Closed hot forging forming die for bowl-shaped part

Abstract

The utility model discloses a bowl-shaped piece closed type hot forging forming die, which belongs to the technical field of forging forming and comprises an upper die assembly and a lower die assembly matched with the upper die assembly, the upper die assembly is provided with an upper die core and an upper die which can be inserted into the lower die assembly, the upper die core is arranged in the center of the upper die, and the lower die core is arranged in the center of the lower die. A spacing distance exists between the outer wall of the upper mold core and the upper mold, spacing distances exist between the parts, inserted into the lower mold assembly, of the upper mold core and the upper mold and the lower mold assembly, and the parts, arranged on the lower mold assembly, of the upper mold core and the upper mold can form a first space with the lower mold assembly. The problems of large flash, insufficient filling, low yield and the like during hot forging forming of the bowl-shaped part are solved, the manufacturing cost can be reduced, and the production efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of forging forming technology, and specifically relates to a bowl-shaped part closed hot forging forming die. BACKGROUND

[0002] Hot forging forming not only can reasonably utilize the plastic deformation of metal to obtain the shape of required product, but also can improve the microstructure of metal material and further improve the performance, and hot forging forming die is commonly used in the manufacture of automobile parts. The structure feature of the forging blank of the pulley part in the vehicle CVT gearbox is that the whole is bowl-shaped, the bowl edge wall thickness is relatively thin, and forming is difficult, and the conventional preparation method of the forging is to perform forging with the bowl mouth shape downward, and there are many problems, for example, large flash, easy ejection deformation, and insufficient filling. The prior art urgently needs a new hot forging forming die, on the one hand, the products produced by the conventional die have more die sticking, deformation and insufficient filling, and the yield is low, and on the other hand, the die sticking of the product needs to disassemble and assemble the die, and repeated disassembly and assembly of the die leads to low production efficiency.

[0003] Patent CN203227785U discloses a metal hot forging piece flashless die, the die is a closed section structure, and the metal hot forging piece forming process is completed in the closed die cavity, so that no flash is generated, and therefore the material utilization rate is greatly improved, and the precision and appearance of the forging are also improved.

[0004] Patent CN114226623A discloses a semi-closed forming die for a thin-walled cylindrical part, and an extrusion cylinder structure is formed at the top of the lower die, so that the flash of the blank in the concave die cavity can be effectively prevented, and the material utilization rate is improved, but the problem of insufficient filling may exist at the thin-walled part. SUMMARY

[0005] The utility model discloses a purpose in solving the problem such as large flash, insufficient filling and low yield when bowl-shaped part hot forging forming, and simultaneously reducing manufacturing cost, improving production efficiency.

[0006] To solve the above technical problems, the utility model discloses a kind of bowl-shaped part closed hot forging forming die:

[0007] A kind of bowl-shaped part closed hot forging forming die, including upper die assembly, the lower die assembly matched with upper die assembly, upper die assembly has the upper die core and upper die of being able to insert lower die assembly, wherein, upper die core is placed in the center of upper die, there is interval distance between the outer wall of upper die core and upper die, and there is interval distance between the part of upper die core and upper die inserted lower die assembly and lower die assembly, and upper die core and upper die are placed in lower die assembly part can form first space with lower die assembly.

[0008] The upper mold core is partially in a columnar body structure at the center of the upper mold, and the upper mold has a ring body arranged around the outside of the upper mold core.

[0009] The lower mold assembly has a first cavity accommodating the upper mold core and the upper mold, and the lower mold assembly comprises a lower mold having a through hole at both ends, one end of which is provided with a lower mold core sealing one end thereof, and a top rod arranged at the center of the lower mold core, wherein the inner wall of the lower mold, the lower mold core and the top rod form the first cavity.

[0010] The lower mold core is in a rotary body structure, the end of the lower mold core is arranged in the lower mold, and the end of the lower mold core has an annular inclined surface, and the annular inclined surface has an included angle with the axis of the top rod.

