CN114558974B - Rolling and forging combined production method for gearbox intermediate gear shaft blank and forging die - Google Patents
Rolling and forging combined production method for gearbox intermediate gear shaft blank and forging die Download PDFInfo
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- CN114558974B CN114558974B CN202210124281.6A CN202210124281A CN114558974B CN 114558974 B CN114558974 B CN 114558974B CN 202210124281 A CN202210124281 A CN 202210124281A CN 114558974 B CN114558974 B CN 114558974B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 143
- 238000005242 forging Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
本发明公开了变速箱中间齿轮轴毛坯的轧锻结合生产方法及锻压模具，其特征在于：它由以下步骤制作完成：选取直径80mm的棒料；中频加热；通过楔横轧机轧制成变速箱中间齿轮轴轧制毛坯；通过压力机锻压成变速箱中间齿轮轴毛坯。本发明采用小直径棒料生产具有一个大直径圆盘的变速箱中间齿轮轴毛坯，使变速箱中间齿轮轴毛坯的大圆盘能发生应力变形，防止内部疏松，保证了产品质量，降低了生产原料的成本，提高了经济效益。
The present invention discloses a rolling and forging combined production method and a forging die for a gearbox intermediate gear shaft blank, which is characterized in that: it is manufactured by the following steps: selecting a bar with a diameter of 80 mm; medium frequency heating; rolling it into a gearbox intermediate gear shaft rolling blank by a wedge cross rolling mill; and forging it into a gearbox intermediate gear shaft blank by a press. The present invention uses a small diameter bar to produce a gearbox intermediate gear shaft blank with a large diameter disc, so that the large disc of the gearbox intermediate gear shaft blank can undergo stress deformation, prevent internal looseness, ensure product quality, reduce the cost of production raw materials, and improve economic benefits.
Description
Technical Field
The invention relates to an improvement of a production method of a gear box intermediate gear shaft blank, in particular to a rolling and forging combination production method of a gear box intermediate gear shaft blank and a forging die.
Background
The intermediate gear shaft of the gearbox is a transmission accessory of the automobile gearbox and is manufactured by finishing a blank of the intermediate gear shaft of the gearbox. The cross wedge rolling production method is generally adopted to manufacture a gear box intermediate gear shaft blank at present, the shape of the gear box intermediate gear shaft blank is shown in figure 1, the total length of the gear box intermediate gear shaft blank is 368mm, the gear box intermediate gear shaft blank consists of a conical shaft 1, a large disc 2, a connecting shaft 3, a small disc 4 and a step shaft 5, the step shaft 5 of the type consists of three shafts with different diameters, the diameter of the outer end of the conical shaft 1 is 30mm, the diameter of the inner end of the conical shaft 1 is 43.7mm, the length of the conical shaft is 157.5mm, the diameter of the large disc 2 is 115mm, the length of the large disc is 24.7mm, the diameter of the connecting shaft 3 is 33mm, the length of the connecting shaft is 72.1mm, the diameter of the small disc is 87.6mm, the length of the small disc is 23mm, the step shaft 5 is provided with three shafts with different diameters, the diameter of the outer end of the step shaft is 33.2mm, the length of the middle shaft is 40.2mm, the length of the middle shaft is 30.4mm, and the diameter of the shaft of the inner end is 3.2mm. The cross wedge rolling production method for the gear box intermediate gear shaft blank is characterized in that a bar with the diameter of 120mm is rolled and formed through a cross wedge rolling die once, and the cross wedge rolling production method for the gear box intermediate gear shaft blank by using the bar with the diameter of 120mm has the defects that in the rolling process, the conical shaft 1, the connecting shaft 3, the small disc 4 and the step shaft 5 are deformed, the inside is compact, the product quality requirement is met, and the diameter of the bar is the same as the diameter of the outer circle of the large disc 2, the large disc 2 is not deformed in the rolling process, the internal structure is loose, and the product quality requirement is not met.
Disclosure of Invention
The invention aims to provide a rolling and forging combined production method for producing a gear box intermediate gear shaft blank with a large-diameter disc by adopting a small-diameter bar stock, so that the large disc of the gear box intermediate gear shaft blank can be subjected to stress deformation, internal looseness is prevented, and the product quality is ensured.
