Precise hot upsetting die for large nut

Abstract

The utility model relates to the technical field of nut processing, in particular to a large nut precision hot upsetting die which comprises a first-order die and a second-order die, the first-order die is provided with a hexagonal lower die, a hexagonal upper stamping die is inserted above the hexagonal lower die, a lower die hexagonal die is inserted below the hexagonal lower die, and a lower die upper stamping die is inserted below the lower die hexagonal die. A die cavity used for forming a nut is arranged between the hexagonal lower die and the lower die hexagonal die, the second-order die is provided with a lower die sleeve, a blanking lower die is arranged at the bottom of the lower die sleeve, a punching hexagonal lower die is installed on the blanking lower die, a punching bottom die used for positioning is installed between the blanking lower die and the punching hexagonal lower die, and a demolding plate is arranged on the punching hexagonal lower die. Due to the fact that the inner corners and the outer chamfers are arranged on the hexagonal upper punching die and the hexagonal lower punching die, a bar is evenly stressed in the hot upsetting process, the inner chamfers and the outer chamfers of the hexagonal nuts can be directly formed, the procedure of machining the inner chamfers and the outer chamfers of the nuts is omitted, production efficiency is greatly improved, and the utilization rate of raw materials is greatly increased.

Description

Technical Field

[0001] The utility model relates to the technical field of nut processing, in particular to a precision hot upsetting die for large nuts. Background Art

[0002] In modern industrial production, hexagonal nuts above M64 are widely used in various types of engineering equipment as high-strength nuts. The traditional production process is blanking-forming-internal and external chamfering-shot blasting-tapping. The internal and external chamfering process is usually performed by turning to shape and beautify the nuts. This process is difficult to process, resulting in low production efficiency and low material utilization. In order to solve this problem, a new type of precision hot upsetting die for hexagonal nuts above M64 is developed through the present invention. Utility Model Content

[0003] The utility model provides a precision hot upsetting die for large nuts, so as to solve the technical problem that the existing internal and external chamfering process of nuts above M64 is usually performed by turning the nuts, which is difficult, resulting in low production efficiency and low material utilization.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] The utility model provides a precision hot upsetting die for large nuts, comprising a first-order die and a second-order die, wherein the first-order die is provided with a hexagonal lower die, a hexagonal upper punch die is inserted above the hexagonal lower die, a lower die hexagonal die is inserted below the hexagonal lower die, a die cavity for forming nuts is provided between the hexagonal lower die and the lower die hexagonal die, the second-order die is provided with a lower die sleeve, a blanking lower die is provided at the bottom of the lower die sleeve, a punching hexagonal lower die is installed on the blanking lower die, a punching bottom die for positioning is installed between the blanking lower die and the punching hexagonal lower die, a stripping plate is provided on the punching hexagonal lower die, and a punching needle is inserted in the middle of the stripping plate.

[0006] Furthermore, the hexagonal upper punch and the lower punch are both provided with inner angles and outer chamfers, and the outer chamfers are 24° to 25°, and the inner angles are 90° to 91°.

[0007] Furthermore, a plurality of exhaust holes are provided in the hexagonal upper punch die and the hexagonal lower die die.

[0008] Furthermore, the hexagonal lower die is provided with a demoulding taper of 0.2° to 0.5°.

[0009] Furthermore, the through hole in the middle of the hexagonal punching lower die is circular, and its diameter is larger than the size of the opposite side of the nut.

[0010] Furthermore, the chamfer angle and chamfer height of the punching bottom die are smaller than those of the lower die hexagonal die.

[0011] Beneficial effects of the utility model:

[0012] 1. The utility model designs inner and outer chamfers on the hexagonal upper punch die and the lower die hexagonal die, so that the nuts above M64 produced have inner and outer chamfers, eliminating the chamfering process after manual nut forming, achieving beautiful appearance of nut forming, clear inner and outer chamfers, greatly improving production efficiency, product quality, and material utilization.

[0013] 2. The utility model designs a demoulding taper on the hexagonal lower die, which ensures the verticality of the nut on the one hand and makes it easier to demould the hexagonal nut on the other hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of a molding die in the utility model;

[0015] Figure 2 It is a cross-sectional view of the second-order punching die in the utility model;

[0016] Figure 3 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0017] Description of reference numerals:

[0018] 1. Hexagonal lower die; 2. Hexagonal upper punch; 3. Hexagonal lower die; 4. Hexagonal lower die for punching; 5. Punching bottom die; 6. Punching needle; 7. Blanking lower die; 8. Stripper plate; 9. Lower die sleeve; 10. Nut; 11. Die cavity; 12. Inner angle; 13. Outer chamfer. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0025] As described in the background art, the process of internal and external chamfering of nuts above M64 is usually performed by turning the nuts, which is difficult to process and results in low production efficiency and low material utilization.

[0026] To solve the above problems, refer to Figure 1 to Figure 3 The embodiment of the present application provides a large nut precision hot upsetting die, including a first-order die and a second-order die. The first-order die is provided with a hexagonal lower die 1, a hexagonal upper punch 2 is inserted above the hexagonal lower die 1, and a lower die hexagonal die 3 is inserted below the hexagonal lower die 1. A die cavity 11 for forming a nut 10 is provided between the hexagonal lower die 1 and the lower die hexagonal die 3. The bar material is placed in the hexagonal lower die 1. During the hot upsetting process, the hexagonal upper punch 2 and the lower die hexagonal die 3 form the bar material into a nut 10 in the die cavity 11. The formed nut 10 has internal and external chamfers, which eliminates the process of processing the internal and external chamfers of the nut 10, thereby greatly improving the production efficiency and the utilization rate of raw materials. At this time, a cap core is left in the hole of the nut 10.

