阅读说明：本技术 工程设备油压系统用连接螺母坯件的制造方法 (Method for manufacturing connecting nut blank for hydraulic system of engineering equipment ) 是由 张金清 詹朝晖 于 2021-08-23 设计创作，主要内容包括：本发明提供了一种工程设备油压系统用连接螺母坯件的制造方法,通过冷挤压六模制造,直接制得工程设备油压系统用连接螺母坯件,所述工程设备油压系统用连接螺母坯件的外形结构包括正六棱柱主体,在工程设备油压系统用连接螺母坯件的两端为与正六棱柱主体同中心线且与正六棱柱主体横截面的正六边形轮廓内切的圆柱端,所述工程设备油压系统用连接螺母坯件的中心孔为台阶孔。通过本发明方法,能够提高原料的利用率和质量并提高生产效率,并且,外观质量高、产品强度高。(The invention provides a method for manufacturing a connecting nut blank for an oil pressure system of engineering equipment, which is characterized in that the connecting nut blank for the oil pressure system of the engineering equipment is directly manufactured by a cold extrusion six-die, the appearance structure of the connecting nut blank for the oil pressure system of the engineering equipment comprises a regular hexagonal prism main body, two ends of the connecting nut blank for the oil pressure system of the engineering equipment are cylindrical ends which are concentric with the regular hexagonal prism main body and internally tangent to a regular hexagonal outline of the cross section of the regular hexagonal prism main body, and a central hole of the connecting nut blank for the oil pressure system of the engineering equipment is a stepped hole. The method can improve the utilization rate and quality of raw materials and the production efficiency, and has high appearance quality and high product strength.)

1. The manufacturing method of the connecting nut blank for the hydraulic system of the engineering equipment is characterized in that the appearance structure of the manufacturing method of the connecting nut for the hydraulic system of the engineering equipment comprises a regular hexagonal prism main body, two ends of the connecting nut blank for the hydraulic system of the engineering equipment are cylindrical ends which are concentric with the regular hexagonal prism main body and internally tangent to a regular hexagonal outline of the cross section of the regular hexagonal prism main body, a central hole of the connecting nut blank for the hydraulic system of the engineering equipment is a step hole, wherein the length of a large central hole section with a larger diameter extends from a first end of the connecting nut blank for the hydraulic system of the engineering equipment to be close to a second end, and the ratio of the length of a small central hole section with a smaller diameter to the length of the cylindrical end of the second end is 1.5-2.5: 1;

the manufacturing method comprises the following steps:

(1) feeding the disc material into a cold heading forming machine to be automatically sheared into single connecting nut blank raw material pieces for an oil pressure system of engineering equipment, wherein the diameter of the disc material is smaller than that of the cylindrical end, and the length of the raw material pieces is shorter than that of the regular hexagonal prism main body;

(2) the raw material piece is moved into a first die opening of a cold heading forming machine, the raw material piece is ejected into the first die by a punching tool at the front end of the first die, and a first central positioning hole is upset at the front end of a first molded finished product and a second central positioning hole and a fillet are upset at the rear end of the first molded finished product through cold heading in the first die;

(3) the first molded finished product is overturned and moved to a second mold opening, the first molded finished product is pushed into the second mold by a punching tool at the front end of the second mold, the front end of the second molded finished product is leveled under the condition of keeping a second central positioning hole through cold upsetting in the second mold, and the rear end of the second molded finished product is upset to form a round angle on the basis of keeping the first central positioning hole;

(4) the second molded finished product is overturned and moved to a third mold opening, the second molded finished product is ejected into a third mold by a punching tool at the front end of the third mold, a front hole with a large central hole section is formed at the front end of the third molded finished product through cold heading manufacturing in the third mold, the appearance of a main body of the third molded finished product is in a regular hexagonal prism shape consistent with the outer profile of a regular hexagonal prism main body of a connecting nut blank for an engineering equipment oil pressure system, a circle of conical surface is respectively formed at the outer sides of two ends of the third molded finished product, and the axial length of the conical surface positioned at the outer side of the rear end is larger than that of the conical surface positioned at the outer side of the front end;

(5) the third molded finished product is overturned and moved to a fourth mold opening, the third molded finished product is pushed into the fourth mold by a punching tool at the front end of the fourth mold, and is manufactured by cold upsetting in the fourth mold, a rear end binding rod of the fourth molded finished product is a cylindrical end of a first end of a connecting nut blank for an engineering equipment oil pressure system and deepens a front hole of a large central hole section, a front hole of a small central hole section is formed at the front end of the fourth molded finished product, the axial length of a conical surface of the front hole section is reduced, the diameter of the front hole of the small central hole section is consistent with that of the small central hole section, and the depth of the front hole section is shorter than that of the small central hole section;

