A water spraying structure device suitable for double-joint and triple-joint heat treatment water jacket

Abstract

A kind of be applicable to double joint, three joint heat treatment water jacket water spraying structure device, including upper water jacket and lower water jacket, upper water jacket is located above lower water jacket;Upper water jacket includes upper template and several lower templates, and several lower templates are fixedly installed in the lower end of upper template, and the gap for placing hanging joint is left between several lower templates, and the facade of lower template towards gap is provided with several side drainage holes, and the lower surface of upper template is provided with several top drainage holes;Lower water jacket includes lower die box, and the inner surface of lower die box is provided with several lower water spraying holes, and the lower part of lower die box is provided with flow groove;The overall cooling effect of casting or forge piece is uniform, and the hardness uniformity of its surface is good;Avoid because of uneven water spraying creates product cooling effect uneven, finally leads to product hardness unqualified;The device well guarantees quenching layer depth and the mechanical property of material.

Description

Technical fields:

[0001] This invention relates to the field of material processing technology, and more specifically to a water jacket spray structure device for double-joint and triple-joint heat treatment. Background technology:

[0002] Metal heat treatment is one of the important processes in machinery manufacturing. Heat treatment is a material processing technology that involves heating, holding, and cooling metal materials to change their microstructure, thereby obtaining the desired performance characteristics. Compared with traditional box furnace heating, (1) continuous furnaces can improve the production efficiency of enterprises; (2) ensure the uniformity of various product properties. In continuous furnace heat treatment, the cooling stage is the most important stage, and the core component of the cooling stage is the cooling device. Selecting a suitable cooling device can maximize the optimization of various product properties.

[0003] For track lifting joints, to ensure the high-temperature phase (austenite) in the steel transforms into the low-temperature metastable phase (martensite) during cooling, the cooling rate must exceed the steel's critical cooling rate. During the cooling process, there is a difference in cooling rate between the surface and the core of the workpiece. If this difference is large enough, the portion exceeding the critical cooling rate may transform into martensite, while the core portion below the critical cooling rate may not transform. To ensure the entire cross-section transforms into martensite, a quenching medium with sufficient cooling capacity and a good cooling device are required to guarantee a sufficiently high cooling rate in the core of the workpiece. However, a high cooling rate can cause internal stress due to uneven thermal expansion and contraction, potentially leading to deformation or cracking of the workpiece. Therefore, considering these two conflicting factors, the rational selection of the quenching medium and cooling method is crucial.

[0004] When water is sprayed onto the arc-shaped water jacket, the product cannot be completely quenched. It is necessary to spray water for a long time to cool the surface of the casting. The parts that are not directly sprayed with water rely solely on the heat conduction of the casting to achieve the cooling effect. This will result in the product having unqualified hardness, thus leading to unqualified quality. Summary of the Invention:

[0005] To solve the above problems and overcome the shortcomings of the prior art, the present invention provides a water jacket spray structure device suitable for double-joint and triple-joint heat treatment, including an upper water jacket and a lower water jacket, with the upper water jacket located above the lower water jacket;

[0006] The upper water jacket includes an upper template and several lower templates. The lower templates are all fixedly installed at the lower end of the upper template. There is a gap between the lower templates for placing the hanger joints. Several side drainage holes are provided on the vertical surface of the lower template facing the gap. Several top drainage holes are provided on the lower surface of the upper template.

[0007] The water jacket includes a lower mold box, with several water spray holes on the inner surface of the lower mold box, and a drainage groove at the bottom of the lower mold box.

[0008] Furthermore, two U-shaped arms are fixedly connected to each of the left and right sides of the upper template, an upper template cavity is provided inside the upper template, and two upper water inlet pipes are fixedly connected to each of the front and rear sides of the upper template, and the upper water inlet pipes are connected to the upper template cavity.

[0009] Furthermore, four strip-shaped drainage channels are provided at the lower end of the upper template, and the positions of the strip-shaped drainage channels correspond to those of the lower template.

