Injection molding machine for automobile decorating part

Abstract

The invention relates to the technical field of injection molding, in particular to an injection molding machine for automobile decorating parts, which comprises a charging barrel, an injection machine, a mold and a base, the injection machine is mounted on the upper end face of the base, the charging barrel is connected with the tail of the injection machine, and the mold is further mounted on the base. When the decorative part is subjected to injection molding, the multiple adjusting ejector pins on the demolding mechanism abut against the ribs and the inclined ejector plates correspondingly, the ejection force borne by the decorative part when the decorative part is separated from the mold is moderate by adjusting the pre-tightening force, residues of injection molding materials on the outer surface of the decorative part are reduced through the arrangement of the auxiliary pouring gate, and meanwhile the injection molding efficiency is improved. And the ejection needle on the ejection mechanism separates the residual injection molding material from the decorating part main body, so that the possible regional deformation of the decorating part in the demolding process is avoided, the smoothness of the outer surface of the decorating part can be improved, and the yield of finished decorating parts is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to an injection molding machine for automobile decorative parts. Background Art

[0002] The injection molding machine is an important equipment for manufacturing plastic products. It injects molten plastic into the mold through high pressure, and then obtains the finished product after cooling and solidification. This manufacturing process is widely used in industrial production because it can efficiently produce large quantities of automotive decorative parts with complex shapes. However, because the thickness of automotive decorative parts is relatively thin, and the back also includes fasteners and ribs for connecting with other parts, it is easy to cause local warping and deformation quality defects during the ejection and demolding process due to the uneven ejection force of the ejector pin. The injection plastic residue on the surface is not easy to separate, resulting in local deformation of the connection of the injection plastic residue after separation. The above problems occur during the demolding process, which is easy to reduce the quality of the products produced by the injection molding machine, thereby affecting production efficiency.

[0003] In view of the above problems, the prior art provides some solutions, for example, in the process of demoulding the mold, a cylinder is used to control the ejection speed and ejection force. Since the injection molding machine is generally used for mass production of products, the cylinder needs to be frequently extended and ejected. After long-term use, its airtightness will decrease, and frequent maintenance is required. For example, the invention patent with patent application number CN201410842765.X provides an easy-to-demold injection mold. By changing the inner surface structure of the first top plate, the second top plate and the third top plate, the processing of various injection molds can be completed. It is not limited to a fixed mold style, which improves the performance of use. At the same time, if the mold is worn out after a long period of use, , the mold can continue to be used by replacing the corresponding ejector plate without replacing the entire lower mold, which reduces the cost of use; the design of the third ejector and the fourth ejector allows the operator to adjust the mold from the left and right sides according to actual conditions, avoiding the situation where the injection molded parts cannot be smoothly demolded due to the uneven pressure on both sides of the mold, further improving the performance and making demolding more secure. However, the ejector spring in this solution cannot control the ejection force, and the ejector plate cannot separately adjust the ejection force on different areas of the decorative part during demolding, which causes an imbalance in the ejection force. When the decorative part is provided with special shapes such as ribs or fasteners, this area is easily subject to the uneven ejection force, which causes the decorative part to deform during demolding. Summary of the invention

[0004] The object of the present invention is to provide an injection molding machine for automobile decorative parts, so as to solve the problem that automobile decorative parts are thin in thickness and have complex structures thereon, such as fasteners, reinforcing ribs, etc., which are prone to uneven force during demolding and ejection, causing the automobile decorative parts to deform, and the injection plastic residue on the surface is not easy to separate, thereby causing defects in the produced automobile decorative parts. The above-mentioned problems occurring during the demolding process are likely to reduce the quality of the products produced by the injection molding machine, thereby affecting the production efficiency, while solving the deficiencies of the existing technical solutions.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An injection molding machine for automobile decorative parts, comprising a base, a barrel, an injection molding gun and a mold, wherein the injection molding gun is mounted on the upper end surface of the base, the barrel is connected to the tail of the injection molding gun, a mold is also mounted on the base, the front and rear ends of the mold are covered with sealing plates, the mold comprises a male mold and a female mold, the sealing plate connects the injection molding gun to the female mold through an injection hole, a female mold core is mounted in the female mold, a male mold core is mounted in the male mold, the female mold core and the male mold core are nested with each other, a molding cavity is arranged in the gap between them, and the molding cavity is used to mold decorative parts A main body and a fastener for molding one side of the decorative part, an ejection mechanism is provided between the male mold and the sealing plate, the ejection mechanism adjusts the preload force to stabilize the force on the decorative part during demoulding, the ejection mechanism includes an adjusting ejector pin and an ejector pin, the male mold core is provided with a rib groove for molding the ribs on the back side of the decorative part main body, an inclined ejector plate for molding and separating the decorative part fasteners, and an auxiliary runner for promoting injection molding efficiency, the adjusting ejector pin extends into the rib groove and abuts against the rib, and is connected to the inclined ejector plate, and the ejector pin passes through the auxiliary runner.

