Small diameter ring part rolling forming process and small diameter ring part

Abstract

The present invention discloses a process for rolling and forming small-diameter ring parts, comprising the steps of: S1, heating the blank; S2, preforming; S3, final punching; S4, rolling and forming; wherein, in step S2, the forming die used comprises an upper forming die, a forming ring, and an upper core rod for pre-punching, the upper core rod and the forming ring are coaxially arranged, and the upper core rod is inserted into the center hole of the forming ring. The process for rolling and forming small-diameter ring parts of the present invention uses a dedicated preforming die such as an upper forming die, a forming ring, and an upper core rod, which can improve the rolling and forming quality of small-diameter ring parts. The present invention also provides a small-diameter ring part, which is made using the small-diameter ring part rolling and forming process.

Description

Technical Field

[0001] The invention belongs to the technical field of ring-shaped part rolling and forming, and particularly relates to a small-diameter ring-shaped part rolling and forming process and the small-diameter ring-shaped part. Background Art

[0002] Ring parts have many specifications and a wide range of uses. They are widely used in chemical industry, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, sanitation, plumbing, fire protection, electricity, aerospace, shipbuilding and other basic engineering projects, and the market demand is huge.

[0003] The conventional ring rolling process is: upsetting → indentation → flattening → punching → rolling. Small-diameter rings (outer diameter ≤ 600mm) are characterized by minimal expansion and low deformation. Conventional preforming processes produce blanks that fail to meet these deformation requirements. After rolling, the inner and outer corners are not fully filled, failing to meet dimensional requirements. This results in poor stability and a low yield rate.

[0004] Chinese patent application number 201410684264.3 discloses a combination die for forging blanks of high-speed gear rings for motor vehicles, comprising an upper die, a lower die, a centering core shaft, and a cover die. The upper die is provided with a first through hole, and an upper forming groove coaxial with the first through hole is provided on the lower end face of the upper die; a second through hole is provided on the lower die, and a lower forming groove coaxial with the second through hole is provided on the upper end face of the lower die, and a positioning groove for positioning the centering core shaft is also provided in the lower forming groove, and the positioning groove is coaxial with the second through hole; the centering core shaft is coaxially arranged into a whole from top to bottom by a first frustum section, a second cylindrical section, and a third inverted frustum section; the cover die is a ring-shaped part, and the inner contour of the cover die is coaxially arranged by a first frustum surface and a second frustum surface from top to bottom.

[0005] It is desirable to provide an improved process for roll forming small diameter rings, particularly with regard to improving the quality of roll forming of small diameter rings. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a small-diameter ring roll forming process, the purpose of which is to improve the small-diameter ring roll forming quality.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a small diameter ring part rolling forming process, comprising the steps of:

[0008] S1, billet heating;

[0009] S2, preforming;

[0010] S3, final impact;

[0011] S4, rolling forming;

[0012] In step S2, the forming mold used includes an upper forming mold, a forming ring and an upper core rod for pre-punching. The upper core rod and the forming ring are coaxially arranged, and the upper core rod is inserted into the center hole of the forming ring.

[0013] The molding ring is located below the upper molding die. The upper molding die is provided with a first molding surface. The molding ring is provided with a second molding surface. The second molding surface is a conical surface. The first molding surface is a plane perpendicular to the axis of the second molding surface.

[0014] The forming die further comprises an upper looper, which is located between the upper core rod and the upper forming die.

[0015] The upper core rod includes a connecting portion and a punching portion connected to each other. The punching portion is located below the connecting portion. The punching portion and the forming ring are coaxially arranged and the punching portion is inserted into the center hole of the forming ring.

[0016] The punching portion is a conical structure.

[0017] The step S2 comprises:

[0018] S201, placing the heated blank on the first workbench of a press;

[0019] S202, a press presses the blank to form an indented blank;

[0020] S203: After the blank is demoulded, the blank is moved to the second workbench of the press.

[0021] In the step S3, the blank is punched on the second workbench of the press to form a center hole penetrating the blank.

[0022] In step S4, the billet that has completed the billet making process is fed into the rolling mill by a robot, and the mandrel drives the billet to move toward the main roller of the rolling mill. The billet is rolled under the action of the rotation of the main roller, the radial movement of the mandrel and the axial movement of the upper tapered roller, and the billet is continuously plastically deformed until the rolling process is completed.

[0023] The present invention also provides a small-diameter ring part, which is made by adopting the small-diameter ring part rolling forming process.

[0024] The outer diameter of the small-diameter annular member is ≤600 mm.

