Centering device for producing small-allowance die forgings

Abstract

The utility model discloses a centering device for producing small allowance die forgings, which comprises an upper die and a lower die, a centering column is arranged in the middle of the upper die, a centering groove matched with the centering column is arranged in the middle of the lower die, and the side walls of the centering column and the centering groove are combined structures of straight edges and bevel edges. The upper die and the lower die of the device are provided with the centering column and the centering groove respectively, each of the centering column and the centering groove is provided with a straight edge and a bevel edge, when the upper die begins to move downwards, the upper die is automatically centered through the downward guiding effect of the bevel edges, and when the centered upper die continues to move downwards, the straight edges make contact with each other, so that the movement of the upper die and the lower die in the horizontal direction is limited; even if the upper die tends to incline left and right due to flowing of the middle blank, the upper die can still move only in the vertical direction through limitation of the straight edge, and the defect caused by the fact that upper and lower anvil faces of the free forging press cannot be centered is overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of forging production, and in particular relates to a centering device for producing small-residue die forgings. Background Art

[0002] When producing die forgings, due to the small allowance and high precision, in order to prevent excessive misalignment when the upper and lower dies are closed, resulting in out-of-tolerance size of the forgings, the die is usually divided into two halves, and the upper and lower dies are fixed on the die base, and the die base is fixedly connected to the upper and lower anvils. Free forging presses usually do not have a die base, and the lower anvil is a movable platform, which is used to produce forgings with large allowances and low dimensional accuracy. On free forging presses, the existing die structure has the following main disadvantages for the production of die forgings: the lower die is a movable platform, which makes it impossible to align the upper and lower dies. Therefore, the key to solving the problem of free forging presses producing die forgings is how to align the die so that the misalignment can be controlled.

[0003] The Chinese invention patent with publication number CN113853289A discloses an injection mold with a centering device. At least one centering unit is configured in the cavity of the molding mold to ensure centering during the molding process, but it cannot solve the problem raised by this solution. Utility Model Content

[0004] In order to solve the above problems, the utility model aims to provide a centering device for producing small-residue die forgings.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a centering device for producing small-addition die forgings, including an upper die and a lower die, the upper die is provided with a centering column, the lower die is provided with a centering groove matching the centering column, and the side walls of the centering column and the centering groove are a combination structure of straight edges and beveled edges.

[0006] Preferably, the upper mold is a cross-shaped structure, including four cross-arm-shaped centering columns extending outward and a first mold cavity opened at the intersection of the cross.

[0007] Preferably, the lower mold comprises a cross-shaped groove and four columns, the groove formed between the four columns is a centering groove, and a second mold cavity is opened at the cross intersection of the cross-shaped groove.

[0008] Preferably, the first mold cavity and the second mold cavity are on a vertical horizontal line.

[0009] Preferably, the included angle between the straight edge and the oblique edge of the centering column and the side wall of the centering groove is 3°≤θ≤20°.

[0010] Preferably, the length of the straight side of the centering column and the centering groove is L1, the height of the blank extending out of the lower die is L2, and the lengths of the two satisfy L2≤L1≤L2+20.

[0011] Preferably, the width of the centering column of the upper die is W2, and the width of the centering groove of the lower die is W1, and both satisfy W1-W2=0.1~0.5mm.

[0012] Compared with the prior art, the utility model has the following advantages: the upper die and the lower die of the device are respectively provided with a centering column and a centering groove, and both have a straight edge and a beveled edge. When the upper die starts to move downward, the beveled edge guides the upper die downward automatically, and when the upper die continues to move downward after centering, the straight edges contact, so that the horizontal movement of the upper and lower dies is restricted. Even if the flow of the intermediate billet causes the upper die to tend to tilt left and right, the upper die can still be restricted by the straight edge so that it can only move in the vertical direction, thereby eliminating the defect caused by the inability to center the upper and lower anvil surfaces of the free forging press. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of the upper mold in the utility model;

[0015] Figure 2 It is a structural schematic diagram of the lower mold in the utility model;

[0016] Figure 3 It is a schematic diagram of the assembly of the upper die and the lower die in the utility model;

[0017] Figure 4 This is a schematic diagram of the position of the blank placed in the lower die cavity in the utility model;

[0018] Figure 5 This is a schematic diagram of the upper die centering column aligning with the lower die centering groove in the utility model;

[0019] Figure 6 This is a schematic diagram of the structure in which the upper die moves downward in the utility model;

[0020] Figure 7 This is a schematic diagram of the centering structure in which the upper die in the utility model moves downward so that the centering column contacts the centering groove and automatically guides the centering;

[0021] Figure 8 This is a schematic diagram of the upper die cavity of the utility model contacting the blank and pressing down to complete the forming;

[0022] Fig. 9 This is a schematic diagram of the dimension markings of the centering device in the utility model;

[0023] In the figure, 1-upper die; 2-lower die; 11-centering column; 12-first die cavity; 21-centering groove; 22-second die cavity; 3-blank. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0025] Figure 1 Schematic diagram of the three-dimensional structure of the upper mold 1. The upper mold 1 is a cross-shaped structure, including four cross-arm-shaped centering columns 11 extending outward and a first mold cavity 12 opened at the intersection of the cross. Figure 2 It is a schematic diagram of the three-dimensional structure of the lower mold, including a cross-shaped groove and four columns. The groove formed between the four columns is a centering groove 21, and a second mold cavity 22 is opened at the cross intersection of the cross-shaped groove. Figure 3 It is a schematic diagram of the assembly of the upper die 1 and the lower die 2. The structure of the upper die 1, the lower die 2 and the final size of the die forging that is directly related to the die cavity.

