A large-diameter seamless metal tee production system

Abstract

The present invention discloses a production system for large-diameter seamless metal tees, including production equipment and tee molds. Inside the upper mold of the tee mold, there is an inner mold that matches it. The upper hydraulic component of the production equipment is connected to the moving block at the top of the inner mold. The limiting block on the outer sidewall of the inner mold matches the limiting groove on the inner sidewall of the upper mold. U-shaped positioning grooves are provided on the sidewalls at the opening of the inner mold. On the top of the lower mold of the tee mold, there are positioning blocks that match the positioning grooves. A spring is connected between the pressing block at the bottom of the positioning block and the bottom of the sealing groove of the lower mold. At the bottom of the lower mold, there is an installation groove that matches the U-shaped demolding frame. The top of the demolding frame is connected to the arc-shaped demolding plate inside the lower mold, and the bottom of the demolding frame is connected to the lower hydraulic component of the production equipment. The production system for large-diameter seamless metal tees with the above structure is adopted in the present invention. When producing large-diameter tees, there is no need for welds, no potential hazards exist, and the production is time-saving and labor-saving.

Description

Technical Field

[0001] The present invention relates to the technical field of large-diameter three-way pipes, and particularly to a production system for large-diameter seamless metal three-way pipes. Background Art

[0002] A three-way pipe is also known as a pipe fitting three-way, a three-way pipe fitting or a three-way joint, etc., and is mainly used to change the fluid direction and is used at the branch pipe of the main pipeline. The forming methods of small-diameter three-way pipes are divided into two types: oil hydraulic bulging and hot pressing. Hydraulic bulging is a forming process in which a branch pipe is bulged out through axial compensation of metal materials. The hot pressing of the three-way pipe is formed through the radial compression of the pipe blank and the stretching process of the branch pipe part. For large-diameter three-way pipes, they are usually formed by welding between the branch pipe and the main pipe, with high technical precision requirements. If the processing operation is a little careless, welding defects such as virtual welding and false welding are likely to occur, thus bringing unnecessary hidden dangers. Summary of the Invention

[0003] The purpose of the present invention is to provide a production system for large-diameter seamless metal three-way pipes, which has no weld seam during the production of large-diameter three-way pipes, has no hidden dangers, and is time-saving and labor-saving in production.

[0004] To achieve the above purpose, the present invention provides a production system for large-diameter seamless metal three-way pipes, including a production device and a three-way pipe mold. An inner mold matching with the upper mold of the three-way pipe mold is arranged inside the upper mold. The upper hydraulic component of the production device is connected to the moving block at the top of the inner mold. The limiting block on the outer side wall of the inner mold matches with the limiting groove on the inner side wall of the upper mold. U-shaped positioning grooves are arranged on the side walls at the opening of the inner mold. A positioning block matching with the positioning groove is arranged at the top of the lower mold of the three-way pipe mold. A pressing block at the bottom of the positioning block is connected to the bottom of the sealing groove of the lower mold by a spring. An installation groove matching with a U-shaped demolding frame is arranged at the bottom of the lower mold. The top of the demolding frame is connected to an arc-shaped demolding plate inside the lower mold. The bottom of the demolding frame is connected to the lower hydraulic component of the production device.

[0005] Preferably, the sealing groove matches with the side wall of the inner mold, the pressing block matches with the sealing groove, and the positioning block is sleeved with a sealing sleeve.

[0006] Preferably, the demolding plate matches with the bottom of the lower mold.

[0007] Preferably, after the inner mold is connected to the lower mold, the inside of the two is a working cavity.

[0008] Preferably, the moving block matches with the moving groove at the top of the upper mold.

[0009] Preferably, the three-way die is divided into a three-way cold pressing die and a three-way hot pressing die. The diameter of the working cavity of the three-way cold pressing die is the same as the outer wall diameter of the finished three-way. The diameter of the working cavity of the three-way hot pressing die is the sum of the outer wall diameter of the finished three-way and its thermal expansion amount.

