Shaft part frustum forging tool and forging method

Abstract

The invention relates to a shaft frustum forging tool and a forging method, belongs to the technical field of forging, and solves the problems of complex process, large forging allowance and high cost of a shaft frustum forging method in the prior art. The tool comprises an upper flat anvil and a lower V anvil, the anvil face, making contact with the blank, of the upper flat anvil comprises a first inclined face X1 and a second inclined face X2 which are sequentially arranged in the width direction of the upper flat anvil, and the first inclined face X1 and the second inclined face X2 extend towards the two long sides of the anvil face respectively and incline in the direction away from the blank. The anvil face, making contact with the blank, of the lower V-shaped anvil comprises a third inclined face X3 and a fourth inclined face X4 which are sequentially arranged in the width direction of the lower V-shaped anvil, and the third inclined face X3 and the fourth inclined face X4 extend towards the two long sides of the anvil face correspondingly and incline in the direction away from the blank. The first inclined plane X1 corresponds to the third inclined plane X3, and the second inclined plane X2 corresponds to the fourth inclined plane X4. The tool forging method is simple, the forging allowance is small, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of forging, and in particular to a forging tool and a forging method for a cone of a shaft-type part. Background Art

[0002] The roller neck bearing installation part of the hot rolling backup roller is a tapered roller neck. The existing forging tooling includes an upper flat anvil and a lower V anvil, and the working surfaces of the upper flat anvil and the lower V anvil are both flat, but when using the tooling for forging production, only straight steps can be forged.

[0003] In the prior art, when forging a tapered roll neck using an existing forging tool, the tapered roll neck is generally forged into multiple straight steps first, and then the multiple straight steps are machined into a tapered step. This method results in a complicated forging process, a large forging margin, and is not conducive to controlling the forging cost. Summary of the invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a forging tool and method for a cone forging of shaft parts, so as to solve at least one of the problems of the existing cone forging method for shaft parts, namely, complex process, large forging margin and high cost.

[0005] On the one hand, the present invention provides a shaft-type frustum forging tool, the shaft-type frustum forging tool comprising an upper flat anvil and a lower V-anvil;

[0006] The anvil surface of the upper flat anvil in contact with the blank comprises a first inclined surface X1 and a second inclined surface X2 arranged in sequence along the width direction of the upper flat anvil, wherein the first inclined surface X1 and the second inclined surface X2 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0007] The anvil surface of the lower V-anvil in contact with the blank comprises a third inclined surface X3 and a fourth inclined surface X4 sequentially arranged along the width direction of the lower V-anvil, wherein the third inclined surface X3 and the fourth inclined surface X4 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0008] The first inclined surface X1 corresponds to the third inclined surface X3, and the second inclined surface X2 corresponds to the fourth inclined surface X4.

[0009] Preferably, the slope ⊿1 of the first inclined surface X1 is calculated according to the taper △ of the frustum, and the relationship between the taper △ of the frustum and the slope ⊿1 of the first inclined surface is: △=2⊿1.

[0010] Preferably, the inclination height h1 of the first inclined surface X1 is equal to the inclination height h2 of the second inclined surface X2.

[0011] Preferably, a projection length b1 of the first inclined surface X1 on the horizontal plane is not equal to a projection length b2 of the second inclined surface X2 on the horizontal plane.

[0012] Preferably, the difference between b1 and b2 is no more than 200 mm.

[0013] Preferably, a projection length b1 of the first inclined surface X1 on the horizontal plane is equal to a projection length b2 of the second inclined surface X2 on the horizontal plane.

[0014] Preferably, the sum of b1 and b2 is smaller than the width of the upper anvil.

[0015] Preferably, the sum of b1 and b2 is equal to the width of the upper anvil.

