Stepped shaft lengthening and distributing method and stepped shaft

Abstract

The application provides a stepped shaft elongation and distribution method and a stepped shaft, and relates to the technical field of forging elongation, which aims at improving the elongation and distribution precision of the stepped shaft. The stepped shaft elongation and distribution method comprises the following steps: setting a distribution starting point on a blank for elongation of the stepped shaft; determining the distance value Y from the contact starting position of the blank and the distribution end of the elongation die to the end surface of the distribution end of the elongation die after determining the distribution and pressing amount X of the elongation die according to the selected elongation die and the blank for elongation of the stepped shaft, wherein X=2H, and H is the step height of the pre-shaped stepped section of the stepped shaft; determining the distance value L0 from the end surface of the distribution end of the elongation die to the distribution starting point of the blank before distribution of the blank according to the distance value Y and the pre-shaped stepped section length L of the stepped shaft, wherein L0=L-Y; and placing the blank according to the distance value L0, so that the distance from the distribution starting point of the blank to the end surface of the distribution end of the elongation die is L0. The application can better ensure the quality of the stepped shaft.

Description

Technical Field

[0001] This invention relates to the field of forging and drawing technology, specifically to a stepped shaft drawing and material distribution method and a stepped shaft. Background Technology

[0002] Forging is the primary forming method for stepped shafts, and the parting process often has a significant impact on the dimensions of the stepped shaft. Traditional parting involves directly marking the parting dimensions on the blank to form the stepped shaft or directly pressing indentations into the blank using a pressure roller. The shaft deforms through these indentations as it descends into the steps. However, this method is affected by the edge radius or bevel of the drawing die (flat anvil or shaped anvil) and the operator's experience. As a result, the parting dimension accuracy is insufficient, and the parting dimension often deviates significantly. This leads to the final product failing to meet the process requirements, and in severe cases, resulting in product scrap. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stepped shaft elongation and material distribution method to improve the accuracy of stepped shaft elongation and material distribution.

[0004] The technical problem to be solved by the present invention is to provide a stepped shaft formed by the above-mentioned stepped shaft elongation and material distribution method.

[0005] The technical solution adopted by this invention to solve its technical problem is: a stepped shaft elongation and material distribution method, comprising the following steps:

[0006] Step 1: Set the starting point for material distribution on the blank used for elongating the stepped shaft;

[0007] Step 2: Based on the selected drawing die and the blank used for drawing the stepped shaft, determine the distance Y from the starting position of the blank contacting the drawing die's drawing end to the drawing die's drawing end face after the drawing die's material pressing amount X, where X = 2H, and H is the step height of the pre-formed stepped section of the stepped shaft.

[0008] Step 3: Determine the distance L0 from the end face of the drawing die to the starting point of the material distribution before the material distribution, based on the distance value Y and the length L of the pre-formed step section of the stepped shaft. L0 = LY.

[0009] Step 4: Place the blank according to the distance value L0, so that the distance from the starting point of the blank distribution to the end face of the distribution end of the drawing die is L0.

[0010] Furthermore, step two is simulated using Deform software.

[0011] Furthermore, the drawing die includes an upper die and a lower die that cooperate with each other, and both the upper die and the lower die have a V-shaped cross section.

[0012] The stepped shaft is formed using one of the stepped shaft elongation and material distribution methods described above.

[0013] The beneficial effects of this invention are as follows: The stepped shaft elongation and material distribution method and the stepped shaft of this invention, when forming and distributing the stepped shaft blank, first determine the distance Y from the starting position of the blank contacting the material distribution end of the elongation mold after the material is pressed down by the elongation mold under the action of the elongation mold, to the end face of the material distribution end of the elongation mold, and then determine the distance L0 from the starting point of the blank distribution to the end face of the material distribution end of the long mold based on the distance Y. Finally, determine the material distribution method of the blank placement position based on the distance L0. This method can minimize the material distribution error caused by mold and material parameters, and can better ensure the quality of the stepped shaft. Attached Figure Description

[0014] Figure 1 This is a stepped shaft material distribution diagram;

[0015] Figure 2 This is a schematic diagram of the formation of a stepped shaft;

[0016] Figure 3 It is a curve of the distance Y between the starting position of the blank and the distributing end of the drawing die and the blank after deformation, as shown in the embodiment.

[0017] The figure shows: blank 1, drawing die 2, and material separation starting point 11. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, assuming the length of the pre-formed stepped section of the stepped shaft 1 is L, the traditional method is to use the end point or start point of the pre-formed stepped section of the stepped shaft as a reference before the blank 1 is formed, and then draw lines or indentations based on experience to facilitate positioning during blank forming. However, since the parameters of the drawing die 2, as well as the diameter, material, and pressing amount of the blank 1, all affect the parting length L, the parting length L will change when the drawing die 2 for forming the stepped shaft 1 and the material and parameters of the blank change. Setting the parting length L based on experience has a large error, which can easily lead to the final product not meeting the process requirements and, in severe cases, product scrap.

[0020] like Figure 2 As shown, a stepped shaft elongation and material distribution method of the present invention includes the following steps:

[0021] Step 1: Set the starting point 11 for dividing the material on the blank 1 used for elongating the stepped shaft. The starting point 11 can be one end face of the blank 1, or a line can be drawn on the surface of the blank 1 as the starting point 11 for dividing the material. It can be understood that the starting point 11 is set according to the end point or the starting point of the pre-formed stepped section of the stepped shaft.

[0022] Step 2: Based on the selected drawing die 2 and the blank 1 used for drawing the stepped shaft, determine the distance Y from the starting position of the blank 1 to the end face of the drawing die after the drawing die 2 divides and presses down X, where X = 2H and H is the step height of the pre-formed stepped section of the stepped shaft.

