Upsetting tool for forming forge piece with clamp handle

Abstract

The utility model discloses an upsetting tool for forming a forge piece with a clamp handle, belongs to the technical field of forging, and aims to reduce upsetting leakage. Comprising a cylindrical drain disc body, a through hole penetrating in the axial direction of the drain disc body is formed in the center of the drain disc body, and the through hole is a stepped hole and comprises a cylindrical hole in the bottom, a taper hole with pattern draft in the middle and a ring surface table hole with draft in the top in the axial direction; the ring surface table hole is gradually contracted inwards from the top to the bottom in the axial direction; the diameter of the cylindrical hole is smaller than that of the bottom of the conical hole, and a transition plane is formed between the top end of the cylindrical hole and the bottom end of the conical hole. The through hole is arranged to be the stepped hole, the transition plane between the conical hole and the cylindrical hole serves as a table top to support the clamp handle, the clamp handle is prevented from being suspended, material leakage at the bottom of the clamp handle in the upsetting process is greatly reduced, even material leakage is avoided, the utilization rate of steel ingots is improved, and the purpose of saving materials is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of forging, in particular to a roughing tool with a clamp handle for forming a forging. Background Art

[0002] The use environment of large forgings is usually more complex, so the quality requirements are higher, such as the rotor of thermal power equipment, the support roller of steel rolling mill, the main shaft of hydropower equipment, etc. The forming process includes upsetting, drawing, etc. Upsetting is a forging process that reduces the height of the blank and increases the cross-section. It is a necessary process before drawing, which can effectively increase the drawing ratio. The main function is to weld the holes in the steel ingot, compact the looseness, and break the non-metallic inclusions. It is one of the most common processes in the free forging process of large forgings, including upsetting of blanks with clamps and upsetting of blanks without clamps.

[0003] At present, large forgings with pliers are used to handle blanks such as Figure 1 As shown in the figure, the traditional upsetting tool used in the upsetting process is as follows Figure 2 or Figure 3 As shown, it includes a cylindrical drain disc body 1, and a through hole 2 is provided in the center of the drain disc body 1 along its axial direction, and the through hole 2 is a cylindrical through hole. The roughening method is: first, as Figure 2 As shown in the figure, the blank 4 is placed on the top surface of the upsetting tool, that is, the bottom end surface 41 of the blank 4 contacts the top surface of the drain plate body 1, and the clamp handle 5 is located in the through hole 2 and is suspended in the air; then, the blank is pressed downward by the press to perform upsetting. During the upsetting process, since the blank 4 is subjected to downward pressure as a whole and the clamp handle 5 is suspended in the air, Figure 3 As shown, the root of the clamp handle 5 will produce an obvious downward metal flow, thereby forming leakage. Utility Model Content

[0004] The utility model aims to provide a roughing tool with a clamp handle for forging forming to reduce roughing leakage.

[0005] The technical solution adopted by the utility model is: a roughing tool for forming forgings with a clamp handle, comprising a cylindrical leak plate body, a through hole penetrating along the axial direction of the leak plate body is arranged at the center of the leak plate body, the through hole is a step hole, and axially comprises a cylindrical hole at the bottom, a tapered hole with a draft angle in the middle, and an annular terrace hole with an inclination at the top; the annular terrace hole gradually retracts inward from the top to the bottom along the axial direction; the diameter of the cylindrical hole is smaller than the bottom diameter of the tapered hole, and a transition plane for suspending a blank is formed between the top end of the cylindrical hole and the bottom end of the tapered hole.

[0006] Furthermore, the draft angle of the tapered hole is α, 3°≤α≤7°, and the angle between the annular table hole and the top plane of the tooling is β, 4°≤β≤6°.

[0007] Furthermore, the diameter of the cylindrical hole is d1, d1 = (0.4-0.6) × d2, and d2 is the bottom diameter of the tapered hole.

[0008] Furthermore, the height of the drain disk body is H, the depth of the cylindrical hole is h, and h=(0.1-0.2)H.

