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

Abstract

The present invention discloses a forming method and a forming tooling for an arc-shaped single-layer metal honeycomb belt. The forming method includes: calculating the inner diameter and the outer diameter of the target single-layer metal honeycomb belt according to the design parameters, and constructing a single-layer metal honeycomb belt model according to the calculation results; dividing the single-layer metal honeycomb belt model into multiple honeycomb belt model units, and calculating the inner length and the outer length of the honeycomb belt model units; unfolding the honeycomb belt model units to obtain blank parameters; preparing a physical blank according to the blank parameters; using the forming tooling to form the physical blank to obtain a honeycomb belt physical unit; and welding and connecting multiple honeycomb belt physical units to obtain the 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 that defects such as honeycomb cell distortion, middle layer collapse and springback can be eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and particularly relates to a forming method and a forming tooling for an arc-shaped single-layer metal honeycomb belt. Background Art

[0002] Metal honeycomb seals generate strong eddy currents through their honeycomb structures, thereby forming a large damping to achieve the purpose of reducing the leakage of fluid media and improving the efficiency of the unit. Currently, they are widely used in mechanical equipment such as steam turbines and internal combustion engines with fluid high-speed rotating shaft systems. The metal honeycomb seal is composed of a honeycomb belt and a matrix through special connection processes such as vacuum brazing. The metal honeycomb belt is composed of a number of hexagonal small honeycomb holes. The distance between the opposite sides of the hexagonal honeycomb holes is usually 0.8 - 6 mm, and the honeycomb depth is usually 1.6 - 6 mm. The metal honeycomb belt is stacked and welded by single-layer metal belts with convex and concave features. The currently adopted method is to first form a straight honeycomb belt with convex and concave features in a single layer, then stack and weld to form a multi-layer metal honeycomb belt, and then bend and form according to the required arc radius size to finally obtain the required metal honeycomb belt. Since the bending radii of the inner and outer layers of the metal honeycomb belt are different, the honeycomb cells will be distorted after bending, that is, the middle layer will collapse, and at the same time, it is difficult to fix the shape due to springback.

[0003] Therefore, there is an urgent need for a forming method and a tooling die for an arc-shaped single-layer metal honeycomb belt that can eliminate defects such as honeycomb cell distortion, middle layer collapse, and springback. 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 to solve the problems of honeycomb cell distortion, middle layer collapse, and springback after bending and forming as 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, and defects such as honeycomb cell distortion, middle layer collapse, and springback can be eliminated.

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

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

[0007] Step S2: Divide the single-layer metal honeycomb belt model into 2 - 10 honeycomb belt model units of equal size, and arbitrarily select one of the honeycomb belt model units, calculate the length based on the middle layer thereof, and thus obtain the inner circle length and the outer circle length of the honeycomb belt model unit;

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

[0009] Step S4: Prepare a number of physical blanks according to the blank parameters obtained in Step S3;

[0010] Step S5: Use a forming die tooling to form the physical blanks, thereby obtaining a number of honeycomb belt physical units;

[0011] Step S6: Weld and connect a number of the honeycomb belt physical units that are the same in number as the honeycomb belt model units in Step S2, and finally obtain the target single-layer metal honeycomb belt.

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

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

[0014] Further, between Step S5 and Step S6, there is also a step of cutting the two ends of the honeycomb belt physical unit.

[0015] The present invention also provides a forming tooling for an arc-shaped single-layer metal honeycomb belt. The forming tooling is used for the above-mentioned forming method. The forming tooling includes a pressing plate, a punch, side baffles A and a die. The die has two forming grooves that are the same in size and shape as a single honeycomb of the target single-layer metal honeycomb belt. The side baffles A are two pieces arranged in parallel on one side of the die, and 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 baffles A, and is used to form a single honeycomb on the physical blank successively; the pressing plate is located above the forming groove on the side far from the side baffles A, and is used to press the previously formed honeycomb and maintain the formed shape for positioning; the physical blank feeds along the forming direction under the action of a driving force.

[0016] The present invention also provides another forming tooling for an arc-shaped single-layer metal honeycomb belt. The forming tooling is used for the above-mentioned forming method. The forming tooling includes an upper roller, a lower roller and side baffles B. The upper roller and the lower roller both have rolling forming teeth that are consistent with the tooth shape of a single honeycomb of the target single-layer metal honeycomb belt. The upper roller and the lower roller respectively roll and form the physical blank according to design requirements by a driving device; the side baffles B are 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 through calculation and prepares physical blanks according to the parameters; uses a forming die tooling to form the physical blanks to obtain a number of honeycomb belt physical units; and welds and connects the multiple honeycomb belt physical units to obtain the 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 that defects such as honeycomb cell distortion, middle layer collapse and springback can be eliminated.

[0019] (2) The forming die of the arc-shaped single-layer metal honeycomb belt of the present invention can directly stamp or roll-form the honeycomb belt physical unit according to the required arc radius. The forming adopts the method of forming a single honeycomb successively. After forming a honeycomb groove, the blank is moved; or directly form the honeycomb tooth shape, with high forming accuracy, and defects such as honeycomb cell distortion, middle layer collapse and springback can be eliminated.