[0016] In a second aspect, a method for forging a cone of a shaft-like component is provided, wherein the method adopts the above-mentioned cone forging tool for a shaft-like component, and the method comprises:

[0017] (1) Install the upper flat anvil on the upper anvil seat, and install the upper anvil seat and the upper flat anvil on the press together, place the lower V-shaped anvil on the press platform, and align the upper flat anvil and the lower V-shaped anvil;

[0018] (2) The blank is transported to the space between the upper flat anvil and the lower V-anvil of the press for forging. The first inclined surface X1 is close to the large diameter end of the cone to be forged, and the second inclined surface X2 is close to the small diameter end of the cone to be forged. The blank is fed axially from the large diameter end of the cone to be forged to the small diameter end of the cone to be forged, and finally a cone structure is formed.

[0019] Preferably, for every axial feed b1, the radial forging diameter size is reduced by 2*h1, and the length of the cone is controlled by multi-hammer connection, wherein b1 is the projection length of the first inclined surface X1 on the horizontal plane, and h1 is the inclination height of the first inclined surface X1.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] 1. The anvil surfaces of the upper flat anvil and the lower V anvil of the forging tool of the present invention that contact the blank are inclined structures. During implementation, the first inclined surface X1 is close to the large diameter end of the frustum to be forged, and the second inclined surface X2 is close to the small diameter end of the frustum to be forged. Feeding is carried out in sequence from the large diameter end of the frustum to be forged to the small diameter end of the frustum to be forged in the axial direction, and finally a frustum structure is formed. Compared with the traditional forging tool with a flat anvil surface, the forging tool and forging method of the present invention can directly forge a frustum structure, and the forging method is simple, efficient, small forging allowance, and low cost.

[0022] 2. In the present invention, for every axial feed b1, the radial forging diameter is reduced by 2*h1, and the length of the frustum is controlled by multi-hammer connection, that is, the diameter of the frustum at each location and the length of the frustum can be accurately controlled by controlling b1, h1 and multi-hammer connection.

[0023] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are only for the purpose of illustrating specific embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0025] Figure 1 The front view and the side view of the upper flat anvil of the present invention;

[0026] Figure 2 A perspective view of an upper flat anvil of the present invention;

[0027] Figure 3 The front view and side view of the lower V-anvil of the present invention;

[0028] Figure 4 A three-dimensional diagram of the lower V-anvil of the present invention;

[0029] Figure 5 It is a force analysis diagram of the contact surface between the upper flat anvil and the blank of the present invention;

[0030] Figure 6 It is a position diagram of the forging tool and the blank of the present invention;

[0031] Figure 7 A schematic diagram of the process of forging a frustum using the forging tool of the present invention;

[0032] Figure 8 The upper flat anvil structure dimension diagram of Example 1;

[0033] Fig. 9 The lower V-anvil structure dimension diagram of Example 1;

[0034] Fig.10 is a rough drawing of the forging of Example 2;

[0035] Fig.11 is a rough image of the forging of Comparative Example 1;

[0036] Fig.12 This is a structural dimension diagram of the upper flat anvil of Example 3;

[0037] Fig.13 The lower V-anvil structure dimension diagram of Example 3;

[0038] Fig.14 is a rough drawing of the forging of Example 4;

[0039] Fig.15 This is a rough picture of the forging of comparative example 2.

[0040] Reference numerals:

[0041] X1-first inclined plane; X2-second inclined plane; X3-third inclined plane; X4-fourth inclined plane; h1-inclination height of the first inclined plane X1; h2-inclination height of the second inclined plane X2; b1-projection length of the first inclined plane X1 on the horizontal plane; b2-projection length of the second inclined plane X2 on the horizontal plane; P1-component force of the first inclined plane X1 in the horizontal direction; P2-component force of the second inclined plane X2 in the horizontal direction; L-length of the anvil; H-height of the anvil; W-width of the anvil. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0043] On the one hand, the present invention provides a cone forging tool for shaft parts, such as Figure 1-Figure 4 The axle-type cone forging tooling comprises an upper flat anvil and a lower V-anvil;