[0007] It is easy to understand that by manually adjusting the preload of the adjusting ejector pin on the ejection mechanism, the ejection force on the decorative part is minimized at the beginning. As the male mold moves to the left side of the base, the adjusting ejector pin is ejected from the rib groove. During this process, the adjusting ejector pin begins to compress due to the weight of the decorative part. As the compression amount increases, the ejection force becomes greater, and the rib is separated from the rib groove. At the same time, the inclined ejector plate is separated from the fastener during the ejection of the adjusting ejector pin. As the ejection force increases, the decorative part is ejected from the male mold core, which avoids the decorative part being subjected to unbalanced ejection force at the beginning, causing deformation of the automotive decorative part. While demolding, the ejector pin ejects the auxiliary runner. After the injection plastic in the auxiliary runner is cut off from the decorative part, it is convenient for the decorative part to be ejected from the male mold core, thereby avoiding the injection plastic residue on the surface of the decorative part that is difficult to separate, which leads to defects in the produced automotive decorative parts, thereby ensuring the integrity of the overall appearance of the decorative parts, and further ensuring the yield rate of the decorative parts generated by the injection molding machine of the automotive decorative parts.

[0008] Preferably, the ejection mechanism also includes a ejection plate, a top cavity is provided between the male mold and the sealing plate, the ejection plate is slidably installed in the top cavity, a plurality of adjusting ejector pins are hinged on the ejection plate, and correspond one to one with the positions of the rib grooves, the adjusting ejector pins include tube one, tube two, tube three and an adjusting spring, the upper and lower ends of tube two are rotatably connected to tube one and tube three respectively, the tube three is hinged to the ejection plate, the inner threads of tube one and tube two are connected with an adjusting rod, the upper and lower ends of the adjusting spring are connected to the ejector rod and the adjusting rod respectively, the tube one is also provided with a rotating shaft, a sliding groove slidably connected to the outer surface of the rotating shaft is provided in the inclined ejection plate, a slideway with a trapezoidal inclined surface is provided on the inner wall of the male mold core, the tail of the inclined ejection plate abuts against the slideway, a plurality of ejection springs are arranged in a rectangular shape, and the two ends are respectively connected to the male mold and the sealing plate.

[0009] It is easy to understand that by hingedly connecting the adjusting ejector pin to the ejector plate, the adjusting ejector pin can be rotated 180 degrees to realize multiple ejection directions, and by slidingly connecting the outer surface of the ejector rod and the inner surface of the cylinder one and rotating the cylinder two, the threaded adjusting rod can move upward, thereby controlling the compression amount of the adjusting spring, so that in the process of adjusting the ejector pin to eject the decorative part, the ejection force exerted on the decorative part is from small to large. At the same time, in the process of ejection of the adjusting ejector pin, the rotating shaft on the cylinder one is arranged in an inclined manner due to the inclined groove, so that the adjusting ejector pin can drive the inclined ejector plate to move vertically upward in the process of ejection from the upper oblique side, so that the fastener is freed from the restriction of the inclined ejector plate. With further ejection, the rotating shaft slides from the rightmost end of the groove to the leftmost end, and its inclined ejector The tail of the plate moves along the trapezoidal inclined surface on the slideway, so that the inclined ejector plate is completely separated from the fastener, and because of the separation of the inclined ejector plate, the decorative part can be separated from the male mold core without being subjected to the ejection force, thereby avoiding the problem that the decorative part is difficult to demold due to the shape of the fastener, thereby ensuring the yield rate of the decorative part when demolding. When demolding the automobile decorative part, the adjusting ejector pin of the ejection mechanism is inclined to abut against the rib, and the rib is ejected in the ejection direction, so that the automobile decorative part is separated from the male mold core. Since the adjusting ejector pin is directly abutted against the rib, the adjusting ejector pin will not damage the annular body and the decorative strip due to direct abutment against the decorative part body, thereby reducing the damage of the ejector pin to the automobile interior decoration during the demolding process of the automobile decorative part.

[0010] Preferably, a mounting groove is further provided at the upper end of the ejector rod, and ejection silicone is fixedly connected to the mounting groove. The ejection silicone abuts against the rib and the abutment surface is parallel to the inclined surface of the rib groove.

[0011] It is easy to understand that by fixing the ejection silicone in the groove to ensure that it will not fall off or move during use, silicone has good flexibility and high temperature resistance, and is suitable for ejection applications in high-temperature injection molding environments. During the ejection process, the impact of the adjusting ejector pin on the decorative part is further alleviated, and the friction of the adjusting ejector pin in the rib groove is reduced, thereby extending the service life of the mold. The abutment surface is parallel to the inclined surface of the rib groove, which ensures the integrity of the rib molding and thus ensures the smoothness of the decorative part when demolded.

[0012] Preferably, the inclined top plate is also provided with a groove at the molding fastener, a molding plate is connected to the groove through a molding spring, the outer edge surface of the molding plate is slidably connected to the inner edge surface of the groove, the left side of the molding plate abuts the fastener, and a transition step is provided on the male mold core to cooperate with the abutment of the molding plate and the fastener, and a guide surface is also provided on the step change section of the transition step, and the guide surface is parallel to the contact surface of the molding plate.

