Die part assembling and welding method

Abstract

The invention discloses a die part assembling and welding method, and belongs to the technical field of dies. The welding method comprises the steps that firstly, the welding portions of a first part and a second part are connected, the first part and the second part of a mold are fixed, and the first part and the second part of the mold are kept fixed in the subsequent step 2 and the subsequent step 3, and secondly, the first part and the second part of the mold are subjected to heating treatment, and thirdly, the welding portions of the first part and the second part of the mold are welded within the heating treatment preset time. The first part and the second part of the mold are heated before welding, and the first part and the second part are welded when the first part and the second part still have a certain temperature within the preset heating treatment time, so that the temperature difference between the first part and the second part before and after welding can be reduced, and the welding deformation is reduced; the problems that in the prior art, welding deformation and welding seam cracking are prone to occurring, and the size is difficult to control are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of molds, and in particular relates to a method for assembling and welding mold parts. Background Art

[0002] Due to special molding process requirements and the need to save mold materials, existing mold parts need to be divided into two or more parts, and then welded together. During the welding process, the welding parts of the mold parts are prone to welding deformation, weld cracking, and poor size control. Summary of the invention

[0003] Purpose of the invention: To provide a method for assembling and welding mold parts, which can reduce the welding deformation by heating the first part and the second part of the mold before welding, thereby solving the problems of welding deformation, weld cracking and poor size control in the prior art.

[0004] The technical solution of the present invention is: a method for assembling and welding mold parts includes: step one, connecting the welding parts of the first part and the second part, fixing the first part and the second part of the mold, and keeping the first part and the second part of the mold fixed in subsequent steps two and three.

[0005] Step 2: heat the first part and the second part of the mold.

[0006] Step 3: welding the first part and the second part of the mold at the welding position within the predetermined heating treatment time.

[0007] In a further embodiment, in step 2, the first part and the second part of the mold are heated to at least 290°C and kept warm for at least 30 minutes, so that in step 3, the temperature of at least the welding part of the first part and the second part is above 150°C.

[0008] In a further embodiment, in step two, the first part and the second part of the mold are placed in a heating furnace for heating.

[0009] In a further embodiment, in step three, a first layer of spot welding is first performed on the welding parts of the first part and the second part of the mold using a spot welding process.

[0010] Then, after the first layer of spot welding is completed, at least one layer of welding is performed on the welding parts of the first part and the second part of the mold to fully weld the welding parts.

[0011] In a further embodiment, when performing the first layer of spot welding, the first and second parts of the mold are spot welded using a diagonally symmetrical spot welding process. The diagonally symmetrical spot welding can further make the welding parts evenly stressed and heated, reducing the lateral welding deformation rate during welding.

[0012] In a further embodiment, when spot welding the first layer, the spot welding current is no more than 90A, and the welding spot of each spot welding is no more than 1mm. Spot welding is performed with a smaller welding current and a shorter welding length to reduce welding temperature and welding deformation.

[0013] In a further embodiment, when performing at least one layer of welding, a diagonally symmetrical welding process is used to perform at least one layer of welding on the welding parts of the first part and the second part of the mold. The diagonally symmetrical welding process can further make the welding parts evenly stressed and heated, thereby reducing the lateral welding deformation rate during welding.

[0014] In a further embodiment, when performing at least one layer of welding, the welding current of each layer is not greater than 100A, and the welding length of each layer is not greater than 10mm. By performing each layer of welding with a smaller welding current and a shorter welding length, the welding temperature and welding deformation are reduced.

[0015] In a further embodiment, in step three, at least two layers of welding are performed, and each layer of welding is cooled for 15 to 30 minutes before the next layer of welding is performed until the welding parts of the first part and the second part of the mold are fully welded.

[0016] The beneficial effect of the present invention is that by heating the first part and the second part of the mold before welding, welding is performed when the first part and the second part still have a certain temperature within a predetermined time of the heating treatment, which can reduce the temperature difference between the first part and the second part before and after welding, reduce the welding deformation, and solve the problems of welding deformation, weld cracking, and poor size control in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flowchart of the welding method of the present invention. DETAILED DESCRIPTION

[0018] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0019] The present application discloses a method for assembling and welding mold parts. By heating the first part and the second part of the mold before welding, the temperature difference before and after welding of the first part and the second part can be reduced, the welding deformation is reduced, and the problems of welding deformation, weld cracking and poor size control in the prior art are solved.

[0020] In the first embodiment, the mold parts assembly and welding method includes: step one, connecting the welding parts of the first part and the second part, fixing the first part and the second part of the mold, and keeping the first part and the second part of the mold fixed in subsequent steps two and three.

[0021] Step 2: heat the first part and the second part of the mold.

[0022] Step 3: welding the first part and the second part of the mold at the welding position within the predetermined heating treatment time.

[0023] Regarding step one, before carrying out step one, the first part can be subjected to surface treatments such as rough machining, heat treatment, fine machining, polishing, and nitriding, and the second part can be subjected to rough machining and fine machining, and the first part and the second part can be tested to be qualified in terms of size requirements.

[0024] For the first part that has been surface-treated by a nitriding process or the like, the welding part of the first part can be polished before step 1 to remove the nitriding layer or the like surface-treated layer so that the welding part of the first part meets the welding requirements.

