Forming die for preparing carbon fiber composite transmission shaft film disc structure

Abstract

The invention relates to the technical field of composite material transmission shaft manufacturing process equipment, and provides a forming mold for preparing a carbon fiber composite material transmission shaft film disc structure, the forming mold comprises an inner mold and an outer mold, the inner mold is used for winding prepreg cloth to form a shaft body; and the outer mold is used for compacting local parts of the prepreg cloth to form a film disc. According to the forming mold, the inner mold is composed of the core mold and the inner ring mold, the outer ring mold of the outer mold is composed of the two outer ring half molds, all the mold assemblies can be detached, assembling is convenient, and demolding convenience is improved; when the mold is applied, the prepreg cloth for forming the transmission shaft can be arranged on the inner mold, and the prepreg cloth is compacted by the outer mold to layer the film disc, so that the integrated preparation of the film disc and the shaft pipe is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material transmission shaft manufacturing process equipment, and in particular to a molding die for preparing a carbon fiber composite material transmission shaft diaphragm disc structure. Background Art

[0002] Couplings are also called couplings. They are mechanical parts used to firmly connect the driving shaft and the driven shaft in different mechanisms so that they rotate together and transmit motion and torque. Sometimes they are also used to connect shafts with other parts (such as gears, pulleys, etc.). They are usually composed of two halves, which are connected by keys or tight fits, fastened to the two ends of the shafts, and then connected in some way. Couplings can compensate for the offset (including axial offset, radial offset, angular offset or combined offset) between the two shafts due to inaccurate manufacturing and installation, deformation during operation or thermal expansion, as well as mitigate impact and absorb vibration.

[0003] The invention patent with the existing authorization announcement number CN109109340B discloses a method for preparing a composite shaft, comprising the following steps: 1. impregnating aramid fiber woven cloth or carbon fiber cloth in thermosetting resin to obtain prepreg; 2. winding the prepreg on an expansion shaft; 3. assembling the cylindrical cavity and the expansion shaft wrapped with the prepreg, rotating the expansion shaft arm, sending it into a hot press tank for molding, and finally opening the tank, shrinking the expansion shaft, demoulding, and completing the preparation of the composite shaft;

[0004] For example, the preparation method in the above scheme needs to control the pressure several times during the preparation process, and relies on the expansion effect to realize the preparation of the shaft. The preparation process is not only cumbersome, but also limited by the expansion molding, and is not suitable for pipes with unequal diameter structures. Therefore, it is difficult to prepare shaft parts with complex structures.

[0005] The carbon fiber composite transmission shaft with a diaphragm structure can achieve centering compensation through the deformation of the diaphragm structure, without the need for a metal diaphragm coupling, thereby reducing the weight of the shaft system and improving the centering accuracy and transmission performance. However, the existing carbon fiber composite transmission shaft tube is generally prepared by a winding process, which makes it difficult to achieve the integrated preparation of the diaphragm and the shaft tube;

[0006] The present invention is aimed at a carbon fiber composite material transmission shaft containing a membrane disc structure, and proposes a prepreg cloth winding tube preparation method and a molding mold for a carbon fiber composite material membrane disc structure, so as to solve the problem that other molding processes such as existing winding cannot complete the preparation of the membrane disc shaft tube integrated structure. Summary of the invention

[0007] In view of this, the present invention proposes a transmission shaft preparation method, a transmission shaft and a preparation mold thereof with a simple preparation process and not restricted by part shape, thereby solving the problem that the existing preparation method has a cumbersome process and is difficult to prepare parts with complex structures.

[0008] The technical solution of the present invention is achieved in this way:

[0009] In one aspect, the present invention provides a forming mold for preparing a carbon fiber composite material transmission shaft diaphragm structure, comprising an inner mold and an outer mold, wherein:

[0010] The inner mold is used to wind the prepreg to form the shaft body;

[0011] The outer mold is used to compact the prepreg locally to form a membrane disc.