[0013] It is easy to understand that in order to prevent the inclined top plate from being worn due to friction with the inner wall of the male mold core after long-term use, causing the injection plastic to leak from the worn gap and causing defects on the surface of the decorative part after cooling and molding, a groove is opened in the inclined top plate, and the molding spring cooperates with the groove so that the molding plate is confined in the groove while the molding spring provides a buffer, so that when the inclined top plate is restored to abut against the decorative part, the molding plate can be retracted into the groove due to the elastic force, thereby avoiding hard contact between the inclined top plate and the male mold core, thereby reducing the wear of the inclined top plate after long-term use. Furthermore, by providing a transition step, the molding plate is buffered in the process of fully extending from the groove, and the guide surface on the step change section can guide the molding plate to the next step until it returns to the initial position, thereby avoiding the wear of the molding plate by the right angle on the transition step.

[0014] Preferably, a compensating grinding plate is provided between the inclined top plate and the abutment portion of the slideway, the compensating grinding plate is connected to the inclined top plate via a compensating spring, and a guiding surface parallel to the trapezoidal inclined surface of the slideway is provided on the lower side of the compensating grinding plate.

[0015] It is easy to understand that, because the tail of the inclined top plate is tightly in contact with the slide, the shape stability of the fastener after molding can be guaranteed. In order to avoid wear at the contact point between the inclined top plate and the slide after multiple demoldings, which makes it impossible for the inclined top plate to stably mold the fastener, a compensating spring is used to connect a compensating grinding template at the tail of the inclined top plate. When wear occurs at the contact point between the compensating grinding template and the slide, the compensating spring pushes the compensating grinding plate toward the slide through elastic force, thereby ensuring that the compensating grinding plate can still be tightly in contact with the slide after the thickness is reduced due to wear, thereby ensuring the service life of the inclined top plate and further ensuring the accuracy of the fastener after molding. At the same time, a guide surface parallel to the trapezoidal inclined surface of the slide is provided on the lower side of the compensating grinding plate, and the deflection force of the compensation spring when the compensation spring returns to the state of abutting against the decorative component is reduced through the transition of the guide surface, thereby ensuring the stability of the compensation spring after long-term use and further ensuring the accuracy of the fastener after molding.

[0016] Preferably, the auxiliary runner is in a "cross shape" and is opened in the middle of the male mold core and is connected to the molded decorative part body on all sides. A discharge end is provided at the connection point, and a gate connected to the injection hole is provided on the female mold core. The center of the auxiliary runner is located within the vertical projection plane of the gate.

[0017] It is easy to understand that because common automobile decorative parts are thin and long, a "cross" shaped auxiliary runner is opened in the center of the male mold core, and the molten plastic in the injection gun is filled with the molding cavity along the four directions of the auxiliary runner, thereby avoiding the injection plastic from flowing from the gate into the molding cavity. The rib grooves in the molding cavity and the bends at the molding fasteners are prone to accumulation of injection plastic, causing the pouring time at these places to be too long, thereby reducing the pouring time for the molten injection plastic to fill the molding cavity of the automobile decorative parts, weakening the impact of the long pouring time on the surface quality of the injection molded parts, and thus improving the surface quality of the automobile decorative parts.

[0018] Preferably, the male mold core is further provided with an ejection hole on the bottom surface of the auxiliary runner, and the ejection hole is separated by the ejection pin.

[0019] It is easy to understand that the ejector mechanism can eject the injection plastic from the auxiliary runner through the ejector pin at the same time as the decorative part is detached from the male mold core. After one injection molding is completed, the operator does not need to clean the remaining injection plastic from the male mold core, thereby facilitating the operator to clean the remaining injection plastic, thereby avoiding the influence of the remaining injection plastic on the next injection molding, thereby ensuring the integrity of the decorative part.

[0020] Preferably, the male mold core is provided with a stopper at the discharge end of the auxiliary runner, and four discharge holes connecting the auxiliary runner and the molding cavity are respectively opened in the stopper, and the discharge holes are arranged obliquely from the direction close to the molding cavity to the direction away from the female mold.

[0021] Preferably, the diameter of the discharge hole gradually decreases in the direction approaching the forming cavity.

[0022] Preferably, the auxiliary runner is provided with a stepped boss near the stopper, and the discharge hole and the ejection hole are located on the left and right sides of the stepped boss.

[0023] It is easy to understand that by setting a stopper at the discharge end of the auxiliary runner and opening a discharge hole in the stopper, during the demolding process, the main body of the decorative part outside the hole is ejected obliquely upward by the ejection mechanism, while the injection plastic in the hole cannot follow the movement of the main body of the decorative part due to the obstruction of the stopper, thereby achieving the separation of the cooled injection plastic and the decorative part, thereby avoiding the subsequent separation of the injection plastic and the decorative part separately, and further ensuring the production efficiency of the injection molding machine.

[0024] Furthermore, the shape of the injection plastic in the discharge hole is determined by the discharge hole. By controlling the outer diameter of the injection plastic discharged into the molding cavity through the discharge hole, the outer diameter is gradually reduced in the direction close to the molding cavity, so that the thickness of this part of the injection plastic is smaller after cooling, so that it can be easily separated from the automotive decorative parts in the molding cavity, thereby avoiding the problem of deformation of the decorative parts in the area near the connection with the injection plastic during demolding, and further ensuring the integrity of the surface of the decorative parts.

