Extrusion die for cylindrical forged steel inside and outside reducing closing-up piece

Abstract

The utility model relates to an extrusion die for a cylindrical forged steel inside and outside reducing closing-in piece. The die comprises a lower cushion block, a lower die, a lower punch, an upper punch and an upper die, an upper die inner hole is arranged in the upper die, the upper end of the upper punch is arranged in the upper die inner hole, the lower end of the upper punch is fixedly connected with the upper end of the lower punch, a lower die inner hole is arranged in the lower die, the lower end of the lower punch can be embedded in the lower die inner hole, and the lower cushion block is arranged at the bottom of the lower die inner hole. According to the utility model, the technical problems of low production efficiency, uncontrollable inner wall quality, poor concentricity, high production labor intensity and the like of the inner and outer diameter change of the cylindrical forged steel in the background technology are solved, and the yield and the working efficiency are improved.

Description

Technical Field

[0001] This utility model belongs to the field of hot extrusion tooling technology for cylindrical forged steel end caps, and particularly relates to an extrusion die for cylindrical forged steel end caps with inner and outer diameter variations. Background Technology

[0002] The cylindrical forged steel end-capped part is produced by hot extrusion to narrow the inner and outer diameters. It is made from a cylindrical billet of Φ140×Φ104×620 mm, which is locally heated and then extruded. The forging is as follows: Figure 1 As shown. Previously, a simple mold structure was used to form the material on a free forging hammer, such as... Figure 2 As shown. The working steps of this structure are as follows:

[0003] 1) Heat one end using induction heating, with an effective area of ​​approximately 100mm;

[0004] 2) Place the billet into the lower die and strike the billet with the free forging hammer until the lower end face of the billet is flush with the lower end face of the die.

[0005] 3) Reheat the billet;

[0006] 4) Place the formed end of the blank into the lower mold and the punch, and strike the upper surface of the punch until the upper surface of the blank is flush with the upper surface of the blank.

[0007] 5) Flip the mold 180° and punch out the blank and punch in sequence.

[0008] This structure has many drawbacks:

[0009] 1) Poor concentricity of forgings: Due to the low height of the lower die and insufficient length of the hot billet introduction section, the lower outer circle of Φ140 is prone to upsetting and outward expansion when the billet enters the lower die, resulting in scrap.

[0010] 2) Since the inner wall is in a free state after the first closing, the inner diameter will fold when the punch is placed for the second time.

[0011] 3) It is difficult to judge whether the blank filling is in place. It is necessary to lift the lower mold multiple times to observe the bottom of the mold.

[0012] 4) Secondary heating is required.

[0013] 5) Releasing or dropping the punch involves high labor intensity and poses significant safety risks. Utility Model Content

[0014] This utility model addresses the technical problems in the prior art, such as low production efficiency, uncontrollable inner wall quality, poor concentricity, and high labor intensity in the production of cylindrical forged steel with internal and external diameter variations. It provides an extrusion die for cylindrical forged steel with internal and external diameter variations to improve yield and work efficiency.

[0015] The technical solution of this utility model is as follows: This utility model is an extrusion die for a cylindrical forged steel inner and outer diameter variable tapering part. Its special feature is that the extrusion die for the cylindrical forged steel inner and outer diameter variable tapering part includes a lower pad block, a lower die, a lower punch, an upper punch, and an upper die. The upper die is provided with an upper die inner hole. The upper end of the upper punch is set in the upper die inner hole. The lower end of the upper punch is fixedly connected to the upper end of the lower punch. The lower die is provided with a lower die inner hole. The lower end of the lower punch can be embedded in the lower die inner hole. The bottom of the lower die inner hole is provided with a lower pad block.

[0016] Furthermore, the extrusion die for cylindrical forged steel inner and outer diameter reducing parts also includes a demolding device, which includes a lower pad, a movable pad block, and a material ejection ring. The movable pad block is located in the middle of the lower pad, the lower pad is located above the lower die, and the material ejection ring is located below the upper punch.

[0017] Furthermore, the ejector ring is a two-part mold structure.

[0018] Furthermore, the lower pad, movable pad, and ejector ring are made of 45 steel.

