A high-stability paint-free curved cabinet door processing technology and cabinet door

Abstract

The present invention relates to a high-stability paint-free curved cabinet door processing technology and cabinet door thereof, comprising the following steps: step 1, preparing a wooden mold according to the size requirements of the curved cabinet door; step 2, hot pressing melamine impregnated paper onto a thin medium-density fiberboard to form a surface material layer; step 3, reserving a processing allowance for 2-8 mm corkboard, 2-6 mm multilayer board and the surface material layer in step 2 according to the finished product size requirements, and cutting the base material and the surface material according to the processing allowance parameters; step 4, fixing the wooden mold in step 1 on a press, spraying an impregnated paper softener ratio liquid on the melamine impregnated paper, and further single-sidedly gluing the corkboard, multilayer board and surface material layer cut in step 3 in a symmetrical order of the internal structure of the curved board. The present invention breaks through the process barrier that arc plates are difficult to achieve paint-free finishing, greatly improves the deformation problem of arc plates, and the obtained arc cabinet door panels are not easy to deform or break.

Description

Technical field:

[0001] The invention belongs to the technical field of furniture manufacturing, and particularly relates to a high-stability paint-free curved cabinet door processing technology and the cabinet door. Background technology:

[0002] Arc-shaped panels combine practicality and decorative qualities, meeting the design requirements of various corner areas in a home. Their unique design effectively mitigates the sharpness of a space, creating a warm, safe, and comfortable atmosphere in the home. Therefore, they are widely used in various architectural and interior decoration applications.

[0003] Currently, curved panels on the market are primarily painted, often using a process that destroys the flat plate structure to achieve the curvature. This is costly, inefficient, and prone to problems such as springback and breakage. Due to structural limitations and conventional processing techniques, paint-free curved panels are difficult to manufacture, and even more difficult to apply to existing whole-home customization models. Consequently, they are rarely used in large-scale custom cabinet products such as wardrobes and other wardrobes.

[0004] In the existing technology, the following three methods are mostly used to make curved panels for furniture: steam bending, notch bending, and high-frequency hot press bending. Steam bending: The wood is softened by steaming, and then the softened wood is pressurized and bent into shape using a mold or steel belt. Figure 5 As shown, this method is time-consuming, costly, and prone to deformation such as springback; Notch bending process: It is also a common method for making curved shapes of artificial boards. By milling grooves on one side of the board, the board can be bent. The larger the width of the board, the more difficult it is to process, and the board is prone to breakage; High-frequency hot pressing bending process: A high-frequency or microwave low-temperature molding machine is used to bend the board. This process is highly dependent on equipment, has high requirements for mold making, is time-consuming, and costly. Due to instantaneous hot pressing, water molecules move in the board in an unbalanced manner, and internal stress accumulates locally, which can easily cause the curved board to deform. Summary of the invention:

[0005] The technical problem to be solved by the present invention is to provide a high-stability paint-free curved cabinet door processing technology and its cabinet door. The cabinet door breaks through the process barrier of achieving paint-free finish on arc plates, greatly improving the deformation problem of arc plates. At the same time, the process of the present invention can also be applied to the fields of paint-finished cabinet door panels and wall panels, extending the application range of arc plates.

[0006] The technical solution of the present invention is to provide a high-stability paint-free curved cabinet door processing process, including the following steps:

[0007] Step 1: Prepare a wooden mold according to the size requirements of the curved cabinet door. The wooden mold includes an upper mold and a lower mold. The lower mold has a concave cavity, and the arc inner wall of the concave cavity is adapted to the arc of the curved cabinet door to be processed;

[0008] Step 2: hot pressing the melamine impregnated paper onto the thin medium-density fiberboard to form a surface material layer;

[0009] Step 3: Cut the 2-8mm cork board, 2-6mm multilayer board and the surface material layer in step 2 according to the finished product size requirements, leaving processing allowances, and cutting the base material and surface material according to the processing allowance parameters;

