A large-scale reverse forming die for automobile

Abstract

This utility model discloses a large reverse molding mold for automobiles, including: a cavity and a core disposed above the cavity; a hot runner system is disposed on the core; after the core and cavity are closed, the hot runner nozzles of the hot runner system inject molten material directly into the cavity space between the core and the cavity from the back of the product to form the instrument panel body; it also includes an undercut demolding mechanism for demolding the product, the undercut demolding mechanism including: a spring block disposed on the cavity; a nitrogen spring fixed on the spring block; the piston rod of the nitrogen spring presses against the cavity; when the core and cavity are closed, the nitrogen spring is pre-tightened, and the spring block forms a surface on the cavity for undercut bottom end face forming; when the core and cavity are separated, the spring block moves upward in an outward tilting direction under the power provided by the nitrogen spring to complete demolding, thereby solving the problems of long front gate runners, many appearance defects, large mold volume, and high cost in the prior art; this utility model relates to the field of automotive injection mold technology.

Description

Technical Field

[0001] This utility model relates to the field of automotive injection mold technology, specifically a large reverse molding mold for automobiles. Background Technology

[0002] The dashboard is the mounting platform for various instruments and controls in modern automobiles. It is a crucial component in automobile manufacturing and assembly, and as it is directly presented to the driver and passengers, its aesthetics directly reflect the overall quality of the vehicle. Therefore, the importance of the dashboard is self-evident. The dashboard has a complex structure, numerous assembly dimensions, high precision requirements, and a large visible surface area.

[0003] Therefore, the mold manufacturing process requires high precision and high quality, and needs to take into account various aspects, especially cost and cycle time.

[0004] Traditional automotive large reverse molding dies use a front-feed method (i.e., the hot runner nozzle is set on the cavity to feed the melt onto the front of the corresponding product), resulting in the gate appearing on the front of the product, leading to poor product appearance quality. In addition, a demolding structure with a large core slider is usually used to demold the product, resulting in a large mold size and high mold manufacturing cost. Utility Model Content

[0005] To address the shortcomings and defects of existing technologies, a large reverse molding mold for automobiles is provided to solve the problems of long front gate runners, numerous appearance defects, large mold volume, and high cost in existing technologies.

[0006] A large reverse forming mold for automobiles, comprising: The mold cavity and the core disposed above the mold cavity, wherein a hot runner system is disposed on the core. After the core and cavity are molded together, the hot runner nozzle of the hot runner system injects the molten melt directly into the cavity space between the core and cavity from the back of the product to form the instrument panel body; It also includes an undercut demolding mechanism for demolding the product. The undercut demolding mechanism includes: The spring block is set on the cavity. A nitrogen spring is fixed to the spring block, and the piston rod of the nitrogen spring presses against the cavity. When the core and cavity are closed, the nitrogen spring is pre-tensioned, and the spring block forms a surface on the cavity for forming the undercut bottom end face. When the core and cavity are separated, the spring block moves upward in an outward tilting direction under the power provided by the nitrogen spring to complete the demolding.

[0007] With the above structure, the large reverse forming mold for automobiles of this utility model has the following advantages compared with the prior art: The hot runner system is set on the core. The hot runner nozzles of the hot runner system provide melt that is fed from the core, corresponding to the back of the product. This can shorten the length of the runner, maintain the supply pressure, make the melt fill uniformly, eliminate color difference and temperature difference lines, and hide the gate on the back. The appearance quality of the product is significantly improved, meeting the requirements of high-end automotive dashboards. The spring block is set on the cavity and moves upward in an outward tilting direction during mold parting via a nitrogen spring to complete the demolding. This demolding design replaces the traditional mold core large slider demolding structure, which reduces the size of the mold, makes it more compact, and reduces mold cost, molding cycle and maintenance workload.

[0008] As an improvement to this utility model, the inverted demolding mechanism further includes a pull block and a stop block. The pull block is fixed to the core, and the pull block is provided with a transversely extending transmission groove. The stop block is fixed on the spring block; During mold closing, the stop block moves along with the spring block and has a position for transmission engagement with the transmission groove. During demolding, the stop block moves along with the spring block and has a disengaged position from the transmission groove. When in the disengaged position, the core continues to move and the spring block stops moving.

[0009] As an improvement of this utility model, a downwardly opening groove is provided on the upper end face of the spring block, and the stop block is disposed in the groove and extends laterally within the groove.

[0010] As an improvement of this utility model, the stop block and the nitrogen spring are respectively arranged at intervals along the length direction on the spring block.

[0011] As an improvement of this utility model, the spring block is provided with a receiving space for accommodating the nitrogen spring, and the nitrogen spring is fixed in the receiving space.

[0012] As an improvement of this utility model, the cavity is provided with a T-shaped block, and the spring block is provided with a T-shaped groove. The T-shaped block and the T-shaped groove are combined to guide the movement of the spring block.

[0013] As an improvement of this utility model, the cavity is provided with a straight guide bar, and the spring block is provided with a straight groove. The straight guide bar and the straight groove are combined to guide the movement of the spring block.

