A portable cold-bending steel cutting machine

Abstract

This invention provides a portable cold-bent steel section cutting machine, including a steel section cutting blade, a blade holder, a base, and a driving device. The steel section cutting blade has steel section cutting holes, including a bottom edge slot, a first side edge slot, and a second side edge slot. Outwardly expanding stress relief grooves are provided on the outer side of the connection between the first side edge slot and the bottom edge slot, and on the outer side of the end position of the second side edge slot. The blade holder has a blade guide groove, a blade holder opening on one side, and a blade holder cutting hole on the other side. The driving device connects to and drives the steel section cutting blade to move within the blade guide groove. This invention is small in size, easy to move and use, and provides a buffering effect during the cutting of cold-bent steel sections, improving the service life of the steel section cutting blade and preventing the cold-bent steel section from becoming unusable due to outward expansion deformation of the opening after cutting.

Description

Technical Field

[0001] This invention relates to the field of channel steel cutting equipment, and more specifically to a portable cold-formed steel cutting machine for cutting special cold-formed steel sections in channel steel. Background Technology

[0002] Channel steel is a building material with a U-shaped cross-section, including an opening, and is widely used in various buildings, underground equipment, and machinery. In ordinary construction sites, channel steel often needs to be cut according to specific conditions. In current construction environments, channel steel is mainly cut using large cutting equipment such as abrasive wheels. However, abrasive wheels and other large cutting equipment are not specifically designed for channel steel. Generally, channel steel has a relatively small cross-sectional area, making the use of large cutting equipment overkill. Furthermore, the cutting precision is low, often resulting in burrs on the cut surface. The cut surface can also rust due to the combined effects of heat and cooling water during cutting, affecting the smoothness of the cut. Additionally, large cutting equipment is difficult to move and cumbersome to use.

[0003] Chinese patent CN203817132U discloses a portable channel steel cutting device, which uses the principle of relative motion between male and female molds to cut channel steel. The device has a small overall size, solving the problem of inconvenience in using the aforementioned large equipment.

[0004] However, ordinary channel steel, due to its overall thickness and high strength, can maintain its original shape under high shear stress, thus it can be cut using the aforementioned portable channel steel cutting device. However, among the existing categories of channel steel, there exists a type of cold-formed steel that is smaller in size, lighter in weight, and has thinner walls. The cross-sectional diagram of this cold-formed steel is approximately as follows... Figure 7As shown, this includes the bottom and sides. To accommodate this type of cold-formed steel, the aforementioned portable channel steel cutting device needs to be redesigned with smaller dimensions. However, because the blades, which serve as the male and female molds, must withstand significant reaction forces from the cold-formed steel during cutting, especially at the corners on the outer edges and the ends of the sides, the stress is concentrated in these areas, resulting in extremely high pressure during shearing. When the blades are small, their overall strength and hardness are insufficient, making the male and female molds prone to damage. This affects the normal operation of the aforementioned portable channel steel cutting device and increases operating costs. Furthermore, the small area at the corners and ends of the two sides of the cold-formed steel leads to highly concentrated stress, making the steel, due to its thinness, highly susceptible to deformation under concentrated stress. In practice, it was found that if the cold-formed steel is cut with the opening facing the cutting direction of the blade, the bottom edge of the cut steel will be bent, rendering it unusable. However, if the cold-formed steel is cut with the opening facing away from the cutting direction of the blade, under normal circumstances, the two sides will form straight edge 101 and straight edge 103 respectively. Although the overall shape will not be flattened, the ends of the cold-formed steel will be subjected to concentrated stress, causing the original straight edges 101 and 103 on both sides to undergo slight deformation, forming something like... Figure 7 The deformed straight edge 102 and deformed straight edge 104 shown will cause the opening at the cut of the cold-formed steel to open outward, forming a flared mouth, which will cause the cold-formed steel to deform at the cut and thus affect its actual use. Summary of the Invention