[0010] Step 4: Fix the wooden mold in step 1 on a press, spray a softener mixture for impregnated paper on the melamine-impregnated paper, further apply glue on one side of the corkboard, multilayer board, and surface material layer cut in step 3 according to the symmetrical order of the internal structure of the arc board, and stack them in the arc-shaped concave cavity of the lower mold of the wooden mold, wherein the softener mixture for impregnated paper is prepared by diluting the softener for impregnated paper with tap water or industrial alcohol at a ratio of 1:5-30, and the softener mixture for impregnated paper comprises the following components in parts by weight: 2-3 parts of fatty alcohol polyoxyethylene ether, 1-2 parts of trihydroxymethylpropane, 1-2 parts of sodium chloride, 2-3 parts of sodium lauryl sulfate, and 3-4 parts of deionized water; a penetrant is sprayed on the surface of the melamine-impregnated paper for softening, effectively solving a series of problems such as the melamine-impregnated paper being brittle after being heated and pressed onto the balancing layer, being prone to cracking when bent, and being prone to edge bursting when cutting;

[0011] Step 5: Slowly lower the upper mold fixed on the press in step 4 with a fixed pressure, and control the sinking speed at 5-20 cm / min until the laminated plates stacked on the lower mold in step 4 are pressed tightly. After the glue is cured, the mold can be removed and the pressed curved plate rough material can be taken out;

[0012] Step 6: In step 5, a small amount of impregnated paper softener liquid is sprayed on the curved plate rough material where it needs to be cut, and further refined according to the drawing, and edge-sealed around it;

[0013] Step 7: Punch hinge holes on the curved plate after edge banding in step 6 to obtain the required curved cabinet door panel.

[0014] The curved cabinet door of the present invention is formed by gluing layers of cork together and applying pressure using a multifunctional wooden curved mold, and then processed through processes such as fine trimming, edge sealing, and punching. Impregnated paper has the characteristic of becoming brittle after heating, and is very likely to break after being bent. As an innovation of the present invention, the preferred impregnated paper softener ratio liquid of the present invention can improve the brittleness of the impregnated paper and increase its elasticity after spraying, which can solve the problem of bending and breaking of the impregnated paper; at the same time, during fine trimming, the impregnated paper softener ratio liquid is sprayed a second time at the area requiring fine trimming, which can also increase the softness of the impregnated paper and prevent the problem of edge bursting during cutting. After the melamine impregnated paper is pasted on the medium-density fiberboard in the balancing layer, its moisture evaporates rapidly due to the effect of high temperature, and the moisture content decreases, resulting in increased brittleness of the paper. The impregnated paper softener can dissolve and swell the polymer particles in the impregnated paper after the brittleness increases, thereby increasing its plasticity. As another innovation, cork board is used as the base material. The cork is composed of two layers of poplar veneer sandwiched with a layer of pear wood veneer, and the textures are staggered and pressed together. The pear wood veneer has the characteristics of dense wood and high toughness. When the cork is bent, it provides it with lateral tension, effectively preventing the board from breaking when bending, and further improving the deformation resistance of the curved board.

[0015] Preferably, the wooden mold in step 1 is made by splicing unit molds and processed in the following way:

[0016] Step 1: Draw the required upper and lower template shapes according to the drawing size requirements of the curved cabinet door panel to be processed, convert the above processing parameters into CNC engraving files, and use the CNC machining center to engrave the mold shape on the panel. The number of templates is determined by the required size of the drawing. For every 300mm increase in the length of the curved cabinet door panel, an additional set of upper and lower milling templates is required;

[0017] Step 2: Cut out several 100mm*300mm wooden strips to connect the formwork;

[0018] Step 3: Connect the template in step 1 with the wooden strips in step 2 to form a unit mold. The gap between the wooden strips is 10mm and the spacing is consistent to ensure that the pressure at each point of the curved plate is consistent when pressure is applied later;

[0019] Step 4: Connect the unit molds in step 3 to form a mold prototype, and reinforce the back of the mold prototype with a connecting board to prepare a wooden mold.

[0020] In whole-house customization orders, drawings need to be drawn according to customer needs and actual conditions. Most of them are non-standard sizes. The arc size of the curved door panel can be calibrated, but its height mostly varies. The unitized splicing mold can meet the pressing of curved panels of different heights. Each two sets of templates are connected with 100mm*300mm wooden strips to form a unit mold with a length of about 336mm. The templates on both sides of the unit mold are 18mm thick, and the length of the strip connected between the two templates is 300mm. 18+18+300=336mm. The number of unit molds is selected for splicing according to the length of the curved door panel. The use of the assembled wooden mold of the present invention can meet the preparation of curved panels of different length specifications, ensuring that when the glue is pressurized and cured, the pressure at each point of the board is uniform, and the surface is flat and smooth.

