Numerical control laser cutting device for metal frame of sofa seat

Abstract

The application provides a metal frame numerical control laser cutting device for sofa seats, which is suitable for the field of sofa seat processing and comprises a numerical control laser cutting box, a positioning frame assembly is installed at the front end of the numerical control laser cutting box, a positioning frame is installed at the lower end of the positioning frame assembly, the positioning frame comprises two symmetrically distributed side positioning frames, the side positioning frame comprises an angle adjusting arm and an abutting frame, the abutting frame is used for directly acting on a special-shaped metal piece, the angle adjusting arm is used for adjusting the position of the abutting frame at multiple angles, the abutting frame comprises a plurality of unit supporting feet, the plurality of unit supporting feet are arranged in a multi-row and multi-column array and form a locally deformable self-adapting supporting surface, adaptive adjustment is realized according to the specific shape of the special-shaped piece, a stable and reliable clamping force point is provided, displacement or vibration of the special-shaped metal piece during the cutting process is avoided, the cutting precision and the processing efficiency are improved, and the requirement of high-precision processing can be met.

Description

Technical Field

[0001] This invention relates to the field of sofa and chair processing, and more particularly to a CNC laser cutting device for the metal frame of sofas and chairs. Background Technology

[0002] Metal frames for sofas and chairs are a common structural form in modern furniture. They are typically made of steel or aluminum alloys and manufactured through a series of processes including cutting, bending, welding, grinding, and surface treatment. These frames are characterized by high strength, structural stability, and diverse designs, and are widely used in office chairs, lounge chairs, and various commercial and residential sofas and chairs. In the production of metal frames, cutting is the first and most critical process, as its precision directly determines the quality and efficiency of subsequent welding and assembly. Currently, the processing flow from metal tubing or sheet metal to the finished frame generally includes: first, cutting the raw materials to the designed dimensions; then, bending or stamping the cut parts; next, assembling the parts into a frame through welding; and finally, finishing the product through surface treatment processes such as grinding, polishing, and spraying. Among these, the precision and efficiency of the cutting process have a significant impact on the overall production cycle and product quality.

[0003] With the development of CNC technology, laser cutting technology has been widely applied in the processing of metal frames for sofas and chairs. Existing CNC laser cutting equipment mainly includes a machine bed, laser cutting head, motion control system, and fixtures for fixing the workpiece. For tubular metal parts, CNC laser tube cutting machines are typically used. These machines hold the tube at both ends or one end using chucks or grippers, and the movement of the laser head and the rotation of the tube allow for precise cutting of tubes with regular cross-sections such as circles, squares, and rectangles. For sheet metal parts, flatbed laser cutting machines are used. Support bars and pressure plates on the worktable position and fix the sheet metal, and then the cutting is performed according to a preset program. These devices can achieve a certain degree of automation, improving cutting accuracy and efficiency, and meeting the production needs of conventional metal frame components.

[0004] The metal frames of sofas and chairs often contain various irregularly shaped components, such as armrest supports with curved surfaces, connectors with irregular cross-sections, and pre-bent irregularly shaped tubing. These irregularly shaped metal parts require precise positioning during laser cutting. However, due to their irregular shapes and uneven surfaces, existing general-purpose fixtures are difficult to adapt to the specific shape of these parts, failing to provide stable and reliable clamping points. This leads to workpiece displacement or vibration during cutting, affecting cutting accuracy and even causing workpiece scrap. Furthermore, for some irregularly shaped parts with complex three-dimensional curved surfaces, existing devices struggle to complete multi-angle, multi-position cutting in a single clamping operation, often requiring multiple clamping and positioning steps. This not only reduces processing efficiency but also increases cumulative errors, making it difficult to meet the requirements of high-precision machining. Summary of the Invention

[0005] The purpose of this invention is to provide a CNC laser cutting device for the metal frame of a sofa, which aims to solve the problem that irregular metal parts are present in the metal frame of the sofa, and that the irregular metal parts need to be accurately positioned and stably clamped during the process of cutting tubes and plates with a laser cutting machine. The device needs to adapt to the concave and convex shapes of the irregular metal parts of different sizes and provide a stable force point.

[0006] Specifically: A CNC laser cutting device for the metal frame of a sofa or chair includes a CNC laser cutting box. A positioning frame assembly is installed at the front end of the CNC laser cutting box. Several positioning frames for accurately positioning irregular metal parts are installed at the lower end of the positioning frame assembly. The positioning frames are used to accurately feed irregular metal parts into the CNC laser cutting box for laser cutting.

[0007] The positioning frame includes two symmetrically distributed side positioning frames, which act on the irregular metal part from both sides. The side positioning frames include:

[0008] A bracing frame is used to act directly on irregularly shaped metal parts;

[0009] An angle adjustment arm is mounted on the positioning frame assembly at one end and on the abutment frame at the other end; the angle adjustment arm is used to adjust the position of the abutment frame at multiple angles.

[0010] The support frame includes several unit support legs, which are arranged in multiple rows and columns to form an adaptive support surface that can be locally deformed.

[0011] Preferably, the angle adjusting arm includes:

[0012] An angle adjustment assembly is mounted on the support frame; the angle adjustment assembly is used to adjust the position of the support frame at multiple angles.

[0013] The support beam is assembled onto the positioning frame assembly;

[0014] A telescopic adjustment arm is mounted on the support beam; the telescopic adjustment arm uses the stable support force provided by the support beam to adjust the position of the angle adjustment assembly and the abutment frame.