[0025] The small diameter ring part rolling forming process of the present invention uses a special upper forming die, a forming ring and an upper core rod and other preforming dies, which can improve the rolling forming quality of the small diameter ring part, has strong stability and high product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] This manual includes the following drawings, which show the following contents:

[0027] Figure 1 It is a partial cross-sectional view of the forming die;

[0028] Figure 2 is a cross-sectional view of the forming ring;

[0029] Figure 3 is a cross-sectional view of the upper forming die;

[0030] Figure 4 is a cross-sectional view of the upper core rod;

[0031] Figure 5 It is a cross-sectional view of the upper loop;

[0032] Figure 6 It is a structural diagram of a blank making blank type;

[0033] Figure 7 It is a structural diagram of the finished blank;

[0034] Figure 8 is a cross-sectional view of a finished blank of the present invention;

[0035] Figure 9 It is a cross-sectional view of an existing finished blank;

[0036] Marked in the figure are: 1, upper forming die; 2, forming ring; 3, upper core rod; 301, connecting part; 302, punching part; 4, blank; 5, upper looper. DETAILED DESCRIPTION

[0037] The following is a further detailed description of the specific implementation methods of the present invention through the description of embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0038] It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0039] like Figures 1 to 5 As shown, the present invention provides a small diameter ring part rolling forming process, comprising the following steps:

[0040] S1, billet heating;

[0041] S2, preforming;

[0042] S3, final impact;

[0043] S4. Rolling forming.

[0044] Specifically, small-diameter ring parts are circular ring structures with an outer diameter of ≤600mm. The main difficulty in eliminating rolling defects of small-diameter ring parts lies in the blank shape. In the present invention, the press uses a special mold to make the blank, improves the degree of metal deformation, and reasonably pre-distributes the metal to obtain the ideal blank shape, which has the advantages of strong stability and high pass rate.

[0045] like Figures 1 to 5 As shown, in the above step S2, the forming mold used includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper forming die 1, a forming ring 2, and an upper core rod 3 for pre-punching. The upper core rod 3 is coaxially arranged with the upper forming die 1 and the forming ring 2, and the upper core rod 3 is inserted into the center hole of the forming ring 2. The forming ring 2 is located below the upper forming die 1. The upper forming die 1 is provided with a first forming surface, and the forming ring 2 is provided with a second forming surface. The second forming surface is a conical surface. The first forming surface is a circular annular plane perpendicular to the axis of the second forming surface. The first forming surface is located above the second forming surface. The first forming surface contacts the top surface of the blank. The second forming surface is used to form the outer cylindrical surface of the blank.

[0046] The blank is a metal part. In the above step S2, during the preforming process of the blank, the metal is reasonably preformed and distributed on the press to optimize the blank shape and meet the basic conditions required for its deformation during rolling; then, by adjusting the rolling parameters, it can run stably on the rolling mill to achieve the required shape and size, thereby achieving the purpose of rolling and forming small-diameter ring parts.

[0047] like Figure 1 and Figure 3 As shown, the upper forming die 1 is a circular ring structure. The upper forming die 1 is used to assemble the forming ring 2, upper core rod 3, upper looper 5 and other auxiliary components required for blank making, and also has the function of pressing down the blank. The forming ring 2 is used to limit the free lateral flow of metal during the preforming process. At the same time, under the action of the high pressure of the upper forming die 1, the outer corners of the blank are well filled, the blank shape satisfies the flow of metal during rolling better, and meets the basic conditions of metal pre-distribution required for it to enter the die hole of the rolling mill and deform during rolling. Because this blank making method cannot use a pre-punch, the upper core rod 3 replaces the conventional pre-punch to make indentations, which is convenient for final punching.

[0048] like Figure 2 As shown, in this embodiment, the taper of the second molding surface is 4 degrees.

[0049] The upper core rod 3 is used to punch a hole in the center of the blank. Figure 1 and Figure 4As shown, the upper core rod 3 includes a connecting portion 301 and a punching portion 302, which are connected to each other. The punching portion 302 is located below the connecting portion 301. The punching portion 302 is coaxial with the forming ring 2 and is inserted into the center hole of the forming ring 2. The punching portion 302 has a conical structure and is located below the connecting portion 301. The upper end of the punching portion 302 is fixedly connected to the lower end of the connecting portion 301. The punching portion 302 is used to punch a hole in the center of the blank. The outer conical surface of the punching portion 302 has a taper of 4 degrees, and the outer conical surface of the punching portion 302 and the bottom surface of the punching portion 302 are connected by an arc transition. The fillet radius between the outer conical surface of the punching portion 302 and the bottom surface of the punching portion 302 is 30 mm.

