CN113103618B - Metal compression roller for in-situ forming of thermoplastic composite material and design method thereof - Google Patents
Metal compression roller for in-situ forming of thermoplastic composite material and design method thereof Download PDFInfo
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- CN113103618B CN113103618B CN202110348180.2A CN202110348180A CN113103618B CN 113103618 B CN113103618 B CN 113103618B CN 202110348180 A CN202110348180 A CN 202110348180A CN 113103618 B CN113103618 B CN 113103618B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/26—Composites
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a metal compression roller for in-situ molding of thermoplastic composite materials and a method thereof, wherein the metal compression roller comprises a metal roller sheet, a roller shaft, a fixed block and an installation plate; the two ends of the roller shaft are fixed on the mounting plate through the fixing blocks, the metal roller sheet is composed of an inner ring, a supporting layer, an outer ring and a rolling body, the inner ring is assembled on the roller shaft through the rolling body, the outer ring is a ring body made of flexible metal and located on the outer side of the inner ring, the outer ring is connected with the inner ring through the supporting layer, when the metal pressing roller rolls the thermoplastic composite material, the outer ring is in contact with the thermoplastic composite material and is pressed, and the outer ring and the supporting layer are stressed and deformed, so that the contact area between the outer ring and the thermoplastic composite material is increased. The invention improves the deformability of the metal compression roller by reducing the structural rigidity of the metal compression roller, and can design proper roller sheets aiming at the forming characteristics of different composite materials, thereby improving the forming quality and efficiency of in-situ consolidation forming of the high-performance thermoplastic composite material and reducing the manufacturing cost of the high-performance thermoplastic composite material.
Description
Technical Field
The invention belongs to the field of advanced manufacturing of high-performance thermoplastic composite materials, and particularly relates to a thermoplastic composite material forming compression roller, in particular to a device and a method for quickly thermally splicing thermoplastic resin prepreg yarns for high-prestress forming.
Background
With the reduction of the cost of high-performance thermoplastic materials and the demand of the market for light weight of the materials, the thermoplastic materials and the thermoplastic composite materials gradually show great advantages in the aspects of performance, molding efficiency, cost performance and the like. Because the thermoplastic composite material only generates physical change in the molding process, the molding speed is high, and the in-situ consolidation molding of the material can be realized. The in-situ consolidation is a forming mode of heating by using a local heat source and simultaneously pressurizing consolidation, the in-situ consolidation forming is less restricted by a forming field, the forming of a workpiece with a complex shape can be realized, the forming efficiency is high, and the method has a wide application prospect.
Because the high-performance thermoplastic resin matrix has high melting point and high melt viscosity, high temperature and high pressure are needed in the in-situ forming process, and in order to ensure that molecular chains of the matrix of the composite material are fully diffused and the porosity of the composite material is reduced, enough temperature rise and pressure rise time of the material in the forming process is needed to be ensured. Particularly, the forming temperature of the high-performance thermoplastic composite material represented by polyaryletherketone family is generally higher than 300 ℃, the forming pressure is more than 1MPa, and the forming requirement of the traditional rubber compacting device is difficult to meet. The compression roller of the compaction device used for the existing in-situ consolidation forming is mainly divided into a metal rigid compression roller and a high-temperature-resistant rubber flexible compression roller, but the metal rigid compression roller has poor deformation capability, small contact area between the compression roller and a composite material and extremely short pressure action time, so that the pressure and the pressure action time in the forming process can not meet the forming requirement of a thermoplastic composite material, the forming efficiency is low, the product quality is poor, and the forming requirement of a high-performance thermoplastic composite material product can not be met. The high-temperature-resistant rubber compression roller can effectively prolong the hot pressing time, but has lower modulus, lower molding pressure, high price of high-performance heat-resistant rubber, easy aging in high-temperature use, limited service life and high use cost, and is not beneficial to large-scale application of thermoplastic composite materials.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology and provides a metal compression roller for in-situ forming of thermoplastic composite materials and a design method thereof. The invention designs a metal flexible compression roller, which designs and manufactures a metal roller sheet with internal support by utilizing the high temperature resistance, good mechanical property and good processing and forming property of a metal material, reduces the structural rigidity of the metal compression roller, improves the deformability of the metal compression roller, can design a proper roller sheet according to the forming characteristics of different composite materials, improves the forming quality and efficiency of in-situ consolidation forming of high-performance thermoplastic composite materials, and reduces the manufacturing cost of the high-performance thermoplastic composite materials.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the metal compression roller for in-situ forming of the thermoplastic composite material comprises: comprises a metal roller sheet, a roller shaft, a fixed block and a mounting plate; the two ends of the roller shaft are fixed on the mounting plate through the fixing blocks, the metal roller sheet is composed of an inner ring, a supporting layer, an outer ring and a rolling body, the inner ring is assembled on the roller shaft through the rolling body, the outer ring is a ring body made of flexible metal and located on the outer side of the inner ring, the outer ring is connected with the inner ring through the supporting layer, when the metal pressing roller rolls the thermoplastic composite material, the outer ring is in contact with the thermoplastic composite material and is pressed, and the outer ring and the supporting layer are stressed and deformed, so that the contact area between the outer ring and the thermoplastic composite material is increased.