[0005] The technical problem to be solved by this invention is that when cutting cold-formed steel, large cutting equipment is difficult to move, inconvenient to use, and has poor processing effect. The cutting parts of small equipment are easily damaged and have a short service life. Furthermore, when cutting cold-formed steel, the stress is concentrated at the corners and the ends of the sides, which causes the cut cold-formed steel to deform and fail to meet the engineering requirements.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] This invention provides a portable cold-bending steel section cutting machine, comprising at least a blade holder and a steel section cutting blade. One side of the blade holder has a blade holder cutting hole for accommodating the steel section, and the other side has a blade holder opening. The steel section cutting blade has a steel section cutting hole adapted to the blade holder cutting hole. The steel section cutting blade is in contact with the side of the blade holder with the steel section cutting hole and is movably disposed relative to the blade holder. The steel section cutting blade has at least two working positions: an initial working position, in which the positions of the blade holder cutting hole and the steel section cutting hole coincide; and a post-cutting position, in which the positions of the blade holder cutting hole and the steel section cutting hole are staggered. The direction from the initial working position to the post-cut position is the cutting direction; the steel section cutting hole includes at least a bottom edge slot and a first side slot and a second side slot respectively connected to both ends of the bottom edge slot, wherein the bottom edge slot is inclined relative to the cutting direction, and an opening end is formed between the end of the first side slot away from the bottom edge slot and the end of the second side slot away from the bottom edge slot; in the post-cut position, the opening end is closer to the initial working position relative to the bottom edge slot, and the first side slot is closer to the initial working position relative to the second side slot; at least the position where the first side slot connects to the bottom edge slot and the position of the end of the second side slot away from the bottom edge slot are provided with outwardly expanding stress relief grooves.

[0008] Based on practical engineering experience, after cutting, the open end should be closer to the initial working position relative to the bottom edge slot. This cutting method ensures that the cold-formed steel will not undergo significant deformation. Furthermore, the bottom edge slot needs to form a certain angle with the cutting direction to prevent excessive deformation of the cut cold-formed steel. In the above technical features, the first side slot is closer to the initial working position relative to the second side slot after cutting. The specific design structure is as follows: when the cutting direction of the steel cutting blade is from top to bottom, the first side slot is located above, and the second side slot is located below; when the cutting direction of the steel cutting blade is from bottom to top, the second side slot is located above, and the first side slot is located below. Furthermore, when the steel cutting blade cuts in other directions, only adaptive modifications to the above scheme are needed, which will not be elaborated upon here.

[0009] In this solution, based on practical engineering experience, setting outward-expanding stress relief grooves at the connection point between the first side groove and the bottom groove, and at the end of the second side groove, is sufficient to meet the requirements. Specifically, because of the stress relief grooves, during cutting, the outward-expanding grooves can diffuse and transfer concentrated stress in all directions. Furthermore, the stress relief grooves do not directly contact the cold-formed steel, thus avoiding stress concentration at the connection point between the bottom and side edges and at the end of the side edges. This prevents the cold-formed steel from deforming due to stress concentration at corners, avoiding the problem of the cold-formed steel becoming unusable after deformation. Moreover, after the stress is diffused, the pressure exerted by the cold-formed steel on the cutting hole at locations where stress concentration would normally occur is lower, helping to protect the cutting blade.

[0010] Therefore, the advantages of the above solution are its simple overall structure and well-controlled size of the portable cold-formed steel cutting machine, which helps to reduce the size of the device for easy carrying. After the cold-formed steel is cut, the cut surface is neat and smooth, and the shape of the cut does not change. The outward-expanding stress relief groove can also buffer the pressure generated at the corner of the steel cutting hole, preventing the steel cutting blade from cracking due to stress concentration at the corner, and preventing the cold-formed steel from deforming during the cutting process.

[0011] Preferably, the blade holder is provided with a blade guide groove for guiding the movement of the steel cutting blade, and the steel cutting blade is connected to the blade guide groove.

[0012] Preferably, it further includes a base and a drive device for driving the steel cutting blade to move, wherein the blade holder and the drive device are respectively connected to both sides of the base.

[0013] Furthermore, the base includes an upper base and a lower base, the upper base being fixedly connected to the driving device, the lower base being detachably connected to the tool holder, and the upper base being detachably connected to the lower base.

[0014] Furthermore, it also includes a connecting shaft, one end of which is fixedly connected to the output end of the drive device, and the other end of which passes through the base and is fixedly connected to the blade.

[0015] Preferably, the angle between the bottom edge slot and the cutting direction is 40°-50°.

[0016] Based on practical engineering experience, the cutting effect is optimal when the angle between the bottom edge slot and the cutting direction is 40°-50°.

[0017] Preferably, an outwardly expanding stress relief groove is provided at the outer side of the connection position between the second side slot and the bottom slot and / or at the end position of the first side slot.