[0015] Preferably, the telescopic adjustment arm includes an electric telescopic rod b, an electric telescopic rod c, and an electric telescopic rod d. The electric telescopic rod b is located in the X-axis direction and is used to adjust the positions of the electric telescopic rod c and the electric telescopic rod d in the X-axis direction. The electric telescopic rod c is located in the Y-axis direction and is used to adjust the position of the electric telescopic rod d in the Y-axis direction. The electric telescopic rod d is located in the Z-axis direction and is used to adjust the position of the angle adjustment assembly and the abutment frame in the Z-axis direction.

[0016] Preferably, the angle adjustment assembly includes:

[0017] Servo motor a is connected to the abutment frame via a rotating shaft mounted on its output shaft; the servo motor a is used to adjust the rotation angle of the abutment frame in a plane constructed by the X-axis and Z-axis.

[0018] Connecting plate a is fixed to servo motor a;

[0019] The mounting cavity b is located at the end of the connecting plate a that is furthest from the servo motor a.

[0020] Servo motor b is located inside the mounting cavity b and does not contact the inner wall of the mounting cavity b; the servo motor b is connected to the connecting plate a via a rotating shaft mounted on its output shaft; the servo motor b and servo motor a are perpendicularly distributed, and the servo motor b is used to rotate and adjust the rotation angle of the servo motor a and the support frame on the plane constructed by the X-axis and Y-axis.

[0021] Preferably, the angle adjustment assembly further includes:

[0022] Connecting plate b is fixed to servo motor b;

[0023] Mounting cavity a is opened at the end of the connecting plate b away from the servo motor b;

[0024] Servo motor c is located inside the mounting cavity a and does not contact the inner wall of the mounting cavity a; servo motor c is connected to the connecting plate b via a rotating shaft mounted on its output shaft; servo motor c and servo motor b are vertically distributed, and servo motor c is used to rotate and adjust the rotation angle of servo motor a, servo motor b and the support frame on the plane constructed by the Y axis and Z axis.

[0025] The connecting plate c is fixed on the servo motor c.

[0026] Preferably, the CNC laser cutting box has an operation panel installed on one side, a laser cutting cavity is opened on the CNC laser cutting box, a laser cutting table is set inside the laser cutting cavity, and a positioning frame assembly is installed above the laser cutting table; a feeding conveyor is installed at the front end of the laser cutting table.

[0027] Preferably, the abutment frame includes a positioning plate, and several unit support legs are arranged in multiple rows and columns on the positioning plate, and the positioning plate is mounted on the angle adjustment arm.

[0028] Preferably, the unit support leg includes:

[0029] Electric telescopic rod a, assembled on the positioning plate;

[0030] An adaptive support head is fixed at the end of the electric telescopic rod a that is furthest from the positioning plate;

[0031] Among them, the electric telescopic rod a is used to adjust the extension degree of the adaptive support head by telescoping.

[0032] Preferably, the adaptive support head includes:

[0033] Support pads are used to abut against irregularly shaped metal parts;

[0034] An adaptive adjustment head is mounted on the support pad; the adaptive adjustment head is used to adjust the support pad at multiple angles.

[0035] Preferably, the adaptive adjustment head includes:

[0036] It rests against the plate and is fixed on the support pad;

[0037] The positioning shell is inserted and fixed onto the abutment plate.

[0038] The ball is hinged to the positioning shell and has a hinge cavity; several sets of electromagnetic coils are laid on the inner wall of the hinge cavity, and the positioning shell can electromagnetically limit and attract the hinge ball by turning the electromagnetic coils on and off.

[0039] One end of the connecting post is fixed to the hinge ball; the other end of the connecting post is fixed to the connecting plate.

[0040] Several springs are connected at one end to the abutment plate and at the other end to the connecting plate; the springs are arranged in a ring array around the positioning shell.

[0041] In summary: When dealing with irregularly shaped metal components in sofa and chair frames, such as armrest supports with curved surfaces, connectors with irregular cross-sections, and pre-bent irregularly shaped tubing, the angle adjustment arm can adjust the position of the angle adjustment assembly and the backrest in the X, Y, and Z axes using a combination of electric telescopic rods b, c, and d, taking into account the irregular shape and uneven surface of these components. Furthermore, the angle adjustment assembly uses servo motor a to rotate in the plane formed by the X and Z axes to adjust the rotation angle of the backrest; servo motor b rotates in the plane formed by the X and Y axes to adjust the rotation angle of servo motor a and the backrest; and servo motor c rotates in the plane formed by the Y and Z axes to adjust the rotation angle of servo motors a, b, and the backrest, thus achieving a stable adjustment of the backrest. The system provides the point of force application; then, combined with the activation of several or more unit support legs on the support frame, the electric telescopic rods a extend and retract, allowing the support frame to form a locally deformable adaptive support surface through several unit support legs arranged in multiple rows and columns; simultaneously, when the electromagnetic coil is de-energized, the positioning shell loses its electromagnetic limiting adsorption on the hinge ball, allowing the support pad and the abutment plate to further adapt to the more subtle irregularities in the shape and surface unevenness of the irregular metal part, fitting adaptively onto the irregular metal part; then, the electromagnetic coil is energized again, causing the positioning shell to electromagnetically limit and adsorb the hinge ball again; this achieves adaptive adjustment according to the specific shape of the irregular part, providing a stable and reliable clamping force point, avoiding displacement or vibration of the irregular metal part during cutting, improving cutting accuracy and processing efficiency, and meeting the requirements of high-precision processing.

[0042] Preferably, the CNC laser cutting box is equipped with an adaptive control system, which includes a data acquisition and processing module and a control unit.

