A post-welding stress relief method for press bed

Abstract

The present invention discloses a post-weld stress relief method for a press bed, including a welding machine, annealing heat treatment and machining steps. Among them, annealing heat treatment is the key, and parameters such as heating time, holding time, cooling time and maximum temperature need to be set through a control terminal. These parameters are located on a two-dimensional function curve of the process, which is convenient for precise control. The heating time is about 10-11 hours, the holding time is 2.5-3 hours, and the cooling time is 5-6 hours. The welded machine tool is transported to an annealing furnace by a trolley for annealing and transported out after completion. In addition, the control terminal is provided with a storage and call module, which can store and call the set two-dimensional function curve to improve the convenience of operation. The method effectively removes welding internal stress, reduces deformation and cracking of the machine tool, and improves the overall performance and reliability of the machine tool by finely controlling the annealing heat treatment process. The whole process is efficient and accurate, and is suitable for post-weld stress relief treatment of large welded structures such as press beds.

Description

Technical Field

[0001] The invention relates to a method for relieving stress of a press machine bed after welding. Background Art

[0002] At present, in the field of press manufacturing, the bed and gear parts generally use the welded structure of medium and thick plates as the main structural form. This structure has the advantages of high strength, good rigidity, and high material utilization, but it also brings problems such as a large number of welds, a large amount of welding, and high welding internal stress.

[0003] Since a lot of heat is generated during welding, the weld and its surrounding areas expand due to heat, and shrink rapidly when cooled, thus generating large internal stress inside the weld and in the surrounding materials. If these internal stresses are not effectively removed, they will be gradually released during subsequent use, causing deformation and cracking. Especially for processed parts, since they have undergone precision machining, any slight deformation may have a serious impact on the performance and precision of the parts, and even cause the parts to be scrapped. Summary of the invention

[0004] The purpose of the present invention is to solve the above deficiencies in the prior art and to provide a post-welding stress relief method for a press machine bed.

[0005] A post-welding stress relief method for a press machine bed comprises the following steps:

[0006] S1: welding machine tool;

[0007] S2: annealing heat treatment of the machine tool;

[0008] S3: machining the machine tool of step S2;

[0009] The annealing heat treatment comprises the following steps:

[0010] S2.1: Setting the parameters of annealing heat treatment through the control terminal;

[0011] S2.2: transport the welded machine tool to the annealing furnace and start the annealing furnace;

[0012] S2.3: Ship out the machine tool after annealing.

[0013] In this example, the parameters of the annealing heat treatment include heating time, holding time, cooling time, and maximum temperature.

[0014] In this example, the maximum temperature is 600±20°C.

[0015] In this example, the heating time is 10-11 hours.

[0016] In this example, the insulation time is 2.5-3 hours.

[0017] In this example, the cooling time is 5-6 hours.

[0018] In this example, the welded machine tool is transported by a trolley.

[0019] In this example, the parameter setting of the control terminal is located on a two-dimensional function curve of the process, where the Y axis of the two-dimensional function curve is temperature and the X axis is time.

[0020] In this example, the control terminal is provided with a storage calling module, which is used to store the two-dimensional curve of the setting function and apply it when needed.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0022] After the press machine bed is annealed and heat treated, the bed processing accuracy is stable and there is no deformation problem caused by stress release; the bed is subjected to post-weld annealing treatment, which reduces the cracking rate of the bed weld and improves the pass rate.

[0023] By setting the parameters of annealing heat treatment, including heating time, holding time, cooling time and maximum temperature through the control terminal, the entire annealing process can be accurately controlled to ensure that the machine tool receives appropriate heat treatment during the annealing process, thereby effectively removing welding stress.

[0024] Heating time, holding time and cooling time all have clear setting ranges, which helps to achieve efficient processing. For example, heating time is 10-11 hours, holding time is 2.5-3 hours, and cooling time is 5-6 hours. These time settings ensure processing effect while also ensuring processing efficiency.

[0025] The maximum temperature is set at 600±20℃. This temperature range ensures that the machine tool material can be heated evenly without being too high to damage the material performance. Stable temperature control helps achieve better stress relief effect.

[0026] The welded machine tool is transported by a trolley, which not only improves the transportation efficiency but also facilitates the movement and operation of the machine tool during the annealing process.

[0027] The parameter settings of the control terminal are located on the two-dimensional function curve of the process, which makes the parameter settings more intuitive and visual. The operator can clearly see the trend of temperature and time, making it easier to adjust and optimize the annealing process.

