Injection mold and device for automotive parts

Abstract

The application relates to the technical field of injection molding, and discloses an injection mold and device for automobile accessories, wherein the injection mold for automobile accessories comprises a forming mold, the forming mold is specifically divided into a fixed mold and a movable mold, a mold guide column is arranged between the fixed mold and the movable mold, and a demolding assembly is further arranged. The injection mold for automobile accessories is provided with the demolding assembly, when demolding, the push rod is retracted into the push hole by following the movement, in the process, the push rod is first separated from the plastic part in the injection cavity, and the influence on the deformation of the plastic part is small; with the movement of the push rod, the groove is exposed, and then the air pump injects air into all the communicating air holes through the inside of the middle box, thereby further reducing the adhesion area of the movable mold and the plastic part, laying a foundation for the subsequent complete demolding, so that the force applied by the push rod to the plastic part is smaller, the rapid demolding is completed, and the probability of the deformation of the plastic part is reduced.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection mold and apparatus for automotive parts. Background Technology

[0002] Injection molding technology, with its significant advantages such as high molding efficiency, strong adaptability to complex structures, and controllable manufacturing costs, has become a core supporting process for the large-scale production of automotive parts. It is widely used in the processing and manufacturing of key components such as bumpers, sensor housings, interior trim clips, and power battery housings. In the entire injection molding process, the ejector system, as the core actuator for demolding the plastic part, needs to accurately transmit the ejection force after the plastic part has cooled and solidified, so that the plastic part is freed from the constraints of the cavity and core.

[0003] As the automotive industry moves towards lightweighting and precision, the requirements for molding accuracy (dimensional tolerances must be controlled within ±0.01-0.03mm), appearance quality (such as no scratches or ejector pin marks on high-gloss interior parts), and production efficiency (cycle time ≤30 seconds / mold) of automotive parts are continuously increasing. Traditional ejector systems are gradually revealing three core technical pain points that urgently need to be addressed: mold adhesion, ejector pin-induced deformation of plastic parts, and frequent wear of ejector pins. These three issues are interconnected and form a vicious cycle, which seriously restricts the industry's technological upgrading process.

[0004] Firstly, there's the issue of mold sticking, which is particularly prominent and has complex causes in automotive parts manufacturing. On one hand, to meet structural strength and assembly requirements, automotive parts are generally designed with complex structures such as deep cavities, undercuts, and reinforcing ribs. Examples include the deep cavity housing of new energy vehicle battery casings and the snap-fit ​​undercuts of sensor housings. This results in a large-area, tight fit between the plastic part and the cavity / core. During cooling and solidification, the shrinkage of the plastic part generates a clamping force of 5-8 MPa, while the compressed air inside the cavity creates a negative pressure adsorption effect of 0.02-0.05 MPa, causing the plastic part to adhere firmly to the mold cavity surface. On the other hand, the glass fiber reinforced PP and PA66 composite materials commonly used in automotive parts increase the coefficient of friction between the plastic part and the mold surface due to their glass fiber particles. Furthermore, some plasticizers in these materials can form a sticky interface at high temperatures, further exacerbating the sticking phenomenon. Data shows that defects such as plastic part tearing and mold jamming caused by mold sticking account for more than 35% of the total defect rate. Addressing a single sticking problem requires a 10-20 minute downtime, severely impacting production efficiency.

[0005] Secondly, the deformation of plastic parts caused by ejector pins directly affects the product qualification rate: In order to solve the sticking problem, the industry often increases the ejector pin diameter or the number of ejector pins to increase the ejection force. However, this can easily lead to uneven distribution of ejection force. When the local ejection force exceeds the yield strength of the plastic material (such as the yield strength of ABS material of about 40MPa), obvious ejector pin marks will be formed on the surface of the plastic part, and may even cause the plastic part to warp or crack. For thin-walled automotive parts (such as interior trim strips with a wall thickness of only 0.8-1.2mm), the concentrated ejection force of traditional rigid ejector pins can easily cause local dent deformation.