[0020] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The following will refer to the drawings to further elaborate on the present invention in detail. Description of the Drawings

[0021] The 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 to the embodiments of the present invention. In the drawings:

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

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

[0024] Figure 3 is to Figure 2 the structural schematic diagram after dividing the single-layer honeycomb belt in

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

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

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

[0028] Figure 7 is the structural schematic diagram of the rolling die in the present invention. Detailed Embodiments

[0029] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. It should be noted that these embodiments are not limitations on the present invention, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

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

[0031] Step S1: Calculate the inner diameter and outer diameter of the target single-layer metal honeycomb belt according to the design parameters, and construct a single-layer metal honeycomb belt model based on 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 arbitrarily select one honeycomb belt model unit to calculate the 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: Unfold the honeycomb belt model unit to obtain the blank parameters, where the inner arc length and outer arc length of the blank are respectively equal to the inner circle length and outer circle length of the honeycomb belt model unit.

[0034] Step S4: Prepare a number 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: Use a forming die tooling to form the physical blank, thereby obtaining a number of honeycomb belt physical units.

[0036] Step S6: Weld and connect a number of honeycomb belt physical units that are the same in number as the honeycomb belt model units in step S2 to finally obtain the 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 ends of the honeycomb belt physical unit.

[0038] Taking the forming of one metal honeycomb belt part of the present invention as an example, it is specifically as follows:

[0039] As Figure 1 is a three-dimensional view of the metal honeycomb belt structure. The surface of this metal honeycomb belt is composed of a honeycomb belt formed by regular arrangement of honeycomb holes in the shape of regular hexahedrons through welding and lamination. The inner diameter is 150 mm, and the outer diameter is 160 mm. The height of the single-layer honeycomb belt of this metal honeycomb belt is 1.8 mm (the width of the opposite sides of the honeycomb is 3.6 mm), the thickness of the metal belt material is 0.1 mm, and one circumference contains 80 honeycomb grooves.

[0040] As Figure 2 shown, it is a schematic structural diagram of a single-layer honeycomb belt of a metal honeycomb belt in Figure 1 . The single-layer honeycomb belt in Figure 2 is evenly divided into 4 parts as shown in Figure 3 in Figure 4 (i.e., divided into 4 honeycomb belt model units). Each part is a 1 / 4 circle. Arbitrarily select one from the 4 parts and calculate the length with the middle layer. As Figure 4 shown, L1 is the inner circle length and L2 is the outer circle length. After calculation, 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 lengths of the inner and outer circles of the arc are the arc-shaped blanks obtained after unfolding according to the lengths of L1 and L2. As Figure 5 shown, where 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 wrinkles will occur due to compression during the deformation of the material, the length of the blank is constructed based on l2. Considering the cutting of the blank end for welding, the actual formed blank length is at least 1 to 2 slot lengths longer than the calculated length. After welding the 4 prepared honeycomb belt physical units, a complete circle can be formed, as Figure 3 shown.

[0041] As Figure 6 shown, the present invention also provides a forming tool for an arc-shaped single-layer metal honeycomb belt. This forming tool is used for the forming method of the above-mentioned arc-shaped single-layer metal honeycomb belt. This forming tool includes a pressing plate 1, a punch 2, side baffles A3, and a die 5. The die 5 has two forming grooves with the same size as a single honeycomb shape of the target single-layer metal honeycomb belt. There are two side baffles A3, and the two side baffles A3 are arranged in parallel on the feeding side of the die 5 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 to successively form a single honeycomb on the physical blank 4. The pressing plate 1 is located above the forming groove on the side far from the side baffle A3 to press and hold the previously formed honeycomb to maintain the formed shape for positioning. The physical blank 4 feeds along the forming direction under the action of a driving force. Specifically, the forming adopts the method of successively forming a single honeycomb. After forming a honeycomb groove, move the blank 4, and at the same time make the formed honeycomb groove fall into the groove on the left side of the die 5. During forming, the side baffle A3 restricts 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 and hold the formed honeycomb groove to maintain the formed shape.

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

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within 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 forming method comprises using a curved single-layer metal honeycomb strip forming tool, the forming tool comprising a pressing plate (1), a punch (2), a side baffle A (3) and a die (5), the die (5) having two forming grooves of the same size as the single honeycomb shape of the target single-layer metal honeycomb strip, the side baffle A (3) being two pieces arranged in parallel on one side of the die (5) and used for positioning the physical blank (4) in the width direction; the punch (2) being located above the forming groove on the side close to the side baffle A (3) and used for successively forming single honeycombs on the physical blank (4); the pressing plate (1) being located above the forming groove on the side away from the side baffle A (3) and used for pressing the last formed honeycomb and maintaining the formed shape for positioning; the physical blank (4) is fed along the forming direction under the action of a driving force; the forming method comprises the following steps: 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, using a forming tool to successively form a single honeycomb on each of the physical blanks, 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 step S2, the single-layer metal honeycomb belt is divided into 4 to 6 honeycomb belt 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 method for forming an arc-shaped single-layer metal honeycomb belt, characterized in that: The forming method comprises using an arc-shaped single-layer metal honeycomb strip forming tool, the forming tool comprising an upper roller (6), a lower roller (7) and a side baffle B (8), the upper roller (6) and the lower roller (7) both having rolling forming teeth consistent with the tooth shape of a single honeycomb of the target single-layer metal honeycomb strip, the upper roller (6) and the lower roller (7) are respectively driven by a driving device to roll-form a physical blank (4) according to design requirements; the side baffle B (8) is used to position the physical blank (4); the forming method comprises the following steps: 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, using a forming tool to roll-form each of the physical blanks to obtain 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.

6. The forming method according to claim 5, characterized in that: In step S2, the single-layer metal honeycomb belt is divided into 4 to 6 honeycomb belt model units of equal size.

7. The forming method according to claim 5, characterized in that: In the step S4, the length of the physical blank is constructed based on the outer arc length of the blank.

8. The forming method according to claim 5, 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.

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