In order to optimize the technical scheme, the specific measures adopted further comprise:
foretell fixed block has two, is located the roller both ends respectively, and every fixed block all includes fixed part, lower fixed part and retaining member, and the tip of roller can be installed between the last fixed part that corresponds and lower fixed part to by the retaining member lock is dead fixed, goes up fixed part and mounting panel fixed connection.
The upper fixing part and the lower fixing part are connected and fixed into a whole through screws or welding or buckles.
The upper fixing part and the mounting plate are connected and fixed into a whole through screws or welding or clamping.
The supporting layer is composed of a plurality of metal sheets, the metal sheets are arranged between the inner ring and the outer ring at equal intervals, one end of each metal sheet is connected with the inner ring, the other end of each metal sheet is connected with the outer ring, and the metal sheets are arc-shaped sheets or linear sheets or wavy sheets or spiral sheets which are scattered along the radial direction.
The design method of the metal compression roller for in-situ forming of the thermoplastic composite material comprises the following steps:
the method comprises the following steps: recording roller sheets eachThe equivalent elastic coefficient is k, the value of k is mainly determined by the thickness of the outer ring of the roller sheet, the rigidity of the metal sheets of the supporting layer and the number of the metal sheets of the supporting layer, and the quantity, the thickness and the shape of the metal sheets of the supporting layer and the thickness of the outer ring need to be changed due to the non-continuity of the structure, so that the fluctuation of the k value at each position of the roller sheet
The pressure provided by each part of the roller sheet is ensured to be uniform;
step two: recording the width of the roller sheet as a, the excircle radius of the roller sheet as r, and contacting the roller sheet with the composite material or the mold to generate radial displacement delta r of the outer ring of the roller sheet under the action of an external force with the magnitude of F, and then forming and compacting the contact length
The contact area is S ═ a × l, the forming average pressure Sigma provided by the roll sheet is F ÷ S, and the outer ring diameter and the width of the roll sheet are adjusted to obtain the formed compaction contact area S and the compaction pressure Sigma;
step three: and (3) calculating and analyzing the stress of each part of the roller sheet under the action of the external force F, if the miss stress of a certain part is greater than the fatigue strength of the material, changing the material and the size of the roller sheet, and repeating the first step and the second step until the roller sheet can meet the requirements of preset pressure uniformity, compaction contact area and compaction pressure.
The outer ring was made from 6061 aluminum alloy.
Compared with the prior art, the invention has the advantages that:
1. the metal flexible compression roller has high deformability and low cost, and the rigidity of the metal flexible compression roller is reduced by a structural design mode, so that the defects of poor deformability of the traditional metal rigid compression roller and high cost of the rubber compression roller are effectively overcome;
2. the forming quality is high, the efficiency is high, the structural rigidity of the compression roller is reduced by designing the structure of the metal compression roller, the compaction area and the compaction action time of the in-situ forming compression roller are increased, and the quality and the efficiency of in-situ consolidation forming of the thermoplastic composite material are improved;
3. the designability is strong, and the press roll with proper size and shape can be designed according to the pressure and the pressure acting duration required by material molding aiming at different thermoplastic composite materials, so that good molding quality and efficiency are achieved.
Drawings
FIG. 1 is an isometric view of the device;
FIG. 2 is a front view of the device;
FIG. 3 is an isometric view of the roll sheet and shaft;
FIG. 4 is a schematic view of the roll sheet after deformation;
fig. 5-8 are side views of different roller sheets.
