JP2001334367A - Method and equipment for welding frame for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge welding strength, to surely judge welding strength, to speedily judge welding strength, to improve welding precision and to improve welding working efficiency. SOLUTION: In the method for welding a member 3 on one side and a member 6 on the other side by setting on a jig the member 3 on one side and the member 6 on the other side of frames to be welded for vehicle, the propriety of the welding is judged by a pressure detected when pushing the member 3 on one side and the member 6 on the other side each other, by an energizing time to the member 3 on one side and the member 6 on the other side, by a displacement quantity (quantities) from a prewelding position(s) to a postwelding position(s) of either the member 3 on one side or the member 6 on the other side or both of them and by the displacement quantity of the member 6 on another side, which is obtained when applying a load by a prescribed quantity in the direction in which the member 6 on the other side is apart from the member 3 on one side after energizing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for welding a vehicle frame.

[0002]

2. Description of the Related Art Although the number of a conventionally known publication is unknown, one side member and the other side member of a vehicle frame to be welded are set on a jig, and the one side member and the other side member are welded. In the method, welding of a vehicle frame is performed by judging whether welding is appropriate or not based on a pressure detected when the one side member and the other side member come into contact with each other and an energization time to the one side member and the other side member. The method is known.

[0003]

The above-mentioned prior art has a problem in that welding is performed according to a certain standard, and then the suitability of the welding is judged based on the tone when a welded portion is hit by a skilled worker. That is, there is a problem that the accuracy of the determination is low because the judgment is made based on intuition, and a problem that the efficiency is low and the cost is high because only the skilled person performs the judgment.
If the judgment can be made mechanically, accuracy and efficiency can be improved.

[0004]

The object of the present invention is to facilitate the determination of the welding strength, to ensure the determination of the welding strength, to speed up the determination of the welding strength, to improve the welding accuracy, and to improve the welding work efficiency.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for setting one side member 3 and the other side member 6 of a vehicle frame to be welded to a jig and welding the one side member 3 and the other side member 6 to each other. The pressure detected when the one-side member 3 and the other-side member 6 are pressed against each other, the energization time to the one-side member 3 and the other-side member 6, the one of the one-side member 3 and the other-side member 6, The displacement amount after welding from one or both before welding and the displacement amount of the other side member 6 when a predetermined amount of load is applied in a direction in which the other side member 6 separates from the one side member 3 after energization. This is a method for welding a vehicle frame that determines whether welding is appropriate. The present invention provides a method of setting the upper backrest frame 3 to be welded and the headrest guide 6 on a jig and welding the upper backrest frame 3 and the headrest guide 6 to each other. , Pressure applied to the upper backrest frame 3 and the headrest guide 6, displacement of one or both of the upper backrest frame 3 and the headrest guide 6 from before welding to after welding. And a displacement of the headrest guide 6 when a predetermined amount of load is applied in a direction in which the headrest guide 6 separates from the backrest upper frame 3 after energization, to determine whether welding is appropriate or not. This is a welding method. In the present invention, the backrest upper frame 3 and the headrest guide 6 to be welded are set on a jig, the backrest upper frame 3 and the headrest guide 6 are moved by a set pressure, and electricity is supplied for a set predetermined time. The displacement amount after welding is detected before and / or before welding one or both of the upper frame 3 and the headrest guide 6, and when a predetermined displacement amount is detected, the energization is temporarily stopped, and after a lapse of a predetermined time, pressurization for determination is performed. A predetermined amount of moment load is applied by the device 17 in a direction in which the headrest guide 6 separates from the upper backrest frame 3, and the displacement of the headrest guide 6 at this time is detected by the displacement meter 16 to judge whether welding is appropriate. This is a method for welding a vehicle frame. The present invention is a method for welding a vehicle frame in which a predetermined current is supplied between one side member (backrest upper frame) 3 and the other side member (headrest guide) 6 for a predetermined time. The present invention relates to a vehicle frame 3 to be welded on one side 3
A jig base 1 having a base-side electrode 2 for mounting one side member 3 of the other side member 6 and the other side member 6 mounted vertically above and above the one side member 3 are provided. It has a middle electrode member 5 pressed against one side member 3 by pressure, and an upper electrode member 10 that conducts electricity between the other side member 6, one side member 3 and the base side electrode 2 via the middle electrode member 5. In the vicinity of the upper electrode member 10, a displacement meter 15 for the upper electrode member for detecting a displacement amount of the other member 6 before and after welding.
Is provided near the middle electrode member 5 to detect a displacement amount of the middle electrode member 5 or the other side member 6 with respect to a load applied to the other side member 6 after welding in a direction away from the one side member 3. This is a welding device for a vehicle frame provided with a total of 16. The present invention provides a jig base 1 having a base-side electrode 2 for mounting a backrest upper frame 3 to be welded,
A middle electrode member 5 for pressing a headrest guide 6 which is vertically movable and mounted above the backrest upper frame 3 against the backrest upper frame 3 with a predetermined pressure; and a headrest guide 6 and a backrest via the middle electrode member 5. An upper electrode member (10) that conducts electricity between the upper frame (3) and the base-side electrode (2);
In the vicinity of the upper electrode member 10, there is provided an upper electrode member displacement meter 15 for detecting a displacement amount of the upper electrode member 10 from before welding to after welding of the headrest guide 6, and near the middle electrode member 5 after welding. A vehicle frame welding apparatus provided with a displacement gauge 16 for detecting a displacement amount of the middle electrode member 5 or the headrest guide 6 with respect to a moment load applied to the headrest guide 6 in a direction away from the backrest upper frame 3; It was done.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of an apparatus capable of implementing the method of the present invention will be described. Reference numeral 1 denotes a jig base, and a plurality of base-side electrodes 2 are provided at appropriate predetermined locations on the jig base 1. Above the base-side electrode 2, a one-side member (backrest upper frame) 3, which constitutes a part of the vehicle frame, is placed and fixed. Although illustration is omitted, it is more preferable that the position of the upper backrest frame 3 is not shifted by a clamp or the like.

