JP2012232340A - Sheet metal repair jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet metal repair jig which can improve repair accuracy, and at the same time, can reduce the work load of a worker, by performing smoothly the heating and the cooling of repair object portion of a sheet metal.SOLUTION: A sheet metal repair jig 1 is a jig to smooth the sheet metal by heating and cooling the repair object portion of the sheet metal. The sheet metal repair jig 1 includes a cylindrical roller 2 formed of a conductive material, a roller spindle 3 that supports rotatably the cylindrical roller 2 with a cylindrical rotating shaft, a support 4 that supports the roller spindle 3, an electrode 5 electrically connected to the cylindrical roller 2, being provided in one end of the support 4, and a cooling passage 6 that serves as a passage to discharge cooling air to the contact surface of the cylindrical roller 2.

Description

  The present invention relates to a sheet metal repair jig for repairing a dent or distortion generated on a curved surface or a peripheral surface of a sheet metal used in a vehicle or the like.

  When repairing sheet metal dents or distortions in the body of an automobile caused by contact or collision, first check the dents or distortions, remove the panel accessories that need repair, and check the dents or distortions. Remove the paint applied to the part. Next, using a puller or the like, the sheet metal at the dent or distortion is pulled out, knocked out, welded, etc., and the corresponding part is made almost flat. Subsequently, heating and cooling are repeated with respect to the corresponding portion, and the expansion by heating and the contraction by cooling are performed.

  The following technique has been proposed as a sheet metal repair jig for repairing such dents and distortions of the sheet metal (see Patent Document 1). This sheet metal repair jig includes a roller that serves as a heating means, a roller shaft that rotatably supports the roller, and a U-shaped holding frame that serves as a bearing for the roller shaft. Using this roller as a heat source, the roller is brought into contact with the repaired portion and moved at a uniform speed, so that the heat distribution of the sheet metal is less likely to be uneven and the repairing work can be performed without scratching.

Utility Model Registration No. 3154968

  As described above, it is necessary to repeat heating and cooling in the repair work of the dents and distortion in the sheet metal. In this regard, in the above conventional technique, the heating operation itself is facilitated by using the roller. However, in the case of cooling the repair target of the sheet metal, the worker has to put a roller for heating once and pick up a separate cooling device to perform the cooling work. For this reason, the worker has to perform the repair work while replacing the device for heating and the device for cooling, which is troublesome for the worker.

  Further, high-strength steel sheets used for automobile bodies and the like in recent years are vulnerable to heat and need to be heated and expanded at a low temperature. In such a steel sheet, it is important to cool immediately after heating so that the temperature does not rise too much. However, in the conventional sheet metal repair jig, it is necessary to change between the heating means and the cooling means each time, so that it is difficult to cool immediately after heating. In addition, if there is a time lag from heating to cooling, the temperature of the heating location may become higher than the control temperature of the heating means due to the degree of contact of the roller with the heating location of the sheet metal.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and its purpose is to smoothly heat and cool the repair target portion of the sheet metal, and to extremely improve the repair accuracy. Another object of the present invention is to provide a sheet metal repair jig capable of reducing the work burden on the operator.

  In order to solve the above problems, the invention described in claim 1 is a sheet metal repair jig for smoothing a sheet metal by heating and cooling a position to be repaired of the sheet metal, and is a heating means that is formed of a cylindrical conductive material. A roller, a roller support shaft that rotatably supports the roller with a cylindrical rotation shaft, a support body that includes the electrode that is electrically connected to the roller while supporting the roller support shaft, and sheet metal repair A cooling passage serving as an air passage for discharging cooling air with respect to a contact surface between the target position and the roller, and the cooling passage is formed in the roller support shaft and includes cooling air. A sheet metal repair jig comprising a discharge port for discharging the sheet metal toward a contact surface between the sheet metal repair target portion and the roller.

  In the above aspect, since the cooling air is discharged near the roller in contact with the repair target position of the sheet metal repair jig, it is possible to immediately cool after heating by the roller. In addition, the heating by such a roller enables not only the drawing process but also the smoothing of the repaired surface by the roller, and a more accurate repair is possible.

  Sheet metal used for automobile bodies and the like is subjected to curved surface processing and the like, so that internal stress remains. In this case, if the sheet metal is heated and then left for natural heat dissipation or left as it is, the curved surface shape or the like of the sheet metal is deformed. Therefore, it is required to cool immediately after heating. In this respect, in this embodiment, simultaneously with the heating by the roller, the sheet metal after the heating can be immediately cooled by the cooling air released from the discharge port through the cooling passage.