[0006] The frequent wear of ejector pins, which accompanies the aforementioned problems, significantly increases mold maintenance costs and downtime. During high-frequency reciprocating motion, the ejector pin must simultaneously withstand compressive stress during the ejection stage (up to 10-15 MPa), sliding friction with the guide hole, and temperature fluctuations of 50-80°C during mold operation. This triple stress superposition leads to wear failure as the primary mode of failure. On one hand, the hard particles in the glass fiber reinforced material cause abrasive wear on the ejector pin surface, resulting in a monthly wear of 0.01-0.03 mm in the ejector pin diameter. This increases the clearance between the ejector pin and the guide hole from the initial 0.005-0.01 mm to over 0.03 mm, causing the ejector pin to wobble and exacerbating the deformation of the plastic part. On the other hand, untimely or improper lubrication can lead to dry friction between the ejector pin and the guide hole, with a friction coefficient as high as 0.3-0.5, reducing the ejector pin's service life to below 500,000 cycles. Statistics show that mold maintenance costs caused by ejector pin wear account for 60% of the total maintenance costs. Ordinary ejector pins need to be replaced on average every 500,000 cycles, with a single replacement costing about 2,000-5,000 yuan, and the replacement process requires downtime of 1-2 hours. Summary of the Invention

[0007] Given that traditional ejector systems have gradually revealed three core technical pain points that urgently need to be addressed—namely, mold sticking, ejector-induced deformation of plastic parts, and frequent wear of ejector pins—a new injection mold and device for automotive parts is proposed.

[0008] This application provides an injection mold and device for automotive parts, the purpose of which is to solve the problems of difficult demolding of plastic parts and severe wear of ejector pins by adopting a new demolding method.

[0009] The technical solution of the present invention is an injection mold for automotive parts, including a molding mold, which is specifically divided into a fixed mold and a moving mold. A mold guide post is provided between the fixed mold and the moving mold. The mold also includes a demolding assembly, which specifically includes a beam bridge provided on the side of the moving mold away from the fixed mold, a rear plate provided on the side of the beam bridge away from the moving mold, a middle box and a cover plate provided between the moving mold and the rear plate, a push hole that is opened through the side of the moving mold, an ejector rod provided inside the push hole, a groove provided on the inner wall of the push hole, and a connecting air hole opened inside the ejector rod.

[0010] The rear plate is U-shaped, and the cover plate fits the rear plate. One end of the push rod passes through the push hole and is flush with the opening of the push hole. The other end of the push rod passes through the cover plate and enters the middle box. The groove is located in the push hole on the side close to the fixed mold. Both ends of the connecting air hole pass through the push rod, with one end located in the groove and the other end located in the middle box.

[0011] Furthermore, the demolding assembly also includes a spring piston rod disposed inside the middle box and a limiting plate disposed outside the push rod;

[0012] The spring piston rod is fixedly connected to the connecting air hole, and the limiting plate is located between the cover plate and the moving mold. The limiting plate is distributed in a stepped manner according to the high and low levels.

[0013] Furthermore, the ditch surrounds the outside of the push rod.

[0014] Furthermore, a lubrication assembly is provided on the outside of the connecting air hole. The lubrication assembly specifically includes a mounting groove opened on the side of the cover plate near the middle box, a mounting block set in the mounting groove, an assembly insertion hole opened on the side of the mounting block away from the middle box, a sleeve set in the assembly insertion hole, a groove opened on the end of the sleeve near the cover plate, and an application ring set in the groove.

[0015] The mounting groove covers all the push holes, the assembly insertion hole corresponds to the push hole, the sleeve is annular, the push rod passes through the center of the coating ring and the sleeve, the coating ring is hollow and filled with lubricating oil.

[0016] Furthermore, the lubrication assembly also includes an oil reservoir cavity opened inside the sleeve, and a guide rod disposed between the oil reservoir cavity and the applicator ring;

[0017] The oil storage cavity is located above the central axis of the sleeve, and the lowest point inside the oil storage cavity is level with the highest point of the inner ring wall of the coating ring.

