A multi-station automatic milling device for automobile bright trim strip

Abstract

The application discloses a kind of multi-station automatic milling equipment of automobile bright decorative strip, it is related to the technical field of automobile parts processing, to solve the technical problem that milling head is difficult to be in-depth to processing site and carry out milling processing when current milling equipment is processed automobile rubber bright decorative strip, including clamping assembly installed on work platform.The application is fixed by the design of clamping assembly and bending assembly, the middle part of automobile bright decorative strip;Bending plate drives the both ends of bright decorative strip to bend downward, so that the whole is in the state of inverted U type bending at clamping assembly, expose the to-be-processed part of bright decorative strip bending, provide sufficient operating space for the cutter of milling assembly to extend, eliminate the processing blind area caused by to-be-processed part being blocked, without secondary clamping adjustment, avoid positioning error caused by multiple clamping from the root.The application is designed by clamping assembly and bending assembly, through the form of inverted U type bending, break through the technical limitation that to-be-processed part is difficult to expose in traditional processing.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, and more specifically, to a multi-station automatic milling machine for automotive bright trim strips. Background Technology

[0002] Automotive bright trim strips are important decorative and functional components of car bodies, widely used in door frames, window edges, grille trim, trunk trim, and other locations. They not only enhance the aesthetics and sophistication of the car's appearance but also provide some protection for the edges of the body panels. The structural characteristics of automotive bright trim strips typically feature slender strips with complex milled contours, chamfers, and grooves, requiring high precision in dimensional accuracy, surface finish, and processing efficiency during milling.

[0003] With the rapid development of the automotive industry, consumers are increasingly demanding more refined car exteriors. At the same time, car manufacturers are becoming more stringent in their standards for parts production cycle time, cost control, and quality consistency. This places higher demands on milling equipment for automotive bright trim strips.

[0004] Existing automotive trim strips often have a groove on the back to allow glue to be injected, thus securely attaching the trim strip to the vehicle body. However, since conventional grooves often rely solely on glue and friction for connection, the trim strip is prone to detachment over time or due to environmental factors. This is especially common with rubber trim strips. Therefore, milling a recessed clip with a physical locking effect on the back of the automotive rubber trim strip can greatly enhance its overall stability.

[0005] However, existing milling equipment is often designed for vertical milling, with the milling cutter moving horizontally or vertically. Because the locking block is recessed within a groove, and the machining area is located within this groove, the milling cutter cannot easily reach the machining area for milling. Therefore, we propose a multi-station automatic milling machine for automotive bright trim strips. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a multi-station automatic milling equipment for automotive bright trim strips, so as to solve the technical problem that the milling cutter head is difficult to penetrate into the processing part to perform milling processing when the current milling equipment processes automotive rubber bright trim strips.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a multi-station automatic milling equipment for automotive bright trim strips, comprising a clamping assembly, a bending assembly, and a milling assembly mounted on a work platform;

[0008] The clamping assembly includes a clamping post and a pressing structure, which are used to fix the middle part of the automotive bright trim strip, facilitating subsequent bending work.

[0009] The bending assembly includes a bending plate, which is used to bend the automotive bright trim strip so that the part to be processed at the bend of the automotive bright trim strip is exposed, allowing the cutting tool of the milling assembly to extend into the part to be processed.

[0010] When the two sets of bending plates symmetrically arranged on both sides of the automotive bright trim strip are in a bent state, both ends of the automotive bright trim strip point downwards and the whole strip is bent in an inverted U-shape at the clamping assembly.

[0011] Preferably, the clamping structure includes a clamping frame, a clamping plate, a flipping drive unit, a connecting pipe, and a vacuum pump;

[0012] The two sets of clamping plates are movably connected to both sides of the clamping frame. Several flipping drive units are installed inside the clamping frame and are driven by the two sets of clamping plates. The two sets of connecting pipes are connected to the two sets of clamping plates, and the vacuum pump is connected to the two sets of connecting pipes. The vacuum pump is installed on the clamping frame.

[0013] Preferably, when the flipping drive units drive the two sets of pressure plates to flip, the two sets of pressure plates are in a V-shaped tilt state. The pressure plates adsorb the suspended buckle block left after the bottom of the milled part of the bright trim strip through the connecting pipe and vacuum pump, so that the buckle block bends upward and forms an L-shaped angle with the bright trim strip.