[0012] On the basis of the above technical solution, preferably, the inner mold includes a core mold and an inner ring mold, and the outer mold includes an outer ring mold, wherein:

[0013] The core mold is a tubular structure, the inner ring mold is arranged in the middle section of the core mold, and the inner ring mold is a water-soluble mold;

[0014] The outer ring mold is sleeved on the core mold and buckled with the inner ring mold;

[0015] The core mold is used to fit the prepreg tube sheets to form the shaft body;

[0016] The inner ring mold and the outer ring mold are used to fit the prepreg tube piece, the prepreg patch piece and the prepreg ring piece to form a membrane disc.

[0017] On the basis of the above technical solution, preferably, the outer ring mold includes two outer ring half molds, the two outer ring half molds are buckled on the inner ring mold, and the two outer ring half molds are connected in a detachable manner.

[0018] On the basis of the above technical solution, preferably, the core mold and the outer ring half mold are made of P20 mold steel.

[0019] On the basis of the above technical solution, preferably, the inner ring mold uses model sand as solute and polyvinyl alcohol, polyacrylamide or polyethylene oxide as solution, mixed and solidified to form.

[0020] On the basis of the above technical solution, preferably, the surfaces of the core mold, the inner ring mold and the outer ring mold are coated with a release agent and wrapped with a release cloth or release paper.

[0021] On the basis of the above technical solution, preferably, the core mold and the inner ring mold are interference fit.

[0022] Compared with the prior art, the transmission shaft preparation method, transmission shaft and preparation mold of the present invention have the following advantages:

[0023] Beneficial effects:

[0024] (1) In the present molding die, the inner die is composed of a core die and an inner ring die, while the outer ring die of the outer die is composed of two outer ring half-dies. The above-mentioned die components can be disassembled to facilitate assembly and improve the convenience of demolding. When it is used, the prepreg cloth used to form the transmission shaft can be set on the inner die, and the prepreg cloth is compacted by the outer die to form a model layer of membrane disc, thereby realizing the preparation of the membrane disc shaft tube integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a diagram showing the layout structure of the prepreg during the preparation of the present invention;

[0027] Figure 2 A stereoscopic view of a forming mold for preparing a carbon fiber composite material transmission shaft diaphragm disc structure according to the present invention;

[0028] Figure 3 A stereoscopic view of the opened structure of a forming mold for preparing a carbon fiber composite material transmission shaft diaphragm disc structure of the present invention;

[0029] Figure 4 A cross-sectional view of a forming mold for preparing a carbon fiber composite material transmission shaft diaphragm disc structure of the present invention;

[0030] In the figure: 1, shaft body; 2, membrane disk; 11, core mold; 12, inner ring mold; 13, core shaft; 21, outer ring mold; 211, outer ring half mold; 100, prepreg tube piece; 200, prepreg patch piece; 300, prepreg ring piece; 1001, notch. DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figures 1 to 4 As shown, the transmission shaft of the present invention comprises a shaft body 1 and a diaphragm disc 2;

[0033] like Figure 1 and Figure 4As shown, the shaft body 1 is a cylindrical structure, and a membrane disc 2 is provided in the middle section of the shaft body 1; the shaft body 1 is formed by curing the prepreg tube sheet 100, and the membrane disc 2 is formed by curing the prepreg tube sheet 100, the prepreg patch sheet 200 and the prepreg ring sheet 300;

[0034] As described above, in this transmission shaft structure, the diaphragm disc 2 and the shaft body 1 are formed at one time using the prepreg tube sheet 100, the prepreg patch sheet 200 and the prepreg ring sheet 300, and the whole structure is an integrated structure. In this way, the centering compensation of the transmission shaft can be achieved by relying on the diaphragm disc 2, and the diaphragm assembly step during preparation is omitted. The integrated transmission shaft has better structural strength and application stability, and is lighter as a whole, which effectively improves its application range;

[0035] When preparing the transmission shaft, the shaft body 1 and the diaphragm disc 2 are formed at one time, and then the flange and the bushing in the flange hole are installed.