[0019] Furthermore, an annular boss is provided in the lower part of the inner hole of the upper die, and an annular flange is provided on the top of the upper punch. The upper punch is suspended on the annular boss through the annular flange.

[0020] Furthermore, a countersunk hole for an internal hexagon screw is provided at the center of the upper end face of the lower punch, and a threaded blind hole is provided at the center of the lower end face of the upper punch. The lower punch and the upper punch are fastened together by an internal hexagon screw.

[0021] Furthermore, the materials for the lower pad, lower die, lower punch, upper punch, and upper die are hot work die steel H13.

[0022] The extrusion die for a cylindrical forged steel inner and outer diameter variable tapering part provided by this utility model has the following beneficial effects:

[0023] 1) This utility model is simple to operate and the size and shape of the forgings are guaranteed.

[0024] 2) The lower punch and upper punch of this utility model adopt a separate structure, and the worn parts of the lower punch are easy to replace.

[0025] 3) This utility model is equipped with a demolding device, which can demold smoothly, reduce the number of heating times, reduce the pulling intensity of operators, improve the yield, and can significantly reduce costs and improve economic benefits. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a forging.

[0027] Figure 2 This is a schematic diagram of the mold structure before the improvement.

[0028] Figure 3This is a schematic diagram of the structure of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of this utility model before pressing;

[0030] Figure 5 This is a schematic diagram of the structure of the present invention after pressing;

[0031] Figure 6 This is a schematic diagram of the structure of this utility model after material removal.

[0032] The attached figures are labeled as follows:

[0033] 01. Lower pad; 02. Lower die; 03. Lower punch; 04. Upper punch; 05. Upper die; 06. Lower pad plate; 07. Movable pad; 08. Material ejection ring. Detailed Implementation

[0034] The overall scheme of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0035] See Figure 3 The structure of this utility model embodiment includes: a lower pad block 01, a lower die 02, a lower punch 03, an upper punch 04, and an upper die 05. The upper die 05 has an inner hole, and the upper end of the upper punch 04 is positioned within this inner hole. The lower end of the upper punch 04 is fixedly connected to the upper end of the lower punch 03. The lower die 02 has an inner hole, and the lower end of the lower punch 03 can be embedded within it. A lower pad block 01 is located at the bottom of the lower die inner hole. An annular boss is located at the lower part of the upper die inner hole, and an annular flange is located at the top of the upper punch 04. The upper punch 04 is suspended from the annular boss via the annular flange. A countersunk hole for a hexagonal screw is located at the center of the upper end face of the lower punch 03, and a threaded blind hole is located at the center of the lower end face of the upper punch 04. The lower punch 03 and the upper punch 04 are fixedly connected by hexagonal screws. The materials of the lower pad block 01, lower die 02, lower punch 03, upper punch 04 and upper die 05 are hot work die steel H13.

[0036] This utility model also includes a demolding device, which comprises a lower pad 06, a movable pad 07, and a ejector ring. The movable pad is located in the middle of the lower pad, which is positioned above the lower die. The ejector ring is located below the upper punch 08. The ejector ring 08 has a two-half die structure for easy placement and removal. The lower pad 06, the movable pad 07, and the ejector ring are all made of 45 steel.

[0037] The specific implementation method of this utility model is as follows:

[0038] 1) Improved assembly drawing:

[0039] See Figure 3The improved mold of this utility model is mainly composed of 8 parts: lower pad block 01, lower mold 02, lower punch 03, upper punch 04, upper mold 05, lower pad plate 06, movable pad block 07, and ejector ring 08.

[0040] 2) Fabrication of lower pad block 01, lower mold 02, lower punch 03, upper punch 04, and upper mold 05:

[0041] The lower pad 01, lower die 02, lower punch 03, upper punch 04, and upper die 05 are made of hot-work die steel H13 and are rough and finish machined on a lathe. The lower end face of the lower die 02 and the upper end face of the upper die 05 are machined with 4-M24 threaded blind holes for connection to the upper and lower templates. The lower punch 03 has a countersunk hole for an internal hexagonal screw machined in its center, and the lower end face of the upper punch 04 has an M24 threaded blind hole machined in its center. The lower punch 03 and the upper punch 04 are connected using M24 internal hexagonal screws.

