Hot die forging die with long service life

Abstract

The utility model relates to the technical field of hot die forging dies, in particular to a hot die forging die with long service life, which comprises a bottom plate, a lower die seat is placed on the surface of the bottom plate, stand columns are fixed at the left end and the right end of the bottom plate through supporting seats, and a top frame is fixedly connected with the surface between the adjacent stand columns. A forging die air cylinder is fixed to the surface of the top frame, an upper die base is installed at the output end of the forging die air cylinder, and a processing layer is further arranged on the surface of the upper die base and the surface of the bottom plate and used for increasing the abrasion resistance degree of the lower die base and the upper die base in the working process. By utilizing the metal streamlines of the lower die seat and the upper die seat, the fracture phenomenon of the die is avoided, and the service life is prolonged; the wear-resistant layer is arranged to increase the wear resistance of the surface of the mold; and meanwhile, the lubricating layer is arranged, so that the lubricating effect is achieved, the forge piece is rapidly demolded, and the effect of rapidly cooling the surface of the mold can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hot die forging dies, in particular to a hot die forging die with a long service life. Background Art

[0002] Forging is a processing method that uses a forging machine to apply pressure to a metal blank to cause it to undergo plastic deformation in order to obtain forgings with certain mechanical properties, shapes and sizes. It is one of the two major components of forging (forging and stamping). Forging can eliminate defects such as cast porosity produced during the metal smelting process and optimize the microstructure. At the same time, because the complete metal flow lines are preserved, the mechanical properties of forgings are generally better than those of castings of the same material.

[0003] In addition to bearing a large impact load, the hot forging die is also subjected to large compressive stress, tensile stress and bending stress, as well as the strong friction generated by the flow of hot metal in the forging die cavity. The die surface is in close contact with the metal at a temperature of 1100-1200°C, so its surface will be heated to 300-400°C. The forging die is cooled with water or oil between two operations. The repeated heating and cooling of the die causes volume changes, which is very likely to cause fatigue cracks. Fatigue cracks, fractures, and wear are the main forms that affect the life of hot forging dies. Utility Model Content

[0004] The utility model aims to provide a hot die forging die with a long service life, so as to solve the problem in the above background technology that the existing hot forging die is very easy to produce fatigue cracks, thus affecting the service life.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hot die forging die with a long service life, comprising a base plate, a lower die seat is placed on the surface of the base plate, and the lower die seat is used for placing product parts; columns are fixed to the left and right ends of the base plate through a support seat, and a top frame is fixedly connected to the surface between adjacent columns, a forging die cylinder is fixed to the surface of the top frame, and an upper die seat is installed at the output end of the forging die cylinder, and the upper die seat cooperates with the lower die seat for stamping product parts; a treatment layer is also provided on the surface of the upper die seat and the base plate, and the treatment layer is used to increase the wear resistance of the lower die seat and the upper die seat when they are working.

[0006] Preferably, a mold cavity is opened on the surface of the lower mold base, and the mold cavity is used for stamping and forming product parts.

[0007] Preferably, metal flow lines are provided on the surfaces of the lower mold seat and the upper mold seat, and the metal flow lines are used to increase the service life of the lower mold seat and the upper mold seat.

[0008] Preferably, the treatment layer is composed of a wear-resistant layer and a lubricating layer, and the surfaces of the lower mold seat and the upper mold seat are provided with a wear-resistant layer, which is used to increase the wear resistance of the lower mold seat and the upper mold seat.

[0009] Preferably, a lubricating layer is also sprayed on the surface of the wear-resistant layer, and the lubricating layer is used to increase the lubrication degree of the lower die seat and the upper die seat to facilitate rapid demoulding of the forging.