[0014] Preferably, the bending plate is made of an electrically heated shape memory alloy. When the bending plate is in a heated state, it is bent to form a bent workpiece. When the bending plate is in a cooled state, it is straight.

[0015] Preferably, the phase transition temperature of the electrothermal memory alloy is 50-70°C. The electrothermal memory alloy reduces the hardness and modulus of the rubber through the phase transition temperature, thereby reducing the bending force and enabling the automotive bright trim strip to bend.

[0016] Preferably, the bending assembly further includes a mounting frame, a flexible connector, a temperature control unit, and a heat exchange flexible belt;

[0017] One end of the bent plate is mounted on the mounting frame, one end of the flexible connector is connected to the mounting frame, and the other end of the flexible connector is connected to the other end of the bent plate. The temperature control unit is mounted inside the mounting frame, and the heat exchange flexible strip is coiled around the bent plate and connected to the temperature control unit.

[0018] Preferably, the bending assembly further includes an adsorption structure, which includes a mounting block, an adsorption tube, and a micro vacuum pump;

[0019] Several mounting blocks are equidistantly mounted on the bending plate. Several adsorption heads of the adsorption tube are respectively connected to several mounting blocks. The bending plate is divided into several parallel plates, and several adsorption heads are respectively located in the gaps of several plates. The micro vacuum pump is connected to the adsorption tube and is mounted on the mounting frame. Several adsorption heads are used to adsorb the automotive bright trim panel and bend together with the bending plate.

[0020] Preferably, the front end of the adsorption head is provided with a concave spherical groove, and the inner wall of the spherical groove is provided with a spiral protrusion. The spiral protrusion is used to make the airflow form a centrally converging negative pressure field to increase the adsorption force when the adsorption head draws in air. The front end of the adsorption head is provided with a number of inclined protrusions in an equidistant ring. The inclined protrusions are used to increase the resistance between the adsorption head and the automotive bright trim panel, so that the adsorption head can better guide the bending of the automotive bright trim panel.

[0021] Preferably, two sets of milling components are symmetrically arranged on the outside of the working platform, and the milling components include a first linear drive unit, a second linear drive unit, and a milling unit;

[0022] The second linear drive unit is installed at the output end of the first linear drive unit, and the milling unit is installed at the output end of the second linear drive unit.

[0023] Preferably, two sets of lifting brackets are also installed on both sides of the working platform. Before the bending plate is bent, the lifting brackets are lowered from the horizontal plane to leave bending space for the automotive trim panel.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention, through the design of a clamping component and a bending component, uses the clamping component, through the cooperation of clamping posts and a pressing structure, to firmly fix the central area of ​​the automotive bright trim strip, providing a stable positioning reference for subsequent bending and milling operations and preventing workpiece displacement during processing. The bending component employs two sets of symmetrically arranged bending plates, driving both ends of the bright trim strip to bend downwards, resulting in an inverted U-shaped bend at the clamping component. This design precisely exposes the area to be processed at the bend of the bright trim strip, providing ample operating space for the milling component's cutting tool and eliminating blind spots caused by obstruction of the processing area. The milling component can then directly and precisely mill the exposed area without secondary clamping and adjustment, fundamentally avoiding positioning errors caused by multiple clamping operations. This invention, through the design of the clamping and bending components and the inverted U-shaped bend, overcomes the technical limitation of traditional processing methods that make it difficult to expose the processing area.

[0026] 2. This invention utilizes an electrically heated shape memory alloy bending plate, along with a mounting frame, flexible connectors, a temperature control unit, and a heat exchange belt to form a temperature-controlled drive system. The phase change temperature of this shape memory alloy is precisely set between 50-70℃. The temperature control unit uniformly heats the plate via the heat exchange belt wound around it. When the temperature reaches the phase change threshold, the bending plate automatically deforms and bends, driving the automotive trim strip to bend synchronously into an inverted U-shape, precisely exposing the area to be processed at the bend. Crucially, the low-temperature heating range of 50-70℃ simultaneously reduces the hardness and modulus of the rubber layer on the trim strip surface, significantly reducing the external force required for bending and preventing tearing of the rubber layer or deformation of the substrate. The flexible connectors connect the mounting frame to the end of the bending plate, helping to maintain the bending shape and preventing deformation rebound. When heating stops and the temperature drops below the phase change temperature, the bending plate automatically returns to a straight state, facilitating workpiece placement and repositioning, and adapting to different processing rhythms. This invention, through the design of the bending plate, overcomes the technical limitations of traditional mechanical bending, which involves large external forces and easy damage, and significantly improves the accuracy, stability, and workpiece yield of bright trim bending processing.