[0010] Furthermore, the lower template includes side templates, and there are two side templates in total. The two side templates are fixedly installed at the two strip drainage channels on both sides. The side templates have side template cavities inside, and the side template cavities are connected to the strip drainage channels.

[0011] Several side drainage holes are provided on the side of the side formwork facing the gap, and several bottom drainage holes are provided at the lower end of the side formwork.

[0012] Furthermore, the lower template also includes an intermediate template. There are two intermediate templates. The two intermediate templates are fixedly installed on the two inner strip drainage channels. The interior of the intermediate template has an intermediate template cavity, which is connected to the strip drainage channels.

[0013] Several side drainage holes are provided on both sides of the middle template, and several bottom drainage holes are provided at the bottom of the middle template.

[0014] Furthermore, the lower mold box is designed as a bowl-shaped structure, with a lower mold box cavity inside. Several water inlet pipes are installed on the outer surface of the lower mold box, and the water inlet pipes are connected to the lower mold box cavity. Several water spray holes are also connected to the lower mold box cavity.

[0015] Furthermore, there are three drainage channels, which are isolated from the lower mold box cavity. The upper end of the drainage channel is connected to the inner surface of the lower mold box, and the lower end of the drainage channel is connected to the outer surface of the lower mold box.

[0016] Furthermore, a central effluent channel is provided at the lower end of the lower mold box. The upper end of the central effluent channel is connected to the inner surface of the lower mold box, and the lower end of the central effluent channel is connected to the outer surface of the lower mold box.

[0017] Furthermore, the lower mold box is made of 40Cr steel.

[0018] Furthermore, it also includes supporting equipment, including a frame, with a travel rail on the upper part of the frame, and a travel seat connected to the travel rail in a freely movable manner. The travel seat is connected to the U-shaped arm by bolts, and the upper water jacket can move with the travel seat.

[0019] The water jacket is fixedly mounted on the machine frame;

[0020] It also includes a water supply device, which is connected to the upper and lower water inlet pipes via water pipes.

[0021] The beneficial effects of this invention are:

[0022] (1) The overall cooling effect of the casting or forging is uniform, and the surface hardness is uniform; avoid uneven cooling effect caused by uneven water spraying, which will eventually lead to unqualified product hardness.

[0023] (2) This device effectively ensures the depth of the hardened layer and the mechanical properties of the material.

[0024] (3) By using a reasonable water spraying method, we can ensure product performance, improve the company's production efficiency, and reduce the company's production costs.

[0025] (4) Reduced labor costs: Fully automatic water jacket spraying equipment greatly reduces labor costs. Attached image description:

[0026] Figure 1 This is a schematic diagram of the upper mold box structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the template structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the side template structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the intermediate template structure of the present invention;

[0030] Figure 5 This is a bottom view of the lower mold box of the present invention;

[0031] Figure 6 This is a top view of the lower mold box of the present invention;

[0032] Figure 7 This is a cross-sectional view of the lower mold box of the present invention;

[0033] In the attached image:

[0034] 1. Upper template, 2. Top drainage hole, 3. U-shaped arm, 4. Upper water inlet pipe, 5. Upper water inlet, 61. Side template, 62. Middle template, 7. Bottom drainage hole, 8. Side drainage hole, 9. Strip drainage channel, 10. Strip water inlet channel, 11. Lower mold box, 12. Lower water inlet pipe, 13. Middle drainage channel, 14. Lower base plate, 15. Drainage channel, 16. Upper base plate, 17. Lower water inlet, 18. Lower mold box cavity, 19. Lower spray hole. Detailed implementation method:

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the following description will be provided in conjunction with the appendix of this invention. Figure 1 ~Attached Figure 7 The present invention will be described in more detail below.