[0025] Compared with the existing technology, surface treatment of the entire mold can reduce the surface treatment area and reduce the surface treatment cost. In step one, the first part and the second part of the mold are installed on the welding tooling so that the first part and the second part of the mold can be kept fixed in the subsequent steps two and three. The positions of the two parts can be fixed by local concave-convex matching or screw connection of the first part and the second part, or by using a clamp to keep the positions of the two parts fixed.

[0026] Regarding step two, in step two, the first part and the second part of the mold are heated to at least 290°C and kept warm for at least 30 minutes. By heating and keeping warm at sufficient temperature and time, the temperature of at least the welding part of the first part and the second part in step three can be above 150°C, further reducing the probability of weld cracking.

[0027] In step 2, the first part and the second part of the mold are placed in a heating furnace for heating.

[0028] Regarding step three, in step three, firstly, a first layer of spot welding is performed on the welding parts of the first part and the second part of the mold.

[0029] Then, after the first layer of spot welding is completed, at least one layer of welding is performed on the welding parts of the first part and the second part of the mold to fully weld the welding parts.

[0030] When spot welding the first layer, the spot welding current is not greater than 90A, and the welding point of each spot welding is not greater than 1mm.

[0031] When performing at least one layer of welding, the welding current of each layer shall not exceed 100A, and the welding length of each layer shall not exceed 10mm.

[0032] In further implementation, in step three, at least two layers of welding are performed, and each layer of welding is cooled for 15 to 30 minutes before the next layer of welding is performed until the welding parts of the first part and the second part of the mold are fully welded. In this embodiment, after each layer of welding is completed and cooled, at least the temperature of the welding part of the first part and the second part must be maintained above 150°C.

[0033] Taking the example of performing two layers of welding after the first layer of spot welding is completed, in step three, after the first layer of spot welding is completed, the second layer of welding is performed on the welding parts of the first part and the second part of the mold, the second layer welding current is not greater than 100A, and the second layer welding length each time is not greater than 10mm.

[0034] After the second layer of welding is completed and cooled for 15 to 30 minutes, the third layer of welding is performed using the same process as the second layer of welding until the welding parts of the first and second parts of the mold are fully welded. The third layer of welding current is not more than 100A, and the third layer of welding length is not more than 10mm each time.

[0035] Since each welding is equivalent to heating the welding part, the temperature of at least the welding part of the first part and the second part can be kept above 150° C. for a long time.

[0036] Spot welding and welding with a smaller welding current and a shorter welding length can greatly reduce the welding temperature, making the welding temperature closer to the heating temperature in step 2 and reducing the welding deformation.

[0037] In the second embodiment, based on the first embodiment, a diagonally symmetrical process is used to perform electric welding and soldering.

[0038] In this embodiment, when performing the first layer of spot welding, the first layer of spot welding is performed on the welding parts of the first part and the second part of the mold using a diagonally symmetrical spot welding process.

[0039] When performing at least one layer of welding, a diagonally symmetrical welding process is used to perform at least one layer of welding on the welding positions of the first part and the second part of the mold.

[0040] By using smaller welding current and shorter welding length for spot welding and welding combined with diagonally symmetrical spot welding and welding processes, it is possible to allow the previously welded parts to cool for a period of time before welding the diagonally symmetrical positions after one welding to avoid excessive local temperatures, further making the welding parts evenly stressed and heated, and reducing the lateral welding deformation rate during welding.

[0041] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A method for assembling and welding mold parts, characterized in that: include: Step 1: Connect the welding parts of the first part and the second part, fix the first part and the second part of the mold, and keep the first part and the second part of the mold fixed in the subsequent steps 2 and 3; Step 2, heating the first part and the second part of the mold; Step 3: welding the first part and the second part of the mold at the welding position within the predetermined heating treatment time.

2. A mold parts assembly and welding method according to claim 1, characterized in that: In step 2, the first part and the second part of the mold are heated to at least 290° C. and kept warm for at least 30 minutes, so that in step 3, the temperature of at least the welding part of the first part and the second part is above 150° C.

3. A mold parts assembly and welding method according to claim 1, characterized in that: In step 2, the first part and the second part of the mold are placed in a heating furnace for heating.

4. A mold parts assembly and welding method according to claim 1, characterized in that: In step three, firstly, a first layer of spot welding is performed on the welding parts of the first part and the second part of the mold; Then, after the first layer of spot welding is completed, at least one layer of welding is performed on the welding parts of the first part and the second part of the mold to fully weld the welding parts.

5. A mold parts assembly and welding method according to claim 4, characterized in that: When performing the first layer of spot welding, the first layer of spot welding is performed on the welding parts of the first part and the second part of the mold using a diagonally symmetrical spot welding process.

6. A mold parts assembly and welding method according to claim 4 or 5, characterized in that: When spot welding the first layer, the spot welding current is not greater than 90A, and the welding point of each spot welding is not greater than 1mm.

7. A mold parts assembly and welding method according to claim 4, characterized in that: When performing at least one layer of welding, a diagonally symmetrical welding process is used to perform at least one layer of welding on the welding positions of the first part and the second part of the mold.

8. A mold parts assembly and welding method according to claim 4 or 7, characterized in that: When performing at least one layer of welding, the welding current of each layer shall not exceed 100A, and the welding length of each layer shall not exceed 10mm.

9. A mold parts assembly and welding method according to claim 8, characterized in that: In step three, at least two layers of welding are performed, and each layer of welding is cooled for 15 to 30 minutes before the next layer of welding is performed until the welding parts of the first part and the second part of the mold are fully welded.

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