In order to achieve the purpose, the technical scheme adopted by the invention is that the forging and combining production method of the blank of the intermediate gear shaft of the gearbox is characterized by comprising the following steps of:
firstly, selecting a bar stock, namely cutting the bar stock with the diameter of 80 mm;
Heating the cut bar by adopting an intermediate frequency heating furnace to enable the temperature of the cut bar to reach 1000-1100 ℃;
Thirdly, rolling the heated bar stock into a gear box intermediate gear shaft rolling blank through a cross wedge rolling machine, wherein the temperature of the gear box intermediate gear shaft rolling blank is 950-1000 ℃, and cross wedge rolling dies are symmetrically arranged on an upper roller and a lower roller of the cross wedge rolling machine; the wedge cross rolling die is provided with two symmetrical conical shaft rolling die cavities, two symmetrical rolling disc rolling die cavities, two symmetrical connecting shaft rolling die cavities, two symmetrical small disc rolling die cavities, two symmetrical step shaft rolling die cavities and a cutter, wherein the cutter is fixedly arranged at the tail end of the wedge cross rolling die and is positioned at the center position of the two step shaft rolling die cavities; rolling the bar stock into two transmission intermediate gear shaft rolling blanks at one time; the total length of the transmission intermediate gear shaft rolling blank is 413.3mm, the transmission intermediate gear shaft rolling blank consists of a conical shaft, a rolling disc, a connecting shaft, a small disc and a step shaft, wherein the diameter of the outer end of the conical shaft is 29mm, the diameter of the inner end of the conical shaft is 42.7mm, the length of the conical shaft is 157.5mm, the diameter of the rolling disc is 70mm, the length of the rolling disc is 70mm, the diameter of the connecting shaft is 33mm, the length of the connecting shaft is 72.1mm, the diameter of the small disc is 87.6mm, the length of the small disc is 23mm, the step shaft is provided with three shafts with different diameters, the diameter of the outer end of the small disc is 33.2mm, the length of the small disc is 57.1mm, the diameter of the middle shaft is 40.2mm, the length of the small disc is 30.4mm, the diameter of the inner end of the conical shaft is 50mm, the conical shaft rolling cavity is 3.2mm, the conical shaft rolling cavity is matched with the conical shaft of the transmission intermediate gear shaft rolling blank, the rolling disc cavity is matched with the rolling disc intermediate gear shaft rolling blank of the transmission intermediate gear shaft, the connecting shaft rolling cavity is matched with the small disc rolling blank, the small disc is the small disc, the middle shaft rolling cavity is matched with the middle shaft rolling shaft, the shaft is the shaft and the middle shaft is the shaft, the shaft is the shaft, the diameter is the shaft is the shaft is the, and the shaft is the, and the, and the shaft is and is, the step shaft rolling die cavity is matched with a step shaft of a transmission intermediate gear shaft rolling blank;
Forging and pressing the transmission intermediate gear shaft rolling blank into a transmission intermediate gear shaft blank through a press machine, wherein a forging and pressing die is arranged on the press machine and consists of an upper die and a lower die, and the lower die consists of a left die and a right die which are symmetrically arranged; the upper die is internally provided with a conical shaft forming cavity, a large disc upper forming cavity and a groove, central axes of the conical shaft forming cavity, the large disc upper forming cavity and the groove are overlapped, the groove is positioned at the bottom of the upper die, the upper end of the left die is provided with a left boss, the inner side wall of the left boss is provided with a large disc lower left forming cavity, the inner side wall of the left die is provided with a connecting shaft left side cavity, a small disc left side cavity and a step shaft left side cavity, the outer side wall of the left die is provided with a left die fixing hole which is fixedly connected with a press machine, the upper end of the right die is provided with a right boss, the inner side wall of the right boss is provided with a large disc lower right forming cavity, the inner side wall of the right die is provided with a connecting shaft right side cavity, the small disc right side cavity and the step shaft right side cavity, the outer side wall of the right die is provided with a right die fixing hole which is fixedly connected with the press machine, the left boss and the left boss are matched with the groove so as to be convenient to close after the left boss and the right boss are folded, the large disc lower than the large disc upper die cavity and the large disc lower die cavity can be inserted into the groove, and the large disc lower die cavity can be matched with the large disc upper die cavity and the large disc lower die cavity after the large disc lower die cavity is matched with the large disc cavity, and large disc lower die cavity is matched with the large disc lower cavity and large disc cavity and lower cavity, the rolling disc in the cavity is pressed into a large disc by a right forming cavity at the lower part of the large disc, and the left side cavity of the connecting shaft and the right side cavity of the connecting shaft are matched with the connecting shaft after being folded;