[0018] Preferably, the tool holder is a split structure, including a first tool holder located on the side corresponding to the tool holder opening and a second tool holder located on the side corresponding to the tool holder cutting hole.

[0019] The advantage of this design is that, since the first blade holder is not subjected to force during cutting, it can be made of lower-cost materials, which helps to reduce costs. In addition, the split structure makes it easy to disassemble and replace the blades more convenient.

[0020] Preferably, the ends of the first side slot and the second side slot away from the bottom slot are respectively provided with second steel hook foot slots, and the second steel hook foot slots on both sides are folded in opposite directions.

[0021] Furthermore, at least one set of opposing first steel hook foot slots is provided between the two ends of the first side slot and between the two ends of the second side slot.

[0022] The advantages of the above solution are that some cold-formed steel sections have hooks at their side ends, and the hook slots in the second steel section can accommodate the hooks. Furthermore, the hook slots in the first steel section can accommodate cold-formed steel sections of different sizes; when the dimensions of the cold-formed steel section change, the hooks can pass through the first steel hook slots. Moreover, since the first steel hook slot is located in the middle of the side slots, the extended portion of the side slots can achieve an effect similar to a stress-relieving groove, thus also releasing stress.

[0023] In summary, the portable cold-bending steel cutting machine described above has the following advantages:

[0024] 1. The overall structure is simple and easy to carry;

[0025] 2. The stress relief groove can prevent deformation of the cold-bent steel after cutting, and at the same time protect the steel cutting blade;

[0026] 3. In the preferred embodiment, the portable cold-bending steel cutting machine is easy to disassemble and maintain;

[0027] 4. In the preferred embodiment, the portable cold-bending steel cutting machine can adapt to cold-bending steel of different sizes, thus improving the applicability of the device. Attached Figure Description

[0028] Figure 1 The diagram shown is of a steel cutting blade.

[0029] Figure 2 As shown Figure 1 A partial view of part A;

[0030] Figure 3 The diagram shown is a schematic representation of one side of a preferred embodiment of a portable cold-bending steel cutting machine;

[0031] Figure 4 The diagram shown is a schematic representation of the other side of the embodiment;

[0032] Figure 5 The image shown is a partial exploded view of an embodiment;

[0033] Figure 6 The diagram shows the blade guide groove and the steel cutting blade.

[0034] Figure 7 The diagram shown is a schematic of the cold-formed steel section after partial deformation caused by concentrated stress in the project.

[0035] Explanation of reference numerals in the attached drawings: 1-Steel cutting blade, 10-Bottom edge, 101-Straight edge one, 102-Deformed straight edge one, 103-Straight edge two, 104-Deformed straight edge two, 11-Steel cutting hole, 110-Stress relief groove, 111-Bottom edge slot, 112-Open end, 113-First steel hook foot slot, 114-Second steel hook foot slot, 1151-First side slot, 1152-Second side slot, 2-Tool holder, 20-Blade guide groove, 21-First tool holder, 210-Tool holder opening, 22-Second tool holder, 23-Tool holder cutting hole, 3-Base, 31-Upper base, 32-Lower base, 4-Connecting shaft, 5-Shaft sleeve, 6-Drive device. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] A preferred embodiment of the portable cold-bending steel cutting machine provided by the present invention is as follows: Figures 3 to 6 As shown, the portable cold-bending steel cutting machine includes a base 3, a drive unit 6, a blade holder 2, and a steel cutting blade 1. The blade holder 2 is fixedly connected to the base 3, and a blade guide groove 20 is provided inside the blade holder 2. The steel cutting blade 1 is movably connected within the blade guide groove 20. The drive unit 6 is fixedly connected to the base 3, and the drive unit 6 also drives the steel cutting blade 1 to move along the blade guide groove 20.

[0040] The cutter holder 2 has a cutter holder opening 210 on one side and a cutter holder cutting hole 23 on the other side to accommodate the passage of cold-formed steel. The drive device 6 is fixedly connected to the base 3. It also includes a connecting shaft 4, one end of which is connected to the output end of the drive device 6, and the other end passes through the base 3 and the cutter holder 2 respectively and is fixedly connected to the steel cutting blade 1. The connecting shaft 4 can drive the steel cutting blade 1 to move within the blade guide groove 20.