[0018] Furthermore, the inner ring wall of the coating ring is provided with coating holes arranged in a ring array, and the inner diameter of the coating ring is larger than the inner diameter of the sleeve.

[0019] Furthermore, the inner ring wall of the coating ring is embedded with balls arranged in a ring array.

[0020] Furthermore, the coating ring is located at the center line of the moving mold.

[0021] An injection molding device for automotive parts, adapted to an injection mold for automotive parts, includes a base, an injection molding machine and a power device disposed on the top of the base, a base disposed inside the power device, and an installation assembly. The base specifically includes two base plates for mounting the molding mold, a plate guide post disposed between the two base plates, and the installation assembly specifically includes a receiving groove formed on the surface of the base plates, a rotating seat disposed on the four sides of the inner wall of the receiving groove, a hydraulic piston rod disposed inside the rotating seat, a locking sleeve disposed on the side of the hydraulic piston rod away from the rotating seat, a positioning sleeve disposed inside the locking sleeve, a fixing insertion hole penetrating the side of the fixed mold, and a fixing bolt disposed between the fixing insertion hole and the positioning sleeve.

[0022] The receiving groove is U-shaped, the rotating seat is fixed to the inner ring wall of the receiving groove, the positioning sleeve is inserted into the fixing hole, and the fixing bolt passes through the fixing hole into the positioning sleeve.

[0023] Furthermore, the inner wall of the receiving groove is provided with a locking hole, and the fixing bolt passes through and enters the locking hole.

[0024] The beneficial effects of this invention are:

[0025] 1. By setting up a demolding assembly, during demolding, the moving mold moves away from the fixed mold, opening the injection cavity. Simultaneously, the middle box and cover plate retract synchronously, and the ejector rod moves and retracts into the push hole. During this process, the ejector rod first separates from the plastic part in the injection cavity. Because the adhesion area between the ejector rod and the plastic part is small, and the area around the push hole can provide support for the plastic part during separation, the separation of the ejector rod from the plastic part has little impact on the deformation of the plastic part. As the ejector rod moves, the channel is exposed, and the air pump injects air into all the connecting air holes through the inside of the middle box. The air flows into the injection cavity through the push hole. This process disrupts the negative pressure environment between the moving mold and the plastic part, weakening their adhesion. Simultaneously, air enters the injection cavity and diffuses outwards along the gap between the moving mold and the plastic part, centered on the ejector hole, aiding in the separation of the two parts. This further reduces the adhesion area between the moving mold and the plastic part, laying a foundation for complete demolding. This allows the ejector pin to apply less force to the plastic part, achieving rapid demolding while also reducing the probability of deformation. Subsequently, the ejector pin moves towards the plastic part, completely ejecting it from the injection cavity, achieving complete demolding.

[0026] 2. By setting a limiting plate, when the ejector rod pushes the plastic part out of the mold, the moving mold approaches the middle box, and the ejector rod gradually protrudes from the push hole and enters the injection cavity. During this process, the uppermost limiting plate contacts the moving mold first. Thus, the uppermost ejector rod begins to move with the moving mold and will no longer move into the injection cavity. Its length in the injection cavity remains constant. Subsequently, as the moving mold moves, the ejector rods stop moving in order from top to bottom, and their length in the injection cavity gradually increases from top to bottom, forming a stepped distribution. This enhances the ejector rod's ability to lift the plastic part, ensuring that the plastic part remains between the fixed mold and the moving mold after demolding, waiting for the operator to pick it up, preventing the plastic part from falling and causing inconvenience or damage and deformation.

[0027] 3. By setting up a lubrication component, the push rod slides in the push hole. When the push rod passes the coating ring, the coating ring will apply lubricating oil to the surface of the push rod to achieve lubrication. At the same time, the guide rod transfers the lubricating oil in the oil storage cavity to the coating ring. This not only replenishes the lubricating oil in the coating ring and extends the effective lubrication time, but also reduces the impact of the lubricating oil's own pressure in the oil storage cavity on the lubricating oil in the coating ring.

