Heat treatment quenching method for hot work die steel

Abstract

The invention discloses a heat treatment quenching method for hot work die steel. The heat treatment quenching method comprises the following steps that S1, the die steel is put into a special quenching furnace; s2, closing the special quenching furnace, and carrying out sealed connection; s3, the special annealing furnace is subjected to vacuumizing treatment; s4, protective gas is injected into the special annealing furnace; s5, a special annealing furnace is ignited, and the die steel is heated for the first time and then air-cooled to the room temperature; S6, the die steel is heated for the second time, so that the die steel is austenitized; s7, the quenched die steel is heated for the third time and air-cooled to the room temperature; and S8, opening the special annealing furnace, and taking out the die steel. A traditional quenching furnace is specially modified, the two quenching furnaces are combined in a butt joint mode, quenching treatment on the ultra-long die steel can be achieved, the cost is reduced, meanwhile, strength reduction caused by welding after the die steel is cut off is avoided, and the structural strength is improved.

Description

Technical Field

[0001] The invention relates to the technical field of die steel, and in particular to a heat treatment and quenching method for hot working die steel. Background Art

[0002] With the development of modern industry, molds are used more and more widely. In products such as automobiles, electronics, instruments and meters, home appliances, aerospace, building materials, motors and communication equipment, about 60%-80% of the parts rely on mold processing and molding, so it is called the "mother of industry."

[0003] The total industrial output value of the world's mold industry has maintained continuous growth. At present, my country's total production of mold steel materials ranks among the top in the world, and there are many mold steel material manufacturers. However, the variety and quality level of mold steel materials are generally backward, which is specifically manifested as: mold steel materials with low technical content and added value are in oversupply. However, medium and high-end mold steel materials with high technical and added value are far from meeting the needs of my country's national economic development, and cannot be used to make large, precise, complex, and long-life die-casting molds for engines and motors, new energy vehicle bodies, battery boxes, and car cover molds. However, imported mold steel materials from abroad have shortcomings such as high cost and long production cycle. In order to meet the needs of industry development and customer use, it is urgent to design and produce a new type of hot working die steel to gradually replace imported materials under the conditions that meet customer use, so as to maximize the benefits for customers.

[0004] In the prior art, a quenching furnace is used to quench the mold steel. However, when quenching an extra-long mold steel, it is difficult for the traditional quenching furnace to accommodate such an extra-long mold steel. If the quenching furnace is customized separately, the cost increases. In the prior art, the mold steel is cut, placed in a quenching furnace for quenching, and then welded. This method greatly reduces the strength of the mold steel and is difficult to meet the quality requirements.

[0005] Therefore, how to provide a heat treatment quenching method for hot working die steel to solve the problems existing in the prior art is of great significance to its application. Summary of the invention

[0006] In view of this, the purpose of this application is to provide a heat treatment quenching method for hot working die steel to solve the problem that traditional quenching furnaces are difficult to accommodate such extra-long die steel. If a quenching furnace is customized separately, the cost will increase. The existing technology cuts the die steel, puts it into the quenching furnace for quenching, and then welds it. This method will greatly reduce the strength of the die steel and it is difficult to meet the quality requirements.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A heat treatment and quenching method for hot working die steel comprises the following steps:

[0009] S1: Place the mold steel into a special quenching furnace;

[0010] S2: Combine the special quenching furnace and make a sealed connection;

[0011] S3: Vacuum the special annealing furnace;

[0012] S4: injecting protective gas into the special annealing furnace;

[0013] S5: The special annealing furnace is ignited to heat the mold steel for the first time, and then air-cooled to room temperature:

[0014] S6: reheating the mold steel to austenitize the mold steel;

[0015] S7: heating the mold steel after quenching treatment three times and air cooling to room temperature;

[0016] S8: Open the special annealing furnace and take out the mold steel.

[0017] Preferably, the protective gas in S4 is:

[0018] 1-3 parts of ammonia;

[0019] 1-5 parts of nitrogen;

[0020] Methanol 0.5-2 parts;

[0021] 1-3 parts of carbon dioxide.

[0022] Preferably, the specific steps of S5 are as follows: heating the mold steel to 750-800° C., keeping it warm for 2-4 hours, and then cooling it to 500° C. by furnace cooling.

[0023] Preferably, the specific steps of S6 are as follows: heating the mold steel to 1050-1150° C. and keeping it warm for 30-60 minutes to austenitize the mold steel.