[0036] The present invention provides a water jacket spray structure device suitable for double-joint and triple-joint heat treatment, comprising an upper water jacket and a lower water jacket, with the upper water jacket located above the lower water jacket; the upper water jacket includes an upper template 1 and several lower templates, all of which are fixedly installed at the lower end of the upper template 1, with gaps between the lower templates for placing lifting joints, and several side drainage holes 8 provided on the vertical surface of the lower templates facing the gaps, and several top drainage holes 2 provided on the lower surface of the upper template 1; the lower water jacket includes a lower mold box 11, with several lower spray holes 19 provided on the inner surface of the lower mold box 11, and a drainage groove 15 provided at the lower part of the lower mold box 11; two U-shaped arms are fixedly connected to the left and right sides of the upper template 1, and the interior of the upper template 1 is provided with The upper template 1 has a cavity, and two upper water inlet pipes 4 are fixedly connected to the front and rear sides of the upper template 1, communicating with the cavity of the upper template 1. Four strip-shaped drainage channels are also provided at the lower end of the upper template 1, their positions corresponding to the lower template. The lower template includes two side templates 61, each fixedly installed at one of the two strip-shaped drainage channels on each side. Each side template 61 has a cavity inside, communicating with the strip-shaped drainage channels. The lower template also includes two middle templates 62, each fixedly installed at one of the two inner strip-shaped drainage channels. At the same location, the intermediate template 62 has an internal cavity that is connected to the strip drainage channel; several side drainage holes 8 are provided on both sides of the intermediate template 62, and several bottom drainage holes 7 are provided at the lower end of the intermediate template 62; the lower mold box 11 is designed as a bowl-shaped structure, with an internal cavity 18, and several lower water inlet pipes 12 are installed on the outer surface of the lower mold box 11, which are connected to the lower mold box cavity 18; several lower water spray holes 19 are also connected to the lower mold box cavity 18; three drainage channels 15 are provided, which are isolated from the lower mold box cavity 18, and the upper end of the drainage channels 15 is connected to the inner surface of the lower mold box 11. The lower end of the drain channel 15 is connected to the outer surface of the lower mold box 11; the lower end of the lower mold box 11 is also provided with a middle drain channel 13, the upper end of the middle drain channel 13 is connected to the inner surface of the lower mold box 11, and the lower end of the middle drain channel 13 is connected to the outer surface of the lower mold box 11; the lower mold box 11 is made of 40Cr steel; it also includes supporting equipment, including a frame, the upper part of the frame is provided with a traveling rail, a traveling seat is connected to the traveling rail in a freely movable manner, the traveling seat is connected to the U-shaped arm 3 by bolts, and the upper water jacket can move with the traveling seat; the lower water jacket is fixedly set on the frame; it also includes a water supply device, which is connected to the upper water inlet pipe 4 and the lower water inlet pipe 12 through a water pipe.

[0037] One embodiment of the present invention is as follows:

[0038] Bimetallic joints are manufactured using a tempering and medium-frequency induction process. A crucial step in this process is quenching, a term used in academic and industrial fields such as metal processing and heat treatment to refer to quenching as "dipping in fire." This term originates from the process method of dipping a heated workpiece into a medium to achieve the desired properties; craftsmen used to vividly describe quenching as "dipping in fire." Quenching involves heating steel above its critical temperature, holding it for a period to allow for complete or partial austenitization, and then cooling it at a rate greater than the critical temperature to below the Ms point (isothermal near the Ms point), transforming austenite into martensite or lower bainite. Quenching is an important means of strengthening steel, especially for workpieces with high mechanical properties. The cooling stage is a critical step in the quenching process, not only ensuring the part achieves a suitable microstructure and the required properties but also maintaining its dimensional and shape accuracy.

[0039] The water jacket device of this invention is mainly used for heat treatment of crawler crane boom double joints. Its reasonable structural design ensures uniform cooling of the castings, thereby guaranteeing their strength, toughness, and other mechanical properties. This replaces the traditional tempering + medium-frequency induction process with an overall quenching process, which not only improves heat treatment efficiency but also significantly reduces labor and production costs.

[0040] Most cooling devices are fixed in position and remain stationary. Products are automatically or manually moved to the designated cooling location to achieve the desired cooling effect. This device differs from existing technologies by consisting of two main parts: an upper water jacket and a lower water jacket. Their combined action ensures effective cooling. The upper water jacket moves with the machine, while the lower water jacket remains fixed in position. Furthermore, the lower water jacket requires sufficient strength to support the weight of the product. This device prevents uneven water spraying, improves production efficiency, and reduces production costs.