[0043] The data acquisition and processing module is used to acquire the three-dimensional data of the irregularly shaped metal part to be processed, determine the shape and surface model of the irregularly shaped metal part, and calculate the center of gravity position and at least one stable clamping point of the irregularly shaped metal part based on the shape and surface model; specifically, the data acquisition and processing module is used to acquire the three-dimensional model data of the irregularly shaped metal part; identify the curved surface area, cross-sectional change area and pre-bending area of ​​the irregularly shaped metal part according to the three-dimensional model data; calculate the center of gravity position of the irregularly shaped metal part based on the area distribution; and determine the position of at least one clamping point for stable holding according to the center of gravity position and the laser cutting path.

[0044] The control unit is connected to the data acquisition and processing module, electric telescopic rod a, electric telescopic rod b, electric telescopic rod c, electric telescopic rod d, servo motor a, servo motor b, servo motor c, and electromagnetic coil, and is configured as follows:

[0045] Based on the center of gravity position and the stable point of force, the first control command is generated to drive electric telescopic rods b, c, and d to adjust the position of the abutment frame in the X-axis, Y-axis, and Z-axis directions, respectively, and to drive servo motors a, b, and c to work together to adjust the abutment frame to the position and posture corresponding to the stable point of force.

[0046] Based on the local shape of the irregular metal part at the corresponding position, a second control command is generated to drive the servo motor a on several unit support feet at the corresponding position to extend and retract, so that several unit support feet together form an adaptive support surface that can deform locally to fit the surface of the irregular metal part.

[0047] After the abutment plate rotates adaptively relative to the positioning shell via the hinge ball to follow the subtle shape changes of the irregular metal part, a third control command is generated to drive the electromagnetic coil to be energized, generating electromagnetic force to attract and fix the hinge ball, locking the current fit state of the support pad.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] 1. When dealing with irregularly shaped metal parts for sofa and chair frames, such as armrest supports with curved surfaces, connectors with irregular cross-sections, and pre-bent irregularly shaped tubing, the angle adjustment arm can adjust the support frame to a stable position to provide a force point, taking into account the irregular shape and uneven surface of these irregularly shaped metal parts. Combined with the support frame's multiple unit support legs arranged in a multi-row, multi-column array, it forms a locally deformable adaptive support surface that fits snugly against the irregularly shaped metal part. This allows for adaptive adjustment based on the specific shape of the irregularly shaped part, providing a stable and reliable clamping force point, preventing displacement or vibration of the metal part during cutting, improving cutting accuracy and processing efficiency, and meeting the requirements of high-precision processing.

[0050] 2. The position and attitude rotation of the support frame in three-dimensional space are achieved by using electric telescopic rods b, c, and d in conjunction with servo motors a, b, and c, to coarsely position the support frame near the stable force point of the irregular metal part. Subsequently, the electric telescopic rods a on the arrayed unit support feet are used for local extension and retraction, forming a deformable adaptive support surface. This "global first, local later" approach decouples large-scale adjustment from fine contouring, ensuring rapid positioning while avoiding the contradiction of a single mechanism needing to simultaneously handle large stroke and high precision. At the same time, since the global adjustment has already placed the support frame in the appropriate position, the extension and retraction stroke of each unit support foot can be very small, thereby improving the response speed and accuracy of local contouring and reducing the design requirements of the electric telescopic rods a.

[0051] 3. After the unit support foot is initially attached via the electric telescopic rod a, the electromagnetic coil is first disconnected, allowing the hinge ball to rotate freely. This allows the support pad and the abutment plate to automatically adjust their posture according to the slight concavity and convexity of the irregular metal part. After complete attachment, the electromagnetic coil is energized again to lock the hinge ball. This "release first, lock later" sequential design allows the support surface to adapt to the micro-curvature of the irregular metal part in an unconstrained state, avoiding poor attachment caused by pre-tightening force or rigid constraints. After locking, the hinge ball is fixed, and the support pad becomes a rigid body, providing stable clamping force during the cutting process. At the same time, since the attachment surface is completely consistent with the irregular metal part, the clamping force is evenly distributed, effectively preventing local stress concentration that could lead to workpiece deformation. This transition from "flexible self-adaptation" to "rigid locking" balances attachment accuracy and clamping stability, which cannot be achieved by a single mechanism.

[0052] 4. Servo motors a, b, and c provide rotational freedom in three orthogonal planes, allowing the abutment frame to approach irregularly shaped metal parts at any angle. The arrayed unit support feet form a support surface aligned with the normal to the surface of the irregularly shaped metal part at that angle. This combination enables the abutment frame to not only adapt to the macroscopic tilt of the irregularly shaped metal part but also compensate for the change in the normal to the curved surface caused by rotation through the independent extension and retraction of the local unit support feet, thereby achieving multi-point uniform contact on complex curved surfaces. For example, for irregularly shaped pipes with twisted surfaces, the rotation mechanism can adjust the abutment frame to a direction perpendicular to the pipe axis, while the unit support feet automatically adjust their length according to the concavity and convexity of the pipe surface, forming a stable ring-shaped support, which greatly enhances the reliability of clamping.

[0053] 5. The adaptive control system pre-calculates the center of gravity and stable application point of the irregularly shaped metal part, guiding the electric telescopic rods a, b, c, and d, servo motors a, b, and c, and the electromagnetic coil to precisely move the support frame to the theoretically optimal position. Then, an adaptive mechanism composed of several unit support legs performs micro-fitting. This "theoretical guidance + practical adaptation" mode avoids the lag or oscillation that may occur when relying solely on sensor feedback, while ensuring that the clamping point is in the mechanically optimal position. Even with complex shapes, the irregularly shaped metal part can maintain balance during cutting, reducing vibration caused by center of gravity shift. Furthermore, since the application point is dynamically determined based on the center of gravity and cutting path, the clamping point can be automatically switched for different processes (such as cutting in different directions), enabling multi-faceted processing with a single clamping, significantly improving efficiency.

