Positioning device for improving precision of annular size for tailored blank laser welding

Abstract

According to the positioning device for improving the annular size precision of tailored blank laser welding, parts of a plurality of clamping modules are arranged corresponding to a welding bearing module, and when the clamping modules at the position of the welding bearing module work, a second pressing plate and a supporting strip clamp a blank; according to the positioning device for improving the annular size precision of laser tailored blank welding, the contour positioning module is matched with the clamping module, high-precision positioning of the blank is achieved, the positioning precision is improved, due to the fact that the structure of the positioning unit is simplified, the clamping time is greatly shortened, rapid positioning and clamping are achieved, and the production efficiency is improved. The production and manufacturing cost is reduced, and the production efficiency is improved; a complex electromagnet and a high-precision gap prefabrication or detection device in a traditional positioning and clamping mechanism are abandoned, the structural complexity of the positioning device is simplified, dependence on precision parts is reduced, the integration degree and compactness of the positioning device are improved, and an economic basis is provided for popularization and promotion of the laser splicing technology.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of welding tooling, especially relates to a positioning device of laser tailor-welded ring size precision promotion. BACKGROUND

[0002] With the development of hot forming technology, tailor-welded technology is used more and more, and tailor-welded sheet forming technology can fully utilize the performance advantages of different materials and achieve the purpose of lightweight of parts to some extent, especially integrated parts such as door inner plate and B column, therefore, the application of tailor-welded sheet forming technology greatly improves the comprehensive forming performance of parts.

[0003] However, through the research on the existing tailor-welded production process implementation scheme, it is found that the above process at least has the following technical problems: for the welding equipment, the laser tailor-welding machine is generally provided with a weld seam tracking system, and the laser head automatically tracks the plate tailor-welding joint; for the tooling fixture used for positioning the welded parts during the welding process, the fixture is positioned by the clamping unit, and the tooling fixture is also provided with a device for controlling the weld seam gap, which causes the fixture to be too complex and heavy, increases the cost of the equipment, and increases the tailor-welding processing cost and reduces the welding efficiency; for the ring-shaped product, since the welding edge line is used for positioning the blank, the precision of the blank is extremely high, and when the precision of the blank cannot meet the requirement (the flatness of the bottom surface of the blank is less than 1mm per square meter), it is impossible to ensure that the product is spliced into a closed ring by using the welding edge positioning, and there is also a problem of tolerance accumulation in the integrated ring positioning system, which causes the product yield and good rate to be low; since the existence of the deviation of the laser path and the plate joint will greatly affect the weld seam quality of the tailor-welded sheet, a large amount of time is spent in positioning the plate joint and the laser path during the test process to make them coincide to ensure the tailor-welding quality. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the utility model is to provide a positioning device for laser tailor-welded ring size precision promotion, which aims to solve the problem of excessive time consumption in positioning the plate joint and the laser path during the welding process of the ring-shaped product.

[0005] In order to achieve the above purpose, the utility model provides a positioning device for laser tailor-welded ring size precision promotion, which is used for positioning and splicing a plurality of blanks to form a to-be-welded part, a to-be-welded seam is formed between adjacent blanks, and the positioning device comprises:

[0006] A base plate;

[0007] A plurality of support modules are installed on the base plate and correspond to the lower surface of the to-be-welded part;

[0008] A plurality of profile positioning modules are installed on the base plate and arranged corresponding to the intervals between the side walls of the workpiece to be welded, and each profile positioning module comprises a first linear drive and a first pressing plate driven by the first linear drive, which is arranged corresponding to the side wall of the workpiece to be welded;

[0009] A plurality of clamping modules are installed on the base plate and arranged corresponding to the upper surface of the workpiece to be welded, and each clamping module comprises a second linear drive and a second pressing plate driven by the second linear drive, which is arranged corresponding to the upper surface of the workpiece to be welded;

[0010] A plurality of welding support modules are installed on the base plate and have two parallel support bars at the upper end, and a cooling water cavity is arranged in the support bar, which is connected to an external cooling water circulation system, and the welding support module is arranged corresponding to the weld to be welded between the two blanks;

[0011] Part of the plurality of clamping modules is arranged corresponding to the welding support module, and when the clamping module at the position of the welding support module works, the second pressing plate and the support bar clamp the blank.

[0012] Further, a third linear drive is arranged on the welding support module corresponding to the support bar, which drives the support bar to rise and fall.

[0013] Further, at least part of the plurality of profile positioning modules is arranged in pairs, and each pair of profile positioning modules clamps the blank in the width direction of the blank.

[0014] Further, the profile positioning module comprises a profile base, and the first linear drive is installed on the profile base, and the upper surface of the profile base supports the blank.