And (3) lifting an upper die by a press, separating a left die from a right die, putting the transmission intermediate gear shaft rolling blank manufactured in the step (III) between the left die and the right die, folding the left die and the right die, enabling a rolling disc to be positioned in a left forming cavity of the lower part of the large disc and a right forming cavity of the lower part of the large disc, enabling a connecting shaft to be positioned in the left forming cavity of the connecting shaft and the right forming cavity of the connecting shaft, enabling a small disc to be positioned in the left forming cavity of the small disc and the right forming cavity of the small disc, enabling a step shaft to be positioned in the left forming cavity of the step shaft and the right forming cavity of the step shaft, and then pressing the upper die into a conical shaft, and enabling the upper forming cavity of the large disc, the left forming cavity of the lower part of the large disc and the right forming cavity of the lower part of the large disc to press the rolling disc in the cavities into the large disc, thereby manufacturing the transmission intermediate gear shaft blank.
The forging die for the forging and combining production of the blank of the intermediate gear shaft of the gearbox comprises an upper die and a lower die, and is characterized in that the lower die consists of a left die and a right die which are symmetrically arranged; the upper die is internally provided with a conical shaft forming cavity, a large disc upper forming cavity and a groove, central axes of the conical shaft forming cavity, the large disc upper forming cavity and the groove are overlapped, and the groove is positioned at the bottom of the upper die; the upper end of the left die is provided with a left boss, the inner side wall of the left boss is provided with a left forming cavity at the lower part of the large disc, the inner side wall of the left die is provided with a left connecting shaft forming cavity, a left small disc forming cavity and a left step shaft forming cavity, and the outer side wall of the left die is provided with a left die fixing hole which is fixedly connected with the press; the upper end of the right die is provided with a right boss, the inner side wall of the right boss is provided with a large disc lower right forming cavity, the inner side wall of the right die is provided with a connecting shaft right forming cavity, a small disc right forming cavity and a step shaft right forming cavity, the outer side wall of the right die is provided with a right die fixing hole which is fixedly connected with a press machine, the conical shaft forming cavity is matched with a conical shaft of a transmission intermediate gear shaft blank, the left boss and the right boss are matched with a groove after being folded so as to be convenient to be inserted into the groove cavity after being folded, the large disc upper forming cavity is matched with the upper part of a large disc of the transmission intermediate gear shaft blank, the large disc lower left forming cavity and the large disc lower right forming cavity are matched with the lower part of the large disc of the transmission intermediate gear shaft blank after being folded, and the large disc upper forming cavity and the large disc lower forming cavity are combined with the large disc lower left forming cavity in the process of the die assembly of the upper die and the lower die, the rolling disc in the cavity is pressed into a large disc by a right forming cavity at the lower part of the large disc, the left side cavity of the connecting shaft and the right side cavity of the connecting shaft are matched with the connecting shaft of the intermediate gear shaft blank of the gearbox after being folded, the left side cavity of the small disc and the right side cavity of the small disc are matched with the small disc of the intermediate gear shaft blank of the gearbox after being folded, and the left side cavity of the step shaft and the right side cavity of the step shaft are matched with the step shaft of the intermediate gear shaft blank of the gearbox after being folded.
Compared with the current cross wedge rolling production method for rolling the intermediate gear shaft blank of the gearbox by using large-diameter bars, the method has the advantages that the small-diameter bars are adopted to produce the intermediate gear shaft blank of the gearbox with one large-diameter disc, so that the large disc of the intermediate gear shaft blank of the gearbox can be subjected to stress deformation, the internal loosening is prevented, the product quality is ensured, the cost of production raw materials is reduced, and the economic benefit is improved.