[0054] 6. The adaptive control system can automatically adjust according to the real-time data of irregular metal parts, realizing universal clamping of any complex irregular metal parts without changing the fixture, which greatly improves the production flexibility and automation level. At the same time, due to the uniform distribution of clamping force and the firm locking, the heat-affected zone and mechanical vibration during cutting are effectively suppressed, the processed metal frame has good dimensional consistency, and the scrap rate is greatly reduced. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the CNC laser cutting device for the metal frame of the sofa seat of the present invention.

[0056] Figure 2 This is a schematic diagram of the positioning frame in this invention;

[0057] Figure 3 for Figure 2 Schematic diagram of the middle positioning frame;

[0058] Figure 4 for Figure 3 Schematic diagram of the structure of the mid-angle adjustment arm;

[0059] Figure 5 for Figure 4 Schematic diagram of the center angle adjustment assembly;

[0060] Figure 6 for Figure 3 Schematic diagram of the middle buckle frame;

[0061] Figure 7 for Figure 6 Schematic diagram of the structure of the middle unit support leg;

[0062] Figure 8 for Figure 7 Schematic diagram of the adaptive support head;

[0063] Figure 9 for Figure 8 A schematic diagram of the adaptive adjustment head.

[0064] In the diagram: 1. CNC laser cutting box; 2. Laser cutting cavity; 3. ...; 4. Laser cutting table; 5. Feeding conveyor; 6. Operation panel; 7. Positioning frame; 8. Side positioning frame; 81. Angle adjustment arm; 82. Support frame; 811. Support beam; 812. Telescopic adjustment arm; 813. Angle adjustment assembly; 821. Positioning plate; 822. Unit support foot; 823. Electric telescopic rod a; 824. Adaptive support head; 8131. Servo... Servo motor a, 8132, connecting plate a, 8133, servo motor b, 8134, connecting plate b, 8135, mounting cavity a, 8136, servo motor c, 8137, connecting plate c, 8138, mounting cavity b; 8241, support pad, 8242, adaptive adjustment head, 8243, abutment plate, 8244, positioning shell, 8245, hinge ball, 8246, connecting column, 8247, connecting plate, 8248, spring. Detailed Implementation

[0065] 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.

[0066] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0067] In the embodiments of this invention, please refer to Figures 1-3 , Figure 6 and Figure 7 The CNC laser cutting device for the metal frame of a sofa and chair includes a CNC laser cutting box 1. A positioning frame assembly 3 is installed at the front end of the CNC laser cutting box 1. Several positioning frames 7 for accurately positioning irregular metal parts are installed at the lower end of the positioning frame assembly 3. The positioning frames 7 are used to accurately feed irregular metal parts into the CNC laser cutting box 1 for laser cutting.

[0068] The reason why the specific laser cutting head and laser cutting technology of the CNC laser cutting box 1 are not described in detail is that they are all existing technologies and can be purchased directly on the market or assembled by purchasing parts, etc. Whether they are disclosed or not does not affect the positioning frame 7 to be protected, so they will not be elaborated here.

[0069] Specifically, the positioning frame assembly 3 includes a top plate and several support legs. The array of support legs is distributed below the top plate, and the support legs are used to install the top plate and the positioning frame 7 at the front end of the CNC laser cutting box 1.

[0070] The positioning frame 7 includes two symmetrically distributed side positioning frames 8. The two side positioning frames 8 act on the irregular metal part from both sides. The side positioning frames 8 include:

[0071] Bracing frame 82 is used to act directly on dissimilar metal parts;

[0072] An angle adjustment arm 81 is mounted on the positioning frame assembly 3 at one end and on the abutment frame 82 at the other end; the angle adjustment arm 81 is used to adjust the position of the abutment frame 82 at multiple angles.

[0073] The support frame 82 includes several unit support legs 822, which are arranged in multiple rows and columns to form an adaptive support surface that can be locally deformed.

[0074] Therefore, when dealing with irregular metal parts such as armrest supports with curved shapes, connectors with irregular cross-sections, and pre-bent irregular-shaped tubes for sofa and chair metal frames, the angle adjustment arm 81 can adjust the abutment frame 82 to a position that can stably provide a force point, based on the irregular shape and uneven surface of these irregular metal parts. Combined with the multiple unit support legs 822 of the abutment frame 82 arranged in a multi-row, multi-column array, forming a locally deformable adaptive support surface, it adaptably fits the irregular metal part. This allows for adaptive adjustment according to the specific shape of the irregular part, providing a stable and reliable clamping force point, preventing displacement or vibration of the irregular metal part during cutting, improving cutting accuracy and processing efficiency, and meeting the requirements of high-precision processing.

[0075] In the embodiments of this invention, please refer to Figures 3-5 The angle adjusting arm 81 includes:

[0076] An angle adjustment assembly 813 is mounted on the abutment frame 82; the angle adjustment assembly 813 is used to adjust the position of the abutment frame 82 at multiple angles.

[0077] Support beam 811 is assembled on positioning frame assembly 3;

[0078] The telescopic adjustment arm 812 is mounted on the support beam 811; the telescopic adjustment arm 812 uses the stable support force provided by the support beam 811 to adjust the position of the angle adjustment assembly 813 and the abutment frame 82.

