阅读说明：本技术 一种Cr12MoV镶块现场焊接工艺 (Cr12MoV insert on-site welding process ) 是由 彭拥军 张健 涂红平 刘其诚 易昌平 于 2021-09-22 设计创作，主要内容包括：本发明公开了一种Cr12MoV镶块现场焊接工艺,涉及模具镶块焊接技术领域,主要用于解决若冲压现场没有加热箱式炉,Cr12MoV镶块进行焊接工作就很麻烦的问题。包括以下步骤：一、镶块预处理；二、画指示线；三、加热升温；四、保温、焊接；五、冷却镶块。本发明提供的一种Cr12MoV镶块现场焊接工艺,利用该工艺,无需加热箱式炉即可在冲压现场完成Cr12MoV镶块的焊接,大幅提高了工作效率。(The invention discloses a Cr12MoV insert on-site welding process, relates to the technical field of die insert welding, and is mainly used for solving the problem that the Cr12MoV insert is troublesome to weld if a heating box type furnace is not arranged on a stamping site. The method comprises the following steps: firstly, preprocessing a mosaic block; secondly, drawing an indication line; thirdly, heating and raising the temperature; fourthly, heat preservation and welding are carried out; and fifthly, cooling the insert. According to the Cr12MoV insert on-site welding process, the welding of the Cr12MoV insert can be completed on a stamping site without a heating box furnace, and the working efficiency is greatly improved.)

1. The on-site welding process of the Cr12MoV insert is characterized by comprising the following steps of:

firstly, pretreatment of a block: cleaning the surface of an insert (1) to be welded and determining a welding area;

II, drawing an indication line: drawing a plurality of indicating lines (2) on the surface of the insert (1) to be welded by using a 2B pencil;

thirdly, heating and warming: the insert (1) to be welded is heated by two welding torches (3) together until an indication line (2) sketched on the insert (1) to be welded disappears after desalination;

fourthly, heat preservation and welding: keeping a welding torch (3) to continuously heat the opposite side of the welding area of the insert (1) to be welded, and welding the insert (1) to be welded while keeping the temperature of the insert (1) to be welded not to be reduced until the welding is finished;

fifthly, cooling the insert: and naturally cooling the welded insert to normal temperature.

2. The Cr12MoV insert on-site welding process according to claim 1, wherein the step one specifically comprises the following steps:

s1, cleaning the surface of the insert (1) to be welded;

s2, determining a welding area;

and S3, forming a groove on the welding area.

3. The Cr12MoV insert on-site welding process according to claim 1, wherein the second step specifically comprises the following steps:

s1, drawing an indicating line (2) perpendicular to the edge line (4) on two side faces of the edge line (4) along the edge line (4) of the insert (1) to be welded by using a 2B pencil, wherein the distance between the tail end of the indicating line (2) and a welding area is 50 mm;

s2, supplementing and drawing an indicating line (2) at a blank of the surface of the insert (1) to be welded;

s3, repairing an indication line (2) at the welding area of the insert (1) to be welded, and enabling the indication line (2) at the position to be crossed.

4. The Cr12MoV insert field welding process according to the claim 1 or 3, characterized in that in the second step, the distance between the adjacent indication lines (2) is 25mm-30 mm.

5. The Cr12MoV insert in-situ welding process according to claim 1 or 3, wherein in the second step, the width of the indicating line (2) is 2mm-3 mm.

6. A Cr12MoV insert in-situ welding process according to claim 1, characterized in that in step three, the temperature of the insert (1) to be welded needs to be raised above 400 ℃.

7. The Cr12MoV insert on-site welding process according to claim 1, wherein in the fourth step, the insert (1) to be welded is subjected to welding treatment by shielded metal arc welding.

8. The on-site welding process of the Cr12MoV insert according to claim 1, wherein in the fourth step, the insert (1) to be welded is welded by manual argon tungsten-arc welding.

9. The in-situ welding process for the Cr12MoV insert according to claim 1, wherein a lead core of the 2B pencil is made of graphite powder and clay.

