Sizing block for forge piece heat treatment furnace

Abstract

The sizing block for the forge piece heat treatment furnace comprises a base, a strip-shaped groove is formed in the upper surface of the base, an insert is movably arranged in the strip-shaped groove, a plurality of through holes are formed in the two side faces of the base, a plurality of grooves are formed in the two side faces of the strip-shaped groove, the through holes correspond to the grooves, and the insert is movably arranged in the strip-shaped groove. The number of the grooves is at least two rows, supporting rods are movably arranged in the through holes, one ends of the supporting rods penetrate through the through holes, and the other ends of the supporting rods are arranged in the grooves. The sizing block adopts a combined mode, the base is made of heat-resistant steel or low-carbon steel, and the cost is mainly controlled; the middle insert is made of nickel-based superalloy and other materials to carry out a gas furnace high-temperature empty burning contrast test so as to select a proper insert, and when the insert or the base is damaged, the insert or the base can be independently replaced, so that the purposes of convenient maintenance and cost reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, in particular to a pad iron used in a forging heat treatment furnace. Background Art

[0002] Aviation forgings are sensitive to heating temperature and require high furnace temperature uniformity. Natural gas heating furnaces or electric heating furnaces are generally used. Compared with electric heating furnaces, natural gas heating furnaces have the characteristics of high heating efficiency, fast heating, low energy consumption, and stable use in the 1200℃ high temperature zone. In the heating furnace, the effective working area of ​​the furnace is smaller than the furnace size. This is because the temperature near the furnace is uneven and it is difficult to meet the process requirements. Therefore, the effective heating area is smaller than the actual size of the furnace. Generally, the left and right sides of the natural gas heating furnace are 400~1100mm, and the upper and lower and front and rear ends are 200~600mm as the non-effective area.

[0003] During the heating process of forgings, in order to ensure that the workpiece is heated in the effective area of ​​the furnace, it is necessary to raise the workpiece during heating. The raising tooling generally uses refractory bricks or pads. However, since the highest temperature during heat treatment reaches 900℃-1000℃, the pads are severely oxidized under long-term high temperature, and are easily deformed due to the heavy pressure of the heat-treated products. The service life is short (≤1 year), and the entire pad cost is high, which makes the forging heat treatment maintenance cost very high. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a shim for a forging heat treatment furnace. Through the combined shim, when an insert on the shim is damaged, the insert or the base can be replaced, thereby reducing the maintenance cost.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A pad iron for a forging heat treatment furnace comprises a base, the upper surface of the base is provided with a strip groove, an insert is movably arranged in the strip groove, both sides of the base are provided with a plurality of through holes, both sides of the strip groove are provided with a plurality of grooves, the through holes correspond to the grooves, the grooves are arranged in at least two rows, a support rod is movably arranged in the through hole, one end of the support rod passes through the through hole, and the other end is arranged in the groove.

[0007] There is a gap between the outer side wall of the insert and the inner side wall of the strip groove, and the gap is ≥5mm.

[0008] Both side surfaces of the base are connected with inclined blocks, and there are multiple inclined blocks that are evenly distributed.

[0009] Both end surfaces of the base are connected with hanging blocks, and the bottom surface of the hanging blocks is 20-30 mm away from the bottom surface of the base.

[0010] The upper corners of both sides of the base are arranged as inclined surfaces, and the angle of the inclined surfaces is 45-60 degrees.

[0011] The two ends of the strip groove penetrate through the two end surfaces of the base.

[0012] The width of the base is 0.9-1.2 times the height of the base.

[0013] The beneficial effects of the utility model are:

[0014] 1. The shim adopts a combination mode, and the base is made of heat-resistant steel or low-carbon steel, with cost control as the main focus; the middle insert is made of nickel-based high-temperature alloy and other materials to conduct a high-temperature empty burning comparison test in a gas furnace to select a suitable insert. When the insert or the base is damaged, the insert or the base can be replaced separately, thereby achieving convenient maintenance and reducing costs.

[0015] 2. Multiple rows of grooves are arranged on both sides of the insert to facilitate the adjustment of the height of the insert, so that it can be used for forgings of different heights and shapes, preventing the bottom of the forging from contacting the base, thereby allowing the forging to be more fully heat treated in the gas furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the cross section of the middle BB;

[0018] Figure 3 It is a schematic diagram of the structure in which the insert is fixed to the groove in the upper row;

[0019] Figure 4 is a schematic diagram of the structure of the base;

[0020] Figure 5 for Figure 1 Front view of .

[0021] As shown in the figure: 1-base, 2-strip groove, 3-inlay, 4-through hole, 5-groove, 6-support rod, 7-inclined block, 8-lifting block, 9-inclined surface. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Example 1

[0024] like Figures 1 to 5As shown, a pad iron for a forging heat treatment furnace includes a base 1, the upper surface of the base 1 is provided with a strip groove 2, an insert 3 is movably arranged in the strip groove 2, a plurality of through holes 4 are arranged on both sides of the base 1, a plurality of grooves 5 are arranged on both sides of the strip groove 2, the through holes 4 correspond to the grooves 5, the grooves 5 are at least two rows, a support rod 6 is movably arranged in the through hole 4, one end of the support rod 6 passes through the through hole 4, and the other end is arranged in the groove 5.

