Local heating tool suitable for long-shaft forge piece

Abstract

The utility model belongs to the technical field of forging, and particularly relates to a local heating tool suitable for a long-shaft forge piece. Comprising a lower heating tool and an upper heating tool, the lower heating tool comprises a first steel skeleton and a plurality of steel fiber refractory material blocks, the first steel skeleton comprises a rectangular frame made of steel plates and steel baffles, a rectangular inner cavity is divided into a plurality of grids by the steel baffles, and the steel fiber refractory material blocks are arranged in the grids; the upper heating tool comprises a second steel framework and a steel fiber refractory material part, a plurality of U-shaped grooves are formed in the upper end face of the steel fiber refractory material part, the second steel framework comprises a bottom face, a left side face and a right side face, and the left side face, the right side face and the bottom face are all provided with turned-over edges; and the vertical distance from the bottom of the U-shaped groove to the bottom of the upper heating tool is equal to the radius difference between the rough large head and the rod part of the height lengthening shaft forge piece of the furnace bottom plate.

Description

Technical Field

[0001] The utility model belongs to the technical field of forging, and particularly relates to a local heating tooling applicable to long shaft forgings. Background Art

[0002] The long shaft forging with a flange is one of the key components of an aeroengine. Since the diameter difference between the flange part and the rod part of this type of forging is relatively large, the conventional forging method is to rough and stretch the rod part first, and then perform die forging to upset and thicken the large head part to form the flange part. In the die forging process, in order not to upset the rod part again, it is often necessary to locally heat the rough large head part. The traditional heating method is to place the rough large head part in the heating furnace, place the non-deformed rod part outside the heating furnace, and pad it with refractory bricks. The gap between the furnace door and the bar stock is filled with heat-insulating cotton. This heating method has the disadvantages of complex operation process, poor heat preservation effect, and great potential safety hazards, and is not suitable for mass production of products. Content of the Utility Model

[0003] The purpose of the utility model is to provide a local heating tooling applicable to long shaft forgings, which solves the disadvantages of complex operation process, poor heat preservation effect, and great potential safety hazards existing in the local heating of traditional long shaft forgings during roughing, and is simple to manufacture and has popularization value.

[0004] Technical Solution:

[0005] A local heating tooling applicable to long shaft forgings is used for the local heating process of long shaft forgings with flanges, and includes: a lower heating tooling 1 and an upper heating tooling 2, and the upper heating tooling 2 is stacked on the lower heating tooling 1 for use;

[0006] Among them, the lower heating tooling 1 includes a first steel skeleton 11 and a plurality of steel fiber refractory material blocks 12. The first steel skeleton 11 includes a rectangular frame made of steel plates and steel baffles. The steel baffles divide the rectangular inner cavity into several squares. The steel fiber refractory material blocks 12 are arranged in the squares. Flanges are provided on both the rectangular frame and the steel baffles for fixing the steel fiber refractory material blocks 12. The length of the lower heating tooling 1 is 100 mm smaller than the width of the furnace door, the height is consistent with the drop from the bottom of the furnace chamber to the bottom of the furnace door opening, and the width is smaller than the extension length of the furnace door opening;

[0007] The upper heating tooling 2 includes a second steel skeleton 21 and a steel fiber refractory piece 22. Multiple U-shaped grooves are provided on the upper end surface of the steel fiber refractory piece 22. The second steel skeleton 21 includes a bottom surface and two left and right side surfaces. Among them, flanges are provided on both the left and right side surfaces and the bottom surface for fixing the steel fiber refractory piece 22. The bottom surface of the steel fiber refractory piece 22 and the two left and right side surfaces of the steel fiber refractory piece 22 are wrapped by the second steel skeleton 21. The radius of the arc section of the U-shaped groove is larger than the rod part of the rough shape of the long-axis forging. The straight section of the U-shaped groove is a parallel line extended from the tangent of the bottom semi-circle, and the height of the straight section of the U-shaped groove is equal to the radius of the arc section. The vertical distance from the bottom of the U-shaped groove to the bottom of the upper heating tooling 2 is equal to the height of the furnace bottom plate plus the radius difference between the large head and the rod part of the rough shape of the long-axis forging.

[0008] Further, the radius of the arc section of the U-shaped groove is 5 mm larger than the rod part of the rough shape of the long-axis forging.

[0009] Further, the distance between each U-shaped groove is 50 - 100 mm larger than the diameter difference between the large head and the rod part of the rough shape.

[0010] Further, the thickness of the steel plates forming the first steel skeleton 11 and the second steel skeleton 21 is 10 - 15 mm.

