CN105856519B - A kind of twice core pulling structure of light-strip mould - Google Patents

Abstract

The invention provides a secondary core-pulling structure of a light guide strip mold, which belongs to the technical field of mold manufacturing. It solves the technical problems such as product damage easily caused when the existing mold core is pulled. The light guide strip mold includes a fixed mold and a movable mold. The fixed mold and the movable mold are arranged opposite to each other and can form a cavity. There is a limit rod in the hole, one end of the limit rod is connected with a core-pulling rod facing the cavity, the other end of the limit rod is provided with a spring, and the two ends of the spring act on the limit rod and the movable mold respectively; the limit rod There is a limit boss on the outer peripheral surface of the mounting hole, and a hole platform abutting against the limit boss is provided on the inner wall of the mounting hole. The invention has a short core-pulling distance, effectively prevents partial top cracking of the light guide strip product, and the side wall of the matching hole is not easy to be scratched.

Description

A secondary core-pulling structure of a light guide strip mold

technical field

The invention belongs to the technical field of mold manufacturing, and relates to a mold for producing an automobile light guide strip, in particular to a secondary core-pulling structure of the light guide strip mold.

Background technique

Mold is a tool used in industrial production for injection molding, blow molding, extrusion, die casting, smelting, stamping and other methods to obtain the required products. The mold has a specific contour or inner cavity shape; the application of the contour shape with cutting edges can separate the blank according to the contour line shape, and the application of the inner cavity shape can make the blank obtain a corresponding three-dimensional shape, which has the advantages of simple processing, high efficiency, and the ability to obtain complex Shaped products and other advantages are widely used; the mold generally includes two parts, the movable mold and the fixed mold, which can be separated or combined. The light guide strip is an important part of the car, which has an irregular shape and is usually molded by injection molding. After the car light is refracted by the light guide strip, it forms a light band and emits it, and changes the intensity and color of the light according to the light source. It is not only beautiful and practical, but also energy-saving and environmentally friendly. The injection molding quality of the light guide teeth on the light guide strip is directly related to the light shape and intensity of the headlights. At present, most of the demoulding methods of the mold use the ejector pin to eject, and the core pulling action is required before demoulding.

Chinese patent (notification number: 202517631U, publication date: 2012.11.07) discloses a secondary core-pulling structure of a new type of mold, including slider seat, first core-pulling, second core-pulling, product, iron hook, product outer wall The first core-pulling is provided, and the inner wall of the product is provided with the second core-pulling; the second core-pulling is fixed on the slider seat through the planting plate and screws, and at the same time, the first core-pulling and the second core-pulling are connected to the slider seat through three-section screws The slider seat is provided with an oblique guide column, a 7-shaped iron block, and the 7-shaped iron block and the T-shaped iron block form an iron pull hook; the T-shaped iron block is fixed on the template, and the tail end of the T-shaped iron block is connected to one end of the spring. connection, the other end of the spring is connected with the template; at the same time, the front end of the T-shaped iron block is set in the slot of the planting plate, and the slot of the planting plate is set on the planting plate; the side of the T-shaped iron block is in contact with the first core-pulling.

The core-pulling distance of the mold structure disclosed in the above-mentioned patent documents is too long, and the automotive light guide strip has higher requirements on the smoothness of the light-emitting surface. Moreover, its texture is relatively brittle, and it is prone to partial capping of the product or damage to the side wall of the mating hole.

Contents of the invention

The present invention aims at the above-mentioned problems existing in the existing technology, and provides a secondary core-pulling structure of the light guide strip mold. The technical problem to be solved by the present invention is: how to prevent the local capping of the light guide strip product and the core-pulling distance from being too long As a result, the side wall of the mating hole was shoveled.

The purpose of the present invention can be achieved through the following technical solutions:

A secondary core-pulling structure of a light guide strip mold, the light guide strip mold includes a fixed mold and a movable mold, the fixed mold and the movable mold are arranged opposite to each other and can form a mold cavity, characterized in that the secondary core-pulling structure It includes an installation hole opened on the movable mold facing the cavity and communicating with the cavity, a limit rod is provided in the installation hole, and one end of the limit rod is connected with a core-pull facing the cavity The other end of the limiting rod is provided with a spring and the two ends of the spring respectively act on the limiting rod and the movable mold; the outer peripheral surface of the limiting rod has a limiting boss, The inner wall of the mounting hole has a hole platform abutting against the limiting boss.