[0079] Furthermore, the telescopic adjustment arm 812 includes an electric telescopic rod b, an electric telescopic rod c, and an electric telescopic rod d. The electric telescopic rod b is located in the X-axis direction and is used to adjust the positions of the electric telescopic rod c and the electric telescopic rod d in the X-axis direction. The electric telescopic rod c is located in the Y-axis direction and is used to adjust the position of the electric telescopic rod d in the Y-axis direction. The electric telescopic rod d is located in the Z-axis direction and is used to adjust the position of the angle adjustment assembly 813 and the abutment frame 82 in the Z-axis direction.

[0080] It should be noted that the power supply and wiring methods of electric telescopic poles b, c, and d are all existing technologies. Their detailed structures can be found in existing literature and journals, and they can also be purchased directly from the market, or assembled from components purchased from the market, etc. They are not what this invention is intended to protect, and will not be described in detail here.

[0081] Please see Figure 4 and Figure 5 The angle adjustment assembly 813 includes:

[0082] Servo motor a8131 is connected to the abutment frame 82 via a rotating shaft mounted on its output shaft; the servo motor a8131 is used to adjust the rotation angle of the abutment frame 82 in a plane constructed by the X-axis and Z-axis.

[0083] The connecting plate a8132 is fixed on the servo motor a8131;

[0084] The mounting cavity b8138 is located at the end of the connecting plate a8132 away from the servo motor a8131.

[0085] Servo motor b8133 is located inside the mounting cavity b8138 and does not contact the inner wall of the mounting cavity b8138; servo motor b8133 is connected to the connecting plate a8132 via a rotating shaft mounted on its output shaft; servo motor b8133 and servo motor a8131 are perpendicularly distributed, and servo motor b8133 is used to rotate and adjust the rotation angle of servo motor a8131 and the abutment 82 in the plane constructed by the X-axis and Y-axis.

[0086] Please see Figure 4 and Figure 5 The angle adjustment assembly 813 further includes:

[0087] The connecting plate b8134 is fixed on the servo motor b8133;

[0088] The mounting cavity a8135 is located at the end of the connecting plate b8134 away from the servo motor b8133.

[0089] Servo motor c8136 is located inside the mounting cavity a8135 and does not contact the inner wall of the mounting cavity a8135; servo motor c8136 is connected to the connecting plate b8134 via a rotating shaft mounted on its output shaft; servo motor c8136 and servo motor b8133 are perpendicularly distributed, and servo motor c8136 is used to adjust the rotation angle of servo motor a8131, servo motor b8133 and the abutment 82 in the plane constructed by the Y-axis and Z-axis;

[0090] The connecting plate C8137 is fixed on the servo motor C8136.

[0091] Therefore, the angle adjustment arm 81 can adjust the position of the angle adjustment assembly 813 and the abutment frame 82 in the X-axis, Y-axis and Z-axis directions by combining electric telescopic rods b, c and d, based on the irregular shape and uneven surface of these irregular metal parts. Furthermore, the angle adjustment assembly 813 uses servo motor a8131 to rotate on the plane formed by the X-axis and Z-axis to adjust the rotation angle of the abutment frame 82, uses servo motor b8133 to rotate on the plane formed by the X-axis and Y-axis to adjust the rotation angle of servo motor a8131 and the abutment frame 82, and uses servo motor c8136 to rotate on the plane formed by the Y-axis and Z-axis to adjust the rotation angle of servo motor a8131, servo motor b8133 and the abutment frame 82, thus adjusting the abutment frame 82 to a position that stably provides a point of force.

[0092] It should be noted that the power supply and wiring methods of servo motors a8131, b8133, and c8136 are all existing technologies. Their detailed structures can be found in existing literature and journals, and they can also be purchased directly from the market, or assembled from components purchased from the market, etc. They are not the subject of this invention and will not be described in detail here.

[0093] In the embodiments of this invention, please refer to Figure 1 The CNC laser cutting box 1 has an operation panel 6 installed on one side. The CNC laser cutting box 1 has a laser cutting cavity 2. The laser cutting cavity 2 has a laser cutting table 4 inside. The positioning frame assembly 3 is installed above the laser cutting table 4. The front end of the laser cutting table 4 has a feeding conveyor 5.

[0094] In the embodiments of this invention, please refer to Figure 3 and Figure 6 The abutment frame 82 includes a positioning plate 821, and several unit support feet 822 are arranged in multiple rows and columns on the positioning plate 821. The positioning plate 821 is installed on the angle adjustment arm 81 (specifically, the positioning plate 821 is installed on the rotating shaft mounted on the output shaft of the servo motor a8131).

[0095] For further details, please see Figure 6 and Figure 7 The unit support foot 822 includes:

[0096] The electric telescopic pole a823 is mounted on the positioning plate 821;

[0097] An adaptive support head 824 is fixed at the end of the electric telescopic rod a823 away from the positioning plate 821.

[0098] Among them, the electric telescopic rod a823 is used to adjust the extension degree of the adaptive support head 824 by telescoping.

[0099] Please see Figure 7 and Figure 8 The adaptive support head 824 includes:

[0100] Support pad 8241 is used to abut against irregularly shaped metal parts;

[0101] An adaptive adjustment head 8242 is mounted on the support pad 8241; the adaptive adjustment head 8242 is used to adjust the support pad 8241 at multiple angles.

[0102] Therefore, the abutment frame 82 activates the electric telescopic rod a823 on one or more unit support legs 822 in a localized area. The electric telescopic rod a823 extends and retracts, so that the abutment frame 82, through a number of unit support legs 822 arranged in multiple rows and columns, forms a locally deformable adaptive support surface, which adapts to fit the irregular metal part.