[0009] Furthermore, the connection between the annular terrace hole and the conical hole has a rounded corner transition; the connection between the bottom end surface of the conical hole and the inner wall of the conical hole has a rounded corner transition; and the connection between the bottom end surface of the conical hole and the cylindrical hole has a rounded corner transition.

[0010] Furthermore, a hoisting countersunk hole is arranged on the outer side wall of the drain pan body.

[0011] The beneficial effects of the utility model are as follows: the utility model avoids the tongs from being suspended in the air by setting the through hole as a step hole and using the transition plane between the conical hole and the cylindrical hole as a table support tongs handle, so that the leakage of the bottom of the tongs handle during the upsetting process is greatly reduced, or even eliminated, thereby improving the utilization rate of the steel ingot and achieving the purpose of saving materials. The utility model is applied to the upsetting process of large forgings, and the actual production after improvement proves that the weight of the leakage is reduced by at least 1% of the weight of the steel ingot, which can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the blank with pliers handle.

[0013] Figure 2 This is a schematic diagram of the roughing process before the blank is roughed using the traditional roughing tool with a pair of pliers;

[0014] Figure 3 This is a schematic diagram of the roughening of the blank using the traditional roughening tooling and the pair of pliers;

[0015] Figure 4 It is a schematic diagram of a roughing tool for forming a forging with a clamp handle disclosed in the utility model;

[0016] Figure 5 It is a schematic diagram of a roughing tooling pair of pliers disclosed in the utility model before roughing a blank;

[0017] Figure 6 The utility model is a schematic diagram of a roughing tool with a pair of pliers for roughing a blank.

[0018] In the figure, the drain plate body 1, the through hole 2, the cylindrical hole 21, the conical hole 22, the annular platform hole 23, the transition plane 24, the hanging countersunk hole 3, the blank 4, the bottom end face 41, and the clamp handle 5. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] In the present invention, the terms "upper", "lower", "top", "bottom" and the like indicate positions or location relationships based on the attached Figure 4 or Figure 5 or Figure 6 The orientation or position relationship shown is only for the convenience of describing the present invention, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] Traditional upsetting tools such as Figure 1 or Figure 2 As shown, it includes a cylindrical drain plate body 1, and a through hole 2 is set in the center of the drain plate body 1 along its axial direction, and the through hole 2 is a cylindrical through hole. There is a certain difference between the aperture of the through hole 2 and the diameter of the clamp handle 5, so that the clamp handle 5 can be placed in the through hole 2 when the material is erected. After the upsetting is completed, in order to facilitate the material removal, the clamp handle 5 is often suspended in the through hole 2 of the drain plate body 1 without contacting the bottom. This design of upsetting method leads to obvious material leakage at the root of the clamp handle 5 when the blank 4 is upset.

[0022] The weight of the material leaked from the traditional upsetting tooling is heavy, resulting in a reduction in the utilization rate of the ingot body and a reduction in the amount of ingot nozzle end removal, which not only wastes materials, but also causes the problem of unstable weight of the leaked material affecting the quality of product flaw detection. In addition, if the length of the clamp handle 5 is improperly set, the clamp handle 5 will swell in contact with the bottom surface during the upsetting process, or the through hole 2 of the leak plate body 1 will crack due to long-term use. During the upsetting process, the clamp handle 5 is easy to squeeze into the crack, and the clamp handle 5 will completely fill the tooling through hole 2 and the crack, which can easily cause the workpiece to get stuck in the tooling, increase the demoulding time, and make it impossible for the subsequent process to proceed normally.

[0023] In order to overcome the obvious material leakage defect of the traditional roughing tooling, the utility model improves the traditional roughing tooling to form the following Figure 4 , Figure 5 or Figure 6 The forging forming upset tool with a clamp handle shown in the figure comprises a cylindrical leaking disc body 1, and a through hole 2 is provided in the center of the leaking disc body 1 and penetrates along its axial direction. Different from the traditional through hole, the through hole 2 of the upset tool disclosed in the utility model is a stepped hole, which comprises a cylindrical hole 21 at the bottom, a tapered hole 22 with a draft angle in the middle, and an annular terrace hole 23 with an angle at the top along the axial direction. The annular terrace hole 23 gradually retracts from the top to the bottom along the axial direction; the diameter of the cylindrical hole 21 is smaller than the bottom diameter of the tapered hole 22, and a transition plane 24 is formed between the top of the cylindrical hole 21 and the bottom of the tapered hole 22.

