Necking die capable of reducing necking loss

Abstract

The utility model discloses a necking die capable of reducing necking loss, which relates to the technical field of steel pipe production, and is characterized in that the width of a necking die block is corrected to be smaller than the width of a die body, specifically, the width of the die body is 100mm, and the width of the necking die block is 60mm, so that the necking length and the necking weight are obviously reduced, and when an HRSG pipe is produced, the production efficiency is greatly improved. The length of the cup bottom is reduced from 140 to 100 mm, the weight is reduced from 2.8 kg to 2.2 kg, waste caused by cutting after pipe jacking is reduced, and a large number of raw materials can be saved in the long-term production process. Meanwhile, the second mounting holes are formed in the mounting blocks, so that the structural strength of the necking module can be guaranteed, the necking module has good overall strength, the service life of the die set is prolonged, and the effect of prolonging the service life of the necking die capable of reducing the necking loss is achieved; and through the arrangement of a mounting groove, a movable connecting plate and a limiting angle block, the precision during mold closing after long-time use is guaranteed, and the necking quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe production, in particular to a necking die capable of reducing necking losses. Background Art

[0002] As an inherent process of the CPE unit, the shrinking process is used to fix the core rod head and the rough pipe to ensure that the rough pipe is tightly combined with the core rod and the jacking frame when it is deformed by the jacking pipe.

[0003] The main problem currently exists is that the necking length is long. The necking position is cut off after the pipe is jacked, which will cause corresponding weight loss and generate great waste. The necking length is related to the length of the existing necking mold. The existing necking mold (such as Figure 1 (as shown) is an arc-shaped mold body 1 having a first necking chamfer 11 and a first mounting hole 12. The width of the arc-shaped mold body 1 is relatively wide, which will result in a longer necking length after necking. In addition, the setting of the mounting hole also destroys the overall structure of the mold body, making the overall rigidity of the mold insufficient. Therefore, a necking mold that reduces necking losses is needed. Utility Model Content

[0004] The purpose of the present application is to provide a necking die that reduces necking losses, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a shrinking mold for reducing shrinkage loss, comprising a mold set, the mold set comprising a shrinking module having a width less than the width of the mold body and a mounting block having the same width as the mold body, the shrinking module being a block having an arc-shaped cross-section and an arc-shaped groove, the shrinking module being embedded in the mounting block, and a second shrinking chamfer being provided on one side of the shrinking module;

[0006] The mounting block is a square block, and a second mounting hole is formed on the mounting block.

[0007] Preferably, a mounting groove is provided on one side of the mounting block close to the necking module, and the necking module is movably embedded in the mounting groove through a connecting piece;

[0008] A limiting member is installed inside the open end of the installation groove to prevent the connecting member from being separated from the installation groove.

[0009] Preferably, the connecting member comprises a movable connecting plate, an upper end of which is fixed to an end surface of the necking module close to the mounting block, and the movable connecting plate is movably embedded in the mounting groove.

[0010] Preferably, the limiting member comprises a limiting angle block, two limiting angle blocks are provided, and the two limiting angle blocks are respectively fixed to the side walls on opposite sides of the installation groove;

[0011] The spacing between the two limiting angle blocks is smaller than the horizontal distance formed between the two ends of the movable connecting plate after the movable connecting plate is tilted in the installation groove.

[0012] Preferably, both ends of the movable connecting plate form arc-shaped ends with a semicircular cross section;

[0013] The opposite sides of the bottom wall of the installation groove are formed with arc bottom walls of the same arc as the arc end;

[0014] The side wall at the lower end of the limiting corner block in contact with the movable connecting plate also forms an arc-shaped side wall with the same arc as the arc-shaped end portion.

[0015] Preferably, a shrink mark having the same width as the shrink module is engraved on the end surface of the mounting block close to the shrink module.

[0016] In summary, the technical effects and advantages of the utility model are:

[0017] 1. In the utility model, by correcting the width of the necking module to be smaller than the width of the mold body, specifically, the width of the mold body is 100 mm, and the width of the necking module is 60 mm, so that the necking length and necking weight are significantly reduced. When producing HRSG pipes, the cup bottom length is reduced from 140 to 100 mm, and the weight is reduced from 2.8 kg to 2.2 kg, which reduces the waste generated when the pipe is cut off after the top pipe is pushed, and can save a lot of raw materials in the long-term production process;

[0018] At the same time, the second mounting hole is arranged on the mounting block, so as to ensure the structural strength of the necking module, so that the necking module has good overall strength, thereby improving the service life of the mold group and achieving the effect of extending the service life of the necking mold that reduces necking losses.