[0011] The center of the lower mold core is provided with an inner hole matched with the top rod, and the end of the top rod is arranged in the lower mold, wherein the horizontal height of the end of the top rod arranged in the lower mold is higher than the horizontal height of the lowest surface of the annular inclined surface of the lower mold core, the inner hole is in clearance fit with the top rod, and the height of the top rod is less than the lower mold.

[0012] Specifically, the upper mold core is provided with a first boss on the outside, the upper mold is provided with a first counterbore, and the first boss is installed in fit with the first counterbore.

[0013] Specifically, the upper mold is provided with a second boss on the outside, the upper end of the upper mold is fixed with an upper mold fixing plate, the outer side of the upper mold fixing plate is provided with a third boss, the third boss is provided with a second counterbore, and the second boss is installed in fit with the second counterbore.

[0014] Specifically, the lower mold core is provided with a fourth boss on the outside, the lower end surface of the lower mold is provided with a first step, and the inner hole of the lower mold is provided with a second step, and the second step is installed in fit with the fourth boss.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The conventional forging process of the bowl-shaped part is that the bowl opening shape faces downward, and the metal is filled by being extruded from top to bottom during forging. The utility model discloses a closed hot forging forming die for a bowl-shaped part, the forming direction of the part is changed from the original downward forming to upward forming, and the upper die and the lower die are interchanged in position, so that the bowl opening part with a relatively thin wall thickness is easily filled.

[0017] Since the height of the top rod is less than the lower mold, the blank after preforming is completely in the cavity, and cannot overflow out of the mold cavity too early, so that the problems of large flash, insufficient filling, low yield and the like are solved. In addition, since the deep cavity is located in the upper mold, the hot forging forming die does not have the problems of oxide skin and residue accumulation of the release agent.

[0018] The utility model discloses a closed hot forging forming die for a bowl-shaped part, when the bowl-shaped part is formed, a top-down forming mode is adopted, so that the yield and the production efficiency are improved, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0020] Figure 1 A schematic view before forming of a bowl-shaped part closed hot forging forming die is disclosed in the present application.

[0021] Figure 2 A schematic view after forming of a bowl-shaped part closed hot forging forming die is disclosed in the present application.

[0022] Figure 3 A partial enlarged view of Figure 2

[0023] The drawing description mark: 1-upper mold core; 2-upper mold; 3-upper mold fixed plate; 4-lower mold; 5-lower mold core; 6-ejector pin; 11-first boss; 21-first counterbore; 22-second boss; 31-second counterbore; 32-third boss; 41-first step; 42-second step; 51-fourth boss; 52-inner hole. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The concepts involved in the present application will be described below in combination with the drawings. It is pointed out here that the following descriptions of the concepts are only to make the content of the present application easier to understand, and do not represent the limitation of the protection scope of the present application; meanwhile, the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] Embodiment one

[0027] As Figure 1 ​As shown, a bowl-shaped part closed hot forging forming die comprises an upper die assembly, a lower die assembly matched with the upper die assembly, the upper die assembly has an upper die core 1 capable of being inserted into the lower die assembly and an upper die 2, the upper die core 1 is arranged at the center of the upper die 2, a spacing distance is formed between the outer wall of the upper die core 1 and the upper die 2, a spacing distance is formed between the upper die core 1 and the upper die 2 inserted into the part of the lower die assembly and the lower die assembly, and the upper die core 1 and the upper die 2 are arranged at the part of the lower die assembly capable of forming a first space with the lower die assembly.

[0028] Before forging, the metal material is arranged in the first space formed by the upper die assembly and the lower die assembly, the upper die core 1 and the upper die 2 of the upper die assembly are capable of moving up and down, the lower die assembly is fixed, and the deformed metal is in contact with the inner wall of the die during forging, and the die material generally has high thermal stability, strength and hardness, and good impact toughness, heat fatigue resistance and wear resistance.