[0015] Further, the first linear drive and the second linear drive are of the pneumatic drive type.

[0016] Further, four clamping modules are arranged corresponding to each welding support module, respectively, and two clamping modules are arranged corresponding to the two ends of the support bar in the length direction, respectively.

[0017] Further, the support module, the profile positioning module, the clamping module and the welding support module are fixed to the base plate by bolts.

[0018] Further, the positioning device further comprises a plurality of positioning pin modules, which can be detachably connected to any one of the support module, the profile positioning module, the clamping module and the welding support module.

[0019] Further, the positioning device further comprises a negative pressure system, the negative pressure system comprising a negative pressure source and a plurality of negative pressure suction ports derived from the negative pressure source, the negative pressure suction ports being detachably installed on the support module.

[0020] Further, the positioning device further comprises a cooling water circulation system, the cooling water circulation system being connected to cooling water cavities of the plurality of support bars.

[0021] The positioning device for improving the size precision of laser tailor-welded annular provided by the utility model realizes high-precision positioning of the blank through the cooperation of the contour positioning module and the clamping module, the positioning mode improves the positioning precision, greatly shortens the clamping time due to the simplification of the positioning unit structure, realizes rapid positioning and clamping, reduces the production manufacturing cost, improves the production efficiency, discards the complex electromagnet and high-precision gap prefabrication or detection device in the traditional positioning and clamping mechanism, simplifies the structural complexity of the positioning device, reduces the dependence on precision components, improves the integration and compactness of the positioning device, provides an economic basis for the popularization and promotion of the laser splicing technology, and provides a new idea for the automation and intelligent upgrading of related industries. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the top view of the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model;

[0023] Figure 2 is the top view of the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model (the blank is installed);

[0024] Figure 3 is the perspective view of the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model;

[0025] Figure 4 is the schematic view of the support module in the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model;

[0026] Figure 5 is the schematic view of the contour positioning module in the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model;

[0027] Figure 6 is the schematic view of the clamping module of the contour positioning module in the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model;

[0028] Figure 7 is the schematic view of the welding support module in the positioning device for improving the size precision of laser tailor-welded annular of the first embodiment of the utility model.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0031] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” “the,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connection or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0033] Reference Figures 1 to 7 In one embodiment of this utility model, a positioning device for improving the dimensional accuracy of laser-welded annular shapes is used to position and assemble multiple blanks 010 to form a workpiece to be welded, wherein a weld seam 001 is formed between adjacent blanks 010, comprising:

[0034] substrate 100;

[0035] Multiple support modules 200 are mounted on the substrate 100 and are disposed corresponding to the lower surface of the workpiece to be welded;

[0036] Multiple contour positioning modules 300 are mounted on the substrate 100 and arranged at intervals corresponding to the peripheral wall of the workpiece to be welded. Each contour positioning module 300 includes a first linear drive 310 and a first pressure plate 320 driven by the first linear drive 310. The first pressure plate 320 is arranged corresponding to the side wall of the workpiece to be welded.

[0037] A plurality of clamping modules 400 are installed on the base plate 100 and arranged corresponding to the upper surface of the to-be-welded part, and the clamping module 400 comprises a second linear drive 410 and a second pressing plate 420 driven by the second linear drive 410, and the second pressing plate 420 is arranged corresponding to the upper surface of the to-be-welded part;

[0038] A plurality of welding support modules 500 are installed on the base plate 100, and the upper end is two parallelly arranged support bars 510, the support bar 510 is provided with a cooling water cavity 511, the cooling water cavity 511 is connected to an external cooling water circulation system, and the welding support module 500 is arranged corresponding to the to-be-welded seam 001 between the two blanks 010;

[0039] Part of the plurality of clamping modules 400 is arranged corresponding to the welding support module 500, when the clamping module 400 at the position of the welding support module 500 works, the second pressing plate 420 and the support bar 510 clamp the blank 010.

[0040] In the prior art, due to the existence of the deviation of the laser path and the plate pair seam, the welding seam quality of the tailor-welded blank is greatly affected, so a large amount of time is spent in positioning the plate pair seam and the laser path during the test process, thereby causing the problems of process complexity and time consumption.

[0041] The positioning device for improving the dimensional accuracy of the laser tailor-welded ring is used for positioning and splicing a plurality of blanks 010 to form a to-be-welded part, a to-be-welded seam 001 is formed between adjacent blanks 010, and comprises:

[0042] The base plate 100 serves as the basis of the entire positioning device.

