Molding process for automotive plastic parts with bevels

Abstract

This invention relates to a molding process for automotive plastic parts with inclined surfaces, comprising the following steps: ① Injection molding: The injection mold is installed on the injection molding machine, and the barrel temperature of the injection molding machine is controlled in stages to maintain the temperature of each section of the barrel within the range of 160℃~270℃. Then, the injection molding machine drives the injection mold to close, and plastic raw material is added to the hopper of the injection molding machine. Through the heating and pressurizing action of the injection molding machine, the molten plastic raw material in the barrel is injected into the mold cavity of the injection mold; ② Cooling and solidification: After injection molding, the product needs to be cooled to solidify; ③ Demolding and removal: After the product has cooled and solidified, the injection molding machine opens the injection mold, and the inclined core-pulling mechanism demolds the inclined surface of the product. After the product is ejected, it is removed. In this invention, the inclined core-pulling mechanism ensures reliable core pulling of the inclined surface, improves the demolding success rate, and increases the yield and aesthetics of the product.

Description

Technical Field

[0001] This invention relates to the molding process of automotive plastic parts with inclined surfaces, belonging to the field of automotive parts manufacturing. Background Technology

[0002] Automotive parts are the various units that make up a car and the products that serve the car. There are many types of automotive parts, and with the improvement of people's living standards, people's consumption of cars is increasing, and the market for automotive parts is growing larger and larger. In recent years, automotive parts manufacturers have also developed rapidly, and most automotive parts are produced using injection molding in current technology. However, automotive plastic parts often have complex structures such as holes, grooves, hollows, deep cavities, locking blocks, slots, slanted grooves, and angled locking blocks. For example, the base of the unlocking latch of a car seat back is hollow, and the base has slanted grooves, protrusions, fixing holes on the protrusions, and multiple mounting hole slots. Another example is the upper cover of the unlocking latch of a car seat back, which has slanted fixing blocks on both sides. These complex structures result in a large area of ​​tight contact between the plastic part and the cavity and core, leading to severe adhesion. Problems such as plastic part tearing and mold jamming caused by mold adhesion result in a high product defect rate. Furthermore, dealing with adhesion problems requires a 10-20 minute downtime, seriously affecting production efficiency. Meanwhile, inclined structures such as slanted grooves and inclined fixing blocks increase the difficulty of demolding. Forced demolding will inevitably lead to damage to the inclined structure, resulting in an increased defect rate. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a molding process for automotive plastic parts with inclined surfaces, which uses an inclined core-pulling mechanism to demold the inclined surfaces on the product.

[0004] To achieve the objective, the technical solution adopted by this invention is: The molding process for automotive plastic parts with beveled surfaces includes the following steps: ① Injection molding: The injection mold is installed on the injection molding machine, and the barrel temperature of the injection molding machine is controlled in sections to keep the temperature of each section of the barrel in the range of 160℃~270℃. Then the injection molding machine drives the injection mold to close, and the plastic raw material is added to the hopper of the injection molding machine. The plastic raw material enters the barrel located below the hopper. Through the heating and pressurization of the injection molding machine, the molten plastic raw material in the barrel is injected into the mold cavity of the injection mold. ② Cooling and solidification: After injection molding, the product needs to be cooled to solidify and take shape; ③ Demolding and removal: After the product has cooled and solidified, the injection molding machine opens the injection mold and uses the inclined core-pulling mechanism to demold the inclined surface on the product. After the product is completely ejected, it is removed.

[0005] As a further optimization of the above technical solution: the injection mold includes a first injection mold, the first injection mold includes a first moving mold, a first fixed mold and a first inclined core pulling mechanism, the first inclined core pulling mechanism includes a first slider slidably disposed on the first moving mold, a first inclined guide post passing through the first slider, the top of the first inclined guide post being connected to the first fixed mold, the first slider having an inclined slider forming part for forming the inclined surface on the product, a guide slider fixed on the first moving mold, the guide slider having an inclined I-shaped guide groove, the first slider I-shaped slidingly disposed in the I-shaped guide groove, the inclination angle of the I-shaped guide groove being the same as the inclination angle of the slider forming part.

[0006] After injection molding is completed, the first fixed mold and the first moving mold open, and the first slider moves outward under the guidance of the first inclined guide post to perform core pulling. The first slider pulls the core obliquely along the inclined I-shaped guide groove, so that the slider forming part on the first slider is separated from the product.