[0028] 4. By setting up a coating hole, the lubricating oil in the coating ring seeps out through the coating hole. Under the action of the surface tension of the oil, the lubricating oil will form a semi-circular oil droplet at the opening of the coating hole and remain for a long time. Under normal circumstances, the connecting vent will not come into contact with the seeping lubricating oil. As the oil droplet gradually grows larger, it will eventually come into contact with the push rod. This results in intermittent application of lubricating oil and excessive overflow of lubricating oil on the outside of the push rod.

[0029] 5. By setting up the installation components, when installing the molding mold, the molding mold is lifted by the suspension equipment and moved between the two base plates. Then, the hydraulic piston rod is moved to bring the positioning sleeve close to the molding mold so that the positioning sleeve is inserted into the fixing hole. When multiple positioning sleeves are inserted into the fixing hole, the hydraulic piston rod starts synchronously and extends outward. When the hydraulic piston rod has moved to its maximum stroke, the molding mold also moves to the installation position. This facilitates the positioning and installation of the molding mold and reduces the installation difficulty caused by the large weight of the molding mold. Attached Figure Description

[0030] Figure 1 This is a perspective view of the injection mold of the present invention;

[0031] Figure 2 This is an exploded view of the injection mold of the present invention;

[0032] Figure 3 This is a schematic diagram of the box in this invention;

[0033] Figure 4 This is an anatomical diagram of the box and cover plate in this invention;

[0034] Figure 5 This is a schematic diagram of the push rod and spring piston rod of the present invention;

[0035] Figure 6 This is a schematic diagram of the mounting block of the present invention;

[0036] Figure 7 This is a schematic diagram of the coating ring of the present invention;

[0037] Figure 8 This is a schematic diagram of the injection molding device of the present invention;

[0038] Figure 9 This is a schematic diagram of the base of the present invention;

[0039] Figure 10 This is an anatomical diagram of the base of the present invention;

[0040] Figure 11 This is a top view of the injection mold of the present invention;

[0041] Figure 12 For the present invention Figure 11 Sectional view at point AA;

[0042] Figure 13 For the present invention Figure 12 Schematic diagram of the demolding component;

[0043] Figure 14 For the present invention Figure 13 Enlarged view at point B in the middle;

[0044] Figure 15 For the present invention Figure 13 Enlarged view at point C;

[0045] Figure 16 For the present invention Figure 12 Enlarged view at point D;

[0046] Figure 17 This is a schematic diagram of the installation components of the present invention;

[0047] Figure 18 This is a schematic diagram of the hydraulic piston rod of the present invention.

[0048] In the picture:

[0049] 1. Molding mold; 11. Fixed mold; 12. Moving mold; 13. Mold guide post; 2. Demolding assembly; 21. Beam bridge; 22. Rear plate; 23. Middle box; 24. Cover plate; 25. Push hole; 26. Push rod; 27. Channel; 28. Connecting vent; 29. ​​Spring piston rod; 210. Limiting plate; 3. Lubrication assembly; 31. Mounting groove; 32. Mounting block; 33. Assembly socket; 34. Sleeve; 35. Insert groove; 36. Coating ring; 37. Coating hole; 38. Oil reservoir; 39. Guide rod; 4. Base; 5. Injection molding machine; 6. Power equipment; 7. Base; 71. Base plate; 72. Plate guide post; 8. Mounting assembly; 81. Receiving groove; 82. Rotating seat; 83. Hydraulic piston rod; 84. Locking sleeve; 85. Positioning sleeve; 86. Fixing socket; 87. Fixing bolt; 88. Locking hole. Detailed Implementation

