WELDING DEVICE FOR PVC PROFILES
The device addresses weld joint issues in PVC profiles by using dual heating devices to form grooves and heat edges, ensuring precise alignment and improved mechanical strength.
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Utility models
- Current Assignee / Owner
- KABAN MAKINA SANAYI & TICARET LTD SIRKETI
- Filing Date
- 2024-04-29
- Publication Date
- 2026-04-17
AI Technical Summary
Conventional PVC profile welding machines face issues with aesthetically unacceptable weld joints due to protruding molten material and misalignment, leading to reduced mechanical strength and increased production costs.
A device with support means, drive means, and dual heating devices that form grooves on profile ends, heat the outer edges of these grooves, and ensure precise alignment, followed by welding with a heating plate to create chamfered edges for improved aesthetics and strength.
Ensures perfect alignment and high mechanical resistance of welded PVC profiles by eliminating unsightly protrusions and enhancing joint quality.
Smart Images
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Abstract
Description
Title of the invention: WELDING DEVICE FOR PVC PROFILES technical field
[0001] The present invention relates to a device which allows the assembly of polyvinyl chloride (PVC) profiles commonly used in the production of doors, windows and other related elements by heat welding. Technological background
[0002] Structures designed for assembling PVC profiles are produced by positioning the profiles perpendicular to each other and welding them together to define a frame shape. This welding process involves cutting the ends of the profiles at a 45-degree angle and joining these angled (i.e., "beveled") ends using a heat source. EP2255942, for example, describes such PVC profiles.
[0003] PVC profile welding machines are usually equipped with a profile table and an upper pressing element that support the profiles from below and above, respectively. Because the positional accuracy of the moving components on PVC welding machines is important, these components are configured to be controlled by electronically driven motors.
[0004] On certain welding machines known for PVC profiles, the ends of the profiles to be welded are milled to remove chips with a milling cutter before the welding operation is performed. This milling cutter generally moves in a plane perpendicular to the cut ends of the profiles, creating a groove along the outer circumference of the cut ends. This milling operation allows the joining surfaces of the profiles to take on a shape that protrudes slightly beyond the outer circumference for welding.
[0005] Conventional welding machines include a heating plate equipped with a heating element. Before the welding operation, the heating plate is positioned away from the ends of the profiles and, when the time comes, it is moved to a position between the joining surfaces of the profiles. Then, the profiles are brought together and placed in contact with the hot heating plate. This contact can be maintained for a certain time (e.g., 10 to 20 seconds). During the contact between the heating plate and the profiles, the protrusions on the joining surfaces of the profiles to be welded (i.e., the protrusions remaining after milling) are heated. Then, the heating plate is removed. The ends of the profiles and the heated assembly surfaces are pressed together to be welded.
[0006] During the welding operation, the molten protruding material on the joining surfaces of the profiles to be welded spreads in a planar direction perpendicular to the joining surface (both inwards and outwards from the profile). The molten material spreading outwards may protrude slightly beyond the weld joint. This situation results in an appearance that is not aesthetically acceptable to the end user. Therefore, the material protruding from the weld joint is removed with a cutting blade. However, this additional step not only increases the cost but can also create an unsightly result in the area of the weld joint.
[0007] Furthermore, conventional welding machines for PVC profiles are not always capable of perfectly welding the profiles together. This is because, during welding, one profile may end up slightly above, below, or level with the other profile. Such a misalignment can reduce the mechanical strength of the welded joints and the overall quality of the products. Therefore, achieving perfect alignment between the profiles during the welding operation is critical for production efficiency and product quality. Summary of the invention
[0008] The object of this invention is to propose a welded assembly of polyvinyl chloride (PVC) profiles which ensures perfect mutual compatibility and offers high mechanical resistance.
[0009] A device for heat-sealing a first profile onto a second profile, each made of a PVC material and each having a beveled end, comprising support means for supporting each profile from below and above, drive means for bringing the profiles closer together and further apart, at least one milling device for forming a groove on the upper and lower surfaces of each of the beveled ends of the profiles and a movable heating device between and out of the beveled ends of the profiles, characterized in that at least one second heating device is provided for heating the outer edges of each groove, each outer edge extending in one direction along the upper and lower surfaces of the profiles.
[0010] According to some embodiments of the invention, the second heating device comprises a heating body and a heating element located within the heating body. Furthermore, according to some embodiments of the invention, the heating body comprises at least one contact surface that forms an acute angle with the horizontal to touch the outer edge of the groove. Brief description of the figures
[0011] Fig. 1 represents a front view of the ends of two PVC profiles to be welded, brought close together.
[0012] Figure 2 shows a front view at the moment the heating device touches the outer edges of the grooves made on the beveled ends of the PVC profiles.
[0013] Fig. 3 represents a detailed front view of the beveled ends of the PVC profiles shown in Fig. 2. List of reference signs
[0014] 1 First profile
[0015] 2 Second profile
[0016] 3 Upper surface of the first profile
[0017] 4 Lower surface of the first profile
[0018] 5 Upper surface of the second profile
[0019] 6 Lower surface of the second profile
[0020] 7 Upper groove of the first profile
[0021] 8 Lower groove of the first profile
[0022] 9 Upper groove of the second profile
[0023] 10 Lower groove of the second profile
[0024] 11 Outer edge of the groove
[0025] 12 Second heating device
[0026] 13 Heating element
[0027] 14 Heating element
[0028] 15 Heating contact surface
[0029] 16 Front view
[0030] 17 Thermal barrier Description of the implementation methods
[0031] By means of the device according to the invention, as seen in [Fig. 1], a first profile (1) made of PVC material is welded to a second profile (2) made of PVC material after heat has been applied to the ends of the profiles to be joined using a heating device (it was not considered necessary to show the heating device in the figures). The ends of the profiles (1, 2) to be joined are first cut at a 45-degree angle to form a bevel shape (it was not considered necessary to show the bevel shape in the figures).