[0024] The through hole 2 is a stepped hole, so that the bottom end face of the clamp handle 5 contacts the transition plane 24 at the bottom of the tapered hole 22 during upsetting, replacing the traditional clamp handle suspended upsetting, thereby preventing the blank at the root of the clamp handle from flowing downward to form leakage, thereby achieving the effect of reducing leakage.

[0025] In order to facilitate the removal of the pliers handle 5 after roughening, the draft angle of the tapered hole 22 is α, 3°≤α≤7°.

[0026] In order to facilitate the workpiece to stand up before upsetting and control the transition surface between the blank and the clamp handle after upsetting to be an inclined surface, the angle β between the annular platform hole 23 and the top plane of the tooling is 4°≤β≤6°.

[0027] The diameter and length of the tapered hole 22 are designed according to the shape of the steel ingot, which is convenient for the operator to clamp. The difference between the diameter of the tapered hole 22 and the diameter of the clamp handle 5 is about 100 mm, so that the clamp handle 5 can quickly and effectively put the material into the tapered hole 22 during upsetting. The length of the clamp handle 5 is determined according to the weight of the clamp handle 5 to fill the tapered hole 22 after upsetting.

[0028] The function of the cylindrical hole 21 at the bottom is to avoid the formation of a completely enclosed space inside the tooling during the upsetting process, which would pose a safety risk, and at the same time facilitate the removal of iron oxide scale or debris.

[0029] The diameter of the cylindrical hole 21 is d1, d1=(0.4-0.6)×d2, and d2 is the bottom diameter of the tapered hole 22.

[0030] In order to further reduce leakage, the height of the leakage disc body 1 is H, and the depth of the cylindrical hole is h, where h=(0.1-0.2)H.

[0031] In order to prevent stress concentration caused by excessive sharpness during the upsetting process, which may lead to the risk of cracking of the blank, the connection between the annular platform hole 23 and the tapered hole 22 is rounded; the connection between the bottom end face of the tapered hole 22 and the inner wall of the tapered hole 22 is rounded; the connection between the bottom end face of the tapered hole 22 and the cylindrical hole 21 is rounded.

[0032] In order to facilitate hoisting, a hoisting countersunk hole 3 is provided on the outer side wall of the drain pan body 1 .

[0033] The upsetting method for forging forming using the upsetting tool with a clamp disclosed in the utility model is as follows:

[0034] Step 1: Use a hoisting device such as a crane to place the forging forming upsetting tool with a clamp disclosed in the utility model on an upsetting platform.

[0035] Step 2: Take out the steel ingot blank 4 with the pre-pressed clamp handle 5 from the heating furnace, turn the blank 4 over so that the clamp handle 5 is facing downward, and put the clamp handle 5 into the tapered hole 22 of the forging forming tool with the clamp handle, and place it on the transition plane 24, that is, Figure 5 or Figure 6 As shown, the bottom end surface of the clamp handle 5 contacts the transition plane 24. Then, the blank 4 is aligned by forging equipment to avoid the problem of the blank 4 being skewed during the upsetting process.

[0036] Step 3, use forging equipment to upset the blank 4. During the upsetting process, the circumference of the bottom of the clamp handle 5 is first bulged. During the bulging process, the outer surface contacts the inner wall of the tapered hole 22 of the upsetting tool with the clamp handle forging, restricting the flow of the bottom metal blank. As the upsetting continues, the contact area between the outer surface of the clamp handle 5 and the inner wall of the tapered hole 22 increases, resisting the downward flow of the blank, thereby reducing leakage.

[0037] Example: The steel ingot used for a certain forging is 240 tons, and the size of the pre-pressing clamp is φ1400mm×1300mm.

[0038] According to the size of the blank with the band clamp, the style and dimensions of each part of the upsetting tool disclosed in the utility model are designed as follows: a cylindrical through hole d1=700mm at the bottom, a tapered hole with a draft angle α=5° in the middle, and a toroidal platform with an angle β=6° at the top. α helps to remove the blank from the tool after the upsetting is completed.