[0050] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Example 1, referring to Figures 1-5 , Figures 11-15 This is the first embodiment of the present invention, which provides an injection mold for automotive parts, including a molding mold 1, which is specifically divided into a fixed mold 11 and a moving mold 12. A mold guide post 13 is provided between the fixed mold 11 and the moving mold 12. The mold also includes a demolding assembly 2, which specifically includes a beam bridge 21 disposed on the side of the moving mold 12 away from the fixed mold 11, a rear plate 22 disposed on the side of the beam bridge 21 away from the moving mold 12, a middle box 23 and a cover plate 24 disposed between the moving mold 12 and the rear plate 22, a push hole 25 penetrating on the side of the moving mold 12, an ejector rod 26 disposed inside the push hole 25, a groove 27 disposed on the inner wall of the push hole 25, and a connecting vent 28 disposed inside the ejector rod 26.

[0052] Specifically, the fixed mold 11 and the moving mold 12 are arranged in parallel. The fixed mold 11 and the moving mold 12 are closed to form an injection cavity. Four mold guide pillars 13 are provided and threadedly connected to the fixed mold 11. The mold guide pillars 13 penetrate the moving mold 12, allowing the moving mold 12 to slide along the mold guide pillars 13. The beam bridges 21 are arranged in a symmetrical pair. The moving mold 12, the beam bridges 21, and the rear plate 22 are bolted together and fixed. The rear plate 22 is U-shaped. A top platform is provided on the side of the rear plate 22 away from the middle box 23 to restrict the movement of the middle box 23. The top platform passes through the central hole of the rear plate 22. The cover plate 24 fits against the rear plate 22 and is fixed by bolts, forming a sealed space inside the middle box 23. An air pump is connected to the outside of the sealed space. The middle box 23 is slidably connected to the beam bridges 21. Push hole 25 Based on the mold opening style of the moving mold 12, the core principle is "balanced force, fit the structure, and avoid key points". It needs to be designed specifically in combination with the structural characteristics of automotive parts (such as deep cavity, undercut, thin wall), material characteristics (such as glass fiber reinforced material) and molding requirements (accuracy ±0.01-0.03mm). One end of the push rod 26 passes through the push hole 25 and is flush with the opening of the push hole 25. The other end of the push rod 26 passes through the cover plate 24 and enters the middle box 23. The channel 27 is located in the push hole 25 on the side close to the fixed mold 11. Both ends of the connecting air hole 28 pass through the push rod 26, one end is located in the channel 27 and the other end is located in the middle box 23. The channel 27 surrounds the outside of the push rod 26 so that the airflow can flow out evenly from the push hole 25.

[0053] By setting the demolding component 2, during demolding, the moving mold 12 moves away from the fixed mold 11, opening the injection cavity. Simultaneously, the middle box 23 and the cover plate 24 retract synchronously, and the ejector rod 26 retracts into the push hole 25. During this process, the ejector rod 26 first separates from the plastic part in the injection cavity. Because the adhesion area between the ejector rod 26 and the plastic part is small, and the periphery of the push hole 25 can provide support for the plastic part during separation, the separation of the ejector rod 26 from the plastic part has little impact on the deformation of the plastic part. As the ejector rod 26 moves, the channel 27 is exposed, and the air pump injects air through the interior of the middle box 23 into all the connecting air holes 28. The air then flows through the push hole 25... 5. Air flows into the injection cavity, thus disrupting the negative pressure environment between the moving mold 12 and the plastic part, weakening the adhesion between them. Simultaneously, after entering the injection cavity, air diffuses outwards along the gap between the moving mold 12 and the plastic part, centered on the push hole 25, assisting in the separation of the moving mold 12 and the plastic part. This further reduces the adhesion area between the moving mold 12 and the plastic part, laying a foundation for complete demolding. This allows the ejector rod 26 to apply less force to the plastic part, achieving rapid demolding while also reducing the probability of deformation. Subsequently, the ejector rod 26 moves towards the plastic part, completely ejecting it from the injection cavity, achieving complete demolding.

