A composite material control arm hot press injection integrated molding die

Abstract

The application discloses a kind of composite control arm hot pressure injection integrated mould, including front mould and back mould, back mould is equipped with multiple inserts that are integrally V-shaped, positioning needle that can be pressed into insert with one end protruding the surface of insert, and shaping mechanism that plays a supporting role when hot pressing composite sheet, and back mould is located at the V-shaped junction of insert and is equipped with positioning hole, two ends are equipped with positioning cylinder, wherein insert and shaping mechanism form triangle shape, and positioning hole and two positioning cylinders are respectively located at three corners of triangle;The surface of front mould is provided with concave space matched with the shape of back mould.When molding, needle hole is provided in the composite sheet, the positioning needle passes through the needle hole to fix the composite sheet, and the shaping mechanism provides support for the composite sheet when hot pressing the composite sheet, to ensure that the composite sheet can be pressed into the final shape during hot pressing, so that the glue can flow between the composite sheet and the bushing, and the skeleton preforming and injection molding are completed on one set of mold, and the product quality is stable.

Description

Technical Field

[0001] This invention relates to a molding die for a composite material control arm, specifically to a hot-press injection molding die for an integrated composite material control arm. Background Technology

[0002] Vehicle weight is a crucial factor affecting the extended driving range of new energy vehicles. Component suppliers, vehicle manufacturers, and research institutions are all engaged in research on lightweighting technologies for new energy vehicles. The application of lightweighting technologies in new energy vehicles can not only reduce overall vehicle energy consumption but also effectively improve acceleration performance, braking performance, handling stability, ride comfort, and noise and vibration levels. Currently, the development of lightweighting in new energy vehicles increasingly focuses on the hybrid application of multiple materials. Among these, the hybrid application of continuous fiber-reinforced thermoplastic composites as the main load-bearing framework, with high-glass fiber engineering plastics playing a connecting, coordinating, and reinforcing role, shows the greatest promise.

[0003] For example, in the invention patent application CN202110177255.5, entitled "A Control Arm Molding Mold and Control Arm," previously published by the applicant, a V-shaped closed skeleton is first made using a strip of thermoplastic continuous fiber reinforced composite material. Then, the V-shaped closed skeleton is placed in an injection mold, and thermoplastic fiber reinforced composite material is used for high-pressure injection molding to fill the V-shaped closed skeleton and integrally injection molded to form the control arm. This method requires a separate pre-forming process, where the reinforcing skeleton is prepared in advance outside the injection mold, and then transferred to the injection mold for secondary injection molding, thus resulting in low efficiency.

[0004] For example, the invention patent application CN202110745630.1, entitled "A Composite Material Control Arm for Vehicles and Its Molding Mold," first prepares a carbon fiber composite plate, and then places the carbon fiber composite plate and the bushing together into a mold for injection molding. However, this method does not specifically explain how to maintain the accurate relative position of the carbon fiber composite plate and the bushing during the injection molding process, so it is impossible to know whether this method can produce a control arm that meets the requirements. Summary of the Invention

[0005] This invention addresses the current lack of detailed molds for the integrated hot-press injection molding of control arms by proposing a composite material control arm integrated hot-press injection mold. This mold achieves both pre-forming and injection molding of the frame through a single set of molds, and the produced control arms have stable quality that meets usage requirements.

[0006] The technical means adopted by this invention to solve the above problems is as follows: a composite material control arm hot-press injection molding mold, including a front mold and a rear mold. The rear mold is provided with multiple V-shaped inserts, a positioning pin with one end protruding from the surface of the insert and pressable into the insert, and a shaping mechanism that provides support during hot pressing of the composite sheet. The rear mold has positioning holes at the V-shaped connection of the inserts and positioning cylinders at both ends. The inserts and the shaping mechanism form a triangular shape, with the positioning holes and the two positioning cylinders located at the three corners of the triangle. The surface of the front mold has a concave space that matches the shape of the rear mold. During molding, pin holes are provided in the composite sheet, and the positioning pins pass through the pin holes to fix the composite sheet. During hot pressing of the composite sheet, the shaping mechanism provides support for the composite sheet, ensuring that the composite sheet can be pressed into the final shape during the hot pressing process.

