阅读说明：本技术 一种电极头的修磨方法 (Grinding method of electrode tip ) 是由 王亚东 崔宏涛 孟庆刚 金世铨 董学涛 苏崇涛 张秀香 栾天阳 胡小强 卢秉仲 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种电极头的修磨方法,在点焊机上配合修磨器对电极头进行修磨,包括：S1、设置点焊机的电流为0A；S2、将修磨器水平放置在下极头上；S3、在焊接程序中设定第一次修磨压力和第一次修磨时间,修磨压力和修磨时间根据电极头的磨损情况进行设定；S4、通过控制修磨器的控制器同时完成上下电极头的第一次修磨；S5、根据电极头上一次的修磨效果重复调整修磨时间和修磨压力,直至电极头的端面尺寸、形状、表面质量达到标准要求。修磨压力及修磨时间可在较大范围内调整,适用不同磨损状态的电极头,本方法可以满足任何材料以及焊接方案进行调整时,对电极头端面尺寸、形状及表面质量的要求。(The invention discloses a method for grinding an electrode tip, which is used for grinding the electrode tip by matching a grinder on a spot welding machine and comprises the following steps: s1, setting the current of the spot welding machine to be 0A; s2, horizontally placing the sharpening device on the lower pole head; s3, setting first thinning pressure and first thinning time in the welding program, wherein the thinning pressure and the thinning time are set according to the abrasion condition of the electrode tip; s4, finishing the first grinding of the upper electrode tip and the lower electrode tip simultaneously by controlling a controller of the grinding device; and S5, repeatedly adjusting the coping time and the coping pressure according to the last coping effect of the electrode tip until the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements. The grinding pressure and the grinding time can be adjusted in a large range, and the method is suitable for electrode tips in different wear states.)

1. The electrode tip grinding method is characterized in that a grinder is matched on a spot welding machine to grind the electrode tip, and the method comprises the following steps:

s1, setting the welding current of the spot welding machine to be 0A;

s2, horizontally placing the sharpening device on the lower electrode head of the electrode head;

s3, setting a first thinning pressure and a first thinning time in a welding program, wherein the first thinning pressure and the first thinning time are set according to the abrasion condition of the electrode tip;

s4, finishing the first grinding of the electrode tip by controlling a controller of the grinder;

and S5, repeatedly adjusting the coping time and the coping pressure according to the last coping effect of the electrode tip until the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements.

2. A method of coping an electrode tip according to claim 1, wherein said spot welder is a vertical medium frequency resistance spot welder.

3. A method of sharpening an electrode tip as claimed in claim 1, wherein the sharpener is a pneumatic electrode sharpener.

4. A process for coping an electrode tip according to claim 1, wherein said specific operation in step S1 is: the welding current of the spot welder is turned off.

5. A process for coping an electrode tip according to claim 1, wherein said specific operation in step S1 is: the current of preheating pulse, welding pulse and tempering pulse in the welding procedure is set to be 0A.

6. A tip grinding method according to claim 1, wherein said step S3 includes: the setting range of the first thinning time is between 100ms and 5000 ms.

7. A tip grinding method according to claim 1, wherein said step S3 includes: the set range of the first thinning pressure is between 1.0kN and 10.0 kN.

8. An electrode tip grinding method according to claim 1, wherein the grinding method is suitable for one of cold-rolled high-strength steel, hot-galvanized high-strength steel and hot-formed steel.

9. A method of coping an electrode head according to claim 1, wherein the method of coping is:

in the process of welding the cold-rolled high-strength steel with the same steel grade and the thickness of 1.2mm, the first grinding pressure is set to be 3.3kN, and the first grinding time is set to be 1500 ms.

10. A method of coping an electrode head according to claim 1, wherein the method of coping is:

in the process of welding hot-dip galvanized high-strength steel with the same steel grade and the thickness of 1.4mm, the first grinding pressure is set to be 2.8kN, and the first grinding time is set to be 2000 ms.