[0054] The demolding assembly 2 also includes a spring piston rod 29 disposed inside the middle box 23 and a limiting plate 210 disposed outside the push rod 26.

[0055] Specifically, the spring piston rod 29 is fixedly connected to the connecting air hole 28 by bolts. The spring piston rod 29 is integrated into a plate. The limiting plate 210 is fixed to the push rod 26 by bolts, which is convenient to adjust according to the usage requirements. The limiting plate 210 is located between the cover plate 24 and the moving mold 12. The limiting plate 210 is distributed in a stepped manner according to the high and low levels, and the higher up it is closer to the moving mold 12.

[0056] By setting a limiting plate 210, when the ejector rod 26 pushes the plastic part out of the mold, the moving mold 12 approaches the middle box 23, and the ejector rod 26 gradually protrudes from the push hole 25 and enters the injection cavity. During this process, the uppermost limiting plate 210 contacts the moving mold 12 first. Thus, the uppermost ejector rod 26 begins to move with the moving mold 12 and will no longer move into the injection cavity. Its length in the injection cavity remains constant. Subsequently, as the moving mold 12 moves, the ejector rod 26 stops moving in order from top to bottom, and its length in the injection cavity gradually increases from top to bottom, forming a stepped distribution. This enhances the lifting capacity of the ejector rod 26 on the plastic part, so that the plastic part remains between the fixed mold 11 and the moving mold 12 after demolding, waiting for the operator to pick it up, avoiding the plastic part from falling and causing inconvenience or damage and deformation.

[0057] Example 2, refer to Figures 1-7 , Figures 11-16 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a lubrication component 3 is provided on the outside of the connecting air hole 28. The lubrication component 3 specifically includes a mounting groove 31 opened on the side of the cover plate 24 near the middle box 23, a mounting block 32 disposed in the mounting groove 31, an assembly insertion hole 33 opened on the side of the mounting block 32 away from the middle box 23, a sleeve 34 disposed in the assembly insertion hole 33, a groove 35 opened on the end of the sleeve 34 near the cover plate 24, and an application ring 36 disposed in the groove 35.

[0058] Specifically, the push rod 26 passes through the mounting block 32, the mounting groove 31 covers all the push holes 25, the mounting block 32 is fixed in the mounting groove 31 by bolts, the assembly insertion hole 33 is set corresponding to the push hole 25, the sleeve 34 is annular, the push rod 26 passes through the center of the coating ring 36 and the sleeve 34, the coating ring 36 is hollow and filled with lubricating oil, the coating ring 36 is located at the center line of the moving mold 12, which facilitates the full lubrication of the push rod 26.

[0059] The lubrication assembly 3 also includes an oil reservoir 38 opened inside the sleeve 34, and a guide rod 39 disposed between the oil reservoir 38 and the applicator ring 36.

[0060] Specifically, the oil reservoir 38 is also filled with lubricating oil. The oil reservoir 38 is located above the central axis of the sleeve 34. The lowest point inside the oil reservoir 38 is flush with the highest point of the inner ring wall of the coating ring 36, so that the lubricating oil in the oil reservoir 38 can completely penetrate into the coating ring 36. The guide rod 39 is made of cotton, so that the lubricating oil in the oil reservoir 38 can penetrate into the coating ring 36 under the influence of capillary action. The sleeve 34 has injection and ventilation holes that communicate with the oil reservoir 38 on the outside.

[0061] By setting the lubrication component 3, the push rod 26 slides within the push hole 25. When the push rod 26 passes the coating ring 36, the coating ring 36 applies lubricating oil to the surface of the push rod 26, thus lubricating the push rod 26. At the same time, the guide rod 39 transfers the lubricating oil in the oil storage chamber 38 to the coating ring 36. This not only replenishes the lubricating oil in the coating ring 36 and extends the effective lubrication time, but also reduces the impact of the lubricating oil's own pressure in the oil storage chamber 38 on the lubricating oil in the coating ring 36.

[0062] The remaining structure is the same as that in Example 1.

