JP4157248B2 - Flash welding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of a flash welding apparatus for joining large-section steel members for construction.
[0002]
[Prior art]
Conventionally, flash welding apparatuses are widely known and put into practical use. For example,
[0003]
(A) The flash welding apparatus disclosed in Japanese Patent Application Laid-Open No. 61-30287 is for butt welding the ends of preceding and succeeding metal strips in a steel process line. It is the structure connected with the jack which makes a trolley approach or separate.
[0004]
(B) The flash welding apparatus disclosed in Japanese Patent Application Laid-Open No. Sho 62-286682 is provided with a moving base and a fixed base on a common support base, each having an electrode for gripping a material to be welded, The flash welding is performed by moving forward toward the fixed base.
[0005]
(C) A flash welding apparatus disclosed in Japanese Patent Application Laid-Open No. 64-66073 is composed of a fixed electrode table and a moving electrode table provided with electrodes, a mechanism for correcting the movement amount on both sides of both, and detection of the movement amount It is the structure provided with the means.
[0006]
(D) In conventional general flash welding, as shown in FIG. 16A, the two workpieces a and b arranged opposite to each other are grasped by the fixed clamp c and the moving clamp d, respectively, and the fixed electrode e and the moving electrode f are further held. A large current is intermittently passed between the two materials to be welded a and b, and heated by a flash performed by abutting the ends of the two materials to be welded a and b as shown in FIG. 16B (flash process). Welding is performed by pressurizing the ends of the heated materials to be welded a and b in the material axis direction (upset process).
[0007]
As an apparatus for performing the flash welding as described above, conventionally, as illustrated in FIGS. 17 to 19, one end is fixed to a plurality of shift prevention shafts g (so-called guide shafts) fixed to a reaction force frame h. A fixed clamp frame k and a movable movable clamp frame m are provided, and a pressure jack n is installed between the movable clamp frame m and the reaction force frame h. A clamp jack p for driving the fixed clamp c and a drive jack q for the fixed electrode e are installed in an annular fixed clamp frame k. Similarly, a clamp jack s for driving the moving clamp d and a drive jack t for the movable electrode f are installed in the annular movable clamp frame m.
[0008]
[Problems to be solved by the present invention]
As shown in FIG. 19, the conventional flash device has a large distance y from the misalignment shaft g to the material to be welded and a large bending moment generated during upsetting. Therefore, in order to ensure welding accuracy, There was no choice but to enlarge the cross section of the member. In addition, there is a distance between the pressing point of the upsetting pressure jack n and the position of the clamping jacks p and s, and a large bending moment is generated in the clamping frames k and m during upsetting. m also tended to have a large cross-sectional structure.
[0009]
The conventional upset process is not load control but load control, and it is necessary to upset the displacement of the movable clamp frame m to be the same and pressurize the joint surfaces of the workpieces a and b uniformly. For this reason, a pair of clamp mechanisms are penetrated by a large-diameter misalignment shaft g (guide bar) so that the displacement of the movable clamp frame m is mechanically the same. The member has a large cross section so as to resist the bending moment.
[0010]
For example, in the flash welding apparatus disclosed in the above Japanese Patent Application Laid-Open No. 64-66073, a side bar that connects a fixed electrode base that forms a clamp frame and a movable electrode base is installed. The flash welding apparatus disclosed in Japanese Patent Application Laid-Open No. 62-286682 is also connected by a common support base so that the distance (displacement) between the moving base and the fixed base on the common support base forming the clamp frame is uniform. Has been.
[0011]
In the upset process, the above-described shaft and sidebar have a joining surface where the members to be welded are not orthogonal to the applied direction, and have an angle θ as shown in FIG. 20 and component forces u and w other than the applied direction. When this occurs, a function of preventing the displacement of the clamp position is greatly expected so that a force that forcibly deforms can be applied. For this reason, what is required of the shaft and the sidebar is generally a rigid design that requires not only strength but also rigidity, which also contributes to an increase in the size of the welding apparatus.