[0036] like Figure 1 As shown, the transmission shaft preparation method of the present invention comprises the following steps:

[0037] S1. Prepare the molding mold, clean and preheat the surface of the inner mold and the outer mold, then spray the release agent on the inner mold and the outer mold, and lay out the release cloth or release paper;

[0038] S2, winding the multi-layer prepreg onto the inner mold;

[0039] S3, compacting the multiple layers of prepreg and wrapping them with polypropylene tape to exhaust the air between the layers;

[0040] S4, remove the polypropylene tape, and then assemble the outer mold onto the inner mold to cooperate with the inner mold to clamp the prepreg;

[0041] S5, placing the assembled inner mold, outer mold and prepreg into an air bag for sealing, evacuating the air bag, and then sending it into a curing furnace for curing, heating and molding;

[0042] S6. After curing is completed, demoulding is performed, and the molded transmission shaft is removed for subsequent processing.

[0043] As in the above preparation steps, the transmission shaft blank is constructed by wrapping the inner mold with prepreg cloth, and the blank is clamped and fixed by the outer mold, which is conducive to ensuring the structure of the transmission shaft after molding. It can be subsequently molded by heating and curing without repeated heating and pressure adjustment. It has the advantages of fast and convenient molding and is suitable for molding of transmission shafts with complex structures.

[0044] At the same time, the prepreg is wrapped with polypropylene tape, and the inner mold, the prepreg constituting the transmission shaft and the outer mold are vacuum sealed together through an air bag. This can effectively ensure that the multiple layers of prepreg are closely fitted without delamination, which is beneficial to improving the molding quality.

[0045] Step S2 includes:

[0046] S21, cutting the prepreg to form a prepreg tube sheet 100, a prepreg patch sheet 200 and a prepreg ring sheet 300;

[0047] S22, cutting a plurality of notches 1001 along a straight line on the middle section of the prepreg pipe sheet 100;

[0048] S23, winding the prepreg pipe sheet 100 onto the inner mold, bending the middle portion with the notch 1001 cut therein to form an expanded diameter structure;

[0049] S24, setting the prepreg patch 200, filling the prepreg patch 200 into the notch 1001, and connecting it with the prepreg pipe piece 100;

[0050] S25 , setting the prepreg ring sheet 300 , and attaching the prepreg ring sheet 300 to the prepreg patch sheet 200 and the prepreg tube sheet 100 flush with the side surface of the prepreg patch sheet 200 .

[0051] As in the above-mentioned prepreg processing steps, the prepreg is divided into three parts: prepreg tube sheet 100, prepreg patch sheet 200 and prepreg ring sheet 300, so as to form different parts of the transmission shaft;

[0052] The notch 1001 is cut out on the middle section of the prepreg tube sheet 100, so that the part of the prepreg tube sheet 100 can be bent and formed conveniently. After forming, the part corresponds to the membrane disc 2 of the transmission shaft. At the same time, the notch 1001 needs to be blocked by the prepreg patch 200, and the prepreg ring sheet 300 is used to stick and strengthen this part, so as to form a complete membrane disc 2 after curing.

[0053] like Figures 2 to 4 As shown, the molding die includes an inner die and an outer die, wherein the inner die is used to wind the prepreg to form the shaft body 1; the outer die is used to compact the part of the prepreg to form the membrane disc 2;

[0054] In the preparation mold of the present invention, the inner mold includes a core mold 11 and an inner ring mold 12, and the outer mold includes an outer ring mold 21, wherein the core mold 11 is a tubular structure, the inner ring mold 12 is arranged in the middle section of the core mold 11, and the inner ring mold 12 is a water-soluble mold; the outer ring mold 21 is sleeved on the core mold 11 and buckled with the inner ring mold 12; the core mold 11 is used to fit the prepreg tube piece 100 to form the shaft body 1; the inner ring mold 12 and the outer ring mold 21 are used to fit the prepreg tube piece 100, the prepreg patch piece 200 and the prepreg ring piece 300 to form the membrane disc 2;

[0055] In order to ensure positioning, a mandrel 13 is inserted into the end of the core mold 11;

[0056] As in the above structure, when preparing the transmission shaft, the mandrel 13 is first inserted into the core mold 11, and the inner ring mold 12 is placed on the core mold 11, and then the prepared prepreg pipe sheet 100 is covered on the core mold 11, and the portion with the notch 1001 corresponds to the end of the inner ring mold 12;

[0057] The portion of the prepreg pipe segment 100 with the notch 1001 corresponds to the inner ring mold 12 to form an expanded diameter section, and then the notch 1001 is filled with the prepreg patch 200, and then the prepreg ring piece 300 is used to connect the prepreg pipe segment 100 and the prepreg patch 200, so as to improve the structural strength;