[0007] As a further optimization of the above technical solution: the injection mold also includes a third injection mold, which includes a third fixed mold, a third moving mold, and a second inclined core-pulling mechanism. The second inclined core-pulling mechanism includes a plurality of second inclined ejectors located on the third moving mold. The sides of the second inclined ejectors are provided with inclined ejector protrusions, and the bottom of the inclined ejector protrusions is provided with a forming inclined surface. The forming inclined surface corresponds to the inclined surface on the molded product. The third moving mold is provided with a plurality of second guide inclined holes. The rods of the second inclined ejectors pass through the second guide inclined holes. The third moving mold is provided with a third ejector plate, and the third ejector plate is provided with a plurality of second I-beam guide blocks. The second I-beam guide blocks are provided with inclined I-beam grooves. The inclination angle of the inclined I-beam grooves is the same as the inclination angle of the forming inclined surface. The bottom of the second inclined ejector is provided with a second I-beam mating block that slides with the inclined I-beam groove. When the mold is closed, the second I-beam mating block is located at the high point of the inclined I-beam groove.

[0008] As a further optimization of the above technical solution: after the third fixed mold and the third moving mold are closed to make the product injection molded, the third fixed mold and the third moving mold are separated. The third ejector plate drives the second I-shaped guide block and the second inclined ejector to move upward. The second inclined ejector moves obliquely upward along the second guide inclined hole. At the same time, the bottom of the second inclined ejector moves downward along the inclined I-shaped groove, so that the second inclined ejector ejects the product. The second inclined ejector gradually moves obliquely downward so that the molding inclined surface separates from the product.

[0009] As a further optimization of the above technical solution: a first cavity is formed on the first fixed mold, a first core is formed on the first moving mold, the first slider is located on the side of the first core, the first core includes a first molding block, two first inclined ejectors and two second molding blocks, the first molding block is integrally formed in the middle of the first core, the two first inclined ejectors are respectively located on both sides of the first molding block, two relatively inclined first guide holes are formed in the first moving mold, the two first guide holes are respectively located on both sides of the first molding block, the rods of the two first inclined ejectors are respectively inserted into the two first guide holes, guide inclined surfaces are formed on both sides of the first molding block, the head of the first inclined ejector is in close contact with the guide inclined surface, a first ejector plate is provided on the first moving mold, two first I-shaped guide blocks with I-shaped grooves are provided on the first ejector plate, the bottom of the two first inclined ejectors is provided with a first I-shaped mating block that slides with the I-shaped groove, the two second molding blocks are respectively located on both sides of the first molding block, the second molding blocks are in close contact with the first inclined ejectors, and the bottom of the second molding blocks is fixed on the first moving mold.

[0010] As a further optimization of the above technical solution: after the mold is opened, the first ejector plate drives the two first inclined ejectors to move upward. The head of the first inclined ejector pushes the product upward so that the product is separated from the first core, the first molding block and the second molding block. At the same time, the two first inclined ejectors move relative to each other along the first guide inclined hole and the guide inclined surface so that the connection between the head of the first inclined ejector and the product is loosened. Finally, the product is taken out so that the product is separated from the first inclined ejector, thus completing the molding and demolding of the product.

[0011] As a further optimization of the above technical solution: two second sliders are also slidably provided on the first moving mold, and two second sliders are provided with second inclined guide pillars. The top of the second inclined guide pillars is connected to the first fixed mold. The first slider is located on the side of the first core. The two second sliders are arranged opposite each other and are located on both sides of the first core. A first forming protrusion and a second forming protrusion are formed on the opposite side of the two second sliders. When the mold is closed, the end faces of the first forming protrusion and the second forming protrusion are in close contact with the side of the first inclined top.

[0012] As a further optimization of the above technical solution: the first fixed mold and the second moving mold open, the second slider moves outward under the guidance of the second inclined guide post to perform core pulling, and the two second sliders move in opposite directions, so that the first forming protrusion and the second forming protrusion on the second slider are separated from the product.

[0013] As a further optimization of the above technical solution: a third forming protrusion is provided on the first fixed mold, and a first forming rod is also provided inside the first fixed mold. When the mold is closed, the end of the first forming rod is inserted into the third forming protrusion with an interference fit.

[0014] As a further optimization of the above technical solution: after the first moving mold and the first fixed mold are closed to injection mold the product, the first molding rod is pulled outward using a tool to detach the first molding rod from the product. Then the first fixed mold and the second moving mold separate, and the first cavity on the first fixed mold and the third molding protrusion detach from the product.