[0025] Furthermore, by adding an upwardly protruding stepped boss between the discharge hole and the ejection hole, the thickness of the injection plastic at the stepped boss is made smaller than the injection plastic in the auxiliary runner. When the injection plastic is cooled, the ejector pin is ejected from the discharge hole, and the injection plastic here can be easily deformed and detached, thereby clearing the injection plastic in the discharge hole. This avoids deformation of the area near the connection when the decorative part is separated from the injection plastic, further ensuring the integrity of the surface of the decorative part.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides an ejection mechanism. Before demoulding, the ejection mechanism adjusts the elastic force of the spring on the ejector rod through the second cylinder. The decorative part is subjected to the ejection force of multiple adjustable ejector pins, and the ejection force increases from small to large until the rib is ejected from the rib groove. The inclined ejector plate cooperates with the movement of the first cylinder to enable the fastener to be separated from the male mold core without damage, so that the adjustable ejector pin can complete the demoulding without contacting the main body of the decorative part, thereby avoiding the uneven ejection force on the decorative part during the demoulding process, thereby causing the decorative part to be deformed, thereby ensuring the yield rate of the decorative part during demoulding.

[0028] 2. The present invention provides an auxiliary runner with a corresponding gate on the male mold core, and the injection plastic flowing out of the gate is filled into the molding cavity in the corresponding direction through the auxiliary runner, thereby reducing the pouring time of the molten injection plastic to fill the cavity, weakening the influence of the long pouring time on the surface quality of the injection molded part, and further avoiding the accumulation of the injection plastic and the reduction of the injection molding pressure at multiple bends in the cavity when the injection plastic continuously fills the cavity with complex bends, thereby improving the surface quality of the decorative part.

[0029] 3. The present invention provides ejection silicone, and the abutting surface of the ejection silicone is parallel to the inclined surface of the rib, so that the rib can be ejected upward from the rib groove. The ejection silicone can provide a certain buffer during the ejection process to avoid direct contact between the ejector rod and the decorative part, and can evenly distribute the ejection force to avoid local stress concentration, thereby reducing the deformation of the decorative part, thereby reducing the pressure and damage on the product surface, and further ensuring the yield rate of the decorative part during demolding.

[0030] 4. The present invention arranges a stepped boss in the auxiliary runner so that the injection plastic on the transition step is thinner than that in the auxiliary runner and the material hole, so that when the ejector pin ejects the waste material, this part of the waste material can be deformed more easily, thereby bringing out the waste material in the material hole, and the ejector pin on the ejector mechanism is inserted into the ejector hole to separate the waste material in the auxiliary runner from the decorative part, and the waste material can also be separated from the male mold core after being ejected by the ejector pin, thereby avoiding the accumulation of waste material and affecting the injection molding of the decorative part next time, thereby improving the production efficiency of the decorative part. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the injection molding machine of the automobile decorative part of the present invention;

[0032] Figure 2 It is a structural schematic diagram of automobile decorative parts;

[0033] Figure 3 It is a structural schematic diagram of the back of the automobile decorative part;

[0034] Figure 4 Schematic diagram of the overall structure of the mold;

[0035] Figure 5 for Figure 4 Full cross-section at the middle AA;

[0036] Figure 6 It is a structural schematic diagram of the public mold;

[0037] Figure 7 Schematic diagram of the structure of the master mold;

[0038] Figure 8 It is a structural schematic diagram of the ejection mechanism;

[0039] Fig. 9 A full cross-sectional view of the adjustment ejector pin;

[0040] Fig.10 for Figure 5 A partial enlarged view of point B in the middle;

[0041] Fig.11 for Figure 5 A partial enlarged view of point C in the middle;

[0042] Fig.12 A schematic diagram showing a state in which the inclined top plate is separated from the decorative component;

[0043] Fig.13 for Figure 6 A partial enlarged view of point D in the middle.

[0044] In the figure: 1, base; 102, barrel; 103, injection gun; 2, mold; 201, closing plate; 2012, injection hole; 202, mother mold; 2021, mother mold core; 203, male mold; 2031, male mold core; 2032, rib groove; 2033, inclined top plate; 2035, rotating shaft; 2036, slide groove; 2037, slideway; 204, groove; 2041, forming spring; 205, forming plate; 206, transition step; 2061, guide surface; 207, compensation grinding plate; 2071, compensation spring; 2072, guide surface; 3, mold cavity ;301, gate;4, auxiliary runner;401, discharge end;402, stopper;4021, discharge hole;4022, stepped boss;4023, ejector hole;5, ejector mechanism;501, ejector plate;5011, ejector cavity;502, adjusting ejector pin;503, ejector rod;504, ejector silicone;505, mounting groove;5061, cylinder one;5062, cylinder two;5063, cylinder three;5064, adjusting spring;5065, adjusting rod;507, ejector pin;508, ejector spring;6, decorative parts;601, ribs;602, fasteners. DETAILED DESCRIPTION

[0045] The present invention provides an injection molding machine for automobile decorative parts, and the technical solution is as follows:

[0046] See also Figures 1 to 7An injection molding machine for automobile decorative parts includes a base 1, a barrel 102, an injection molding gun 103 and a mold 2. The upper end surface of the base 1 is equipped with the injection molding gun 103 and the barrel 102. The tail of the barrel 102 and the injection molding gun 103 are connected to the barrel 102. The mold 2 is installed on the base 1. The sealing plate 201 covers the front and rear ends of the mold 2 and is connected to the base 1. The mold 2 is divided into a male mold 203 and a female mold 202. The injection molding gun 103 is connected to the female mold 202 through an injection molding hole 2012 on the sealing plate 201. A female mold core 2021 for forming a decorative part 6 is installed in the female mold 202. A male mold core 2031 for forming a decorative part 6 is installed in the male mold 203. A forming cavity is provided at the gap where the female mold core 2021 and the male mold core 2031 are nested with each other. 3. The molding cavity 3 includes a main body for molding the decorative part 6 and a fastener 602 for molding one side of the decorative part 6. The ejection mechanism 5 is arranged between the male mold 203 and the sealing plate 201. When demolding, the ejection mechanism 5 adjusts the preload force to stabilize the force on the decorative part 6. The ejection mechanism 5 includes an adjusting ejector pin 502 and an ejector pin 507. The male mold core 2031 is provided with a rib groove 2032 for molding the rib 601 on the back of the main body of the decorative part 6, an inclined ejector plate 2033 for molding and separating the fastener 602 of the decorative part 6, and an auxiliary runner 4 for promoting injection molding efficiency. The adjusting ejector pin 502 extends into the rib groove 2032 and abuts against the rib 601, and is connected to the inclined ejector plate 2033. The ejector pin 507 passes through the auxiliary runner 4.

[0047] See also Figure 5 , Figure 8 , Fig. 9 , Fig.11 and Fig.12The ejection mechanism 5 also includes an ejector plate 501. An ejector cavity 5011 is provided between the male mold 203 and the sealing plate 201. The ejector plate 501 is slidably installed in the ejector cavity 5011. A plurality of adjusting ejector pins 502 correspond to the positions of the rib grooves 2032 one by one and are hinged on the ejector plate 501. The adjusting ejector pins 502 include a cylinder 1 5061, a cylinder 2 5062, a cylinder 3 5063 and an adjusting spring 5064. The ejector rod 503 is slidably connected to the cylinder 1 5061. The cylinder 1 5061 and the cylinder 3 5063 are respectively rotated with the upper and lower ends of the cylinder 2 5062. The lower side of the cylinder 3 5063 is hinged with the top plate 501, the cylinder 1 5061 and the cylinder 2 5062 are internally threadedly connected with an adjusting rod 5065, the top rod 503 and the adjusting rod 5065 are connected by an adjusting spring 5064, the rotating shaft 2035 is arranged on the cylinder 1 5061, the inclined top plate 2033 is provided with a slide groove 2036 which is slidably connected with the outer surface of the rotating shaft 2035, the inner wall of the male mold core 2031 is provided with a slideway 2037 with a trapezoidal inclined surface, the slideway 2037 is in contact with the tail of the inclined top plate 2033, and the inclined top plate 203 A groove 204 is also provided at the molding fastener 602, and a molding plate 205 is connected to the groove 204 through a molding spring 2041. The outer edge surface of the molding plate 205 is slidably connected to the inner edge surface of the groove 204, and the left side of the molding plate 205 abuts against the fastener 602. A transition step 206 is provided on the male mold core 2031 to match the abutment of the molding plate 205 and the fastener 602. A guide surface 2061 is also provided on the step change section of the transition step 206. A compensation surface is also provided between the abutment of the inclined top plate 2033 and the slideway 2037. The compensation wear plate 207 is connected to the inclined ejector plate 2033 through a compensation spring 2071. The lower side of the compensation wear plate 207 is also provided with a guide surface 2072 parallel to the trapezoidal inclined surface of the slideway 2037. A plurality of ejector springs 508 are arranged in a rectangular shape, and the two ends are respectively connected to the male mold 203 and the sealing plate 201. The mounting groove 505 is provided in the upper end surface of the ejector rod 503. The mounting groove 505 is fixed with an ejector silicone 504. The ejector silicone 504 abuts against the rib 601 and the abutting surface is parallel to the inclined surface of the rib groove 2032.

[0048] See also Figure 6 , Figure 7 , Fig.10 and Fig.13The auxiliary runner 4 in a "cross shape" is opened in the middle of the male mold core 2031 and is connected to the main body of the molded decorative part 6 on all sides. The connection point is provided with a discharge end 401. The female mold core 2021 is provided with a gate 301 connected to the injection hole 2012. The center of the auxiliary runner 4 is located in the vertical projection plane of the gate 301. The ejection hole 4023 is opened on the bottom surface of the auxiliary runner 4. The ejection needle 507 blocks the ejection hole 4023. The stopper 402 is provided at the male mold core 2031 at the auxiliary runner. At the discharge end 401 of the runner 4, four blocks 402 are respectively provided with discharge holes 4021 connecting the auxiliary runner 4 and the molding cavity 3. The discharge holes 4021 are arranged obliquely along the direction close to the molding cavity 3 toward the direction away from the mother mold 202. The aperture of the discharge hole 4021 gradually decreases along the direction close to the molding cavity 3. The auxiliary runner 4 is provided with a stepped boss 4022 near the block 402, and the discharge hole 4021 and the ejection hole 4023 are located on the left and right sides of the stepped boss 4022.