  According to such a present embodiment, it is possible to prevent the steel plate from becoming unnecessarily hot even by heating with a roller, particularly for a material that is sensitive to heat, such as a high-tensile steel plate, and repair at a low temperature is possible. become able to.

  In the past, since the heating means and the cooling means were separately provided, the worker placed the apparatus used for heating once after the heating of the repair target position of the sheet metal, and changed the apparatus used for cooling to perform cooling. It was. In this regard, according to this aspect, since heating and cooling can be performed with a single device, the labor of the operator can be saved significantly.

  Note that CO2 welding or MAG welding is generally known as a device for releasing gas in the vicinity of the working point, but these released gases are used as shielding gas to prevent the metal melted by arc welding from coming into contact with air. Therefore, the technical idea is completely different from the air for cooling of the present invention.

  The roller may increase in temperature beyond the controlled temperature due to increase / decrease in resistance due to increase / decrease of the contact area or contact for a long time. In this respect, in this aspect, the roller can be immediately cooled by the cooling means after being brought into contact with the roller, so that it is hardly affected by the contact area and the contact time. Therefore, it is possible to provide an apparatus that does not show a difference in skill from a skilled worker even in an unskilled worker in a sheet metal repair work that requires skilled skill after all.

  According to a second aspect of the present invention, in the first aspect of the invention, the roller is divided into a plurality of parts in the axial direction, and the discharge port is formed in a gap between the plurality of rollers.

  In the above aspect, the roller is divided into a plurality of parts, and the discharge port is provided in the gap to discharge the cooling air, so that the width direction (roller axial direction) of the contact surface between the sheet metal restoration target portion and the roller is reduced. Thus, the cooling air can be sent evenly.

According to the present invention as described above, a sheet metal repair jig capable of smoothly heating and cooling a repair target portion of a sheet metal, improving repair accuracy, and reducing an operator's work burden is provided. can do.

The perspective view which shows the whole structure of the sheet metal correction jig | tool which concerns on embodiment of this invention. The top view which shows the whole structure of the sheet metal correction jig | tool which concerns on embodiment of this invention. The side surface schematic diagram which shows the effect | action of the sheet metal correction jig | tool which concerns on embodiment of this invention. The top view which shows the whole structure of the sheet metal correction jig | tool which concerns on other embodiment of this invention. The perspective view which shows the whole structure of the sheet metal correction jig | tool which concerns on other embodiment of this invention.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the drawings.

[1. This embodiment]
[1-1. Constitution]
The sheet metal repair jig 1 according to the present embodiment heats and cools a repair target position of a sheet metal made of, for example, a general steel sheet, an aluminum sheet metal, a stainless steel sheet, a high-tensile steel sheet, etc., and smoothes and repairs the sheet metal. It is a jig for. As shown in FIGS. 1 and 2, the sheet metal repair jig 1 includes a cylindrical roller 2 formed of a conductive material, and a roller support shaft 3 that rotatably supports the roller 2 with a cylindrical rotation shaft. In order to discharge cooling air to the support 4 that supports the roller support shaft 3, the electrode 5 provided at one end of the support 4 and electrically connected to the roller 2, and the contact surface of the roller 2. And a cooling passage 6 serving as a passage.

  The roller 2 is a heating unit that generates resistance heat by passing an electric current. The roller 2 has a cylindrical shape and is made of a conductive material such as copper or ferrite. In the present embodiment, the roller 2 is composed of two parts (rollers 2a and 2b) having the same shape. The gap between the two rollers 2a and 2b depends on the size of the discharge port 6b described later, but is preferably set narrow as long as the function of the discharge port 6b can be secured.

  Here, as the material of the roller 2, copper or ferrite is used without using the carbon found in Patent Document 1 above. This is due to the following reason. That is, in Patent Document 1, heat generation performance is maintained without generating an arc. However, as pointed out in Patent Document 1, carbon has lower wear resistance than copper and decreases quickly. . For this reason, when used as a roller, the repair target portion of the sheet metal may not be appropriately flattened due to carbon that is worn and not smooth. In the present embodiment, such a disadvantage of carbon is that copper or ferrite having high wear resistance is used while adjusting a current flowing through the roller and providing a cooling means described in detail later.

  The roller support shaft 3 is a rod-like body that rotatably supports the two rollers 2a and 2b. The roller support shaft 3 is formed hollow up to an intermediate position of about half in the width direction so as to form a cooling passage 6 to be described later. Further, a discharge port 6b to be described later is formed in a gap portion between the two rollers 2a and 2b. Is forming.