[0007] Furthermore, the shaping mechanism includes a triangular slider with inclined surfaces on both sides of the top and an inclined slider with inclined surfaces on the sides. There are two inclined sliders. The two inclined surfaces of the triangular slider cooperate with the inclined surfaces of one of the inclined sliders, so that when the triangular slider is pushed, it pushes the two inclined sliders to the sides, and after the triangular slider retracts, the two inclined sliders can move closer to each other.

[0008] Furthermore, a guide rail is provided between the inclined surfaces of the triangular slider and the inclined slider, so that when the triangular slider retracts, it can drive the two inclined sliders to move closer to each other.

[0009] Furthermore, a support block is provided on the side of the inclined slider away from its inclined surface. When the inclined slider moves, it drives the support block to move together. The support block provides support during the hot pressing of the composite sheet, allowing the composite sheet to maintain a certain distance from the positioning cylinder during the injection molding process.

[0010] Furthermore, the support block is a quarter-circle in length and is located in the lower half-circle of the rear mold near the front mold side. During the hot pressing process, the end of the composite sheet rests against the support block.

[0011] Furthermore, a fixing post is provided between the inclined slider and the positioning cylinder, and a fixing hole is provided at the end of the fixing post facing the positioning cylinder. During the injection molding process, the bushing is fitted onto the positioning cylinder, and the positioning cylinder presses against the fixing hole, confining the bushing within the molding space.

[0012] Furthermore, the inner side of the support block rests against the outer side of the positioning cylinder, and when the triangular slider retracts and the two pairs of inclined sliders and the support block approach each other, the support block and the end of the positioning cylinder located at the positioning hole are aligned, together forming a molding space.

[0013] Furthermore, there are gaps between the inserts, through which the positioning pins pass. During injection molding, material flows through these gaps, forming reinforcing ribs inside the control arm after molding.

[0014] Furthermore, the inner and outer sides of the V-shaped integral formed by the insert are provided with multiple positioning blocks whose height is smaller than that of the insert. When the composite sheet is extruded by the front mold, the edge of the composite sheet contacts the positioning blocks, so that there is a certain gap between the composite sheet and the insert. During the injection molding process, the space between the composite sheet and the reinforcing rib is filled with rubber material, which increases the contact area between the rubber material and the composite sheet and improves the bonding force.

[0015] Furthermore, the surface of the positioning block away from the insert has a slope, and its bottom thickness is greater than its top thickness.

[0016] Furthermore, the rear mold is also equipped with a slider, and the positioning cylinder is set on the slider, which drives the positioning cylinder to move left and right.

[0017] Furthermore, the rear mold is also equipped with a spring and a positioning plate. One end of the positioning pin is fixed to the positioning plate, and the spring pushes the positioning plate to push the other end of the positioning pin out of the insert.

[0018] The beneficial effects of this invention are:

[0019] 1. The present invention provides a shaping mechanism at the V-shaped end of the insert. When the front mold pushes the composite sheet, the shaping machine provides support for the composite sheet, avoiding contact between the composite sheet and the bushing and ensuring the distance between the composite sheet and the bushing.

[0020] 2. By setting a triangular slider and a beveled slider to cooperate, the support block can be retracted after providing support during the hot pressing process, without affecting the subsequent injection molding process, and can also form the molding space during injection molding.

[0021] 3. The present invention sets positioning blocks on both sides of the insert. After the front mold extrudes the composite sheet, the positioning blocks separate the composite sheet from the side of the insert, so that the composite sheet is attached to the inner surface of the front mold. There is a gap between the composite sheet and the insert. During the injection molding process, the rubber material will not go to the outside of the composite sheet, but will fill the inside of the composite sheet. This ensures both the uniformity of the control arm shape and the bonding strength between the rubber material and the composite sheet.

