CN215468786U

CN215468786U - Device capable of reducing deformation of thin plate in welding process

Info

Publication number: CN215468786U
Application number: CN202121868539.0U
Authority: CN
Inventors: 孙占国
Original assignee: Jiachuang Mechanical Equipment Manufacturing Gu'an Co ltd
Current assignee: Jiachuang Mechanical Equipment Manufacturing Gu'an Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2022-01-11
Anticipated expiration: 2031-08-11

Abstract

The utility model provides a device capable of reducing deformation in a sheet welding process, and relates to the technical field of friction stir welding deformation control. The utility model firstly measures the temperature of different points on two sides of the welding line in the existing welding process, and presets a temperature field at the bottom of the welding line in a heating mode, thereby reducing the temperature gradient in the welding process and effectively solving the defect of large deformation of the thin plate after welding.

Description

Device capable of reducing deformation of thin plate in welding process

Technical Field

The utility model relates to the technical field of friction stir welding deformation control, in particular to a device capable of reducing deformation of a thin plate in a welding process.

Background

Friction stir welding is a novel solid phase welding method, which utilizes a special stirring head to extend into the joint of a workpiece, the stirring head rotates at a high speed while advancing, a large amount of heat is generated through the high-speed rotation of the stirring head, but the material does not reach a melting state, and has lower heat input, so that the metal at the welding part is in a thermoplastic state, and forms a whole under the pressure action of the stirring head. Compared with the traditional fusion welding, the welding method has the advantages of environmental protection, no pollution, low residual stress and small workpiece deformation, and has wide application in the connection of lead alloy, magnesium alloy, aluminum alloy, copper alloy, steel, titanium alloy and the like.

However, for the welding of some thin-wall plates, the welding deformation is still outstanding, the use requirements cannot be met, the workpieces are often required to be further shaped, annealed, shot-blasted and the like, the time and the labor are wasted, and the shape-righting effect is limited.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a device capable of reducing deformation during a thin plate welding process, so as to solve the technical problems in the prior art that some thin-walled plates have prominent welding deformation, cannot meet use requirements, often require further shaping, annealing, shot blasting, and other treatments on a workpiece, are time-consuming and labor-consuming, and have limited shape-righting effect.

In order to achieve the purpose, the utility model provides a device capable of reducing deformation in a sheet welding process, which comprises a supporting base plate, wherein the supporting base plate is used for supporting a workpiece to be welded, the workpiece is arranged on the surface of the supporting base plate, a heating assembly used for heating different areas of the workpiece and a temperature measuring assembly used for measuring the temperature of the different areas of the workpiece are arranged in the supporting base plate, and the sum of the temperature value on the side of the temperature measuring assembly and the heating temperature of the heating assembly is a constant value.

According to a preferred embodiment, the heating assembly comprises a plurality of heating elements, which are arranged side by side inside the supporting mat.

According to a preferred embodiment, the heating elements are arranged at equal intervals and extend in the direction of extension of the weld centre of the workpiece, the heating elements extending from one end of the support mat to the opposite end.

According to a preferred embodiment, the heating elements are arranged in seven rows, distributed from the center of the support mat to the two sides.

According to a preferred embodiment, the thermometric assembly is perpendicular to the direction of extension of the heating element.

According to a preferred embodiment, the temperature measuring assembly comprises a plurality of temperature measuring thermocouples, and the temperature measuring thermocouples are distributed from the center to two sides of the supporting base plate.

According to a preferred embodiment, the temperature thermocouples include a weld center thermocouple, a forward-side thermocouple, and a backward-side thermocouple, the weld center thermocouple facing the weld center of the workpiece.

According to a preferred embodiment, the advance side thermocouples are provided in three numbers, and the advance side thermocouples are arranged at equal intervals in order from the weld center thermocouple toward the advance side.

According to a preferred embodiment, the setback-side thermocouples are provided in three numbers, and the setback-side thermocouples are arranged at equal intervals in order from the center thermocouple of the weld toward the setback side.

According to a preferred embodiment, the support of the support mat is rigidly supported.

The device for reducing the deformation of the thin plate in the welding process has the following technical effects:

the device capable of reducing deformation of the thin plate in the welding process mainly comprises a supporting base plate, wherein the supporting base plate is used for supporting a workpiece to be welded, a heating assembly and a temperature measuring assembly are arranged inside the supporting base plate, the heating assembly can heat the workpiece in different areas, the temperature measuring assembly can measure the temperature of the workpiece in different areas, the sum of the temperature value of the temperature measuring assembly and the heating temperature of the heating assembly is a fixed value, namely, the temperature measuring device firstly measures the temperature of different points on two sides of a welding seam in the existing welding process, and a temperature field is preset at the bottom of the welding seam in a heating mode, so that the temperature gradient in the welding process is reduced, and the defect of large deformation of the thin plate after welding is effectively overcome.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of an apparatus for reducing deformation during welding of thin plates according to an embodiment of the present invention;