[0011] Further, heat insulation cotton with a thickness of 10 - 15 mm is pasted on the inner and outer surfaces formed by the length and height of the upper heating tooling 2 with an adhesive.

[0012] Further, two rectangular through-grooves (24) are provided at the bottom of the upper heating tooling 2, and the width and height of the through-groove 24 match the forks of the forklift.

[0013] Beneficial effects:

[0014] The utility model is applicable to the heating process of the rough shape of the long-axis forging. After using this tooling, firstly, the furnace loading process is simple and safe. Secondly, after using this tooling, the sealing performance at the heating furnace door is good, ensuring the quality of the long-axis forging. Thirdly, this heating tooling is simple to manufacture, low in cost, reusable, and has promotional value. Description of the drawings

[0015] Figure 1 is the three-dimensional view of the lower heating tooling;

[0016] Figure 2 is the three-dimensional view of the upper heating tooling;

[0017] Figure 3 is the cross-sectional view of the upper heating tooling;

[0018] Among them, 11 is the first steel skeleton, 12 is the steel fiber refractory block, 21 is the second steel skeleton, 22 is the steel fiber refractory piece, 23 is the heat insulation cotton, and 24 is the through-groove. Detailed implementation mode

[0019] For a long shaft forging with a flange, the traditional heating method is that the rough-shaped deformation part is placed inside the heating furnace, the non-deformed part is placed outside the heating furnace and padded with refractory bricks, and the gap between the furnace door and the bar stock is filled with heat-insulating cotton. This method has the disadvantages of complex operation process, poor heat preservation effect and great potential safety hazards. The utility model designs a local heating tooling, which consists of two parts, namely a lower heating tooling 1 and an upper heating tooling 2; its external dimensions match the dimensions of the furnace door opening. A plurality of uniformly distributed U-shaped grooves are arranged on the heating tooling 2. During local heating, the rough-shaped rod part is placed on the U-shaped grooves, the large-head deformation part is placed inside the heating furnace, and then after laying heat-insulating cotton on the heating tooling 2 and lowering the furnace door, heating can be started. This tooling solves the disadvantages of the traditional furnace loading method, is simple to manufacture, and has the value of popularization.

[0020] The utility model designs a local heating tooling suitable for long shaft forgings, which solves the disadvantages of complex operation process, poor heat preservation effect and great potential safety hazards existing in the local heating of traditional long shaft forgings. The heating tooling includes: a lower heating tooling 1 and an upper heating tooling 2, as Figure 1 、 Figure 2 shown, the internal structure distribution of the upper heating tooling 2 is as Figure 3 shown.

[0021] The lower heating tooling 1 is placed at the furnace door opening of the heating furnace. Its length is 100 mm smaller than the width of the furnace door, its height is the same as the drop from the bottom of the furnace chamber to the bottom of the furnace door opening, and its width is smaller than the extended length of the furnace door opening. Considering factors such as the length of the exposed part of the rod during the heating of the long shaft forging and the strength of the tooling, its width is designed to be 400 mm. The lower heating tooling can be used to level the drop from the furnace door opening to the bottom of the furnace chamber, that is, after the lower heating tooling is placed at the furnace door opening, its upper plane is flush with the furnace chamber;

[0022] The upper heating tooling 2 is stacked on the lower heating tooling 1 to pad up the rough-shaped rod part of the long shaft forging. Its external length and width are the same as those of the lower heating tooling 1. A plurality of uniformly distributed U-shaped grooves are arranged on this tooling. The radius of the arc section is 5 mm larger than the rough-shaped rod part of the long shaft forging. Its straight section is a parallel line extended from the tangent of the bottom semi-circle, and the height of this straight section is equal to the radius of the arc section. The vertical distance from the bottom of the U-shaped groove to the bottom of the upper heating tooling is equal to the height of the furnace bottom plate plus the radius difference between the large head and the rod of the rough-shaped long shaft forging. The distance between each U-shaped groove is 50 - 100 mm larger than the diameter difference between the large head and the rod of the rough-shaped part.

[0023] The lower heating tooling 1 is composed of a first steel framework 11 and steel fiber refractory material blocks 12. The manufacturing process is as follows: First, a rectangular inner cavity is made of steel plates, with its length and width being the same as those of the lower heating tooling. At the upper and lower end faces of the rectangular inner cavity, the steel plates extend inwards by 30 - 50 mm. Then, the rectangular inner cavity is partitioned into several grids by steel plates to form the first steel framework 11 of the lower heating tooling. The steel plates are all connected by welding, and the length of the grids is the same as the width of the steel framework. Finally, the steel framework is filled with steel fiber heat-resistant material 12 to make the lower heating tooling 1.