[0015] As a further optimization of the above technical solution: the third fixed mold has two third cavities, the third moving mold has two third cores, the two third cavities and the two third cores constitute two mold cavities, making the third injection mold a one-outlet two-injection mold. The third moving mold is provided with four second inclined ejectors, which are respectively arranged in pairs in the two third cores. The third moving mold is provided with four second guide inclined holes. The two second inclined ejectors located in the same third core are arranged in parallel, and the tails of the two second inclined ejectors located in different third cores are arranged at an angle relative to each other. The third ejector plate is provided with four second I-shaped guide blocks.

[0016] As a further optimization of the above technical solution: the third ejector plate is provided with a plurality of second ejector rods, the top surface of the second ejector rods and the top surface of the second inclined ejector are located inside the third core and are coplanar with the bottom of the groove of the third core; the third ejector plate drives the second ejector rods to move upward, and after the second inclined ejector separates from the product, the second ejector rods completely eject the product, so that the product is separated from the third moving mold, thus completing the molding and demolding of the product.

[0017] Compared with existing technologies, this invention uses a slanted core-pulling mechanism to demold the slanted surface of the product. The first slanted core-pulling mechanism, driven by the first slanted guide post and guided by the slanted I-beam guide groove, pulls the first slider slantedly. The second slanted core-pulling mechanism, driven by the third ejector plate and guided by the second guide slanted hole and the slanted I-beam groove, moves the second slanted ejector downwards to pull the core. This invention provides two slanted core-pulling mechanisms for products with slanted surfaces, ensuring reliable core pulling of the product's slanted surface, improving the product demolding success rate, increasing the product yield and aesthetics, and increasing production output. Furthermore, by designing different driving and core-pulling methods, it meets the structural requirements of different molds and the core-pulling needs of different products. The first injection mold forming solves the forming and demolding problem of the fixing hole on the base fixing part by pre-extracting the first forming rod, preventing damage to the base during mold opening. Through the upward movement and relative movement of the two first slanted ejectors, the connection between the first slanted ejectors and the base is loosened while ejecting the base, preventing the base from sticking to the first slanted ejectors, allowing the base to demold smoothly, improving the base yield and the aesthetics of the finished product. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the first injection mold in this invention.

[0019] Figure 2 This is another cross-sectional structural diagram of the first injection mold in this invention.

[0020] Figure 3 This is a three-dimensional structural schematic diagram of the first injection mold in this invention.

[0021] Figure 4 This is an exploded structural diagram of the second injection mold in this invention.

[0022] Figure 5 This is a schematic cross-sectional view of the third injection mold in this invention.

[0023] Figure 6 This is an exploded structural diagram of the third injection mold in this invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the backrest unlocking handle assembly in this invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. For example... Figure 1-7As shown, the molding process of an automotive plastic part with a sloping surface includes the following steps: ① Injection molding: The injection mold is installed on the injection molding machine, and the barrel temperature of the injection molding machine is controlled in sections to keep the temperature of each section of the barrel within the range of 160℃~270℃. Then, the injection molding machine drives the injection mold to close, and the plastic raw material is added to the hopper of the injection molding machine. The plastic raw material enters the barrel located below the hopper. Through the heating and pressurization of the injection molding machine, the molten plastic raw material in the barrel is injected into the mold cavity of the injection mold; ② Cooling and solidification: After injection molding, the product needs to be cooled to solidify and form; ③ Demolding and removal: After the product has cooled and solidified, the injection molding machine opens the injection mold, and the sloping surface on the product is demolded by the inclined core-pulling mechanism. After the product is ejected, it is removed.

[0026] In the above technical solution: the automotive plastic part with the bevel is specifically the base 3 and the upper cover 7 in the backrest unlock handle assembly. The base 3 includes a beveled groove 31, a protrusion 33, two hinge openings 32, and two snap-fit ​​holes 34, as shown below. Figure 3 , 7 As shown; the upper cover 7 includes a cover body and inclined fixing blocks 71 located on both sides of the cover body, as shown. Figure 6 , 7 As shown.

[0027] In the above technical solution: the injection mold includes a first injection mold 1 for molding the base 3, such as... Figure 1-3 As shown, the first injection mold 1 includes a first fixed mold 11, a first moving mold 12, and a first inclined core-pulling mechanism. The first inclined core-pulling mechanism includes a first slider 15 slidably disposed on the first moving mold 12. A first inclined guide post 151 passes through the first slider 15, and the top of the first inclined guide post 151 is connected to the first fixed mold 11. The first slider 15 is provided with an inclined slider forming part 152 for forming the inclined surface on the product. The slider forming part 152 forms the inclined groove 31 on the base 3. A guide slider 17 is fixed on the first moving mold 12. The guide slider 17 is provided with an inclined I-shaped guide groove 171. The first slider 15 is slidably disposed in the I-shaped guide groove 171. The inclination angle of the I-shaped guide groove 171 is the same as the inclination angle of the slider forming part 152.