[0043] A plurality of support modules 200 are installed on the base plate 100 and arranged corresponding to the lower surface of the to-be-welded part. The top end of the support module 200 can be detachably provided with a pad, so that the blank 010 is supported. In some embodiments, the support module 200 can be provided with a height-adjustable type, thereby improving the flexibility of use.

[0044] A plurality of contour positioning modules 300 are installed on the base plate 100 and arranged corresponding to the interval between the side walls of the to-be-welded part. The contour positioning module 300 comprises a first linear drive 310 and a first pressing plate 320 driven by the first linear drive 310, and the first pressing plate 320 is arranged corresponding to the side wall of the to-be-welded part. The blank 010 is fixed on the plane by the plurality of contour positioning modules 300.

[0045] The plurality of clamping modules 400 includes a second linear drive 410 and a second pressing plate 420 driven by the second linear drive 410, which is arranged corresponding to the upper surface of the workpiece to be welded. The blank 010 is fixed in the thickness direction by the clamping module 400. It should be noted that the first linear drive 310 and the second linear drive 410 complete linear driving, but the action effect achieved is not limited to linear and can also be overturning, etc.

[0046] The plurality of welding support modules 500 is installed on the base plate 100 and the upper end is two parallel arranged support bars 510, the support bar 510 is provided with a cooling water cavity 511, and the cooling water cavity 511 is connected to an external cooling water circulation system. The welding support module 500 is arranged corresponding to the weld seam 001 between the two blanks 010. The support bar 510 on the welding support module 500 limits the weld seam 001. The cooling water cavity 511 ensures that the support bar 510 takes away heat to avoid adverse effects caused by overheating during welding. Positioning blocks can be arranged on the welding support module 500 to ensure the accuracy of the position of the weld seam 001.

[0047] Part of the plurality of clamping modules 400 is arranged corresponding to the welding support module 500, when the clamping module 400 at the position of the welding support module 500 works, the second pressing plate 420 and the support bar 510 clamp the blank 010. By arranging the clamping module 400 in cooperation with the welding support module 500, the position of the blank 010 at the position of the weld seam 001 is more accurate.

[0048] In the process of use, according to the accuracy requirements at different positions, the loading sequence part mainly analyzes the data of the shape of the blank 010 and the influence of the blank 010 on the accuracy of the whole product, and the blank 010 which has greater influence on the accuracy of the product (for example, door ring: generally A column and B column two positions, to ensure the positioning accuracy of the product in the later process, improve the yield of the product, and in the product design process, reduce the edge line of the product, improve the utilization rate of materials), the subsequent blank 010 is positioned and loaded according to the welding edge line of the previously fixed blank 010 and its own contour.

[0049] In a typical processing process, the number of blanks 010 is five, which are blank 010A for A column part of vehicle body, blank 010B for B column part of vehicle body, blank 010C for door sill part of vehicle body, blank 010D for C column part of vehicle body, and blank 010E for upper segment of C column of vehicle body.

[0050] The blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body are key dimensions that affect the accuracy of the product itself, so the loading sequence of the five blanks 010 is as follows: the blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body are positioned and clamped, then the blank 010C at the rocker of the vehicle body and the blank 010E at the upper section of the C-pillar of the vehicle body are positioned and clamped, and finally the blank 010D at the C-pillar of the vehicle body is positioned and clamped. According to the loading sequence of the blank 010, the assembly positioning of the product is started:

[0051] In the first step, the blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body are placed and fixed at the position of the welding support module 500.

[0052] In the second step, the contour positioning module 300 and the clamping module 400 corresponding to the blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body are fixed, thereby completing the positioning and fixing of the blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body.

[0053] In the third step, according to the weld seam 001 to be welded of the blank 010A at the A-pillar of the vehicle body and the blank 010B at the B-pillar of the vehicle body, the blank 010C at the rocker of the vehicle body and the blank 010E at the upper section of the C-pillar of the vehicle body are placed and fixed at the position of the welding support module 500.

[0054] In the fourth step, the contour positioning module 300 and the clamping module 400 corresponding to the blank 010C at the rocker of the vehicle body and the blank 010E at the upper section of the C-pillar of the vehicle body are fixed, thereby completing the positioning and fixing of the blank 010C at the rocker of the vehicle body and the blank 010E at the upper section of the C-pillar of the vehicle body.

[0055] In the fifth step, according to the blank 010C at the rocker of the vehicle body and the blank 010E at the upper section of the C-pillar of the vehicle body, the blank 010D at the C-pillar of the vehicle body is placed and fixed at the position of the welding support module 500.

