the thin plate being cut is very small relative to the radius of the upper cutter wheel 302 and the lower cutter wheel 202. When the cutting tool is pushed by manpower, a large shear force F is generated at the cut portion of the thin plate due to the lever effect. T ;

[0102] S33: Shear force F T and the yield strength of the sheared plate

[0103] The shear force F of the upper knife wheel 302 and the lower knife wheel 202 shearing the thin plate T Acting on the sheared thin plate, when the shear force at the cutting point of the thin plate is greater than the yield strength of the thin plate, the thin plate is sheared, that is:

[0104] F T ≥S*δ

[0105] Where S is the cross-sectional area of ​​the thin plate being cut, and δ is the yield strength coefficient of the sheared thin plate.

[0106] Preferably, the upper cutter wheel 302 and the lower cutter wheel 202 apply the lever principle to the cutting of the thin plate. By manually pushing the tool body 1, the upper cutter wheel 302 fixed on the bearing and the lower cutter wheel 202 fixed on the bearing generate rolling friction. The upper cutter wheel 302 fixed on the bearing and the lower cutter wheel 202 fixed on the bearing rotate with the movement of the tool. The rotational torque of the upper cutter wheel 302 and the lower cutter wheel 202 generates a shear force on the cut thin plate. Since the thickness T of the cut thin plate is much smaller than the radius of the upper cutter wheel 302 and the lower cutter wheel 202, a large shear force is generated on the cut portion of the cut thin plate. When the shear force acting on the cut portion of the thin plate reaches the yield strength of the thin plate, the thin plate is cut.

[0107] Through the above steps, the cutting of the tool applies the principle of leverage, which provides an effective supplement to the traditional thin plate cutting methods and approaches. It not only overcomes the problems of large investment in electric equipment and limitations on site and specialized personnel, but also overcomes the problems of low cutting efficiency, high labor intensity and rough cutting surface of the object being cut of traditional manual tools.

[0108] In conjunction with the drawings, the above description describes the implementation modes of the present invention in detail, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A handheld manual tool for thin plate cutting, characterized in that: The invention comprises a tool body (1), a lower cutter wheel assembly (2) and an upper cutter wheel assembly (3); the lower cutter wheel assembly (2) and the upper cutter wheel assembly (3) are respectively rotatably mounted on the tool body (1); the radial relative position of the lower cutter wheel assembly (2) and the upper cutter wheel assembly (3) can be adjusted; by adjusting the radial relative position of the lower cutter wheel assembly (2) and the upper cutter wheel assembly (3), the upper cutter wheel assembly (3) and the lower cutter wheel assembly (2) form a scissor mouth that is convenient for shearing.

2. The handheld manual tool for thin plate cutting according to claim 1, characterized in that: The lower cutter wheel assembly (2) comprises a lower bearing (201), a lower cutter wheel (202) and a lower bearing screw shaft (203); the lower cutter wheel (202) is fixed on the lower bearing (201) and forms the lower cutter wheel assembly (2) with the lower bearing screw shaft (203); The upper cutter wheel assembly (3) comprises an upper bearing (301), an upper cutter wheel (302) and an upper bearing screw shaft (303); the upper cutter wheel (302) is fixed on the upper bearing (301) and forms the upper cutter wheel assembly (3) together with the upper bearing screw shaft (303).

3. The handheld manual tool for thin plate cutting according to claim 2, characterized in that: It also includes a bearing screw shaft nut (102); the upper cutter wheel assembly (3) and the lower cutter wheel assembly (2) are respectively locked on the tool body (1) through the upper bearing screw shaft (303), the lower bearing screw shaft (203) and the bearing screw shaft nut (102).

4. The handheld manual tool for thin plate cutting according to claim 3, characterized in that: The invention also comprises an upper cutter wheel adjusting screw (104), a lower cutter wheel lower adjusting screw (101) and a lower cutter wheel upper adjusting screw (103); the upper cutter wheel assembly (3) is adjusted in its radial direction on the tool body (1) by means of the upper cutter wheel adjusting screw (104), and the lower cutter wheel assembly (2) is adjusted in its radial direction on the tool body (1) by means of the lower cutter wheel lower adjusting screw (101) and the lower cutter wheel upper adjusting screw (103).

5. The handheld manual tool for thin plate cutting according to claim 4, characterized in that: The upper cutter wheel (302) and the lower cutter wheel (202) are adjusted by the lower cutter wheel lower adjusting screw (101), the lower cutter wheel upper adjusting screw (103) and the upper cutter wheel adjusting screw (104) to form a scissor opening. When the thin plate is sheared on the workbench, the thin plate is placed between the scissor openings.

6. The handheld manual tool for thin plate cutting according to claim 1, characterized in that: It also includes a handle (4) and a handle fastening screw (105); the handle (4) is locked on the tool body (1) by the handle fastening screw (105).

7. The handheld manual tool for thin plate cutting according to claim 2, characterized in that: The upper cutter wheel (302) and the lower cutter wheel (202) are made of alloy steel with strong rigidity and high hardness and are quenched and hardened, and the cutting surfaces are sharp without R-angle treatment.