[0103] Please see Figure 8 and Figure 9 The adaptive adjustment head 8242 includes:

[0104] It abuts against plate 8243 and is fixed on support pad 8241;

[0105] The positioning shell 8244 is inserted and fixed onto the abutment plate 8243;

[0106] The hinge ball 8245 is hinged to the positioning shell 8244 and has a hinge cavity; several sets of electromagnetic coils are laid on the inner wall of the hinge cavity, and the positioning shell 8244 electromagnetically limits and attracts the hinge ball 8245 by turning the electromagnetic coils on and off.

[0107] One end of the connecting post 8246 is fixed to the hinge ball 8245; the other end of the connecting post 8246 is fixed to the connecting plate 8247.

[0108] Several springs 8248 are connected at one end to the abutment plate 8243 and at the other end to the connecting plate 8247; the several springs 8248 are arranged in a ring array around the positioning shell 8244.

[0109] It should be noted that the electric telescopic pole a823 and the electromagnetic coil, as well as the power supply wiring method of the electric telescopic pole a823 and the electromagnetic coil, are all existing technologies. Their detailed structures can be found in existing literature and journals, and they can also be purchased directly on the market, or components can be purchased on the market to assemble them, etc.; they are not what this invention is intended to protect, and will not be described in detail here.

[0110] Therefore, the abutment frame 82 activates the electric telescopic rods a823 on several or more unit support feet 822 in a localized area. The electric telescopic rods a823 extend and retract, so that the abutment frame 82, through several unit support feet 822 arranged in multiple rows and columns, forms a locally deformable adaptive support surface. At the same time, when the electromagnetic coil is de-energized, the positioning shell 8244 loses its electromagnetic limiting adsorption on the hinge ball 8245, so that the support pad 8241 and the abutment plate 8243 further adapt to the more subtle irregular shape and uneven surface characteristics of the irregular metal part, and fit together on the irregular metal part. When the electromagnetic coil is energized again, the positioning shell 8244 causes the hinge ball 8245 to be electromagnetically limited and adsorbed again.

[0111] In summary: When dealing with irregularly shaped metal components of sofa and chair frames, such as armrest supports with curved surfaces, connectors with irregular cross-sections, and pre-bent irregularly shaped tubing, the angle adjustment arm 81 can adjust the position of the angle adjustment assembly 813 and the abutment bracket 82 in the X, Y, and Z axes using a combination of electric telescopic rods b, c, and d, taking into account the irregular shape and uneven surface of these irregularly shaped metal components. Furthermore, the angle adjustment assembly 813 uses servo motor a8131 to rotate on the plane formed by the X and Z axes to adjust the rotation angle of the abutment bracket 82; servo motor b8133 rotates on the plane formed by the X and Y axes to adjust the rotation angle of servo motor a8131 and the abutment bracket 82; and servo motor c8136 rotates on the plane formed by the Y and Z axes to adjust the rotation angle of servo motors a8131, b8133, and the abutment bracket 82, thus achieving a stable adjustment of the abutment bracket 82. The system determines the location of the force application point; then, in conjunction with the abutment frame 82, it activates several or more unit support legs 822 with electric telescopic rods a823. The electric telescopic rods a823 extend and retract, allowing the abutment frame 82 to form a locally deformable adaptive support surface through several unit support legs 822 arranged in multiple rows and columns. Simultaneously, when the electromagnetic coil is de-energized, the positioning shell 8244 loses its electromagnetic limiting adsorption on the hinge ball 8245, allowing the support pad 8241 and the abutment plate 8243 to further adapt to the more subtle irregularities in the shape and the unevenness of the surface of the irregular metal part, fitting adaptively onto the irregular metal part. Then, energizing the electromagnetic coil again causes the positioning shell 8244 to electromagnetically limit and adsorb the hinge ball 8245 again. This achieves adaptive adjustment according to the specific shape of the irregular part, providing a stable and reliable clamping force point, preventing displacement or vibration of the irregular metal part during cutting, improving cutting accuracy and processing efficiency, and meeting the requirements of high-precision processing.

[0112] The position and attitude rotation of the abutment frame 82 in three-dimensional space are achieved by using electric telescopic rods b, c, and d in conjunction with servo motors a8131, b8133, and c8136, thus coarsely positioning the abutment frame 82 near the stable force point of the irregular metal part. Subsequently, the electric telescopic rods a823 on the arrayed unit support feet 822 are used for local extension and retraction, forming a deformable adaptive support surface. This "global first, local later" approach decouples large-scale adjustment from fine contouring, ensuring rapid positioning while avoiding the contradiction of a single mechanism needing to simultaneously handle large stroke and high precision. At the same time, since the abutment frame 82 has been placed in the appropriate position by global adjustment, the extension and retraction stroke of each unit support foot 822 can be very small, thereby improving the response speed and accuracy of local contouring and reducing the design requirements of the electric telescopic rods a823.

[0113] After the unit support foot 822 is initially attached via the electric telescopic rod a823, the electromagnetic coil is first disconnected, allowing the hinge ball 8245 to rotate freely. This allows the support pad 8241 and the abutment plate 8243 to further adjust their posture automatically according to the slight concavity and convexity of the irregular metal part. After complete attachment, the electromagnetic coil is energized again to lock the hinge ball 8245. This "release first, lock later" sequential design allows the support surface to adapt to the micro-curvature of the irregular metal part in an unconstrained state, avoiding poor attachment caused by pre-tightening force or rigid constraints. After locking, the hinge ball 8245 is fixed, and the support pad 8241 becomes a rigid body, providing stable clamping force during the cutting process. At the same time, since the attachment surface is completely consistent with the irregular metal part, the clamping force is evenly distributed, effectively preventing local stress concentration that could lead to workpiece deformation. This transition from "flexible self-adaptation" to "rigid locking" balances attachment accuracy and clamping stability, which cannot be achieved by a single mechanism.