FIG. 2 is a perspective view of the apparatus of FIG. 1 for reducing distortion during welding of sheets;

FIG. 3 is a front view of the apparatus of FIG. 1 for reducing sheet welding distortion;

FIG. 4 is a cross-sectional view taken along B-B of the apparatus of FIG. 3 for reducing distortion during welding of sheets;

FIG. 5 is a control unit of the temperature measuring system of the apparatus for reducing deformation in the welding process of the sheet of FIG. 1;

FIG. 6 is a control unit of a heating system of the apparatus of FIG. 1 for reducing distortion during welding of sheets;

FIG. 7 is a value of temperature measurement during welding of example 1;

FIG. 8 is a value of temperature measurement when the heating element is turned on in the welding process of example 1;

FIG. 9 is a value of temperature measurement during welding of example 2;

fig. 10 is a value of temperature measurement when the heating element is turned on in the welding process of example 2.

Wherein, fig. 1-10:

1. a workpiece; 11. welding seams; 2. a support pad; 21. a heating assembly; 211. a heating element; 22. a temperature measuring component; 221. a welding seam center thermocouple; 222. a forward-side thermocouple; 223. the retreat side thermocouple.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

As described in the background art, in the prior art, welding deformation still appears prominently for welding of some thin-wall plates, the use requirements cannot be met, further shaping, annealing, shot blasting and other treatments are often required to be carried out on workpieces, time and labor are wasted, and the shape-righting effect is limited.

Based on the above, the utility model provides a device capable of reducing deformation of a thin plate in a welding process, which mainly comprises a supporting base plate, wherein the supporting base plate is used for supporting a workpiece to be welded, a heating assembly and a temperature measuring assembly are arranged in the supporting base plate, the heating assembly can heat the workpiece in different areas, the temperature measuring assembly can measure the temperature of the workpiece in different areas, and the sum of the temperature value of the temperature measuring assembly and the heating temperature of the heating assembly is a fixed value.

The technical scheme of the utility model is explained in detail in the following with specific attached figures 1-6.

As shown in fig. 1-4, the present invention provides an apparatus for reducing deformation during welding of thin plates, preferably aluminum alloy thin plates, wherein the welding is friction stir welding.

As shown in fig. 1 and 2, the device includes a supporting backing plate 2, a heating assembly 21 and a temperature measuring assembly 22, the heating assembly 21 and the temperature measuring assembly 22 are located inside the supporting backing plate 2, the heating assembly 21 is used for heating different regions of the workpiece 1, the temperature measuring assembly 22 is used for measuring temperatures of different regions of the workpiece 1, and it should be noted that the sum of the temperature value on the side of the temperature measuring assembly 22 and the heating temperature of the heating assembly 21 is a fixed value.

According to the utility model, the bottom of the workpiece 1 is heated before welding by measuring the temperature in the friction stir welding process, the preset temperature field and the temperature field with the opposite rule in the welding process are preset, so that the temperature gradient of the workpiece 1 at two sides of the welding seam 11 is reduced due to the superposition of the welding heat generation and the preset temperature field in the welding process, the residual stress of the workpiece 1 is reduced, and the effect of reducing the welding deformation is achieved.

Meanwhile, the heating assembly 21 and the temperature measuring assembly 22 are arranged inside the supporting base plate 2, the operation is flexible, the adaptability is strong, different temperature fields can be preset according to the temperature difference of the workpiece 1 under different welding parameters, and the deformation control is more flexible.

In addition, the main function of the supporting base plate 2 is to support the workpiece 1 to be welded, and the supporting base plate 2 is located right below the part to be welded, so that the heating assembly 21 and the temperature measuring assembly 22 are fixed and heat conduction is achieved in addition to providing rigid support in the welding process.

Further, as shown in fig. 1 to 4, the heating assembly 21 includes a plurality of heating elements 211, preferably seven heating elements 211, which control the heating degree of each heating element 211 to be different, the seven heating elements 211 are disposed side by side inside the backing plate 2 and extend along the extending direction of the center of the weld 11 of the workpiece 1 from one end to the opposite end of the backing plate 2, and the seven heating elements 211 are distributed from the center of the backing plate 2 to both sides.

Further, as shown in FIGS. 1-4, the temperature measuring component 22 is perpendicular to the extending direction of the heating element 211, i.e. when the heating element 211 is disposed along the direction of the weld 11 of the workpiece 1, the temperature measuring component is perpendicular to the direction of the weld 11, and the two sides of the weld 11 are respectively the forward side and the backward side.

The temperature measuring assembly 22 includes a plurality of temperature thermocouples distributed from the center of the backing plate 2 to both sides, and specifically, the temperature thermocouples include a weld center thermocouple 221, three forward side thermocouples 222, and three backward side thermocouples 223, the weld center thermocouple 221 facing the center of the weld 11 of the workpiece 1, the forward side thermocouples 222 being arranged at equal intervals in order from the weld center thermocouple 221 to the forward side, and the backward side thermocouples 223 being arranged at equal intervals in order from the weld center thermocouple 221 to the backward side.