[0028] In the above technical solution: a first cavity 13 is formed on the first fixed mold 11, and a first core 14 is formed on the first moving mold 12. A first slider 15 is located on the side of the first core 14. The first core 14 includes a first molding block 113, two first inclined ejectors 18, and two second molding blocks 19. The first molding block 113 is integrally formed in the middle of the first core 14. The two first inclined ejectors 18 are respectively located on both sides of the first molding block 113. Two relatively inclined first guide holes 121 are formed in the first moving mold 12. The two first guide holes 121 are respectively located on both sides of the first molding block 113. The rods of the two first inclined ejectors 18 are respectively inserted into the two first guide holes 121. Guide inclined surfaces 114 are formed on both sides of the first molding block 113, and the heads of the first inclined ejectors 18 are in close contact with the guide inclined surfaces 114. The first moving mold 12 is provided with a first ejector plate 110, and the first ejector plate 110 is provided with two first I-shaped guide blocks 111 having I-shaped grooves. The bottom of each of the two first inclined ejectors 18 is provided with a first I-shaped mating block 112 that slides with the I-shaped groove. Two second molding blocks 19 are respectively located on both sides of the first molding block 113, that is, each side of the first molding block 113 has a second molding block 19 and a first inclined ejector 18, and the second molding block 19 is in close contact with the first inclined ejector 18. The bottom of the second molding block 19 is fixed to the first moving mold 12. The two first inclined ejectors 18, the two second molding blocks 19, and the first molding block 113 cooperate to make the molded base 3 hollow.

[0029] In the above technical solution: two second sliders 16 are slidably provided on the first moving mold 12, and each of the two second sliders 16 is provided with a second inclined guide post 161. The top of the second inclined guide post 161 is connected to the first fixed mold 11. The first slider 15 is located on the side of the first core 14, and the two second sliders 16 are arranged opposite each other and located on both sides of the first core 14. The opposite sides of the two second sliders 16 are provided with a first forming protrusion 162 and a second forming protrusion 163. When the mold is closed, the end faces of the first forming protrusion 162 and the second forming protrusion 163 are in close contact with the side of the first inclined top 18, and the hinge opening 32 and the snap-fit ​​hole 34 are formed respectively.

[0030] In the above technical solution: a third forming protrusion 101 is provided on the first fixed mold 11, and a first forming rod 102 is also provided inside the first fixed mold 11. When the mold is closed, the end of the first forming rod 102 is interference-fitted into the third forming protrusion 101 to prevent the first forming rod 102 from moving due to injection pressure during injection molding. The third forming protrusion 101 forms the protrusion 33, and the first forming rod 102 forms the fixing hole on the protrusion 33. The protrusion 33 is used to fix to the vehicle frame.

[0031] The demolding process of the base 3 is as follows: After the first moving mold 12 and the first fixed mold 11 are closed to injection mold the base 3, the first forming rod 102 is pulled outward using a tool (such as a suction cup tool) so that the first forming rod 102 is disengaged from the fixing hole on the protrusion 33. Then the first fixed mold 11 and the second moving mold 12 are separated, and the first cavity 13 and the third forming protrusion 101 on the first fixed mold 11 are disengaged from the base 3. At the same time as the mold is opened, the first slider 15 and the second slider 16 move outward under the guidance of the first inclined guide post 151 and the second inclined guide post 161 respectively to perform core pulling. The first slider 15 is pulled out obliquely along the inclined I-shaped guide groove 171, so that the slider forming part 152 on the first slider 15 is disengaged from the inclined groove 31 on the base 3. The two second sliders 16 move in opposite directions, so that the first forming protrusion 162 and the second forming protrusion 163 on the second slider 16 are disengaged from the hinge opening 32 and the snap-fit ​​hole 34 on the base 3 respectively, thus completing the core pulling of the first slider 15 and the second slider 16. After the mold is opened, the first ejector plate 110 drives the two first inclined ejectors 18 to move upward. The head of the first inclined ejector 18 pushes the base 3 upward, causing the base 3 to separate from the first core 4, the first molding block 113 and the second molding block 19. At the same time, the two first inclined ejectors 18 move relative to each other along the first guide inclined hole 121 and the guide inclined surface 114, so that the connection between the head of the first inclined ejector 18 and the base 3 is loosened, preventing the base 3 from sticking to the first inclined ejector 18. Finally, the base 3 is taken out, so that the base 3 separates from the first inclined ejector 18, completing the molding and demolding of the base 3. The base 3 is formed by the first injection mold 1. The complex undercut structure on the base 3 is formed by the first slider 15, the second slider 16, the first inclined ejector 18, the first forming rod 102, etc. The first slider 15 conforms to the inclined angle of the inclined groove 31 on the base 3 for oblique core pulling, ensuring stable and smooth core pulling. The first slider 15 and the second slider 16 realize multi-angle and multi-directional core pulling to meet the core pulling requirements of the complex undercut of the base 3. The first forming rod 102, which is pulled out in advance, solves the forming and demolding problem of the fixing hole on the protrusion 33 of the base 3, and prevents the base from being pulled apart when the mold is opened. By moving the two first inclined ejectors 18 upward and moving relative to each other, the connection between the first inclined ejector 18 and the base 3 is loosened while ejecting the base 3, preventing the base 3 from sticking to the first inclined ejector 18, so that the base 3 can be demolded smoothly, improving the yield and appearance of the finished product.