[0027] 3. This invention utilizes an adsorption structure design, with thirty mounting blocks equidistantly arranged on the bending plate. The adsorption heads of the adsorption tubes are precisely positioned at the gaps between the four plates. A micro-vacuum pump provides negative pressure through the adsorption tubes, ensuring the adsorption heads firmly adhere to the surface of the automotive trim. Furthermore, the adsorption heads deform synchronously with the bending plate, ensuring a tight fit between the trim and the bending plate throughout the bending process, eliminating shape errors caused by workpiece shifting or warping during bending. A flexible connector links the mounting frame to the end of the bending plate, helping to maintain the bending shape and further suppressing springback. When heating stops and the temperature drops below the phase change temperature, the bending plate automatically returns to a straight state, facilitating workpiece placement and equipment reset. This invention, through its adsorption structure design, overcomes the technical limitations of poor fit and shape control in bending components, ensuring a tight fit between the trim and the bending plate throughout the bending process and preventing shape errors caused by workpiece shifting or warping during bending.

[0028] 4. This invention utilizes a specially designed suction head system. Thirty suction heads are precisely positioned at the seams of the bending plate's panels. The concave spherical grooves at the front end, combined with the spiral protrusions on the inner wall, create a centrally converging negative pressure field when the micro-vacuum pump draws air, significantly enhancing the suction force. This ensures a tight fit between the decorative strip and the bending plate throughout the bending process, preventing the workpiece from falling off or shifting during bending. Simultaneously, ten equidistantly arranged inclined protrusions at the front end of the suction heads effectively increase the frictional resistance with the surface of the decorative strip. As the bending plate bends with the shape memory alloy phase transformation, these protrusions precisely guide the decorative strip to deform synchronously, avoiding bending shape deviations caused by localized stress concentration and ensuring the consistency of the inverted U-shaped bend. After the decorative strip is fixed in the middle, the micro-vacuum pump is activated, and the suction heads guide the decorative strip to adhere through enhanced negative pressure and the protrusions. This invention, through the design of the suction heads, improves the suction and guiding force on the bending plate, ensuring a tight fit between the decorative strip and the bending plate throughout the bending process and preventing the workpiece from falling off or shifting during bending.

[0029] 5. This invention utilizes a clamping structure design. Through a connecting pipe and a vacuum pump, negative pressure is created to precisely adsorb the clipping blocks generated during milling. The clipping blocks bend upwards, forming an L-shaped angle with the bright trim panel. This design prevents the clipping blocks from falling and obstructing the milling tool due to gravity, while also proactively reserving sufficient milling space. It also prevents damage or displacement of the clipping blocks, balancing obstacle avoidance and workpiece protection. The bending assembly and clamping structure are depth-fitted. Two sets of symmetrical bending plates drive the two ends of the bright trim strip to bend downwards, making the entire strip form an inverted U-shape at the clamping point, precisely exposing the area to be processed at the bend. The V-shaped adsorption obstacle avoidance design of the clamping structure further clears clipping block obstacles in the milling path. Together, they form a dual spatial guarantee of "macroscopic exposure + microscopic obstacle avoidance," allowing the milling tool to smoothly extend into the machining area without secondary adjustments. This invention achieves stable clamping of the bright trim strip's center through the clamping structure design, and solves the problem of interference caused by clipping blocks falling due to gravity through V-shaped flip adsorption. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the clamping component and bending component of the present invention.

[0032] Figure 3 This is a schematic diagram of the clamping structure of the present invention.

[0033] Figure 4 This is a cross-sectional view of the clamping structure of the present invention.

[0034] Figure 5 This is a schematic diagram of the structure of the present invention when the clamping structure causes the car bright trim panel clip block to deform.

[0035] Figure 6This is a schematic diagram of the bending component of the present invention.

[0036] Figure 7 This is a cross-sectional view of the bending assembly of the present invention.

[0037] Figure 8 This is a schematic diagram of the adsorption head of the adsorption tube of the present invention.

[0038] Figure 9 This is a schematic diagram of the structure of the automotive bright trim panel of the present invention.

[0039] Figure 10 This is a schematic diagram of the structure of the automotive bright trim panel of the present invention during bending.