[0058] Preferably, after the notch in the middle section of the prepreg pipe sheet 100 is filled and reinforced, the end of the prepreg pipe sheet 100 is shaped to keep it flat, so as to avoid interference with the installation of the prepreg ring sheet 300 on the middle section of the prepreg pipe sheet 100;

[0059] After completing the above steps, the outer ring mold 21 is installed, which is assembled corresponding to the inner ring mold 12 to compress the position where the notch 1001 is set in the middle section of the prepreg pipe sheet 100, and the corresponding prepreg patch 200 and prepreg ring sheet 300, and this position is cured to form a membrane disc 2;

[0060] In order to facilitate demoulding after molding, the inner ring mold 12 adopts a water-soluble mold;

[0061] After completing the above processes, it is compacted, wrapped with polypropylene tape and air bag, and then heat cured in a heat curing oven until it is formed and demoulded.

[0062] Specifically, the surfaces of the core mold 11, the inner ring mold 12 and the outer ring mold 21 are coated with a release agent and wrapped with a release cloth or release paper;

[0063] Specifically, the inner ring mold 12 is formed by using model sand as a solute and mixing with polyvinyl alcohol, polyacrylamide or polyethylene oxide as a solution and solidifying; the core mold 11 and the outer ring half mold 211 are made of P20 mold steel.

[0064] During molding, in order to ensure structural stability, the core mold 11 and the inner ring mold 12 are interference fit, so as to ensure the relative position accuracy between the mold parts.

[0065] like Figure 3 As shown, the outer ring mold 21 includes two outer ring half molds 211, and the two outer ring half molds 211 are buckled on the inner ring mold 12, and the two outer ring half molds 211 are connected in a detachable manner;

[0066] As in the above structure, in order to improve the convenience of installing the outer ring mold 21, the outer ring mold 21 adopts a half ring structure;

[0067] When assembling the outer ring mold 21, the two outer ring half molds 211 are installed corresponding to the inner ring mold 12. At this time, the outer ring half mold 211 will buckle the part with the notch 1001 in the middle section of the prepreg pipe piece 100, as well as its corresponding prepreg patch 200 and prepreg ring piece 300, and then the two outer ring half molds 211 are locked and fixed.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 forming die for preparing a carbon fiber composite material transmission shaft diaphragm structure, characterized in that: It includes inner mold and outer mold, among which, The inner mold is used to wind the prepreg to form a shaft body (1); The outer mold is used to compact a part of the prepreg to form a membrane disc (2).

2. The molding die according to claim 1, characterized in that: The inner mold comprises a core mold (11) and an inner ring mold (12), and the outer mold comprises an outer ring mold (21), wherein: The core mold (11) is a tubular structure, the inner ring mold (12) is arranged in the middle section of the core mold (11), and the inner ring mold (12) is a water-soluble mold; The outer ring mold (21) is sleeved on the core mold (11) and is buckled with the inner ring mold (12); The core mold (11) is used to bond the prepreg pipe sheet (100) to form the shaft body (1); The inner ring mold (12) and the outer ring mold (21) are used to bond the prepreg tube sheet (100), the prepreg patch sheet (200) and the prepreg ring sheet (300) to form a membrane disk (2).

3. The molding die according to claim 2, characterized in that: The outer ring mold (21) comprises two outer ring half molds (211), the two outer ring half molds (211) are buckled on the inner ring mold (12), and the two outer ring half molds (211) are connected in a detachable manner.

4. The molding die according to claim 3, characterized in that: The core mold (11) and the outer ring half mold (211) are made of P20 mold steel.

5. The molding die according to claim 2, characterized in that: The inner ring mold (12) is formed by mixing model sand as a solute and polyvinyl alcohol, polyacrylamide or polyethylene oxide as a solution and solidifying.

6. The molding die according to claim 2, characterized in that: The surfaces of the core mold (11), the inner ring mold (12) and the outer ring mold (21) are coated with a release agent and wrapped with a release cloth or release paper.

7. The molding die according to claim 2, characterized in that: The core mold (11) and the inner ring mold (12) are interference fit.

Images