(6) the fourth molded finished product is overturned and moved to a fifth mold opening, the fourth molded finished product is ejected into the fifth mold by a punching tool at the front end of the fifth mold, a large central hole section is upset out of the fifth molded finished product on the basis of a front hole of the large central hole section through cold upsetting in the fifth mold, the pier length of a regular hexagonal prism main body of the fifth molded finished product is the length of the regular hexagonal prism main body of the connecting nut blank for the hydraulic system of the engineering equipment, and a beam at the rear end of the fifth molded finished product is a cylindrical end of the second end of the connecting nut blank for the hydraulic system of the engineering equipment;

(7) and the fifth molded finished product is overturned and moved to a port of a sixth mold, the fifth molded finished product is pushed into the sixth mold by a punching tool at the front end of the sixth mold, and a small central hole section is formed by punching an iron core to manufacture a connecting nut blank for the oil pressure system of the engineering equipment.

Technical Field

The invention relates to the technical field of multi-station cold heading, in particular to a method for manufacturing a connecting nut blank for an engineering equipment oil pressure system.

Background

With the continuous progress of domestic and foreign industrial economy, the connecting device for the oil pressure system of engineering equipment such as a plastic machine, an excavator, an automobile and the like is rapidly developed in use and used as an important fastener in a hose joint, the appearance structure of a connecting nut blank for the oil pressure system of the engineering equipment comprises a regular hexagonal prism main body, two ends of the connecting nut blank for the oil pressure system of the engineering equipment are cylindrical ends which are concentric with the regular hexagonal prism main body and internally tangent to a regular hexagonal outline of the cross section of the regular hexagonal prism main body, a central hole of the connecting nut blank for the oil pressure system of the engineering equipment is a stepped hole, wherein the length of a large central hole section with a larger diameter extends from a first end of the connecting nut blank for the oil pressure system of the engineering equipment to be close to a second end, and the ratio of the length of a small central hole section with a smaller diameter to the length of the cylindrical end of the second end is 1.5-2.5: 1.

The connecting nut for the engineering equipment oil pressure system on the market is in a hexagonal nut shape by cold heading and then is machined, so that the machining speed is low, the cost is high, and the material waste is high.

Disclosure of Invention

The invention aims to provide a method for manufacturing a connecting nut blank for an oil pressure system of engineering equipment, which can directly manufacture the connecting nut for the oil pressure system of the engineering equipment by a multi-station cold extrusion method, improve the utilization rate and quality of raw materials and improve the production efficiency. Therefore, the invention adopts the following technical scheme:

the manufacturing method of the connecting nut blank for the hydraulic system of the engineering equipment is characterized in that the appearance structure of the manufacturing method of the connecting nut for the hydraulic system of the engineering equipment comprises a regular hexagonal prism main body, two ends of the connecting nut blank for the hydraulic system of the engineering equipment are cylindrical ends which are concentric with the regular hexagonal prism main body and internally tangent to a regular hexagonal outline of the cross section of the regular hexagonal prism main body, a central hole of the connecting nut blank for the hydraulic system of the engineering equipment is a step hole, wherein the length of a large central hole section with a larger diameter extends from a first end of the connecting nut blank for the hydraulic system of the engineering equipment to be close to a second end, and the ratio of the length of a small central hole section with a smaller diameter to the length of the cylindrical end of the second end is 1.5-2.5: 1;

the manufacturing method comprises the following steps:

(1) feeding the disc material into a cold heading forming machine to be automatically sheared into single connecting nut blank raw material pieces for an oil pressure system of engineering equipment, wherein the diameter of the disc material is smaller than that of the cylindrical end, and the length of the raw material pieces is shorter than that of the regular hexagonal prism main body;

(2) the raw material piece is moved into a first die opening of a cold heading forming machine, the raw material piece is ejected into the first die by a punching tool at the front end of the first die, and a first central positioning hole is upset at the front end of a first molded finished product and a second central positioning hole and a fillet are upset at the rear end of the first molded finished product through cold heading in the first die;

(3) the first molded finished product is overturned and moved to a second mold opening, the first molded finished product is pushed into the second mold by a punching tool at the front end of the second mold, the front end of the second molded finished product is leveled under the condition of keeping a second central positioning hole through cold upsetting in the second mold, and the rear end of the second molded finished product is upset to form a round angle on the basis of keeping the first central positioning hole;