[0014] As an improvement of this utility model, the back of the spring block is provided with a hardened iron beveled wear-resistant plate. The top surface of the spring block is equipped with a high-strength brass self-lubricating wear-resistant plate.

[0015] As an improvement of this utility model, the bottom surface of the spring block has two positioning grooves, and a positioning block is also provided between the two positioning grooves. The cavity is provided with a block that mates with the positioning groove, and a groove that mates with the positioning block. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the mold of this utility model.

[0017] Figure 2 This is a schematic diagram of the spring block structure of this utility model.

[0018] Figure 3 This is the utility model Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0019] Figure 4 This is the utility model Figure 3 Enlarged schematic diagram of the structure at point B.

[0020] Figure 5 This is a complete mold diagram of this utility model.

[0021] The following components are shown in the figure: 1. Cavity; 2. Core; 3. Hot runner nozzle; 4. Instrument panel body; 5. Spring block; 5.1. Surface; 5.2. Accommodation space; 5.3. T-slot; 5.4. Straight groove; 5.5. Positioning groove; 5.6. Positioning block; 6. Nitrogen spring; 6.1. Piston rod; 7. Pull block; 7.1. Transmission groove; 8. Stop block; 9. T-block; 10. Straight guide bar; 11. Wear-resistant plate. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Please see Figures 1-4 As shown, Figure 4 The direction of movement of one of the bullet blocks 5 is indicated by a red dashed line, and the direction of movement of the pull block 7 above that bullet block is indicated by a green dashed line.

[0024] A large reverse forming mold for automobiles, comprising: Cavity 1 and core 2 located above cavity 1, with a hot runner system provided on core 2. After the core 2 and the cavity 1 are closed, the hot runner nozzle 3 of the hot runner system injects the molten melt directly into the cavity 1 space between the core 2 and the cavity 1 from the back of the product to form the instrument panel body 4. It also includes an undercut demolding mechanism for demolding the product. The undercut demolding mechanism includes: Spring block 5 is set on cavity 1. Nitrogen spring 6 is fixed on spring block 5, and piston rod 6.1 of nitrogen spring 6 presses against cavity 1; When the core 2 moves downwards to close with the cavity 1, the nitrogen spring 6 is pre-tensioned, and the spring block 5 forms the mold surface 5.1 on the cavity 1 for forming the undercut bottom end face. When the core 2 moves upward and separates from the cavity 1, the spring block 5 loses its pressing or limiting function and moves upward in the outward tilting direction under the power provided by the nitrogen spring 6 to complete the demolding.

[0025] After the above improvements, the hot runner system is set on the core 2. The hot runner nozzle 3 of the hot runner system provides the melt from the core 2, which corresponds to the back of the product. This can shorten the length of the runner, maintain the supply pressure, make the melt fill uniformly, eliminate color difference and temperature difference lines, and hide the gate on the back. The appearance quality of the product is significantly improved, meeting the requirements of high-end automotive dashboards. The spring block 5 is set on the cavity 1 and moves upward in the outward tilting direction during mold parting by the nitrogen spring 6 to complete the demolding. The demolding design replaces the traditional mold core 2 large slider demolding structure, which reduces the size of the mold, makes it more compact, and reduces mold cost, molding cycle and maintenance workload.

[0026] Please see Figure 4 As shown, the undercut demolding mechanism also includes a pull block 7 and a stop block 8. The pull block 7 is fixed to the core 2 by a connector and is provided with a transversely extending transmission groove 7.1 (perpendicular to the moving direction of the core 2). The stop block 8 is fixed to the groove on the upper end face of the spring block 5 by screws and protrudes laterally. During the downward movement of the pull block 7 along with the core 2, the transmission groove 7.1 has a position laterally opposite to the stop block 8. Furthermore, the core 2 presses against the spring block 5, and the spring block 5 moves downward in the inward tilting direction (opposite to the upward movement in the outward tilting direction), and the stop block 8 can enter the transmission groove 7.1 to form force transmission; In the initial stage of mold opening, the pull block 7 moves upward with the core 2, and the stop block 8 moves upward in the outward tilting direction in sync with the spring block 5. During the movement, the stop block 8 can disengage from the transmission groove 7.1, the spring block 5 stops moving, and the core 2 continues to move upward.

[0027] The process of the spring block 5 disengaging from the cavity 1 is achieved through the combined action of the nitrogen spring 6, the pull block 7, and the stop block 8, ensuring the stable and reliable movement of the spring block 5.

[0028] A downward-facing groove is provided on the upper end face of the spring block 5, and the stop block 8 is disposed in the groove and extends laterally within the groove.

[0029] Embedding the stop block 8 in the groove of the spring block 5 can improve space utilization and make the structure more compact.

[0030] Please see Figure 4 As shown, multiple stop blocks 8 and nitrogen springs 6 are respectively arranged at intervals along the length direction on the spring block 5.

[0031] To improve the balance of demolding force, multiple nitrogen springs 6 and stops 8 are spaced apart along the length of the spring block 5.