A middle electrode member 5 is provided above the base-side electrode 2. The middle electrode member 5 is for mounting the other side member (headrest guide) 6 constituting a part of the vehicle frame to be welded to the one side member (backrest upper frame) 3. Although omitted, a support member for inserting the pillar of the headrest for vertical adjustment is attached.

The headrest guide 6 is formed in a tubular shape, and the middle electrode member 5 is formed in an axial shape so that the headrest guide 6 can be inserted and mounted. However, the shape of the headrest guide 6 is arbitrary, and The electrode member 5 only needs to be able to mount the headrest guide 6, and is configured in accordance with the shape of the headrest guide 6.

The middle electrode member 5 is provided on the backrest upper frame 3.
The headrest guide 6 is provided to be vertically movable by a vertical mounting mechanism 7 from a working position where the headrest guide 6 is brought into contact with and pressed to a standby mounting position above the backrest upper frame 3 by a predetermined distance. The structure of the up-and-down mechanism 7 is arbitrary.

The upper electrode member 10 is provided above the middle electrode member 5. The upper electrode member 10 is formed in a downward U-shape when viewed from the side, and is brought into contact with the upper surface of the middle electrode member 5 exposed on both sides of the inserted headrest guide 6.

That is, the upper electrode member 10 contacts and energizes the middle electrode member 5 so that a current flows between the headrest guide 6 and the backrest upper frame 3.

The upper electrode member 10 is configured to be vertically movable with respect to the middle electrode member 5, and the upper electrode pressing device 11 lowers the middle electrode member 5 at a predetermined pressure. Is provided so as to be pressed. The upper electrode pressurizing device 11 has an arbitrary configuration, and presses the middle electrode member 5 through which the headrest guide 6 has been inserted downward at a predetermined pressure by priority with respect to the vertically moving mechanism 7 so that the headrest guide 6 is moved to the upper backrest frame 3. Weld by applying current while pressing against.