[0024] Preferably, the specific steps of S7 are as follows: heating the mold steel after quenching treatment to 150-200° C., keeping it warm for 1-2 hours, and then air-cooling it to room temperature.

[0025] Preferably, the special quenching furnace includes quenching furnace one and quenching furnace two, the furnace openings of quenching furnace one and quenching furnace two are arranged opposite to each other, and a sliding track is installed at the bottom end of quenching furnace two.

[0026] Preferably, the furnace openings of the quenching furnace one and the quenching furnace two are respectively equipped with connecting flange one and connecting flange two.

[0027] Preferably, an upper support is installed at the top of the quenching furnace one, an upper electric telescopic rod is installed at the top of the upper support, and an upper connecting seat is installed at the telescopic end of the upper electric telescopic rod.

[0028] Preferably, a lower support is installed at the bottom end of the quenching furnace 2, a lower electric telescopic rod is installed at the bottom end of the lower support, and a lower connecting seat is installed at the telescopic end of the lower electric telescopic rod.

[0029] Preferably, the top ends of the connecting flange 1 and the connecting flange 2 are connected via an upper connecting seat, and the bottom ends of the connecting flange 1 and the connecting flange 2 are connected via a lower connecting seat.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention specially transforms the traditional quenching furnace and connects two quenching furnaces to achieve quenching treatment of extra-long mold steel, which reduces costs and also avoids the strength reduction caused by cutting the mold steel and then welding it, thereby improving the structural strength.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0033] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0035] Figure 1 is a flow chart of the method of the present invention;

[0036] Figure 2 It is a specially made quenching furnace in the figure of the present invention;

[0037] Figure 3 It is a structural diagram of the connecting seat in the present invention.

[0038] In the figure: 1. quenching furnace 1; 2. connecting flange 1; 3. upper support; 4. upper connecting seat; 5. upper electric telescopic rod; 6. connecting flange 2; 7. quenching furnace 2; 8. sliding track; 9. lower support; 10. lower electric telescopic rod; 11. lower connecting seat. DETAILED DESCRIPTION

[0039] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0040] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0041] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0042] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0043] See also Figure 1-3 The present invention provides a technical solution for a heat treatment and quenching method of hot working die steel, comprising the following steps:

[0044] S1: Place the mold steel into a special quenching furnace;

[0045] S2: Combine the special quenching furnace and make a sealed connection;

[0046] S3: Vacuum the special annealing furnace;

[0047] S4: injecting protective gas into the special annealing furnace;

[0048] S5: The special annealing furnace is ignited to heat the mold steel for the first time, and then air-cooled to room temperature:

[0049] S6: reheating the mold steel to austenitize the mold steel;

[0050] S7: heating the mold steel after quenching treatment three times and air cooling to room temperature;

[0051] S8: Open the special annealing furnace and take out the mold steel.

[0052] The protective gas in S4 is:

[0053] 1-3 parts of ammonia;

[0054] 1-5 parts of nitrogen;

[0055] Methanol 0.5-2 parts;

[0056] 1-3 parts of carbon dioxide.

[0057] The specific steps of S5 are as follows: heat the mold steel to 750-800°C, keep it warm for 2-4 hours, and then cool it down to 500°C by furnace cooling.

[0058] The specific steps of S6 are as follows: heat the mold steel to 1050-1150°C and keep it warm for 30-60 minutes to austenitize the mold steel.

[0059] The specific steps of S7 are as follows: heat the quenched mold steel to 150-200°C, keep it warm for 1-2 hours, and then air-cool it to room temperature.

[0060] The special quenching furnace comprises a quenching furnace 1 and a quenching furnace 2 7 . The furnace openings of the quenching furnace 1 and the quenching furnace 2 7 are arranged opposite to each other, and a sliding track 8 is installed at the bottom end of the quenching furnace 2 7 .

[0061] The furnace openings of the quenching furnace 1 and the quenching furnace 2 7 are respectively equipped with a connecting flange 1 2 and a connecting flange 2 6;

[0062] An upper support 3 is installed at the top of the quenching furnace 1, an upper electric telescopic rod 5 is installed at the top of the upper support 3, and an upper connecting seat 4 is installed at the telescopic end of the upper electric telescopic rod 5.

[0063] A lower support 9 is installed at the bottom end of the quenching furnace 2 7 , a lower electric telescopic rod 10 is installed at the bottom end of the lower support 9 , and a lower connecting seat 11 is installed at the telescopic end of the lower electric telescopic rod 10 .

