Outer die mechanism for steel pipe cold-drawing machine

Abstract

The utility model discloses an external mold mechanism for a steel pipe cold-drawing machine, which comprises an external mold main body, a molding cavity is arranged in the external mold main body, the molding cavity is suitable for extruding and molding a passing steel pipe, a transition belt and a sizing belt are arranged in the molding cavity, the steel pipe firstly passes through the transition belt and then passes through the sizing belt after entering the molding cavity, and the sizing belt is arranged in the molding cavity. The cooling assembly comprises a liquid inlet, a cooling channel and a liquid outlet, the cooling channel is located in the outer mold body and communicates with the liquid inlet and the liquid outlet, and the liquid outlet and the liquid inlet are both formed in the outer mold body and communicate with the outside. A cooling channel is formed in the outer mold main body, the cooling channel is annularly arranged in the outer mold main body, the cooling channel is not communicated with the molding cavity, and the annular cooling channel is arranged in the outer mold main body, so that cooling liquid uniformly and circularly flows in the outer mold main body, and a cooling effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel pipe processing equipment technical field, specifically, relate to a kind of outer mould mechanism for steel pipe cold-drawing machine. BACKGROUND

[0002] At present, in the field of steel pipe cold-drawing process, outer mould mechanism is the key component to ensure the size accuracy and surface quality of steel pipe, and the traditional cooling method relies on directly spraying coolant to the surface of outer mould to achieve the effect of cooling, but the direct cooling method also has various problems.

[0003] After searching, the patent with the announcement number CN202861020U discloses steel pipe cold-drawing machine outer mould mechanism, which aligns the outlet of steel pipe after the butt joint of outer mould sleeve and outer mould seat through the setting of limiting conical surface, reducing the waste of steel pipe; however, the patent lacks an effective outer mould cooling means, and can only cool directly by spraying coolant from outside, but this method has significant defects, such as uneven cooling effect, because the spraying of coolant may be affected by various factors, such as the layout of nozzle, the flow and pressure of coolant, and the shape and material of outer mould surface, etc., leading to uneven distribution of coolant on the surface of outer mould, which not only cannot effectively remove a large amount of heat generated during the work of mould, but also may cause overheating of some parts of mould, while other parts are not cooled enough, and the overheated parts of mould may expand due to continuous high temperature, affecting the precision and stability of mould, and even causing damage to mould in serious cases, while the parts not cooled enough may maintain high material strength due to high temperature, increasing the friction resistance and energy consumption during the drawing process of steel pipe, and also may cause residual stress in the internal of steel pipe due to temperature gradient, affecting the mechanical properties and corrosion resistance of steel pipe. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects in the prior art, and an annular cooling channel is arranged in the inner part of outer mould body to make the coolant circulate uniformly inside to achieve the effect of cooling.

[0005] To solve the above technical problems, the technical scheme of the utility model is an outer mould mechanism for steel pipe cold-drawing machine, which comprises:

[0006] An outer mould body;

[0007] A shaping cavity is arranged in the outer mould body, and the shaping cavity is suitable for extruding and shaping the passing steel pipe;

[0008] A transition zone and a sizing zone are arranged in the shaping cavity, and the steel pipe passes through the transition zone and then the sizing zone after entering the shaping cavity;

[0009] The cooling assembly comprises an inlet, a cooling channel and an outlet;

[0010] The cooling channel is located in the outer mold body and communicates with the inlet and the outlet, and the inlet and the outlet are both arranged on the outer mold body and communicate with the outside;

[0011] The cooling channel is arranged in a ring shape in the outer mold body, and the cooling channel and the molding cavity are not communicated with each other.

[0012] Further, the outer mold mechanism further comprises an outer mold seat connected with the outer mold body, and the outer mold seat is adapted to support the outer mold body;

[0013] The outer periphery of the outer mold body is provided with a butt joint block, and a step is arranged in the outer mold seat, and the butt joint block is matched with the step;

[0014] The axial one side of the outer mold body is an outlet end face, and the axial other side is an inlet end face;

[0015] After the step is connected with the butt joint block, the outlet end face of the outer mold body is flush with the corresponding end face of the outer mold seat.

[0016] Further, the width of the sizing belt in the axial direction of the outer mold body is mm-mm.

[0017] Further, the width of the transition belt in the axial direction of the outer mold body is mm-mm.

[0018] Further, two first buffer assemblies symmetrically arranged on the outlet end face of the outer mold body are arranged on the outlet end face of the outer mold body, and the first buffer assembly comprises a buffer plate and a first buffer pad;

[0019] The two buffer plates are respectively located on the upper and lower sides of the outlet end face of the outer mold body;

[0020] The first buffer pad is arranged on the outer end face of the buffer plate in the axial direction of the outer mold body.

[0021] Further, a second buffer pad is arranged on the upper surface of the lower buffer plate.