[0032] Please see Figure 4 As shown, the spring block 5 is provided with a receiving space 5.2 for accommodating the nitrogen spring 6. The nitrogen spring 6 is fixed in the receiving space 5.2, and its piston rod 6.1 protrudes from the spring so as to maintain effective pressure against the core 2.

[0033] Embedding the nitrogen spring 6 within the accommodating space 5.2 on the spring block 5 can improve space utilization and make the structure more compact.

[0034] Please see Figures 1-4 As shown, the cavity 1 is provided with a T-shaped block 9, and the spring block 5 is provided with a T-shaped groove 5.3. The T-shaped block 9 and the T-shaped groove 5.3 are combined to serve as the first guide structure for guiding the movement of the spring block 5.

[0035] The cavity 1 is provided with a straight guide bar 10, and the spring block 5 is provided with a straight groove 5.4. The straight guide bar 10 and the straight groove 5.4 are combined to serve as a second guide structure to guide the movement of the spring block 5.

[0036] This ensures stable movement of the spring block 5, resulting in a high-quality product appearance after demolding.

[0037] The back of the spring block 5 is provided with a hardened iron inclined wear-resistant plate 11 to withstand the mold closing force and make the structure run stably and reliably. The top surface of the spring block 5 is provided with a high-strength brass self-lubricating wear-resistant plate 11 to reduce friction and extend the mold life.

[0038] The bottom surface of the spring block 5 has two positioning grooves 5.5, which are spaced apart along the length of the spring block 5. A positioning block 5.6 is also provided between the two positioning grooves 5.5 on the spring block 5. Cavity 1 is provided with a block that mates with positioning groove 5.5 and a groove that mates with positioning block 5.6 to maintain the positional accuracy of spring block 5 and make the structure highly reliable in operation.

[0039] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A large reverse forming mold for automobiles, characterized in that, include: A cavity (1) and a core (2) disposed above the cavity (1), wherein a hot runner system is disposed on the core (2). After the core (2) and the cavity (1) are molded together, the hot runner nozzle (3) of the hot runner system injects the molten melt directly into the cavity (1) space between the core (2) and the cavity (1) from the back of the product to form the instrument panel body (4). It also includes an undercut demolding mechanism for demolding the product. The undercut demolding mechanism includes: The spring block (5) is set on the cavity (1). A nitrogen spring (6) is fixed on a spring block (5), and the piston rod (6.1) of the nitrogen spring (6) presses against the cavity (1); When the core (2) and the cavity (1) are closed, the nitrogen spring (6) is pre-tightened, and the spring block (5) forms the mold surface (5.1) on the cavity (1) for the undercut bottom end face forming. When the core (2) and cavity (1) are separated, the spring block (5) moves upward in the outward tilting direction under the power provided by the nitrogen spring (6) to complete the demolding.

2. The automotive large reverse forming mold according to claim 1, characterized in that: The aforementioned undercut demolding mechanism also includes a pull block (7) and a stop block (8). The pull block (7) is fixed on the core (2), and the pull block (7) is provided with a transversely extending transmission groove (7.1). The stop block (8) is fixed on the spring block (5); During mold closing, the stop block (8) moves along with the spring block (5) and has a position for transmission engagement with the transmission groove (7.1). During demolding, the stop (8) moves along with the spring block (5) and is in a disengaged position from the transmission groove (7.1). When in the disengaged position, the core (2) continues to move and the spring block (5) stops moving.

3. The automotive large reverse forming mold according to claim 2, characterized in that: A downward-opening groove is provided on the upper end face of the spring block (5), and the stop block (8) is provided in the groove and extends laterally in the groove.

4. The automotive large reverse forming mold according to claim 2, characterized in that: The stop block (8) and the nitrogen spring (6) are respectively arranged at intervals along the length direction on the spring block (5).

5. The automotive large reverse forming mold according to claim 1, characterized in that: The spring block (5) is provided with a accommodating space (5.2) for accommodating the nitrogen spring (6), and the nitrogen spring (6) is fixed in the accommodating space (5.2).

6. The automotive large reverse forming mold according to claim 1, characterized in that: The cavity (1) is provided with a T-shaped block (9), and the spring block (5) is provided with a T-shaped groove (5.3). The T-shaped block (9) and the T-shaped groove (5.3) are combined to guide the movement of the spring block (5).

7. The automotive large reverse forming mold according to claim 1, characterized in that: The cavity (1) is provided with a straight guide bar (10), and the spring block (5) is provided with a straight groove (5.4). The straight guide bar (10) and the straight groove (5.4) are combined to guide the movement of the spring block (5).

8. The automotive large reverse forming mold according to claim 1, characterized in that: The back of the spring block (5) is provided with a hardened iron inclined wear-resistant plate (11). The top surface of the spring block (5) is provided with a high-strength brass self-lubricating wear-resistant plate (11).

9. A large reverse forming mold for automobiles according to claim 1, characterized in that: The bottom surface of the spring block (5) has two positioning grooves (5.5), and a positioning block (5.6) is also provided between the two positioning grooves (5.5). The cavity (1) is provided with a block that mates with the positioning groove (5.5) and a groove that mates with the positioning block (5.6).

Images