[0012]
As a result, the flash welding apparatus increases in weight, exceeds the limit of being portable, and is limited to being installed and used in a factory. Specifically, when welding a steel frame having a cross section of 200 cm ² , the weight of the conventional flash welding apparatus is about 50 tons, and it is impossible to move the welding apparatus to a construction site or the like. In addition, since the flash welding apparatus is manufactured by a combination of machined members, the flash welding apparatus having a weight of 50 tons is very expensive.
[0013]
Next, the flash welding apparatus described in Japanese Patent Application Laid-Open No. 61-30287 is composed of a leading carriage and a trailing carriage for gripping a metal strip, and omits a common support base. The upset process is performed with a jack connected to the carriage, but the metal strip is gripped by the electrodes, so that the clamp part becomes large, which is a factor that hinders the downsizing and weight reduction of the welding apparatus. In addition, since the clamp position and the upset jack are separated from each other, and a bending moment is generated in the preceding carriage and the trailing carriage constituting the clamp frame, there is a problem in increasing the size by using a large cross-section member to resist this. There is a point. In other words, it is unclear how much the leading and trailing carriages are subjected to the vertical restraining force on the rails on the floor, but when the component forces u and w as shown in FIG. A huge weight is required to prevent displacement due to the own weight of the bogie and the trailing bogie.
[0014]
For the above reasons, the conventional flash welding apparatus can only be used in a limited place in the factory, and it has been impossible to carry it to the site of the construction site and use it easily.
[0015]
Therefore, the object of the present invention is applicable to flash welding of a large- section steel member for construction, and has been reduced in size and weight to such an extent that it can be transported, and improved to a construction that can be used at a construction site. To provide an apparatus.
[0016]
[Means for Solving the Problems]
As a means for solving the above-mentioned problems of the prior art, a flash welding apparatus according to the invention described in claim 1 is a flash welding apparatus for a large-section steel member for construction,
A flash welding device for a large cross-section steel member for construction,
A clamp member having gripping a large section steel members for buildings to be welded by the action of the clamping jacks, a plurality of interconnected between the two clamp members disposed facing gripping a large cross-section steel members for buildings to be welded It consists of a combination of a linear drive actuator and an electrode that is directly attached to a large cross-section steel member for construction and that feeds power.
The linear drive actuator is configured to be capable of synchronous displacement control for a flash process and an upset process, and a connecting portion between the linear drive actuator and the clamp member is electrically insulated. .
[0017]
The invention according to claim 2 is the flash welding apparatus according to claim 1,
Clamping member in the form of an annular surrounding the outer periphery of the large cross section steel members for buildings to be welded, least also have out possible opening large section steel members for buildings in the transverse direction, and the opening divided The closed member is configured to be detachable by a pin mechanism.
[0018]
The invention according to claim 3 is the flash welding apparatus according to claim 1,
Clamping member in the form of a non-cyclic, has a configuration to grasp the portion of large cross section steel members for buildings to be welded individually, between the individual clamping members are oppositely disposed gripping a large section steel members for buildings to be welded Are connected to each other by a linear drive actuator.
[0019]
The invention according to claim 4 is the flash welding apparatus according to claim 1,
The connection between the clamp member and the linear drive actuator is a pin connection, and the large-section steel member for construction to be welded can be moved in the horizontal direction and supported with a restraining jig that prevents displacement in the horizontal direction. It is supported by a stand.
[0020]
The invention according to claim 5 is the flash welding apparatus according to claim 1,
The connecting portion between the clamp member and the linear drive actuator has a fixed structure, and the linear drive actuator has a structure that resists a bending moment.
[0021]
The invention according to claim 6 is the flash welding apparatus according to claim 1,
The linear drive type actuator is provided with a servo valve and a displacement sensor for detecting a stroke so that the displacement of each processing unit for processing the measurement signal of the displacement sensor and each linear drive type actuator according to the command of the processing unit are the same. A control device is constituted by a servo controller that performs servo control.
[0022]
Embodiments and Examples of the Invention
1 and 2 show an embodiment of a flash welding apparatus according to the first, second, fourth, and sixth aspects corresponding to an H-section steel.
