A forming die for a super large copper alloy screw-down nut blank for a rolling mill

Abstract

The utility model relates to mould technical field, and disclose a kind of forming mould of extra-large copper alloy screw-down nut blank for rolling mill, including lower die holder, the upper side of lower die holder movably is provided with upper die holder, the upper side of lower die holder is fixedly provided with lower die groove, the lower side of upper die holder is fixedly provided with upper die groove, the left and right sides of lower die holder inboard are fixedly provided with limit recess, the left and right sides of upper die holder upper side are fixedly provided with limit projection, the inboard of lower die groove and upper die groove are fixedly provided with wear layer, the lower left side of lower die holder is fixedly provided with water inlet pipe, the side of water inlet pipe is fixedly provided with water inlet, the other side of water inlet pipe is fixedly provided with S bend flow guide pipe.This forming mould of extra-large copper alloy screw-down nut blank for rolling mill, by the cooperation of limit recess and limit projection, combined with the buffering effect of elastic buffer sleeve, the positioning accuracy when mould is combined is greatly improved, and the size deviation of blank forming is reduced.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a forming mold for extra-large copper alloy press-down nut blanks used in rolling mills. Background Technology

[0002] In rolling mill equipment, extra-large copper alloy pressing nuts are key transmission components. The quality of their billet forming directly affects the accuracy of subsequent processing and the stability of equipment operation. Extra-large copper alloy pressing nut billets are large in size and heavy in weight, which places extremely high demands on the structural strength and stability of the forming mold. During the mold closing process, existing forming molds are prone to lateral misalignment between the upper and lower mold bases due to the lack of a precise positioning and guiding structure, which leads to deviations in the billet forming dimensions and may even cause damage to the mold cavity in severe cases.

[0003] Meanwhile, the mold cavity is in long-term contact with the high-temperature copper alloy billet, and is subjected to severe friction and thermal shock. The surface wear resistance of traditional mold cavities is insufficient, and problems such as wear and cracking are very easy to occur, which greatly shortens the service life of the mold. In addition, the cooling rate of extra-large billets is slow after forming, which prolongs the production cycle. Moreover, the billet is tightly attached to the mold cavity, making the demolding process difficult. Traditional manual prying or simple ejection methods are not only inefficient, but also easily cause scratches or deformation on the surface of the billet, increasing the difficulty and cost of subsequent processing. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The purpose of this invention is to provide a forming mold for extra-large copper alloy press-down nut blanks for rolling mills, so as to solve the problems of insufficient positioning accuracy, rapid mold wear, low cooling efficiency and difficulty in demolding mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a forming mold for extra-large copper alloy press-down nut blanks for rolling mills, comprising a lower mold base, characterized in that: an upper mold base is movably disposed above the lower mold base; a lower mold groove is fixedly disposed above the lower mold base; an upper mold groove is fixedly disposed below the upper mold base; limiting grooves are fixedly disposed on the left and right sides of the inner side of the lower mold base; limiting protrusions are fixedly disposed on the left and right sides of the upper side of the upper mold base; a wear-resistant layer is fixedly disposed on the inner side of the lower mold groove and the upper mold groove; a water inlet pipe is fixedly disposed on the lower left side of the lower mold base; and a water inlet is fixedly disposed on one side of the water inlet pipe.

[0008] Preferably, an S-bend guide pipe is fixedly installed on the other side of the water inlet pipe, and an outlet pipe is fixedly installed on the other side of the S-bend guide pipe. A movable plate is movably installed on the lower inner side of the lower mold base. The S-bend guide pipe can extend the flow path of cooling water in the mold, enhance the heat exchange effect, and improve the cooling efficiency.

[0009] Preferably, a demolding ejector pin is fixedly installed below the movable plate, the demolding ejector pin passes through the lower mold base, and an impact base plate is fixedly installed below the demolding ejector pin. By applying external force through the impact base plate, the demolding ejector pin and the movable plate can be driven to move upward, thereby realizing the rapid demolding of the blank.

[0010] Preferably, the wear-resistant layer is made of tungsten carbide coating material, and the surface roughness of the wear-resistant layer is no greater than 0.8μm. The wear-resistant layer is fixed to the inner wall of the lower mold groove and the upper mold groove by plasma spraying process. Tungsten carbide coating has extremely high hardness and wear resistance, and can effectively resist the erosion and wear of high temperature copper alloy. The plasma spraying process can ensure that the coating is firmly bonded to the inner wall of the mold groove and extend the service life of the mold.