[0024] The upper heating tooling 2 is composed of a second steel framework 21 and steel fiber refractory material parts 22. The steel fiber refractory material parts 22 are made into the required shape in a special mold and then reinforced with the second steel framework 21.

[0025] The thickness of the steel plate for making the steel framework is 10 - 15 mm.

[0026] On the inner and outer surfaces formed by the length and height of the upper heating tooling 2, heat-insulating cotton with a thickness of 10 - 15 mm is pasted with an adhesive.

[0027] Two rectangular through-grooves 24 are provided at the bottom of the upper heating tooling 2, and the width and height of the through-grooves 24 are matched with the forks of the forklift.

[0028] In this example, taking the long-axis forging of GH4169 as an example, the specific implementation process is as follows:

[0029] Step 1: Use a forklift to place the lower heating tooling 1 on the extended platform at the furnace door, and then stack the upper heating tooling 2 on the lower heating tooling 1 with the forklift.

[0030] Step 2: Place the rough shape of the long-axis forging so that its large head is placed within the qualified area of the heating furnace, and the rod part passes through the U-shaped groove 24 and extends outside the furnace door.

[0031] Step 3: Use heat-insulating cotton to fill the gap between the rough shape rod part and the U-shaped groove 24. After covering a layer of heat-insulating cotton on the upper end face of the upper heating tooling 2, lower the furnace door and press the upper heating tooling 2.

[0032] Step 4: Start heating. The specific heating regime is as follows: Enter the furnace at ≤750 °C, hold at 850 °C for 195 min, then raise the temperature to 1000 °C and hold for 150 min.

[0033] Step 5: Take the rough shape out of the furnace, place it in the die, and upset the large head of the rough shape to make the required long-axis forging with a flange.

Claims

1. A local heating tool suitable for long shaft forgings, used for the local heating process of long shaft forgings with flanges, characterized in that: include: A lower heating tool (1) and an upper heating tool (2), wherein the upper heating tool (2) is stacked on the lower heating tool (1) for use; The lower heating tool (1) comprises a first steel frame (11) and a plurality of steel fiber refractory blocks (12). The first steel frame (11) comprises a rectangular frame made of steel plates and a steel baffle. The steel baffle divides the rectangular inner cavity into a plurality of squares. The steel fiber refractory blocks (12) are arranged in the squares. Both the rectangular frame and the steel baffle are provided with flanges for fixing the steel fiber refractory blocks (12). The length of the lower heating tool (1) is 100 mm smaller than the width of the furnace door. The height is consistent with the drop from the bottom of the furnace to the bottom of the furnace door. The width is smaller than the extension length of the furnace door. The upper heating tool (2) comprises a second steel frame (21) and a steel fiber refractory material piece (22), wherein the upper end surface of the steel fiber refractory material piece (22) is provided with a plurality of U-shaped grooves, and the second steel frame (21) comprises a bottom surface and two left and right side surfaces, wherein the left and right side surfaces and the bottom surface are provided with flanges for fixing the steel fiber refractory material piece (22), and the bottom surface of the steel fiber refractory material piece (22) and the left and right side surfaces of the steel fiber refractory material piece (22) are wrapped by the second steel frame (21), the arc segment radius of the U-shaped groove is larger than the rough-shaped rod portion of the long shaft forging, the straight line segment of the U-shaped groove is a parallel line extending from the tangent of the bottom semicircle, the height of the straight line segment of the U-shaped groove is equal to the arc segment radius, and the vertical distance between the bottom of the U-shaped groove and the bottom of the upper heating tool (2) is equal to the height of the furnace bottom plate plus the radius difference between the rough-shaped large head portion of the long shaft forging and the rod portion.

2. The local heating tool according to claim 1, characterized in that: The radius of the arc section of the U-shaped groove is 5 mm larger than the rough-shaped rod portion of the long shaft forging.

3. The local heating tool according to claim 2, characterized in that: The spacing between the U-shaped grooves is 50 to 100 mm greater than the diameter difference between the rough-shaped large head and the rod.

4. The local heating tool according to claim 3, characterized in that: The thickness of the steel plates used to make the first steel frame (11) and the second steel frame (21) is 10 to 15 mm.

5. The local heating tool according to claim 4, characterized in that: The inner and outer surfaces of the upper heating tooling (2) consisting of the length and height are pasted with 10-15mm thick heat-insulating cotton by adhesive.

6. The local heating tool according to claim 1, characterized in that: Two rectangular through grooves (24) are arranged at the bottom of the upper heating tool (2), and the width and height of the through grooves (24) match the forks of the forklift.

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