Forming method and forming tool for arc-shaped single-layer metal honeycomb belt

Abstract

The invention discloses a forming method and tool for an arc-shaped single-layer metal honeycomb band, and the forming method comprises the steps: calculating the diameter of an inner ring and the diameter of an outer ring of a target single-layer metal honeycomb band according to the design parameters of the target single-layer metal honeycomb band, and constructing a single-layer metal honeycomb band model according to the calculation result; the single-layer metal honeycomb belt model is divided into a plurality of honeycomb belt model units, and the inner ring length and the outer ring length of the honeycomb belt model units are obtained through calculation; unfolding the honeycomb belt model unit to obtain blank parameters; a physical blank is prepared according to the blank parameters; forming the physical blank by using a forming tool to obtain a honeycomb strip physical unit; and the multiple honeycomb band physical units are welded and connected, and the target single-layer metal honeycomb band is obtained. The single-layer metal honeycomb belt formed through the method is directly formed according to the needed arc radius, and therefore the defects of honeycomb lattice distortion, middle layer collapse, springback and the like can be overcome.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a forming method and a forming tool for an arc-shaped single-layer metal honeycomb belt. Background Art

[0002] Metal honeycomb seals use their honeycomb structure to generate strong eddy currents, thereby forming a large damping to reduce fluid medium leakage and improve unit efficiency. They are currently widely used in mechanical equipment with high-speed fluid shaft systems such as steam turbines and internal combustion engines. Metal honeycomb seals are composed of honeycomb strips and substrates that are connected by special connection processes such as vacuum brazing. The metal honeycomb strip is composed of a number of small hexagonal honeycomb holes. The distance between the opposite sides of the hexagonal honeycomb holes is usually 0.8-6mm, and the honeycomb depth is usually 1.6-6mm. The metal honeycomb strip is formed by stacking and welding a single layer of metal strips with convex and concave features. The current method is to first form a single layer of straight honeycomb strips with convex and concave features, then form a multi-layer metal honeycomb strip by stacking and welding, and then bend it according to the required arc radius to finally obtain the required metal honeycomb strip. Since the inner and outer layers of the metal honeycomb strip have different bending radii, the honeycomb grid will be distorted after bending, that is, the middle layer will collapse, and the shape is difficult to fix due to rebound.

[0003] Therefore, there is an urgent need for a method and tooling die for forming a curved single-layer metal honeycomb belt that can eliminate defects such as honeycomb grid distortion, middle layer collapse and rebound. Summary of the invention

[0004] The purpose of the present invention is to provide a method for directly forming an arc-shaped single-layer metal honeycomb belt, so as to solve the problems of distortion of the honeycomb grid, collapse and rebound of the middle layer after bending and forming proposed in the background art. The single-layer metal honeycomb belt formed by the present invention is directly formed according to the required arc radius, which can eliminate the defects of honeycomb grid distortion, collapse and rebound of the middle layer.

[0005] To achieve the above object, the present invention provides a method for forming an arc-shaped single-layer metal honeycomb belt, comprising the following steps:

[0006] Step S1, calculating the inner ring diameter and the outer ring diameter of the target single-layer metal honeycomb belt according to the design parameters of the target single-layer metal honeycomb belt, and constructing a single-layer metal honeycomb belt model according to the calculation results;

[0007] Step S2, dividing the single-layer metal honeycomb belt model into 2 to 10 honeycomb belt model units of equal size, and taking any one of the honeycomb belt model units, calculating the length thereof based on the middle layer, thereby obtaining the inner circle length and the outer circle length of the honeycomb belt model unit;

[0008] Step S3, unfolding the honeycomb belt model unit to obtain blank parameters, wherein the inner arc length and the outer arc length of the blank are respectively equal to the inner circle length and the outer circle length of the honeycomb belt model unit;

[0009] Step S4, preparing a plurality of physical blanks according to the blank parameters obtained in step S3;

[0010] Step S5, forming the physical blank using a forming mold tool, thereby obtaining a plurality of honeycomb belt physical units;

[0011] Step S6, welding and connecting a plurality of the honeycomb belt physical units having the same number as the honeycomb belt model units in step S2, and finally obtaining a target single-layer metal honeycomb belt.