[0040] Figure 11 This is a cross-sectional structural diagram of the automotive bright trim panel of the present invention.

[0041] Explanation of the labels in the diagram:

[0042] 1. Clamping assembly; 2. Bending assembly; 3. Milling assembly; 4. Lifting bracket;

[0043] 101. Clamping post; 102. Pressing structure; 1021. Pressing frame; 1022. Pressing plate; 1023. Tilting drive unit

[0044] 1024. Connecting pipe; 1025. Vacuum pump;

[0045] 201. Bending plate; 202. Mounting frame; 203. Flexible connector; 204. Temperature control unit; 205. Heat exchange flexible belt; 206. Adsorption structure;

[0046] 2061. Mounting block; 2062. Adsorption tube; 2063. Miniature vacuum pump; 2064. Adsorption head; 2065. Spiral protrusion; 2066. Inclined protrusion;

[0047] 301. First linear drive unit; 302. Second linear drive unit; 303. Milling unit. Detailed Implementation

[0048] Example 1, as Figures 1 to 11As shown, the present invention relates to a multi-station automatic milling equipment for automotive bright trim strips, comprising a clamping assembly 1, a bending assembly 2, and a milling assembly 3 mounted on a work platform; the clamping assembly 1 includes a clamping post 101 and a pressing structure 102, which are used to fix the middle part of the automotive bright trim strip, facilitating subsequent bending operations; the bending assembly 2 includes a bending plate 201, which is used to bend the automotive bright trim strip, exposing the part to be processed at the bend, allowing the cutter of the milling assembly 3 to extend into the part to be processed; when the two sets of bending plates 201 symmetrically arranged on both sides of the automotive bright trim strip are in a bending state, the two ends of the automotive bright trim strip are downward and the whole is in an inverted U-shaped bend at the clamping assembly 1.

[0049] Two sets of milling components 3 are symmetrically arranged on the outside of the work platform. The milling components 3 include a first linear drive unit 301, a second linear drive unit 302 and a milling unit 303. The second linear drive unit 302 is installed at the output end of the first linear drive unit 301 and the milling unit 303 is installed at the output end of the second linear drive unit 302.

[0050] Two sets of lifting brackets 4 are also installed on both sides of the work platform. Before the bending plate 201 is bent, the lifting brackets 4 are lowered from the horizontal plane to leave bending space for the bending of the car bright trim plate.

[0051] This invention integrates clamping component 1, bending component 2, and milling component 3 on the work platform through the design of clamping component 1 and bending component 2, and constructs a "one-time clamping-bending exposure-interference-free milling" automotive bright trim processing system. This solves the problem of severe occlusion when processing the curved part of the bright trim, greatly improves the processing accuracy and production efficiency of the curved part of the automotive bright trim, and perfectly meets the batch processing needs of automotive bright trim.

[0052] The clamping assembly 1, through the cooperation of the clamping column 101 and the pressing structure 102, firmly fixes the central area of ​​the automotive bright trim strip, providing a stable positioning reference for subsequent bending and milling operations, and avoiding workpiece displacement during processing. The bending assembly 2 uses two sets of symmetrically arranged bending plates 201 to drive the two ends of the bright trim strip to bend downwards, so that the whole strip is in an inverted U-shaped bend at the clamping assembly 1. This design can accurately expose the part to be processed at the bend of the bright trim strip, providing sufficient operating space for the cutting tool of the milling assembly 3 to extend, and eliminating the blind spot caused by the part to be processed being obscured. The milling assembly 3 can directly and accurately mill the exposed part to be processed without secondary clamping and adjustment, thus avoiding the positioning error caused by multiple clamping from the root.

[0053] This invention, through the design of the clamping component 1 and the bending component 2, and by using the inverted U-shaped bending shape, overcomes the technical limitation that the part to be processed is difficult to expose in traditional processing.

[0054] Specifically, such as Figures 3 to 5 As shown, the clamping structure 102 of the present invention includes a clamping frame 1021, a clamping plate 1022, a flipping drive unit 1023, a connecting pipe 1024, and a vacuum pump 1025; two sets of clamping plates 1022 are respectively movably connected to both sides of the clamping frame 1021, two flipping drive units 1023 are installed inside the clamping frame 1021, and the two flipping drive units 1023 are drivenly connected to the two sets of clamping plates 1022, two sets of connecting pipes 1024 are respectively connected to the two sets of clamping plates 1022, and the vacuum pump 1025 is connected to the two sets of connecting pipes 1024, and the vacuum pump 1025 is installed on the clamping frame 1021.