8. A method for using a handheld manual tool for thin plate cutting, characterized in that: A handheld manual tool for thin plate cutting according to any one of claims 1 to 7, comprising the following steps; S1: When the cutter body is pushed by human power on the object to be cut, the upper cutter wheel (302) fixed on the bearing and the lower cutter wheel (202) fixed on the bearing generate rolling friction on the object to be cut, so that the upper cutter wheel (302) and the lower cutter wheel (202) rotate along with the bearing, and the rotation torque of the upper cutter wheel (302) and the lower cutter wheel (202) generates shear force on the object to be cut. When the shear force acting on the cutting part of the object to be cut is greater than the yield strength of the cutting part of the object, the object to be cut is cut; S11: Rolling friction force F generated by the cut sheet against the upper cutter wheel (302) tr F tr =μN t Wherein, μ is the rolling friction coefficient between the upper cutter wheel (302) and the thin plate being cut; N t =M g +F n Among them, M g is the weight of the cutting tool, F n It is the pressure applied perpendicular to the sheet being cut when the cutting tool is pushed manually; S12: Rolling friction force F generated by the cut sheet on the lower cutter wheel (202) br F br =μN b Among them, N b When the lower cutter wheel (202) cuts the thin plate, the thin plate reacts on the lower cutter wheel (202) perpendicular to the cutting position of the thin plate; S2: Dynamic torque and resistance torque of the upper cutter wheel (302) and the lower cutter wheel (202) S21: Cut sheet O t The upper cutter wheel (302) generates a torque M DT M DT ≈F tr *R Wherein, R is the radius of the upper cutter wheel (302); Since the thickness of the thin plate being cut is small, the force and arm of the dynamic moment of the upper cutter wheel (302) are approximately calculated as F tr and R calculation; S22: Cut sheet O b The fulcrum is the lower cutter wheel (202), and the torque M DB M DB ≈F br *R The force and lever arm of the dynamic moment of the lower cutter wheel (202) are approximately calculated as F br and R calculation; S23: Cut sheet O t The thin plate generates a resistance moment M on the upper cutter wheel (302) dt Among them, f tr When the upper cutter wheel (302) cuts the thin plate, the thin plate is at the fulcrum O t The reaction force along the normal direction of the upper cutter wheel (302) is , T is the thickness of the thin plate being cut. Since the thickness of the thin plate is small, the resistance arm here is approximately calculate; S24: Cut sheet O b The thin plate generates a resistance moment M on the lower cutter wheel (202) db Among them, f br When the lower cutter wheel (202) cuts the thin plate, the thin plate is at the fulcrum O b A reaction force in the normal direction of the lower cutter wheel (202); S3: Balance of dynamic torque and resistance torque, shear force of the upper cutter wheel (302) and the lower cutter wheel (202) on the cut sheet S31: When the cutting tool is pushed by manpower, the upper cutter wheel (302) and the lower cutter wheel (202) fixed on the bearing rotate to generate a rotational torque; when the upper cutter wheel (302) and the lower cutter wheel (202) rotate with the tool moving at a near uniform speed and cut the thin plate, the rotational torque of the upper cutter wheel (302) and the lower cutter wheel (202) and the resistance torque of the thin plate to the upper cutter wheel (302) and the lower cutter wheel (202) are nearly balanced, that is: M DT +M DB =M dt +M db Since the thickness T of the thin plate is smaller than the radius R of the upper cutter wheel (302) and the lower cutter wheel (202), (f tr +f br ) is greater than (F tr +F br ); S32: Shear force F of the cutter wheel on the cut sheet T F T =f tr +f br The thickness of the thin plate being cut is smaller than the radius of the upper cutter wheel (302) and the lower cutter wheel (202). When the cutting tool is pushed by manpower, a large shear force F is generated at the cutting portion of the thin plate due to the lever effect. T ; S33: Shear force F T and the yield strength of the sheared plate When the upper blade wheel (302) and the lower blade wheel (202) shear the thin plate, the shear force F T When the shear force acting on the thin plate is greater than the yield strength of the thin plate, the thin plate is sheared, that is: F T ≥S*δ Among them, S is the cross-sectional area of ​​the thin plate being cut, and δ is the yield strength coefficient of the sheared thin plate.

9. A method for using a handheld manual tool for thin plate cutting according to claim 8, characterized in that: The upper cutter wheel (302) and the lower cutter wheel (202) use the lever principle to cut the thin plate. By manually pushing the tool body (1), the upper cutter wheel (302) fixed on the bearing and the lower cutter wheel (202) fixed on the bearing generate rolling friction. The upper cutter wheel (302) and the lower cutter wheel (202) rotate along with the movement of the tool. The rotation torque of the upper cutter wheel (302) and the lower cutter wheel (202) generates shear force on the cut thin plate. Since the thickness of the cut thin plate is smaller than the radius of the upper cutter wheel (302) and the lower cutter wheel (202), a large shear force is generated at the cut portion of the cut thin plate. When the shear force acting on the cut portion of the thin plate reaches the yield strength of the cut thin plate, the thin plate is cut.

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