[0041] It is applicable to the water jacket spray structure device for double-joint and triple-joint heat treatment, including an upper water jacket and a lower water jacket. The upper water jacket is located above the lower water jacket and can be moved, while the lower water jacket is fixedly installed in a predetermined position.

[0042] The upper water jacket includes an upper template 1 and four lower templates. Two U-shaped arms are fixedly connected to each of the left and right sides of the upper template 1, for a total of four U-shaped arms 3. The U-shaped arms 3 are connected to the machine so that they can move, both vertically and horizontally. The upper template 1 has an upper template 1 cavity inside. Two upper water inlet pipes 4 are fixedly connected to each of the front and rear sides of the upper template 1. The upper water inlet pipes 4 are connected to the upper template 1 cavity and water is supplied to the upper template 1 cavity through the upper water inlet pipes 4.

[0043] The upper water inlet pipe 4 is provided with an upper water inlet 5 in the middle, and the upper water inlet 5 is connected to the upper template cavity.

[0044] The lower end of the upper template 1 is also provided with four strip drainage channels 9, the positions of which correspond to the lower template and are connected to the lower template through the strip drainage channels.

[0045] All four lower templates are fixedly installed at the lower end of the upper template 1. The four lower templates include two side templates 61 and two middle templates 62. The two side templates 61 are located on the outermost side, and the two middle templates 62 are located on the inner side of the two side templates 61. There is a gap between the four lower templates for placing the lifting joints, which allows the two joints of the crawler crane boom double joint to be inserted into the gap and sprayed with water directly at close range, thereby improving the quenching effect.

[0046] Each of the four lower templates has a strip-shaped water inlet groove 10 at its upper end, which corresponds to and is connected to the strip-shaped drainage groove 9.

[0047] Two side templates 61 are fixedly installed at the two strip drainage channels on both sides. The side template 61 has a cavity inside, which is connected to the strip drainage channel. The side template 61 has several side drainage holes 8 on one side facing the gap, and the other side is a closed structure. Cooling water can only be sprayed out from the side drainage holes 8 on the inside. The lower end of the side template 61 has several bottom drainage holes 7, where cooling water can also be sprayed out to cool the other structures of the crawler crane boom double joint.

[0048] Two intermediate templates 62 are fixedly installed on the inner side of two strip drainage channels. The interior of the intermediate template 62 is provided with an intermediate template 62 cavity, which is connected to the strip drainage channel. Several side drainage holes 8 are provided on both sides of the intermediate template 62, and cooling water can be sprayed from both sides. Several bottom drainage holes 7 are provided at the lower end of the intermediate template 62, where cooling water can also be sprayed to cool the other structures of the crawler crane boom double joint.

[0049] Meanwhile, the lower end of the upper template 1 is also provided with several top drainage holes 2, which can spray cooling water from the top.

[0050] The water supply device is connected to the upper water inlet pipe 4 through a water pipe to provide cooling water with a certain water pressure. The cooling water enters the upper mold 1 cavity from the upper water inlet pipe 4. Part of the cooling water is sprayed out from the top drain hole 2, and the other part of the cooling water enters the side mold 61 and the middle mold 62 through the strip water inlet trough. Then it is sprayed out from the side drain hole 8 and the bottom drain hole 7, so that the water in the upper mold box is sprayed onto the casting in time to achieve a good cooling effect.

[0051] The lower water jacket includes a lower mold box 11, which is designed as a bowl-shaped structure. The lower mold box 11 has a lower mold box cavity 18 inside. Four lower water inlet pipes 12 are installed on the outer surface of the lower mold box 11. The lower water inlet pipes 12 are connected to the lower mold box cavity 18 and are connected to a water supply device to supply water into the lower mold box 11. Several lower water spray holes 19 are provided on the inner surface of the lower mold box 11. All the lower water spray holes 19 are connected to the lower mold box cavity 18 and face obliquely upward. After the cooling water enters the lower mold box cavity 18, it can be sprayed out from the lower water spray holes 19 when it reaches a certain pressure and sprays towards the lower end of the double joint of the crawler crane boom.