[0023]
This is a flash welding apparatus applied to butt welding of a large-section steel member for construction, and shows H-section steels 1 and 2 as an example of the large-section steel member for construction to be welded. In this flash welding apparatus, the clamp members 3 and 4 for holding the two H-shaped steels 1 and 2 by the action of a jack for clamping, and the two H-shaped steels 1 and 2 to be welded are gripped and arranged opposite to each other. A plurality of linear drive type actuators 5 (hereinafter simply referred to as actuators 5) in which the clamp members 3 and 4 are connected to each other by pins 20; The electrode 6 and the clamp mechanism are separated from each other without the side bar and the guide shaft.
[0024]
With respect to the connecting portion by the pin 20, the connecting portion between the actuator 5 and the clamp members 3 and 4 is electrically insulated so that no current flows through the actuator 5. As the means, an insulating pin covered with an insulating material such as ceramic or epoxy resin is used.
[0025]
As is apparent from FIG. 2, the clamp members 3 and 4 have an annular shape surrounding the outer periphery of the H-section steel 2 (and 1) to be welded as a whole, but at least the H-section steel 2 in the lateral direction (FIG. 2). Then, a horseshoe-shaped main member (clamp frame) 4a having an opening that can be taken in and out in the vertical direction and a closing member 4b that is divided so as to close the opening are configured to be detachable by a pin mechanism 7 ( Invention of Claim 2). Therefore, the work of attaching to and removing from the long H-shaped steels 1 and 2 can be performed relatively easily from the lateral direction.
[0026]
As a means for gripping the H-section steel 2 (and 1), FIG. 2 shows that the main member 4a of the clamp member 4 (and 3) is arranged on one side at a right angle with respect to the center position of the web of the H-section steel 2. A clamping jack 8 is installed, a reaction force receiver 9 is installed on the opposite side, and the web of the H-section steel 2 is sandwiched and grasped. Reference numeral 15 in FIG.
[0027]
The actuator 5 is a hydraulic cylinder as an example, and is, for example, a hydraulic cylinder capable of displacement control by synchronous control. The actuator 5 is configured to be able to perform synchronous displacement control for a flush process and an upset process. Generation of misalignment is prevented by controlling the displacement of each actuator 5, and the side bar and the guide shaft are unnecessary.
[0028]
That is, as exemplified in FIG. 3, the actuator 5 includes a servo valve 11 and a displacement sensor 12 such as a potentiometer for detecting a stroke. A control device includes a processing device 13 such as a personal computer that processes the measurement signal of the displacement sensor 12 and a servo controller 14 that performs servo control so that the displacements of all the actuators 5 are the same according to a command from the processing device 13. It is comprised (invention of Claim 6). In the flash process, it is necessary to give a vibration of about 10 Hz, but in this case, control is performed so that the same displacement is obtained.
[0029]
As shown in FIG. 10, the electrode 6 has a structure that is independent of the structure such as a clothespin, and is a flange portion that is closer to the joint surface (welding position) 10 than the clamp members 3 and 4 of the H-shaped steels 1 and 2 directly. It is attached to.
[0030]
The flash welding apparatus having the above configuration is usually transported and used in a state where the two clamp members 3 and 4 and the actuator 5 are connected, and the total weight thereof is about 2 tons. Therefore, it can be easily and easily loaded onto trucks with small heavy machinery, so it is highly portable. If necessary, it can be transported to the construction site and used for butt welding of various large steel parts for construction at the site. Can be used.
[0031]
4-6 has shown embodiment corresponding to a steel pipe.
[0032]
In this flash welding apparatus, since the welding objects are the steel pipes 1 ′ and 2 ′, the shape of the pressing pad and the reaction force receiver 9 of the clamp jack 8, the support 15 and the shape of the electrode 6, and the structure thereof are illustrated. Although inevitably different from the embodiment of FIG. 1 and FIG. 2, other configurations are almost common.
[0033]
In particular, the structure of the electrode 6 is a band 6a wound about one turn around the outer periphery of the steel pipe 2 '(and 1') as shown in FIG. 6A, and both ends thereof are configured to be detachable by a fastening mechanism 6c, or FIG. As shown in FIG. 6B, a pair of bands 6b wound around the outer circumference of the steel pipe 2 ′ (and 1 ′) for about a half turn is combined, and each end is configured to be detachable by a fastening mechanism 6c selectively. Adopted.