[0022] Further, a contraction groove corresponding to the buffer plate is arranged in the outer mold body, and the buffer plate is slidably arranged in the contraction groove;

[0023] A spring is arranged in the contraction groove, and the two ends of the spring are respectively connected with the inner wall of the contraction groove and the buffer plate;

[0024] A limiting groove is formed in the shrinkage groove, and a limiting block is connected to the buffer plate. The limiting block is slidably disposed in the limiting groove.

[0025] By adopting the above technical solution, this utility model has the following beneficial effects:

[0026] 1. By setting up structures such as inlet, outlet and cooling channel, coolant is injected from the inlet during the operation of the outer mold body. The coolant flows in the annular cooling channel and then flows out from the outlet. The process of injecting coolant is repeated to cool the entire outer mold body from the inside. The built-in annular cooling channel can make the cooling more uniform.

[0027] 2. Through the setting of buffer plates and springs, the clamping mechanism will abut against the buffer plate when it moves towards the steel pipe, so as to avoid the clamping mechanism directly impacting the outer mold body and causing damage to the outer mold body. The spring setting allows the buffer plate to extend a certain distance when it is not squeezed. When the steel pipe is completely pulled out, it provides a certain support for the last steel pipe and prevents the steel pipe from bending due to being too long. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the assembly structure of the outer mold body and the outer mold base of this utility model;

[0029] Figure 2 This is a schematic diagram of the overall structure of the outer mold body of this utility model;

[0030] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 For the present utility model Figure 2 Enlarged view of section B in the middle.

[0032] In the diagram: 1. Outer mold base; 2. Outer mold body;

[0033] 3. Shaping cavity; 31. Transition zone; 32. Sizing zone;

[0034] 4. Connecting block; 5. Step;

[0035] 6. Cooling components; 61. Liquid inlet; 62. Liquid outlet; 63. Cooling channel;

[0036] 7. First buffer assembly; 71. Buffer plate; 72. Spring; 73. First buffer pad; 74. Second buffer pad; 75. Limiting block; 76. Limiting groove. Detailed Implementation

[0037] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawings, the utility model is further explained in detail.

[0038] Embodiment one

[0039] As Figures 1-2 , Figure 4 As shown in a kind of steel pipe cold-drawing machine outer mould mechanism, comprising:

[0040] Outer mould body 2;

[0041] Modeling cavity 3 is set in outer mould body 2, and modeling cavity 3 is suitable for extruding shaping to the steel pipe passing;

[0042] Transition zone 31 and sizing zone 32 are provided in modeling cavity 3, and steel pipe enters modeling cavity 3 first through transition zone 31 and then through sizing zone 32;

[0043] Cooling assembly 6, cooling assembly 6 includes inlet 61, cooling channel 63 and outlet 62;

[0044] Cooling channel 63 is located in outer mould body 2, and cooling channel 63 is communicated with inlet 61 and outlet 62, and outlet 62 and inlet 61 are both set on outer mould body 2 and communicated with outside;

[0045] Cooling channel 63 is annularly arranged in outer mould body 2, and cooling channel 63 is not communicated with modeling cavity 3.

[0046] As Figures 1-2 As shown in the outer mould mechanism further includes outer mould seat 1, and outer mould seat 1 is connected with outer mould body 2, and outer mould seat 1 is suitable for supporting outer mould body 2;

[0047] Butt block 4 is provided on the outer circumferential surface of outer mould body 2, and step 5 is set in outer mould seat 1, and butt block 4 is fitted on step 5;

[0048] The axial side of outer mould body 2 is outlet end face, and the axial other side is inlet end face;

[0049] After step 5 is connected with butt block 4, the outlet end face of outer mould body 2 is flush with the corresponding end face of outer mould seat 1;

[0050] The width of sizing zone 32 in the axial direction of outer mould body 2 is 6.0mm-6.5mm;

[0051] The width of transition zone 31 in the axial direction of outer mould body 2 is 10mm-11mm.

[0052] The working principle of the embodiment is as follows:

[0053] The outer mold body 2 needs to be connected with the outer mold base 1 in use, the outer mold base 1 supports the outer mold body 2 after connection, the steel pipe to be shaped is inserted into the molding cavity 3 from the inlet of the outer mold body 2 after the outer mold base 1 is fixed, it needs to be explained that the large opening end of the molding cavity 3 is the inlet, the other end is the outlet, the end of the steel pipe with the flat head extends to the outlet of the molding cavity 3, the clamping mechanism is arranged at the outlet of the outer mold body 2, the whole steel pipe is driven to move to the outlet of the outer mold body 2 after the flat end is clamped, and the cold drawing effect is realized;