[0056] In the sixth step, the contour positioning module 300 and the clamping module 400 corresponding to the blank 010D at the C-pillar of the vehicle body are fixed, thereby completing the positioning and fixing of the blank 010D at the C-pillar of the vehicle body.

[0057] In the seventh step, after welding is completed, the contour positioning module 300 and the clamping module 400 are released, and the welded product is taken out.

[0058] Meanwhile, the support strip 510 continuously provides 12 liters per minute of cooling water, rapidly absorbs and removes the heat generated during welding, and keeps the blank 010 from being deformed by the heat generated by welding. The above is the process of implementing the entire scheme.

[0059] In summary, the cooperation of the contour positioning module 300 and the clamping module 400 realizes high-precision positioning of the blank 010. This positioning method not only improves the positioning accuracy, but also greatly shortens the clamping time due to the simplification of the structure of the positioning unit, realizes rapid positioning and clamping, reduces the production manufacturing cost, and improves the production efficiency. The complex electromagnet and high-precision gap pre-preparation or detection device in the traditional positioning and clamping mechanism are abandoned, the structural complexity of the positioning device is simplified, the dependence on precision components is reduced, the integration and compactness of the positioning device are improved, which provides an economic basis for the popularization and promotion of laser splicing technology and provides a new idea for the automation and intelligent upgrading of related industries.

[0060] With reference to Figure 7 In one embodiment, a third linear drive 520 is arranged on the welding support module 500 corresponding to the support bar 510, and the third linear drive 520 drives the support bar 510 to ascend and descend.

[0061] In this embodiment, the height of the support bar 510 can be adjusted by limiting the welding support module 500, so that the blank 010 can be better supported.

[0062] With reference to Figures 1 to 3 In one embodiment, at least part of the plurality of contour positioning modules 300 are arranged in pairs, and each pair of contour positioning modules 300 clamps the blank 010 in the width direction of the blank 010.

[0063] In this embodiment, the plurality of contour positioning modules 300 are arranged in pairs, so that a better clamping effect can be achieved on the blank 010, and finally the position accuracy of the to-be-welded part is guaranteed.

[0064] In one embodiment, the contour positioning module 300 includes a contour base, the first linear drive 310 is mounted on the contour base, and the upper surface of the contour base supports the blank 010.

[0065] In this embodiment, the contour positioning module 300 can not only limit and fix the outer peripheral wall of the to-be-welded part, but also support the blank 010 at this position.

[0066] In one embodiment, the first linear drive 310 and the second linear drive 410 are of a pneumatic drive type.

[0067] In this embodiment, the first linear drive 310 and the second linear drive 410 are limited to pneumatic push rods, which have the advantages of simplicity, reliability, and convenient control.

[0068] In one embodiment, four clamping modules 400 are arranged respectively corresponding to each welding support module 500, and two clamping modules 400 are arranged respectively corresponding to the two ends of the support strip 510 in the length direction.

[0069] In the embodiment, the installation mode of the clamping module 400 corresponding to the welding support module 500 is limited, and the clamping module 400 is arranged at the two ends of the support strip 510, so that the to-be-welded seam 001 formed between the adjacent blanks 010 at the position of the welding support module 500 is more regular.

[0070] In one embodiment, the support module 200, the contour positioning module 300, the clamping module 400 and the welding support module 500 are fixed to the base plate 100 by bolts.

[0071] In the embodiment, the bolt fixing mode has the advantages of stability and simple processing. The fixing holes are arranged on the base plate 100 corresponding to the support module 200, the contour positioning module 300, the clamping module 400 and the welding support module 500, and then the fixing process is completed by bolts. If certain adjustment is needed, only the fixing holes need to be processed at the corresponding positions on the base plate 100.

[0072] Referring to Figure 5 In one embodiment, the positioning device further comprises a plurality of positioning pin modules 600, which can be detachably connected to any one of the support module 200, the contour positioning module 300, the clamping module 400 and the welding support module 500.

[0073] In the embodiment, a plurality of positioning pin modules 600 are arranged, and the position of the blank 010 is fixed by the combination of the positioning pin module 600 and the specific hole position on the blank 010. The positioning pin module 600 can be disassembled and installed on the support module 200, the contour positioning module 300, the clamping module 400 and the welding support module 500. The shapes of the plurality of positioning pin modules 600 are not limited to be consistent, and the specific shapes are determined according to the installation and fixation of the positioning pin module 600 and the fixation of the blank 010.

[0074] Referring to Figure 4 In one embodiment, the positioning device further comprises a negative pressure system, the negative pressure system comprising a negative pressure source and a plurality of negative pressure suction ports 700 derived from the negative pressure source, and the negative pressure suction port 700 can be detachably installed on the support module 200.