[0055] When the two flipping drive units 1023 drive the two sets of clamping plates 1022 to flip, the two sets of clamping plates 1022 are in a V-shaped tilt state. The clamping plates 1022 adsorb the suspended buckle block left after the bottom of the bright trim section of the car through the connecting pipe 1024 and the vacuum pump 1025, so that the buckle block bends upward and forms an L-shaped angle with the bright trim, leaving milling space and preventing it from falling due to gravity and blocking the tool of the milling assembly 3.

[0056] This invention refines the function of the clamping structure 102 of the clamping component 1 through the design of the clamping structure 102, and solves the problem that the upper buckle block falls and blocks the tool due to the lack of support at the bottom after milling the bottom part during processing. It greatly improves the continuity, accuracy and efficiency of bright trim processing, and perfectly adapts to the batch precision processing needs of automotive bright trim with buckle structure.

[0057] The present invention uses a connecting pipe 1024 and a vacuum pump 1025 to form a negative pressure adsorption, which precisely adsorbs the buckle block generated during milling, causing the buckle block to bend upward and form an L-shaped angle with the bright decorative panel. This design not only prevents the buckle block from falling and blocking the milling tool due to gravity, but also actively reserves sufficient milling space, while preventing damage or displacement of the buckle block, thus taking into account both obstacle avoidance and workpiece protection.

[0058] The bending component 2 is deeply matched with the clamping structure 102. Two sets of symmetrical bending plates 201 drive the two ends of the bright trim strip to bend downwards, so that the whole strip is in an inverted U-shape at the clamping point, accurately exposing the part to be processed at the bend. The V-shaped adsorption and obstacle avoidance design of the clamping structure 102 further clears the clipping block obstacles on the milling path. The two form a dual space guarantee of "macro exposure + micro obstacle avoidance", allowing the milling component 3 tool to smoothly extend into the machining without secondary adjustment.

[0059] During operation, the bending component 2 drives the bright trim strip to bend in an inverted U-shape, exposing the part to be processed; the milling component 3 precisely mills the exposed area, and the flipping drive unit 1023 drives the clamping plate 1022 to flip and fit the middle of the bright trim strip. The vacuum pump 1025 starts and adsorbs the buckle block through the connecting pipe 1024, so that the buckle block remains attached to the clamping plate 1022 as the lower support gradually disappears during the milling process. As the stroke of the milling head reaches a certain position, the external sensor or control system operates the flipping drive unit 1023 to work, and the clamping plate 1022 bends the suspended buckle block into an L-shaped angle, exposing the part to be processed again for milling. The buckle block is adsorbed and fixed throughout the process, with no risk of falling and obstruction, and no need for multiple clamping, thus avoiding positioning deviation from the root.

[0060] The present invention achieves stable clamping of the bright trim strip in the middle through the design of the clamping structure 102, and solves the problem of interference caused by the buckle block falling due to gravity through V-shaped flip adsorption.

[0061] It is worth noting that, such as Figures 6 to 7 As shown, the bending plate 201 of the present invention is made of an electrically heated shape memory alloy. When the bending plate 201 is in a heated state, the bending plate 201 is in a bent state to form a bent workpiece. When the bending plate 201 is in a cooled state, the bending plate 201 is in a straight state.

[0062] The phase transition temperature of the electrically heated shape memory alloy is 50-70℃. By reducing the phase transition temperature, the electric heating shape memory alloy reduces the hardness and modulus of the rubber, thereby reducing the bending force and enabling the bending of automotive bright trim strips.

[0063] The bending assembly 2 also includes a mounting frame 202, a flexible connector 203, a temperature control unit 204, and a heat exchange flexible belt 205; one end of the bending plate 201 is mounted on the mounting frame 202, one end of the flexible connector 203 is connected to the mounting frame 202, and the other end of the flexible connector 203 is connected to the other end of the bending plate 201, the temperature control unit 204 is mounted inside the mounting frame 202, and the heat exchange flexible belt 205 is coiled around the bending plate 201 and connected to the temperature control unit 204.

[0064] This invention refines the temperature control drive structure of the bending component 2 through the design of the bending plate 201, solving the problems of excessive external force causing damage to the workpiece, uncontrollable bending shape, and springback deformation after cooling in traditional bending equipment. It significantly improves the accuracy, stability, and workpiece yield of bright trim bending processing, perfectly meeting the batch precision processing needs of automotive bright trim with rubber composite layer.