[0044] The anvil surface of the upper flat anvil in contact with the blank comprises a first inclined surface X1 and a second inclined surface X2 arranged in sequence along the width direction of the upper flat anvil, wherein the first inclined surface X1 and the second inclined surface X2 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0045] The anvil surface of the lower V-anvil in contact with the blank comprises a third inclined surface X3 and a fourth inclined surface X4 sequentially arranged along the width direction of the lower V-anvil, wherein the third inclined surface X3 and the fourth inclined surface X4 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0046] The first inclined surface X1 corresponds to the third inclined surface X3, and the second inclined surface X2 corresponds to the fourth inclined surface X4.

[0047] It should be noted that the "corresponding" in the present invention means that the first inclined plane X1 and the third inclined plane X3 are arranged in correspondence, and the slopes of the first inclined plane X1 and the third inclined plane X3 and the lengths of the projections on the horizontal plane are equal, and the second inclined plane X2 and the fourth inclined plane X4 are arranged in correspondence, and the slopes of the second inclined plane X2 and the fourth inclined plane X4 and the lengths of the projections on the horizontal plane are equal.

[0048] When implementing, Figure 6 and Figure 7As shown, a cylindrical blank is placed between an upper flat anvil and a lower V-anvil for forging, with the first inclined surface X1 close to the large diameter end of the frustum to be forged, and the second inclined surface X2 close to the small diameter end of the frustum to be forged, and the blank is fed in sequence from the large diameter end of the frustum to be forged to the small diameter end of the frustum to be forged along the axial direction to finally form a frustum structure.

[0049] Compared with the prior art, the anvil surfaces of the upper flat anvil and the lower V-anvil of the forging tool of the present invention that contact the blank are inclined structures. Compared with the traditional forging tool with a flat anvil surface, the forging tool of the present invention can directly forge a frustum structure, and the forging method is simple, efficient, with small forging allowance and low cost.

[0050] In the present invention, since the first bevel X1 corresponds to the third bevel X3 and the second bevel X2 corresponds to the fourth bevel X4, once the structures of the first bevel X1 and the second bevel X2 of the upper flat anvil are determined, the structure of the lower V-anvil is also determined accordingly.

[0051] Exemplarily, the slope ⊿1 of the first inclined surface X1 is calculated according to the taper △ of the frustum, and the relationship between the taper △ of the frustum and the slope ⊿1 of the first inclined surface is: △=2⊿1; and since the slope formula of the first inclined surface X1 is Therefore, the relationship between h1 and b1 can be obtained from the above two formulas.

[0052] It should be noted that the slope refers to the inclination of the inclined plane relative to the horizontal plane; the taper refers to the ratio of the diameter difference between the upper and lower end circles of the frustum to the height of the frustum when the frustum is placed vertically.

[0053] In the present invention, the first inclined surface X1 is the main working inclined surface, such as Figure 7 As shown, the conical surface of the frustum is mainly formed by the first inclined surface X1 pressing down the blank, and the second inclined surface X2 is used to balance the load of the first inclined surface X1 pressing down.

[0054] like Figure 5 As shown, when the horizontal force P1 of the first inclined plane X1 is equal to the horizontal force P2 of the second inclined plane X2, the second inclined plane X2 can balance the load pressed by the first inclined plane X1 to avoid damage to the press caused by horizontal eccentric load. In order to make P1=P2, the inclined height h1 of the first inclined plane X1 is equal to the inclined height h2 of the second inclined plane X2.

[0055] Exemplarily, a projection length b1 of the first inclined surface X1 on the horizontal plane may be different from a projection length b2 of the second inclined surface X2 on the horizontal plane.

[0056] However, in order to avoid uneven load in the direction perpendicular to the press, b1 and b2 should not differ too much. Preferably, the difference between b1 and b2 is not greater than 200 mm. For example, the difference between b1 and b2 is 40 mm, 80 mm, 100 mm, 140 mm, 180 mm, etc.