[0050] like Figure 1 and Figure 5 As shown, the forming mold also includes an upper looper 5, which is located between the upper core rod 3 and the upper forming mold 1. The upper looper 5 is a circular ring structure. The upper looper 5 is coaxial with the upper core rod 3 and the upper forming mold 1. The bottom surface of the upper looper 5 is in contact with the top surface of the blank. The upper looper 5 can be used to push the material during demolding, so that the blank is separated from the forming mold, which facilitates the demolding of the blank.

[0051] The above step S2 includes:

[0052] S201, placing the heated blank on the first workbench of a press;

[0053] S202, a press presses the blank to form an indented blank;

[0054] S203: After the blank is demoulded, the blank is moved to the second workbench of the press.

[0055] In the above step S201, a special upper forming die 1, an upper core rod 3, an upper looper 5 and other special auxiliary dies are assembled on the first workbench of the press. The lower die assembly is a conventional flat template. The heated blank is placed on the first workbench, and then the blank is centered using a centering device.

[0056] In the above step S202, the blank is pressed down according to the set size to form an indentation blank, and a conical hole is initially formed at the center of the blank.

[0057] In the above step S203, after the blank is demoulded, it is picked up by the centering device and moved to the second workbench to wait for punching.

[0058] In the above step S3, the blank is punched on the second workbench of the press to form a penetrating center hole at the center of the blank, thereby completing the blank making process.

[0059] In the above step S4, the billet that has completed the billet making process is fed into the rolling mill by the robot, and the mandrel drives the billet to move toward the main roller of the rolling mill. The billet is rolled under the action of the rotation of the main roller, the radial movement of the mandrel and the axial movement of the upper tapered roller. The billet is continuously plastically deformed until the rolling process is completed.

[0060] The present invention also provides a small-diameter ring part, which is made by adopting the above-mentioned small-diameter ring part rolling forming process.

[0061] like Figure 8 As shown in FIG, it is a schematic diagram of the blank of a small diameter ring part made by the small diameter ring part rolling forming process of the present invention. It can be seen that the fullness at each intersection is good. Figure 9 The figure shows a schematic diagram of the blank shape of the conventional blank making mode, with a large arc at the intersection angle.

[0062] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. The rolling forming process of small diameter ring parts is characterized by: Including steps: S1, billet heating; S2, preforming; S3, final impact; S4, rolling forming; In step S2, the forming die used includes an upper forming die, a forming ring, and an upper core rod for pre-punching, the upper core rod and the forming ring are coaxially arranged, and the upper core rod is inserted into the center hole of the forming ring; The molding ring is located below the upper molding die, the upper molding die is provided with a first molding surface, the molding ring is provided with a second molding surface, the second molding surface is a conical surface, and the first molding surface is a plane perpendicular to the axis of the second molding surface; The upper forming die is used to assemble the forming ring and upper core rod required for blank making. The forming ring is used to limit the lateral free flow of metal during the preforming process. The upper forming die has the function of pressing down the blank height.

2. The rolling forming process for small diameter ring parts according to claim 1, characterized in that: The forming die further comprises an upper looper, which is located between the upper core rod and the upper forming die.

3. The rolling forming process for small diameter ring parts according to claim 1, characterized in that: The upper core rod includes a connecting portion and a punching portion connected to each other. The punching portion is located below the connecting portion. The punching portion and the forming ring are coaxially arranged and the punching portion is inserted into the center hole of the forming ring.

4. The rolling forming process for small diameter ring parts according to claim 3, characterized in that: The punching portion is a conical structure.

5. The rolling forming process for small diameter ring parts according to any one of claims 1 to 3, characterized in that: The step S2 comprises: S201, placing the heated blank on the first workbench of a press; S202, a press presses the blank to form an indented blank; S203: After the blank is demoulded, the blank is moved to the second workbench of the press.

6. The rolling forming process for small diameter ring parts according to claim 5, characterized in that: In the step S3, the blank is punched on the second workbench of the press to form a center hole penetrating the blank.

7. The small diameter ring part rolling forming process according to any one of claims 1 to 3, characterized in that: In step S4, the billet that has completed the billet making process is fed into the rolling mill by a robot, and the mandrel drives the billet to move toward the main roller of the rolling mill. The billet is rolled under the action of the rotation of the main roller, the radial movement of the mandrel and the axial movement of the upper tapered roller, and the billet is continuously plastically deformed until the rolling process is completed.

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