[0065] The bending assembly 2 of this invention uses an electrically heated shape memory alloy bending plate 201, which, along with a mounting frame 202, a flexible connector 203, a temperature control unit 204, and a heat exchange flexible belt 205, forms a temperature control drive system. The phase change temperature of the shape memory alloy is precisely set to 50-70℃. The temperature control unit 204 uniformly heats the plate by winding the heat exchange flexible belt 205 around the bending plate 201. When the temperature reaches the phase change threshold, the bending plate 201 automatically deforms and bends, driving the automotive trim strip to bend synchronously into an inverted U-shape, precisely exposing the part to be processed at the bend. Crucially, the low-temperature heating range of 50-70℃ can simultaneously reduce the hardness and modulus of the rubber layer on the surface of the trim strip, significantly reducing the external force required for bending and preventing tearing of the rubber layer or deformation of the substrate. The flexible connector 203 connects the mounting frame 202 and the end of the bending plate 201, helping to maintain the bending shape of the bending plate 201 and preventing deformation rebound. When heating stops and the temperature drops below the phase change temperature, the bending plate 201 automatically returns to a straight state, which facilitates the picking up and putting down of workpieces and can adapt to the needs of different processing cycles.

[0066] During operation, the bright trim strip is fixed in the middle by the clamping component 1, and the buckle block is attracted to avoid obstacles; the temperature control unit 204 is activated, and the heat exchange soft belt 205 heats the shape memory alloy bending plate 201 to 50-70℃. The bending plate 201 bends and drives the bright trim strip into an inverted U-shape, and the low temperature simultaneously softens the rubber layer to reduce bending damage; the milling component 3 precisely mills the exposed part to be processed; after processing is completed, the temperature control unit 204 stops working, the bending plate 201 cools down and returns to straightness, the pressure structure 102 is depressurized, and the finished product is taken out.

[0067] This invention, through the design of the bending plate 201, overcomes the technical limitations of traditional mechanical bending, which involves large external forces and easy damage, and significantly improves the accuracy, stability, and workpiece yield of bright trim bending processing.

[0068] Furthermore, such as Figure 7 As shown, the bending assembly 2 of the present invention also includes an adsorption structure 206, which includes mounting blocks 2061, adsorption tubes 2062, and a micro vacuum pump 2063. Thirty mounting blocks 2061 are equidistantly mounted on the bending plate 201, and thirty adsorption heads 2064 of the adsorption tubes 2062 are respectively connected to several mounting blocks 2061. The bending plate 201 is divided into four parallel plates, and the thirty adsorption heads 2064 are respectively located in the gaps of the four plates. The micro vacuum pump 2063 is connected to the adsorption tubes 2062 and is mounted on the mounting frame 202. The thirty adsorption heads 2064 are used to adsorb the automotive trim panel and bend together with the bending plate 201.

[0069] This invention solves the problems of poor adhesion between the bright trim strip and the bending plate 201, inconsistent bending shape, springback deformation, and processing offset by the design of the adsorption structure 206. It greatly improves the accuracy, stability and workpiece yield of the bending process of the bright trim strip, and perfectly meets the batch precision processing needs of automotive bright trim strips with rubber composite layer.

[0070] The innovation of the bending component 2 in this invention lies in the dual synergy of shape memory alloy temperature-controlled bending and the plate adsorption structure 206: the bending plate 201 is made of electrically heated shape memory alloy and is divided into four parallel plates, with its phase change temperature precisely set at 50-70℃. The heating unit uniformly heats the bending plate 201 through a heat exchange soft belt. When the phase change temperature is reached, the bending plate 201 automatically bends, simultaneously reducing the hardness and modulus of the rubber layer on the bright trim surface, significantly reducing the bending force to avoid tearing of the rubber layer; thirty mounting blocks 2061 are equidistantly arranged on the bending plate 201, and the adsorption tube 2... The adsorption heads 2064 of the 062 are precisely positioned at the gaps between the four plates. The micro vacuum pump 2063 provides negative pressure through the adsorption tube 2062, allowing the adsorption heads 2064 to firmly adhere to the surface of the automotive trim. The adsorption heads 2064 can deform synchronously with the bending plate 201, ensuring a tight fit between the trim and the bending plate 201 throughout the bending process, eliminating shape errors caused by workpiece misalignment or warping during bending. The flexible connector 203 connects the mounting frame 202 to the end of the bending plate 201, helping to maintain the bending shape of the bending plate 201 and further suppressing springback. When heating stops and the temperature drops below the phase change temperature, the bending plate 201 automatically returns to a straight state, facilitating workpiece placement and equipment reset.