[0012] Furthermore, in step S2, the single-layer metal honeycomb belt is divided into 4 to 6 honeycomb belt model units of equal size.

[0013] Furthermore, in step S4, the length of the physical blank is constructed based on the outer arc length of the blank.

[0014] Furthermore, between step S5 and step S6, the method further includes cutting the two end caps of the honeycomb strip physical unit.

[0015] The present invention also provides a forming tool for an arc-shaped single-layer metal honeycomb belt, which is used for the above-mentioned forming method. The forming tool comprises a pressing plate, a punch, a side baffle A and a mold, wherein the mold has two forming grooves of the same size as the single honeycomb shape of the target single-layer metal honeycomb belt, and the side baffle A is two pieces arranged in parallel on one side of the mold, which are used to position the physical blank in the width direction; the punch is located above the forming groove on the side close to the side baffle A, and is used to successively form single honeycombs of the physical blank; the pressing plate is located above the forming groove on the side away from the side baffle A, and is used to press the last formed honeycomb and maintain the formed shape for positioning; the physical blank is fed along the forming direction under the action of the driving force.

[0016] The present invention also provides another arc-shaped single-layer metal honeycomb belt forming tool, which is used for the above-mentioned forming method. The forming tool includes an upper roller, a lower roller and a side baffle B. The upper roller and the lower roller both have rolling forming teeth consistent with the tooth shape of a single honeycomb of the target single-layer metal honeycomb belt. The upper roller and the lower roller are respectively driven by a driving device to roll-form the physical blank according to design requirements; the side baffle B is used to position the physical blank.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The forming method of the arc-shaped single-layer metal honeycomb belt of the present invention obtains blank parameters by calculation, and prepares a physical blank according to the actual blank; forms the physical blank using a forming mold tool to obtain a plurality of honeycomb belt physical units; and welds and connects a plurality of honeycomb belt physical units to obtain a target single-layer metal honeycomb belt. The single-layer metal honeycomb belt formed by the method of the present invention is directly formed according to the required arc radius, so defects such as honeycomb grid distortion, middle layer collapse and rebound can be eliminated.

[0019] (2) The forming die of the arc-shaped single-layer metal honeycomb belt of the present invention can directly punch or roll the honeycomb belt physical unit according to the required arc radius. The forming adopts the method of forming a single honeycomb one by one, and the blank is moved after forming a honeycomb groove; or the honeycomb tooth shape is directly formed. The forming accuracy is high and defects such as honeycomb grid distortion, middle layer collapse and rebound can be eliminated.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the metal honeycomb belt structure in the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of a single-layer honeycomb belt in the present invention;

[0024] Figure 3 Yes Figure 2 Schematic diagram of the structure after the single-layer honeycomb belt is divided into 4 parts;

[0025] Figure 4 It is a calculation diagram of the edge lengths of the inner and outer rings of the single-layer honeycomb belt model unit in the present invention;

[0026] Figure 5 It is a schematic diagram of a single-layer honeycomb with an arc-shaped blank in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the stamping forming die in the present invention;

[0028] Figure 7 It is a structural schematic diagram of the rolling forming die in the present invention. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0030] This embodiment provides a method for forming an arc-shaped single-layer metal honeycomb belt, comprising the following steps:

[0031] Step S1, calculating the inner circle diameter and the outer circle diameter of the target single-layer metal honeycomb belt according to the design parameters of the target single-layer metal honeycomb belt, and constructing a single-layer metal honeycomb belt model according to the calculation results.

[0032] Step S2, divide the single-layer metal honeycomb belt model into 2 to 10 honeycomb belt model units of equal size, and randomly select one honeycomb belt model unit, and calculate its length based on its middle layer, thereby obtaining the inner circle length and outer circle length of the honeycomb belt model unit; preferably, in step S2, the single-layer metal honeycomb belt is divided into 4 to 6 honeycomb belt model units of equal size.