[0063] Example 3, referring to Figures 1-7 , Figures 11-16 This is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that the inner ring wall of the applicator ring 36 is provided with applicator holes 37 arranged in a ring array. The diameter of the applicator holes 37 is no more than three millimeters. The difference in radius between the inner and outer ring walls of the internal space of the applicator ring 36 is no more than five millimeters. The inner diameter of the applicator ring 36 is larger than the inner diameter of the sleeve 34.

[0064] By setting the application hole 37, the lubricating oil in the application ring 36 seeps out through the application hole 37. Under the action of the surface tension of the oil, the lubricating oil will form a semi-circular oil droplet at the opening of the application hole 37 and remain there for a long time. Under normal circumstances, the connecting vent 28 will not come into contact with the seeping lubricating oil. As the oil droplet gradually grows larger, it will eventually come into contact with the push rod 26. This achieves intermittent application of lubricating oil and avoids excessive overflow of lubricating oil on the outside of the push rod 26.

[0065] The remaining structure is the same as that in Example 2.

[0066] Example 4, refer to Figures 1-7 , Figures 11-16 This is the fourth embodiment of the present invention. The difference between this embodiment and the second embodiment is that the inner ring wall of the applicator ring 36 is embedded with balls arranged in a ring array. The balls can rotate in place on the inner ring wall of the applicator ring 36. Part of the balls are located inside the applicator ring 36, and part of the balls are located outside the applicator ring 36 and are attached to the outer side of the push rod 26.

[0067] By setting ball bearings, when the push rod 26 moves, the ball bearings slide on the surface of the push rod 26, applying lubricating oil to the outside of the push rod 26, thus allowing precise control of the amount of lubricating oil applied.

[0068] The remaining structure is the same as that in Example 2.

[0069] Example 5, refer to Figures 8-18 The fifth embodiment of the present invention provides: an injection molding device for automotive parts, adapted to an injection mold for automotive parts, including a base 4, an injection molding machine 5 and a power device 6 disposed on the top of the base 4, a base 7 disposed inside the power device 6, and an installation assembly 8. The base 7 specifically includes two base plates 71 for mounting a molding die 1, and a plate guide post 72 disposed between the two base plates 71. The installation assembly 8 specifically includes a receiving groove 81 opened on the surface of the base plate 71, a rotating seat 82 disposed on the four sides of the inner wall of the receiving groove 81, a hydraulic piston rod 83 disposed inside the rotating seat 82, a locking sleeve 84 disposed on the side of the hydraulic piston rod 83 away from the rotating seat 82, a positioning sleeve 85 disposed inside the locking sleeve 84, a fixing insertion hole 86 penetrating the side of the fixed mold 11, and a fixing bolt 87 disposed between the fixing insertion hole 86 and the positioning sleeve 85.

[0070] Specifically, the power device 6 is used to control the movement of the substrate 71. The top platform is controlled by the power device 6. The fixed mold 11 and the moving mold 12 are fixed to the two substrates 71 respectively. The top of the base 4 is provided with a residual material collection pool. The receiving groove 81 is U-shaped. The rotating seat 82 is fixed to the inner ring wall of the receiving groove 81. The hydraulic piston rod 83 is rotatably connected to the rotating seat 82. The four hydraulic piston rods 83 are controlled synchronously. The hydraulic piston rod 83 is welded to the locking sleeve 84. The locking sleeve 84 is clamped on the outside of the positioning sleeve 85. The positioning sleeve 85 is inserted into the fixing hole 86. The fixing bolt 87 passes through the fixing hole 86 and enters the positioning sleeve 85.

[0071] By setting up the installation component 8, when installing the molding mold 1, the molding mold 1 is lifted by the suspension equipment and moved between the two base plates 71. Then, the hydraulic piston rod 83 is moved to bring the positioning sleeve 85 close to the molding mold 1, so that the positioning sleeve 85 is inserted into the fixing hole 86. When multiple positioning sleeves 85 are inserted into the fixing hole 86, the hydraulic piston rod 83 starts synchronously and extends outward. When the hydraulic piston rod 83 has moved to its maximum stroke, the molding mold 1 also moves to the installation position. This facilitates the positioning and installation of the molding mold 1 and reduces the installation difficulty caused by the large weight of the molding mold 1.