[0032] In the above technical solution: the injection mold also includes a third injection mold 6 for molding the upper cover 7, such as... Figure 5 , 6As shown, the third injection mold 6 includes a third fixed mold 61, a third moving mold 62, and a second inclined core-pulling mechanism. The second inclined core-pulling mechanism includes a plurality of second inclined ejectors 65 located on the third moving mold 62. The sides of the second inclined ejectors 65 are provided with inclined ejector protrusions 66, and the bottom of the inclined ejector protrusions 66 is provided with a forming inclined surface. The forming inclined surface corresponds to the inclined surface on the fixing block 71 in the upper decorative cover 7. The third moving mold 62 is provided with a plurality of second guide inclined holes 621, and the rods of the second inclined ejectors 65 pass through the second guide holes 621. Inside the inclined hole 621, the third moving mold 62 is provided with a third ejector plate 67, and the third ejector plate 67 is provided with a number of second I-beam guide blocks 671. The second I-beam guide blocks 671 are provided with inclined I-beam grooves 672. The inclination angle of the inclined I-beam grooves 672 is the same as the inclination angle of the forming inclined surface. The bottom of the second inclined ejector 65 is provided with a second I-beam mating block 651 that slides with the inclined I-beam grooves 672. When the mold is closed, the second I-beam mating block 651 is located at the high point of the inclined I-beam grooves 672.

[0033] In the above technical solution: the third fixed mold 61 has two third cavities 63, and the third moving mold 62 has two third cores 64. The two third cavities 63 and the two third cores 64 constitute two mold cavities, making the third injection mold 6 a one-outlet two-injection mold, capable of simultaneously molding two upper decorative covers 7. The third moving mold 62 is provided with four second inclined ejectors 65, which are respectively arranged in pairs within the two third cores 64 for molding the fixing blocks 71, with the molding inclined surfaces corresponding to the inclined surfaces on the fixing blocks 71. The third moving mold 62 is provided with four second guide inclined holes 621. Two second inclined ejectors 65 located within the same third core 64 are arranged in parallel, while the tails of two second inclined ejectors 65 located within different third cores 64 are arranged at relative inclinations. The third ejector plate 67 is provided with four second I-beam guide blocks 671. The third ejector plate 67 is provided with several second ejector rods 68. The top surface of the second ejector rods 68 and the top surface of the second inclined ejector rods 65 are located inside the third core 64 and are coplanar with the bottom of the groove of the third core 64.

[0034] The demolding process of the upper cover 7 is as follows: After the third fixed mold 61 and the third moving mold 62 close to injection mold the two upper cover 7, the third fixed mold 61 and the third moving mold 62 separate, the third cavity 63 detaches from the upper cover 7, and then the third ejector plate 67 drives the second I-beam guide block 671, the second inclined ejector 65 and the second ejector rod 68 to move upward. The second inclined ejector 65 moves obliquely upward along the second guide inclined hole 621, and at the same time, the bottom of the second inclined ejector 65 moves downward along the inclined I-beam groove 672, so that the second inclined ejector 65 ejects the upper cover 7. At the same time, the second inclined ejector 65 gradually moves obliquely downward so that the molding inclined surface detaches from the fixing block 71 on the upper cover 7. After the second inclined ejector 65 detaches from the upper cover 7, the second ejector rod 68 completely ejects the upper cover 7, so that the upper cover 7 detaches from the third moving mold 62, completing the molding and demolding of the upper cover 7. The upper cover 7 serves as a dustproof function. The third injection mold 6 can mold two upper covers at the same time, improving molding efficiency. While the second inclined ejector 65 pushes the upper cover 7 out, the second inclined ejector moves diagonally downward along the inclined I-beam groove 672 to disengage from the fixing block 71 on the upper cover 7, ensuring the smooth demolding of the fixing block 71.