[0114] Servo motors a8131, b8133, and c8136 provide rotational freedom in three orthogonal planes, allowing the abutment frame 82 to approach irregularly shaped metal parts at any angle. The arrayed unit support feet 822 can form a support surface that is aligned with the normal to the surface of the irregularly shaped metal part at this angle. This combination allows the abutment frame 82 to not only adapt to the macroscopic tilt of the irregularly shaped metal part, but also to compensate for the change in the normal to the curved surface caused by rotation through the independent extension and retraction of the local unit support feet 822, thereby achieving multi-point uniform contact on complex curved surfaces. For example, for irregularly shaped pipes with twisted curved surfaces, the rotation mechanism can adjust the abutment frame 82 to a direction perpendicular to the axis of the pipe, while the unit support feet 822 automatically adjust their length according to the concavity and convexity of the pipe surface, forming a stable ring-shaped support, which greatly enhances the reliability of clamping.

[0115] In this embodiment of the invention, the CNC laser cutting box 1 is equipped with an adaptive control system, which includes a data acquisition and processing module and a control unit.

[0116] The data acquisition and processing module is used to acquire the three-dimensional data of the irregularly shaped metal part to be processed, determine the shape and surface model of the irregularly shaped metal part, and calculate the center of gravity position and at least one stable clamping point of the irregularly shaped metal part based on the shape and surface model; specifically, the data acquisition and processing module is used to acquire the three-dimensional model data of the irregularly shaped metal part; identify the curved surface area, cross-sectional change area and pre-bending area of ​​the irregularly shaped metal part according to the three-dimensional model data; calculate the center of gravity position of the irregularly shaped metal part based on the area distribution; and determine the position of at least one clamping point for stable holding according to the center of gravity position and the laser cutting path.

[0117] The control unit is connected to the data acquisition and processing module, electric telescopic poles a823, b, c, and d, servo motors a8131, b8133, c8136, and the electromagnetic coil, and is configured as follows:

[0118] Based on the center of gravity position and the stable point of force, the first control command is generated to drive the electric telescopic rods b, c, and d to adjust the position of the abutment 82 in the X-axis, Y-axis, and Z-axis directions, respectively, and to drive the servo motors a8131, b8133, and c8136 to work together to adjust the abutment 82 to the position and posture corresponding to the stable point of force.

[0119] Based on the local shape of the irregular metal part at the corresponding position, a second control command is generated to drive the servo motors a8131 on several unit support feet 822 at the corresponding position to extend and retract, so that several unit support feet 822 together form an adaptive support surface that can deform locally to fit the surface of the irregular metal part.

[0120] After the abutment plate rotates adaptively relative to the positioning shell 8244 via the hinge ball 8245 to follow the subtle shape changes of the irregular metal part, a third control command is generated to drive the electromagnetic coil to be energized, generating electromagnetic force to attract and fix the hinge ball 8245, locking the current fitting state of the support pad 8241.

[0121] The adaptive control system pre-calculates the center of gravity and stable application point of the irregularly shaped metal part, guiding the electric telescopic rods a823, b, c, and d, servo motors a8131, b8133, and c8136, along with the electromagnetic coil, to precisely move the abutment frame 82 to the theoretically optimal position. Then, an adaptive mechanism composed of several unit support feet 822 performs micro-fitting. This "theoretical guidance + practical adaptation" model avoids the lag or oscillation that may occur when relying solely on sensor feedback, while ensuring the clamping point is in the mechanically optimal position. Even with complex shapes, the irregularly shaped metal part can maintain balance during cutting, reducing vibrations caused by center of gravity shift. Furthermore, since the application point is dynamically determined based on the center of gravity and cutting path, the clamping point can be automatically switched for different processes (such as cutting in different directions), enabling multi-faceted processing with a single clamping operation, significantly improving efficiency.

[0122] The adaptive control system can automatically adjust according to the real-time data of irregular metal parts, realizing universal clamping of any complex irregular metal parts without changing the fixture, which greatly improves the production flexibility and automation level. At the same time, due to the uniform distribution of clamping force and the firm locking, the heat-affected zone and mechanical vibration during cutting are effectively suppressed, the processed metal frame has good dimensional consistency, and the scrap rate is greatly reduced.

[0123] In the description of this invention, unless otherwise stated, "a number" means two or more. It should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0124] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A CNC laser cutting device for the metal frame of a sofa seat, comprising a CNC laser cutting box (1), wherein a positioning frame assembly (3) is installed at the front end of the CNC laser cutting box (1), and a plurality of positioning frames (7) for precisely positioning irregular metal parts are installed at the lower end of the positioning frame assembly (3), the positioning frames (7) being used to precisely feed the irregular metal parts into the CNC laser cutting box (1) for laser cutting; characterized in that, The positioning frame (7) includes two symmetrically distributed side positioning frames (8). The two side positioning frames (8) act on the irregular metal part from both sides. The side positioning frames (8) include: A bracing frame (82) is used to act directly on dissimilar metal parts; An angle adjustment arm (81) is mounted on the positioning frame assembly (3) at one end and on the abutment frame (82) at the other end; the angle adjustment arm (81) is used to adjust the position of the abutment frame (82) at multiple angles; Among them, the support frame (82) includes several unit support legs (822), which are arranged in multiple rows and columns to form an adaptive support surface that can be locally deformed.