[0028] The control terminal is equipped with a storage and call module, which can store the set function two-dimensional curve and call it when needed. This not only facilitates the reuse of parameters, but also improves work efficiency and accuracy.

[0029] Through precise annealing treatment, the stress generated during the welding process of the machine tool can be effectively removed, thereby improving the overall performance and stability of the machine tool. This is of great significance for improving the processing accuracy and service life of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of machine tool welding;

[0031] Figure 2 It is the process flow chart of annealing heat treatment;

[0032] Figure 3 is a schematic diagram of a two-dimensional curve of a process function in this embodiment;

[0033] Figure 4 It is a comparison table of parameter settings. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0035] A post-welding stress relief method for a press machine bed comprises the following steps:

[0036] S1: welding machine tool;

[0037] S2: annealing heat treatment of the machine tool;

[0038] S3: machining the machine tool of step S2;

[0039] The annealing heat treatment comprises the following steps:

[0040] S2.1: Setting the parameters of annealing heat treatment through the control terminal;

[0041] S2.2: transport the welded machine tool to the annealing furnace and start the annealing furnace;

[0042] S2.3: Ship out the machine tool after annealing.

[0043] In this example, the parameters of the annealing heat treatment include heating time, holding time, cooling time, and maximum temperature.

[0044] In this example, the maximum temperature is 600±20°C.

[0045] In this example, the heating time is 10-11 hours.

[0046] In this example, the insulation time is 2.5-3 hours.

[0047] In this example, the cooling time is 5-6 hours.

[0048] In this example, the welded machine tool is transported by a trolley.

[0049] In this example, the parameter setting of the control terminal is located on a two-dimensional function curve of the process, where the Y axis of the two-dimensional function curve is temperature and the X axis is time.

[0050] In this example, the control terminal is provided with a storage calling module, which is used to store the setting function two-dimensional curve and apply it when needed.

[0051] Instructions: Open the control computer of the annealing furnace and set the process curve of annealing heat treatment, such as Figure 1 ; Input each parameter of the process curve through the computer, and refer to the process curve parameters Figure 4 The computer will display the entire process curve and then store it for future reuse. After extracting the required process curve, select the run function. For annealing heat treatment, select the highest temperature of 600±20℃.

[0052] Hoist the welded bed onto the trolley of the annealing furnace and place it steadily. After closing the furnace door, start the equipment using the operation method of step 1 above. The annealing furnace starts to heat up from room temperature to 300°C, and then to 600±20°C at 55°C / h. The entire heating time is controlled within 10 to 11 hours. After the temperature reaches 600°C, keep it warm for 2.5 to 3 hours; after the insulation is completed, cool it down to 250-300°C at a rate of 55°C / h, and the cooling time is controlled within 5 to 6 hours. When the cooling reaches 300°C, open the annealing furnace door, take the trolley out of the annealing furnace and place it in the air for natural cooling.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A post-welding stress relief method for a press machine bed, characterized in that: The following steps are involved: S1: welding machine tool; S2: annealing heat treatment of the machine tool; S3: machining the machine tool of step S2; Annealing heat treatment The following steps are involved: S2.1: Setting the parameters of annealing heat treatment through the control terminal; S2.2: transport the welded machine tool to the annealing furnace and start the annealing furnace; S2.3: Ship out the machine tool after annealing.

2. A post-weld stress relief method for a press machine bed according to claim 1, characterized in that: The parameters in annealing heat treatment include heating time, holding time, cooling time and maximum temperature.

3. A post-weld stress relief method for a press machine bed according to claim 2, characterized in that: The maximum temperature is 600±20°C.

4. A post-weld stress relief method for a press machine bed according to claim 2, characterized in that: The heating time is 10-11 hours.

5. The post-welding stress relief method for a press machine bed according to claim 2, characterized in that: The heat preservation time is 2.5-3 hours.

6. A post-weld stress relief method for a press machine bed according to claim 2, characterized in that: The cooling time is 5-6 hours.

7. A post-weld stress relief method for a press machine bed according to claim 1, characterized in that: The welded machine tool is transported by a trolley.

8. A post-weld stress relief method for a press machine bed according to claim 1, characterized in that: The parameter setting of the control terminal is located on a two-dimensional function curve of the process, where the Y axis of the two-dimensional function curve is temperature and the X axis is time.

9. A post-weld stress relief method for a press machine bed according to claim 8, characterized in that: The control terminal is provided with a storage calling module, which is used to store a two-dimensional curve of a setting function and apply it when needed.

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