[0042] 3) Fabrication of lower pad 06, movable pad 07, and ejector ring 08:

[0043] The lower pad 06, movable pad 07, and ejector ring 08 are made of 45 steel and are rough and precision machined on a lathe. The ejector ring 08 is a two-part mold for easy placement and removal.

[0044] 4) The working steps of this utility model are as follows:

[0045] 4.1) See Figure 4 The heated part of the billet with one end heated is placed into the lower die 02. The upper crossbeam of the hydraulic press moves downward, driving the upper die 05, upper punch 04, and lower punch 03 downward. When the upper die 05 contacts the upper end face of the billet, the lower end face of the lower punch 03 contacts the lower pad block 01.

[0046] 4.2) See Figure 5 The upper beam of the hydraulic press continues to descend, driving the upper die 05 downward, extruding and deforming the heated part of the billet, and the forging of the billet is completed.

[0047] 4.3) See Figure 6 The upper beam of the hydraulic press moves upward, driving the upper die 05, upper punch 04, and lower punch 03 upward. If the blank sticks to the punch, a lower pad 06 and a movable pad 07 are placed on the lower die 02, and a ejector ring 08 (the ejector ring 08 is a two-part die structure) is placed on the upper end face of the blank close to the punch. The upper beam of the hydraulic press moves downward, driving the upper die 05 and the blank downward. Because the movable pad 07 supports the lower punch 03 and the upper punch 04, the blank is demolded from the lower punch 03. The upper beam of the hydraulic press moves upward, driving the upper die 05, upper punch 04, and lower punch 03 upward, and the ejector ring 08, forging blank, movable pad 07, and lower pad 06 are removed in sequence. If the blank sticks to the lower die 02, the ejector cylinder ejects the ejector rod, which pushes the lower pad 01 upward to remove the blank.

[0048] The content of this utility model and the technical content not specifically described in the above embodiments are the same as the prior art.

[0049] The above are merely specific embodiments disclosed in this utility model, but the scope of protection disclosed in this utility model is not limited thereto. The scope of protection disclosed in this utility model shall be determined by the scope of protection of the claims.

Claims

1. A cylindrical forged steel inner and outer diameter tapering extrusion die, characterized in that: The extrusion die for the cylindrical forged steel inner and outer diameter reducing part includes a lower pad block, a lower die, a lower punch, an upper punch, and an upper die. The upper die has an inner hole, the upper end of the upper punch is set in the inner hole, and the lower end of the upper punch is fixedly connected to the upper end of the lower punch. The lower die has an inner hole, and the lower end of the lower punch can be embedded in the inner hole. The bottom of the inner hole of the lower die has a lower pad block.

2. The extrusion die for a cylindrical forged steel inner and outer diameter variable tapering part according to claim 1, characterized in that: The extrusion die for the cylindrical forged steel inner and outer diameter reducing part also includes a demolding device, which includes a lower pad, a movable pad block and a material ejection ring. The movable pad block is located in the middle of the lower pad, the lower pad is located above the lower die, and the material ejection ring is located below the upper punch.

3. The extrusion die for a cylindrical forged steel inner and outer diameter reducing part according to claim 2, characterized in that: The ejector ring is a two-part mold structure.

4. The extrusion die for a cylindrical forged steel inner and outer diameter reducing part according to claim 3, characterized in that: The lower pad, movable pad, and ejector ring are made of 45 steel.

5. The extrusion die for a cylindrical forged steel inner and outer diameter tapering part according to any one of claims 1 to 4, characterized in that: An annular boss is provided in the lower part of the inner hole of the upper die, and an annular flange is provided on the top of the upper punch. The upper punch is suspended on the annular boss through the annular flange.

6. The extrusion die for a cylindrical forged steel inner and outer diameter reducing part according to claim 5, characterized in that: The lower punch has a countersunk hole for an internal hexagon screw at the center of its upper end face, and the upper punch has a threaded blind hole at the center of its lower end face. The lower punch and the upper punch are fastened together by an internal hexagon screw.

7. The extrusion die for a cylindrical forged steel inner and outer diameter reducing part according to claim 6, characterized in that: The lower pad, lower die, lower punch, upper punch, and upper die are made of hot work die steel H13.

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