[0021] Preferably, in step 3, the 4.0-5.0 mm thick cork board, the 3.0-4.0 mm thick multilayer board, and the surface material layer from step 2 are cut according to the processing allowance parameters, with a processing allowance reserved according to the finished product size requirements. A thin multilayer board is used as the middle layer of the substrate to ensure symmetry between the upper and lower structures of the substrate.

[0022] Preferably, in step 2, the thin medium-density fiberboard has a thickness of 1.5 to 4 mm and is hot-pressed at a pressure of 12 to 15 MPa, a temperature of 195 to 215°C, and a time of 14 to 25 seconds. This thin thickness effectively avoids appearance defects caused by substrate defects, and because the wood is relatively soft, it can be effectively bent to achieve the desired curvature.

[0023] Preferably, in step 3, the cork raw material is selected from poplar and pear veneer, two layers of poplar veneer are sandwiched between a layer of pear veneer, and the texture is staggered horizontally and vertically, and a processing allowance of 30-50mm is reserved. The base material is preferably cork, and the curved plate is integrated by the layer-by-layer lamination process. The base material increases the pear veneer layer to provide lateral traction, which effectively improves the deformation and rebound problem of the curved plate. Among them, the pear veneer has the characteristics of dense wood and high toughness. When the cork board is bent, it provides lateral tension, effectively preventing the plate from breaking when bent, and further improves the deformation resistance of the curved plate. The pear veneer has the characteristics of dense wood and high toughness, and the texture is perpendicular to the poplar texture, which can give the poplar veneer lateral tension to prevent the plate from breaking when bent.

[0024] Preferably, in step 4, the glue used is a modified EVA emulsion, with a single-sided adhesive application between layers at a rate of 300-350g / m². The process takes less than 30 minutes. This single-sided adhesive application effectively controls the adhesive application to meet process requirements, prevents excess adhesive, and maintains the moisture content of the board. A moisture content that is too high or too low can easily cause deformation; a moisture content of 10%-15% is ideal.

[0025] Preferably, step 5 includes two processes: cold pressing and hot pressing. During cold pressing, the pressure is 1-2 MPa, and the cold pressing time depends on the ambient temperature, which is 6-8 hours in summer and 10-12 hours in winter. During hot pressing, the pressure is 10-13 MPa, and the hot pressing time is 15-20 minutes.

[0026] Preferably, in step 6, the two straight edges are banded with a linear edge banding machine, and the two arc edges are banded manually, wherein manual edge banding refers to applying edge banding glue on a PVC edge banding strip of the same color as the panel, heating the edge banding strip with a handheld hot air blower to soften it, and bonding it to the arc edges at both ends, using a flattening tool to fit the edge banding strip tightly to the panel, and then using a utility knife to fine-tune the chamfering of the edge banding strip.

[0027] Furthermore, in step 7, the hinge hole punching device uses a woodworking hinge drill.

[0028] The present invention also provides a curved cabinet door manufactured using the above-described high-stability paint-free curved cabinet door processing process. This curved cabinet door effectively prevents the board from breaking during bending, improving the curved board's resistance to deformation. It also addresses the difficulty of traditional impregnated paper becoming brittle and difficult to plasticize after hot pressing, effectively preventing the impregnated paper from breaking during bending and effectively reducing the problem of edge cracking during fine cutting of the curved board.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The present invention meets the surging demand for various melamine-faced products on the market, realizes the mass production of melamine-faced arc-shaped artificial boards, breaks the process barriers of paint-free arc boards, and meets the market demand for paint-free arc boards.