[0049] Reference Figures 1 to 13 , the injection plastic is put into the barrel 102 and filled with the injection gun 103. The injection plastic melted by the injection gun 103 after heating is injected into the mother mold core 2021 through the injection hole 2012 opened on the sealing plate 201, and then filled with the molding cavity 3 through the gate 301. The water cooling system (not shown) in the mold 2 cools the molten injection plastic, thereby completing the injection molding of the automobile decorative part 6. Figure 1As shown, the male mold 203 moves to the left, and the female mold 202 and the injection gun 103 are fixed on the base 1 due to the connection. At this time, the top plate 501 is stationary relative to the male mold 203. As the male mold 203 continues to move, the space of the top cavity 5011 is reduced, and the ejection spring 508 is compressed. The ejection mechanism 5 is ejected from the male mold core 2031, and the decorative part 6 is separated from the male mold core 2031. By manually adjusting the pre-tightening force of the adjusting ejector pin 502 on the ejection mechanism 5, the ejection force on the decorative part 6 is initially the smallest. As the male mold 203 moves to the left side of the base 1, the adjusting ejector pin 502 is ejected from the rib groove 2032. In this process, the adjusting ejector pin 502 begins to be compressed due to the weight of the decorative part 6. As the compression amount increases, the greater the ejection force , the rib 601 is separated from the rib groove 2032. At the same time, the inclined ejector plate 2033 is separated from the fastener 602 during the ejection process of the adjusting ejector pin 502. As the ejection force increases, the decorative part 6 is ejected from the male mold core 2031, which avoids the decorative part 6 from being subjected to an unbalanced ejection force at the beginning, causing the automobile decorative part 6 to be deformed. During demoulding, the ejector pin 507 ejects the auxiliary runner 4, and the injection plastic therein is cut off from the decorative part 6, which facilitates the ejection of the decorative part 6 from the male mold core 2031. By hingedly connecting the adjusting ejector pin 502 to the ejector plate 501, the adjusting ejector pin 502 can be rotated 180° to achieve multiple ejection directions. By slidingly connecting the outer surface of the ejector rod 503 and the inner surface of the cylinder 1 5061 and rotating the cylinder 2 5062, the screw The adjusting rod 5065 connected with the groove can move upward, so as to control the compression amount of the adjusting spring 5064, so as to realize that in the process of adjusting the ejector pin 502 to eject the decorative part 6, the ejection force exerted on the decorative part 6 increases from small to large. At the same time, in the process of adjusting the ejector pin 503 to eject, the rotating shaft 2035 on the cylinder 5061 is arranged with the inclined groove 2036, so that the adjusting ejector pin 502 can cooperate with the slideway 2037 to drive the inclined ejector plate 2033 to move vertically upward by an end distance in the process of ejection from the upper oblique side, so that the fastener 602 is free from the restriction of the inclined ejector plate 2033. With further ejection, the rotating shaft 2035 slides from the rightmost end of the slideway 2036 to the leftmost end, and the tail of the inclined ejector plate 2033 moves along the trapezoidal inclined surface on the slideway 2037. The decorative part 6 can be separated from the male mold core 2031 by the separation of the inclined top plate 2033 and the fastener 602 without being subjected to the ejection force, thereby avoiding the problem that the decorative part 6 is difficult to demould due to the shape of the fastener 602, thereby ensuring the yield rate of the decorative part 6 when demoulding. In order to avoid the wear of the inclined top plate 2033 due to friction with the inner wall of the male mold core 2031 after long-term use, resulting in leakage of the injection plastic from the worn gap and causing defects on the surface of the decorative part 6 after cooling and molding, a groove 204 is provided in the inclined top plate 2033, and the molding spring 2041 cooperates with the groove 204, so that the molding plate 205 is confined in the groove 204.The molding spring 2041 provides a buffer, so that when the inclined top plate 2033 is restored to abut against the decorative part 6, the molding plate 205 can be retracted into the groove 204 due to the elastic force, avoiding the hard contact between the inclined top plate 2033 and the male mold core 2031, thereby reducing the wear of the inclined top plate 2033 after long-term use. Furthermore, by setting the transition step 206, the molding plate 205 is buffered in the process of completely extending from the groove 204, and the guide surface 2061 on the step change section can guide the molding plate 205 to the next step until it returns to the initial position, avoiding the wear of the molding plate 205 by the right angle on the transition step 206.