[0041] One preferred embodiment of the steel cutting blade 1 is, for example... Figure 1 As shown, the steel cutting blade 1 is provided with a steel cutting hole 11 for accommodating cold-formed steel sections. The steel cutting hole 11 includes a bottom edge slot 111 and a first side slot 1151 and a second side slot 1152 connected to both ends of the bottom edge slot 111. The steel cutting hole 11 also includes a non-connected open end 112, which is located between the ends of the first side slot 1151 and the second side slot 1152 away from the bottom edge slot 111.

[0042] The steel cutting blade 1 can move along the blade guide groove 20 under the action of the drive device 6. The steel cutting blade 1 can move to the initial working position and the post-cutting position under the drive of the drive device 6. When the steel cutting blade 1 is in the initial working position, the steel cutting hole 11 coincides with the cutter holder cutting hole 23; when the steel cutting blade 1 is in the post-cutting position, the steel cutting hole 11 and the cutter holder cutting hole 23 are separated and misaligned.

[0043] To prevent the corners and side openings of the cold-formed steel from deforming due to stress concentration during cutting, an outwardly expanding stress relief groove 110 is provided on the outer side of the connection between the first side slot 1151 and the bottom slot 111. At the same time, an outwardly expanding stress relief groove 110 is also provided on the outer side of the end of the second side slot 1152 away from the bottom slot 111. The outwardly expanding stress relief groove 110 can provide a buffering effect when the steel cutting blade 1 is shearing, buffering and releasing the concentrated stress transmitted to the end of the second side slot 1152 away from the bottom slot 111 and the connection between the first side slot 1151 and the bottom slot 111, reducing the pressure of the cold-formed steel acting on the steel cutting hole 11, and providing protection for the steel cutting blade 1.

[0044] When the steel cutting blade 1 is in the post-cutting position, the open end 112 is closer to the initial working position relative to the bottom edge slot 111. Specifically, in this embodiment, the driving device 6 achieves cutting by pushing the steel cutting blade 1 downward. At this time, the open end 112 is located above the bottom edge slot 111. This installation method can avoid the problem of cold-formed steel being bent. Of course, depending on the driving method of the driving device 6, the above scheme only needs to be adapted, which will not be elaborated here. In this preferred embodiment, the angle between the bottom edge slot 111 and the cutting direction is designed to be 40°-50°. Engineering practice results show that this design is more conducive to cutting cold-formed steel.

[0045] According to the above-described method, without the stress relief groove 110, the straight edge 101 of the cold-formed steel corresponding to the second side slot 1152 on the lower side will deform under stress, and the straight edge 103 corresponding to the first side slot 1151 will also bend under concentrated stress. The straight edge 101 and the straight edge 103 form a shape like... Figure 7 The deformed straight edge 102 and deformed straight edge 104 shown cause the cold-formed steel to flare at the opening, making the cut opening of the cold-formed steel unusable. After setting the stress relief groove 110, the stress relief groove 110 can provide a buffer for the cold-formed steel, diffusing the stress transmitted to the stress relief groove 110 in all directions rather than concentrating it at a single point at the corner of the cold-formed steel. This effectively prevents the problem of stress concentration at the corner of the cold-formed steel causing micro-deformation, allowing the sides of the cold-formed steel to remain as... Figure 7 The dashed lines in the middle show the original straight edge 101 and straight edge 103.

[0046] In this embodiment, as Figure 3As shown, the first side slot 1151 is located at the top, and the second side slot 1152 is located at the bottom. The cutting direction is when the driving device 6 moves the steel cutting blade 1 away from the driving device 6. In this embodiment, the stress relief groove 110 is provided on the outer side of the connection position between the first side slot 1151 and the bottom slot 111, and the stress relief groove 110 is also provided at the end of the second side slot 1152. The reason for this design is as follows:

[0047] Based on the actual stress analysis, in the illustrated embodiment, the force exerted by the upper first side slot 1151 on the cold-formed steel will cause the cold-formed steel to form a deformed straight edge 104. This force causes the side of the cold-formed steel to bend outward. The main reason for this deformation is that the cold-formed steel is subjected to concentrated stress at the connection position between the first side slot 1151 and the bottom slot 111. Therefore, a stress relief groove 110 is provided at this location. The lower second side slot 1152 is subjected to concentrated force at its end, which directly leads to the formation of an outward deformed straight edge 102. This deformation will directly cause the opening of the cold-formed steel to expand outward, making it unusable. Therefore, an outwardly expanding stress relief groove 110 is provided at the end of the lower second side slot 1152.