[0031] This invention meets the home improvement market's demand for customized diversification, practicality, and aesthetics. The paint-free arc panels come in a variety of colors and can be customized to suit different decorating styles. The use of arc-shaped door panels and wall guards increases storage space for cabinets and provides greater security, meeting the personalized customization needs of different families. Description of the drawings:

[0032] Figure 1 Schematic diagram of the process flow of the present invention

[0033] Figure 2 This is a schematic diagram of a wooden mold that can be spliced together;

[0034] Figure 3 Schematic diagram of the patented high-stability melamine-impregnated paper-faced curved cabinet door structure

[0035] Figure 4 This is a schematic diagram of the size change of the product of the present invention;

[0036] Figure 5 Schematic diagram of the existing processing technology for curved decorative panels. Specific implementation method:

[0037] The present invention will be further described below with reference to the accompanying drawings:

[0038] like Figure 1-3 As shown in the figure, a high-stability paint-free curved cabinet door processing technology, the specific processing steps are as follows:

[0039] Step 1: Draw the upper and lower template shapes of the required wooden mold according to the drawing size requirements of the curved cabinet door panel. Convert the above processing parameters into CNC engraving files, and use the CNC machining center to carve the template shape on the panel. The number of templates depends on the required size of the drawing. For every 300mm increase in the length of the curved cabinet door panel, an additional set of upper and lower milling templates is required.

[0040] Step 2: Cut out several 100mm*300mm wooden strips to connect the formwork;

[0041] Step 3: Connect the template in step 1 with the wooden strips 5 in step 2 to form a unit mold. Several wooden strips 5 are evenly spaced in the unit mold to form the main part of the arc-shaped cavity. The gap between the wooden strips 5 is 10 mm, and the spacing is consistent, so as to ensure that when pressure is applied later, all points of the arc plate are under uniform pressure.

[0042] Specifically, before assembling the unit mold, positioning lines need to be drawn on the template to mark the installation position of the wooden strips 5, and then the two ends of the wooden strips 5 are used to connect the template front and back, thereby obtaining a 336mm long unit mold;

[0043] Step 4: Connect the unit molds in step 3 to form a mold prototype, and reinforce the back of the mold prototype with a connecting board to prepare the final wooden mold;

[0044] Assuming the length of the curved panel is 2400mm, 8 sets of unit molds are required for assembly. The assembled unit mold can meet the preparation of curved panels of different length specifications, ensuring that when the glue is cured and pressure is applied, the pressure at each point of the panel is uniform, ensuring the surface flatness of the panel. The advantage of the spliced mold is that the mold length can be adjusted arbitrarily. The more the mold length is adapted to the product height, the closer the pressure at each point will be when the product is under pressure. The curvature will also be more accurate after demoulding and will not rebound easily. The traditional mold is set according to the length of the curved door panel. When the press is hot pressed, it is easy to cause uneven pressure at each stress point on the panel surface, resulting in deviations in the curvature of different parts. In addition, a corresponding mold needs to be remade each time a curved panel of different length is processed.

[0045] Step 5: Hot-press the melamine-impregnated paper onto the medium-density fiberboard to form the surface material layer 2. At this time, due to the high temperature, the water in the melamine-impregnated paper evaporates rapidly, reducing the moisture content and making the paper more brittle. If bent directly, it will easily break.

[0046] Step 6: Cut the 4.5mm cork board 1, 3.0mm multilayer board 3 and the surface material layer 2 in step 5 according to the finished product size requirements, leaving processing allowances, and cutting the base material and surface material according to the above processing allowance parameters;

[0047] Step 7: Fix the wooden mold in step 4 on the press, and spray a small amount of impregnated paper softener liquid on the surface of the impregnated paper. After spraying the impregnated paper softener liquid, the brittleness of the impregnated paper can be improved, its elasticity can be increased, and the problem of impregnated paper bending and breaking can be solved. The use of the impregnated paper softener liquid can dissolve and swell the polymer particles in the impregnated paper after the brittleness is increased, thereby increasing its plasticity; then further apply glue on one side of the base material and surface material cut in step 6 in a symmetrical order of the internal structure of the arc plate, and stack them on the lower mold. The stacked plate structure includes a multi-layer board 3 in the middle and a cork board 1 and a surface material layer 2 symmetrically arranged on both sides of the multi-layer board 3 from the inside to the outside; and when using high-frequency hot pressing equipment for pressing, a metal plate that can conduct heat can be installed on the unitized spliced wooden mold and connected to the high-frequency hot press;