The upper electrode member 10 is provided with an upper electrode member displacement gauge 15 for detecting the vertical position of the upper electrode member 10, and detects how much the upper electrode member 10 has dropped during welding.

That is, since the headrest guide 6 and the backrest upper frame 3 fuse with each other during welding, the upper electrode member 10
Descends from the height in contact with the middle electrode member 5 before welding, so that those skilled in the art refer to the amount of this decrease as the upsetting displacement,
When the upsetting displacement amount is equal to or more than a certain value, it is determined that welding is good. In particular, in the embodiment, the welding projection 11 is provided on the backrest upper frame 3, and the welding projection 11 is fused with the headrest guide 6.
When the displacement is equal to the height of 1, welding is completed.

Thus, a displacement meter 16 for the middle electrode member for detecting the vertical position of the middle electrode member 5 is provided on the base side of the middle electrode member 5, and a headrest guide 6 is provided on the base side of the middle electrode member 5. A determining pressurizing device 17 capable of applying a load in a direction away from the backrest frame 3 is provided. That is, a load is applied to the headrest guide 6 by the determining pressurizing device 17, and the headrest guide 6 (the middle electrode member 5) before and after the load is applied by the displacement meter 16 for the middle electrode member.
Is detected, and if the displacement of the headrest guide 6 (the middle electrode member 5) is within a predetermined value, the welding strength is secured.

In this case, the displacement meter 16 for the middle electrode member may be configured to directly detect the displacement amount of the headrest guide 6, but the displacement amount of the headrest guide 6 may be small. It is estimated by detecting the variation of the middle electrode member 5 as in the embodiment.

The load applied by the determination pressurizing device 17 is such that the headrest guide 6 is
Moment load in the direction away from
This is suitable because the welding strength can be accurately determined.

The detection / pressing device 17 is constituted by an arbitrary structure such as a fluid cylinder such as air or oil pressure, and is configured to pull the base of the middle electrode member 5 downward. In addition to the detection of the amount of lowering of the upper electrode member 10 and the withstand load of the fixed portion of the headrest guide 6, the energizing time, the pressure and the energizing current value of the upper electrode pressurizing device 11 are also detected, and the overall welding is performed. Judge the suitability of In this regard, in the embodiment, the pressing pressure of the upper electrode member 10, the load-bearing load of the fixed portion of the headrest guide 6, the energizing time and the energizing current value for welding are also automatically controlled. In the figure,
Reference numeral 18 denotes a cross wire, 19 denotes an electrode for welding the cross wire 18, and 20 denotes a cylinder for applying pressure to the electrode 19. In the embodiment, one side member ( The backrest upper frame) 3 can be stably mounted, which is preferable.

[0019]

Next, the operation will be described. One side member (backrest upper frame) 3 is placed and fixed above the base-side electrode 2 of the jig base 1.

Next, the other side member (headrest guide) 6 formed in a cylindrical shape is inserted into and mounted on the middle electrode member 5, which stands by at a predetermined interval above the backrest upper frame 3.

Next, the outer periphery of the headrest guide 6 is brought into contact with the upper backrest frame 3 by lowering the middle electrode member 5.

In this state, the upper electrode member 10 is lowered by the upper electrode pressing device 11 to contact the upper surface of the middle electrode member 5 exposed on both sides of the headrest guide 6, and then the upper electrode pressing device 11 As a result, the upper electrode member 10 descends while applying a predetermined pressure, and conducts electricity while descending.

Thus, the headrest guide 6 is fixed to the upper backrest frame 3 by welding.

The upper electrode pressurizing device 11 automatically controls the lowering pressure and the current application time of the predetermined current, and stops the application and pressurization when the set value is reached.