Technical Field

The invention belongs to the technical field of electrode tip grinding, and particularly relates to a grinding method of an electrode tip.

Background

Resistance spot welding is a widely used joining technique, in which a large amount of current flows through a workpiece between electrodes under a certain pressure, a molten pool is formed in the workpiece due to contact resistance and joule heat, and the molten pool is cooled to solidify the workpiece, and the workpieces are joined together. In the welding process, the electrode tip is subjected to formation and cooling of a molten pool under the action of continuously bearing welding pressure, the molten pool is easy to splash under the condition of a strong welding process, the size, the shape and the surface quality of the end face of the electrode tip are affected, the size and the shape of the end face of the electrode tip can not meet the standard requirements when the end face of the electrode tip is abraded in an accelerated manner, and the final welding quality is affected, so that a reasonable electrode tip coping system is formulated according to welding materials and a welding process.

In the process of welding window testing and welding process development, welding scheme modification and verification are frequently carried out, when welding of ultrahigh-strength steel or galvanized products is involved, actual wear states of the electrode tips are inconsistent, and in order to meet welding quality requirements and reduce consumption of the electrode tips so as to reduce cost, window testing and process development by adopting new electrode tips are not recommended.

The medium-frequency direct-current electric welding machines mainly applied at present are all provided with automatic coping programs, coping pressure and coping time cannot be controlled manually, targeted coping cannot be carried out according to the actual abrasion condition of the electrode tip, the pole tip coping program with inherent parameters is generally defaulted to coping under the condition that the end surface of the electrode tip is seriously abraded and cannot meet the requirements of a welding process, the cutting amount is very large in the coping process, the service life of the electrode tip is inevitably reduced obviously, and therefore the coping problem aiming at the actual abrasion condition of the electrode tip is particularly raised by combining different welding materials and processes.

Disclosure of Invention

The invention provides a method for grinding an electrode tip to solve the problems, which ensures good and stable welding quality, and when the electrode tip is adjusted and welded according to different materials and welding schemes, the electrode tip is ground again to reach the size, shape and surface quality of the end face of the electrode tip required by the standard, and the method specifically comprises the following steps:

a method for grinding an electrode tip, which is used for grinding the electrode tip by matching a grinder on a spot welding machine, comprises the following steps:

s1, setting the welding current of the spot welding machine to be 0A;

s2, horizontally placing the sharpening device on the lower pole head;

s3, setting a first thinning pressure and a first thinning time in a welding program, wherein the thinning pressure and the thinning time are set according to the abrasion condition of the electrode tip;

s4, finishing the first grinding of the electrode tip by controlling a controller of the grinder;

and S5, repeatedly adjusting the coping time and the coping pressure according to the last coping effect of the electrode tip until the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements.

Preferably, the spot welding machine is a vertical medium-frequency resistance spot welding machine.

Preferably, the sharpening device is a pneumatic electrode sharpening device.

Preferably, the specific operations in step S1 are: the welding current of the spot welder is turned off.

Preferably, the specific operations in step S1 are: the current of preheating pulse, welding pulse and tempering pulse in the welding procedure is set to be 0A.

Preferably, step S3 includes: the setting range of the first thinning time is between 100ms and 5000 ms.

Preferably, step S3 includes: the set range of the first thinning pressure is between 1.0kN and 10.0 kN.

Preferably, the coping method is suitable for steel types with serious abrasion to the electrode tip, such as cold-rolled high-strength steel, hot-galvanized high-strength steel, hot-formed steel and the like.

Preferably, in the grinding method, in the process of welding the cold-rolled high-strength steel with the same steel type and the thickness of 1.2mm, the first grinding pressure is set to be 3.3kN, and the first grinding time is set to be 1500 ms.

Preferably, in the grinding method, in the process of welding the hot-dip galvanized high-strength steel with the same steel grade and the thickness of 1.4mm, the first grinding pressure is set to be 2.8kN, and the first grinding time is set to be 2000 ms.