[0048] The above design corresponds to the cutting direction from top to bottom. When the driving device 6 drives the steel cutting blade 1 to cut the cold-formed steel in a pulling manner from bottom to top, only an adaptive change is needed. The changed structure can be analyzed and the stress relief groove 110 can be designed according to the above process. The specific structure will not be elaborated here.

[0049] Of course, the outer edge of the connection position between the end of the first side slot 1151 on the upper side and the connection position of the second side slot 1152 on the lower side and the bottom slot 111 can also be provided with an outwardly expanding stress relief groove 110, which has the same effect as the stress relief groove 110 mentioned above. However, considering that the stress concentration at these two places has a small impact on the deformation of cold-formed steel, it is not provided in this embodiment, but that does not mean it cannot be provided.

[0050] The ends of cold-formed steel sections are generally folded inwards and have hooks. The length of the side of the cold-formed steel section varies depending on the application. To accommodate cold-formed steel sections of different sizes, preferably, the ends of the first side slot 1151 and the second side slot 1152 away from the bottom slot 111 are provided with opposing folded second steel hook slots 114 adapted to the hooks of the cold-formed steel section. Simultaneously, opposing folded first steel hook slots 113 are provided between the two ends of the first side slot 1151 and the second side slot 1152. The hooks at the open side of cold-formed steel sections of different sizes can pass through different cold-formed steel hook slots and be inserted into the steel cutting hole 11. Therefore, it is not necessary to change the blade when cutting different cold-formed steel sections, increasing the versatility of the same steel cutting blade 1. Moreover, in this design, when the cold-formed steel passes through the first steel hook groove 113, the extended portions of the first side groove 1151 and the second side groove 1152 can play a role similar to the stress relief groove 110, and can also prevent the cold-formed steel from deforming.

[0051] Considering that the side of the tool holder 2 with the tool holder cutting hole 23 needs to withstand shearing force and requires high material strength, while the other side with the tool holder opening 210 does not bear force, preferably, the tool holder 2 includes a first tool holder 21 with the tool holder opening 210 and a second tool holder 22 with the tool holder cutting hole 23. The first tool holder 21 and the second tool holder 22 are both detachably fixedly connected to the base 3. The advantage of this design is that, when disassembling the separate first tool holder 21 and the second tool holder 22, only one side needs to be removed to easily remove the steel cutting blade 1 set in the blade guide groove 20. At the same time, the first tool holder 21 and the second tool holder 22 can be made of different materials. The second tool holder 22 uses a material with higher hardness because it needs to withstand force, while the first tool holder 21 can use a common material, which helps to reduce production costs.

[0052] In the above scheme, the blade holder opening 210 can also be set in the shape of the steel cutting hole 11. However, this design results in two cutting points, located at the connection surfaces of the steel cutting blade 1 and the first blade holder 21, and the steel cutting blade 1 and the second blade holder 22, respectively. Although the cutting purpose can be achieved, a portion of the cold-formed steel retained inside the steel cutting blade 1 will be lost, resulting in waste. Of course, a simple through hole can also be set directly, but this design requires control of the stroke of the connecting shaft 4. Improper control will cause the cold-formed steel to collide with the lower edge of the blade holder opening 210. In this embodiment, the blade holder opening 210 extends to the bottom of the side of the first blade holder 21 facing away from the base 3. During the cutting process, the portion of cold-formed steel fixed by the steel cutting blade 1 will not collide with the bottom edge of the first blade holder 21.

[0053] To facilitate disassembly and maintenance, the base 3 includes an upper base 31 and a lower base 32. The upper base 31 is fixedly connected to the drive device 6, and the lower base 32 is detachably connected to the tool holder 2. Furthermore, the first tool holder 21 and the second tool holder 22 are detachably connected to the lower base 32, which serves to fix the positions of the first tool holder 21 and the second tool holder 22. The detachable connection between the upper base 31 and the lower base 32 facilitates installation and disassembly. The purpose of setting up the upper base 31 and the lower base 32 is that when installing the tool holder 2, the tool holder 2 can be first fixedly connected to the lower base 32, the drive device 6 can be fixedly connected to the upper base 31, and then the upper base 31 can be fixedly connected to the lower base 32. This design makes it easier to connect the tool holder 2 and the drive device 6, ensuring that the length of the connecting parts used for the connection is not too long.

[0054] In order to reduce the wear of the connecting shaft 4, a bushing 5 is provided inside the upper base 31 and the lower base 32. The bushing 5 is fitted on the outside of the connecting shaft 4 to provide movement limit and protection functions for the connecting shaft 4.