[0029] Specifically, the upper die core 1 is arranged in a columnar body structure at the center of the upper die 2, and the upper die 2 has a ring body arranged around the outside of the upper die core 1.

[0030] The lower die assembly has a first cavity for accommodating the upper die core 1 and the upper die 2, and the lower die assembly comprises a lower die 4, the lower die 4 is provided with a lower die core 5 sealing one end of the lower die 4, a top rod 6 is arranged at the center of the lower die core 5, and the inner wall of the lower die 4, the lower die core 5 and the top rod 6 form the first cavity.

[0031] The top rod 6 is capable of moving up and down in the cavity to realize the ejection of the hot forging forming product. As a forging process above the recrystallization temperature of the metal, the hot forging shapes the molten metal by means of hammering, pressure or stamping, and in the embodiment, the metal in the first space is ejected by the top rod 6 in the lower die assembly after cooling, that is, the hot forging forming process is completed.

[0032] Specifically, the lower die core 5 is in a rotary body structure, the end of the lower die core 5 is arranged in the lower die 4, the end of the lower die core 5 has an annular inclined surface, and the annular inclined surface has an included angle with the axis of the top rod 6.

[0033] The utility model discloses a kind of bowl-shaped part closed hot forging forming die, and the conventional forging process of bowl-shaped part is bowl mouth shape downward, and metal is filled by being extruded from top to bottom during forging, and the forming direction of part is changed from original downward forming to upward forming in the utility model, and upper and lower dies are position interchanged, so that bowl mouth place of wall thickness thinner is easy to fill.

[0034] Example two

[0035] As Figure 2As shown, the lower mold core 5 is provided with an inner hole 52 assembled with the ejector rod 6, the end of the ejector rod 6 is placed inside the lower mold 4, the horizontal height of the end of the ejector rod 6 placed inside the lower mold 4 is higher than the horizontal height of the lowest surface of the annular inclined surface of the lower mold core 5, the inner hole 52 is in clearance fit with the ejector rod 6, and the height of the ejector rod 6 is less than the lower mold 4.

[0036] The bowl-shaped part closed hot forging forming die has the advantages that the height of the ejector rod 6 is less than the lower mold 4, the blank after preforming is placed in the lower mold cavity and is completely inside the cavity, and the blank cannot overflow outside the mold cavity too early, so that the problems of large flash, insufficient filling, low product yield and the like are solved.

[0037] Specifically, the lower mold core 5 is provided with a fourth boss 51, the lower end surface of the lower mold 4 is provided with a first step 41, and the inner hole of the lower mold 4 is provided with a second step 42, and the second step 42 is installed in cooperation with the fourth boss 51.

[0038] The upper mold core 1 is provided with a first boss 11, the upper mold 2 is provided with a first counterbore 21, and the first boss 11 is installed in cooperation with the first counterbore 21. The upper mold 2 is provided with a second boss 22, the upper end of the upper mold 2 is fixed with an upper mold fixed plate 3, the outer side of the upper mold fixed plate 3 is provided with a third boss 32, the third boss 32 is provided with a second counterbore 31, and the second boss 22 is installed in cooperation with the second counterbore 31.

[0039] The bowl-shaped part closed hot forging forming die has the advantages that the height of the ejector rod 6 is less than the lower mold 4, the blank after preforming is placed in the lower mold cavity and is completely inside the cavity, and the blank cannot overflow outside the mold cavity too early, so that the problems of large flash, insufficient filling, low product yield and the like are solved.

[0040] It should be noted that the terms used in the present application are only for describing specific embodiments, and are not intended to limit the scope of the present application. As shown in the specification of the present application, unless the context clearly indicates otherwise, "one", "a", "an" and / or "the" do not specifically refer to the singular, but also include the plural. The terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method or device. Without more limitations, the element defined by the statement "including one" does not exclude the presence of another identical element in the process, method or device including the element.