[0034]
Next, although FIG. 7 and FIG. 8 are embodiment corresponding to the same steel pipe, the example from which the shape and structure of the clamp members 3 and 4 differ is shown.
[0035]
As specifically shown in FIG. 8, the clamp members 3 and 4 of the present embodiment include two semicircular rings 4 k that are substantially equal to a circular ring that surrounds the outer periphery of the steel pipe 2 ′ (and 1 ′). Both ends of 4k are overlapped and connected in a detachable manner by a pin mechanism 7. A plurality of clamping jacks 8 are installed in a semicircular portion in a radially inward arrangement, and a plurality of reaction force receivers 9 are arranged in a symmetrical arrangement in the remaining semicircular portion.
[0036]
Next, FIGS. 9-11 has shown embodiment corresponding to the H-section steel based on invention of Claim 3. FIG.
[0037]
That is, the clamp members 3 ′ and 4 ′ have a non-annular form, and are configured to individually hold the upper and lower flanges of the two H-shaped steels 1 and 2 to be welded. As the means, the clamp member 4 ′ (and 3 ′) is configured to hold the upper and lower flanges of the H-section steel 2 as shown in FIG. 11, and the inner surface of each flange is arranged symmetrically on both sides of the web. A clamping jack 8 is installed so as to press and hold the.
[0038]
As described above, the clamp members 3 'and 4' which are opposed to each other by grasping the upper and lower flanges of the H-shaped steels 1 and 2 are those which grasp the upper flange and those which grasp the lower flange. Are connected by an actuator 5.
[0039]
Therefore, the mode of use and the welding function are the same as those of the flash devices of the above-described embodiments.
[0040]
Next, FIG. 12 and FIG. 13 show an embodiment of the invention described in claim 4.
[0041]
As the configuration of the flash welding apparatus, the one described in FIGS. 7 to 11 is illustrated. However, as a common matter, the flash welding apparatus according to claim 1, wherein two clamp members 3, 4 are used. (And 3 ′, 4 ′) and both ends of the actuator 5 are movable pin connections, and when the component forces u and w described with reference to FIG. An embodiment for ensuring welding accuracy is shown.
[0042]
That is, as a support means for the two H-section steels 1 and 2 to be welded, the moving-side H-section steel 2 is formed on the upper surface of a plurality of support bases 16 that are arranged in a single row with a uniform horizontal level of height. In connection with this, a moving roller 17 is installed and supported so as to be movable only in the horizontal direction. Further, both of the support base 16 on the moving side and the stationary side are provided with a restraining jig 18 configured to prevent the positional deviation of the H-shaped steels 1 and 2 in the lateral direction (perpendicular to the material axis). It is said.
[0043]
Therefore, even when the joining end surfaces of the H-section steels 1 and 2 are not right angles and there is a possibility that a component force may be generated during upsetting, the high-precision flash welding can be performed by strongly resisting the component force. (Invention of claim 4). As an example, the restraining jig 18 has a configuration in which a high-rigidity steel plate or the like is vertically fixed.
[0044]
Finally, FIGS. 14 and 15 show an embodiment of the invention as claimed in claim 5.
[0045]
Although the structure described in FIGS. 7 and 8 is shown as the configuration of the flash welding apparatus, it should be understood that the flash welding apparatus is the flash welding apparatus described in claim 1 as a common matter.
[0046]
The feature of this flash welding apparatus is an embodiment that ensures welding accuracy when the component forces u and w as described with reference to FIG. 20 are generated during upsetting, and the two clamping members 3, 4 (and 3 ′, 4 ′) and the both ends of the actuator 5 are firmly fixed structures, and the linear drive actuator 5 itself is also a rigid structure that strongly resists a bending moment.
[0047]
In addition, the large cross-section steel member for construction to which the flash welding apparatus according to the present invention is applied is not limited to the above-mentioned H-section steel and circular steel pipe, but is used as a construction member such as a square steel pipe and a box-shaped cross-section member. It can be dealt with by changing the shape and structure of the clamp member, the arrangement of the jack for clamping, the pressing pad, the form structure of the reaction force receiver, and the like.