[0071] During operation, the bright trim strip is fixed in the middle by the clamping component 1, and the buckle block is adsorbed to avoid obstacles; the micro vacuum pump 2063 is started, and the adsorption head 2064 is attached to the surface of the bright trim strip; the heating unit drives the bending plate 201 to heat up to the phase change temperature and bends, causing the bright trim strip to bend synchronously into an inverted U shape; the milling component 3 precisely mills the exposed part to be processed; after processing is completed, the heating unit stops working, the bending plate 201 cools and straightens, the adsorption structure 206 and the clamping structure release pressure synchronously, and the finished product is taken out.

[0072] The present invention overcomes the technical limitations of poor adhesion and shape control of bent parts by designing the adsorption structure 206, ensuring that the bright trim strip and the bending plate 201 are tightly adhered throughout the process, and preventing shape errors caused by workpiece displacement and warping during the bending process.

[0073] Furthermore, such as Figure 8As shown, the front end of the adsorption head 2064 of the present invention is provided with a concave spherical groove, and a spiral protrusion 2065 is provided on the inner wall of the spherical groove. The spiral protrusion 2065 is used to make the airflow form a centrally converging negative pressure field to increase the adsorption force when the adsorption head 2064 draws in air. Ten inclined protrusions 2066 are provided in an equidistant ring at the front end of the adsorption head 2064. The inclined protrusions 2066 are used to increase the resistance between the adsorption head 2064 and the car bright trim panel, so that the adsorption head 2064 can better guide the bending of the car bright trim panel.

[0074] This invention solves the problems of insufficient adsorption force and misalignment of bright trim strips through the design of the adsorption head 2064, which greatly improves the accuracy, stability and workpiece yield of the bending process of bright trim strips, and perfectly meets the batch precision processing needs of automotive bright trim strips with rubber composite layers.

[0075] Thirty adsorption heads 2064 are precisely arranged at the gaps between the bending plate 201. The concave spherical grooves at their front ends, together with the spiral protrusions 2065 on the inner wall, can form a centrally converging negative pressure field when the micro vacuum pump 2063 draws air, which greatly enhances the adsorption force and ensures that the bright trim strip is tightly attached to the bending plate 201 throughout the process, preventing the workpiece from falling off or shifting during the bending process. At the same time, the ten inclined protrusions 2066, which are equidistantly arranged in a ring at the front end of the adsorption head 2064, can effectively increase the frictional resistance with the surface of the bright trim strip. When the bending plate 201 bends with the shape memory alloy phase transformation, it can precisely guide the bright trim strip to deform synchronously, avoid the bending shape deviation caused by local stress concentration, and ensure the consistency of the inverted U-shaped bend.

[0076] After the bright trim strip is fixed in the middle, the micro vacuum pump 2063 is started, and the adsorption head 2064 guides the bright trim strip to adhere by strengthening the negative pressure and the protrusion.

[0077] The present invention improves the adsorption and guiding force on the bending plate 201 through the design of the adsorption head 2064, ensuring that the bright trim strip is in close contact with the bending plate 201 throughout the process, and preventing the workpiece from falling off or shifting during the bending process.