[0019] 2. In the utility model, the mounting block is movably connected to the necking module by setting the mounting groove, the movable connecting plate and the limiting angle block, so that the mounting block can produce a certain tilt deflection within a limited range, wherein the limited range is the spacing between the movable connecting plate in the mounting groove and the limiting angle block, so that a certain offset compensation space can exist between the necking modules when the multiple mold groups are molded, so that the multiple necking modules can be more tightly combined after the mold is closed, especially between the edges on the inner sides of the multiple necking modules, thereby reducing the gap between the multiple necking modules after the mold is closed due to the waste residue attached to the surface after long-term use, thereby ensuring the accuracy of the mold closing after long-term use and the necking quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a mold in the prior art;

[0022] Figure 2 Schematic diagram of the three-dimensional structure of the mold in this embodiment;

[0023] Figure 3 is a cross-sectional view of the mold in this embodiment;

[0024] Figure 4 for Figure 3 A magnified view of the structure at center;

[0025] Figure 5 It is a schematic diagram of displacement compensation when multiple molds are combined in this embodiment.

[0026] In the figure: 1, mold body; 11, first shrink chamfer; 12, first mounting hole;

[0027] 2. Die set; 21. Neck shrinking module; 211. Second neck shrinking chamfer; 22. Mounting block; 221. Second mounting hole; 222. Neck shrinking mark; 223. Mounting groove; 3. Active connecting plate; 4. Limiting angle block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example: Reference Figure 2-5 A shrinking die for reducing shrinkage loss is shown, comprising a die set 2, the die set 2 comprising a shrinking module 21 having a width less than that of a die body 1 and a mounting block 22 having the same width as the die body 1, the shrinking module 21 being a block with an arc-shaped cross section and an arc-shaped groove, the shrinking module 21 being embedded in the mounting block 22, and a second shrinking chamfer 211 being provided on one side of the shrinking module 21;

[0030] The mounting block 22 is a square block and is provided with a second mounting hole 221 .

[0031] Based on the above structure, by correcting the width of the necking module 21 to be smaller than the width of the mold body 1, specifically, the width of the mold body 1 is 100 mm, and the width of the necking module 21 is 60 mm, so that the necking length and necking weight are significantly reduced. When producing HRSG pipes, the cup bottom length is reduced from 140 to 100 mm, and the weight is reduced from 2.8 kg to 2.2 kg, which reduces the waste generated when the pipe is cut off after the top pipe is pushed, and can save a lot of raw materials in the long-term production process;

[0032] At the same time, the second mounting hole 221 is set on the mounting block 22, so as to ensure the structural strength of the necking module 21, so that the necking module 21 has good overall strength, thereby improving the service life of the mold group 2 and achieving the effect of extending the service life of the necking mold that reduces necking losses.

[0033] Furthermore, a mounting groove 223 is provided on one side of the mounting block 22 close to the necking module 21, and the necking module 21 is movably embedded in the mounting groove 223 through a connecting member, and the connecting member includes a movable connecting plate 3, the upper end of the movable connecting plate 3 is fixed to the end surface of the necking module 21 close to the mounting block 22, and the movable connecting plate 3 is movably embedded in the mounting groove 223;

[0034] A limiting member is installed inside the open end of the installation groove 223 to prevent the connecting member from being separated from the installation groove 223. The limiting member includes a limiting angle block 4. Two limiting angle blocks 4 are provided. The two limiting angle blocks 4 are respectively fixed to the side walls on opposite sides of the installation groove 223.

[0035] The distance between the two limiting corner blocks 4 is smaller than the horizontal distance formed between the two ends of the movable connecting plate 3 after the movable connecting plate 3 is tilted in the installation groove 223 .

[0036] By setting the mounting groove 223, the movable connecting plate 3 and the limiting angle block 4, the mounting block 22 is movably connected to the necking module 21, so that the mounting block 22 produces a certain tilt deflection within a limited range, wherein the limited range is the spacing between the movable connecting plate 3 in the mounting groove 223 and the limiting angle block 4, so that a certain offset compensation space can exist between the multiple necking modules 21 when the multiple mold groups 2 are molded, so that the multiple necking modules 21 are more tightly combined after the mold is molded, especially between the edges on the inner sides of the multiple necking modules 21, thereby reducing the gap between the multiple necking modules 21 after the mold is molded due to waste residue attached to the surface after long-term use, thereby ensuring the accuracy of the mold when being molded after long-term use and ensuring the necking quality.

[0037] Furthermore, both ends of the movable connecting plate 3 form arc-shaped ends with a semicircular cross section;

[0038] The opposite sides of the inner bottom wall of the installation groove 223 are formed with arc bottom walls having the same arc as the arc end;

[0039] The side wall at the lower end of the limiting corner block 4 in contact with the movable connecting plate 3 also forms an arc-shaped side wall with the same arc as the arc-shaped end portion.