[0075] In the embodiment, the introduction of the negative pressure system makes the blank 010 at the position of the support module 200 not only be supported, but also be fixed by the negative pressure suction port 700, so that the position of the blank 010 is more accurate, and provides a position basis for the improvement of the welding precision.

[0076] In one embodiment, the positioning device further comprises a cooling water circulation system connected to the cooling water cavities 511 of the plurality of support bars 510.

[0077] In this embodiment, the positioning device is provided with a cooling water circulation system, and low-temperature water generated by the cooling water circulation system is introduced into the cooling water cavities 511, so that the temperature of the support bars 510 of the welding support module 500 can be kept normal. The working form of the cooling water circulation system can be a heat pump type or a semiconductor type, etc., as long as it can generate low-temperature water.

[0078] In summary, the positioning device for improving the dimensional accuracy of laser welding rings provided by the present application realizes high-precision positioning of the blank 010 through the cooperation of the contour positioning module 300 and the clamping module 400. This positioning method not only improves the positioning accuracy, but also greatly shortens the clamping time due to the simplification of the positioning unit structure, realizes rapid positioning and clamping, reduces production manufacturing costs, and improves production efficiency. The complex electromagnet and high-precision gap pre-preparation or detection device in the traditional positioning and clamping mechanism are abandoned, the structural complexity of the positioning device is simplified, the dependence on precision components is reduced, the integration and compactness of the positioning device are improved, and an economic foundation is provided for the popularization and promotion of laser splicing technology, providing a new idea for the automation and intelligent upgrading of related industries.

[0079] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process conversion, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A positioning device for improving the dimensional accuracy of laser-welded annular components, used to position and assemble multiple blanks to form a workpiece to be welded, wherein a weld seam is formed between adjacent blanks, characterized in that... The positioning device comprises: a base plate; a plurality of supporting modules installed on the base plate and arranged corresponding to the lower surface of the workpiece to be welded; a plurality of profile positioning modules installed on the base plate and arranged corresponding to the interval between the side walls of the workpiece to be welded, the profile positioning module comprising a first linear drive and a first pressing plate driven by the first linear drive, the first pressing plate being arranged corresponding to the side wall of the workpiece to be welded; a plurality of clamping modules installed on the base plate and arranged corresponding to the upper surface of the workpiece to be welded, the clamping module comprising a second linear drive and a second pressing plate driven by the second linear drive, the second pressing plate being arranged corresponding to the upper surface of the workpiece to be welded; a plurality of welding support modules installed on the base plate and having two parallel support bars at the upper end, the support bar being provided with a cooling water cavity connected to an external cooling water circulation system, the welding support module being arranged corresponding to the weld seam between the two blanks. Part of the clamping modules correspond to the welding support module, and when the clamping module at the position of the welding support module works, the second pressing plate and the support bar clamp the blank.

2. The laser welding ring positioning device of claim 1, wherein, The welding support module is provided with a third linear drive corresponding to the support bar, and the third linear drive drives the support bar to rise and fall.

3. The laser welding ring positioning device of claim 1, wherein, At least part of the profile positioning modules are arranged in pairs, and each pair of profile positioning modules clamps the blank in the width direction of the blank.

4. The laser welding ring positioning device of claim 1, wherein, The profile positioning module comprises a profile base, and the first linear drive is installed on the profile base, and the profile base supports the blank on the upper surface.

5. The laser welding ring positioning device of claim 1, wherein, The first linear drive and the second linear drive are of the pneumatic drive type.

6. The laser-spun ring dimensional accuracy enhancing positioning device of claim 1, wherein, Four clamping modules are arranged corresponding to each welding support module, and two clamping modules are arranged corresponding to the two ends of the support bar in the length direction.

7. The laser-spun ring dimensional accuracy enhancing positioning device of claim 1, wherein, The supporting module, the profile positioning module, the clamping module and the welding support module are fixed to the base plate by bolts.

8. The laser-spun ring dimensional accuracy enhancing positioning device of claim 1, wherein, The positioning device further comprises a plurality of positioning pin modules, which can be detachably connected to any one of the supporting module, the profile positioning module, the clamping module and the welding support module.

9. The laser-spun ring dimensional accuracy enhancing positioning device of claim 1, wherein, The positioning device further comprises a negative pressure system, which comprises a negative pressure source and a plurality of negative pressure suction ports derived from the negative pressure source, and the negative pressure suction port can be detachably installed on the supporting module.

10. The laser-spun ring dimensional accuracy enhancing positioning device of claim 1, wherein, The positioning device further comprises a cooling water circulation system connected to the cooling water cavities of a plurality of support bars.

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