[0057] In a most preferred embodiment, a projection length b1 of the first inclined surface X1 on the horizontal plane is equal to a projection length b2 of the second inclined surface X2 on the horizontal plane.

[0058] In the present invention, the values ​​of b1 and b2 can be determined comprehensively based on the size of the specific blank, the anvil width ratio and the press capacity.

[0059] In one embodiment, the sum of b1 and b2 is smaller than the width of the upper anvil. In this embodiment, a plane is further provided between the first inclined surface X1 and the second inclined surface X2.

[0060] In another embodiment, the sum of b1 and b2 is equal to the width of the upper anvil.

[0061] It can be understood that when designing the specific structural dimensions of the first inclined surface X1 and the second inclined surface X2, the values ​​of b1 and b2 are determined based on the size of the specific blank, the anvil width ratio and the press capacity, and the slope ⊿1 of the first inclined surface X1 is calculated based on the taper △ of the cone, and then according to the slope formula After calculating h1, the structure of the first inclined surface X1 can be determined according to b1 and h2; since h1=h2, the structure of the second inclined surface X2 can be determined according to b2 and h2, that is, the anvil surface structure of the upper flat anvil is determined. Since the anvil surface structure of the lower V anvil corresponds to the anvil surface structure of the upper flat anvil, the anvil surface structure of the lower V anvil is also determined.

[0062] Exemplarily, the height H, width W, and length L of the upper flat anvil and the lower V-anvil can be selected according to the matching anvil and press space in accordance with the prior art method, which will not be described in detail here.

[0063] On the other hand, the present invention also provides a method for forging a cone of a shaft-like component, wherein the method uses the above-mentioned cone forging tool for a shaft-like component, such as Figure 6 and Figure 7 As shown, the method includes:

[0064] (1) Install the upper flat anvil on the upper anvil seat, and install the upper anvil seat and the upper flat anvil on the press together, place the lower V-shaped anvil on the press platform, and align the upper flat anvil and the lower V-shaped anvil;

[0065] (2) The blank is transported to the space between the upper flat anvil and the lower V-anvil of the press for forging. The first inclined surface X1 is close to the large diameter end of the cone to be forged, and the second inclined surface X2 is close to the small diameter end of the cone to be forged. The blank is fed axially from the large diameter end of the cone to be forged to the small diameter end of the cone to be forged, and finally a cone structure is formed.

[0066] Specifically, for every axial feed b1 of the billet, the radial forging diameter is reduced by 2*h1, and the length of the cone is controlled by multi-hammer connection, wherein b1 is the projection length of the first inclined surface X1 on the horizontal plane, and h1 is the inclination height of the first inclined surface X1.

[0067] For example, Figure 7 As shown, the cylindrical billet is forged by the first hammer. After the first hammer (first circle) is pressed, the billet diameter at the position corresponding to the first inclined surface X1 of the first hammer is reduced by 2*h1; the billet is fed b1 along the axial direction to perform the second hammer forging. After the second hammer is pressed, the billet diameter at the position corresponding to the first inclined surface X1 of the second hammer is reduced by 2*h1 compared with that of the first hammer; the billet is fed b1 along the axial direction to perform the third hammer forging. After the third hammer is pressed, the billet diameter at the position corresponding to the first inclined surface X1 of the third hammer is reduced by 2*h1 compared with that of the second hammer; after completing the three hammers, the cylindrical billet has formed a conical table top, and the discarded material on the left side of the conical table top is removed. The length of the conical table top is 3*b1.

[0068] The following is a further explanation of the forging tool and forging method for a cone-shaped shaft component of the present invention through specific embodiments.