  The support 4 is U-shaped in a plan view and has a configuration in which the roller support shaft 3 is supported at the left and right ends. In the present embodiment, as shown in FIG. 1, female screws are cut at the left and right ends of the roller support shaft 3, and the support 4 is fixed to the support 4 with nuts N therebetween. The method for fixing the roller support shaft 3 to the support 4 is not limited to such a fixing method, and various known fixing methods may be used as long as the roller support shaft 3 is fixed to the support 4. It can be adopted.

  The electrode 5 is formed on the bottom portion of the U having a U-shaped shape in plan view, and is provided in a direction orthogonal to the roller support shaft 3. The electrode 5 plays a role of a connecting portion that is electrically connected to an external current supply device (not shown). As this current supply device, for example, a known device as disclosed in Patent Document 1 as a sheet metal repair jig main body is used.

  The roller 2, the roller support shaft 3, the support 4 and the electrode 5 are all made of conductive members, and the current input to the electrode 5 via an external current supply device (not shown) is supported. It flows to the roller 2 through the body 4 and the roller support shaft 3.

  The cooling passage 6 is a cooling air conveyance path formed in the hollow of the roller support shaft 3. One end of the cooling passage 6 is provided with an inflow port 6a through which air flows from an external blower (not shown) (not shown), and the other end is provided with a discharge port 6b through which the inflowed air is discharged. In between, the flow path 6c is formed.

  The inflow port 6a is provided at one end where the support body 4 supports the roller support shaft 3, and a cooling air intake port is formed by connecting a blower nozzle of a blower to the inflow port 6a. On the other hand, the discharge port 6 b is a gap between the two rollers 2, and is provided at a central portion in the axial direction of the roller support shaft 3.

  The discharge port 6b is formed by a nozzle 6n, and by this nozzle 6n, the ejection direction of the discharge port 6b is provided in a direction perpendicular to the contact surface direction of the roller 2, that is, the plane direction shown in the plan view of FIG. ing. The set angle of the ejection direction is determined for the following reason. When the sheet metal repair jig 1 is used for repair work, a connection portion of a current supply device (not shown) is connected to the electrode 5, and a handle made of an insulator is provided on the exterior of the connection portion of the current supply device. Is provided. The operator holds the handle and moves the correction jig with the U-shaped plane of the support body 4 substantially combined with the plane of the sheet metal (see FIG. 3). Therefore, if the discharge port is provided in the direction of the U-shaped plane of the support 4, the discharge port 6 b can send cooling air near the contact surface of the two rollers 2 a and 2 b. Therefore, as described above, the ejection direction of the discharge port 6b by the nozzle 6n is configured to face the contact surface direction of the roller 2. However, the direction of the discharge port 6b can be changed as appropriate depending on the angle formed between the electrode 5 or the handle of the operator and the surface to be repaired of the sheet metal. Set the direction to hit directly.

  In this embodiment, as the air discharged from the discharge port 6b, carbon dioxide gas (CO2) can be used, as long as the repair target portion of the sheet metal, such as air or nitrogen, can be cooled. Any type.

[1-2. Action]
The sheet metal repair jig 1 according to the present embodiment having the above-described configuration operates as follows.
First, the electrode 5 is connected to the sheet metal repair jig 1 to an external current supply device (a known device is used) (not shown). At the same time, a blower nozzle (not shown) of a blower (not shown) is connected to an inflow port 6a provided at one end of the roller support shaft 3 to establish a cooling air blowing path.

  Subsequently, the worker starts the operation with the handle provided at the connection portion of the external current supply device connected to the electrode 5. At this time, by controlling the current value of the external current supply device, temperature control is performed when the sheet metal repair jig 1 comes into contact with the sheet metal.

  In this state, while holding the handle, the operator contacts the roller 2 with the position to be repaired of the sheet metal and rolls the roller 2 with respect to the surface to be repaired. At this time, a predetermined electricity flows from the external current supply device to the roller 2 via the electrode 5, the support 4 and the roller support shaft 3, and resistance heat is generated on the contact surface between the roller 2 and the sheet metal, thereby repairing the sheet metal. The position is heated. At the same time, cooling air is sent from an external blower, passes through the cooling passage 6 from the inflow port 6a, and is discharged from the discharge port 6b.