[0022] 4. The present invention uses positioning pins that can extend out of the insert surface and be pressed into the insert to hold the composite sheet, so that the composite sheet can be positioned in the mold without falling off.

[0023] 5. The present invention uses a slider to move the positioning cylinder left and right, so that the bushing can be fitted onto the positioning cylinder before molding, and can be easily demolded after hot pressing injection molding. Attached Figure Description

[0024] Figure 1 Here is a schematic diagram and exploded view of the control arm structure in Embodiment 1;

[0025] Figure 2 This is a schematic diagram of the composite sheet structure in Example 1;

[0026] Figure 3 This is a schematic diagram of the triangular slider of the post-molding shaping mechanism in Embodiment 1 when it is pushed;

[0027] Figure 4 , Figure 6 and Figure 10 All Figure 3 Enlarged view of a portion;

[0028] Figure 5 for Figure 4 Enlarged view of a portion;

[0029] Figure 7 This is a schematic diagram of the inclined slider and the support block disposed thereon in Embodiment 1;

[0030] Figure 8 for Figure 7 Another angle diagram;

[0031] Figure 9 This is a schematic diagram of the triangular slider in Example 1;

[0032] Figure 11 This is a schematic diagram of the triangular slider of the post-molding mechanism in Embodiment 1 when it is retracted.

[0033] Figure 12 for Figure 11 Enlarged view of a portion;

[0034] Figure 13 This is a schematic diagram of the internal structure of the rear mold in Example 1;

[0035] Figure 14 for Figure 9 Schematic diagram of the structure after removing the baffle;

[0036] Figure 15 This is a schematic diagram of the baffle structure in Example 1;

[0037] Figure 16 This is a schematic diagram of the front mold structure in Example 1;

[0038] In the diagram: 1. Front mold, 2. Rear mold, 201. Insert, 202. Positioning pin, 203. Positioning hole, 204. Positioning block, 205. Positioning cylinder, 206. Fixing post, 2061. Fixing hole, 207. Slider, 208. Power mechanism, 210. Positioning plate, 211. Spring, 212. Baffle, 2121. Blind hole, 213. Shaping mechanism, 2131. Triangular slider, 2132. Beveled slider, 2133. Guide rail, 2134. Support block, 2135. Power component, 3. Control arm, 31. Reinforcing body, 32. Rubber body, 33. Bushing, 34. Ball pin, 341. Pin shaft, 300. Composite sheet, 301. Pin hole, 302. Pin hole, 303. Cutout. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Example 1

[0040] A composite material control arm hot-press injection molding die, such as Figure 1 As shown, the control arm 3 after molding in this embodiment is V-shaped in general, including a reinforcing body 31, a rubber body 32, a bushing 33 and a ball pin 34. There are two bushings 33, which are located at both ends of the V-shape of the control arm 3 respectively. One ball pin 34 is located at the V-shaped connection, and the pin shaft 341 of the ball pin 34 protrudes out of the rubber body 32.

[0041] Before molding, such as Figure 2 As shown, the outer wall of the V-shaped composite sheet 300 at the V-shaped connection has two notches 303 and the inner wall has one notch 303. The center of the V-shaped connection has a pin hole 301, and both walls have pin holes 302. During molding, the composite sheet 300, bushing 33 and ball pin 34 are first installed into the rear mold. Then, during the mold closing process, the front mold presses the composite sheet 300 into the shape of the reinforcement 31, and finally injection molding is performed.