[0010] Preferably, the wear-resistant layer has a thickness ranging from 0.15 mm to 0.20 mm.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the hot die forging die with a long service life avoids the occurrence of die breakage and increases the service life by setting metal streamlines and treatment layers and utilizing the metal streamlines of the lower die seat and the upper die seat; a nitriding process is performed on the lower die seat and the upper die seat to form a wear-resistant layer to increase the wear resistance of the die surface; at the same time, a graphite emulsion lubricant is used on the lower die seat and the upper die seat to form a lubricating layer, which is evenly sprayed in a spraying manner during the treatment, which not only plays a lubricating role to quickly demold the forging, but also plays a role in quickly cooling the die surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the structure of the lower mold base of the utility model;

[0014] Figure 3 It is a schematic diagram of the enlarged partial cross-section structure of the lower mold base of the utility model.

[0015] In the figure: 1, bottom plate; 11, column; 12, top frame; 13, forging die cylinder; 2, lower die seat; 21, die cavity; 3, upper die seat; 4, metal flow line; 5, treatment layer; 51, wear-resistant layer; 52, lubricating layer. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0017] The utility model provides a hot die forging die with a long service life. Figure 1 as well as Figure 2As shown, it includes a base plate 1, a lower mold seat 2 is placed on the surface of the base plate 1, and the lower mold seat 2 is used for placing product parts. A mold cavity 21 is opened on the surface of the lower mold seat 2, and the mold cavity 21 is used for stamping and forming product parts; columns 11 are fixed to the left and right ends of the base plate 1 through a support seat, and a top frame 12 is fixedly connected to the surface between adjacent columns 11, a forging die cylinder 13 is fixed to the surface of the top frame 12, and an upper mold seat 3 is installed on the output end of the forging die cylinder 13, and the upper mold seat 3 is used for stamping product parts in cooperation with the lower mold seat 2, and metal streamlines 4 are also opened on the surfaces of the lower mold seat 2 and the upper mold seat 3, and the metal streamlines 4 are used to increase the service life of the lower mold seat 2 and the upper mold seat 3.

[0018] During implementation, the lower die seat 2 and the upper die seat 3 are fully forged (alternately upsetting and stretching, at least 2-3 times) during production to eliminate the directionality of the rolled material structure and make its performance as uniform as possible. The metal flow lines 4 of the two die seats are perpendicular to the striking direction, and the fewer the number of metal flow lines 4 cut by the die cavity, the better. In the design, the metal flow lines 4 must not be parallel to the striking direction. If they are set in parallel, it is easy to cause the hot forging die to break, affecting the service life.

[0019] Furthermore, if Figure 2 as well as Figure 3 As shown, the surfaces of the upper die seat 3 and the bottom plate 1 are also provided with a treatment layer 5, which is used to increase the wear resistance of the lower die seat 2 and the upper die seat 3 during operation. The treatment layer 5 is composed of a wear-resistant layer 51 and a lubricating layer 52. The surfaces of the lower die seat 2 and the upper die seat 3 are provided with a wear-resistant layer 51, which is used to increase the wear resistance of the lower die seat 2 and the upper die seat 3. The surface of the wear-resistant layer 51 is also sprayed with a lubricating layer 52, which is used to increase the lubrication of the lower die seat 2 and the upper die seat 3 to facilitate rapid demolding of the forgings. The thickness of the wear-resistant layer 51 is in the range of 0.15 mm to 0.20 mm.

[0020] During implementation, the lower die seat 2 and the upper die seat 3 are subjected to a nitriding process to form a wear-resistant layer 51 to increase the wear resistance of the die surface and improve the life of the die. The thickness of the nitriding layer is 0.15 to 0.20 mm. At the same time, before nitriding, the die is ensured to have a low surface roughness value and a smooth die cavity surface to facilitate the rapid flow of metal and improve the life of the die. The lower die seat 2 and the upper die seat 3 are treated with a graphite emulsion lubricant to form a lubricating layer 52. During the treatment, the lubricating layer 52 is evenly sprayed in a spraying manner, which not only plays a lubricating role, allowing the forging to be quickly demolded, but also plays a role in quickly cooling the die surface. It does not cause the surface temperature of the die cavity 21 to be too high, which reduces the surface hardness and wear resistance, resulting in early wear and failure of the die.