[0010] Preferably, the diameter range of the working cavity is 610 - 1219 mm.

[0011] Therefore, the present invention adopts a large-diameter seamless metal three-way production system with the above structure.

[0012] 1. When producing large-diameter three-ways, there is no need for welds, eliminating potential hazards, and the production is time-saving and labor-saving.

[0013] 2. The upper die and the lower die are tightly connected, and the quality of the produced finished three-ways is high.

[0014] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0015] Figure 1 is a side sectional view of the upper die of a large-diameter seamless metal three-way production system of the present invention;

[0016] Figure 2 is a side sectional view of the lower die of a large-diameter seamless metal three-way production system of the present invention;

[0017] Figure 3 is a front view when the three-way die of a large-diameter seamless metal three-way production system of the present invention is cold-pressed and formed.

[0018] Reference Numerals

[0019] 1. Upper die; 2. Inner die; 3. Lower die; 4. Moving block; 5. Limiting block; 6. Limiting groove; 7. Positioning groove; 8. Positioning block; 9. Sealing groove; 10. Pressing block; 11. Demolding frame; 12. Side hydraulic assembly; 13. Demolding plate; 14. Upper hydraulic assembly; 15. Lower hydraulic assembly. Detailed Description of the Invention

[0020] The technical solution of the present invention will be further described below through the drawings and embodiments.

[0021] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] Figure 1 is a front elevation sectional view of the upper die of a large-diameter seamless metal tee production system of the present invention, Figure 2 is a front elevation sectional view of the lower die of a large-diameter seamless metal tee production system of the present invention, Figure 3This is the front view during the cold pressing forming of the three-way die of a large-diameter seamless metal three-way production system of the present invention. As shown in the figure, a large-diameter seamless metal three-way production system includes production equipment and a three-way mold. Inside the upper mold 1 of the three-way mold, there is an inner mold 2 that matches it. The upper hydraulic component 14 of the production equipment is connected to the moving block 4 at the top of the inner mold 2. The limiting block 5 on the outer side wall of the inner mold 2 matches the limiting groove 6 on the inner side wall of the upper mold 1. U-shaped positioning grooves 7 are provided on the side walls at the opening of the inner mold 2. On the top of the lower mold 3 of the three-way mold, there is a positioning block 8 that matches the positioning groove 7. Between the pressing block 10 at the bottom of the positioning block 8 and the bottom of the sealing groove 9 of the lower mold 3, there is a spring connection. At the bottom of the lower mold 3, there is an installation groove that matches the U-shaped demolding frame 11. The top of the demolding frame 11 is connected to the arc-shaped demolding plate 13 inside the lower mold 3, and the bottom of the demolding frame 11 is connected to the lower hydraulic component 15 of the production equipment. When preparing the finished three-way, the upper hydraulic component 14 is connected to the moving block 4 of the upper mold 1, and the demolding frame 11 of the lower mold 3 is connected to the lower hydraulic component 15. The flat blank is placed inside the lower mold 3, and the upper hydraulic component 14 is started, so that the inner mold 2 moves relative to the upper mold 1 along the limiting groove 6. When the limiting block 5 is connected to the end of the limiting groove 6, the upper hydraulic component 14 drives the upper mold 1 to continue moving downward to connect with the lower mold 3. During the connection process of the upper mold 1 and the lower mold 3, as the positioning groove 7 and the positioning block 8 are gradually connected, the side wall of the inner mold 2 enters the sealing groove 9. After the positioning groove 7 and the positioning block 8 are completely connected, the top end of the positioning groove 7 contacts the pressing block 10, driving the pressing block 10 to continue moving downward until the upper mold 1 and the lower mold 3 are completely connected. At this time, a processing cavity for forming the three-way is formed between the inner mold 2 and the lower mold 3. During demolding, the upper mold 1 leaves the lower mold 3, and the lower hydraulic component 15 drives the demolding frame 11 to move upward, thereby driving the formed three-way on the demolding plate 13 to move upward, so that the formed three-way is demolded inside the lower mold 3. The setting of the spring ensures the tight connection between the positioning block 8 and the positioning groove 7 after the positioning groove 7 and the sealing groove 9 are completely connected. The setting of the positioning groove 7 and the positioning block 8 ensures the positioning connection between the upper mold 1 and the lower mold 3 and prevents displacement after their connection.