In this case, since the upper electrode member 10 is provided with the displacement meter 15 for the upper electrode member 10 for detecting the vertical position of the upper electrode member 10, the upper electrode member 10 is connected to the upper electrode member 10 during welding. Detect how far down.

A displacement meter 16 for detecting the vertical position of the middle electrode member 5 is provided on the base side of the middle electrode member 5, and a displacement meter 16 for the middle electrode member is provided on the base side of the middle electrode member 5. The headrest guide 6 is provided with a judgment pressurizing device 17 capable of applying a predetermined amount of load in a direction away from the backrest upper frame 3. The mounting strength with the headrest guide 6 is determined.

Accordingly, while automatically controlling the pressing pressure for pressing the headrest guide 6 against the upper backrest frame 3 and the duration of application of a predetermined current, the upper electrode member 10 and the middle electrode member displacement meter 16 are used to control the upper electrode member 10. In addition, the lowering amount (upsetting amount) of the middle electrode member 5 is detected to determine whether welding is appropriate. In addition, the displacement amount of the middle electrode member 5 with respect to the load applied by the determining pressurizing device 17 is determined by the middle electrode member. By detecting the displacement with the displacement meter 16, the suitability of the welding is comprehensively determined.

That is, the basic conditions for welding are satisfied by the pressing pressure for pressing the headrest guide 6 against the upper backrest frame 3 and the duration of application of the predetermined current, so that the headrest guide 6 and the upper backrest frame 3 are mutually welded. Since the upper electrode member 10 descends, the lowering amount is detected by the upper electrode member displacement meter 15, and similarly, the lowering amount of the middle electrode member 5 is detected by the middle electrode member displacement meter 16. Satisfies a predetermined setting criterion, the welding operation ends.

When a predetermined time has elapsed while the backrest upper frame 3 and the headrest guide 6 are mounted on the jig, the headrest guide 6 is moved away from the backrest upper frame 3 by the determining pressurizing device 17. A load is applied, and the middle electrode member 5 is
Is less than a predetermined value, it means that sufficient welding strength has been secured.

[0030]