(4) the second molded finished product is overturned and moved to a third mold opening, the second molded finished product is ejected into a third mold by a punching tool at the front end of the third mold, a front hole with a large central hole section is formed at the front end of the third molded finished product through cold heading manufacturing in the third mold, the appearance of a main body of the third molded finished product is in a regular hexagonal prism shape consistent with the outer profile of a regular hexagonal prism main body of a connecting nut blank for an engineering equipment oil pressure system, a circle of conical surface is respectively formed at the outer sides of two ends of the third molded finished product, and the axial length of the conical surface positioned at the outer side of the rear end is larger than that of the conical surface positioned at the outer side of the front end;

(5) the third molded finished product is overturned and moved to a fourth mold opening, the third molded finished product is pushed into the fourth mold by a punching tool at the front end of the fourth mold, and is manufactured by cold upsetting in the fourth mold, a rear end binding rod of the fourth molded finished product is a cylindrical end of a first end of a connecting nut blank for an engineering equipment oil pressure system and deepens a front hole of a large central hole section, a front hole of a small central hole section is formed at the front end of the fourth molded finished product, the axial length of a conical surface of the front hole section is reduced, the diameter of the front hole of the small central hole section is consistent with that of the small central hole section, and the depth of the front hole section is shorter than that of the small central hole section;

(6) the fourth molded finished product is overturned and moved to a fifth mold opening, the fourth molded finished product is ejected into the fifth mold by a punching tool at the front end of the fifth mold, a large central hole section is upset out of the fifth molded finished product on the basis of a front hole of the large central hole section through cold upsetting in the fifth mold, the pier length of a regular hexagonal prism main body of the fifth molded finished product is the length of the regular hexagonal prism main body of the connecting nut blank for the hydraulic system of the engineering equipment, and a beam at the rear end of the fifth molded finished product is a cylindrical end of the second end of the connecting nut blank for the hydraulic system of the engineering equipment;

(7) and the fifth molded finished product is overturned and moved to a port of a sixth mold, the fifth molded finished product is pushed into the sixth mold by a punching tool at the front end of the sixth mold, and a small central hole section is formed by punching an iron core to manufacture a connecting nut blank for the oil pressure system of the engineering equipment.

According to the invention, through reasonable station task arrangement, a full-automatic 6-station forming machine is adopted, and a product large and small round hole is formed at one time through reverse cold extrusion to manufacture the connecting nut for the oil pressure system of the engineering equipment; the cold extrusion causes the plastic deformation of the blank, changes the shape of the blank, and the streamline is not broken, thereby improving the mechanical property of the product and ensuring the quality of the product. Compared with the prior art, the invention omits the processes of lathing and repairing the outer diameters of two ends and flatting, and has stable size. The speed is improved by 2 to 4 times compared with the original process speed; the original processing mode needs 45g of material, but the material of the invention only needs 39g, which can save 13.4% of material and greatly reduce cost.

Drawings

FIG. 1 is a schematic process flow diagram of the manufacturing method of the present invention.

Fig. 2 is a bottom view of the fifth molded product.

Fig. 3 is a plan view of a sixth molded product, i.e., a blank joint nut for an oil hydraulic system of construction equipment manufactured according to the present invention.

Detailed Description

Reference is made to the accompanying drawings. The connecting nut blank 6 for the engineering equipment oil pressure system, which is manufactured by the invention, has an external shape structure comprising a regular hexagonal prism main body 60, cylindrical ends 61 and 62 which are concentric with the regular hexagonal prism main body 60 and internally tangent with a regular hexagonal outline of the cross section of the regular hexagonal prism main body 60 are arranged at two ends of the connecting nut blank 6 for the engineering equipment oil pressure system, a central hole of the connecting nut blank 6 for the engineering equipment oil pressure system is a step hole, wherein a large central hole section 63 with a larger diameter extends from a first end of the connecting nut blank 6 for the engineering equipment oil pressure system to be close to a second end, a small central hole section 64 with a smaller diameter is arranged at the second end, and the ratio of the length of the small central hole section to the length of the cylindrical end 62 at the second end is 1.5-2.5: 1.

The manufacturing method adopts the steps of firstly carrying out heat treatment and spheroidization on a disc material, then carrying out phosphate surface treatment, carrying out fine drawing and sizing treatment, and then carrying out cold extrusion manufacturing according to the following steps:

(1) and feeding the disc material into a cold heading forming machine to be automatically sheared into a single connecting nut blank raw material piece 100 for an oil pressure system of the engineering equipment, wherein the diameter of the disc material is smaller than that of the cylindrical end, and the length of the raw material piece 100 is shorter than that of the regular hexagonal prism main body 6.

