Disc forge piece positioning tool and forging method

Abstract

The invention relates to the technical field of forging, in particular to a disc forge piece positioning tool and a forging method. Comprising an upper die and a lower die, at least one annular positioning groove is formed in the upper surface of the lower die, a positioning ring is arranged in the annular positioning groove in an interference fit mode, the upper end of the positioning ring is higher than the upper surface of the lower die, a positioning space is formed by the inner side face of the positioning ring and the upper surface of the lower die, and a mounting hole opposite to the positioning space is formed in the upper die. The mounting hole and the positioning ring are coaxially arranged, an ejector rod is arranged in the mounting hole, and the lower end of the ejector rod is lower than the lower surface of the upper die. According to the invention, the positioning ring is arranged on the lower die, the positioning ring is used for positioning the bar, the ejector rod on the upper die and the positioning ring are coaxially arranged, and when the bar is upset, the ejector rod is opposite to the center of the bar, so that a positioning hole can be formed in the center of the bar, and the processing is convenient and fast.

Description

Technical Field

[0001] The invention relates to the technical field of forging, in particular to a disc forging positioning tool and a forging method. Background Art

[0002] Currently, if Figure 1 As shown, the general production route for disc forgings is to select an initial bar, roughen the initial bar, form a blank after roughening, and then process a positioning hole in the center of the blank. After the positioning hole is processed, the positioning hole on the blank is matched with the positioning boss 15 of the second die 13, and finally the first die 14 is driven downward to form a forging. The process of processing the positioning hole after blank making is to enable the blank to be located in the center of the second die 13 during die forging, so as to achieve uniform forming of the forging during die forging.

[0003] In the process of machining positioning holes, it is necessary to find the center position of the blank, but the positioning of the center position is very difficult. If the axis of the positioning hole after machining is too far away from the axis of the center position of the blank, this will cause the blank to be unevenly distributed during the die forging process, which will cause some parts to have too much metal, resulting in too much flash, while some parts have too little metal, resulting in the inability to fill the entire cavity. In order to solve the problem of not being able to fill the cavity, the amount of material will be increased during the initial cutting, which will lead to material waste. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a disc forging positioning tool and a forging method capable of realizing the center positioning of a blank.

[0005] The technical solution adopted by the present invention to solve its technical problems is a disc forging positioning tool, including an upper die and a lower die, the upper surface of the lower die is provided with at least one annular positioning groove, a positioning ring is interference fit in the annular positioning groove, the upper end of the positioning ring is higher than the upper surface of the lower die, the inner side surface of the positioning ring and the upper surface of the lower die form a positioning space, the upper die is provided with a mounting hole opposite to the positioning space, the mounting hole is coaxially arranged with the positioning ring, a push rod is provided in the mounting hole, and the lower end of the push rod is lower than the lower surface of the upper die.

[0006] Furthermore, the number of the annular positioning grooves is 8, the 8 annular positioning grooves are coaxially arranged, and the inner diameters of the annular positioning grooves are 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, and 800 mm, respectively.

[0007] Furthermore, a guide mechanism is provided between the upper die and the lower die; the guide mechanism comprises a guide post provided on the lower surface of the upper die and a guide hole provided on the upper surface of the lower die, the guide hole being located outside the annular positioning groove and used in conjunction with the guide post.

[0008] Furthermore, the number of guide pillars and guide holes is two.

[0009] Furthermore, the inner side surface of the positioning ring is provided with a draft angle of 3° to 10°.

[0010] Furthermore, the ejector rod includes a rod portion and a head portion, wherein the head portion is located below the lower surface of the upper mold, and a side surface of the head portion is a truncated cone-shaped flow guide surface.

[0011] A forging method for a disc forging, using the disc forging positioning tool, comprises the following steps:

[0012] S1: Select the diameter of the annular locating groove according to the diameter of the bar, and install the locating ring in the annular locating groove by liquid nitrogen cold installation;

[0013] S2: The bar is placed in the positioning space formed by the inner side of the positioning ring and the upper surface of the lower die. The die forging machine drives the upper die to move downward to roughen the bar. At the same time, the ejector rod forms a positioning hole on the upper surface of the bar. After roughening, a blank is formed.

[0014] S3: The blank is turned 180° up and down and placed in the second die. The positioning hole of the blank fits with the positioning boss of the second die to achieve the positioning of the blank. The die forging machine drives the first die to move downward to finally form a forging.

[0015] Furthermore, the number of the annular positioning grooves is 8, the 8 annular positioning grooves are coaxially arranged, and the inner diameters of the annular positioning grooves are 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, and 800mm, respectively; in step S1, a positioning ring matching the diameter of the bar and a positioning ring having a diameter greater than the diameter of the bar are installed.