10. The Cr12MoV insert on-site welding process according to claim 1, wherein the welding torch (3) is an acetylene welding torch.

Technical Field

The invention relates to the technical field of die insert welding, in particular to a Cr12MoV insert on-site welding process.

Background

The Cr12MoV material belongs to high-carbon high-chromium ledeburite steel, and has the advantages of high hardenability, high wear resistance, small heat treatment deformation and the like. At present, Cr12MoV material is mainly used in the field of automobile dies, namely used for manufacturing trimming inserts, flanging inserts and other parts with various shapes. After the Cr12MoV material is processed into an insert finished product, the hardness, the strength and the toughness of the insert can be improved only by quenching and tempering heat treatment.

In the actual production and use process of the automobile die, due to abrasion of the die after long-time use, local modification of the product outline and the molded surface and the like caused by updating of a model of a manufacturer, the re-modification of the outline and the molded surface of a Cr12MoV insert finished product is needed. When the profile and the profile of the finished Cr12MoV material insert need to be modified again, the finished Cr12MoV material insert needs to be welded (repair welding).

In the existing welding (repair welding) treatment of the Cr12MoV material insert finished product, in order to ensure the hardness, strength and toughness of the insert after the welding (repair welding) treatment, the Cr12MoV material insert finished product needs to be put into a heating box type furnace for heating before welding, and the temperature is kept for several hours. And then welding the finished product of the Cr12MoV material insert, otherwise, cracking occurs in a welding area. However, since many stamping sites do not have a heating box furnace, the heat treatment and welding work of the Cr12MoV insert is troublesome, which further results in high labor and time consumption, and brings other inconveniences that the on-site welding process of the Cr12MoV insert is performed near the stamping line. If welding is carried out after heat preservation by using special heat preservation equipment (such as a heating box type furnace), the insert needs to be transported to a stamping line by a vehicle, and meanwhile, the heat preservation equipment is occupied until all the inserts are welded.

Disclosure of Invention

The invention aims to provide a Cr12MoV insert on-site welding process, by utilizing the process, the welding of the Cr12MoV insert can be completed on a stamping site without heating a box-type furnace, and the working efficiency is greatly improved.

The technical scheme for solving the technical problems is as follows: the on-site welding process of the Cr12MoV insert is characterized by comprising the following steps of:

firstly, pretreatment of a block: cleaning the surface of an insert to be welded and determining a welding area;

II, drawing an indication line: drawing a plurality of indicating lines on the surface of the insert to be welded by using a 2B pencil;

thirdly, heating and warming: heating the insert to be welded by adopting two welding torches together until the indication line sketched on the insert to be welded disappears;

fourthly, heat preservation and welding: keeping a welding torch to continuously heat the opposite side of a welding area of the insert to be welded, and welding the insert to be welded while keeping the temperature of the insert to be welded not to be reduced until the welding is finished;

fifthly, cooling the insert: and naturally cooling the welded insert to normal temperature.

As a further improvement of the present invention, the step one specifically comprises the following steps:

s1, cleaning the surface of the insert to be welded;

s2, determining a welding area;

and S3, forming a groove on the welding area.

As a further improvement of the present invention, the second step specifically comprises the following steps:

s1, drawing an indicating line vertical to the cutting edge line on two side faces of the cutting edge line along the cutting edge line of the insert to be welded by using a 2B pencil, wherein the distance between the tail end of the indicating line and a welding area is 50 mm;

s2, supplementing and drawing an indicating line at the blank of the surface of the insert to be welded;

and S3, supplementing an indicating line at the welding area of the insert to be welded, and enabling the indicating line at the position to be crossed.

As a further improvement of the invention, in the second step, the distance between the adjacent indicator lines is 25mm-30 mm.

As a further improvement of the invention, in the second step, the width of the indicator line is 2mm-3 mm.

As a further improvement of the present invention, in the third step, the temperature of the insert to be welded needs to be raised to 400 ℃ or higher.