[0072] Specifically, the inner wall of the receiving groove 81 is provided with a locking hole 88, and the fixing bolt 87 passes through the locking hole 88. The fixing bolt 87 fixes the fixed mold 11 to the base plate 71, reducing the force on the hydraulic piston rod 83 and enabling it to remain stable for a long time.

[0073] The remaining structure is the same as that in Example 1.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An injection mold for automobile parts, comprising a forming mold (1), which is specifically divided into a fixed mold (11) and a movable mold (12), and a mold guide column (13) is arranged between the fixed mold (11) and the movable mold (12), characterized in that: It also includes a demolding assembly (2), which specifically includes a beam bridge (21) disposed on the side of the moving mold (12) away from the fixed mold (11), a rear plate (22) disposed on the side of the beam bridge (21) away from the moving mold (12), a middle box (23) and a cover plate (24) disposed between the moving mold (12) and the rear plate (22), a push hole (25) through the side of the moving mold (12), a push rod (26) disposed inside the push hole (25), a groove (27) disposed on the inner wall of the push hole (25), and a connecting air hole (28) disposed inside the push rod (26). The rear plate (22) is in the shape of a U-shape. The cover plate (24) fits against the rear plate (22). One end of the push rod (26) passes through the push hole (25) and is flush with the opening of the push hole (25). The other end of the push rod (26) passes through the cover plate (24) and enters the middle box (23). The channel (27) is located in the push hole (25) on the side close to the fixed mold (11). Both ends of the connecting air hole (28) pass through the push rod (26), with one end located in the channel (27) and the other end located in the middle box (23). The demolding assembly (2) also includes a spring piston rod (29) disposed inside the middle box (23) and a limiting plate (210) disposed outside the push rod (26). The spring piston rod (29) is fixedly connected to the connecting air hole (28), and the limiting plate (210) is located between the cover plate (24) and the moving mold (12). The limiting plates (210) are distributed in a stepped manner according to the high and low levels. The ditch (27) surrounds the outside of the push rod (26); A lubrication assembly (3) is provided on the outside of the connecting air hole (28). The lubrication assembly (3) specifically includes a mounting groove (31) opened on the side of the cover plate (24) near the middle box (23), a mounting block (32) set in the mounting groove (31), an assembly insertion hole (33) opened on the side of the mounting block (32) away from the middle box (23), a sleeve (34) set in the assembly insertion hole (33), a groove (35) opened on the end of the sleeve (34) near the cover plate (24), and an application ring (36) set in the groove (35). The mounting groove (31) covers all the push holes (25), the assembly insertion hole (33) corresponds to the push hole (25), the sleeve (34) is annular, the push rod (26) passes through the center of the coating ring (36) and the sleeve (34), the coating ring (36) is hollow and filled with lubricating oil; The lubrication assembly (3) also includes an oil reservoir (38) opened inside the sleeve (34) and a guide rod (39) disposed between the oil reservoir (38) and the applicator ring (36). The oil storage cavity (38) is located above the central axis of the sleeve (34), and the lowest point inside the oil storage cavity (38) is flush with the highest point of the inner ring wall of the coating ring (36).

2. The injection mold for automotive parts according to claim 1, characterized in that: The inner ring wall of the coating ring (36) is provided with coating holes (37) arranged in a ring array, and the inner diameter of the coating ring (36) is larger than the inner diameter of the sleeve (34).

3. The injection mold for automotive parts according to claim 1, characterized in that: The inner ring wall of the coating ring (36) is embedded with balls arranged in a ring array.

4. The injection mold for automotive parts according to claim 1, characterized in that: The coating ring (36) is located at the center line of the moving die (12).

Images