[0035] In this invention, a slanted core-pulling mechanism is used to demold the slanted surface of the product. The first slanted core-pulling mechanism, driven by the first slanted guide post 151 and guided by the inclined I-beam guide groove 171, causes the first slider 15 to be pulled obliquely. The second slanted core-pulling mechanism, driven by the third ejector plate 67 and guided by the second guide slanted hole 621 and the inclined I-beam groove 672, causes the second slanted ejector 65 to move obliquely downward to pull the core. This invention provides two slanted core-pulling mechanisms for products with slanted surfaces, ensuring reliable core pulling of the product's slanted surface, improving the product demolding success rate, improving the product yield and aesthetics, increasing production output, and meeting the structural requirements of different molds and the core pulling needs of different products by designing different driving methods and core-pulling methods.

[0036] Additionally, the backrest unlocking handle assembly also includes a handle body 4, which includes a hinge through hole 41, a pull cable hole 42, and a handle groove 43. Figure 4 , 7 As shown. It also includes a second injection mold 2 for molding the handle body 4, such as... Figure 4As shown, the second injection mold 2 includes a second fixed mold 21 and a second moving mold 22. The second fixed mold 21 has two second cavities 23, and the second moving mold 22 has two second cores 24. The second injection mold 2 can simultaneously form two handle bodies 4. A second forming rod 25 is fixed within each of the two second cavities 23. The end of the second forming rod 25 protrudes from the forming surface of the second cavity 23, and when the mold is closed, the end face of the second forming rod 25 is in close contact with the bottom surface of the corresponding second core 24, thus forming the pull wire hole 42. A third forming rod 26 passes through each of the two second cores 24. When the mold is closed, the end face of the third forming rod 26 is in close contact with the bottom surface of the corresponding second cavity 23, thus forming the hinge through hole 41. A third slider 27 slides on the second moving mold 22, and a second inclined guide post 28 passes through the third slider 27. The top of the second inclined guide post 28 is connected to the second fixed mold 21. The third slider 27 has two slider protrusions 211 on its side to form the handle groove 43. The second moving mold 22 also includes a second ejector plate 29 and a plurality of first ejector pins 210 located on the second ejector plate 29. The tail of the third forming rod 26 is integrally formed on the top of the first ejector pins 210.

[0037] The demolding process of the handle body 4 is as follows: After the second fixed mold 21 and the second moving mold 22 are closed to injection mold the two handle bodies 4, the second fixed mold 21 and the second moving mold 22 separate, the second cavity 23 disengages from the handle body 4, the two second forming rods 25 disengage from the pull wire hole 42, and at the same time, the third slider 27 moves backward under the guidance of the second inclined guide post 28 to pull the core, so that the slider protrusion 211 disengages from the handle groove 43 of the handle body 4. Finally, the second ejector plate 29 drives the first ejector rod 210 and the third forming rod 26 to move upward, pushing the handle body 4 out and disengaging it from the second core 24. Finally, the handle body 4 is moved upward and removed to disengage it from the third forming rod 26, completing the molding and demolding of the handle body 4. Step one, preparing the base 3, and step two, preparing the handle body 4, have no sequential order and can be performed simultaneously. The second injection mold 2 simultaneously forms two handle bodies 4, resulting in high forming efficiency and increased production. The second injection mold 2 forms the pull wire hole 42 through the second forming rod 25 on the second fixed mold 21. When the mold is opened, the second forming rod 25 is directly disengaged from the pull wire hole 42. The hinge through hole 41 is formed through the third forming rod 26 on the second moving mold 22. The third forming rod 26 is integrally formed on the first ejector rod 219 to prevent the hinge through hole 41 from directly disengaging from the third forming rod 26 during ejection, which would cause damage to the base 3.