The principle is as follows: When the mold is opened, the gear is opened first, and the movable mold and the fixed mold are still stuck to each other. When the mold is doing core-pulling movement, it pulls inward, and the spring at the end of the limit rod pushes the limit rod to the shape through the elastic restoring force. The direction of the cavity is pushed, so that the core-pulling rod on the limit rod is closely attached to the movable mold core, that is, in the first core-pulling process, neither the core-pulling rod nor the limit rod performs core-pulling movement, and only the other internal pumps do the core-pulling. Core movement. After a certain distance of inner core pulling, the limit rod moves under the push of the spring until the limit boss of the limit rod touches the hole platform on the inner wall of the installation hole. At this time, the first core pulling is completed; the mold continues to pull core , because the limit boss of the limit rod is in contact with the hole platform, and the limit rod is limited by the hole platform on the inner wall of the installation hole, the limit rod and the core-pulling rod cannot continue to be maintained by the spring and the movable mold core Close to the state, when the moving mold moves, it drives the limit rod, the core-pulling rod and the inner pump to do the core-pulling movement, that is, the second core-pulling action, until the platform where the tie rod is installed contacts the platform on the bottom plate, the second pumping The core is completed, and the core-pulling rod is completely separated from the light guide strip product at this time; the entire core-pulling action is completed. In this technical solution, the core-pulling process is divided into two stages. During the second core-pulling process, the core-pulling rod does the core-pulling movement, which reduces the core-pulling distance of the core-pulling rod and ensures the smooth ejection of the product. out. Due to the short core-pulling distance, it can effectively prevent local cracking of the light guide strip product, and the side wall of the matching hole is not easy to be scratched.

The core-pulling distance of the core-pulling rod is less than the core-pulling distance of the inner core (that is, the opening distance of the mold), so that the parts with high tightness on the light guide strip product can be completely pulled away, and the product can be ejected smoothly; this technical solution solves the problem of PMMA material injection molded parts Due to the tight force of the product during ejection, the product is partially capped and the core-pulling distance is too long, resulting in the problem that the side wall of the mating hole is easily scratched.

In the above-mentioned secondary core-pulling structure of the light guide strip mould, a pull rod capable of moving toward the cavity is also provided in the movable mold, and the end of the pull rod has a position-limiting flange. It has a limit surface that can limit the moving distance of the tie rod. When the mold is closed, the distance between the limit boss on the limit rod and the hole platform in the installation hole is smaller than the limit flange The distance from the limiting surface. When the pull rod moves towards the cavity, the limit surface can be against the limit flange; when the core is pulled for the first time, the spring under the limit rod always sticks the limit rod to the movable mold core, so that the core pull rod first Do not do core-pulling movement, and other internal pumps do core-pulling work; when the limit boss on the limit rod contacts the hole platform for the second core-pulling, the core-pulling rod and other internal pumps pull core together until The limit flange of the pull rod is in contact with the limit surface, and the core-pulling rod is separated from the product, thus completing the whole core-pulling action.

In the above-mentioned secondary core-pulling structure of the light guide strip mold, when the mold is closed, the distance between the limiting boss on the limiting rod and the hole platform in the mounting hole is 10mm, and the The distance between the limiting flange and the limiting surface is 15mm. The core-pulling distance of the inner core is 10mm. After the first core-pulling is completed, the distance between the limit flange and the limit surface of the tie rod is 5mm. When the core is pulled for the second time, the core-pulling rod, the limit rod, the inner drawer and the pull rod Move 5mm together to complete the whole core pulling action.

In the above-mentioned secondary core-pulling structure of the light guide strip mold, one end of the installation spring of the limiting rod is the lower end, and the other end is the upper end, and the diameter of the lower end of the limiting rod is smaller than the diameter of the upper end of the limiting rod. The spring is sleeved on the lower end of the limit rod, the outer peripheral surface of the limit rod has an annular protrusion and one side of the annular protrusion forms the limit boss, and the annular protrusion is close to the The lower end of the limit rod. The core-pulling rod is connected to the upper end of the limit rod through the fastening screw, and the core-pulling rod and the limit rod are fixed by the fastening screw to prevent the core-pulling rod from rotating. At the same time, the limit rod is also treated with anti-rotation.

