Preparation method of composite material thrust rod

Abstract

The invention relates to a preparation method of a composite material thrust rod. The preparation method comprises the following steps: 1, performing three-dimensional weaving on a continuous fiber strip-shaped material to form a plurality of groups of connected reinforcement bodies; 2, integrally cutting the reinforcing body into single reinforcing bodies matched with the product in size; and thirdly, the reinforcing body and the steel sleeve are pre-embedded into a mold, the reinforcing body and the steel sleeve are taken out after resin materials are injected and formed, then the spherical hinge is pressed, and the composite thrust rod is formed. The whole reinforcement is woven in a three-dimensional weaving mode, the problem of large-batch and continuous production of the reinforcement is solved, the preparation cost of the high-strength composite material thrust rod reinforcement is greatly reduced, the production and manufacturing procedures of the thrust rod are simplified, the cost of the composite material thrust rod is greatly reduced on the premise that the mechanical performance is guaranteed, and the production efficiency of the thrust rod is improved. And the composite material thrust rod has higher market competitiveness. And on the premise that the weight of the formed thrust rod is obviously reduced, the large bearing capacity and the excellent fatigue performance can be achieved, low-cost and large-batch production and manufacturing can be achieved, and low-carbon and environment-friendly manufacturing of automobiles is achieved.

Description

Technical Field

[0001] The invention relates to a method for preparing a thrust rod, in particular to a method for preparing a thrust rod made of a composite material. Background Art

[0002] The thrust rod is one of the important parts of the automobile chassis. It connects the frame and the axle, transmits traction or braking force, and other lateral forces, etc. At the same time, it can also position the axle and frame, and also play a buffering role. At present, the mainstream thrust rods are mainly steel thrust rods, which are heavy and difficult to meet the lightweight requirements of the automotive industry, especially new energy vehicles. Therefore, composite materials are used to make thrust rods to greatly reduce the weight. However, since the thrust rods made of current composite materials are generally inefficient and costly, they cannot be used in large quantities.

[0003] For example, the invention patent with publication number CN113043527B and the name of “A method for manufacturing a lightweight composite thrust rod” previously applied by the applicant adopts a strip-shaped continuous fiber reinforced thermoplastic material with the same width as the reinforcement body to be wound along the center body to form the shape of the reinforcement body. Although the thrust rod formed in this way can meet both lightweight requirements and strength requirements, its reinforcement bodies need to be wound individually, which is less efficient.

[0004] As an extension of two-dimensional weaving, three-dimensional weaving can be used for the weaving of composite materials. It has high weaving efficiency and the formed products have strong load resistance, thus greatly improving the efficiency of composite product manufacturing. Summary of the invention

[0005] In view of the problem that the current preparation of composite material thrust rods is inefficient and costly, the present invention proposes a method for preparing composite material thrust rods. The method utilizes a three-dimensional weaving method to weave multiple groups of thrust rod reinforcements as a whole at one time, which greatly improves the preparation speed of the reinforcements and thus can greatly improve the production efficiency of the thrust rods.

[0006] The technical means adopted by the present invention to solve the above problems are: a method for preparing a composite thrust rod, the first step: forming a plurality of connected reinforcement bodies by three-dimensional weaving of continuous fiber strip materials; the second step: cutting the reinforcement body into a single reinforcement body of suitable product size; the third step: pre-embedding the reinforcement body and the steel sleeve into a mold, injecting resin material to form, taking out, and then press-fitting into a ball joint to form a composite thrust rod. The three-dimensional weaving is used to weave multiple reinforcement structures at one time, which greatly improves the production speed of the reinforcement body.

[0007] Furthermore, the reinforcement body is an annular structure as a whole, and its outer circumference is equal to the outer circumference of the thrust rod, and its width is the sum of the widths of multiple thrust rods, so that the reinforcement body as a whole can be cut into individual reinforcement bodies.

[0008] Furthermore, in the first step, the continuous fiber strip material uses an impregnated thermoplastic strip material. After weaving, the thermoplastic resin in the thermoplastic strip material is heated to melt, and then the reinforcement is pressed as a whole, and after cooling and solidification, the shape of multiple groups of connected reinforcements is formed. The impregnated material is used for weaving, so it can be heated and solidified.

[0009] Furthermore, when the heated reinforcement body is pressed as a whole, an inner core mold having the same peripheral shape as the reinforcement body but different width is placed inside the reinforcement body as a whole, and an outer core mold having the same internal space shape as the reinforcement body but different width is used to extrude the outer periphery of the reinforcement body as a whole. The reinforcement body as a whole is formed into a shape of multiple groups of connected reinforcement bodies through the extrusion of the inner core mold and the outer core mold.