As a further improvement of the invention, in the fourth step, the insert to be welded is subjected to welding treatment by shielded metal arc welding.

As a further improvement of the invention, in the fourth step, manual argon tungsten-arc welding is adopted to perform welding treatment on the insert to be welded.

As a further improvement of the invention, the manufacturing material of the pencil lead of the 2B pencil comprises graphite powder and clay.

As a further improvement of the invention, the welding torch is an acetylene welding torch.

Technical effects

Compared with the prior art, the Cr12MoV insert on-site welding process has the advantages that:

1. in the method, firstly, the surface of an insert to be welded needs to be cleaned, and a worker can confirm a welding area. Then, the worker uses a 2B pencil to draw an indicating line on the surface of the insert to be welded. And then, the worker burns the insert to be welded by using the two welding torches together, and the indication line drawn by the 2B pencil is gradually diluted under high-temperature burning until the indication line disappears, so that the insert to be welded is heated. By this time, the operator would leave a torch to continue heating the insert to be welded from the opposite side of the weld zone while simultaneously welding the weld zone. And finally, the welded insert only needs to be naturally cooled.

According to the method, the Cr12MoV insert is heated and insulated in a mode of replacing a heating box type furnace by an indication line drawn by a welding torch and a 2B pencil, so that the die is repaired/modified, and the welding of the Cr12MoV insert can be completed on a punching site on the premise of not heating the box type furnace. The heat treatment and welding time of the Cr12MoV insert can be greatly saved, and the die repairing efficiency is improved. Meanwhile, the welding process utilizes the welding torch to heat and preserve the heat of the Cr12MoV insert, and the service life of the insert is not influenced.

2. The surface of the insert to be welded is cleaned, so that the impurities left on the surface of the insert to be welded can be prevented from generating adverse effects on the subsequent welding process. Meanwhile, the welding area can be conveniently determined by workers, and the welding quality is ensured. The groove is formed in the welding area, so that the subsequent welding can be facilitated.

3. And (4) additionally drawing an indicating line at a blank of the surface of the insert to be welded so as to meet the requirement that the overall temperature of the insert to be welded does not have too large difference when the indicating line is irradiated by using the flame of a welding torch.

4. The indicating lines of the welding area are crossed, so that the temperature of the welding area can meet the welding requirement of the Cr12MoV insert block when the indicating lines of the welding area disappear.

The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.

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 block diagram of the process flow of the present invention.

FIG. 2 is a state diagram of an insert to be welded with an indication line drawn;

FIG. 3 is a view showing the operation of the torch for heating the insert to be welded;

fig. 4 is a diagram showing the operation of the welding of the insert to be welded.

Wherein: 1-an insert to be welded; 2-an indicator line; 3-welding torch; 4-edge line; 5-electrode holders.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

Examples

As shown in FIGS. 1 to 4, the invention discloses a Cr12MoV insert on-site welding process, which comprises the following steps:

firstly, pretreatment of a block: cleaning the surface of an insert 1 to be welded and determining a welding area;

II, drawing an indication line: drawing a plurality of indicating lines 2 on the surface of the insert 1 to be welded by using a 2B pencil;

thirdly, heating and warming: heating the insert 1 to be welded by two welding torches 3 together until the indication line 2 sketched on the insert 1 to be welded disappears in a desalting way;

fourthly, heat preservation and welding: keeping a welding torch 3 to continuously heat the opposite side of the welding area of the insert 1 to be welded, and welding the insert 1 to be welded while keeping the temperature of the insert 1 to be welded not to be reduced until the welding is finished;

fifthly, cooling the insert: and naturally cooling the welded insert to normal temperature.

In the method, firstly, the surface of the insert 1 to be welded needs to be cleaned, and a worker can confirm a welding area. Then, the worker uses a 2B pencil to draw an indication line 2 on the surface of the insert to be welded. And then, the worker burns the insert 1 to be welded together by using the two welding torches 3, and the indication line 2 drawn by the 2B pencil is gradually diluted under high-temperature burning until the indication line disappears, so that the insert 1 to be welded is heated. By this time, the worker will keep a welding torch 3 to continue heating the insert 1 to be welded from the opposite side of the weld zone while performing the welding process on the weld zone. And finally, the welded insert only needs to be naturally cooled.