In the above-mentioned secondary core-pulling structure of the light guide strip mold, a pressure plate is fixed on the movable mold, one end of the spring abuts against the pressure plate, and the other end abuts against the ring-shaped protrusion. on the other side. The pressure plate can be fastened by screws or bolts and is connected to the base plate in the moving mold.

In the above-mentioned secondary core-pulling structure of the light guide strip mould, the movable mold includes a movable template and a bottom plate, the movable template and the bottom plate are provided with movable mold guide sleeves and guide posts, and the bottom plate is also provided with a top Out of the limit column, the side of the bottom plate is provided with a movable mold heat insulation board. There are garbage nails and cup-head screws used to connect the guide posts on the bottom plate. An ejector plate that can drive the ejector rod is arranged on the movable template. There are garbage nails between the bottom plate and the ejector plate to produce a small The gap prevents that when there is garbage between them, the ejector rod and the core cannot be reset, and plastic parts cannot be formed.

In the above-mentioned secondary core-pulling structure of the light guide strip mold, the fixed mold includes a fixed template and a panel, a hot runner frame plate is provided between the fixed template and the panel, and a fixed mold is also provided on the side of the panel. A heat shield and a positioning ring, and a fixed mold guide sleeve is also arranged in the fixed template.

Compared with the prior art, the core-pulling process is divided into two stages in the present invention by designing the structure of the core-pulling rod and the limit rod. During the second core-pulling process, the core-pulling rod does the core-pulling movement , which reduces the core-pulling distance of the core-pulling rod and ensures the smooth ejection of the product. Due to the short core-pulling distance, it can effectively prevent local cracking of the light guide strip product, and the side wall of the matching hole is not easy to be scratched.

Description of drawings

Fig. 1 is a structural schematic diagram of the mold clamping state of the light guide strip mold.

Fig. 2 is a partial enlarged view of A in Fig. 1 .

Fig. 3 is a structural schematic diagram of the light guide strip mold after the first core pulling.

Fig. 4 is a partial enlarged view of B in Fig. 3 .

Fig. 5 is a schematic structural view of the light guide strip mold after the second core pulling.

FIG. 6 is a partially enlarged view at point C in FIG. 5 .

Fig. 7 is a schematic diagram of the connection structure of the limit rod and the core-pulling rod in the closed state of the light guide strip mold.

In the figure, 1, moving mold; 1a, bottom plate; 1b, garbage nail; 1c, moving formwork; 1d, ejection limit column; 1e, moving mold heat insulation board; 2. Fixed mold; 2a, fixed template; 2b, panel; 2c, hot runner frame plate; 2d, fixed mold heat shield; 2e, positioning ring; 2f, fixed mold guide sleeve; 3, ejector plate; 4, core pulling Rod; 5, limit rod; 5a, limit boss; 5b, annular protrusion; 6, cavity; 7, mounting hole; 7a, hole platform; 8, pull rod; 8a, limit flange; 9 , Limiting surface; 10, fastening screw; 11, spring; 12, pressure plate.

detailed description

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

As shown in Figure 1, Figure 3 and Figure 5, the light guide strip mold includes a fixed mold 2 and a moving mold 1, the fixed mold 2 and the moving mold 1 are arranged opposite to each other and can form a cavity 6, and the secondary core-pulling structure includes a moving mold The installation hole 7 facing the cavity 6 and communicating with the cavity 6 opened on 1, a limit rod 5 is provided in the installation hole 7, and one end of the limit rod 5 is connected with a core-pulling rod 4 facing the cavity 6, and the limit The other end of the rod 5 is provided with a spring 11 and the two ends of the spring 11 respectively act on the limit rod 5 and the movable mold 1; The hole platform 7a that abuts against the limit boss 5a; further, the movable mold 1 includes a movable template 1c and a bottom plate 1a, and the movable template 1c and the bottom plate 1a are provided with a movable mold guide sleeve 1f and a guide post 1g, and the bottom plate 1a There is also an ejection limit column 1d, and a movable mold heat insulation board 1e is provided on the side of the bottom plate 1a. The bottom plate 1a is also provided with garbage nails 1b and cup head screws for connecting the guide post 1g, the movable template 1c is provided with an ejector plate capable of driving the ejector rod, and garbage nails are arranged between the bottom plate 1a and the ejector plate 1b, a small gap is created to prevent the ejector rod and core from being reset and plastic parts cannot be formed when there is garbage between them; the fixed mold 2 includes a fixed template 2a and a panel 2b, between the fixed template 2a and the panel 2b A hot runner frame plate 2c is provided, and a fixed mold heat insulating plate 2d and a positioning ring 2e are provided on the side of the panel 2b, and a fixed mold guide sleeve 2f is also provided in the fixed template 2a.