[0027] The second-order mold is provided with a lower mold sleeve 9, and a blanking lower mold 7 is provided at the bottom of the lower mold sleeve 9. A punching hexagonal lower mold 4 is installed on the blanking lower mold 7. A punching bottom mold 5 for positioning is installed between the blanking lower mold 7 and the punching hexagonal lower mold 4. The nut 10 is placed in the middle of the punching hexagonal lower mold 4 and abuts against the punching bottom mold 5. A stripping plate 8 is provided on the punching hexagonal lower mold 4, and a punching needle 6 is inserted in the middle of the stripping plate 8. The nut 10 is positioned by the punching bottom mold 5, and the punch moves up and down to drive the punching needle 6 to punch out the cap core in the hole of the nut 10. The stripping plate 8 is used to demold the nut 10.

[0028] like Figure 3 As shown, the hexagonal upper punch 2 and the lower hexagonal die 3 are both provided with an inner angle 12 and an outer chamfer 13, and the inner angle 12 is 90° to 91°, and the outer chamfer 13 is 24° to 25°, so that the inner and outer chamfers of the nut 10 are more rounded, ensuring the fullness of the hexagonal part of the nut 10 and the utilization rate of the material.

[0029] In the utility model, three exhaust holes with a depth of 60 mm and a diameter of 0.9 mm are arranged in the upper and lower surfaces of the die cavity 11 formed by the hexagonal upper punch die 2 and the lower hexagonal die 3 for exhaust, so as to make the stamping process more stable and improve the production efficiency of nuts.

[0030] In this embodiment, the hexagonal lower die 1 is provided with a demoulding taper of 0.2° to 0.5°, which is more conducive to demoulding.

[0031] In this embodiment, the through hole in the middle of the hexagonal punching lower die 4 is circular, and its diameter is 0.2 larger than the opposite side of the nut 10. On the one hand, it is to prevent the nut 10 from being deformed when the product is punched, and on the other hand, it is convenient for two-step demoulding.

[0032] In this embodiment, the chamfer angle of the punching bottom die 5 is 1° smaller than that of the lower die hexagonal die 3, and the chamfer height is 1.3 mm smaller than that of the lower die hexagonal die 3, so that the nut 10 will not move during the punching process, and the concentricity of the nut 10 is more stable.

[0033] The use principle of this utility model is as follows:

[0034] After the bar is heated to the specified temperature by medium frequency, it enters the hexagonal lower die 1 after being pressed. Through the up and down movement of the punch, the hexagonal upper punch die 2 and the lower die hexagonal die 3 are evenly stressed during the hot upsetting process, and the bar is formed into a nut 10 in the die cavity 11. After demoulding, the nut 10 is transferred to the second sequence, and the nut 10 is placed in the middle of the punching hexagonal lower die 4 and abuts against the punching bottom die 5. The nut 10 is positioned by the punching bottom die 5, and the punch moves up and down to make the punching needle 6 punch out the cap core in the hole of the nut 10. The cap core passes through the blanking lower die 7 and enters the pre-prepared waste trough. Finally, the nut 10 is demoulded by the demoulding plate 8 to complete the forming of the nut 10.

[0035] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. In addition, the technical solutions between the various implementations of the utility model can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A precision hot upsetting die for large nuts, characterized by: The invention comprises a first-order mold and a second-order mold, wherein the first-order mold is provided with a hexagonal lower mold (1), a hexagonal upper punching die (2) is inserted above the hexagonal lower mold (1), a lower mold hexagonal mold (3) is inserted below the hexagonal lower mold (1), a mold cavity (11) for forming a nut (10) is provided between the hexagonal lower mold (1) and the lower mold hexagonal mold (3), the second-order mold is provided with a lower mold sleeve (9), a blanking lower mold (7) is provided at the bottom of the lower mold sleeve (9), a punching hexagonal lower mold (4) is installed on the blanking lower mold (7), a punching bottom mold (5) for positioning is installed between the blanking lower mold (7) and the punching hexagonal lower mold (4), a stripping plate (8) is provided on the punching hexagonal lower mold (4), and a punching needle (6) is inserted in the middle of the stripping plate (8).

2. The large nut precision hot upsetting die according to claim 1, characterized in that: The hexagonal upper punch die (2) and the lower die hexagonal die (3) are both provided with an inner angle (12) and an outer chamfer (13), wherein the inner angle (12) is 90° to 91°, and the outer chamfer (13) is 24° to 25°.

3. The large nut precision hot upsetting die according to claim 2, characterized in that: A plurality of exhaust holes are arranged in the hexagonal upper punch die (2) and the lower hexagonal die (3).

4. The large nut precision hot upsetting die according to claim 1, characterized in that: The hexagonal lower die (1) is provided with a demoulding taper of 0.2° to 0.5°.

5. The large nut precision hot upsetting die according to claim 1, characterized in that: The through hole in the middle of the punching hexagonal lower die (4) is circular, and its diameter is larger than the opposite side of the nut (10).

6. The large nut precision hot upsetting die according to claim 1, characterized in that: The chamfer angle and chamfer height of the punching bottom die (5) are smaller than those of the lower die hexagonal die (3).

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