[0042] like Figure 3 As shown, the rear mold of the one-piece molding die has inserts 201. Multiple inserts 201 are V-shaped, with gaps between them. During injection molding, the plastic material flows through these gaps, forming reinforcing ribs for the control arm. For example... Figure 4As shown, the rear mold is also provided with multiple positioning pins 202. Ideally, each positioning pin 202 passes through the insert 201, rather than through the gaps between the inserts 201, so as not to obstruct the flow of the adhesive in the gaps, thus not affecting the strength of the reinforcing ribs. During molding, the composite sheet 300 is hung on the positioning pins 202 through its pin holes 302. Positioning holes 203 are provided at the V-shaped connection formed by the inserts 201. The size and shape of the positioning holes 203 match the pin shaft 341 of the ball pin 34. During molding, the ball pin 34 is fixed to the rear mold after its pin shaft 341 is inserted into the positioning hole, and the composite sheet 300 is fitted onto the ball pin 34 through its pin hole 301.

[0043] like Figure 3 and Figure 11 As shown, a shaping mechanism 213 is provided at the V-shaped end formed by the insert 201. The insert 201 and the shaping mechanism 213 are roughly located at the three sides of an isosceles triangle, with the insert 201 located on two isosceles sides and the shaping mechanism 213 located on the other side. Figure 6 and Figure 12 As shown, the shaping mechanism 213 includes a triangular slider 2131 and two inclined sliders 2132. The triangular slider 2131 is connected to a power component 2135, such as a cylinder or hydraulic cylinder. Figure 9 As shown, the triangular slider 2131 has two bevels at its front end, as... Figure 7 As shown, the inclined slider 2132 has an inclined surface, and two triangular sliders 2132 are located on both sides of the triangular slider 2131, so that the inclined surfaces of the inclined sliders 2132 and the triangular sliders 2131 are opposite each other. Guide rails 2133 are provided between the two inclined surfaces of the triangular slider 2131 and the inclined surfaces of one of the inclined sliders 2132, so that when the triangular slider 2131 is sandwiched between the two inclined sliders 2132, it can drive the two inclined sliders 2132 to move simultaneously, but in perpendicular directions. In this embodiment, the power component 2135 cylinder is located at the end of the triangular slider 2131 away from its inclined surface. When the cylinder pushes the triangular slider 2131 forward, the triangular slider 2131 pushes the two inclined sliders 2132 to both sides; and when the cylinder drives the triangular slider 2131 to retract, the two inclined sliders 2132 simultaneously move closer to each other.

[0044] like Figure 7 and 8 As shown, the inclined slider 2132 has a support block 2134 at one end away from its inclined surface. The support block 2134 is in the shape of a quarter-circle ring, and is connected to the support block 2134 through one of its axial ends, as shown. Figure 3 and Figure 11As shown, when assembled onto the rear mold 2, the support block 2134 is located in the lower half of the rear mold 2 on the side facing the front mold 1. During the hot pressing process, the end of the composite sheet 300 can just rest against the outside of the support block 2134, so that the end of the composite sheet 300 can be pressed into an arc shape.

[0045] like Figure 3 and Figure 10 As shown, positioning cylinders 205 are provided at both ends of the V-shaped opening formed by the rear mold insert 201. The ends of the two positioning cylinders 205 that are close to each other are free ends. The bushing 33 is fitted onto the positioning cylinder 205 from the free end. The other end of the positioning cylinder 205 is connected to the slider 207. The slider 207 is connected to a power mechanism 208 that drives it to move left and right, thereby causing the two positioning cylinders 205 to move closer or further apart. The power mechanism 208 can be a cylinder or hydraulic cylinder, etc. At the same time, in order to prevent the bushing 33 from slipping off the positioning cylinder 205 during molding, such as... Figure 3 and Figure 11 As shown, two fixing posts 206 are provided between the two positioning cylinders 205, and the fixing post 206 has a fixing hole 2061 at one end facing the positioning cylinder. During molding, the power mechanism 208 pushes the slider 207 to make the free end of the positioning cylinder 205 press against the fixing hole 2061, thereby blocking the bushing 33 so that it will not fall off.