Has the advantages that: according to the electrode tip grinding method, the grinding pressure and the grinding time can be adjusted in a large range, the method is suitable for electrode tips in different wear states, the practicability is high, the electrode tips of different types can be ground, the grinding effect can be tested through pre-grinding, progressive or decreasing adjustment of the grinding pressure and the grinding time is performed on the basis, the cutting amount of the electrode tip is controlled at the lowest level, and the service life of the electrode tip is prolonged; the flexible electrode tip coping method is suitable for the requirements of the electrode tip end surface size, shape and surface quality when any material and welding scheme are adjusted.

Drawings

FIG. 1 is a flow chart of an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terms first, second, third, etc. are used herein to describe various components or features, but these components or features are not limited by these terms. These terms are only used to distinguish one element or part from another element or part. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. For convenience of description, spatially relative terms such as "inner", "outer", "upper", "lower", "left", "right", "upper", "left", "right", and the like are used herein to describe the orientation relation of the components or parts in the present embodiment, but these spatially relative terms do not limit the orientation of the technical features in practical use.

In the process of welding window testing and welding process development, frequent welding scheme modification and verification are required, when products such as cold-rolled high-strength steel, hot-galvanized high-strength steel, hot-formed steel and the like are welded, actual abrasion states of electrode tips are inconsistent, and in order to ensure good and stable welding quality, when welding process adjustment is carried out on different materials and welding schemes, the electrode tips need to be reground to achieve the end face size, shape and surface quality of the electrode tips meeting the standard requirements. By the method, a welding operator can randomly adjust the coping pressure and the coping time to carry out targeted coping on the electrode tip, so that the reduction of the service life of the electrode tip caused by excessive cutting amount due to a coping procedure with fixed parameters is avoided. The method specifically comprises the following steps:

as shown in fig. 1, a method for grinding an electrode tip, which is to grind the electrode tip by matching a grinder on a spot welding machine, comprises the following steps:

and S1, setting the welding current of the spot welding machine to be 0A.

Because the electrode tip needs to be prevented from passing through current in the grinding process, the welding current of the spot welding machine needs to be set to be 0A, and the grinding blade can be prevented from being damaged or softened due to the fact that the grinding blade is subjected to larger welding current, and the final quality of the whole grinding is affected.

The spot welding machine in the method is a vertical intermediate frequency resistance spot welding machine, and the coping device is a pneumatic electrode coping device. The two are used in a matching way, so that the polishing can be directly carried out after spot welding.

In addition, in the operation of setting the welding current of the spot welding machine to be 0A, the method has two embodiments:

in a preferred embodiment, the specific operations in step S1 are: the welding current of the spot welder is turned off.

In a preferred embodiment, the specific operations in step S1 are: the current of preheating pulse, welding pulse and tempering pulse in the welding procedure is set to be 0A.

After the operation of step S1 is completed, the next step is performed:

s2, horizontally placing the sharpening device on the lower pole head.

In order to ensure that the electrode tip can be better ground, all parts are uniformly ground, and the size, the shape and the surface quality of the end face of the electrode tip which meet the standard requirements are achieved, the grinding device needs to be horizontally placed on the lower machine head. The coping device of the method is the prior art, and the specific structure is not described in detail.

After step S2 is completed, the next operation is performed:

and S3, setting a first thinning pressure and thinning time in the welding program, wherein the thinning pressure and the thinning time are set according to the abrasion condition of the electrode tip.

For the electrode tip, grinding the surface of the electrode tip to meet the standard requirement needs to be repeated for a plurality of times, but the first rough machining has great influence on the final grinding effect, so when the grinding time and the grinding pressure are set, an evaluation needs to be carried out according to the material of a welded material, the number of welded welding points, the actual welding process, the change condition of the diameter of the welding points and the like, and the first grinding time and the grinding pressure are determined after the evaluation.