[0038] The assembly process of the backrest unlocking handle assembly is as follows: The handle body 4 is placed inside the base 3. The two ends of the hinge through hole 41 on the handle body 4 are respectively located within two hinge openings 32. The shank of the screw passes through the hinge opening 32 and is fixed within the hinge through hole 41, hinged to the base 3. The protruding edge 44 on the side of the handle groove 43 on the handle body 4 is movably disposed within the oblique groove 31. The pull cable hole 42 is connected to the unlocking component via a pull cable or pull rod. The unlocking component is a conventional technology in this field. The protrusion 33 fixes the base 3 to the vehicle frame. Figure 6 , 7 As shown, the fixing block 71 is inserted into the snap-fit ​​hole 34 on the base 3, so that the upper cover 7 is fixed on the top of the base 3 and located above the handle body 4. The upper cover 7 prevents dust from entering the connection between the base 3 and the frame.

[0039] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of the present invention.

Claims

1. A process for the forming of an automotive plastic part having a bevel, characterized in that Includes the following steps: ① Injection molding: The injection mold is installed on the injection molding machine, and the barrel temperature of the injection molding machine is controlled in sections to keep the temperature of each section of the barrel in the range of 160℃~270℃. Then the injection molding machine drives the injection mold to close, and the plastic raw material is added to the hopper of the injection molding machine. The plastic raw material enters the barrel located below the hopper. Through the heating and pressurization of the injection molding machine, the molten plastic raw material in the barrel is injected into the mold cavity of the injection mold. ② Cooling and solidification: After injection molding, the product needs to be cooled to solidify and take shape; ③ Demolding and removal: After the product has cooled and solidified, the injection molding machine opens the injection mold and uses the inclined core-pulling mechanism to demold the inclined surface on the product. After the product is completely ejected, it is removed.

2. A process for molding an automotive plastic part with bevels as claimed in claim 1, wherein The injection mold includes a first injection mold (1), which includes a first moving mold (12), a first fixed mold (11), and a first inclined core-pulling mechanism. The first inclined core-pulling mechanism includes a first slider (15) slidably disposed on the first moving mold (12). A first inclined guide post (151) is provided on the first slider (15). The top of the first inclined guide post (151) is connected to the first fixed mold (11). The first slider (15) is provided with an inclined slider forming part (152) for forming the inclined surface on the product. A guide slider (17) is fixed on the first moving mold (12). An inclined I-shaped guide groove (171) is formed on the guide slider (17). The first slider (15) is slidably disposed in the I-shaped guide groove (171). The inclination angle of the I-shaped guide groove (171) is the same as the inclination angle of the slider forming part (152). After injection molding is completed, the first fixed mold (11) and the first moving mold (12) are opened. The first slider (15) moves outward under the guidance of the first inclined guide post (151) to perform core pulling. The first slider (15) is pulled obliquely along the inclined I-shaped guide groove (171) so that the slider forming part (152) on the first slider (15) is separated from the product.

3. A process for molding an automotive plastic part with bevels as claimed in claim 1, wherein The injection mold also includes a third injection mold (6), which includes a third fixed mold (61), a third moving mold (62), and a second inclined core-pulling mechanism. The second inclined core-pulling mechanism includes a plurality of second inclined ejectors (65) located on the third moving mold (62). The sides of the second inclined ejectors (65) are provided with inclined ejector protrusions (66). The bottom of the inclined ejector protrusions (66) is provided with a forming inclined surface, which corresponds to the inclined surface on the molded product. The third moving mold (62) is provided with a plurality of second guide inclined holes (621). The rod of the second inclined ejector (65) passes through the second guide holes. Inside the inclined hole (621), the third moving mold (62) is provided with a third ejector plate (67), and the third ejector plate (67) is provided with a plurality of second I-beam guide blocks (671). The second I-beam guide blocks (671) are provided with inclined I-beam grooves (672). The inclination angle of the inclined I-beam grooves (672) is the same as the inclination angle of the forming inclined surface. The bottom of the second inclined top (65) is provided with a second I-beam mating block (651) that slides with the inclined I-beam grooves (672). When the mold is closed, the second I-beam mating block (651) is located at the height of the inclined I-beam grooves (672). After the third fixed mold (61) and the third moving mold (62) are closed to make the product injection molded, the third fixed mold (61) and the third moving mold (62) separate. The third ejector plate (67) drives the second I-shaped guide block (671) and the second inclined ejector (65) to move upward. The second inclined ejector (65) moves obliquely upward along the second guide inclined hole (621). At the same time, the bottom of the second inclined ejector (65) moves downward along the inclined I-shaped groove (672), so that the second inclined ejector (65) ejects the product. The second inclined ejector (65) gradually moves obliquely downward so that the molding inclined surface separates from the product.