Drawings
FIG. 1 is a schematic front view of the structure of a blank for a gear box intermediate gear shaft of the present invention;
FIG. 2 is a schematic view of the expanded structure of the cross wedge rolling die of the present invention;
FIG. 3 is a schematic enlarged view of a structural section taken along the direction A-A in FIG. 2 and a corresponding enlarged view of a transmission intermediate gear shaft rolling blank in accordance with the present invention;
FIG. 4 is an enlarged schematic view of the structure of a rolling blank of a gear box intermediate gear shaft according to the present invention;
FIG. 5 is an enlarged schematic cross-sectional view of the forging die of the intermediate gear shaft blank of the gearbox of the present invention.
In the drawing, 1, a conical shaft, 2, a large disc, 3, a connecting shaft, 4, a small disc, 5, a step shaft, 6, a wedge cross rolling die, 61, a conical shaft rolling die cavity, 62, a connecting shaft rolling die cavity, 63, a rolling disc rolling die cavity, 64, a small disc rolling die cavity, 65, a step shaft rolling die cavity, 66, a cutter, 7, a gearbox intermediate gear shaft rolling blank, 8, a rolling disc, 9, an upper die, 91, a conical shaft forming die cavity, 92, a large disc upper forming die cavity, 93, a groove, 10, a left die, 101, a left die fixing hole, 102, a small disc left side die cavity, 103, a connecting shaft left side die cavity, 104, a large disc lower left side forming die cavity, 105, a left side boss, 106, a step shaft left side die cavity, 11, a right die, 111, a right die fixing hole, 112, a small disc right side die cavity, 113, a connecting shaft right side die cavity 114, a large disc lower right side forming die cavity, 115, a right side boss 116 and a step shaft right side die cavity.
Detailed Description
Referring to fig. 2,3, 4 and 5, the molds required for the present invention are made for producing the intermediate gear shaft blank of the gearbox shown in fig. 1.
As shown in figure 1, the total length of a blank of the intermediate gear shaft of the gearbox is 368mm, the blank consists of a conical shaft 1, a large disc 2, a connecting shaft 3, a small disc 4 and a step shaft 5, the step shaft 5 of the type consists of three shafts with different diameters, the diameter of the outer end of the conical shaft 1 is 30mm, the diameter of the inner end is 43.7mm, the length of the conical shaft is 157.5mm, the diameter of the large disc 2 is 120mm, the length of the large disc is 24.7mm, the diameter of the connecting shaft 3 is 33mm, the length of the connecting shaft is 72.1mm, the diameter of the small disc is 87.6mm, the length of the small disc is 23mm, the diameter of the outer end of the step shaft 5 is 33.2mm, the length of the step shaft is 57.1mm, the diameter of the middle shaft is 40.2mm, the diameter of the inner end of the step shaft is 50mm, and the length of the step shaft is 3.2mm.
The forging and combining production method of the intermediate gear shaft blank of the gearbox is characterized by comprising the following steps of:
firstly, selecting a bar stock, namely cutting the bar stock with the diameter of 80 mm;
Heating the cut bar by adopting an intermediate frequency heating furnace to enable the temperature of the cut bar to reach 1000-1100 ℃;
Thirdly, rolling the heated bar stock into a gear box intermediate gear shaft rolling blank 7 through a cross wedge rolling machine, wherein the temperature of the gear box intermediate gear shaft rolling blank 7 is 950-1000 ℃, and cross wedge rolling dies 6 are symmetrically arranged on upper and lower rollers of the cross wedge rolling machine; the cross wedge rolling die 6 is provided with two symmetrical conical shaft rolling die cavities 61, two symmetrical rolling disc rolling die cavities 63, two symmetrical connecting shaft rolling die cavities 62, two symmetrical small disc rolling die cavities 64, two symmetrical step shaft rolling die cavities 65 and a cutter 66, and the cutter 66 is fixedly arranged at the tail end of the cross wedge rolling die 6 and is positioned at the center of the two step shaft rolling die cavities 65; the bar stock is rolled into two gearbox intermediate gear shaft rolling blanks 7 at a time, the total length of the gearbox intermediate gear shaft rolling blanks 7 is 413.3mm, the bar stock consists of a conical shaft 1, a rolling disc 8, a connecting shaft 3, a small disc 4 and a step shaft 5, the diameter of the outer end of the conical shaft 1 is 29mm, the diameter of the inner end is 42.7mm, the length of the small disc 4 is 157.5mm, the diameter of the rolling disc 8 is 70mm, the length of the rolling disc is 70mm, the diameter of the connecting