[0021] Working principle: First, the lower die seat 2 and the upper die seat 3 are fully forged during production (alternate upsetting and stretching, at least 2 to 3 times) to eliminate the directionality of the rolled material structure and make its performance as uniform as possible. The metal flow lines 4 of the two die seats are perpendicular to the striking direction, and the fewer the number of metal flow lines 4 cut by the die cavity, the better. In the design, the metal flow lines 4 must not be parallel to the striking direction. If they are set in parallel, it is easy to cause the hot forging die to break, affecting the service life.

[0022] Secondly, the lower die seat 2 and the upper die seat 3 are first rough-machined and then heat-treated to ensure that the die groove has a higher hardness and a deeper hardness layer; the die is annealed after forging to eliminate forging stress, refine the grains, and make the structure uniform for easy cutting; then, the quenching temperature and quenching holding time should be reasonably set during quenching and tempering. Too high temperature, too long time, and too low tempering temperature will cause overheating or overburning of the die, resulting in insufficient toughness of the die and easy cracks on the working surface. On the contrary, although the toughness is improved, the strength, hardness, and wear resistance are reduced, making the die easily crushed or accelerated in wear; then, the cooling process is used to prevent the occurrence of temper brittleness. Oil cooling is generally used after tempering, and the oil is discharged at 100°C.

[0023] Afterwards, a nitriding process is performed on the lower mold base 2 and the upper mold base 3 to form a wear-resistant layer 51 to increase the wear resistance of the mold surface and improve the life of the mold. The thickness of the nitriding layer is 0.15 to 0.20 mm. At the same time, before nitriding, ensure that the mold has a low surface roughness value and a smooth cavity surface to facilitate the rapid flow of metal and improve the life of the mold.

[0024] Finally, the lower die seat 2 and the upper die seat 3 are treated with graphite emulsion lubricant to form a lubricating layer 52, which is evenly sprayed in a spraying manner, which not only plays a lubricating role, allowing the forging to be quickly demolded, but also plays a role in quickly cooling the die surface, so as not to make the surface temperature of the die cavity 21 too high, reduce the surface hardness, reduce the wear resistance, and cause early wear and failure of the die.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A hot forging die with a long service life, comprising a base plate (1), characterized in that: A lower die seat (2) is placed on the surface of the bottom plate (1), and the lower die seat (2) is used for placing product parts; columns (11) are fixed to both left and right ends of the bottom plate (1) through support seats, and a top frame (12) is fixedly connected to the surface between adjacent columns (11); a forging die cylinder (13) is fixed to the surface of the top frame (12), and an upper die seat (3) is installed at the output end of the forging die cylinder (13); the upper die seat (3) cooperates with the lower die seat (2) to stamp product parts; a treatment layer (5) is also provided on the surface of the upper die seat (3) and the bottom plate (1), and the treatment layer (5) is used to increase the wear resistance of the lower die seat (2) and the upper die seat (3) during operation.

2. A hot forging die with a long service life according to claim 1, characterized in that: A mold cavity (21) is provided on the surface of the lower mold base (2), and the mold cavity (21) is used for stamping and forming product parts.

3. A hot forging die with a long service life according to claim 1, characterized in that: The surfaces of the lower mold seat (2) and the upper mold seat (3) are also provided with metal flow lines (4), and the metal flow lines (4) are used to increase the service life of the lower mold seat (2) and the upper mold seat (3).

4. The hot forging die with long service life according to claim 1, characterized in that: The treatment layer (5) is composed of a wear-resistant layer (51) and a lubricating layer (52). The surfaces of the lower mold base (2) and the upper mold base (3) are provided with the wear-resistant layer (51). The wear-resistant layer (51) is used to increase the wear resistance of the lower mold base (2) and the upper mold base (3).

5. A hot forging die with a long service life according to claim 4, characterized in that: The surface of the wear-resistant layer (51) is also sprayed with a lubricating layer (52), and the lubricating layer (52) is used to increase the lubrication level of the lower die seat (2) and the upper die seat (3), so as to facilitate rapid demoulding of the forging.

6. The hot forging die with long service life according to claim 4, characterized in that: The thickness of the wear-resistant layer (51) ranges from 0.15 mm to 0.20 mm.

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