[0016] The beneficial effect of the present invention is that a positioning ring is arranged on the lower die to position the bar, and the push rod on the upper die is coaxially arranged with the positioning ring. When the bar is roughened, the push rod is opposite to the center of the bar, so that a positioning hole can be produced at the center of the bar, and the processing is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the process of the prior art;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention;

[0019] Figure 3 It is a schematic diagram of the lower die;

[0020] Figure 4 It is a schematic diagram of the lower die installing the bar stock;

[0021] Figure 5 It is a schematic diagram of the draft angle of the locating ring;

[0022] Figure 6 It is a flow chart of the present invention.

[0023] Figure markings: 1-lower mold; 2-upper mold; 3-annular positioning groove; 4-positioning ring; 5-positioning space; 6-mounting hole; 7-top rod; 8-guide column; 9-guide hole; 10-rod; 11-head; 12-guide surface; 13-second mold; 14-first mold; 15-positioning boss. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] like Figure 2-Figure 5 As shown, a disc forging positioning tool of the present invention comprises an upper die 2 and a lower die 1, the upper surface of the lower die 1 is provided with at least one annular positioning groove 3, a positioning ring 4 is interference fit in the annular positioning groove 3, the upper end of the positioning ring 4 is higher than the upper surface of the lower die 1, the inner side surface of the positioning ring 4 and the upper surface of the lower die 1 form a positioning space 5, the upper die 2 is provided with a mounting hole 6 opposite to the positioning space 5, the mounting hole 6 is coaxially arranged with the positioning ring 4, a push rod 7 is provided in the mounting hole 6, and the lower end of the push rod 7 is lower than the lower surface of the upper die 2.

[0026] Among them, the cross-section of the annular positioning groove 3 is semi-elliptical, the annular positioning groove 3 and the upper surface of the lower mold 1 are in an arc transition, the positioning ring 4 and the annular positioning groove 3 are interference fit, and the positioning ring 4 is installed in the annular positioning groove 3 by liquid nitrogen cold loading; the positioning ring 4 is located above the upper surface of the lower mold 1 and at the position matching the annular positioning groove 3, and the two parts are designed to be symmetrical up and down. The inner diameter of the annular positioning groove 3 is adapted to the inner diameter of the bar to be thickened, for example, the diameter of the bar is 100 mm, the inner diameter of the annular positioning groove 3 is 100 mm, and the inner diameter of the positioning ring 4 is also 100 mm; the inner side surface of the positioning ring 4 and the upper surface of the lower mold 1 form a positioning space 5. When in use, the bar is placed in the positioning space 5 to achieve the positioning of the bar; the lower surface of the upper mold 2 is provided with a mounting hole 6 opposite to the positioning space 5, and a push rod 7 is arranged in the mounting hole 6, so that the push rod 7 is coaxially arranged with the positioning ring 4. When the bar is installed in the positioning space 5, the push rod 7 is coaxial with the bar. When the upper mold 2 is driven downward, the push rod 7 can press out a positioning hole at the center of the bar.

[0027] In order to realize the positioning of bars of various specifications, further, the number of the annular positioning grooves 3 is 8, the 8 annular positioning grooves 3 are coaxially arranged, and the inner diameters of the annular positioning grooves 3 are 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, and 800mm respectively.

[0028] In order to prevent the upper die 2 from deflecting during the downward movement, further see Figure 2 and Figure 3 A guide mechanism is provided between the upper die 2 and the lower die 1; the guide mechanism comprises a guide post 8 provided on the lower surface of the upper die 2 and a guide hole 9 provided on the upper surface of the lower die 1, the guide hole 9 is located outside the annular positioning groove 3 and is used in conjunction with the guide post 8. The guide hole 9 is clearance-matched with the guide post 8, and the guide post 8 moves in the guide hole 9 during the downward movement of the upper die 2.

[0029] In order to better guide the upper die 2, see Figure 3 Further, the guide pillars 8 and the guide holes 9 are both provided in numbers of two.

[0030] In order to facilitate the removal of the formed blank from the positioning space 5, see Figure 4 Furthermore, the inner side surface of the positioning ring 4 is provided with a draft angle of 3° to 10°.

[0031] In order to facilitate the flow of metal when the upper surface of the bar contacts the push rod 7, further, see Figure 1 The ejector rod 7 includes a rod portion 10 and a head portion 11 . The head portion 11 is located below the lower surface of the upper mold 2 . The side surface of the head portion 11 is a truncated cone-shaped flow guide surface 12 .