[0069] Example 1

[0070] This embodiment provides a frustum forging tool for shaft parts, such as Figure 8 and Fig. 9 As shown, the cone roller neck part (taper is 1:5.647058) used for forging the hot rolling support roller, the shaft-type cone forging tooling includes an upper flat anvil and a lower V anvil;

[0071] The anvil surface of the upper flat anvil in contact with the blank comprises a first inclined surface X1 and a second inclined surface X2 arranged in sequence along the width direction of the upper flat anvil, wherein the first inclined surface X1 and the second inclined surface X2 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0072] The anvil surface of the lower V-anvil in contact with the blank comprises a third inclined surface X3 and a fourth inclined surface X4 sequentially arranged along the width direction of the lower V-anvil, wherein the third inclined surface X3 and the fourth inclined surface X4 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0073] The first inclined surface X1 corresponds to the third inclined surface X3, and the second inclined surface X2 corresponds to the fourth inclined surface X4.

[0074] The inclination height h1 of the first inclined surface X1 and the inclination height h2 of the second inclined surface X2 are both 26.5 mm.

[0075] The projection length b1 of the first inclined plane X1 on the horizontal plane is 300 mm, and the projection length b2 of the second inclined plane X2 on the horizontal plane is 300 mm. A plane is also provided between the first inclined plane X1 and the second inclined plane X2.

[0076] The length of the upper flat anvil is 2300mm, the height is 1000mm, and the width is 800mm. The length of the lower V anvil is 2300mm, the height is 1200mm, and the width is 800mm. The V-shaped structure angle is 100 degrees, and the V-shaped structure height is 590mm.

[0077] Example 2

[0078] This embodiment provides a method for forging a cone of a shaft, wherein the forging tool of Embodiment 1 is used to forge the cone neck of a hot-rolled support roller (the taper is 1:5.647058), and the rough drawing of the forging is as follows: Fig.10 As shown, the required billet weight is 43.6 tons, including:

[0079] (1) Install the upper flat anvil on the upper anvil seat, and install the upper anvil seat and the upper flat anvil on the press together, place the lower V-shaped anvil on the press platform, and align the upper flat anvil and the lower V-shaped anvil;

[0080] (2) The 1430 mm cylindrical billet is heated to the starting forging temperature and then taken out of the furnace and transported to the space between the upper flat anvil and the lower V anvil of the press for forging. The first inclined surface X1 is close to the large diameter end of the cone to be forged, and the second inclined surface X2 is close to the small diameter end of the cone to be forged. Press down at the position required by the forging process (1430 mm × 850 mm), and set the target size (the cross-sectional diameter close to the edge end of the first inclined surface X1) to 1065 mm. After pressing one circle, the auxiliary tool is fed 300 mm and the target size is adjusted to 1012 mm. After pressing another circle, the auxiliary tool is fed 300 mm again and the target size is adjusted to 959 mm. After 3 rounds of pressing, the tapered roller neck length is 900mm. The forging drawing requires the tapered roller neck length to be 925mm. It needs to be fed again by 25mm. The target size is calculated as Ф950mm according to the slope, and the corresponding small head size of the tapered step is Ф840mm. At this point, the tapered roller neck is forged. The other straight step shafts of the hot rolling support roller can be forged by traditional upper flat and lower V anvil.

[0081] Comparative Example 1

[0082] This comparative example provides a method for forging a cone of a shaft member in the prior art, that is, an upper flat anvil and a lower V-anvil with flat anvil surfaces are used to forge the cone roll neck of the hot rolling support roll (the taper is 1:5.647058) which is the same as that in Example 2. The rough drawing of the forging is as shown in FIG. Fig.11 As shown in the figure (the neck of the tapered roller is designed as two straight steps for forging), the required billet weight is 44.6 tons, including:

[0083] (1) Install an upper flat anvil with a flat anvil surface on an upper anvil seat, and install the upper anvil seat and the upper flat anvil on a press together, and place a lower V-shaped anvil with a flat anvil surface on a press platform, with the upper flat anvil and the lower V-shaped anvil aligned;

[0084] (2) The 1430 mm diameter cylindrical billet is heated to the initial forging temperature and then taken out of the furnace and transported to the upper flat anvil and the lower V anvil of the press for forging. Two straight steps are forged at the neck of the tapered roller, and then the two straight steps at the neck of the tapered roller are machined into tapered steps. The other straight step shafts of the hot-rolled support roller can also be forged using the traditional upper flat and lower V anvil.