[0023] The sealing groove 9 matches the side wall of the inner mold 2, and the pressing block 10 matches the sealing groove 9, ensuring the sealed contact between the inner mold 2 and the lower mold 3.

[0024] The demolding plate 13 matches the bottom of the lower mold 3. The shape setting ensures that the formed three-way is completely removed from inside the lower mold 3. The demolding plate 13 contacts the bottom of the lower mold 3 during the preparation process.

[0025] The positioning block 8 is sleeved with a sealing sleeve, ensuring the sealed contact between the inner mold 2 and the lower mold 3 after the positioning block 8 is connected to the positioning groove 7.

[0026] After the inner mold 2 and the lower mold 3 are connected, the inside of the two is a working cavity for producing the formed three-way.

[0027] The moving block 4 matches the moving groove at the top of the upper tooling 1, ensuring that the top of the moving block 4 can be connected to the upper hydraulic component 14 outside the upper tooling 1.

[0028] The three-way tooling is divided into a three-way cold pressing tooling and a three-way hot pressing tooling. The diameter of the working cavity of the three-way cold pressing tooling is the same as the outer wall diameter of the finished three-way. The diameter of the working cavity of the three-way hot pressing tooling is the sum of the outer wall diameter of the finished three-way and its thermal expansion amount. The three-way cold pressing tooling is used for the formed three-way by cold pressing, and the three-way hot pressing tooling is used for the formed three-way by hot pressing.

[0029] Embodiment 1

[0030] A cold pressing forming method for a large-diameter seamless metal three-way (the three-way diameter is 610×19mm):

[0031] S1. Select the size of the three-way cold pressing tooling and the blank according to the finished three-way (the selection of the blank is shown in Table 1)

[0032] Table 1: Comparison table of different types of three-ways and blanks

[0033]

[0034] Connect the moving block 4 of the upper tooling 1 to the upper hydraulic component 14, and connect the lower tooling 3 to the lower hydraulic component 15;

[0035] S2. Check the hydraulic system pipelines and instruments before pressing, and conduct an empty vehicle trial run to ensure normal operation;

[0036] S3. Coat the blank with graphite powder and place the blank inside the lower tooling 3 of the production equipment;

[0037] S4. Start the upper hydraulic component 14, and the inner tooling 2 is hermetically connected to the lower tooling 3;

[0038] S5. Start the side hydraulic component 12 of the production equipment and the connected push plate to seal the end faces on both sides of the flat blank;

[0039] S6. Inject high-pressure water into the blank. Under the action of the high-pressure water, the blank flows along the working cavity towards the branch pipe to form a three-way prototype;

[0040] S7. Remove the side hydraulic component 12 and the high-pressure water, start the upper hydraulic component 14, separate the upper tooling 1 and the lower tooling 3, start the lower hydraulic component 15, and move the formed three-way or three-way prototype out of the lower tooling 3;

[0041] S8. When the one-time forming cannot meet the requirements, heat the three-way prototype, air-cool it to room temperature after taking it out of the furnace, and repeat steps S4 - S7 until the branch diameter height meets the requirements;

[0042] S9. Use a cutting machine to trim and shape the formed three-way joint to obtain the final finished three-way joint.

[0043] Example 2

[0044] A hot pressing forming method for a large-diameter seamless metal three-way joint (the diameter of the three-way joint is 1016×20 mm):

[0045] S1. Select the size of the three-way joint hot pressing mold and the blank according to the finished three-way joint (the selection of the blank is shown in Table 1). Connect the moving block 4 of the upper mold 1 with the upper hydraulic component 14, and connect the lower mold 3 with the lower hydraulic component 15.