  Here, as shown in the schematic side view of FIG. 3, the nozzle provided at the discharge port 6 b of the cooling passage 6 is positioned so as to substantially face the repair surface A of the sheet metal when the sheet metal repair jig 1 is used. Provided. Therefore, the cooling air discharged from the nozzle is discharged from between the two rollers 2a and 2b, hits the sheet metal repair surface, diffuses to the left and right, and further sandwiches the front and rear of the sheet metal contact surface of the rollers 2a and 2b. spread.

[1-3. effect]
In the sheet metal repair jig 1 of the present embodiment as described above, the cooling air is discharged in the vicinity of the roller 2 in contact with the position to be repaired. Therefore, after heating by the roller 2, the heated portion is immediately cooled. Can do. In addition, the heating by such a roller enables not only the drawing process but also the smoothing of the repaired surface by the roller, and a more accurate repair is possible.

  Sheet metal used for automobile bodies and the like is subjected to curved surface processing and the like, so that internal stress remains. In this case, if the sheet metal is heated and then left to natural heat dissipation or left as it is, the curved surface shape or the like of the sheet metal may be deformed by residual stress. Therefore, it is required to cool immediately after heating. In this respect, in the sheet metal repair jig 1 of this embodiment, simultaneously with the heating by the roller 2, the sheet metal after heating can be immediately cooled by the cooling air discharged from the discharge port 6b through the cooling passage 6. Is possible. In particular, for heat-sensitive materials such as high-tensile steel plates, it is possible to prevent the steel plates from becoming unnecessarily hot due to heating by the rollers 2 and to repair at low temperatures.

  Previously, since the heating means and the cooling means were prepared separately, the worker placed the sheet metal repair jig used for heating once after heating the position where the sheet metal was to be repaired, and switched to the apparatus used for cooling to perform cooling. It was. In this regard, according to the sheet metal repair jig 1 in the present embodiment, heating and cooling can be performed with a single device, so that labor of the operator can be saved significantly.

  Note that CO2 welding or MAG welding is generally known as a device for releasing gas in the vicinity of the working point, but these released gases are used as shielding gas to prevent the metal melted by arc welding from coming into contact with air. Therefore, the technical idea of the sheet metal repair jig of the present embodiment is completely different from that of cooling air.

  Further, the roller 2 may increase in temperature beyond the controlled temperature due to increase / decrease in resistance due to increase / decrease of the contact area or contact for a long time. In this respect, the sheet metal repair jig 1 of the embodiment can be immediately cooled by the cooling means after the contact with the roller 2, and thus is hardly affected by the contact area and the contact time. Therefore, it is possible to provide an apparatus that does not show a difference in skill from skilled workers even in unskilled workers in sheet metal restoration work where skilled skills are important in the end.

  Further, the roller 2 is divided into a plurality (here, two), and the discharge port 6b is provided in the gap to discharge the cooling air. As shown in FIG. It becomes possible to send cooling air equally with respect to the width direction (roller axial direction) of the contact surface. In this embodiment, in particular, the roller is divided into two, and a cooling air discharge port is provided in the gap between the rollers located in the center. And by discharging cooling air from a position opposed to the sheet metal contact surface of the roller from this discharge port, the cooling air can be evenly sent to the entire contact surface of the repair target portion of the roller and the sheet metal. Become.

[2. Other Embodiments]
The present invention is not limited to the aspect shown in the above embodiment, and includes the following aspects, for example. That is, in this embodiment, the roller 2 is divided into two, and the discharge port 6b is provided in the roller support shaft 3 at the center of the two rollers. However, the present invention is not limited to such a mode, and the roller 3 It is also possible to divide the structure into even more, such as four.

  For example, like the sheet metal repair jig 10 shown in FIG. 4, the roller 20 is divided into three parts, two inlets 60 a are provided on both sides of the roller 20, and outlets 60 b are provided in two gaps between the rollers 20. Can take the configuration. In such an embodiment, as shown in FIG. 4, the roller support shaft 30 is formed by hollowing from both ends of the roller support shaft 30 to each third position in the width direction extending to the first discharge port 60 b. By forming the flow path 60c, it is possible to adopt a configuration in which two cooling passages 60 are formed from both ends and two discharge ports 60b are formed in accordance with this. Although not shown in the drawings, as a modification, a hollow is formed from one end of the roller support shaft to a position of about two-thirds in the width direction, a flow path is provided, and a discharge port and It is also possible to employ a configuration in which the