[0054] The transition zone 31 and the sizing zone 32 are arranged in the molding cavity 3, the steel pipe moves in the molding cavity 3 under the tension of the clamping mechanism, is extruded by the taper inside the molding cavity 3 in the moving process, and changes the shape, finally extends to the outside of the outer mold body 2 through the transition zone 31 and the sizing zone 32, and the whole cold drawing process is completed, the transition zone 31 is used for guiding the steel pipe to pass through the sizing zone 32 stably, reducing mechanical impact and friction of the steel pipe when entering the outer mold body 2, and the main function of the sizing zone 32 is to ensure that the outer diameter size of the steel pipe after cold drawing meets the design requirement;

[0055] In the embodiment, the width of the transition zone 31 needs to be controlled to 10mm to 11mm, the width of the sizing zone 32 needs to be controlled to 6.0mm to 6.5mm, the outer transverse crack defect is solved by changing the parameters of the existing outer mold body 2, and the shaped steel pipe after cold drawing can reduce the probability of occurrence of the outer transverse crack under the parameters;

[0056] In addition, high heat is generated in the whole drawing process, the high heat is not treated, and the quality of the steel pipe or the service life of the outer mold body 2 is affected, therefore, the liquid inlet 61, the cooling channel 63 and the liquid outlet 62 are arranged on the outer mold body 2, the liquid inlet 61 can be used for injecting cooling liquid, the cooling liquid enters the cooling channel 63, the cooling channel 63 is arranged in the inside of the outer mold body 2 and is annular, the cooling liquid can uniformly cool the inside of the whole outer mold body 2 after entering the annular cooling channel 63, the cooling liquid finally flows out from the liquid outlet 62, the cooling liquid flowing out from the liquid outlet 62 can be treated through a circulating pump and a heat exchanger and the like, the circulation of the cooling liquid is realized, the treated cooling liquid enters the cooling channel 63 through the liquid inlet 61 again, and the outer mold body 2 is cooled, the cooling channel 63 cools the outer mold body 2 and also cools the steel pipe in the outer mold body 2, it needs to be explained that the size of the cooling channel 63 needs to be determined according to the size of the actual outer mold body 2, and the cooling channel 63 needs to be arranged to ensure that the molding cavity 3 in the outer mold body 2 can exert sufficient force on the steel pipe, so that the steel pipe is shaped and the outer mold body 2 is not deformed.

[0057] Example 2

[0058] like Figure 3 As shown, this embodiment further includes the following structure based on embodiment one: two symmetrically arranged first buffer components 7 are provided on the exit end face of the outer mold body 2. The first buffer component 7 includes a buffer plate 71 and a first buffer pad 73.

[0059] Two buffer plates 71 are located on the upper and lower sides of the outlet end face of the outer mold body 2, respectively;

[0060] The first buffer pad 73 is disposed on the outer end face of the buffer plate 71 on the axial direction of the outer mold body 2.

[0061] like Figure 3 As shown, a second buffer pad 74 is provided on the upper surface of the buffer plate 71 located below.

[0062] like Figure 3 As shown, a shrinkage groove corresponding to the buffer plate 71 is provided inside the outer mold body 2, and the buffer plate 71 is slidably disposed in the shrinkage groove;

[0063] A spring 72 is installed inside the shrinkage groove, and the two ends of the spring 72 are connected to the inner wall of the shrinkage groove and the buffer plate 71, respectively.

[0064] A limiting groove 76 is provided in the shrinkage groove, and a limiting block 75 is connected to the buffer plate 71. The limiting block 75 is slidably disposed in the limiting groove 76.

[0065] The working principle of this embodiment is as follows:

[0066] In the entire drawing process, the initial step includes an external clamping mechanism clamping the flat end of the steel pipe and then moving the entire steel pipe. Before the clamping mechanism clamps the flat end, it needs to be moved to the flat end. During this process, the clamping mechanism often directly impacts the exit section of the outer mold body 2 due to insufficient movement accuracy. Over time, this can lead to damage to the outer mold body 2. Therefore, a buffer plate 71 is provided on the outer mold body 2. When the clamping mechanism moves towards the outer mold body 2, it will first contact the first buffer pad 73 on the buffer plate 71. The first buffer pad 73 prevents the clamping mechanism from directly impacting the outer mold body 2 and plays a protective role. The external clamping mechanism is not shown in the attached figure. The clamping mechanism is existing technology, and its working principle will not be described in detail here.