[0046] S2. Before pressing, check the hydraulic system pipelines and instruments, and conduct an empty vehicle trial run to ensure normal operation. Before loading the furnace for heating, ensure uniform heating.

[0047] S3. Flatten the blank on the platform to obtain a flat blank, and the short-axis dimension of the flat blank is approximately the diameter of the finished three-way joint.

[0048] S4. Put the flat blank into the furnace and burn it through to ensure uniform heating of the flat blank. After taking out the flat blank, put two-thirds of it into water for cooling (the temperature for different materials is shown in Table 2).

[0049] Table 2: Processing conditions for different materials

[0050]

[0051] S5. Coat the inner mold 2 and the lower mold 3 with graphite powder, and use a forklift to put the flat blank into the lower mold 3 of the production equipment.

[0052] S6. Start the upper hydraulic component 14, and the inner mold 2 is hermetically connected to the lower mold 3. Under the action of pressure, the uncooled part flows along the working cavity towards the branch pipe to form a three-way joint prototype.

[0053] S7. Start the upper hydraulic component 14 to separate the upper mold 1 and the lower mold 3, and start the lower hydraulic component 15 to move the formed three-way joint or the three-way joint prototype out of the lower mold 3.

[0054] S8. When the requirements cannot be met in one forming, repeat steps S4 - S6 until both the main diameter and the branch diameter meet the requirements.

[0055] S9. Use a cutting machine to trim and shape the formed three-way joint to obtain the final finished three-way joint.

[0056] Therefore, the present invention adopts a production system for a large-diameter seamless metal three-way joint with the above structure. When producing a large-diameter three-way joint, there is no need for a weld seam, no hidden dangers, and the production is time-saving and labor-saving.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A large-diameter seamless metal tee production system, characterized in that: It includes production equipment and a three-way tool. Inside the upper tool of the three-way tool, there is an inner tool that matches it. The upper hydraulic component of the production equipment is connected to the moving block at the top of the inner tool. The limiting block on the outer sidewall of the inner tool matches the limiting groove on the inner sidewall of the upper tool. U-shaped positioning grooves are provided on the sidewalls at the opening of the inner tool. At the top of the lower tool of the three-way tool, there is a positioning block that matches the positioning groove. A compression block at the bottom of the positioning block is connected to the bottom of the sealing groove of the lower tool by a spring. At the bottom of the lower tool, there is an installation groove that matches the U-shaped demoulding frame. The top of the demoulding frame is connected to the arc-shaped demoulding plate inside the lower tool. The bottom of the demoulding frame is connected to the lower hydraulic component of the production equipment; The sealing groove matches the sidewall of the inner tool. The compression block matches the sealing groove. The positioning block is sleeved with a sealing sleeve; The demoulding plate matches the bottom of the lower tool; During the connection process of the upper tool and the lower tool, after the positioning groove and the positioning block are gradually connected, the sidewall of the inner tool enters the sealing groove. After the positioning groove and the positioning block are completely connected, the top of the positioning groove contacts the compression block, driving the compression block to continue moving downward until the upper tool and the lower tool are completely connected; After the inner tool and the lower tool are connected, the inside of them is the working cavity.

2. The large-diameter seamless metal tee production system according to claim 1, wherein: The moving block matches the moving groove at the top of the upper tool.

3. A large-diameter seamless metal tee production system according to claim 1, characterized in that: The three-way tool is divided into a three-way cold pressing tool and a three-way hot pressing tool. The diameter of the working cavity of the three-way cold pressing tool is the same as the outer wall diameter of the finished three-way. The diameter of the working cavity of the three-way hot pressing tool is the sum of the outer wall diameter of the finished three-way and its thermal expansion amount.

4. A large-diameter seamless metal tee production system according to claim 1, characterized in that: The diameter range of the working cavity is 610 - 1219 mm.

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