[0052] A lower water inlet 17 is provided in the middle of the lower water inlet pipe 12, and the lower water inlet 17 is connected to the upper template cavity.

[0053] The lower part of the lower mold box 11 is provided with three arc-shaped drainage channels 15 to drain the cooling water in a timely manner, preventing the cooling effect of the product from being affected by excessively high water temperature. The three drainage channels 15 are isolated from the lower mold box cavity 18, so they will not affect the pressure of the cooling water. The upper end of the drainage channel 15 is connected to the inner surface of the lower mold box 11, and the lower end of the drainage channel 15 is connected to the outer surface of the lower mold box 11. The cooling water after spraying is directly drained away from the crab grass.

[0054] The lower mold box 11 is made of 40Cr steel, which has high strength and good load-bearing capacity, and the surface coating prevents rust.

[0055] The lower end of the lower mold box 11 is also provided with a middle drain channel 13. The upper end of the middle drain channel 13 is connected to the inner surface of the lower mold box 11, and the lower end of the middle drain channel 13 is connected to the outer surface of the lower mold box 11, thereby increasing the speed of cooling water discharge. It can also be sealed by a plug to adjust the water discharge speed.

[0056] It also includes supporting equipment, including a frame with a travel rail on the upper part of the frame. The travel rail is installed on a vertically movable longitudinal lifting platform. A travel seat is connected to the travel rail in a freely movable manner. The travel seat is connected to the U-shaped arm 3 by bolts. The upper water jacket can move with the travel seat. The lower water jacket is fixedly installed on the frame. It also includes a water supply device, which is connected to the upper water inlet pipe 4 and the lower water inlet pipe 12 through water pipes.

[0057] Another embodiment of the present invention is as follows:

[0058] The water jacket device of this invention consists of two parts: an upper water jacket and a lower water jacket. The upper water jacket includes an upper template 1 and three lower templates. The three lower templates include two side templates 61 and a middle side plate. All edges of the upper template 1 are connected by welding. Four U-shaped arms 3 are symmetrically opened at both ends on the left and right sides and are connected to the machine by bolts, so that the upper template 1 moves with the machine.

[0059] Six upper water inlet pipes 4 are opened at both ends and the middle, mainly connecting to cooling water pipes. Drainage holes are opened at the bottom area of ​​the upper mold 1 so that the water from the upper mold 1 can be sprayed onto the casting in time to achieve a good cooling effect. The three lower molds are connected to the upper mold 1 by welding.

[0060] The lower water jacket is an inverted hollow frustum-shaped structure, namely the lower mold box 11. The side material of the lower mold box 11 is made of high-strength 40Cr steel plate, which has a certain load-bearing capacity.

[0061] Several drainage holes are opened on the inner surface of the lower mold box 11 to spray out the cooling medium, thereby achieving the effect of product cooling. At the same time, the surface of the lower mold box 11 is coated to prevent rust. The bottom is a cylindrical stainless steel box, and the two are connected by welding. Three drainage grooves 15 are opened on the bottom side of the stainless steel box to drain the cooling water in time and prevent the cooling effect of the product from being affected by excessive water temperature.

[0062] The problem this invention aims to solve is the uneven hardness and microstructure caused by uneven cooling of the casting during the overall quenching process of heat treatment. Previously, when using water spray on arc-shaped water jackets, the product could not be completely quenched, requiring prolonged water spraying to cool the casting surface. Areas not directly sprayed with water relied solely on the casting's heat conduction for cooling, leading to substandard hardness and consequently, quality defects. This invention addresses these problems by employing a rationally designed structure that divides the water jacket into upper and lower mold boxes. These molds can be easily separated using a fully automated machine, resulting in improved practicality and convenience.

[0063] The lower mold box 11 is bowl-shaped and has a certain water storage capacity. Four water inlet pipes 12 are connected to the outside of the lower mold box 11, and three strip-shaped drain channels are opened on the bottom inside to smoothly discharge the coolant and achieve a good cooling effect for the product. A certain number of drain holes are opened on the inner side wall.