According to the present invention, one side member 3 and the other side member 6 of a vehicle frame to be welded are set on a jig.
In the method of welding the other side member 6 with the one side member 3,
And the pressure detected when the other member 6 is pressed against each other, the energization time to the one member 3 and the other member 6,
A predetermined amount of load is applied in a direction in which one or both of one or both of the one-side member 3 and the other-side member 6 before and after welding, and after the energization, the other-side member 6 is separated from the one-side member 3. In this method, the welding of the vehicle frame is performed by judging whether welding is appropriate or not based on the displacement of the other member 6 when the welding is performed. Therefore, the displacement (upsetting amount) after welding from before welding is detected. Judgment of welding during work is judged, and in addition to this, a load is applied and the displacement is detected to judge the suitability of welding comprehensively, and the judgment accuracy is improved. Work can be made much easier. The present invention
The upper backrest frame 3 to be welded and the headrest guide 6 were set on a jig, and the upper backrest frame 3 and the headrest guide 6 were pressed against each other in a method of welding the upper backrest frame 3 and the headrest guide 6. The detected pressure, the energizing time to the upper backrest frame 3 and the headrest guide 6, the amount of displacement of one or both of the upper backrest frame 3 and the headrest guide 6 before and after welding, A vehicle frame welding method for judging whether welding is appropriate based on a displacement amount of the headrest guide 6 when a predetermined load is applied in a direction in which the headrest guide 6 separates from the backrest upper frame 3 later. Therefore, in the work requiring the mounting (fixing) strength of the portion of the upper backrest frame 3 and the headrest guide 6, To improve the constant accuracy, improve the reliability of the product. In the present invention, the backrest upper frame 3 and the headrest guide 6 to be welded are set on a jig, the backrest upper frame 3 and the headrest guide 6 are moved by a set pressure, and electricity is supplied for a set predetermined time. The displacement amount after welding is detected before and / or before welding one or both of the upper frame 3 and the headrest guide 6, and when a predetermined displacement amount is detected, the energization is temporarily stopped, and after a lapse of a predetermined time, pressurization for determination is performed. A predetermined amount of moment load is applied by the device 17 in a direction in which the headrest guide 6 separates from the upper backrest frame 3, and the displacement of the headrest guide 6 at this time is detected by the displacement meter 16 to judge whether welding is appropriate. In this method, the accuracy of the determination is improved and the reliability of the product is improved. The present invention is a method for welding a vehicle frame in which a predetermined current is applied between the one side member (backrest upper frame) 3 and the other side member (headrest guide) 6 for a predetermined time. According to a predetermined procedure, a welding operation for improving the reliability of the product can be easily performed. The present invention relates to a jig base 1 having a base-side electrode 2 for mounting one of the one-side member 3 of a vehicle frame to be welded and the other-side member 6 of the other-side member 6.
A middle electrode member 5 for pressing the other side member 6 mounted vertically above the one side member 3 onto the one side member 3 with a predetermined pressure, and the other side member via the middle electrode member 5 6 and an upper electrode member 10 that conducts electricity between the one-side member 3 and the base-side electrode 2, and detects a displacement amount of the other-side member 6 before and after welding in the vicinity of the upper electrode member 10. An upper electrode member displacement gauge 15 is provided, and in the vicinity of the middle electrode member 5, the middle electrode member 5 or the other member 6 against a load applied to the other member 6 after welding in a direction away from the one member 3. This is a welding device for a vehicle frame provided with a displacement meter 16 for detecting the displacement amount of the workpiece, and therefore, with a simple configuration, the displacement amount (upsetting amount) from before welding to after welding can be detected and used during work. Judge whether welding is appropriate or not. Detection comprehensively can propriety determination of welding, improved determination accuracy, also the determination operations following the welding operation to extremely facilitate the work because it. The present invention provides a jig base 1 having a base-side electrode 2 on which a backrest upper frame 3 to be welded is mounted, and a headrest guide 6 which is vertically movable and mounted above the backrest upper frame 3 at a predetermined pressure. Middle electrode member 5 pressed against backrest frame 3
A headrest guide 6, an upper electrode member 10 for conducting electricity between the upper backrest frame 3 and the base-side electrode 2 via the middle electrode member 5, and a headrest guide 6 near the upper electrode member 10. The upper electrode member displacement meter 15 for detecting the amount of displacement of the upper electrode member 10 before and after welding is provided, and the headrest guide 6 after welding is attached to the backrest upper frame 3 near the middle electrode member 5. Since the present invention is a welding apparatus for a vehicle frame provided with a displacement meter 16 for the middle electrode member 5 for detecting a displacement amount of the middle electrode member 5 or the headrest guide 6 with respect to a moment load applied in a direction away from the vehicle, it is simple. With a simple configuration, the displacement amount (upsetting amount) before and after welding is detected to judge the suitability of welding during work, and in addition to this, a load is applied and the displacement amount is detected to comprehensively weld. of Not be determined to improve the determination accuracy, also the determination operations following the welding operation to extremely facilitate the work because it.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a welding device.

FIG. 2 is a perspective view before the welding.

FIG. 3 is a perspective view showing a state where a middle electrode member and a headrest guide are lowered.

FIG. 4 is a perspective view of a welding (pressing) state by an upper electrode member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Jig base, 2 ... Base side electrode, 3 ... Backrest upper frame, 5 ... Middle electrode member, 6 ... Headrest guide, 7 ...
Up / down mechanism, 10: upper electrode member, 11: upper electrode pressing device,
15: Displacement gauge for upper electrode member, 16: Displacement gauge for middle electrode member, 17: Pressurizing device for judgment, 18: Cross wire, 19
... electrodes, 20 ... cylinders.