[0048] Step 8: Slowly sink the upper mold fixed on the press in step 7 with a small pressure until it is pressed tightly. After the glue is cured, the mold can be removed and the pressed curved plate rough material is taken out. When using the hot pressing process, after pressing tightly, control the high-frequency hot press to slowly heat to 115°C at 1°C / s to avoid the non-equilibrium movement of water molecules in the plate due to instantaneous hot pressing, which will cause local accumulation of internal stress and deformation of the curved plate;

[0049] Step 9: In step 8, spray a small amount of impregnated paper softener ratio liquid on the curved plate rough material where it needs to be cut. By spraying the impregnated paper softener ratio liquid a second time on the part that needs to be refined, the softness of the impregnated paper can also be increased to prevent the problem of edge bursting during cutting; further refine according to the drawing and perform edge sealing treatment on all sides;

[0050] Step 10: Punch hinge holes on the curved plate after edge banding in step 9 for installing hardware.

[0051] In this embodiment, the impregnated paper softener liquid is prepared by diluting the impregnated paper softener and tap water or industrial alcohol in a ratio of 1:5-30. The specific ratio needs to be adjusted according to the thickness of the impregnated paper. The impregnated paper softener liquid includes the following components by weight: 2-3 parts of fatty alcohol polyoxyethylene ether, 1-2 parts of trihydroxymethylpropane, 1-2 parts of sodium chloride, 2-3 parts of sodium lauryl sulfate and 3-4 parts of deionized water; the penetrant is sprayed on the surface of the melamine impregnated paper for softening, effectively solving a series of problems after the melamine impregnated paper is heated and pressed onto the balancing layer, such as high brittleness, easy cracking when bending, and easy edge bursting when cutting.

[0052] In step 3, the cork board has a thickness of 4.5mm. The cork board includes two layers of poplar veneers and a pear veneer sandwiched between the two poplar veneers. The poplar veneer and the pear veneer have textures that are interlaced and laminated, leaving a processing allowance of 30-50mm. In the present embodiment, the cork board is made of two layers of 2.0mm poplar and a layer of 0.5mm pear texture interlaced. The pear board has the characteristics of dense wood and high toughness. Its texture is perpendicular to the poplar texture. When the cork is bent, it can give the poplar veneer a lateral tension to prevent the board from breaking when bending. This effectively prevents the board from breaking when bending, further improving the deformation resistance of the curved board. The multilayer board used as the substrate intermediate layer structure has a thickness of 3.0mm. The 3.0mm multilayer board can ensure the symmetry of the upper and lower structures of the substrate.

[0053] Preferably, in step 2, the MDF is 3.0 mm thick, a thin type of MDF. The hot pressing pressure is 12-15 MPa, the temperature is 195-215°C, and the pressing time is controlled within 14-25 seconds. This 3.0 mm thickness effectively avoids appearance defects caused by substrate defects. Thin MDF is relatively soft and can be bent effectively to achieve the desired curvature.

[0054] As a preferred method, in step 4, the glue used is EVA modified emulsion, and the glue is applied in the form of single-sided glue, the glue amount is 300-350g / ㎡, and the glue application time is within 30 minutes. When applying glue, single-sided glue is used, which can well control the single-layer glue amount to 300-350g / m 2 , prevent glue overflow and ensure the moisture content of the board. Too high or too low moisture content of the board will easily cause the board to deform. It is better to keep the moisture content of the board at 10%-15%.

[0055] As a preferred method, step 5 includes two processes: cold pressing and hot pressing. During cold pressing, the pressure is 1-2 MPa, and the cold pressing time depends on the ambient temperature, which is 6-8 hours in summer and 10-12 hours in winter. During hot pressing, the pressure is 10-13 MPa, and the hot pressing time is 15-20 minutes.

[0056] Figure 4This is a schematic diagram of the size change of the curved cabinet door panel prepared by the present invention. It can be seen that the curved cabinet door panel prepared by the present invention has good structural dimensional stability.