[0033] Step S3, unfolding the honeycomb belt model unit to obtain blank parameters, wherein the inner arc length and the outer arc length of the blank are respectively equal to the inner circle length and the outer circle length of the honeycomb belt model unit.

[0034] Step S4: prepare a plurality of physical blanks according to the blank parameters obtained in step S3; the length of the physical blank is constructed based on the outer arc length of the blank.

[0035] Step S5: forming the physical blank using a forming mold tool to obtain a plurality of physical honeycomb belt units.

[0036] Step S6, welding and connecting a plurality of honeycomb belt physical units having the same number as the honeycomb belt model units in step S2, and finally obtaining a target single-layer metal honeycomb belt.

[0037] It should be noted that, between step S5 and step S6, there is also a step of cutting the two end heads of the honeycomb strip physical unit.

[0038] The present invention takes the forming of one of the metal honeycomb belt parts as an example, which is specifically as follows:

[0039] like Figure 1 The three-dimensional diagram of the metal honeycomb belt structure. The surface of the metal honeycomb belt is composed of a regular hexahedron-shaped honeycomb belt with regularly arranged honeycomb holes, which is welded and laminated. The inner circle diameter is 150mm and the outer circle diameter is 160mm. The height of a single layer of the metal honeycomb belt is 1.8mm (the width of the honeycomb opposite side is 3.6mm), the thickness of the metal belt material is 0.1mm, and one circumference contains 80 honeycomb grooves.

[0040] like Figure 2 As shown, Figure 1 Schematic diagram of the structure of a single-layer honeycomb belt of a metal honeycomb belt. Figure 2 The single-layer honeycomb strips in the Figure 3 The 4 parts shown in (i.e., divided into 4 honeycomb belt model units), each part is 1 / 4 circle, and any one of the 4 parts is selected and the length is calculated based on the middle layer, as shown in FIG. Figure 4 As shown, L1 is the length of the inner circle, L2 is the length of the outer circle, and the calculated L1 is 152.77 mm, and L2 is 159.71 mm. In the embodiment of the present invention, the blank is an arc shape with the same radius as the inner and outer circles of the honeycomb belt. The arc length of the inner and outer circles of the arc is expanded according to the length of L1 and L2 to obtain the arc-shaped blank as shown in FIG. Figure 5 As shown, the inner arc length l1 = L1, and the outer arc length l2 = L2. It can be seen that the central angle corresponding to the inner arc length l1 is greater than the central angle corresponding to the outer arc length l2. Considering that the material will wrinkle when compressed during the deformation process, the length of the billet is constructed based on l2. Considering the cutting of the billet end for welding, the actual length of the billet is at least 1 to 2 slots longer than the calculated length. After welding the prepared 4 honeycomb belt physical units, a full circle can be formed, as shown in Figure 3 shown.

[0041] like Figure 6 As shown, the present invention also provides a curved single-layer metal honeycomb belt forming tool, which is used for the forming method of the curved single-layer metal honeycomb belt. The forming tool includes a pressing plate 1, a punch 2, a side baffle A3 and a mold 5. The mold 5 has two forming grooves of the same size as the single honeycomb shape of the target single-layer metal honeycomb belt. The side baffles A3 are two pieces, and the two side baffles A3 are arranged in parallel on the feeding side of the mold 5, which are used to position the physical blank 4 in the width direction; the punch 2 is located above the forming groove on the side close to the side baffle A3, and is used to form a single honeycomb on the physical blank 4 one by one; the pressing plate 1 is located above the forming groove on the side away from the side baffle A3, and is used to press the last formed honeycomb and maintain the formed shape for positioning. The physical blank 4 is fed along the forming direction under the action of the driving force. Specifically, the forming adopts a single honeycomb forming method one by one. After forming a honeycomb groove, the blank 4 is moved, and the formed honeycomb groove falls into the groove on the left side of the mold 5. During forming, the side baffle A3 limits the material so that the physical blank 4 can only move in the arc groove. The punch 2 presses the blank to form a single honeycomb groove, and the pressing plate 1 can press the formed honeycomb groove to maintain the formed shape.