[0050] Because the tail of the inclined top plate 2033 is tightly in contact with the slideway 2037, the shape of the fastener 602 after molding can be guaranteed to be stable. In order to avoid wear at the contact between the inclined top plate 2033 and the slideway 2037 after multiple demolding, which makes it impossible for the inclined top plate 2033 to stably mold the fastener 602, a compensating grinding plate is connected to the tail of the inclined top plate 2033 by using a compensating spring 2071. When wear occurs at the contact between the compensating grinding plate and the slideway 2037, the compensating spring 2071 of the plate 207 pushes the compensating grinding plate 207 toward the slideway 2037 through the elastic force to ensure that the compensating grinding plate 207 is not worn. As a result, after the thickness is reduced, it can still be tightly abutted with the slide 2037, thereby ensuring the service life of the inclined top plate 2033 and further ensuring the accuracy of the fastener 602 after molding. At the same time, by setting a guide surface 2072 parallel to the trapezoidal inclined surface of the slide 2037 on the lower side of the compensation grinding plate 207, the transition of the guide surface 2072 reduces the deflection force on the compensation spring 2071 when the compensation spring 2071 returns to the state of abutting with the decorative part 6, thereby ensuring the stability of the compensation spring 2071 after long-term use and further ensuring the accuracy of the fastener 602 after molding. When the automobile decorative part 6 is demoulded, the adjusting ejector pin 502 of the ejection mechanism 5 is tilted against the rib 601, and the rib 601 is ejected in the ejection direction, so that the automobile decorative part 6 is separated from the male mold core 2031. Since the adjusting ejector pin 502 is directly abutted against the rib 601, the adjusting ejector pin 502 will not be damaged by directly abutting against the main body of the decorative part 6, thereby reducing the damage of the adjusting ejector pin 502 to the automobile interior decoration during the demoulding process of the automobile decorative part 6. 4 is fixed in the groove to ensure that it will not fall off or move during use. Silicone has good flexibility and high temperature resistance, and is suitable for ejection applications in high-temperature injection molding environments. During the ejection process, the impact of the adjusting ejector pin 502 on the decorative part 6 is further alleviated, and the friction of the adjusting ejector pin 502 in the rib groove 2032 is reduced, thereby extending the service life of the mold 2. The abutting surface is parallel to the inclined surface of the rib groove 2032, which ensures the integrity of the molding of the rib 601, and further ensures the smoothness of the decorative part 6 when demolding.

[0051] Because the common automobile decorative part 6 is thin and long, a "cross"-shaped auxiliary runner 4 is opened at the center of the male mold core 2031, and the molten plastic in the injection gun 103 is filled with the molding cavity 3 along the four directions of the auxiliary runner 4, thereby avoiding the process in which the injection plastic flows from the gate 301 into the molding cavity 3. The rib groove 2032 in the molding cavity 3 and the bending of the molding fastener 602 are easily accumulated with the injection plastic, causing the pouring time at these places to be too long, thereby reducing the pouring time for the molten injection plastic to fill the molding cavity 3 of the automobile decorative part 6, weakening the influence of the long pouring time on the surface quality of the injection molded part, thereby The surface quality of the automobile decorative part 6 is improved. When the decorative part 6 is separated from the male mold core 2031, the ejector mechanism 5 can eject the injection plastic from the auxiliary runner 4 through the ejector pin 507 at the same time. After one injection molding is completed, the operator does not need to clean out the residual injection plastic from the male mold core 2031, which is convenient for the operator to clean the residual injection plastic, thereby ensuring the integrity of the decorative part 6. By arranging a stopper 402 at the discharge end 401 of the auxiliary runner 4 and opening a discharge hole 4021 in the stopper 402, the main body of the decorative part 6 outside the hole is obliquely ejected by the ejector mechanism 5 during the demoulding process. The injection plastic in the hole will be ejected from the top, and the injection plastic in the hole will not be able to follow the movement of the main body of the decorative part 6 due to the obstruction of the stopper 402, so that the injection plastic after cooling is separated from the decorative part 6, thereby avoiding the subsequent separation of the injection plastic and the decorative part 6 separately, and further ensuring the production efficiency of the injection molding machine. The shape of the injection plastic in the discharge hole 4021 is determined by the discharge hole 4021. By controlling the outer diameter of the injection plastic in the discharge hole 4021 when it is discharged into the molding cavity 3, it is gradually reduced in the direction close to the molding cavity 3, so that the thickness of this part of the injection plastic is smaller after cooling, so that it can be easily separated from the automotive decorative part 6 in the molding cavity 3. This avoids the problem of deformation of the area near the connection between the decorative part 6 and the injection plastic during demolding. By adding an upwardly protruding stepped boss 4022 between the discharge hole 4021 and the ejection hole 4023, the thickness of the injection plastic at the stepped boss 4022 is smaller than the injection plastic in the auxiliary runner 4. When the injection plastic is cooled, the ejector pin 507 is ejected from the discharge hole 4021, and the injection plastic here can be easily deformed and detached, thereby clearing the injection plastic in the discharge hole 4021. This avoids the problem of deformation of the area near the connection between the decorative part 6 and the injection plastic when it is separated from the injection plastic, thereby further ensuring the integrity of the surface of the decorative part 6.

[0052] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An injection molding machine for automobile decorative parts, comprising a base (1), a barrel (102), an injection molding gun (103) and a mold (2), wherein the injection molding gun (103) is mounted on the upper end surface of the base (1), the barrel (102) is connected to the rear end of the injection molding gun (103), the base (1) is also mounted with a mold (2), the front and rear ends of the mold (2) are covered with a sealing plate (201), the mold (2) comprises a male mold (203) and a female mold (202), the sealing plate (201) connects the injection molding gun (103) to the female mold (202) through an injection hole (2012), a female mold core (2021) is mounted in the female mold (202), and a male mold core (2031) is mounted in the male mold (203), characterized in that: The female mold core (2021) and the male mold core (2031) are nested with each other, and a molding cavity (3) is provided in the gap between them. The molding cavity (3) is used to mold the main body of the decorative part (6) and the fastener (602) on one side of the decorative part (6). An ejection mechanism (5) is provided between the male mold (203) and the sealing plate (201). The ejection mechanism (5) includes an adjustable ejector pin (502) and an ejection pin (507). The ejection mechanism (5) adjusts the preload force on the plurality of adjustable ejector pins (502) so that the ejection force applied by the adjustable ejector pins (502) to the decorative part (6) during demoulding is balanced. The male mold core (2031) is provided with a rib groove (2032) and an inclined top plate (2033), the rib groove (2032) is used to mold the ribs (601) on the back of the main body of the decorative part (6), and the inclined top plate (2033) is used to mold and separate the fasteners (602) on the decorative part (6). The male mold core is also provided with an auxiliary runner (4) to promote injection molding efficiency. The adjusting ejector pin (502) extends into the rib groove (2032) and abuts against the rib (601), and is connected to the inclined top plate (2033). The ejector pin (507) passes through the auxiliary runner (4).