When the mold is opened, the gear is first opened, and the movable mold 1 and the fixed mold 2 are still stuck to each other. When the mold is doing core-pulling movement, it pulls inward, and the spring 11 at the end of the limit rod 5 uses the elastic restoring force to push the limit rod 5 to the opposite direction. The cavity 6 is pushed in the direction so that the core-pulling rod 4 on the limit rod 5 is in close contact with the movable mold 1, that is, the core-pulling rod 4 and the limit rod 5 do not perform core-pulling movement during the first core-pulling process. , only the other internal pumps do core-pulling exercises. After pulling the core for a certain distance, the limit rod 5 moves under the push of the spring 11 until the limit boss 5a of the limit rod 5 abuts against the hole platform 7a on the inner wall of the installation hole 7. At this time, the core is pulled for the first time. Complete; the mold continues to pull the core, because the limit boss 5a of the limit rod 5 is in contact with the hole platform 7a, the limit rod 5 is limited by the hole platform 7a on the inner wall of the installation hole 7, and the limit rod 5 And the core-pulling rod 4 cannot continue to rely on the spring 11 to keep close to the core of the movable mold 1. When the movable mold 1 moves, it drives the limit rod 5, the core-pulling rod 4 and the inner pump to perform the core-pulling movement, that is, the second core-pulling The action is only until the platform on which the pull rod 8 is installed contacts the platform on the bottom plate 1a, and the second core pulling is completed. At this time, the core pulling rod 4 is completely separated from the light guide strip product; the entire core pulling action is completed. In this embodiment, the core-pulling process is divided into two stages. During the second core-pulling process, the core-pulling rod 4 does the core-pulling movement, which reduces the core-pulling distance of the core-pulling rod 4 and ensures the product’s reliability. Ejected smoothly. Due to the short core-pulling distance, it can effectively prevent local cracking of the light guide strip product, and the side wall of the matching hole is not easy to be scratched.

As shown in Figures 1 to 6, the movable mold 1 is also provided with a tie rod 8 that can move toward the cavity 6, the end of the tie rod 8 has a limit flange 8a, and the movable mold 1 has a stopper that can limit the moving distance of the pull rod 8. Limiting surface 9, when the mold is closed, the distance between the limiting boss 5a on the limiting rod 5 and the hole platform 7a in the installation hole 7 is smaller than the distance between the limiting flange 8a and the limiting surface 9 . When the tie rod 8 moves towards the cavity 6, the limit surface 9 can abut against the limit flange 8a; when the core is pulled for the first time, the spring 11 under the limit rod 5 always connects the limit rod 5 to the movable mold 1 Closely attached, so that the core-pulling rod 4 does not perform core-pulling movement first, and the other internal pumps do core-pulling work; when the limit boss 5a on the limit rod 5 contacts the hole platform 7a for the second core-pulling, The core-pulling rod 4 is pulled together with other internal pullers until the limit flange 8a of the pull rod 8 contacts the limit surface 9, and the core-pulling rod 4 is separated from the product, thereby completing the entire core-pulling action; The distance between the limiting boss 5a on the limiting rod 5 and the hole platform 7a in the mounting hole 7 is 10mm, and the distance between the limiting flange 8a and the limiting surface 9 is 15mm. The inner core-pulling distance is 10mm. The first core-pulling is completed. At this time, the distance between the limit flange 8a of the tie rod 8 and the limit surface 9 is 5mm. When the core is pulled for the second time, the core-pulling rod 4 and the limit rod 5 , inner pumping and pull rod 8 move 5mm together to complete the whole core pulling action.