[0026] When producing die forgings, the blank 3 is placed in the second die cavity 22 of the lower die 2, and then the upper die 1 is aligned with the centering column 11 of the lower die 2. During the pressing process, the centering column 11 has an automatic guiding effect until the centering is completed, thereby completing the operation of the free forging press to produce die forgings. The principle of the success of this method lies in the structure of the centering column 11 and the centering groove 21 between the upper and lower dies, which eliminates the defect caused by the inability to center the upper and lower anvil surfaces of the free forging press.

[0027] Action Description:

[0028] Step 1: Place the blank 3 in the second mold cavity 22 of the lower mold 2, as shown in FIG. Figure 4 As shown;

[0029] Step 2: Align the centering column 11 of the upper die 1 with the centering groove 21 of the lower die 2, as shown in FIG. Figure 5 As shown;

[0030] Step 3: The upper anvil drives the upper die 1 to move downward, such as Figure 6 As shown;

[0031] Step 4: The upper die 1 moves downward so that the centering column 11 contacts the centering groove 21 and automatically guides the centering, as shown in FIG. Figure 7 As shown;

[0032] Step 5: The first die cavity 12 of the upper die 1 contacts the blank 3 and continues to press down to complete the forming, such as Figure 8 shown.

[0033] The structural design of the centering device of the upper and lower molds. The centering column 11 of the upper mold 1 and the centering groove 21 of the lower mold 2 both have a straight edge and a beveled edge. When the upper mold 1 starts to move downward, the beveled edge guides the upper mold 1 downward, so that the upper mold 1 is automatically centered. After centering, when the upper mold 1 continues to move downward, the straight edges contact, so that the horizontal movement of the upper and lower molds is restricted. Even if the flow of the intermediate blank causes the upper mold to have a tendency to tilt left and right, the upper mold can still be restricted by the straight edges so that the upper mold moves only in the vertical direction.

[0034] Reference Fig. 9 In order for this structure to work smoothly, the following conditions need to be met:

[0035] (1) The angle between the bevel of the upper and lower molds and the vertical direction must meet the requirements: 3°≤θ≤20°. If the angle is too large or too small, the centering effect will be poor.

[0036] (2) L2≤L1≤L2+20, where: L1 is the length of the straight side of the centering groove 21 or the centering column 11, and L2 is the height of the blank 3 extending out of the lower die. When L1≤L2, the centering column 11 and the centering groove 21 have little effect, which may cause partial insufficiency of the die cavity, excessive local filler, excessive burrs, and in severe cases, the forging is scrapped. However, when L1≥L2+20, the centering column 11 and the centering groove 21 have an effect, but the overall die is high, resulting in unnecessary waste.

[0037] (3) W1-W2 = 0.1-0.5 mm, where W1 is the width of the centering groove 21 of the lower die 2, and W2 is the width of the centering column 11 of the upper die 1. When W1-W2≤0.1, the die may be stuck due to the difference in die heating expansion, and the upper die 1 may be unable to complete the downward pressing. When W1-W2≥0.5 mm, the clearance of the centering device is too large, resulting in excessive misalignment of the die forging, which may lead to scrapping in severe cases.

[0038] The above is a detailed introduction to a centering device for producing small-residue die forgings provided by the utility model. This article uses specific examples to illustrate the structure and working principle of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A centering device for producing small-residue die forgings, comprising an upper die (1) and a lower die (2), characterized in that: The upper die (1) is provided with a centering column (11), and the lower die (2) is provided with a centering groove (21) matching the centering column. The side walls of the centering column (11) and the centering groove (21) are a combination structure of straight edges and bevel edges.

2. The centering device for producing small-residue die forgings according to claim 1, characterized in that: The upper mold (1) is a cross-shaped structure, comprising four cross-arm-shaped centering columns (11) extending outwards and a first mold cavity (12) opened at the intersection of the cross.

3. The centering device for producing small excess die forgings according to claim 1, characterized in that: The lower mold (2) comprises a cross-shaped groove and four upright posts, the groove formed between the four upright posts is a centering groove (21), and a second mold cavity (22) is provided at the cross intersection of the cross-shaped groove.

4. The centering device for producing small excess die forgings according to claim 2 or 3, characterized in that: When the upper mold (1) and the lower mold (2) are combined, the first mold cavity (12) and the second mold cavity (22) are on a vertical horizontal line.

5. The centering device for producing small excess die forgings according to claim 1, characterized in that: The included angle between the straight edge and the oblique edge of the centering column (11) and the side wall of the centering groove (21) is 3°≤θ≤20°.

6. The centering device for producing small excess die forgings according to claim 1, characterized in that: The length of the straight sides of the centering column (11) and the centering groove (21) is L1, and the height of the blank extending out of the lower die (2) is L2, and the lengths of the two satisfy L2≤L1≤L2+20.

7. The centering device for producing small-residue die forgings according to claim 1, characterized in that: The width of the upper die centering column (11) is W2, and the width of the lower die centering groove (21) is W1, and both satisfy W1-W2=0.1-0.5 mm.

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