The temperature measuring module 22 of the present invention tests the temperatures of different regions of the bottom, forward side region and backward side region of the weld 11 during welding by the weld center thermocouple 221, forward side thermocouple 222 and backward side thermocouple 223 which are preset inside the backing plate 2, and records the maximum temperatures of the different regions during welding, as shown in fig. 5. The heating assembly 21 is heated by the heating element 211 pre-installed inside the support mat 2, and after the temperature is increased, the holding temperature of the heating element 211 may be set, as shown in fig. 6.

The device comprises the following specific steps:

step 1: and (3) normally welding the aluminum alloy sheets, starting the temperature measuring assembly 22, closing the heating assembly 21, and measuring the real-time temperature and the highest temperature of seven temperature measuring points at the bottom in the welding process.

Step 2: and starting the heating assembly 21, setting different heating temperatures for different positions, stopping for a period of time after the heating element 211 reaches the heating temperature, normally performing friction stir welding after the temperature of the workpiece 1 is stable, and normally starting the heating element 211 in the welding process.

And step 3: after welding is completed, the heating element 211 is gradually turned off in an effort to uniformly cool the workpiece 1, and the workpiece 1 is removed after complete cooling.

Example 1: 2 2024 aluminum alloy plates with the thickness of 2mm, the length of 300mm and the width of 100mm are used as workpieces 1 and welded by friction stir welding.

The diameter of the stirring head is 10mm, the shaft shoulder is shaped like a double-ring, the rotating speed is 600rpm, and the welding speed is 100 mm/min.

By adopting a conventional welding method, the whole welded workpiece 1 is saddle-shaped, and the maximum deformation is about 6 mm; with the device of the utility model, temperature measurement values and heating temperature parameters in the normal welding process are shown in fig. 7 and 8; after welding, the heating element 211 is closed, the workpiece 1 is taken down after natural cooling, the integral flatness of the workpiece 1 is obviously reduced, and the integral flatness can be smaller than 1.8 mm.

Example 2: 2 6061 aluminum alloy plates with the thickness of 4mm, the length of 300mm and the width of 100mm are used as workpieces 1 and welded by friction stir welding.

The diameter of the stirring head is 15mm, the shaft shoulder is shaped like a double-ring, the rotating speed is 600rpm, and the welding speed is 100 mm/min.

The maximum deformation of the workpiece 1 after welding is about 6mm by adopting a conventional welding method; with the device of the utility model, temperature measurement values and heating temperature parameters in the normal welding process are shown in fig. 9 and 10; after welding, preserving heat for 10min, then closing the heating element 211, naturally cooling the workpiece 1, and taking down the plate; and (3) test results: the integral flatness of the plate is less than 1 mm.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. The device capable of reducing deformation of the thin plate in the welding process is characterized by comprising a supporting base plate, wherein the supporting base plate is used for supporting a workpiece to be welded, the workpiece is arranged on the surface of the supporting base plate, a heating assembly used for heating different areas of the workpiece and a temperature measuring assembly used for measuring the temperature of the different areas of the workpiece are arranged in the supporting base plate, and the sum of the temperature value of the side of the temperature measuring assembly and the heating temperature of the heating assembly is a fixed value.

2. The apparatus of claim 1, wherein the heating assembly comprises a plurality of heating elements, and the heating elements are arranged side by side inside the backing plate.

3. The apparatus of claim 2, wherein the heating elements are arranged at equal intervals and extend along the extension direction of the weld center of the workpiece, and the heating elements extend from one end of the support pad to the opposite end.

4. The apparatus for reducing deformation during welding of a thin plate as set forth in claim 2, wherein said heating elements are provided in seven numbers, and said heating elements are distributed from the center of said support mat to both sides.

5. The apparatus of claim 4, wherein the temperature measuring assembly is perpendicular to the direction of the heating element.

6. The apparatus of claim 5, wherein the temperature measuring assembly comprises a plurality of temperature measuring thermocouples distributed from the center of the backing plate to both sides of the backing plate.

7. The apparatus of claim 6, wherein said thermometric thermocouples comprise a weld center thermocouple, a forward side thermocouple, and a reverse side thermocouple, said weld center thermocouple facing a weld center of said workpiece.

8. The apparatus of claim 7, wherein said advancement thermocouples are comprised of three, and wherein said advancement thermocouples are arranged in said sequence at equal intervals from said weld center thermocouple to the advancement side.

9. The apparatus of claim 7, wherein said setback thermocouples are arranged at equal distances from said thermocouple at the center of said weld toward the setback side.

10. The apparatus for reducing deformation during welding of thin plates according to any one of claims 1 to 9, wherein the supporting plate is supported rigidly.