[0011] Preferably, the outer side of the limiting protrusion is wrapped with an elastic buffer sleeve, the thickness of which is 3-5mm. The elastic buffer sleeve fits tightly against the inner wall of the limiting groove. The limiting protrusion and the limiting groove cooperate to achieve precise positioning. The elastic buffer sleeve can alleviate the impact force during mold closing, prevent the mold from being damaged by rigid collision, and further improve the positioning stability.

[0012] Preferably, the diameter of the S-bend guide pipe is 1.2-1.5 times that of the inlet pipe, the distance between the S-bend guide pipe and the inner wall of the lower mold base is not less than 5cm, and the bending angle of the S-bend guide pipe is 90°. The larger pipe diameter design reduces water flow resistance, and the reasonable installation spacing and bending angle ensure that the cooling water can fully exchange heat with the mold, thereby improving cooling uniformity.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The forming mold for the extra-large copper alloy pressing nut blank of this rolling mill, through the cooperation of the limiting groove and the limiting protrusion, combined with the buffering effect of the elastic buffer sleeve, greatly improves the positioning accuracy when the mold is closed and reduces the deviation of the blank forming size.

[0015] 2. The forming die for the extra-large copper alloy pressing nut blank of this rolling mill has a tungsten carbide coating wear-resistant layer on the inner side of the upper and lower die grooves. The high hardness and wear resistance of the coating effectively slows down the wear rate of the die cavity and significantly extends the service life of the die.

[0016] 3. The forming die for the extra-large copper alloy pressing nut blank of this rolling mill, through the design of the S-bend guide pipe, extends the flow path of cooling water in the die, improves cooling efficiency, shortens the cooling time after blank forming, and improves production efficiency.

[0017] 4. The forming mold for the extra-large copper alloy pressing nut blank of this rolling mill achieves rapid demolding of the extra-large blank through a demolding mechanism composed of a demolding ejector rod, an impact base plate, and a movable plate, avoiding damage to the blank caused by manual material handling and reducing labor intensity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0020] Figure 3 This is a schematic cross-sectional view of the present invention.

[0021] Figure 4 This is a three-dimensional structural diagram of the S-bend guide tube of this utility model.

[0022] In the diagram: 1. Lower mold base; 2. Upper mold base; 3. Lower mold groove; 4. Upper mold groove; 5. Limiting groove; 6. Limiting protrusion; 7. Wear-resistant layer; 8. Water inlet pipe; 9. Water inlet; 10. S-bend guide pipe; 11. Water outlet pipe; 12. Movable plate; 13. Demolding ejector pin; 14. Impact base plate; 15. Elastic buffer sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4This utility model provides a technical solution: a forming mold for extra-large copper alloy press-down nut blanks for rolling mills, comprising a lower mold base 1, characterized in that: an upper mold base 2 is movably arranged above the lower mold base 1, a lower mold groove 3 is fixedly arranged above the lower mold base 1, an upper mold groove 4 is fixedly arranged below the upper mold base 2, limiting grooves 5 are fixedly arranged on the left and right sides of the inner side of the lower mold base 1, limiting protrusions 6 are fixedly arranged on the left and right sides of the upper side of the upper mold base 2, a wear-resistant layer 7 is fixedly arranged on the inner side of the lower mold groove 3 and the upper mold groove 4, a water inlet pipe 8 is fixedly arranged on the lower left side of the lower mold base 1, and a water inlet 9 is fixedly arranged on one side of the water inlet pipe 8.

[0025] An S-bend guide pipe 10 is fixedly installed on the other side of the water inlet pipe 8, and an outlet pipe 11 is fixedly installed on the other side of the S-bend guide pipe 10. A movable plate 12 is movably installed on the lower inner side of the lower mold base 1. A demolding ejector rod 13 is fixedly installed below the movable plate 12. The demolding ejector rod 13 passes through the lower mold base 1, and an impact base plate 14 is fixedly installed below the demolding ejector rod 13.

[0026] The wear-resistant layer 7 is made of tungsten carbide coating material, and the surface roughness of the wear-resistant layer 7 is no greater than 0.8μm. The wear-resistant layer 7 is fixed to the inner wall of the lower mold groove 3 and the upper mold groove 4 by plasma spraying process. The outer side of the limiting protrusion 6 is wrapped with an elastic buffer sleeve 15, the thickness of the elastic buffer sleeve 15 is 3-5mm, and the elastic buffer sleeve 15 is tightly fitted with the inner wall of the limiting groove 5. The diameter of the S-bend guide pipe 10 is 1.2-1.5 times the diameter of the inlet pipe 8. The distance between the S-bend guide pipe 10 and the inner wall of the lower mold base 1 is no less than 5cm, and the bending angle of the S-bend guide pipe 10 is 90°.