[0085] Example 3

[0086] This embodiment provides a frustum forging tool for shaft parts, such as Fig.12 and Fig.13 As shown, a frustum (taper of 1:3) for shaft forgings, the frustum forging tool for shaft forgings comprises an upper flat anvil and a lower V anvil;

[0087] The anvil surface of the upper flat anvil in contact with the blank comprises a first inclined surface X1 and a second inclined surface X2 arranged in sequence along the width direction of the upper flat anvil, wherein the first inclined surface X1 and the second inclined surface X2 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0088] The anvil surface of the lower V-anvil in contact with the blank comprises a third inclined surface X3 and a fourth inclined surface X4 sequentially arranged along the width direction of the lower V-anvil, wherein the third inclined surface X3 and the fourth inclined surface X4 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank;

[0089] The first inclined surface X1 corresponds to the third inclined surface X3, and the second inclined surface X2 corresponds to the fourth inclined surface X4.

[0090] The inclination height h1 of the first inclined surface X1 and the inclination height h2 of the second inclined surface X2 are both 50 mm.

[0091] The projection length b1 of the first inclined plane X1 on the horizontal plane is 300 mm, and the projection length b2 of the second inclined plane X2 on the horizontal plane is 300 mm. A plane is also provided between the first inclined plane X1 and the second inclined plane X2.

[0092] The length of the upper flat anvil is 2300mm, the height is 1000mm, and the width is 800mm. The length of the lower V anvil is 2300mm, the height is 1200mm, and the width is 800mm. The V-shaped structure angle is 100 degrees, and the V-shaped structure height is 590mm.

[0093] Example 4

[0094] This embodiment provides a method for forging a cone of a shaft-type part. The forging tool of Embodiment 3 is used to forge a cone of a shaft-type forging (with a taper of 1:3). The rough drawing of the forging is as follows: Fig.14 As shown, the required billet weight is 37.3 tons, including:

[0095] (1) Install the upper flat anvil on the upper anvil seat, and install the upper anvil seat and the upper flat anvil on the press together, place the lower V-shaped anvil on the press platform, and align the upper flat anvil and the lower V-shaped anvil;

[0096] (2) The 1340 mm diameter cylindrical billet is heated to the starting forging temperature and then taken out of the furnace and transported to the upper flat anvil and the lower V anvil of the press for forging. The first inclined surface X1 is close to the large diameter end of the forged cone, and the second inclined surface X2 is close to the small diameter end of the forged cone. Press down at the position required by the forging process, and set the target size to 1340 mm. After pressing one circle, the auxiliary tool feeds 300 mm and adjusts the target size to 1240 mm. After pressing one circle, the auxiliary tool feeds 300 mm again and adjusts the target size to 1140 mm. After pressing one circle, the auxiliary tool feeds 300 mm again and adjusts the target size to 1040 mm. The small head size of the corresponding conical step is 940 mm. At this point, the cone is forged.

[0097] Comparative Example 2

[0098] This comparative example provides a prior art method for forging a cone of a shaft-type part. A cone of a shaft-type forging identical to that of Example 4 is prepared directly by machining (with a taper of 1:3). The rough plan view of the forging is as follows: Fig.15 As shown, the required billet weight is 44.5 tons, including: first forging a Ф1340mm cylindrical billet, and then machining the two ends of the billet into conical steps through machining.