shaft 3 is 33mm, the length of the small disc 4 is 72.1mm, the diameter of the small disc 4 is 87.6mm, the length of the small disc is 23mm, the diameter of the outer end of the small disc 5 is 33.2mm, the length of the small disc 4 is 57.1mm, the diameter of the middle shaft is 40.2mm, the diameter of the inner shaft is 50mm, the diameter of the inner shaft is 3.2mm, the conical shaft rolling die cavity 61 is matched with the conical shaft 1 of the gearbox intermediate gear shaft rolling blanks 7, the rolling die cavity 63 is matched with the connecting shaft rolling blanks 7 of the gearbox intermediate gear shaft rolling blanks 7, the connecting shaft rolling die cavity 62 is matched with the gearbox intermediate gear shaft rolling blanks 7, the small disc rolling die cavity 64 is matched with the small disc 4 of the transmission intermediate gear shaft rolling blank 7, and the step shaft rolling die cavity 65 is matched with the step shaft 5 of the transmission intermediate gear shaft rolling blank 7;
Forging and pressing the transmission intermediate gear shaft rolling blank 7 into a transmission intermediate gear shaft blank through a press machine, wherein a forging and pressing die is arranged on the press machine and consists of an upper die 9 and a lower die, and the lower die consists of a left die 10 and a right die 11 which are symmetrically arranged; the upper die 9 is internally provided with a conical shaft forming cavity 91, a large disc upper forming cavity 92 and a groove 93, the central axes of the conical shaft forming cavity 91, the large disc upper forming cavity 92 and the groove 93 coincide, the groove 93 is positioned at the bottom of the upper die 9, the upper end of the left die 10 is provided with a left boss 105, the inner side wall of the left boss 105 is provided with a large disc lower left forming cavity 104, the inner side wall of the left die 10 is provided with a connecting shaft left side cavity 103, a small disc left side cavity 102 and a step shaft left side cavity 106, the outer side wall of the left die 10 is provided with a left die fixing hole 101 which is fixedly connected with a press machine, the upper end of the right die 11 is provided with a right boss 115, the inner side wall of the right boss 115 is provided with a large disc lower right forming cavity 114, the inner side wall of the right die 11 is provided with a connecting shaft right side cavity 113, a small disc right side cavity 112 and a step shaft right cavity 116, the outer side wall of the right die 11 is provided with a right die fixing hole 111 fixedly connected with the press machine, the conical shaft 91 is matched with the conical shaft left side cavity 103, the left boss 105 and the large disc lower side boss 2 can be conveniently matched with the large disc lower die cavity 2 after the large disc lower boss and the large disc lower die cavity 93 are matched with the large disc upper die cavity 2 and the large disc lower die cavity 93, and the large disc lower die cavity 2 can be conveniently matched with the large disc lower die cavity 2 and the large disc lower die cavity 93 is matched with the upper cavity 2, the rolling disc 8 in the cavity is pressed into a large disc 2 by the large disc upper forming cavity 92, the large disc lower left forming cavity 104 and the large disc lower right forming cavity 114, and the connecting shaft left forming cavity 103 and the connecting shaft right forming cavity 113 are matched with the connecting shaft 3 after being folded;
After the upper die 9 is lifted up by a press machine and the left die 10 and the right die 11 are separated, the transmission intermediate gear shaft rolling blank 7 prepared in the step (three) is put between the left die 10 and the right die 11, after the left die 10 and the right die 11 are closed, the rolling disc 8 is positioned in the large disc lower left forming cavity 104 and the large disc lower right forming cavity 114, the connecting shaft 3 is positioned in the connecting shaft left forming cavity 103 and the connecting shaft right forming cavity 113, the small disc 4 is positioned in the small disc left forming cavity 102 and the small disc right forming cavity 112, the step shaft 5 is positioned in the step shaft left forming cavity 106 and the step shaft right forming cavity 116, the upper die 9 is pressed down, the conical shaft 1 is inserted into the conical shaft forming cavity 9, and the large disc upper forming cavity 92, the large disc lower left forming cavity 104 and the large disc lower right forming cavity 114 press the rolling disc 8 in the cavities into the large disc 2, so that the transmission intermediate gear shaft blank is prepared.