(2) The raw material part 100 is transferred into a first die opening of a six-station cold heading forming machine, the raw material part 100 is ejected into the first die by a punching tool at the front end of the first die, and through cold heading manufacturing in the first die, the front end of a first molded finished product 1 is upset to form a first central positioning hole 11, and the rear end of the first molded finished product is upset to form a second central positioning hole 12 and a fillet 13.

(3) And the first molded finished product 1 is overturned and moved to a second mold opening, the first molded finished product 1 is pushed into the second mold by a punching tool at the front end of the second mold, the front end of the second molded finished product 2 is leveled under the condition of keeping a second central positioning hole 12 through cold upsetting in the second mold, and the rear end of the second molded finished product is upset to form a round angle 21 on the basis of keeping a first central positioning hole 11. For the cold heading of the first die and the second die, the cylinder diameters of the first molded product 1 and the second molded product 2 are kept constant, and are consistent with the diameter of the raw material piece 100, and only a natural slight difference is generated due to the die set at most.

(4) And the second molded finished product 2 is overturned and moved to a third die opening, the second molded finished product 2 is pushed into the third die by a punching tool at the front end of the third die, and the third molded finished product 3 is manufactured by cold upsetting in the third die, so that a front hole 31 of a large central hole section 63 is formed at the front end of the third molded finished product 3, the diameter of the front hole 31 is consistent with or slightly smaller than that of the large central hole section 63, the main body appearance of the third molded finished product 3 is a regular hexagonal prism shape 32 consistent with the cross section outline of a regular hexagonal prism main body 60 of the connecting nut blank 6 for the engineering equipment oil pressure system, and the outer sides of two ends of the third molded finished product 3 respectively form a circle of conical surfaces, wherein the conical surface 34 positioned on the outer side of the rear end is longer than the axial length of the conical surface 33 positioned on the outer side of the front end. The depth of the front aperture 31 substantially corresponds to the length of the cylindrical end 61 of the first end. The outer contour of the cross section of the regular hexagonal prism of the main body of the third molded product 3, the fourth molded product 4 and the fifth molded product 5 is kept unchanged, and only natural slight difference is generated due to a die set at most, and the outer contour of the cross section of the regular hexagonal prism of the connecting nut blank 6 for the oil pressure system of the engineering equipment is consistent with the outer contour of the cross section of the regular hexagonal prism of the connecting nut blank 6 for the oil pressure system of the engineering equipment.

(5) Turning the third molded finished product 3 to a fourth mold opening, ejecting the third molded finished product into the fourth mold by a punching tool at the front end of the fourth mold, and manufacturing by cold heading in the fourth mold, wherein a rear end binding rod of the fourth molded finished product 4 is a cylindrical end 61 for connecting a first end of a nut blank for an engineering equipment oil pressure system and deepens a front hole 31 of a large central hole section 63, and the deepened front hole is 41; meanwhile, the front hole 42 of the small central hole section 64 is formed at the front end of the molded product of size four, the axial length of the conical surface 34 is reduced, the number of the conical surface after the reduction is 43, the diameter of the front hole 42 of the small central hole section is consistent with that of the small central hole section 64, and the depth is shorter than that of the small central hole section 64.

(6) Turning and moving the fourth molded finished product 4 to a fifth mold opening, ejecting the fourth molded finished product 4 into the fifth mold by a punching tool at the front end of the fifth mold, manufacturing by cold upsetting in the fifth mold, upsetting the fifth molded finished product to form a large central hole section 63 on the basis of a front hole 41 of the large central hole section, lengthening a regular hexagonal prism main body pier of the fifth molded finished product 5 to the length of a regular hexagonal prism main body 60 of the connecting nut blank 6 for the hydraulic system of the engineering equipment, and using a binding rod at the rear end of the fifth molded finished product 5 as a cylindrical end 62 of the second end of the connecting nut blank 6 for the hydraulic system of the engineering equipment

(7) And turning over the fifth molded finished product 5 and moving the fifth molded finished product to a sixth mold opening, ejecting the fifth molded finished product 5 into the sixth mold by a punching tool at the front end of the sixth mold, and forming a small central hole section 64 through punching an iron core 101 to prepare the connecting nut blank 6 for the engineering equipment oil pressure system.

The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.