[0040] By setting the arc-shaped end, the arc-shaped bottom wall and the arc-shaped side wall, the friction force generated during the relative movement between the movable connecting plate 3 and the mounting groove 223 and the limiting angle block 4 is reduced, thereby reducing the wear between the three and extending the service life of the shrinking mold that reduces shrinking losses to a certain extent.

[0041] Furthermore, the end face of the mounting block 22 close to the necking module 21 is engraved with a necking mark 222 having the same width as the necking module 21, so that the staff can quickly know the necking size of the corresponding mold group 2 when taking the mold group 2, thereby facilitating the staff to select the corresponding mold group 2 according to different usage requirements.

[0042] Working principle of the utility model: in daily use, by correcting the width of the necking module 21 to be smaller than the width of the mold body 1, specifically, the width of the mold body 1 is 100mm, and the width of the necking module 21 is 60mm, so that the necking length and necking weight are significantly reduced. When producing HRSG pipes, the cup bottom length is reduced from 140 to 100mm, and the weight is reduced from 2.8kg to 2.2kg, which reduces the waste generated when the pipe is cut off after the top pipe is pushed, and can save a lot of raw materials in the long-term production process;

[0043] At the same time, the second mounting hole 221 is arranged on the mounting block 22, so as to ensure the structural strength of the necking module 21, so that the necking module 21 has good overall strength, thereby improving the service life of the mold set 2, and achieving the effect of extending the service life of the necking mold that reduces necking loss;

[0044] In addition, by setting the mounting groove 223, the movable connecting plate 3 and the limiting angle block 4, the mounting block 22 is movably connected to the necking module 21, so that the mounting block 22 produces a certain tilt deflection within the limit range, wherein the limit range is the distance between the movable connecting plate 3 in the mounting groove 223 and the limiting angle block 4, so that a certain offset compensation space can exist between the multiple necking modules 21 when the multiple mold groups 2 are molded, so that the multiple necking modules 21 are more tightly combined after the mold is closed, especially between the edges on the inner side of the multiple necking modules 21, thereby reducing the gap between the multiple necking modules 21 after the mold is closed due to waste residue attached to the surface after long-term use, thereby ensuring the accuracy of the mold when closing after long-term use and ensuring the necking quality.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A necking die for reducing necking loss, comprising a die set (2), characterized in that: The mold assembly (2) comprises a necking module (21) whose width is smaller than that of the mold body (1) and a mounting block (22) whose width is equal to that of the mold body (1); the necking module (21) is a block having an arc-shaped cross section and an arc-shaped groove; the necking module (21) is embedded in the mounting block (22); and a second necking chamfer (211) is provided on one side of the necking module (21); The mounting block (22) is a square block, and a second mounting hole (221) is provided on the mounting block (22).

2. A necking die for reducing necking loss according to claim 1, characterized in that: A mounting groove (223) is provided on one side of the mounting block (22) close to the necking module (21), and the necking module (21) is movably embedded in the mounting groove (223) via a connecting piece; A limiting member is installed inside the open end of the installation groove (223) to prevent the connecting member from being separated from the installation groove (223).

3. A necking die for reducing necking loss according to claim 2, characterized in that: The connecting member comprises a movable connecting plate (3), the upper end of the movable connecting plate (3) is fixed to the end surface of the necking module (21) close to the mounting block (22), and the movable connecting plate (3) is movably embedded in the mounting groove (223).

4. A necking die for reducing necking loss according to claim 3, characterized in that: The limiting member comprises a limiting angle block (4), two limiting angle blocks (4) are provided, and the two limiting angle blocks (4) are respectively fixed to the side walls on opposite sides of the installation groove (223); The distance between the two limiting corner blocks (4) is smaller than the horizontal distance formed between the two ends of the movable connecting plate (3) after the movable connecting plate (3) is tilted in the installation groove (223).

5. A necking die for reducing necking loss according to claim 4, characterized in that: Both ends of the movable connecting plate (3) form arc-shaped ends with semicircular cross-sections; The opposite sides of the inner bottom wall of the installation groove (223) both form arc-shaped bottom walls with the same curvature as the arc-shaped end portion; The side wall at the lower end of the limiting angle block (4) in contact with the movable connecting plate (3) also forms an arc-shaped side wall with the same arc as the arc-shaped end portion.

6. A necking die for reducing necking loss according to claim 1, characterized in that: The end surface of the mounting block (22) close to the necking module (21) is engraved with a necking mark (222) having the same width as the necking module (21).

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