[0010] Furthermore, in the first step, the continuous fiber strip material adopts a woven inorganic fiber cloth, and the woven inorganic fiber cloth is cut into long strips and then three-dimensionally woven.

[0011] Furthermore, in the first step, the three-dimensionally woven reinforcement body as a whole is in the shape of a thrust rod having a width greater than that of a single reinforcement body.

[0012] Furthermore, in the first step, the reinforcement body after three-dimensional weaving is an amorphous ring as a whole.

[0013] Furthermore, in the third step, the injected resin is a thermoplastic resin polymer.

[0014] Furthermore, the thermoplastic resin polymer is injected into the mold by injection molding.

[0015] Furthermore, in the third step, the injected resin is a thermoplastic resin monomer.

[0016] The beneficial effects of the present invention are: 1. The present invention solves the problem of large-scale and continuous production of reinforcements by weaving the reinforcement body in a three-dimensional weaving manner, greatly reduces the preparation cost of high-strength composite thrust rod reinforcements, simplifies the production and manufacturing process of the thrust rod, and greatly reduces the cost of composite thrust rods while ensuring mechanical properties, making composite thrust rods more competitive in the market.

[0017] 2. The reinforcement of the present invention is a woven annular whole. The thrust rod after molding can achieve large load-bearing capacity and excellent fatigue performance while ensuring significant weight reduction. It can also be manufactured in large quantities at low cost, thus enabling low-carbon and green manufacturing of automobiles.

[0018] 3. The present invention adopts a three-dimensional weaving method to form a reinforcement body, which greatly improves the manufacturing speed of the reinforcement body compared with the method of winding a single reinforcement body separately. Moreover, the three-dimensional weaving can select a wider range of strip materials, and the selection of the width of the strip material is more flexible, which is more conducive to reducing the cost of the thrust rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the manufacturing process of the reinforcement body in Example 1; Figure 2 This is a schematic diagram of the structure of the thermoplastic resin injected into the reinforcement body and the steel sleeve in Example 1; Figure 3 This is a schematic diagram of the steel sleeve structure of Example 1; Figure 4 This is a schematic diagram of the ball joint structure of Example 1; Figure 5 This is a schematic diagram of the structure of the thrust rod after forming in Example 1; Figure 6 This is a schematic diagram of the structure of the continuous fiber strip material of Example 2; In the figure: 1. reinforcement as a whole, 2. reinforcement, 3. thermoplastic resin, 4. steel sleeve, 5. ball joint, 6. composite material rod, 7. inorganic fiber cloth. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings. The accompanying drawings are only for illustrative purposes and are only schematic diagrams, not actual pictures, and cannot be understood as limiting the present patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted. Embodiment 1

[0021] A method for preparing a composite material thrust rod, such as Figure 2-Figure 5 As shown, the prepared thrust rod comprises a composite rod body 6 and a ball joint 5 formed by vulcanization of rubber and metal, wherein the ball joint 5 is press-fitted into the composite rod body 6. The composite rod body 6 comprises a reinforcement 2 and a metal steel sleeve 4 bonded by a thermoplastic resin 3.

[0022] like Figure 1-Figure 5 As shown, the specific preparation method is as follows: Step 1: First, the pre-impregnated unidirectional tape is three-dimensionally woven in 1×1, 2×2, 3×3 and other weaving methods to form a ring-shaped reinforcement body 1, and the outer circumference of the reinforcement body 1 in the ring direction after forming is equal to the outer circumference of the thrust rod reinforcement body 2, and the shape in the ring direction is the same as the shape of the reinforcement body 2, and the width W1 of the reinforcement body 1 is much larger than the width W2 of the reinforcement body 2, so that the reinforcement body 1 becomes a structure of multiple connected reinforcement bodies 2. In this way, it is equivalent to weaving multiple reinforcement bodies 2 at a time by three-dimensional weaving, and the operation can be continuous, which greatly improves the production efficiency of the reinforcement body 2.

[0023] Then, the reinforcement body 1 is heated as a whole, and an inner core mold whose outer circumference shape is the same as the outer shape of the reinforcement 2 and whose width matches the width W1 of the reinforcement body 1 is set inside the reinforcement body 1, and an outer core mold whose inner circumference shape is the same as the outer shape of the reinforcement 2 and whose width matches the width W1 of the reinforcement body 1 is set outside the reinforcement body 1. The reinforcement body 1 is pressed by the inner core mold and the outer core mold, so that the impregnated material in the reinforcement body 1 is melted and combined, and after cooling and solidification, a fixed shape of multiple connected reinforcement bodies 2 is formed.