The label names in the figure: the roller comprises a metal roller sheet 1, an inner ring 11, a supporting layer 12, an outer ring 13, rolling bodies 14, a roller shaft 2, a fixing block 3, an upper fixing part 31, a lower fixing part 32, a locking piece 33, a mounting plate 4, a mold 5 and a thermoplastic composite material 51.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
The metal compression roller for in-situ forming of the thermoplastic composite material of the embodiment comprises: comprises a metal roller sheet 1, a roller shaft 2, a fixed block 3 and a mounting plate 4; the two ends of the roller shaft 2 are fixed on the mounting plate 4 through the fixing blocks 3, the metal roller sheet 1 is composed of an inner ring 11, a supporting layer 12, an outer ring 13 and rolling bodies 14, the inner ring 11 is assembled on the roller shaft 2 through the rolling bodies 14, the outer ring 13 is a ring body made of flexible metal and is positioned on the outer side of the inner ring 11, the outer ring 13 is connected with the inner ring 11 through the supporting layer 12, and the inner ring 11, the supporting layer 12 and the outer ring 13 can rotate relative to the roller shaft 2 through the rolling bodies 14; when the metal pressing roller rolls the thermoplastic composite material, the outer ring 13 is in contact with the thermoplastic composite material and is pressed, and the outer ring 13 and the supporting layer 12 are both stressed and deformed, so that the contact area between the outer ring 13 and the thermoplastic composite material is increased.
In the embodiment, there are two fixing blocks 3 respectively located at two ends of the roller shaft 2, each fixing block 3 includes an upper fixing portion 31, a lower fixing portion 32 and a locking member 33, the end portion of the roller shaft 2 can be installed between the corresponding upper fixing portion 31 and the corresponding lower fixing portion 32 and is locked and fixed by the locking member 33, and the upper fixing portion 31 is fixedly connected with the mounting plate 4.
In the embodiment, the upper fixing portion 31 and the lower fixing portion 32 are fixed together by screws. The upper fixing portion 31 and the mounting plate are fixed together by welding.
In the embodiment, the supporting layer 12 is composed of 24 metal sheets, each metal sheet has a thickness not greater than 10mm, the metal sheets are arranged between the inner ring 11 and the outer ring 13 at equal intervals, one end of each metal sheet is connected with the inner ring 11, the other end of each metal sheet is connected with the outer ring 13, the metal sheets are arc-shaped sheets or linear sheets or wavy sheets or spiral sheets which are scattered along the radial direction, and fig. 5 to 8 respectively show four structural forms of the metal sheets.
The design method of the metal compression roller for in-situ forming of the thermoplastic composite material comprises the following steps:
the method comprises the following steps: the equivalent elastic coefficient of each position of the roller sheet is recorded as k, the value of k is mainly determined by the thickness of the outer ring of the roller sheet, the rigidity of the metal sheets of the supporting layer and the number of the metal sheets of the supporting layer, and the quantity, the thickness and the shape of the metal sheets of the supporting layer and the thickness of the outer ring need to be changed due to the non-continuity of the structure, so that the fluctuation of the value of k at each position of the roller sheet is caused
The pressure provided by each part of the roller sheet is ensured to be uniform;
step two: recording the width of the roller sheet as a, the excircle radius of the roller sheet as r, and contacting the roller sheet with the composite material or the mold to generate radial displacement delta r of the outer ring of the roller sheet under the action of an external force with the magnitude of F, and then forming and compacting the contact length
The contact area is S ═ a × l, the forming average pressure Sigma provided by the roll sheet is F ÷ S, and the outer ring diameter and the width of the roll sheet are adjusted to obtain the formed compaction contact area S and the compaction pressure Sigma;
step three: and (3) calculating and analyzing the stress of each part of the roller sheet under the action of the external force F, if the miss stress of a certain part is greater than the fatigue strength of the material, changing the material and the size of the roller sheet, and repeating the first step and the second step until the roller sheet can meet the requirements of preset pressure uniformity, compaction contact area and compaction pressure.