[0064] The following table compares the experimental results of traditional box furnace heat treatment and the heat treatment using the device provided by this invention: Box furnace heat treatment test results:

[0065]

[0066] This invention provides experimental results of heat treatment of the device:

[0067]

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water spraying structure device for double-joint and triple-joint heat treatment water jackets, characterized in that: The upper water jacket is located above the lower water jacket; The upper water jacket comprises an upper mold plate and a plurality of lower mold plates, the plurality of lower mold plates are fixedly installed at the lower end of the upper mold plate, gaps for placing the hanging joints are left between the plurality of lower mold plates, a plurality of side drainage holes are arranged on the facade of the lower mold plate towards the gaps, and a plurality of top drainage holes are arranged on the lower surface of the upper mold plate; The lower water jacket comprises a lower mold box, a plurality of lower water injection holes are arranged on the inner surface of the lower mold box, and a flow discharge groove is arranged at the lower part of the lower mold box; The lower mold plate comprises a side mold plate, two side mold plates are arranged, the two side mold plates are fixedly installed at the two strip-shaped drainage grooves on the two sides respectively, a side mold plate cavity is arranged in the side mold plate, and the side mold plate cavity is communicated with the strip-shaped drainage groove; One side of the side mold plate towards the gap is provided with a plurality of side drainage holes, and the lower end of the side mold plate is provided with a plurality of bottom drainage holes; The lower mold plate further comprises a middle mold plate, two middle mold plates are arranged, the two middle mold plates are fixedly installed at the two strip-shaped drainage grooves on the inner side respectively, a middle mold plate cavity is arranged in the middle mold plate, and the middle mold plate cavity is communicated with the strip-shaped drainage groove; The two side faces of the middle mold plate are each provided with a plurality of side drainage holes, and the lower end of the middle mold plate is provided with a plurality of bottom drainage holes.

2. The water spray structure device for double-joint, triple-joint heat treatment water jacket according to claim 1, characterized in that: Two U-shaped arms are fixedly connected to the left and right sides of the upper mold plate respectively, an upper mold plate cavity is arranged in the upper mold plate, two upper water inlet pipes are fixedly connected to the front and rear sides of the upper mold plate respectively, and the upper water inlet pipes are communicated with the upper mold plate cavity.

3. The water spray arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 2, characterized in that: The lower end of the upper mold plate is further provided with four strip-shaped drainage grooves, and the positions of the strip-shaped drainage grooves correspond to the lower mold plate.

4. The water spray structural arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 1, characterized in that: The lower mold box is arranged in a bowl structure, a lower mold box cavity is arranged in the lower mold box, a plurality of lower water inlet pipes are installed on the outer surface of the lower mold box, the lower water inlet pipes are communicated with the lower mold box cavity, and the plurality of lower water injection holes are communicated with the lower mold box cavity.

5. The water spray arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 4, characterized in that: The flow discharge groove is arranged in three, the flow discharge grooves are mutually separated from the lower mold box cavity, the upper end of the flow discharge groove is communicated with the inner surface of the lower mold box, and the lower end of the flow discharge groove is communicated with the outer surface of the lower mold box.

6. The water spray arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 4, characterized in that: The lower end of the lower mold box is further provided with a middle flow discharge groove, the upper end of the middle flow discharge groove is communicated with the inner surface of the lower mold box, and the lower end of the middle flow discharge groove is communicated with the outer surface of the lower mold box.

7. The water spray arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 4, characterized in that: The lower mold box is made of 40Cr steel material.

8. The water spray structural arrangement suitable for double-joint, triple-joint heat treatment water jacket according to claim 1, characterized in that: The device further comprises a matching device, the matching device comprises a rack, a walking track is arranged at the upper part of the rack, a walking seat is movably connected to the walking track, the walking seat is connected with the U-shaped arm through bolts, and the upper water jacket can move with the walking seat; The lower water jacket is fixedly arranged on the rack; The device further comprises a water supply device, the water supply device is communicated with the upper water inlet pipes and the lower water inlet pipes through water pipes.

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