[0067] Meanwhile, the second buffer pad 74 is arranged on the buffer plate 71, when the clamping mechanism drives the whole steel pipe to pass through the outer mold body 2, because the clamping mechanism only clamps the flat head end of the steel pipe, the length of the whole steel pipe is longer, after passing through the outer mold body 2, the tail of the steel pipe is not supported and directly inclines downward, so that the steel pipe is bent or inclined and hits other places and is damaged, therefore, the second buffer pad 74 is arranged to support the tail of the steel pipe, after the whole steel pipe passes through the outer mold body 2, the tail falls on the second buffer pad 74, it should be noted that the first buffer pad 73 and the second buffer pad 74 can be made of rubber;

[0068] In addition, the buffer plate 71 is arranged in the inner part of the outer mold body 2 through the spring 72, when not being extruded by the clamping mechanism, most of the buffer plate 71 extends to the outer part of the outer mold body 2, the supporting area of the tail of the steel pipe is increased, when the clamping mechanism moves to the outer mold body 2, the first buffer pad 73 and the buffer plate 71 are extruded, after the buffer plate 71 extrudes the spring 72, most of the buffer plate 71 is arranged in the inner part of the outer mold body 2, it should be noted that because the space of the buffer plate 71 is limited in the inner part of the outer mold body 2, even if being extruded, the buffer plate 71 will not completely extend into the inner part of the outer mold body 2, but a part of the buffer plate 71 is arranged to block the clamping mechanism from directly impacting the outer mold body 2, meanwhile, the buffer plate 71 drives the limiting block 75 to move in the limiting groove 76 in the process of being contracted, through the arrangement of the limiting groove 76, the buffer plate 71 will not completely extend to be separated from the outer mold body 2 when not being extruded, so that the supporting effect of the tail of the steel pipe can be ensured.

[0069] The above specific embodiments are used to further explain the technical problems, technical solutions and beneficial effects solved by the utility model, it should be understood that the above description is only the specific embodiments of the utility model and is not used to limit the utility model, any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An external mold mechanism for a steel pipe cold drawing machine, characterized in that, The utility model relates to a steel pipe shaping device, including: An outer die body (2) is provided; A shaping cavity (3) is formed in the outer die body (2), and the shaping cavity (3) is suitable for extruding and shaping a steel pipe passing through; A transition zone (31) and a sizing zone (32) are arranged in the shaping cavity (3), and the steel pipe passes through the transition zone (31) and then the sizing zone (32) after entering the shaping cavity (3); A cooling assembly (6) is arranged, and the cooling assembly (6) includes a liquid inlet (61), a cooling channel (63) and a liquid outlet (62); The cooling channel (63) is arranged in the outer die body (2), the cooling channel (63) is communicated with the liquid inlet (61) and the liquid outlet (62), and the liquid outlet (62) and the liquid inlet (61) are both arranged on the outer die body (2) and communicated with the outside; The cooling channel (63) is arranged in a ring shape in the outer die body (2), and the cooling channel (63) is not communicated with the shaping cavity (3).

2. The outer die mechanism for a steel pipe cold-drawing machine according to claim 1, characterized by The outer die mechanism further includes an outer die seat (1), the outer die seat (1) is connected with the outer die body (2), and the outer die seat (1) is suitable for supporting the outer die body (2); A butt joint block (4) is arranged on the outer periphery of the outer die body (2), a step (5) is formed in the outer die seat (1), and the butt joint block (4) is matched with the step (5); One side of the outer die body (2) in the axial direction is an outlet end face, and the other side in the axial direction is an inlet end face; After the step (5) is connected with the butt joint block (4), the outlet end face of the outer die body (2) is flush with the corresponding end face of the outer die seat (1).

3. The outer die mechanism for a steel pipe cold-drawing machine according to claim 1, characterized by The width of the sizing zone (32) in the axial direction of the outer die body (2) is 6.0mm-6.5mm.

4. The outer die mechanism for a steel pipe cold-drawing machine according to claim 1 or 3, characterized in that, The width of the transition zone (31) in the axial direction of the outer die body (2) is 10mm-11mm.

5. The outer die mechanism for a steel pipe cold-drawing machine according to claim 2, characterized by Two first buffer assemblies (7) are arranged on the outlet end face of the outer die body (2) in a symmetrical manner, the first buffer assembly (7) includes a buffer plate (71) and a first buffer pad (73); The two buffer plates (71) are respectively arranged on the upper and lower sides of the outlet end face of the outer die body (2); The first buffer pad (73) is arranged on the outer end face of the buffer plate (71) in the axial direction of the outer die body (2).

6. The outer die mechanism for a steel pipe cold-drawing machine according to claim 5, wherein A second buffer pad (74) is arranged on the upper plane of the lower buffer plate (71).

7. The outer die mechanism for a steel pipe cold-drawing machine according to claim 6, characterized by A contraction groove corresponding to the buffer plate (71) is formed in the outer die body (2), and the buffer plate (71) is slidably arranged in the contraction groove; A spring (72) is arranged in the contraction groove, and the two ends of the spring (72) are respectively connected with the inner wall of the contraction groove and the buffer plate (71); A limiting groove (76) is formed in the contraction groove, a limiting block (75) is connected to the buffer plate (71), and the limiting block (75) is slidably arranged in the limiting groove (76).

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