A forging and pressing die for forging and pressing combination production of a blank of an intermediate gear shaft of an upper gearbox comprises an upper die 9 and a lower die, and is characterized in that the lower die consists of a left die 10 and a right die 11 which are symmetrically arranged, a conical shaft forming cavity 91, a large disc upper forming cavity 92 and a groove 93 are arranged in the upper die 9, central axes of the conical shaft forming cavity 91, the large disc upper forming cavity 92 and the groove 93 are overlapped, the groove 93 is positioned at the bottom of the upper die 9, a left boss 105 is arranged at the upper end of the left die 10, a large disc lower forming cavity 104 is arranged on the inner side wall of the left boss 105, a connecting shaft left die cavity 103, a small disc left die cavity 102 and a step shaft left die cavity 106 are arranged on the inner side wall of the left die 10, a left die fixing hole 101 which is fixedly connected with a press machine is arranged on the outer side wall of the left die 10, a large disc lower forming cavity 114 is arranged on the inner side wall of the right die 11, a large disc lower die 113 is arranged on the inner side wall of the right disc upper end of the large disc upper die 11, a large disc lower die cavity 113 is arranged on the inner side wall of the large disc lower die 115, a large disc lower die cavity 112 is arranged on the inner side wall of the large disc 11 and is arranged on the inner side wall of the large disc lower die 11, the large disc lower die cavity 112 is matched with the large disc lower die cavity 2, the large disc lower die cavity 112 is arranged on the inner side of the large disc lower die cavity 2 is matched with the large disc lower die cavity 2, and the large disc upper die cavity 2 is matched with the large disc lower die cavity 2, and the large disc lower die cavity 2 is conveniently arranged on the inner side of the large disc lower die cavity 2 is matched with the large disc lower die cavity 2, and the large disc lower die cavity 2 is matched with the large die cavity 2 is arranged on the large die lower cavity 2, the upper die lower cavity 2 is, the rolling disc 8 in the cavity is pressed into a large disc 2 by the large disc lower right forming cavity 114, the connecting shaft left side cavity 103 and the connecting shaft right side cavity 113 are matched with the connecting shaft 3 after being folded, the small disc left side cavity 102 and the small disc right side cavity 112 are matched with the small disc 4 after being folded, and the step shaft left side cavity 106 and the step shaft right side cavity 116 are matched with the step shaft 5 after being folded.
Claims (2)
1. The rolling and forging combined production method of the intermediate gear shaft blank of the gearbox is characterized by comprising the following steps of:
firstly, selecting a bar stock, namely cutting the bar stock with the diameter of 80 mm;
Heating the cut bar by adopting an intermediate frequency heating furnace to enable the temperature of the cut bar to reach 1000-1100 ℃;
Thirdly, rolling the heated bar stock into a gear box intermediate gear shaft rolling blank (7) through a cross wedge rolling machine, wherein the temperature of the gear box intermediate gear shaft rolling blank (7) is 950-1000 ℃, and cross wedge rolling dies (6) are symmetrically arranged on upper and lower rollers of the cross wedge rolling machine; the cross wedge rolling die (6) is provided with two symmetrical conical shaft rolling die cavities (61), two symmetrical rolling disc rolling die cavities (63), two symmetrical connecting shaft rolling die cavities (62), two symmetrical small disc rolling die cavities (64), two symmetrical step shaft rolling die cavities (65) and a cutter (66), the cutter (66) is fixedly arranged at the tail end of the cross wedge rolling die (6) and positioned at the center of the two step shaft rolling die cavities (65), a bar stock is rolled into two gearbox intermediate gear shaft rolling blanks (7) at one time, the total length of the gearbox intermediate gear shaft rolling blanks (7) is 413.3mm, the total length of the gearbox intermediate gear shaft rolling blanks is composed of a conical shaft (1), a rolling disc (8), a connecting shaft (3), a small disc (4) and a step shaft (5), the diameter of the outer end of the conical shaft (1) is 29mm, the diameter of the inner end of the conical shaft is 42.7mm, the length of the conical shaft is 157.5mm, the diameter of the rolling disc (8) is 70mm, the diameter of the connecting shaft (3) is 33.3 mm, the diameter of the small disc (4.7 mm), and the diameter of the conical shaft (5) is 33.7 mm, the step shaft (5) is provided with three shafts with different diameters, the diameter of the shaft at the outer end is 33.2mm, the length of the shaft is 57.1mm, the diameter of the shaft at the middle is 40.2mm, the length of the shaft at the inner end is 30.4mm, the diameter of the shaft at the inner end is 50mm, the length of the shaft at the inner end is 3.2mm, the conical shaft rolling die cavity (61) is matched with the conical shaft (1) of the transmission intermediate gear shaft rolling blank (7), the rolling disc rolling die cavity (63) is matched with the rolling disc (8) of the transmission intermediate gear shaft rolling blank (7), the connecting shaft rolling die cavity (62) is matched with the connecting shaft (3) of the transmission intermediate gear shaft rolling blank (7), the small disc rolling die cavity (64) is matched with the small disc (4) of the transmission intermediate gear shaft rolling blank (7), and the step shaft rolling die cavity (65) is matched with the step shaft (5) of the transmission intermediate gear shaft rolling blank (7);
Forging and pressing a transmission intermediate gear shaft rolling blank (7) into a transmission intermediate gear shaft blank through a press machine, wherein the press machine is provided with a forging and pressing die, the forging and pressing die consists of an upper die (9) and a lower die, the lower die consists of a left die (10) and a right die (11) which are symmetrically arranged, a conical shaft forming cavity (91), a large disc upper forming cavity (92) and a groove (93) are arranged in the upper die (9), the central axes of the conical shaft forming cavity (91), the large disc upper forming cavity (92) and the groove (93) coincide, the groove (93) is positioned at the bottom of the upper die (9), the upper end of the left die (10) is provided with a left boss (105), the inner side wall of the left boss (105) is provided with a large disc lower left forming cavity (103), the inner side wall of the left disc (102) and the left step shaft forming cavity (106), the outer side wall of the left die (10) is provided with a connecting hole (101) fixedly connected with the press machine, and the inner side wall (115) of the right die (11) is provided with a large boss (115) A right die fixing hole (111) which is fixedly connected with a press is formed in the outer side wall of the right die (11), the conical shaft forming cavity (91) is matched with the conical shaft (1), the left boss (105) and the right boss (115) are matched with the groove (93) after being folded so as to be inserted into the groove (93) cavity after the left boss (105) and the right boss (115) are folded, the large disc upper forming cavity (92) is matched with the upper part of the large disc (2), the large disc lower left forming cavity (104) and the large disc lower right forming cavity (114) are matched with the lower part of the large disc (2), and the large disc upper forming cavity (92) and the large disc lower left forming cavity (104) are matched in the process of clamping the upper die (9) and the lower die, the rolling disc (8) in the cavity is pressed into a large disc (2) by a forming cavity (114) on the right side of the lower part of the large disc, and the left side cavity (103) of the connecting shaft and the right side cavity (113) of the connecting shaft are matched with the connecting shaft (3) after being folded;
After the upper die (9) is lifted by a press machine, the left die (10) and the right die (11) are separated, the transmission intermediate gear shaft rolling blank (7) manufactured in the step (three) is placed between the left die (10) and the right die (11), after the left die (10) and the right die (11) are folded, the rolling disc (8) is positioned in the large disc lower left forming cavity (104) and the large disc lower right forming cavity (114), the connecting shaft (3) is positioned in the connecting shaft left forming cavity (103) and the connecting shaft right forming cavity (113), the small disc (4) is positioned in the small disc left forming cavity (102) and the small disc right forming cavity (112), the step shaft (5) is positioned in the step shaft left forming cavity (106) and the step shaft right forming cavity (116), the upper die (9) is pressed down, the large disc upper forming cavity (92) is inserted into the conical shaft forming cavity (9), the large disc upper forming cavity (92) is positioned in the large disc lower left forming cavity (104) and the large disc lower right forming cavity (114), and the transmission intermediate gear shaft rolling blank (8) is pressed into the disc intermediate forming cavity (2).