[0078] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A multi-station automatic milling machine for automotive bright trim strips, characterized in that, Includes a clamping assembly (1), a bending assembly (2), and a milling assembly (3) mounted on a work platform; The clamping assembly (1) includes a clamping post (101) and a pressing structure (102). The clamping post (101) and the pressing structure (102) are used to fix the middle part of the automotive bright trim strip, which facilitates subsequent bending work. The bending assembly (2) includes a bending plate (201) for bending the automotive bright trim strip so that the part to be processed at the bent part of the automotive bright trim strip is exposed, allowing the cutting tool of the milling assembly (3) to extend into the part to be processed. When the two sets of bending plates (201) symmetrically arranged on both sides of the automotive bright trim strip are in a bent state, the two ends of the automotive bright trim strip are downward and the whole is in an inverted U-shaped bent state at the clamping assembly (1). The clamping structure (102) includes a clamping frame (1021), a clamping plate (1022), a flipping drive unit (1023), a connecting pipe (1024), and a vacuum pump (1025). Two sets of clamping plates (1022) are movably connected to both sides of the clamping frame (1021). Several flipping drive units (1023) are installed inside the clamping frame (1021), and the several flipping drive units (1023) are driven connected to the two sets of clamping plates (1022). Two sets of connecting pipes (1024) are connected to the two sets of clamping plates (1022), and a vacuum pump (1025) is connected to the two sets of connecting pipes (1024). The vacuum pump (1025) is installed on the clamping frame (1021). When the flipping drive units (1023) drive the two sets of pressure plates (1022) to flip, the two sets of pressure plates (1022) are in a V-shaped tilt state. The pressure plates (1022) adsorb the suspended buckle block left after the bottom of the milled part of the bright trim strip through the connecting pipe (1024) and the vacuum pump (1025), so that the buckle block bends upward and forms an L-shaped angle with the bright trim strip.

2. The multi-station automatic milling equipment for automotive bright trim strips according to claim 1, characterized in that, The bending plate (201) is made of an electrically heated shape memory alloy. When the bending plate (201) is in a heated state, it is bent to form a bent workpiece. When the bending plate (201) is in a cooled state, it is straight.

3. The multi-station automatic milling equipment for automotive bright trim strips according to claim 2, characterized in that, The phase transition temperature of the electrothermal memory alloy is 50-70℃. The electrothermal memory alloy reduces the hardness and modulus of the rubber through the phase transition temperature, thereby reducing the bending force and enabling the automotive bright trim strip to be bent.

4. The multi-station automatic milling equipment for automotive bright trim strips according to claim 3, characterized in that, The bending assembly (2) also includes a mounting frame (202), a flexible connector (203), a temperature control unit (204), and a heat exchange flexible belt (205); One end of the bending plate (201) is mounted on the mounting frame (202), one end of the flexible connector (203) is connected to the mounting frame (202), and the other end of the flexible connector (203) is connected to the other end of the bending plate (201). The temperature control unit (204) is mounted inside the mounting frame (202). The heat exchange soft strip (205) is coiled around the bending plate (201), and the heat exchange soft strip (205) is connected to the temperature control unit (204).

5. The multi-station automatic milling equipment for automotive bright trim strips according to claim 4, characterized in that, The bending assembly (2) also includes an adsorption structure (206), which includes a mounting block (2061), an adsorption tube (2062), and a micro vacuum pump (2063). Several mounting blocks (2061) are equidistantly mounted on the bending plate (201). Several adsorption heads (2064) of the adsorption tube (2062) are respectively connected to several mounting blocks (2061). The bending plate (201) is divided into several parallel plates, and several adsorption heads (2064) are respectively located in the gaps of several plates. The micro vacuum pump (2063) is connected to the adsorption tube (2062) and is mounted on the mounting frame (202). Several adsorption heads (2064) are used to adsorb the automotive bright trim panel and bend together with the bending plate (201).

6. The multi-station automatic milling equipment for automotive bright trim strips according to claim 5, characterized in that, The front end of the adsorption head (2064) is provided with a concave spherical groove, and the inner wall of the spherical groove is provided with a spiral protrusion (2065). The spiral protrusion (2065) is used to make the airflow form a central converging negative pressure field to increase the adsorption force when the adsorption head (2064) draws in air. The front end of the adsorption head (2064) is provided with a number of inclined protrusions (2066) at equal intervals. The inclined protrusions (2066) are used to increase the resistance between the adsorption head (2064) and the car bright trim panel, so that the adsorption head (2064) can better guide the bending of the car bright trim panel.

7. The multi-station automatic milling equipment for automotive bright trim strips according to claim 6, characterized in that, The work platform is also symmetrically arranged with two sets of milling components (3), the milling components (3) including a first linear drive unit (301), a second linear drive unit (302) and a milling unit (303). The second linear drive unit (302) is installed at the output end of the first linear drive unit (301), and the milling unit (303) is installed at the output end of the second linear drive unit (302).

8. The multi-station automatic milling equipment for automotive bright trim strips according to claim 1, characterized in that, Two sets of lifting brackets (4) are also installed on both sides of the work platform. Before the bending plate (201) is bent, the lifting brackets (4) are lowered from the horizontal plane to leave bending space for the bending of the car bright trim plate.

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