[0023] Step 3: Determine the distance L0 from the end face of the drawing die to the starting point of the material distribution before the material distribution, based on the distance value Y and the length L of the pre-formed step section of the stepped shaft. L0 = LY.

[0024] Step 4: Place the blank according to the distance value L0, so that the distance from the blank distribution starting point 11 to the distribution end face of the drawing die 2 is L0.

[0025] Finally, during forming, the blank is pressed down by the elongation die 2 according to the conventional forming method to form the stepped shaft.

[0026] Step two can be performed by conducting an on-site experiment to obtain the distance value Y, or by simulating it using software. Since on-site experiments would waste a significant amount of material, software simulation is preferred to avoid this waste. Specifically, Deform simulation can be used, where a model is built based on the parameters of the selected drawing die 2 and the blank 1.

[0027] When performing step two, you can first determine the curve of the material distribution pressure of the drawing die 2 and the distance from the starting position of the material distribution end of the blank 1 to the end face of the material distribution end of the drawing die 2 after the blank 1 is deformed by the material distribution pressure through experiments or software simulation, based on the selected drawing die 2 and blank 1. Then, determine the distance value Y when the material distribution pressure is X based on the above curve.

[0028] In this invention, the drawing die 2 can be a flat anvil, that is, it includes an upper flat anvil and a lower flat anvil, or it can be a drawing die with other structures. In the embodiment of this invention, the drawing die includes an upper die and a lower die that cooperate with each other, and the cross-section of the upper die and the lower die is V-shaped, that is, the upper die and the lower die are both V-shaped anvils.

[0029] The present invention also provides a stepped shaft, which is formed by the above-mentioned stepped shaft elongation and material distribution method.

[0030] The stepped shaft elongation and material distribution method and the stepped shaft of the present invention, when forming and distributing the stepped shaft blank, first determine the distance Y from the starting position of the blank contacting the distributing end of the elongation die after the blank is subjected to the downward pressure X of the elongation die under the action of the elongation die, to the end face of the distributing end of the elongation die. Then, based on the distance Y, determine the distance L0 from the starting point of blank distribution to the end face of the distributing end of the elongation die. Finally, determine the placement position of the blank based on the distance L0. This method can minimize the material distribution errors caused by parameters such as the die and materials, and can better ensure product quality. In addition, using the end face of the distributing end of the elongation die as the reference for the placement position of the blank facilitates measurement.

[0031] Example

[0032] The length L of the preformed stepped section of the stepped shaft is 120mm, and the step height H of the stepped section is 15mm.

[0033] The selected drawing die 2 has V-shaped anvils for both the upper and lower molds. The parameters of the V-shaped anvil are: opening angle 120°, top fillet radius R165mm; closing height 155mm, that is, the minimum circle diameter for drawing is φ155mm, the edge of the "V" shaped anvil is beveled at 75×45°, and the transition fillet radius between the horizontal section and the beveled section of the anvil is R100mm.

[0034] Stepped shaft forming blank parameters: φ300mm diameter, TA15 titanium alloy bar;

[0035] Step 1: Set the starting point for material division on the billet. The starting point for material division is one end face of the billet.

[0036] Step 2: First, based on the selected drawing die and the billet used for step shaft drawing, establish the corresponding model in the Deform software; then, use the software to simulate and obtain the relationship curve between the drawing die's pressing amount and the distance from the initial contact position of the billet with the drawing die's dividing end to the end face of the drawing die's dividing end after the billet is deformed by pressing down on it. See [link to relevant documentation]. Figure 3 Finally, based on the relationship curve, the distance Y between the starting position of the blank and the dispensing end of the drawing die after deformation when the blank is deformed by the above drawing die with a pressing amount of 30mm and the end face of the dispensing end of the drawing die is 71.5mm.

[0037] Step 3: Based on the distance value Y and the length L of the pre-formed stepped section of the stepped shaft, determine the distance L0 from the end face of the drawing die to the starting point of the material distribution before the material distribution. L0 = LY = 120 - 71.5 = 48.5 mm.

[0038] Step 4: Place the blank according to the distance value L0, so that the distance from the starting point 11 of the blank to the end face of the drawing die 2 is 48.5mm.

[0039] Step 5: Use the drawing die to press the blank down by 30mm to form a stepped shaft. The stepped shaft is of acceptable size.

Claims

1. A stepped shaft elongation and material distribution method, characterized in that, Includes the following steps: Step 1: Set the starting point for material distribution on the blank used for elongating the stepped shaft; Step 2: Based on the selected drawing die and the blank used for drawing the stepped shaft, determine the distance Y from the starting position of the blank contacting the drawing die's drawing end to the drawing die's drawing end face after the drawing die's material pressing amount X, where X = 2H, and H is the step height of the pre-formed stepped section of the stepped shaft. Step 3: Determine the distance L0 from the end face of the drawing die to the starting point of the material distribution before the material distribution, based on the distance value Y and the length L of the pre-formed step section of the stepped shaft. L0 = LY. Step 4: Place the blank according to the distance value L0, so that the distance from the starting point of the blank distribution to the end face of the distribution end of the drawing die is L0.

2. The stepped shaft elongation and material distribution method as described in claim 1, characterized in that, Step one is simulated using Deform software.

3. The stepped shaft elongation and material distribution method as described in claim 1, characterized in that, The drawing die includes an upper die and a lower die that cooperate with each other, and both the upper die and the lower die have a V-shaped cross section.

4. A stepped shaft, characterized in that, The stepped shaft is formed using a stepped shaft elongation and material distribution method as described in any one of claims 1 to 3.

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