[0041] It also needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" and the like should be broadly understood, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0042] The above-described embodiments and / or implementations are only used to illustrate the preferred embodiments and / or implementations of the present application, and do not limit the embodiments of the present application in any form. Any person skilled in the art can make some changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the present application, but should be considered as the same technical or embodiment as the present application.

[0043] The principles and implementations of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiments of the present application. It should be pointed out that due to the limited nature of the language expression, there are objectively infinite specific structures. For ordinary skilled persons in the technical field, without departing from the principles of the present application, some improvements, refinements or changes can be made, and the above technical features can be combined in an appropriate way. These improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be considered as the protection scope of the present application.

Claims

1. A bowl closed hot-forging forming die comprising an upper die assembly, a lower die assembly cooperating with the upper die assembly, characterized in that: The upper die assembly has an upper die core (1) and an upper die (2) capable of being inserted into the lower die assembly, the upper die core (1) is placed in the center of the upper die (2), there is a spacing distance between the outer wall of the upper die core (1) and the upper die (2), and there is a spacing distance between the upper die core (1) and the upper die (2) inserted into the lower die assembly and the lower die assembly. The upper die core (1) and the upper die (2) are placed in the lower die assembly part and can form a first space with the lower die assembly.

2. A bowl-shaped part closed hot-forging forming die according to claim 1, characterized in that: The upper die core (1) is placed in the center of the upper die (2) and is a columnar body structure, and the upper die (2) has a ring body arranged around the outside of the upper die core (1).

3. A bowl-shaped part closed hot-forging forming die according to claim 1, characterized in that: The lower die assembly has a first cavity accommodating the upper die core (1) and the upper die (2), and the lower die assembly includes a lower die (4) with a through hole at both ends, a lower die core (5) arranged at one end of the lower die (4) to seal the end, a top rod (6) arranged at the center of the lower die core (5), and the inner wall of the lower die (4), the lower die core (5), and the top rod (6) form a first cavity.

4. A bowl-shaped part closed hot-forging forming die according to claim 3, characterized in that: The lower die core (5) is a rotary body structure, the end of the lower die core (5) is placed inside the lower die (4), and the end of the lower die core (5) has an annular inclined surface, and the annular inclined surface has an included angle with the axis of the top rod (6).

5. A bowl-shaped part closed hot-forging forming die according to claim 4, characterized in that: The lower die core (5) is provided with an inner hole (52) at the center for assembling the top rod (6), the end of the top rod (6) is placed inside the lower die (4), and the horizontal height of the end of the top rod (6) placed in the lower die (4) is higher than the horizontal height of the lowest surface of the annular inclined surface of the lower die core (5). The inner hole (52) and the top rod (6) are gap-fitted, and the height of the top rod (6) is less than the lower die (4).

6. A bowl-shaped part closed hot-forging forming die according to claim 1, characterized in that: The outside of the upper die core (1) is provided with a first boss (11), the upper die (2) is provided with a first counterbore (21), and the first boss (11) and the first counterbore (21) are fitted and installed.

7. A bowl-shaped part closed hot-forging forming die according to claim 1, characterized in that: The outside of the upper die (2) is provided with a second boss (22), the upper end of the upper die (2) is fixed with an upper die fixing plate (3), and the outside of the upper die fixing plate (3) is provided with a third boss (32).

8. A bowl-shaped part closed hot-forging forming die according to claim 7, characterized in that: The third boss (32) is provided with a second counterbore (31), and the second boss (22) and the second counterbore (31) are fitted and installed.

9. A bowl-shaped part closed hot-forging forming die according to claim 3, characterized in that: The outside of the lower die core (5) is provided with a fourth boss (51), the lower end surface of the lower die (4) is provided with a first step (41), and the inner hole of the lower die (4) is provided with a second step (42).

10. A bowl-shaped part closed hot-forging forming die according to claim 9, characterized in that: The second step (42) and the fourth boss (51) are fitted and installed.

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