[0055] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable cold-formed steel cutting machine, comprising at least a tool holder (2) and a steel cutting blade (1), one side of the tool holder (2) is provided with a tool holder cutting hole (23) for accommodating the passage of cold-formed steel, and the other side is provided with a tool holder opening (210); the steel cutting blade (1) is provided with a steel cutting hole (11) matched with the tool holder cutting hole (23), the steel cutting blade (1) is attached to one side of the tool holder (2) provided with the steel cutting hole (11) and is movably arranged relative to the tool holder (2), the steel cutting blade (1) has at least two working positions: an initial working position, in which the tool holder cutting hole (23) is coincident with the steel cutting hole (11); and a post-cutting position, in which the tool holder cutting hole (23) is staggered with the steel cutting hole (11), and the direction of the steel cutting blade (1) moving from the initial working position to the post-cutting position is the cutting direction; the steel cutting hole (11) comprises at least a bottom edge slot hole (111), a first side edge slot hole (1151) and a second side edge slot hole (1152) connected to both ends of the bottom edge slot hole (111) respectively, wherein the bottom edge slot hole (111) is arranged obliquely relative to the cutting direction, and the opening end (112) is formed between the end of the first side edge slot hole (1151) away from the bottom edge slot hole (111) and the end of the second side edge slot hole (1152) away from the bottom edge slot hole (111); in the post-cutting position, the opening end (112) is closer to the initial working position relative to the bottom edge slot hole (111), and the first side edge slot hole (1151) is closer to the initial working position relative to the second side edge slot hole (1152); at least the position where the first side edge slot hole (1151) is connected to the bottom edge slot hole (111) and the end position of the second side edge slot hole (1152) away from the bottom edge slot hole (111) are provided with an outwardly expanded stress release slot (110); the ends of the first side edge slot hole (1151) and the second side edge slot hole (1152) away from the bottom edge slot hole (111) are respectively provided with a second steel hook slot hole (114), and the second steel hook slot holes (114) on both sides are arranged in opposite directions; at least one set of first steel hook slot holes (113) are arranged opposite to each other between the two ends of the first side edge slot hole (1151) and the two ends of the second side edge slot hole (1152); the tool holder (2) is of a split structure, comprising a first tool holder (21) corresponding to one side of the tool holder opening (210) and a second tool holder (22) corresponding to one side of the tool holder cutting hole (23), and the first tool holder (21) and the second tool holder (22) are respectively detachably fixedly connected to the base (3); the tool holder (2) is provided with a blade guide slot (20) for guiding the movement of the steel cutting blade (1), and the steel cutting blade (1) is connected in the blade guide slot (20). ​ ​ ​ characterized in that ​ ​ ​ ​ ​ ​ 2. The portable cold-formed steel section cutting machine of claim 1, wherein, ​ 3. The portable cold-formed steel stud cutter of claim 1, wherein, The base (3) and the driving device (6) for driving the profile steel cutting blade (1) to move are further included, and the blade seat (2) and the driving device (6) are connected to two sides of the base (3) respectively.

4. The portable cold-formed steel section cutting machine of claim 3, wherein, The base (3) includes an upper base (31) and a lower base (32), the upper base (31) is fixedly connected with the driving device (6), the lower base (32) is detachably connected with the blade seat (2), and the upper base (31) is detachably connected with the lower base (32).

5. The portable cold-formed steel section cutting machine of claim 3, wherein, A connecting shaft (4) is further included, one end of the connecting shaft (4) is fixedly connected with the output end of the driving device (6), and the other end of the connecting shaft (4) penetrates through the base (3) and is fixedly connected with the blade.

6. The portable cold-formed steel stud cutter of claim 1, wherein, The included angle between the bottom edge slot hole (111) and the cutting direction is 40-50°.

7. The portable cold-formed steel stud cutter of claim 1, wherein, The second side edge slot hole (1152) is provided with an outwardly expanded stress release slot (110) outside the connecting position of the bottom edge slot hole (111) and / or the end position of the first side edge slot hole (1151). The included angle between the bottom edge slot hole (111) and the cutting direction is 40-50°. The second side edge slot hole (1152) is provided with an outwardly expanded stress release slot (110) outside the connecting position of the bottom edge slot hole (111) and / or the end position of the first side edge slot hole (1151).

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