[0046] Moreover, such as Figure 12 As shown, the support block 2134 is located outside the fixed column 206 and can move axially along the fixed column 206, as... Figure 6 As shown, when the triangular slider 2131 moves forward, pushing the two inclined sliders 2132 to both sides, the free end of the support block 2134 extends beyond the fixed post 206, and the width of the extension is equal to the width of the end of the composite sheet 300, providing support for the end of the composite sheet 300. Figure 12 As shown, when the triangular slider 2131 retracts, it drives the two support blocks 2134 to move closer to the center. The ends of the support blocks 2134 are flush with the ends of the fixed posts 206, forming an injection space together.

[0047] like Figure 4 As shown, positioning blocks 204 are provided on both the inner and outer sides of the V-shaped straight edge formed by the insert 201, and as... Figure 5 As shown, the height H1 of the positioning block 204 is less than the height H2 of the insert 201, and the surface of the positioning block 204 away from the insert 201 is a slope, that is, the width W2 of the bottom of the positioning block 204 is greater than the width W1 of its top.

[0048] Furthermore, the positioning pin 202 protrudes from the surface of the insert 201 in the initial state, such as Figures 13-14As shown, the rear mold 2 has a positioning plate 210, a spring 211, and a baffle 212 inside. One end of the positioning pin 202 is mounted on one surface of the positioning plate 210 (not visible in the figure), and the other end passes through the rear mold core and extends from the surface of the insert 201. The spring 211 is located on the other side of the positioning plate 210 away from the positioning pin 202. Figure 15 As shown, the baffle 212 has a blind hole 2121. One end of the spring 211 extends into the blind hole 2121, and the other end pushes the positioning plate 210, so that there is a certain distance between the positioning plate 210 and the baffle 212 (of course, the depth of the blind hole 2121 must be less than the length of the spring 211 in the relaxed state). The positioning plate 210 also pushes the positioning pin 202. When the mold is closed, the front mold 1 encounters the positioning pin 202 and squeezes the spring 211, so that the positioning plate 210 moves toward the baffle 212, and the positioning pin 202 is pushed to be flush with the insert 201.

[0049] like Figure 16 As shown, there are three recessed groove-shaped spaces at the core of the front mold 1, which are roughly triangular in shape and together with the core of the rear mold 2, form the cavity space during hot-pressing injection molding. Moreover, since the movement of the triangular slider 2131 is carried out inside the mold after mold closing, the positions inside the front mold 1 corresponding to the movement space of the molding mechanism 213 should all be set as cavities.

[0050] The specific forming method of the control arm is as follows: First, the pin 341 of the ball pin 34 is inserted into the positioning hole 203 of the rear mold 2. The composite sheet 300 is hung on the positioning pin 202 through its pin hole 302, and the pin hole 301 of the composite sheet 300 is fitted onto the ball pin 34. The bushing 33 is fitted onto the positioning cylinder 205. Then, the power mechanism 208 pushes the slider 207 to move, so that the free end of the positioning cylinder 205 abuts against the fixing hole 2061. The power component 2135 pushes the triangular slider 2131 forward, and moves the inclined slider 2132 backward. Pushing from both sides, the support block 2134 extends beyond the fixed post 206; then the mold closes, and the front mold 1 extrudes the composite sheet 300 into the shape of the reinforcement 31. During extrusion, the support block 2134 provides support for the end of the composite sheet 300, so that the end of the reinforcement 31 and the bushing 33 maintain a certain distance; finally, the power component 2135 pulls the triangular slider 2131 back, and at the same time drives the two inclined sliders 2132 to move closer to each other, so that the free end of the support block 2134 is flush with the end of the fixed post 206, and then injection molding is performed.