Claims

1. A high-stability paint-free curved cabinet door processing technology, characterized by: The following steps are included: Step 1: Prepare a wooden mold according to the size requirements of the curved cabinet door. The wooden mold includes an upper mold and a lower mold. The lower mold has a concave cavity, and the arc inner wall of the concave cavity is adapted to the arc of the curved cabinet door to be processed; Step 2: hot pressing the melamine impregnated paper onto the medium-density fiberboard to form a surface material layer; Step 3: Cut the 2-8mm cork board, 2-6mm multilayer board and the surface material layer in step 2 according to the finished product size requirements, leaving processing allowances, and cutting the above boards according to the processing allowance parameters; Step 4: Fixing the wooden mold in step 1 on a press, spraying a paper softener mixture on the melamine-impregnated paper, further gluing the corkboard, multilayer board, and surface material layer cut in step 3 on one side in a symmetrical order of the internal structure of the curved board, and stacking them in the curved concave cavity of the lower mold of the wooden mold, wherein the paper softener mixture is prepared by diluting the paper softener with tap water or industrial alcohol in a ratio of 1:5-30, and the paper softener mixture comprises the following components in parts by weight: 2-3 parts of fatty alcohol polyoxyethylene ether, 1-2 parts of trihydroxymethylpropane, 1-2 parts of sodium chloride, 2-3 parts of sodium lauryl sulfate, and 3-4 parts of deionized water; Step 5: Slowly lower the upper mold fixed on the press in step 4 with a fixed pressure until the laminated plates stacked on the lower mold in step 4 are pressed tightly. After the glue is cured, the mold can be removed and the pressed curved plate rough material can be taken out; Step 6: Spray the impregnated paper softener mixture on the curved plate rough material where it needs to be cut in step 5, perform further refinement according to the drawing, and perform edge sealing on all sides; Step 7: Punch hinge holes on the curved plate after edge banding in step 6 to obtain the desired curved cabinet door panel; Among them, the wooden mold in step 1 is spliced by unit molds and processed in the following way: Step 1: Draw the required upper and lower template shapes according to the drawing size requirements of the curved cabinet door panel to be processed, convert the above processing parameters into CNC engraving files, and use the CNC machining center to engrave the mold shape on the panel. The number of templates depends on the required size of the drawing. For every 300mm increase in the length of the curved cabinet door panel, an additional set of upper and lower templates is required; Step 2: Cut out several 100mm*300mm wooden strips to connect the formwork; Step 3: Connect the template in step 1 with the wooden strips in step 2 to form a unit mold. The gap between the wooden strips is 10mm and the spacing is consistent to ensure that the pressure at each point of the curved plate is consistent when pressure is applied later; Step 4: Connect the unit molds in step 3 to form a mold prototype, and reinforce the back of the mold prototype with a board to prepare a wooden mold; In step 3, the cork board includes poplar veneers on both sides and a pear veneer sandwiched between the two poplar veneers. The poplar veneers and the pear veneers are laminated with their textures alternating horizontally and vertically, leaving a processing allowance of 30-50 mm.

2. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized by: In step 3, the 4.5 mm thick cork board, the 3.0 mm thick multilayer board and the surface material layer in step 2 are cut according to the processing allowance parameters with reserved processing allowance according to the finished product size requirements.

3. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized in that: In step 2, the thickness of the medium density fiberboard is 1.5-4.0 mm, the hot pressing pressure is 12-15 MPa, the temperature is 195-215° C., and the time is controlled at 14-25 seconds.

4. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized in that: In step 4, the glue used is EVA modified emulsion, which is applied in the form of single-sided adhesive, with an adhesive amount of 300-350g / ㎡ and a gluing time of less than 30 minutes.

5. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized in that: Step 5 includes two processes: cold pressing and hot pressing. During cold pressing, the pressure is 1-2 MPa, and the cold pressing time depends on the ambient temperature, which is 6-8 hours in summer and 10-12 hours in winter. During hot pressing, the pressure is 10-13 MPa, and the hot pressing time is 15-20 minutes.

6. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized in that: In step 6, the two straight edges are banded with a linear edge banding machine, and the two arc edges are banded manually. Manual edge banding refers to applying edge banding glue on the PVC edge banding strip of the same color as the panel, heating the edge banding strip with a handheld hot air blower to soften it, and bonding it to the arc edges at both ends. A flattening tool is used to tightly fit the edge banding strip to the panel, and then a utility knife is used to fine-tune the chamfering of the edge banding strip.

7. The high-stability paint-free curved cabinet door processing process according to claim 1 is characterized in that: In step 7, the hinge hole punching device uses a woodworking hinge drill.

8. A curved cabinet door manufactured by the high-stability paint-free curved cabinet door manufacturing process according to any one of claims 1 to 7.

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