[0027] Working Principle: During use, the lower mold groove 3 and upper mold groove 4 are preheated to ensure their temperatures meet process requirements, reducing thermal stress between the high-temperature copper alloy raw material and the mold. Then, the molten high-temperature copper alloy raw material is injected into the lower mold groove 3 at a uniform speed. A stable flow rate must be maintained during injection to avoid air bubbles or inclusions. Next, the drive device is activated to move the upper mold base 2 downwards. During this movement, the limiting protrusion 6 gradually embeds into the limiting groove 5, and the elastic buffer sleeve 15 makes close contact with the inner wall of the limiting groove 5. This not only achieves precise positioning but also buffers the impact force during mold closing, preventing damage to the mold due to rigid collisions. When the upper mold groove 4 and lower mold groove 3 are completely closed, a preset pressure is applied for extrusion molding. At this time, the tungsten carbide coating wear-resistant layer 7 on the inner side of the lower mold groove 3 and upper mold groove 4 plays a role in resisting the erosion of the high-temperature copper alloy. During the molding process, cooling water is continuously supplied to the water inlet pipe 8 through the water inlet 9. After entering the S-bend guide pipe 10, the cooling water has a longer flow path due to the curved structure of the guide pipe, and fully exchanges heat with the mold, absorbing the heat of the mold and the blank. Then it is discharged from the water outlet pipe 11, so that the blank can be cooled and shaped quickly. After cooling, the upper mold base 2 is driven to move upward and separate from the lower mold base 1. At this time, the hydraulic impact device applies an upward impact force to the impact base plate 14. The impact force is transmitted to the movable plate 12 through the demolding ejector rod 13. The movable plate 12 pushes the blank upward and pushes it out smoothly from the lower mold groove 3 to complete the demolding. Throughout the process, the wear-resistant layer 7 always protects the mold cavity from wear and extends the service life of the mold. All components work together to ensure the molding quality and production efficiency of the extra-large copper alloy press-down nut blank.

[0028] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A forming die for extra-large copper alloy press-down nut blanks for rolling mills, comprising a lower die base (1), characterized in that: An upper mold base (2) is movably disposed above the lower mold base (1). A lower mold groove (3) is fixedly disposed above the lower mold base (1). An upper mold groove (4) is fixedly disposed below the upper mold base (2). Limiting grooves (5) are fixedly disposed on the left and right sides of the inner side of the lower mold base (1). Limiting protrusions (6) are fixedly disposed on the left and right sides above the upper mold base (2). Wear-resistant layers (7) are fixedly disposed on the inner sides of the lower mold groove (3) and the upper mold groove (4). A water inlet pipe (8) is fixedly disposed on the lower left side of the lower mold base (1). A water inlet (9) is fixedly disposed on one side of the water inlet pipe (8).

2. The forming die for a large copper alloy press-down nut blank for a rolling mill according to claim 1, characterized in that: An S-bend guide pipe (10) is fixedly installed on the other side of the water inlet pipe (8), and an outlet pipe (11) is fixedly installed on the other side of the S-bend guide pipe (10). A movable plate (12) is movably installed on the lower inner side of the lower mold base (1).

3. The forming die for a large copper alloy press-down nut blank for a rolling mill according to claim 2, characterized in that: A demolding ejector pin (13) is fixedly installed below the movable plate (12), the demolding ejector pin (13) passes through the lower mold base (1), and an impact base plate (14) is fixedly installed below the demolding ejector pin (13).

4. The forming die for a large copper alloy press-down nut blank for a rolling mill according to claim 3, characterized in that: The wear-resistant layer (7) is made of tungsten carbide coating material. The surface roughness of the wear-resistant layer (7) is no greater than 0.8 μm. The wear-resistant layer (7) is fixed to the inner sidewall of the lower mold groove (3) and the upper mold groove (4) by plasma spraying process.

5. The forming die for a large copper alloy press-down nut blank for a rolling mill according to claim 4, characterized in that: The outer side of the limiting protrusion (6) is wrapped with an elastic buffer sleeve (15), the thickness of the elastic buffer sleeve (15) is 3-5mm, and the elastic buffer sleeve (15) is tightly fitted to the inner sidewall of the limiting groove (5).

6. The forming die for a large copper alloy press-down nut blank for a rolling mill according to claim 5, characterized in that: The diameter of the S-bend guide pipe (10) is 1.2-1.5 times that of the inlet pipe (8), the distance between the S-bend guide pipe (10) and the inner wall of the lower mold base (1) is not less than 5cm, and the bending angle of the S-bend guide pipe (10) is 90°.

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