[0099] According to the comparison between Example 2 and Comparative Example 1, it can be seen that the weight of the cylindrical blank required for forging the cone of a shaft-like part using the forging tool of the present invention is reduced by about 1 ton than the weight of the cylindrical blank required for forging the cone of a shaft-like part using the traditional forging tool. That is, the forging tool of the present invention has a small forging allowance and a low manufacturing cost.

[0100] According to the comparison between Example 4 and Comparative Example 2, it can be seen that the weight of the cylindrical blank required for forging the cone of a shaft-like part using the forging tool of the present invention is reduced by about 7.2 tons compared with the weight of the cylindrical blank required for directly preparing the cone of a shaft-like part by machining. That is, the forging tool of the present invention has a small forging allowance and a low manufacturing cost.

[0101] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A cone forging tool for shaft parts, characterized in that: The axle-type cone forging tool comprises an upper flat anvil and a lower V-anvil; The anvil surface of the upper flat anvil in contact with the blank comprises a first inclined surface X1 and a second inclined surface X2 arranged in sequence along the width direction of the upper flat anvil, wherein the first inclined surface X1 and the second inclined surface X2 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank; The anvil surface of the lower V-anvil in contact with the blank comprises a third inclined surface X3 and a fourth inclined surface X4 sequentially arranged along the width direction of the lower V-anvil, wherein the third inclined surface X3 and the fourth inclined surface X4 extend toward two long sides of the anvil surface respectively and are inclined in a direction away from the blank; The first inclined surface X1 corresponds to the third inclined surface X3, and the second inclined surface X2 corresponds to the fourth inclined surface X4.

2. The frustum forging tool for shaft parts according to claim 1 is characterized in that: The slope ⊿1 of the first inclined surface X1 is calculated according to the taper △ of the frustum, and the relationship between the taper △ of the frustum and the slope ⊿1 of the first inclined surface is: △=2⊿1.

3. The frustum forging tool for shaft parts according to claim 1 is characterized in that: The inclination height h1 of the first inclined surface X1 is equal to the inclination height h2 of the second inclined surface X2.

4. The frustum forging tool for shaft parts according to claim 3 is characterized in that: A projection length b1 of the first inclined surface X1 on the horizontal plane is different from a projection length b2 of the second inclined surface X2 on the horizontal plane.

5. The frustum forging tool for shaft parts according to claim 4 is characterized in that: The difference between b1 and b2 is not greater than 200mm.

6. The frustum forging tool for shaft parts according to claim 3 is characterized in that: A projection length b1 of the first inclined surface X1 on the horizontal plane is equal to a projection length b2 of the second inclined surface X2 on the horizontal plane.

7. The frustum forging tool for shaft parts according to claim 4 or 6, characterized in that: The sum of b1 and b2 is smaller than the width of the upper flat anvil.

8. The frustum forging tool for shaft parts according to claim 4 or 6, characterized in that: The sum of b1 and b2 is equal to the width of the upper flat anvil.

9. A method for forging a cone of a shaft, characterized in that: The method adopts the cone forging tool for shaft parts according to any one of claims 1 to 7, and the method comprises: (1) Install the upper flat anvil on the upper anvil seat, and install the upper anvil seat and the upper flat anvil on the press together, place the lower V-shaped anvil on the press platform, and align the upper flat anvil and the lower V-shaped anvil; (2) The blank is transported to the space between the upper flat anvil and the lower V-anvil of the press for forging. The first inclined surface X1 is close to the large diameter end of the cone to be forged, and the second inclined surface X2 is close to the small diameter end of the cone to be forged. The blank is fed axially from the large diameter end of the cone to be forged to the small diameter end of the cone to be forged, and finally a cone structure is formed.

10. The method for forging a cone of a shaft component according to claim 9, characterized in that: For every axial feed b1, the radial forging diameter size is reduced by 2*h1. The length of the cone is controlled by multi-hammer connection, wherein b1 is the projection length of the first inclined surface X1 on the horizontal plane, and h1 is the inclination height of the first inclined surface X1.

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