  In the above embodiment, the ejection direction of the nozzle 6n configured by the discharge port 6b is configured to be directed in a direction perpendicular to the planar direction shown in the plan view of FIG. However, the present invention is not limited to such an embodiment, and for example, the ejection direction of the nozzle 6n is directed in the same direction as the axis of the electrode 5, that is, in the direction directly below in the perspective view of FIG. 1 or the schematic diagram of FIG. It may be configured, or may be set in an oblique direction that is an intermediate direction between the direction perpendicular to the planar direction shown in the plan view of FIG. 2 and the same direction as the axis of the electrode 5. That is, a configuration in which the discharge direction of the nozzle 6n is directed in the same direction as the contact surface direction of the roller according to the angle at which the roller 2 is applied to the target portion of the sheet metal. In addition, for example, a configuration in which the discharge direction of the cooling air discharge port 6b in the nozzle 6n is variable by attaching the nozzle 6n to the support shaft 3 so as to be rotatable may be employed.

  As a modification of the embodiment shown in FIG. 1, an embodiment as shown in FIG. 5 is possible in addition to the embodiment in which cooling air is introduced from the end of the support shaft 3. FIG. 5 schematically illustrates the sheet metal repair jig 20 according to the modification from the planar direction. In FIG. 5, for convenience of explanation, the support 4 is cut out around the upper portion of the roller 2 and expressed as a cross section.

  Like the sheet metal repair jig 20 shown in FIG. 5, a cooling passage 61 is formed in the gap between the rollers 2 a and 2 b in a direction perpendicular to the support shaft 3, and an inlet 61 a for cooling air is formed at the end of the cooling passage 61. A provided configuration may also be adopted. At the inlet 61a of the cooling passage 61, a hose (shown by a phantom line in the drawing) extended from an external blower (not shown) is attached to send air. In this case, the discharge port 61 b is provided on the straight line of the introduction path of the cooling passage 61. The method of using the sheet metal repair jig 20 is the same as that shown in FIG.

  Further, in such an embodiment, as shown in FIG. 5, the portion of the support shaft 3 covered by the roller 2 is moved from the cooling passage 61 located in the middle of the rollers 2a and 2b to the left and right in the support shaft 3. A configuration may also be conceived in which a branch hole 61d is formed that branches and penetrates to the end of the support shaft 3 and that communicates from the cooling passage 61 inside the support shaft 3 to the rollers 2a and 2b in the center of the rollers 2a and 2b.

  Thus, by providing the vent hole 61d in the portion of the support shaft 3 covered with the rollers 2a and 2b, as shown by the arrow in FIG. 5, there is a slight gap between the support shaft 3 and the back surfaces of the rollers 2a and 2b. The flow of the exhaust air from the vent hole 61d is born in a clear clearance. As a result, the rollers 2a and 2b can be cooled by the cooling air. Therefore, it is possible to perform the repair process while keeping the rollers 2a and 2b in a low temperature state to some extent.

  The shape of the vent hole 61d may be circular or square, and one vent may be provided or a plurality of small holes may be provided. In FIG. 5, from the viewpoint of design, the cooling passage 61 penetrates the support shaft 3 and is closed at both ends by nuts N with lids. There is no problem as long as it extends from the center where the inlet 61a and the outlet 61b are provided to the positions of the left and right communication holes 61d.

DESCRIPTION OF SYMBOLS 1,10,20 ... Sheet metal restoration jig | tool 2, 2a, 2b, 20 ... Roller 3, 30 ... Support shaft 4 ... Support body 5 ... Electrode 6, 60, 61 ... Cooling passage 6a, 60a, 61a ... Inlet 6b, 60b, 61b ... discharge ports 6c, 60c, 61c ... flow path 61d ... vent 6n ... nozzle A ... repair surface N ... nut

Claims (2)

In the sheet metal repair jig that smoothes the sheet metal by heating and cooling the repair target position of the sheet metal,
A cylindrical roller made of a conductive material and serving as a heating means;
A roller support shaft that rotatably supports the roller with a cylindrical rotation shaft;
A support including an electrode electrically connected to the roller while supporting the roller support shaft;
A cooling passage serving as an air passage for discharging cooling air to the contact surface between the sheet metal repair target position and the roller, and
The cooling passage is formed in the roller support shaft and has a discharge port for discharging cooling air toward a contact surface between the sheet metal repair target portion and the roller. The sheet metal repair jig according to claim 1, wherein the roller is divided into a plurality of parts in the axial direction, and the discharge port is formed in a gap between the plurality of rollers.

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