2. The injection molding machine for automobile decorative parts according to claim 1, characterized in that: The ejection mechanism (5) further comprises an ejector plate (501), an ejector cavity (5011) is provided between the male mold (203) and the sealing plate (201), the ejector plate (501) is slidably mounted in the ejector cavity (5011), a plurality of adjusting ejector pins (502) are hingedly connected to the ejector plate (501), and correspond one to one with the positions of the rib grooves (2032), the adjusting ejector pins (502) comprise a cylinder 1 (5061), a cylinder 2 (5062), a cylinder 3 (5063) and an adjusting spring (5064), an ejector rod (503) is slidably connected in the cylinder 1 (5061), the upper and lower ends of the cylinder 2 (5062) are rotatably connected to the cylinder 1 (5061) and the cylinder 3 (5063), and the cylinder 3 (5063) is rotatably connected to the ejector plate (501). The cylinder 1 (5061) and the cylinder 2 (5062) are hingedly connected with an adjusting rod (5065) through internal threads, and the upper and lower ends of the adjusting spring (5064) are respectively connected to the ejector rod (503) and the adjusting rod (5065). A rotating shaft (2035) is also provided on the outer surface of the cylinder 1 (5061). A sliding groove (2036) slidably connected to the outer surface of the rotating shaft (2035) is provided in the inclined top plate (2033). A slideway (2037) with a trapezoidal inclined surface is provided on the inner wall of the male mold core (2031). The tail of the inclined top plate (2033) abuts against the slideway (2037). Multiple ejection springs (508) are arranged in a rectangular shape, and the two ends are respectively connected to the male mold (203) and the sealing plate (201).

3. The injection molding machine for automobile decorative parts according to claim 2, characterized in that: The auxiliary runner (4) is in a "cross" shape and is opened in the middle of the male mold core (2031) and is connected to the main body of the molded decorative part (6) on all sides. A discharge end (401) is provided at the connection point. The female mold core (2021) is provided with a gate (301) connected to the injection hole (2012). The center of the auxiliary runner (4) is located within the vertical projection plane of the gate (301).

4. The injection molding machine for automobile decorative parts according to claim 2, characterized in that: The upper end of the ejector rod (503) is also provided with a mounting groove (505), and an ejection silicone rubber (504) is fixedly connected to the mounting groove (505). The ejection silicone rubber (504) abuts against the rib (601), and the abutment surface is parallel to the inclined surface of the rib groove (2032).

5. The injection molding machine for automobile decorative parts according to claim 2, characterized in that: The inclined top plate (2033) is also provided with a groove (204) located at the molding fastener (602); a molding plate (205) is connected to the groove (204) via a molding spring (2041); the outer edge surface of the molding plate (205) is slidably connected to the inner edge surface of the groove (204); the left side of the molding plate (205) abuts against the fastener (602); a transition step (206) is provided on the male mold core (2031) to cooperate with the molding plate (205) to abut against the fastener (602); a guide surface (2061) is also provided on the step change section of the transition step (206); the guide surface (2061) is parallel to the contact surface of the molding plate (205).

6. The injection molding machine for automobile decoration parts according to claim 2, characterized in that: A compensating grinding plate (207) is also provided between the inclined top plate (2033) and the slideway (2037) at the joint. The compensating grinding plate (207) is connected to the inclined top plate (2033) via a compensating spring (2071). A guiding surface (2072) parallel to the trapezoidal inclined surface of the slideway (2037) is also provided on the lower side of the compensating grinding plate (207).

7. The injection molding machine for automobile decorative parts according to claim 3, characterized in that: The male mold core (2031) is also provided with an ejection hole (4023) on the bottom surface of the auxiliary runner (4), and the ejection hole (4023) is blocked by the ejection pin (507).

8. The injection molding machine for automobile decorative parts according to claim 3, characterized in that: The male mold core (2031) is provided with a stopper (402) at the discharge end (401) of the auxiliary runner (4), and four discharge holes (4021) connecting the auxiliary runner (4) and the molding cavity (3) are respectively opened in the stopper (402), and the discharge holes (4021) are arranged obliquely from the direction close to the molding cavity (3) to the direction away from the female mold (202).

9. The injection molding machine for automobile decorative parts according to claim 6, characterized in that: The diameter of the discharge hole (4021) gradually decreases in the direction approaching the forming cavity (3).

10. The injection molding machine for automobile decorative parts according to claim 6, characterized in that: The auxiliary runner (4) is provided with a stepped boss (4022) near the stopper (402), and the discharge hole (4021) and the ejection hole (4023) are located on the left and right sides of the stepped boss (4022).

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