[0051] During mold closing, the front mold 1 pushes the composite sheet 300, deforming its edges to form a concave reinforcement 31. In this process, the front mold 1 pushes the edge of the composite sheet 300 (i.e., the reinforcement 31) to the inclined surface a of the positioning block 204, ensuring a certain gap between the insert 201 at the V-shaped edge and the reinforcement 31. During injection molding, the plastic material flows into this gap and bonds with the reinforcement 31. By setting the side of the positioning block 204 away from the insert 201 as an inclined surface, the deformation of the composite sheet 300 is guided, reducing the precision requirements for the edge dimensions of the composite sheet 300. Therefore, the number and size of the positioning blocks 204 must ensure that the edge of the reinforcement 31 does not wrinkle and adhere to the insert 201, preventing the plastic material from flowing out of the reinforcement 31 during injection molding, while also ensuring sufficient distance between the positioning blocks 204 to allow the plastic material to fill and bond with the reinforcement 31. Meanwhile, the edge D ( ) of the composite sheet after deformation of 300 Figure 2 (as shown) and the bottom d of the rear mold 2 insert 201 ( Figure 8 There is still a certain distance between them (as shown), so that the adhesive can wrap the edge of the composite sheet 300.

[0052] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the invention, which should be defined by the claims.

Claims

1. A composite material control arm hot-press injection molding mold, comprising a front mold (1) and a rear mold (2), characterized in that: The rear mold (2) is provided with multiple inserts (201) that are V-shaped as a whole, a positioning pin (202) that protrudes from the surface of the insert (201) and can be pressed into the insert (201), and a shaping mechanism that supports the composite sheet (300) during hot pressing. The rear mold (2) is provided with a positioning hole (203) at the V-shaped connection of the insert (201) and a positioning cylinder (205) at both ends. The surface of the front mold (1) is provided with a concave space that matches the shape of the rear mold. The shaping mechanism (213) includes a triangular slider (2131) with inclined surfaces on both sides of the top and an inclined slider (2132) with inclined surfaces on the sides. There are two inclined sliders (2132), and the two inclined surfaces of the triangular slider (2131) respectively cooperate with the inclined surface of one inclined slider (2132). A guide rail (2133) is provided between the inclined surfaces of the triangular slider (2131) and the inclined slider (2132).

2. The composite material control arm hot-press injection molding mold as described in claim 1, characterized in that: The inclined slider (2132) has a support block (2134) on the side away from its inclined plane. When the inclined slider (2132) moves, it drives the support block (2134) to move together.

3. The composite material control arm hot-press injection molding mold as described in claim 2, characterized in that: The support block (2134) is a quarter-circle in length and is located in the lower half-circle of the rear mold (2) on the side of the front mold (1).

4. The composite material control arm hot-press injection molding mold as described in claim 1, characterized in that: A fixing post (206) is provided between the inclined slider (2132) and the positioning cylinder (205), and a fixing hole (2061) is provided at one end of the fixing post (206) facing the positioning cylinder (205).

5. The composite material control arm hot-press injection molding die as described in claim 1, characterized in that: The V-shaped whole formed by the insert (201) has multiple positioning blocks (204) with a height smaller than that of the insert (201) on both the inner and outer sides.

6. The composite material control arm hot-press injection molding die as described in claim 5, characterized in that: The surface of the positioning block (204) away from the insert (201) has a slope, and its bottom thickness is greater than its top thickness.

7. The composite material control arm hot-press injection molding die as described in claim 1, characterized in that: The rear mold (2) is also provided with a slider (207), and the positioning cylinder (205) is set on the slider (207). The positioning cylinder (205) is moved left and right by the slider (207).

8. The composite material control arm hot-press injection molding die as described in claim 1, characterized in that: The rear mold (2) is also equipped with a spring (211) and a positioning plate (210). One end of the positioning pin (202) is fixed to the positioning plate (210), and the spring (211) pushes the positioning plate (210) to squeeze the other end of the positioning pin (202) out of the insert (201).

Images