Wherein, the first thinning time and the first thinning pressure in the step S3 are generally set as follows: the setting range of the first thinning time is between 100ms and 5000 ms. The set range of the first thinning pressure is between 1.0kN and 10.0 kN.

And S4, finishing the first grinding of the electrode tip by controlling a controller of the grinder.

And S5, repeatedly adjusting the coping time and the coping pressure according to the last coping effect of the electrode tip until the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements.

The standard requirements can be verified by polar imprinting, and the method is not described in detail.

In a preferred embodiment, the coping method is suitable for steel types with severely abraded electrode tips, such as cold-rolled high-strength steel, hot-galvanized high-strength steel, hot-formed steel and the like.

Since the first dressing time and the first dressing pressure in the method need to be determined according to the parameters of the relevant electrode tip, the invention cites the following examples:

a preferred embodiment: according to the coping method, in the process of welding the cold-rolled dual-phase high-strength steel DP980 with the same steel type and the thickness of 1.2mm, the welding current of the vertical intermediate-frequency resistance spot welding machine is set to be closed, or the preheating pulse, the welding pulse and the tempering pulse current in the welding program capable of adjusting the welding parameters are set to be 0A, the electrode tips welded with 150 welding points are coping, the first coping pressure is set to be 3.3kN, the first coping time is set to be 1500ms, the abrasion layer of the end face is removed in the first coping process, the further coping pressure is set to be 2.2kN, the further coping time is set to be 550ms, and the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements through testing.

A preferred embodiment: according to the grinding method, in the process of welding the hot-galvanized dual-phase high-strength steel DP780 which is the same steel type and has the thickness of 1.4mm, the welding current of the vertical intermediate-frequency resistance spot welding machine is set to be closed, or the preheating pulse, the welding pulse and the tempering pulse current in the selected welding program capable of adjusting the welding parameters are set to be 0A, grinding is carried out on an electrode tip which is welded with 80 welding points, the first grinding pressure is set to be 2.8kN, the first grinding time is set to be 2000ms, most of a wear layer on the grinding end face is removed for the first time, the further grinding pressure is set to be 2.8kN, the further grinding time is set to be 800ms, the final grinding is carried out with the grinding pressure of 1.9kN and the grinding time of 800ms, and the size, the shape and the surface quality of the end face of the electrode tip meet the standard requirements through testing. Therefore, the number of coping is also set according to the material to be welded, the specific welding process and the effect combined with the effect after the last coping.

In a preferable embodiment, the coping method is used in the process of welding hot forming steel PHS2000 which is the same as the steel and has the thickness of 1.4 mm.

The welding current of the vertical medium-frequency resistance spot welding machine is set to be closed, or the preheating pulse, the welding pulse and the tempering pulse current in the selected welding program capable of adjusting the welding parameters are all set to be 0A, the electrode tips welded with 120 welding spots are polished, the first polishing pressure is set to be 4kN, the first polishing time is set to be 1300ms, the first polishing end surface abrasion layer is removed, the further polishing pressure is set to be 2.2kN, the further polishing time is set to be 700ms, and the size, the shape and the surface quality of the end surface of the electrode tip meet the standard requirements after being tested.

The method can be used for grinding the electrode tips worn by different materials to be welded, welding processes and the like, and the desired grinding effect can be obtained only by controlling grinding time and grinding pressure. Because the coping pressure and the coping time can be adjusted in a larger range, the method is widely suitable for coping the damaged electrode tip when different materials to be welded, welding processes and the like are adjusted. The method can carry out pre-grinding test grinding effect, carry out progressive or decreasing adjustment of grinding pressure and grinding time on the basis, control the cutting amount of the electrode tip at the lowest level and prolong the service life of the electrode tip; the flexible electrode tip coping method is suitable for the requirements of the electrode tip end surface size, shape and surface quality when any material and welding scheme are adjusted.

The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.