[0025] There is a gap between the outer wall of the insert 3 and the inner wall of the strip groove 2, and the gap is ≥5 mm.

[0026] Both side surfaces of the base 1 are connected with inclined blocks 7 . There are multiple inclined blocks 7 , which are evenly distributed. The inclined blocks 7 increase the stability of the base 1 .

[0027] Both end surfaces of the base 1 are connected with hanging blocks 8 , and the bottom surface of the hanging blocks 8 is 20-30 mm away from the bottom surface of the base 1 .

[0028] The upper corners of both sides of the base 1 are arranged as inclined surfaces, and the angle of the inclined surfaces is 45-60 degrees.

[0029] The two ends of the strip groove 2 pass through the two end surfaces of the base 1 .

[0030] The width of the base 1 is 0.9-1.2 times the height of the base 1 .

[0031] Hang the insert 3 into the strip groove 2, align the through hole 4 with the groove 5 (if it is a forging with a higher special-shaped structure, align the groove 5 in a certain row on the upper side with the through hole 4 accordingly), pass the support rod 6 through the through hole 4, and insert the inner end of the support rod 6 into the groove 5, so as to fix the insert 3 on the base 1.

[0032] The base 1 is made of heat-resistant steel, and the insert 2 is made of GH4169 and GH4698 alloy materials. They are heated in the furnace for 48 hours. By comparison, the GH4698 alloy is more resistant to high-temperature heating in a gas furnace. The GH4169 alloy will have a thinner oxide layer, while the GH4698 alloy will not have an oxide layer. Therefore, the GH4698 alloy is used as the intermediate insert.

[0033] Take a natural gas heating furnace as an example, where the effective heating area of ​​the furnace is 2000mm wide and the lower end is 300mm as the ineffective area.

[0034] 1. The pad iron adopts a combination mode, and the base 1 is made of heat-resistant steel or low-carbon steel, mainly for cost control; the middle insert is made of nickel-based high-temperature alloy and other materials to carry out high-temperature empty burning comparison tests in gas furnaces to select suitable inserts.

[0035] 2. The length of the base 1 of the combined pad can be divided into 2 to 4 according to the width of the effective heating zone of the heating furnace. If it is too short, the weight is light and it is not conducive to the stable placement of the forgings. The height of the base needs to be ≥300mm to ensure that the forgings are in the effective heating zone of the furnace. The width of the base is equal to 0.9 to 1.2 times the height of the base. If it is too narrow, it is not conducive to the stability of the base. If it is too wide, special-shaped forgings are easy to hit the base. The width of the groove 5 is 100 to 120mm, and the depth is 80 to 100mm. The groove 5 runs through the base 1; the width of the two side walls of the groove 5 is 45 to 65mm, and the outer side needs to be chamfered 45 to 60° to prevent special-shaped forgings from hitting the base; the single-sided gap between the insert 3 and the base 1 is ≤5mm. After the insert 3 is placed on the base 1, the single side of the insert 3 is 0 to 50mm shorter than the base.

[0036] By arranging multiple rows of grooves 5 on both sides of the insert 3, the height of the insert 3 can be adjusted to facilitate forgings of different heights and prevent the bottom of the forging from contacting the base, thereby allowing the forging to be more fully heat treated in the gas furnace.

[0037] First, the base 1 is manufactured, and then the middle insert 3 is manufactured. After assembling, they can be put into the gas furnace for use. Attachment 1 shows the use of the combined pad iron in the gas furnace. The load-bearing capacity is good. After heating, the base is severely oxidized, but the middle insert is basically not oxidized, which can meet the heating requirements of the forgings.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pad for a forging heat treatment furnace, comprising a base (1), characterized in that: The upper surface of the base (1) is provided with a strip groove (2), an insert (3) is movably arranged in the strip groove (2), a plurality of through holes (4) are arranged on both sides of the base (1), a plurality of grooves (5) are arranged on both sides of the strip groove (2), the through holes (4) correspond to the grooves (5), the grooves (5) are arranged in at least two rows, a support rod (6) is movably arranged in the through hole (4), one end of the support rod (6) passes through the through hole (4), and the other end is arranged in the groove (5).

2. A pad iron for a forging heat treatment furnace as claimed in claim 1, characterized in that: There is a gap between the outer wall of the insert (3) and the inner wall of the strip-shaped groove (2), and the gap is ≥5 mm.

3. A pad iron for a forging heat treatment furnace as claimed in claim 1, characterized in that: Both side surfaces of the base (1) are connected with inclined blocks (7), and there are a plurality of inclined blocks (7) which are evenly distributed.

4. A shim for a forging heat treatment furnace as claimed in claim 1, characterized in that: Both end surfaces of the base (1) are connected to hanging blocks (8), and the bottom surface of the hanging blocks (8) is 20-30 mm away from the bottom surface of the base (1).

5. A shim for a forging heat treatment furnace as claimed in claim 1, characterized in that: The upper corners on both sides of the base (1) are arranged as inclined surfaces, and the angle of the inclined surfaces is 45 to 60 degrees.

6. A shim for a forging heat treatment furnace as claimed in claim 1, characterized in that: The two ends of the strip-shaped groove (2) penetrate through the two end surfaces of the base (1).

7. A shim for a forging heat treatment furnace as claimed in claim 1, characterized in that: The width of the base (1) is 0.9-1.2 times the height of the base (1).

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