[0039] The bottom diameter d2 of the tapered hole is determined according to the diameter of the pliers handle, d2=1450mm.

[0040] The outer diameter dimension of the roughing tool used for forging with a clamp handle is D = (2.5~3) × d2 = 1450mm × 2.55 = 3700mm.

[0041] The tooling height H = (0.9 ~ 1) × L = 0.967 × 1500mm = 1450, the cylindrical hole depth h = (0.1 ~ 0.2) × H = 0.14 × 1450mm = 200mm.

[0042] The inverted R of the connection between the upper part of the cylindrical hole and the upper and lower parts of the tapered hole are R=50, R=100, and R=150 respectively.

[0043] When the steel ingot blank is upset by the upsetting tooling designed as above, the bottom circumference of the clamp handle 5 is first bulged. During the bulging process, the outer surface of the clamp handle contacts the inner wall of the conical hole of the tooling, restricting the flow of the bottom metal blank. As the upsetting continues, the contact area between the outer surface of the clamp handle 5 and the inner wall of the conical hole increases until the clamp handle material completely fills the conical hole, and the steel ingot blank is deformed again. Since the clamp handle 5 is in full contact with the inner wall of the conical hole, the force of the ingot body to expand and deform downward during upsetting is supported, so that the ingot body blank no longer flows to the clamp handle, thereby achieving the purpose of controlling the shape of the blank and reducing leakage during upsetting. After upsetting is completed, the conical hole has a draft angle, which facilitates the removal of the blank. It is observed that the leakage at the root of the clamp handle is almost zero, achieving the purpose of reducing leakage during upsetting.

[0044] Comparative example: The ingot shape of the steel ingot is 240 tons, and the size of the pre-pressing clamp is φ1400mm×1300mm. The traditional upsetting plate with an inner hole diameter of φ1520mm is used for upsetting. The upsetting length is about 300mm, and the weight of the upsetting is about 4.27 tons, accounting for 1.8% of the weight of the steel ingot.

Claims

1. A roughing tool for forging with a clamp handle, comprising a cylindrical drain plate body (1), a through hole (2) penetrating the drain plate body (1) along its axial direction is provided at the center of the drain plate body (1), characterized in that: The through hole (2) is a stepped hole, which includes a cylindrical hole (21) at the bottom, a tapered hole (22) with a draft angle in the middle, and an annular terrace hole (23) with an angle at the top along the axial direction; The annular terrace hole (23) gradually retracts inward from the top to the bottom along the axial direction; the diameter of the cylindrical hole (21) is smaller than the bottom diameter of the conical hole (22); a transition plane (24) for suspending the blank (4) is formed between the top end of the cylindrical hole (21) and the bottom end of the conical hole (22).

2. The upset tool for forging with a clamp handle as claimed in claim 1, characterized in that: The draft angle of the tapered hole (22) is α, 3°≤α≤7°, and the angle between the annular table hole (23) and the top plane of the tooling is β, 4°≤β≤6°.

3. The upsetting tool for forging forming with a clamp handle as claimed in claim 1 or 2, characterized in that: The diameter of the cylindrical hole (21) is d1, d1=(0.4-0.6)×d2, and d2 is the bottom diameter of the tapered hole (22).

4. The upsetting tool for forging forming with a clamp handle as claimed in claim 1 or 2, characterized in that: The height of the drain disc body (1) is H, and the depth of the cylindrical hole is h, where h=(0.1-0.2)H.

5. The upsetting tool for forging forming with a clamp handle as claimed in claim 1 or 2, characterized in that: The connection between the annular terrace hole (23) and the conical hole (22) is rounded; the connection between the bottom end surface of the conical hole (22) and the inner wall of the conical hole (22) is rounded; and the connection between the bottom end surface of the conical hole (22) and the cylindrical hole (21) is rounded.

6. The upsetting tool for forging with a clamp handle as claimed in claim 1 or 2, characterized in that: A hanging countersunk hole (3) is provided on the outer side wall of the drain pan body (1).

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