According to the method, the Cr12MoV insert is heated and insulated in a mode of replacing a heating box type furnace by an indication line 2 drawn by a 3+2B pencil of a welding torch, so that the die is repaired/modified, and the welding of the Cr12MoV insert can be completed on a punching site on the premise of not heating the box type furnace. The heat treatment and welding time of the Cr12MoV insert can be greatly saved, and the die repairing efficiency is improved. Meanwhile, the welding process utilizes the welding torch 3 to heat and preserve the Cr12MoV insert, and the service life of the insert is not influenced.

The first step specifically comprises the following steps:

s1, cleaning the surface of the insert 1 to be welded;

s2, determining a welding area;

and S3, forming a groove on the welding area.

The surface of the insert 1 to be welded is cleaned, so that the impurities left on the surface of the insert 1 to be welded can be prevented from generating adverse effects on the subsequent welding process. Meanwhile, the welding area can be conveniently determined by workers, and the welding quality is ensured. The groove is formed in the welding area, so that the subsequent welding can be facilitated.

Meanwhile, the second step specifically comprises the following steps:

s1, drawing an indicating line 2 vertical to the cutting edge line 4 on two side faces of the cutting edge line 4 along the cutting edge line 4 of the insert 1 to be welded by using a 2B pencil, wherein the distance between the tail end of the indicating line 2 and a welding area is 50 mm;

s2, supplementing an indication line 2 at a blank of the surface of the insert 1 to be welded so as to meet the requirement that the overall temperature of the insert 1 to be welded does not differ too much when the indication line 2 is irradiated by flame of a welding torch 3;

s3, additionally drawing an indication line 2 in the welding area of the insert 1 to be welded, and enabling the indication line 2 to be in a cross shape, so that when the indication line of the welding area disappears, the temperature of the welding area reaches the welding requirement of the Cr12MoV insert.

In the second step, the distance between the adjacent indication lines 2 is 25mm-30 mm. The width of the indicator line 2 is 2mm to 3 mm.

In step three, the temperature of the insert 1 to be welded needs to be raised to more than 400 ℃.

In the fourth step, the welding clamp 5 adopts shielded metal arc welding or manual argon tungsten-arc welding to weld the insert 1 to be welded.

In this embodiment, the manufacturing material of the refill of the 2B pencil includes graphite powder and clay. The welding torch 3 is an acetylene welding torch. Specifically, torch 3 is model H01-12A.

In the present embodiment, the principle of indicating the temperature of the insert 1 to be welded to reach the proper welding temperature by the fading of the indication line 2 is as follows:

in the method, the chemical components of the adopted 2B pencil belong to graphite materials, and black marks, namely the indication lines 2, can be left by drawing lines on the Cr12MoV insert. The pencil lead is made of graphite powder and clay in a certain proportion. Graphite is a dark gray, soft and greasy mineral, and its own melting point is 3652 ℃. And the temperature under the flame of the acetylene welding torch is 3000 ℃. Thus, under the flame irradiation of the acetylene torch, the graphite did not reach its melting point, and the trace was not dissolved.

However, the insert 1 to be welded made of Cr12MoV material gradually increases in temperature. In the temperature rising process of the insert 1 to be welded, when the heating temperature of the Cr12MoV material reaches 400 ℃, the Cr12MoV material starts to react with graphite and is gradually converted into metal carbide, wherein the color of the metal carbide is consistent with that of the Cr12MoV material. Meanwhile, the reaction process is gradually accelerated along with the increase of the temperature of the Cr12MoV material. Therefore, when the indicator line 2 disappears, it indicates that the temperature of the Cr12MoV material has reached above 400 ℃, and 400 ℃ is just a critical value for whether the insert made of the Cr12MoV material can be welded.

The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.