2. The forging and pressing die for the blank of the intermediate gear shaft of the gearbox comprises an upper die (9) and a lower die, and is characterized in that the lower die consists of a left die (10) and a right die (11) which are symmetrically arranged, a conical shaft forming cavity (91), a large disc upper forming cavity (92) and a groove (93) are arranged in the upper die (9), central axes of the conical shaft forming cavity (91), the large disc upper forming cavity (92) and the groove (93) coincide, the groove (93) is positioned at the bottom of the upper die (9), the upper end of the left die (10) is provided with a left boss (105), the inner side wall of the left boss (105) is provided with a large disc lower left forming cavity (104), the inner side wall of the left die (10) is provided with a connecting shaft left side cavity (103), a small disc left side cavity (102) and a step shaft left cavity (106), the outer side wall of the left die (10) is provided with a left die fixing hole (101) which is fixedly connected with a press machine, the upper end of the right die (11) is provided with a right boss (115), the inner side wall of the right die (112) is provided with a large disc lower side boss (114), the right die (11) is provided with a right die fixing hole (111) which is fixedly connected with a press machine, the conical shaft forming cavity (91) is matched with a conical shaft (1) of a gear box intermediate gear shaft blank, the left boss (105) and the right boss (115) are matched with the groove (93) after being folded, the large disc upper forming cavity (92) is matched with the upper part of a large disc (2) of the gear box intermediate gear shaft blank, the large disc lower left forming cavity (104) and the large disc lower right forming cavity (114) are matched with the lower part of the large disc (2) of the gear box intermediate gear shaft blank after being folded, the connecting shaft left side cavity (103) and the connecting shaft right side cavity (113) are matched with a connecting shaft (3) of the gear box intermediate gear shaft blank, the small disc left side cavity (102) and the small disc right side cavity (112) are matched with a small disc (4) of the gear box intermediate gear shaft blank after being folded, and the step shaft left side cavity (106) and the step shaft right side cavity (116) are matched with a step cavity (5) of the gear box intermediate gear shaft blank.
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| CN216911981U (en) * | 2022-02-10 | 2022-07-08 | 山东汇锋传动股份有限公司 | Forging and pressing die for rolling and forging combined production of intermediate gear shaft blank of gearbox |
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| JP2005254285A (en) * | 2004-03-11 | 2005-09-22 | Nissan Motor Co Ltd | Forging die |
| KR100603995B1 (en) * | 2005-06-24 | 2006-07-25 | 진산금속 주식회사 | Manufacturing method of pinion drive shaft |
| KR100991235B1 (en) * | 2008-02-29 | 2010-11-01 | 주식회사태진정공 | Intermediate moldings for processing pinion shafts for steering devices, methods for manufacturing intermediate moldings and lower molds for manufacturing intermediate moldings |
| US7866198B2 (en) * | 2008-03-26 | 2011-01-11 | American Axle & Manufacturing, Inc. | Method of producing a stepped shaft |
| CN201505666U (en) * | 2009-09-29 | 2010-06-16 | 莱芜市汇锋汽车轴齿有限公司 | Cross wedge rolling polywedge synchronous rolling automobile through shaft blank die |
| CN102601277B (en) * | 2012-03-11 | 2014-03-05 | 莱芜市汇锋汽车轴齿有限公司 | Automobile gearbox intermediate gear shaft blank three-time wedging mould and rolling method thereof |
| CN103949575B (en) * | 2014-05-19 | 2015-12-09 | 莱芜鑫科汽车零部件有限公司 | Transmission main shaft vertical forging production method and special forging mold |
| CN104723037B (en) * | 2015-03-20 | 2017-06-13 | 北京科技大学 | Automotive transmission input shaft combined forming process and forge die |
| CN105945200A (en) * | 2016-06-25 | 2016-09-21 | 山东汇锋传动股份有限公司 | Assembling die for transverse rolled preformed blank of gearbox output shaft |
| CN107377859A (en) * | 2017-08-31 | 2017-11-24 | 四川凯茨实业集团有限公司 | The manufacturing process of middle forged shaft non-trimming forging |
| CN110576140A (en) * | 2019-10-17 | 2019-12-17 | 瑞安市繁盛紧固件股份有限公司 | Multi-step shaft rod cold heading die |
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