As shown in Figure 7, one end of the spring 11 installed on the limiting rod 5 is the lower end, and the other end is the upper end. On the outer peripheral surface of the limiting rod 5 there is an annular protrusion 5b and one side of the annular protrusion 5b forms a limiting boss 5a, and the annular protrusion 5b is close to the lower end of the limiting rod 5 . The core-pulling rod 4 is connected to the upper end of the limit rod 5 through the fastening screw 10, and the core-pulling rod 4 and the limit rod 5 are fixed by the fastening screw 10 to prevent the core-pulling rod 4 from rotating. Anti-rotation treatment: a pressing plate 12 is fixed on the movable mold 1, one end of the spring 11 leans against the pressing plate 12, and the other end leans against the other side of the annular protrusion 5b. The pressing plate 12 can be fastened by screws or bolts, and is connected to the bottom plate 1 a in the movable mold 1 .

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (7)

1. a kind of twice core pulling structure of light-strip mould, light-strip mould includes cover half (2) and dynamic model (1), the cover half (2) It is oppositely arranged with dynamic model (1) and die cavity (6) can be formed, it is characterised in that the twice core pulling structure includes opening on dynamic model (1) If the direction die cavity (6) and the mounting hole (7) that is connected with the die cavity (6), be provided with gag lever post in the mounting hole (7) (5), one end of the gag lever post (5) is connected with the core_pulling pole (4) towards the die cavity (6), the other end of the gag lever post (5) Two ends provided with spring (11) and the spring (11) are respectively acting on the gag lever post (5) and the dynamic model (1)；The limit Having on the outer peripheral face of position bar (5) on positive stop lug boss (5a), the inwall of the mounting hole (7) has and the positive stop lug boss (5a) The hole position platform (7a) leant.

2. the twice core pulling structure of light-strip mould according to claim 1, it is characterised in that in the dynamic model (1) also Provided with the pull bar (8) that can be moved towards the die cavity (6), the end of the pull bar (8) has defining flange (8a), described dynamic The confined planes (9) of the pull bar (8) displacement can be limited by having on mould (1), during matched moulds state, on the gag lever post (5) Positive stop lug boss (5a) and the mounting hole (7) in the distance between hole position platform (7a) be less than the defining flange (8a) with The distance between described confined planes (9).

3. the twice core pulling structure of light-strip mould according to claim 2, it is characterised in that described during matched moulds state The distance between hole position platform (7a) in positive stop lug boss (5a) and the mounting hole (7) on gag lever post (5) is 10mm, described The distance between defining flange (8a) and the confined planes (9) are 15mm.

4. the twice core pulling structure of the light-strip mould according to claim 1 or 2 or 3, it is characterised in that the gag lever post (5) one end for installing spring (11) is lower end, and the other end is upper end, and the diameter of gag lever post (5) lower end is less than gag lever post (5) The diameter of upper end, the spring (11) is set on the lower end of gag lever post (5), has ring on the outer peripheral face of the gag lever post (5) The one side of shape projection (5b) and the annular projection (5b) forms the positive stop lug boss (5a), and the annular projection (5b) is close to institute State the lower end of gag lever post (5).

5. the twice core pulling structure of light-strip mould according to claim 4, it is characterised in that solid on the dynamic model (1) Provided with pressing plate (12), one end of the spring (11) is resisted against on the pressing plate (12), and the other end is resisted against the annular projection On the another side of (5b).

6. the twice core pulling structure of the light-strip mould according to claim 1 or 2 or 3, it is characterised in that the dynamic model (1) include being provided with dynamic model guide pin bushing (1f) and guide pillar in moving platen (1c) and bottom plate (1a), the moving platen (1c) and bottom plate (1a) Ejection limited post (1d) is additionally provided with (1g), the bottom plate (1a), the side of the bottom plate (1a) is provided with dynamic model thermal insulation board (1e).

7. the twice core pulling structure of the light-strip mould according to claim 1 or 2 or 3, it is characterised in that the cover half (2) include solid plate (2a) and panel (2b), hot flow path deckle board (2c), institute are provided between the solid plate (2a) and panel (2b) The side for stating panel (2b) is additionally provided with cover half thermal insulation board (2d) and centring ring (2e), and being additionally provided with cover half in the solid plate (2a) leads Cover (2f).