[0024] Step 2: According to the width of the thrust rod product, the reinforcement body 1 is cut into individual reinforcement bodies 2 that match the product size. A large number of reinforcement bodies 2 can be formed at one time.

[0025] Step 3: embed the single reinforcement 2 and the metal steel sleeve 4 as inserts in the mold, and then inject the thermoplastic resin polymer material into the mold to form an injection-molded composite rod body 6. Take the composite rod body 6 out of the mold, remove the burrs, and press-fit the rubber metal ball joint 5 at both ends to form a composite thrust rod product.

[0026] like Figure 2 As shown, after the injection molding is completed, the thermoplastic resin polymer material combines the steel sleeves 4 at both ends and the external reinforcement body 2 into a whole, and various reinforcing ribs can also be formed inside the reinforcement body 2 to meet the performance requirements of the thrust rod. Embodiment 2

[0027] like Figure 6 As shown, the strip material used in the three-dimensional weaving in the first step of this embodiment is an inorganic fiber cloth formed by plane weaving, such as a thin and long strip of glass fiber cloth. And after the three-dimensional weaving is completed, it directly enters the second step for cutting. And in the third step, the thermoplastic resin used is a directly injected resin monomer. This is because the fibers in the reinforcement body 1 after three-dimensional weaving are not impregnated with resin, and a resin monomer with better flowability needs to be infiltrated into the surface of the inorganic fiber during the injection process to ensure the structural stability of the reinforcement.

[0028] Of course, in the third step of the first embodiment, a resin monomer with better flowability may also be injected.

[0029] In the above embodiment, when three-dimensional weaving is performed in the first step, the outer circumference of the reinforcement body 1 after molding in the annular direction only needs to be equal to the outer circumference of the single reinforcement body 2, and its shape in the annular direction does not necessarily need to be the same as the outer shape of the reinforcement body 2. As in Example 1, the shape of the reinforcement body 1 in the annular direction after pressing will be the same as the outer shape of the reinforcement body 2. However, the reinforcement body 1 in Example 2 does not need to be pressed, so it is unshaped before being placed in the mold, and is supported by the mold core into the shape of the reinforcement body 2 when placed in the mold.

[0030] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A method for preparing a composite thrust rod, characterized in that: the first step is to form a plurality of connected reinforcement bodies (1) through three-dimensional weaving of continuous fiber strip materials; the second step is to cut the reinforcement body (1) into individual reinforcement bodies (2) of suitable product size; the third step is to embed the reinforcement body (2) and the steel sleeve (4) into a mold, inject resin material to form the reinforcement body, take it out, and then press-fit into a ball joint (5) to form a composite thrust rod.

2. The method for preparing a composite thrust rod according to claim 1, characterized in that: The reinforcement body (2) is an annular structure as a whole, its outer circumference is equal to the outer circumference of the thrust rod, and its width is the sum of the widths of the plurality of thrust rods.

3. The method for preparing a composite thrust rod according to claim 1, characterized in that: In the first step, the continuous fiber strip material is an impregnated thermoplastic strip material. After weaving, the thermoplastic resin in the thermoplastic strip material is heated to melt, and then the reinforcement body (1) is pressed as a whole. After cooling and solidification, the shape of multiple groups of connected reinforcement bodies (2) is formed.

4. The method for preparing a composite thrust rod according to claim 1, characterized in that: When pressing the heated reinforcement body (1), an inner core mold having an outer peripheral shape identical to the outer shape of the reinforcement body (2) but a different width is placed inside the reinforcement body (1), and an outer core mold having an inner space shape identical to the outer shape of the reinforcement body (2) but a different width is used to extrude the outer periphery of the reinforcement body (1).

5. The method for preparing a composite thrust rod according to claim 1, characterized in that: In the first step, the continuous fiber strip material is made of woven inorganic fiber cloth, which is cut into long strips and then three-dimensionally woven.

6. The method for preparing a composite thrust rod according to claim 1, characterized in that: In the first step, the three-dimensionally woven reinforcement body (1) as a whole is in the shape of a thrust rod having a width greater than that of a single reinforcement body (2).

7. The method for preparing a composite thrust rod according to claim 1, characterized in that: In the first step, the entire reinforcement body (1) after three-dimensional weaving is an amorphous ring.

8. The method for preparing a composite thrust rod according to claim 1, characterized in that: In the third step, the injected resin is a thermoplastic resin polymer.

9. The method for preparing a composite thrust rod according to claim 1, characterized in that: Thermoplastic resin polymers are injected into a mold using injection molding.

10. The method for preparing a composite material thrust rod according to claim 1, characterized in that: In the third step, the injected resin is a thermoplastic resin monomer.

Images