Claims (6)

[Claims] 1. A method of setting one side member 3 and the other side member 6 of a vehicle frame to be welded on a jig and welding the one side member 3 and the other side member 6 in the method of welding the one side member 3 and the other side member. The pressure detected when the members 6 are pressed against each other, the energization time to the one-side member 3 and the other-side member 6, and the welding before the welding of one or both of the one-side member 3 and the other-side member 6 It is determined whether welding is appropriate based on the subsequent displacement amount and the displacement amount of the other-side member 6 when a predetermined amount of load is applied in a direction in which the other-side member 6 is separated from the one-side member 3 after energization. Welding method for vehicle frames. 2. A method of setting a backrest upper frame 3 to be welded and a headrest guide 6 in a jig, and welding the backrest upper frame 3 and the headrest guide 6 to each other.
The pressure detected when the upper backrest frame 3 and the headrest guide 6 are pressed against each other, the energization time to the upper backrest frame 3 and the headrest guide 6, and one of the upper backrest frame 3 and the headrest guide 6 Alternatively, the headrest guide 6 when a predetermined amount of load is applied in a direction in which the headrest guide 6 separates from the backrest upper frame 3 after the current is supplied and the displacement amount before and after welding.
A method for welding a vehicle frame, which determines whether welding is appropriate based on the displacement of the vehicle frame. 3. A backrest upper frame 3 and a headrest guide 6 to be welded are set on a jig, the backrest upper frame 3 and the headrest guide 6 are moved by a set pressure, and electricity is supplied for a set predetermined time. The displacement amount after welding is detected before or after welding one or both of the upper frame 3 and the headrest guide 6, and when a predetermined displacement amount is detected, the power supply is stopped once, and after a lapse of a predetermined time, an additional load for determination is applied. A predetermined amount of moment load is applied by the pressure device 17 in a direction in which the headrest guide 6 separates from the backrest upper frame 3, and the displacement of the headrest guide 6 at this time is detected by the displacement meter 16 to determine whether welding is appropriate. Method for welding vehicle frames. 4. The method according to claim 1, 2 or 3.
, A predetermined current is applied between one side member (backrest upper frame) 3 and the other side member (headrest guide) 6 for a predetermined time. 5. One side member 3 of a vehicle frame to be welded.
A jig base 1 having a base-side electrode 2 for mounting one side member 3 of the other side member 6 and the other side member 6 mounted vertically above and above the one side member 3 are provided. It has a middle electrode member 5 pressed against one side member 3 by pressure, and an upper electrode member 10 that conducts electricity between the other side member 6, one side member 3 and the base side electrode 2 via the middle electrode member 5. In the vicinity of the upper electrode member 10, a displacement meter 15 for the upper electrode member for detecting a displacement amount of the other member 6 before and after welding.
Is provided near the middle electrode member 5 to detect a displacement amount of the middle electrode member 5 or the other side member 6 with respect to a load applied to the other side member 6 after welding in a direction away from the one side member 3. A welding device for a vehicle frame provided with a total of 16. 6. A jig base 1 having a base-side electrode 2 on which a backrest upper frame 3 to be welded is mounted, and a headrest guide 6 mounted vertically above and below the backrest upper frame 3 at a predetermined pressure. A middle electrode member 5 pressed against the backrest upper frame 3, and an upper electrode member 10 that conducts electricity between the headrest guide 6, the backrest upper frame 3 and the base-side electrode 2 via the middle electrode member 5, In the vicinity of the upper electrode member 10, there is provided an upper electrode member displacement meter 15 for detecting a displacement amount of the upper electrode member 10 from before welding to after welding of the headrest guide 6, and near the middle electrode member 5 after welding. A displacement gauge 16 for detecting a displacement amount of the middle electrode member 5 or the headrest guide 6 with respect to a moment load applied to the headrest guide 6 in a direction away from the backrest upper frame 3. A welding device for a vehicle frame provided with a.