[0042] like Figure 7As shown, the present invention also provides another arc-shaped single-layer metal honeycomb belt forming tool, which is used in the forming method of the arc-shaped single-layer metal honeycomb belt, and the forming tool includes an upper roller 6, a lower roller 7 and a side baffle B8, and the upper roller 6 and the lower roller 7 both have rolling forming teeth consistent with the tooth shape of a single honeycomb of the target single-layer metal honeycomb belt, and the upper roller 6 and the lower roller 7 are respectively driven by a driving device to roll the physical blank 4 according to the design requirements; the side baffle B8 is used to position the physical blank 4. Specifically, the side baffle B8 confines the physical blank 4 in the arc-shaped groove, and the honeycomb tooth shape is directly formed by the rolling of the upper roller 6 and the lower roller 7.

[0043] 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 variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for forming an arc-shaped single-layer metal honeycomb belt, characterized in that: The steps include: Step S1, calculating the inner ring diameter and the outer ring diameter of the target single-layer metal honeycomb belt according to the design parameters of the target single-layer metal honeycomb belt, and constructing a single-layer metal honeycomb belt model according to the calculation results; Step S2, dividing the single-layer metal honeycomb belt model into 2 to 10 honeycomb belt model units of equal size, and taking any one of the honeycomb belt model units, calculating the length thereof based on the middle layer, thereby obtaining the inner circle length and the outer circle length of the honeycomb belt model unit; Step S3, unfolding the honeycomb belt model unit to obtain blank parameters, wherein the inner arc length and the outer arc length of the blank are respectively equal to the inner circle length and the outer circle length of the honeycomb belt model unit; Step S4, preparing a plurality of physical blanks according to the blank parameters obtained in step S3; Step S5, forming the physical blank using a forming mold tool, thereby obtaining a plurality of honeycomb belt physical units; Step S6, welding and connecting a plurality of the honeycomb belt physical units having the same number as the honeycomb belt model units in step S2, and finally obtaining a target single-layer metal honeycomb belt.

2. The forming method according to claim 1, characterized in that: In the step S2, the single-layer metal honeycomb strip is divided into 4 to 6 honeycomb strip model units of equal size.

3. The forming method according to claim 1, characterized in that: In the step S4, the length of the physical blank is constructed based on the outer arc length of the blank.

4. The forming method according to claim 1, characterized in that: Between step S5 and step S6, a step of cutting the two end ends of the honeycomb strip physical unit is also included.

5. A curved single-layer metal honeycomb strip forming tool, characterized in that: The forming tool is used for the forming method as described in any one of claims 1 to 4, and the forming tool comprises a pressing plate (1), a punch (2), a side baffle A (3) and a mold (5), wherein the mold (5) has two forming grooves of the same size as the single honeycomb shape of the target single-layer metal honeycomb belt, and the side baffle A (3) is two pieces arranged in parallel on one side of the mold (5) for positioning the physical blank (4) in the width direction; the punch (2) is located above the forming groove on the side close to the side baffle A (3) and is used to successively form single honeycombs for the physical blank (4); the pressing plate (1) is located above the forming groove on the side away from the side baffle A (3) and is used to press the last formed honeycomb and maintain the formed shape for positioning; the physical blank (4) is fed along the forming direction under the action of the driving force.

6. A curved single-layer metal honeycomb strip forming tool, characterized in that: The forming tool is used for the forming method as described in any one of claims 1 to 4, and the forming tool comprises an upper roller (6), a lower roller (7) and a side baffle B (8), wherein the upper roller (6) and the lower roller (7) both have rolling forming teeth consistent with the tooth shape of a single honeycomb of the target single-layer metal honeycomb belt, and the upper roller (6) and the lower roller (7) are respectively driven by a driving device to roll-form the physical blank (4) according to design requirements; the side baffle B (8) is used to position the physical blank (4).

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