4. A process for molding an automotive plastic part with a bevel as claimed in claim 2, wherein The first fixed mold (11) has a first cavity (13), and the first moving mold (12) has a first core (14). The first slider (15) is located on the side of the first core (14). The first core (14) includes a first molding block (113), two first inclined ejectors (18), and two second molding blocks (19). The first molding block (113) is integrally formed in the middle of the first core (14). The two first inclined ejectors (18) are located on both sides of the first molding block (113). The first moving mold (12) has two relatively inclined first guide holes (121). The two first guide holes (121) are located on both sides of the first molding block (113). The rod portion of the two first inclined ejectors (18) The first molding block (113) is not inserted into the two first guide inclined holes (121). Both sides of the first molding block (113) are provided with guide inclined surfaces (114). The head of the first inclined top (18) is in close contact with the guide inclined surface (114). The first moving mold (12) is provided with a first ejector plate (110). The first ejector plate (110) is provided with two first I-shaped guide blocks (111) with I-shaped grooves. The bottom of the two first inclined tops (18) is provided with a first I-shaped mating block (112) that slides with the I-shaped groove. The two second molding blocks (19) are located on both sides of the first molding block (113). The second molding blocks (19) are in close contact with the first inclined tops (18). The bottom of the second molding blocks (19) is fixed on the first moving mold (12). After the mold is opened, the first ejector plate (110) drives the two first inclined ejectors (18) to move upward. The head of the first inclined ejector (18) pushes the product upward so that the product is separated from the first core (14), the first molding block (113) and the second molding block (19). At the same time, the two first inclined ejectors (18) move relative to each other along the first guide inclined hole (121) and the guide inclined surface (114) so ​​that the connection between the head of the first inclined ejector (18) and the product is loosened. Finally, the product is taken out so that the product is separated from the first inclined ejector (18), thus completing the molding and demolding of the product.

5. A process for molding an automotive plastic part having a bevel as in claim 4, wherein Two second sliders (16) are slidably provided on the first moving mold (12). Two second sliders (16) are provided with second inclined guide pillars (161). The top of the second inclined guide pillars (161) is connected to the first fixed mold (11). The first slider (15) is located on the side of the first core (14). The two second sliders (16) are arranged opposite each other and are located on both sides of the first core (14). A first forming protrusion (162) and a second forming protrusion (163) are provided on the opposite side of the two second sliders (16). When the mold is closed, the end faces of the first forming protrusion (162) and the second forming protrusion (163) are in close contact with the side of the first inclined top (18). The first fixed mold (11) and the second moving mold (12) open, and the second slider (16) moves outward under the guidance of the second inclined guide post (161) to perform core pulling. The two second sliders (16) move in opposite directions, so that the first forming protrusion (162) and the second forming protrusion (163) on the second slider (16) are separated from the product.

6. The molding process for an automotive plastic part with an inclined surface according to claim 4, characterized in that... The first fixed mold (11) is provided with a third forming protrusion (101), and a first forming rod (102) is also provided inside the first fixed mold (11). When the mold is closed, the end of the first forming rod (102) is inserted into the third forming protrusion (101) with an interference fit. After the first moving mold (12) and the first fixed mold (11) are closed to make the product injection molded, the first molding rod (102) is pulled outward using a tool, so that the first molding rod (102) is separated from the product. Then the first fixed mold (11) and the second moving mold (12) are separated, and the first cavity (13) on the first fixed mold (11) and the third molding protrusion (101) are separated from the product.

7. The molding process for an automotive plastic part with an inclined surface according to claim 3, characterized in that... The third fixed mold (61) has two third cavities (63), and the third moving mold (62) has two third cores (64). The two third cavities (63) and the two third cores (64) constitute two mold cavities, making the third injection mold (6) a two-injection mold. The third moving mold (62) is provided with four second inclined ejectors (65). The four second inclined ejectors (65) are respectively arranged in pairs in the two third cores (64). The third moving mold (62) is provided with four second guide inclined holes (621). The two second inclined ejectors (65) located in the same third core (64) are arranged in parallel. The tails of the two second inclined ejectors (65) located in different third cores (64) are arranged at an angle. The third ejector plate (67) is provided with four second I-shaped guide blocks (671).

8. The molding process for an automotive plastic part with a beveled surface according to claim 7, characterized in that... The third ejector plate (67) is provided with a plurality of second ejector rods (68). The top surface of the second ejector rod (68) and the top surface of the second inclined ejector (65) are located inside the third core (64) and are coplanar with the bottom of the groove of the third core (64). The third ejector plate (67) drives the second ejector rod (68) to move upward. After the second inclined ejector (65) separates from the product, the second ejector rod (68) completely ejects the product, so that the product is separated from the third moving mold (62), thus completing the molding and demolding of the product.

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