[0032] At the beveled end of the first profile, an upper groove (7) and a lower groove (8) are formed respectively on the upper surface (3) and the lower surface (4) of this profile by means of a milling device (it has not been estimated (It is necessary to show the milling device in the figures). Similarly, at the beveled end of the second profile, an upper groove (9) and a lower groove (10) are formed on the upper surface (5) and the lower surface (6) of this profile by means of the milling device.
[0033] The grooves (7, 8, 9, 10) along the upper and lower surfaces (3, 4, 5, 6) The profiles (1,2) define an outer edge of the groove (11). In other words, the edge formed on the outside by the groove along the upper and lower surfaces of each profile, i.e. in the direction of the vertical width of the profile, is the outer edge of the groove.
[0034] As can be seen in [Fig. 2] or [Fig. 3], after the first profile (1) with a groove (7, 8) formed at its beveled end and the second profile (2) with a groove (9, 10) formed at its beveled end have been brought together by driving means, a second heating device (12) touches the outer edges of the grooves (11) of each profile (1, 2) and melts these edges longitudinally. Thus, the outer edges of the grooves (11) are freed from their "angular" shape and take on a shape as if they had been chamfered or as if the corners had been rounded.The method of applying the second heating device (12) can be configured in such a way that, if the profiles (1,2) are covered with a coating material, the melting of this material caused by the contact of the second heating device (12) with the outer edges of the grooves (11) does not allow the material underneath to be seen from the outside.
[0035] The second heating device (12) may include a heating element (13) and a heating element (14) located inside it, such as a resistor. A thermal barrier (17) is disposed on the upper part of the heating element (13). The thermal barrier (17) may be selected from materials (preferably plastic-based materials) known to those skilled in the art, such as a composite and / or fiberglass-reinforced material. The thermal barrier (17) prevents the heat generated in the heating element (13) from negatively affecting the second heating device (12) and / or other components of the device according to the invention.
[0036] The surfaces (15) of the heating element (13) that come into contact with the outer edges of the grooves (11) are formed to form an acute angle with the horizontal. According to some embodiments of the invention, the acute angle may preferably be between 10 degrees and 75 degrees. In some embodiments of the invention, the acute angle may be between 30 degrees and 60 degrees. In other embodiments of the invention, the acute angle may be between 40 and 50 degrees.
[0037] As shown in [Fig. 2], there may be more than one second heating device (12). In this case, the outer edges of the grooves (11) on the upper surfaces (3, 5) of the first profile (1) and the second profile (2) may be heated with one second heating device (12), and the outer edges of the grooves (11) on the lower surfaces (4, 6) with another second heating device (12). The movement of the second heating device(s) (12) may be facilitated by a drive means known to those skilled in the art, such as a servomotor, a stepper motor, or a piston, etc. The second heating device(s) may preferably be configured to move in a vertical direction.
[0038] The temperature resulting from the heat applied by the second heating device (12) to the outer edges of the grooves (11) can be at a level suitable for causing melting, for example 140°C, 150°C, etc., and the contact time can also be appropriately determined, for example between 5 and 20 seconds, etc.
[0039] After the second heating device (12) has applied heat to the outer edges of the grooves (11), it is moved away from the profiles (1, 2). Next, the profiles (1, 2) are moved to slightly increase the distance between them, and a heating device, generally in the form of a plate as is known to those skilled in the art, is positioned between the end faces (16) of the profiles. In a manner known to those skilled in the art, the profiles (1, 2) are brought together and brought into contact with this hot heating device for a moment to melt the end faces (16). Then, the profiles (1, 2) are separated, the heating device is removed from the profiles (1, 2), and the profiles (1, 2) are pressed together to ensure welding.
[0040] When the profiles (1,2) are welded together, a very slight form of indentation may appear along the weld because the outer edges of the grooves (11) have been previously melted by the second heating device (12) because these edges have a shape as if they had been chamfered or as if the angles had been rounded.
Claims
Demands
1. A device for heat-sealing a first profile (1) onto a second profile (2), each made of a PVC material and each having a beveled end, comprising support means for supporting each profile (1, 2) from below and above, drive means for bringing the profiles (1, 2) closer together and further apart, at least one milling device for forming a groove (7, 8, 9, 10) on the upper surfaces (3, 5) and the lower surfaces (4, 6) of each of the beveled ends of the profiles, and a movable heating device between and away from the beveled ends of the profiles (1, 2), characterized in that at least one second heating device (12) is provided for heating the outer edges (11) of each groove, each outer edge (11) extending in one direction along the upper surfaces (3, 5) and the lower surfaces (4, 6). 6) profiles (1,2).
2. Device according to claim 1, characterized in that said second heating device (12) comprises a heating body (13) and a heating element (14) placed in the heating body (13).
3. Device according to claim 2, characterized in that said heating body (13) comprises at least one contact surface (15) forming an acute angle with the horizontal to come into contact with the outer edge (11) of each groove (7, 8, 9, 10).
4. Device according to claim 3, characterized in that the acute angle is between 10 degrees and 75 degrees.
5. Device according to claim 4, characterized in that the acute angle is between 30 degrees and 60 degrees, more preferably between 40 and 50 degrees.
6. Device according to any one of the preceding claims, characterized in that it comprises two second heating devices (12), one for applying heat to the beveled ends on the upper surfaces (3, 5) of the first profile (1) and the other for applying heat to the beveled ends on the lower surfaces (4, 6) of the second profile (2).
7. Device according to any one of the preceding claims, characterized in that a thermal barrier (17) is disposed on the upper part of the heating body (13).