[0032] A forging method for a disc forging, using a disc forging positioning tool as described above, see Figure 2-Figure 6 , including the following steps,

[0033] S1: Select the diameter of the annular positioning groove 3 according to the diameter of the bar material, and install the positioning ring 4 in the annular positioning groove 3 by liquid nitrogen cooling;

[0034] S2: The bar is placed in the positioning space 5 formed by the inner side of the positioning ring 4 and the upper surface of the lower die 1, and the die forging machine drives the upper die 2 to move downward to roughen the bar. At the same time, the push rod 7 forms a positioning hole on the upper surface of the bar. After roughening, a blank is formed;

[0035] S3: The blank is turned 180° up and down and placed in the second die 13. The positioning hole of the blank fits with the positioning boss 15 of the second die 13 to achieve the positioning of the blank. The die forging machine drives the first die 14 to move downward to finally form a forging.

[0036] Furthermore, the number of the annular positioning grooves 3 is 8, and the 8 annular positioning grooves 3 are coaxially arranged, and the inner diameters of the annular positioning grooves 3 are 100mm, 200mm, 300mm, 400mm, 500mm, 600mm, 700mm, and 800mm respectively; in step S1, the positioning ring 4 matching the diameter of the bar and the positioning ring 4 with a diameter greater than the diameter of the bar are installed. For example, when the diameter of the bar is 100mm, all the positioning rings 4 are installed, and when the diameter of the bar is 300mm, the positioning rings 4 with inner diameters of 300mm, 400mm, 500mm, 600mm, 700mm, and 800mm are installed. In this way, after the bar is rough-formed into a blank, an annular groove will be formed on the surface of the blank under the action of the positioning ring 4, and the surface deformation of the disc forging can be appropriately increased after die forging, and the quality of the disc forging is higher.

[0037] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A disc forging positioning tool, comprising an upper die (2) and a lower die (1), characterized in that: The upper surface of the lower die (1) is provided with at least one annular positioning groove (3), a positioning ring (4) is interference-fitted in the annular positioning groove (3), the upper end of the positioning ring (4) is higher than the upper surface of the lower die (1), the inner side surface of the positioning ring (4) and the upper surface of the lower die (1) form a positioning space (5), the upper die (2) is provided with a mounting hole (6) opposite to the positioning space (5), the mounting hole (6) is coaxially arranged with the positioning ring (4), a push rod (7) is provided in the mounting hole (6), and the lower end of the push rod (7) is lower than the lower surface of the upper die (2).

2. A disc forging positioning tool as claimed in claim 1, characterized in that: The number of the annular positioning grooves (3) is 8, the 8 annular positioning grooves (3) are coaxially arranged, and the inner diameters of the annular positioning grooves (3) are 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, and 800 mm, respectively.

3. A disc forging positioning tool as claimed in claim 1, characterized in that: A guide mechanism is provided between the upper die (2) and the lower die (1); the guide mechanism comprises a guide post (8) provided on the lower surface of the upper die (2) and a guide hole (9) provided on the upper surface of the lower die (1); the guide hole (9) is located outside the annular positioning groove (3) and is used in conjunction with the guide post (8).

4. A disc forging positioning tool as claimed in claim 3, characterized in that: The guide pillars (8) and guide holes (9) are both provided in numbers of two.

5. A disc forging positioning tool as claimed in claim 1, characterized in that: The inner side surface of the positioning ring (4) is provided with a draft angle of 3° to 10°.

6. A disc forging positioning tool as claimed in claim 1, characterized in that: The ejector rod (7) comprises a rod portion (10) and a head portion (11); the head portion (11) is located below the lower surface of the upper mold (2); and the side surface of the head portion (11) is a truncated cone-shaped flow guide surface (12).

7. A method for forging a disc forging, using a disc forging positioning tool as claimed in any one of claims 1 to 6, characterized in that: The following steps are included: S1: selecting the diameter of the annular positioning groove (3) according to the diameter of the bar material, and installing the positioning ring (4) in the annular positioning groove (3) by liquid nitrogen cooling; S2: The bar is placed in a positioning space (5) formed by the inner side of the positioning ring (4) and the upper surface of the lower die (1), and the die forging machine drives the upper die (2) to move downward to roughen the bar. At the same time, the push rod (7) forms a positioning hole on the upper surface of the bar. After the roughening is completed, a blank is formed; S3: The blank is rotated 180 degrees up and down, and the blank is placed in the second die (13). The positioning hole of the blank fits with the positioning boss (15) of the second die (13) to achieve the positioning of the blank. The die forging machine drives the first die (14) to move downward, and finally a forging is formed.

8. A method for forging a disc forging according to claim 7, characterized in that: The number of the annular positioning grooves (3) is 8, the 8 annular positioning grooves (3) are coaxially arranged, and the inner diameters of the annular positioning grooves (3) are 100 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, and 800 mm, respectively; in step S1, a positioning ring (4) matching the diameter of the bar and a positioning ring (4) having a diameter greater than the diameter of the bar are installed.

Images