2. The CNC laser cutting device for the metal frame of a sofa chair according to claim 1, characterized in that, The angle adjusting arm (81) includes: An angle adjustment assembly (813) is mounted on the abutment frame (82); the angle adjustment assembly (813) is used to adjust the position of the abutment frame (82) at multiple angles; The support beam (811) is mounted on the positioning frame assembly (3); Telescopic adjustment arm (812) is mounted on the support beam (811); the telescopic adjustment arm (812) uses the stable support force provided by the support beam (811) to adjust the position of the angle adjustment assembly (813) and the abutment frame (82).

3. The CNC laser cutting device for the metal frame of a sofa chair according to claim 2, characterized in that, The telescopic adjustment arm (812) includes an electric telescopic rod b, an electric telescopic rod c, and an electric telescopic rod d. The electric telescopic rod b is located in the X-axis direction and is used to adjust the positions of the electric telescopic rod c and the electric telescopic rod d in the X-axis direction. The electric telescopic rod c is located in the Y-axis direction and is used to adjust the position of the electric telescopic rod d in the Y-axis direction. The electric telescopic rod d is located in the Z-axis direction and is used to adjust the positions of the angle adjustment assembly (813) and the abutment frame (82) in the Z-axis direction.

4. The CNC laser cutting device for the metal frame of a sofa chair according to claim 2, characterized in that, The angle adjustment assembly (813) includes: Servo motor a (8131) is connected to the abutment frame (82) via a rotating shaft mounted on its output shaft; the servo motor a (8131) is used to rotate and adjust the rotation angle of the abutment frame (82) in a plane constructed by the X-axis and Z-axis; Connecting plate a (8132) is fixed on servo motor a (8131); The mounting cavity b (8138) is opened at the end of the connecting plate a (8132) away from the servo motor a (8131); Servo motor b (8133) is located inside the mounting cavity b (8138) and does not contact the inner wall of the mounting cavity b (8138); the servo motor b (8133) is connected to the connecting plate a (8132) by a rotating shaft mounted on its output shaft; the servo motor b (8133) is perpendicular to the servo motor a (8131) and is used to adjust the rotation angle of the servo motor a (8131) and the abutment (82) on the plane constructed by the X-axis and Y-axis.

5. The CNC laser cutting device for the metal frame of a sofa chair according to claim 4, characterized in that, The angle adjustment assembly (813) also includes: Connecting plate b (8134) is fixed on servo motor b (8133); The mounting cavity a (8135) is opened at the end of the connecting plate b (8134) away from the servo motor b (8133); Servo motor c (8136) is located inside the mounting cavity a (8135) and does not contact the inner wall of the mounting cavity a (8135); the servo motor c (8136) is connected to the connecting plate b (8134) by a rotating shaft mounted on its output shaft; the servo motor c (8136) and the servo motor b (8133) are perpendicularly distributed, and the servo motor c (8136) is used to rotate and adjust the rotation angle of the servo motor a (8131), the servo motor b (8133) and the abutment (82) on the plane constructed by the Y-axis and Z-axis; The connecting plate c (8137) is fixed on the servo motor c (8136).

6. The CNC laser cutting device for the metal frame of a sofa chair according to claim 1, characterized in that, The CNC laser cutting box (1) has an operation panel (6) installed on one side. The CNC laser cutting box (1) has a laser cutting cavity (2) and a laser cutting table (4) is set inside the laser cutting cavity (2). The positioning frame assembly (3) is installed above the laser cutting table (4). A feeding conveyor (5) is installed at the front end of the laser cutting table (4).

7. The CNC laser cutting device for the metal frame of a sofa chair according to claim 1, characterized in that, The abutment frame (82) includes a positioning plate (821), and several unit support feet (822) are arranged in multiple rows and columns on the positioning plate (821). The positioning plate (821) is mounted on the angle adjustment arm (81).

8. The CNC laser cutting device for the metal frame of a sofa chair according to claim 7, characterized in that, The unit support foot (822) includes: Electric telescopic rod a (823) is mounted on positioning plate (821); An adaptive support head (824) is fixed at the end of the electric telescopic rod a (823) away from the positioning plate (821); Among them, the electric telescopic rod a (823) is used to adjust the extension degree of the adaptive support head (824) by telescopic extension.

9. The CNC laser cutting device for the metal frame of a sofa chair according to claim 8, characterized in that, The adaptive support head (824) includes: Support pad (8241) is used to abut against irregularly shaped metal parts; An adaptive adjustment head (8242) is mounted on the support pad (8241); the adaptive adjustment head (8242) is used to adjust the support pad (8241) at multiple angles.

10. The CNC laser cutting device for the metal frame of a sofa chair according to claim 9, characterized in that, The adaptive adjustment head (8242) includes: It abuts against the plate (8243) and is fixed on the support pad (8241); The positioning shell (8244) is inserted and fixed on the abutment plate (8243); The hinge ball (8245) is hinged to the positioning shell (8244) in a hinge cavity; several sets of electromagnetic coils are laid on the inner wall of the hinge cavity, and the positioning shell (8244) electromagnetically limits and attracts the hinge ball (8245) by turning the electromagnetic coils on and off. One end of the connecting post (8246) is fixed to the hinge ball (8245); the other end of the connecting post (8246) is fixed to the connecting plate (8247); Several springs (8248) are connected at one end to the abutment plate (8243) and at the other end to the connecting plate (8247); the several springs (8248) are arranged in a ring array around the positioning shell (8244).

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