[0048]
[Effects of the present invention]
The flash welding apparatus according to the first to sixth aspects of the present invention can be applied to flash welding of large cross-section steel members for construction , and has a structure that is particularly small and light enough to be portable. Therefore, it can be transported to the construction site as needed and used efficiently at the site.
[Brief description of the drawings]
FIG. 1 is an elevational view showing an embodiment of a flash welding apparatus according to the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is an explanatory diagram of displacement control synchronized with an actuator.
FIG. 4 is an elevation view showing a different embodiment of the flash welding apparatus according to the present invention.
5 is a BB arrow view of FIG. 4;
FIGS. 6A and 6B are front views showing different embodiments of electrodes. FIGS.
FIG. 7 is an elevational view showing a different embodiment of the flash welding apparatus according to the present invention.
8 is a view taken along the line CC in FIG.
FIG. 9 is an elevational view showing a different embodiment of the flash welding apparatus according to the present invention.
10 is a view taken in the direction of arrows EE in FIG. 9;
FIG. 11 is a view taken along the line DD in FIG. 9;
FIG. 12 is an elevational view showing a different embodiment of the flash welding apparatus according to the present invention.
FIG. 13 is a plan view of FIG.
FIG. 14 is an elevation view showing a different embodiment of the flash welding apparatus according to the present invention.
15 is a view taken along the line FF in FIG.
FIGS. 16A to 16C are explanatory views showing main steps of conventional general flash welding. FIGS.
FIG. 17 is a front view of a conventional flash welding apparatus.
18 is a left side view of FIG.
19 is a cross-sectional view taken along line GG in FIG.
FIG. 20 is an explanatory diagram showing a cause of generation of a component force in an upset process.
[Explanation of symbols]
1, 2 H-section steel (large cross-section steel member for construction )
1 ', 2' steel (large section steel members for buildings)
8 Clamp Jack 3, 4 Clamp Member 3 ′, 4 ′ Clamp Member 5 Actuator 6, 6 ′ Electrode 4b Closing Member 18 Restraint Jig 16 Support Base 11 Servo Valve 12 Displacement Sensor 14 Servo Controller

Claims (6)

A flash welding device for a large cross-section steel member for construction,
And a clamp member having gripping a large section steel members for buildings to be welded by the action of the clamping jacks, plurality of interconnected between the two clamp members disposed facing gripping a large cross-section steel members for buildings to be welded It consists of a combination of a linear drive actuator and an electrode that is directly attached to a large cross-section steel member for construction and that feeds power.
The linear drive actuator is configured to be capable of synchronous displacement control for a flash process and an upset process, and a connecting portion between the linear drive actuator and the clamp member is electrically insulated. , Flash welding equipment. Clamping member in the form of an annular surrounding the outer periphery of the large cross section steel members for buildings to be welded, least also have out possible opening large section steel members for buildings in the transverse direction, and the opening divided The flash welding apparatus according to claim 1, wherein the closed closing member is configured to be detachable by a pin mechanism. Clamping member in the form of a non-cyclic, has a configuration to grasp the portion of large cross section steel members for buildings to be welded individually, between the individual clamping members are oppositely disposed gripping a large section steel members for buildings to be welded The flash welding apparatus according to claim 1, wherein the two are connected to each other by a linear drive type actuator. The connection between the clamp member and the linear drive actuator is a pin connection, and the large-section steel member for construction to be welded can be moved in the horizontal direction and supported with a restraining jig that prevents displacement in the horizontal direction. The flash welding apparatus according to claim 1, wherein the flash welding apparatus is supported by a table. 2. The flash welding apparatus according to claim 1, wherein a connecting portion between the clamp member and the linear drive actuator has a fixed structure, and the linear drive actuator has a structure that resists a bending moment. The linear drive type actuator is provided with a servo valve and a displacement sensor for detecting a stroke so that the displacement of each processing unit for processing the measurement signal of the displacement sensor and each linear drive type actuator according to the command of the processing unit are the same. The flash welding apparatus according to claim 1, wherein a control device is constituted by a servo controller that performs servo control.

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