According to calculation, the outer ring 13 is made of 6061 aluminum alloy, the width of the roller sheet is 20mm, the outer diameter of the outer ring surface of the roller sheet is 180mm, the maximum miss stress of the pressing roller is 85.82MPa under the action of an external force F which is 3295N, the compression stress of about 30.9MPa can be provided for composite material forming, and the contact length is about 5.3 mm.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (6)
1. The design method of the metal compression roller for the in-situ forming of the thermoplastic composite material applies the metal compression roller for the in-situ forming of the thermoplastic composite material, and is characterized in that: the metal compression roller for in-situ forming of the thermoplastic composite material comprises a metal roller sheet (1), a roller shaft (2), a fixing block (3) and a mounting plate (4); the roll shaft (2) is fixed on the mounting plate (4) through the fixing block (3) at two ends, the metal roll sheet (1) is composed of an inner ring (11), a supporting layer (12), an outer ring (13) and rolling bodies (14), the inner ring (11) is assembled on the roll shaft (2) through the rolling bodies (14), the outer ring (13) is a ring body made of flexible metal and is positioned on the outer side of the inner ring (11), the outer ring (13) is connected with the inner ring (11) through the supporting layer (12), when the metal press roll rolls the thermoplastic composite material, the outer ring (13) is in contact with the thermoplastic composite material and is pressed, the outer ring (13) and the supporting layer (12) are deformed under stress, and therefore the contact area between the outer ring (13) and the thermoplastic composite material is increased; the specific design method of the metal compression roller comprises the following steps:
the method comprises the following steps: the equivalent elastic coefficient of each position of the roller sheet is recorded as k, the value of k is mainly determined by the thickness of the outer ring of the roller sheet, the rigidity of the metal sheets of the supporting layer and the number of the metal sheets of the supporting layer, and the quantity, the thickness and the shape of the metal sheets of the supporting layer and the thickness of the outer ring need to be changed due to the non-continuity of the structure, so that the fluctuation of the value of k at each position of the roller sheet is caused
The pressure provided by each part of the roller sheet is ensured to be uniform;
step two: recording the width of the roller sheet as a, the excircle radius of the roller sheet as r, and contacting the roller sheet with the composite material or the mold to generate radial displacement delta r of the outer ring of the roller sheet under the action of an external force with the magnitude of F, and then forming and compacting the contact length
The contact area is S ═ a × l, the forming average pressure Sigma provided by the roll sheet is F ÷ S, and the outer ring diameter and the width of the roll sheet are adjusted to obtain the formed compaction contact area S and the compaction pressure Sigma;
step three: and (3) calculating and analyzing the stress of each part of the roller sheet under the action of the external force F, if the miss stress of a certain part is greater than the fatigue strength of the material, changing the material and the size of the roller sheet, and repeating the first step and the second step until the roller sheet can meet the requirements of preset pressure uniformity, compaction contact area and compaction pressure.
2. The method for designing a metal press roll for in-situ forming of thermoplastic composite material as claimed in claim 1, wherein: fixed block (3) have two, be located roller (2) both ends respectively, every fixed block (3) all include fixed part (31), lower fixed part (32) and retaining member (33), the tip of roller (2) can install between corresponding last fixed part (31) and lower fixed part (32) to by retaining member (33) lock die fixedly, last fixed part (31) and mounting panel (4) fixed connection.
3. The method for designing a metal press roll for in-situ forming of thermoplastic composite material as claimed in claim 2, wherein: the upper fixing part (31) and the lower fixing part (32) are fixedly connected into a whole through screws or welding or buckling.
4. The method for designing a metal press roll for in-situ forming of thermoplastic composite material as claimed in claim 3, wherein: the upper fixing part (31) and the mounting plate are fixedly connected into a whole through screws or welding or buckling.
5. The method for designing a metal press roll for in-situ forming of thermoplastic composite material as claimed in claim 4, wherein: the supporting layer (12) is composed of a plurality of metal sheets, the metal sheets are arranged between the inner ring (11) and the outer ring (13) at equal intervals, one end of each metal sheet is connected with the inner ring (11), the other end of each metal sheet is connected with the outer ring (13), and each metal sheet is an arc sheet or a linear sheet or a wavy sheet or a spiral sheet which is scattered along the radial direction.
6. The method for designing a metal press roll for in-situ forming of thermoplastic composite material as claimed in claim 1, wherein: the outer ring (13) is made of 6061 aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110348180.2A CN113103618B (en) | 2021-03-31 | 2021-03-31 | Metal compression roller for in-situ forming of thermoplastic composite material and design method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110348180.2A CN113103618B (en) | 2021-03-31 | 2021-03-31 | Metal compression roller for in-situ forming of thermoplastic composite material and design method thereof |
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| CN113103618A CN113103618A (en) | 2021-07-13 |
| CN113103618B true CN113103618B (en) | 2022-02-11 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356019A (en) * | 2019-06-18 | 2019-10-22 | 西安交通大学 | A kind of large deformation flexible pressing device for automatic fiber placement |
| CN110666336A (en) * | 2019-09-29 | 2020-01-10 | 重庆科技学院 | Rolling type inner support system for friction stir welding |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7810539B2 (en) * | 2005-08-25 | 2010-10-12 | Ingersoll Machine Tools, Inc. | Compaction roller for a fiber placement machine |
| KR101759364B1 (en) * | 2009-10-13 | 2017-07-18 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | A contact nip roll and a system for nipping a web |
| FR3036152B1 (en) * | 2015-05-12 | 2017-06-02 | Messier Bugatti Dowty | TRAINING ROLL. |
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2021
- 2021-03-31 CN CN202110348180.2A patent/CN113103618B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356019A (en) * | 2019-06-18 | 2019-10-22 | 西安交通大学 | A kind of large deformation flexible pressing device for automatic fiber placement |
| CN110666336A (en) * | 2019-09-29 | 2020-01-10 | 重庆科技学院 | Rolling type inner support system for friction stir welding |
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| CN113103618A (en) | 2021-07-13 |
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