[0064] The top ends of the connecting flange 1 2 and the connecting flange 2 6 are connected via an upper connecting seat 4 , and the bottom ends of the connecting flange 1 2 and the connecting flange 2 6 are connected via a lower connecting seat 11 .

[0065] During specific use, one end of the mold steel is placed in the quenching furnace 1, and then the quenching furnace 2 7 is moved close to the quenching furnace 1 through the sliding track 8 until the connecting flange 1 2 and the connecting flange 2 6 are docked, and then the lower electric telescopic rod 10 and the upper electric telescopic rod 5 are started, so that the top ends of the connecting flange 2 and the connecting flange 2 6 are connected through the upper connecting seat 4, and the bottom ends of the connecting flange 2 and the connecting flange 2 6 are connected through the lower connecting seat 11, completing the sealed docking of the quenching furnace 1 and the quenching furnace 2 7, and then the special annealing furnace is vacuumized, the mold steel is heated to 750-800°C, kept warm for 2-4 hours, and then cooled to 500°C by furnace cooling; the mold steel is heated to 1050-1150°C, kept warm for 30-60 minutes, so that the mold steel is austenitized; the mold steel after quenching treatment is heated to 150-200°C, kept warm for 1-2 hours, and then air-cooled to room temperature to complete quenching.

[0066] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A heat treatment and quenching method for hot working die steel, characterized in that: The following steps are involved: S1: Place the die steel into a special quenching furnace; S2: Combine the special quenching furnace and make a sealed connection; S3: Vacuum the special annealing furnace; S4: injecting protective gas into the special annealing furnace; S5: The special annealing furnace is ignited to heat the mold steel for the first time, and then air-cooled to room temperature: S6: reheating the mold steel to austenitize the mold steel; S7: heating the quenched die steel three times and air cooling to room temperature; S7: Open the special annealing furnace and take out the mold steel.

2. A heat treatment and quenching method for hot working die steel according to claim 1, characterized in that: The protective gas in S4 is: 1-3 parts of ammonia; 1-5 parts of nitrogen; Methanol 0.5-2 parts; 1-3 parts of carbon dioxide.

3. A heat treatment and quenching method for hot working die steel according to claim 2, characterized in that: The specific steps of S5 are as follows: heating the mold steel to 750-800° C., keeping the temperature for 2-4 hours, and then cooling the temperature to 500° C. by furnace cooling.

4. A heat treatment and quenching method for hot working die steel according to claim 3, characterized in that: The specific steps of S6 are as follows: heating the mold steel to 1050-1150° C. and keeping the temperature for 30-60 minutes to austenitize the mold steel.

5. A heat treatment and quenching method for hot working die steel according to claim 4, characterized in that: The specific steps of S7 are as follows: heating the mold steel after quenching treatment to 150-200° C., keeping it warm for 1-2 hours, and then air cooling it to room temperature.

6. A heat treatment and quenching method for hot working die steel according to claim 5, characterized in that: The special quenching furnace comprises a quenching furnace one (1) and a quenching furnace two (7). The furnace openings of the quenching furnace one (1) and the quenching furnace two (7) are arranged opposite to each other, and a sliding track (8) is installed at the bottom end of the quenching furnace two (7).

7. A heat treatment and quenching method for hot working die steel according to claim 6, characterized in that: The furnace openings of the quenching furnace one (1) and the quenching furnace two (7) are respectively equipped with a connecting flange one (2) and a connecting flange two (6).

8. A heat treatment and quenching method for hot working die steel according to claim 7, characterized in that: An upper support (3) is installed at the top of the quenching furnace (1), an upper electric telescopic rod (5) is installed at the top of the upper support (3), and an upper connecting seat (4) is installed at the telescopic end of the upper electric telescopic rod (5).

9. A heat treatment and quenching method for hot working die steel according to claim 8, characterized in that: A lower support (9) is installed at the bottom end of the quenching furnace 2 (7), a lower electric telescopic rod (10) is installed at the bottom end of the lower support (9), and a lower connecting seat (11) is installed at the telescopic end of the lower electric telescopic rod (10).

10. A heat treatment and quenching method for hot working die steel according to claim 9, characterized in that: The top ends of the connecting flange 1 (2) and the connecting flange 2 (6) are connected via an upper connecting seat (4), and the bottom ends of the connecting flange 1 (2) and the connecting flange 2 (6) are connected via a lower connecting seat (11).

Images