CN206796435U - A kind of secondary core extracting structure for preventing core from retreating - Google Patents

Abstract

The utility model discloses a secondary core-pulling structure capable of preventing the core from receding, which comprises a fixed mold and a movable mold, and a slidable secondary core-pulling slider is arranged on the movable mold. There is a slidable first-level core-pulling slider and an axially movable core-pulling core. The sliding direction of the first-level core-pulling slider is the same as that of the second-level core-pulling slider. The first-level core-pulling slider The front end of the core is provided with a T-shaped slot, and the rear end of the core-pulling core is provided with a T-shaped connector adapted to the T-shaped slot. The rear end of the primary core-pulling slider is connected to the piston rod of a core-pulling cylinder. When connecting and splitting the mold, the core-pulling cylinder makes the first-stage core-pulling slider slide backwards, thereby driving the core-pulling core to move back axially to complete the first-stage core-pulling; when the first-stage core-pulling slider moves backward, it drives the second The first-level core-pulling slider retreats to realize the second-level core-pulling. The utility model can adapt to two lateral core-pulling in any direction on the same lateral shape of the product, so as to avoid the retreat of the core-pulling core during molding.

Description

A secondary core-pulling structure that prevents the core from retreating

technical field

The utility model relates to an injection mold, in particular to a secondary core-pulling structure which can prevent the core from receding.

Background technique

Plastic products are very common in production and daily life, among which injection molding is the most common plastic product molding method, which usually includes a fixed mold on the upper side of the parting surface, a movable mold on the lower side of the parting surface, and a top plate, etc. , wherein the fixed mold is provided with a sprue sleeve, and the fixed mold and the movable mold are respectively provided with molding parts corresponding to the upper surface and the lower surface of the product. In order to make the molded product stay on the side of the movable mold, usually the molding part on the fixed mold is a cavity corresponding to the shape of the product, while the molding part on the movable mold is a core corresponding to the inner cavity of the product. When the injection mold is fixed on the injection molding machine, the injection head of the injection molding machine injects high-pressure molten plastic, and the plastic enters the molding cavity composed of the cavity and the core through the sprue of the fixed mold, and becomes the product after cooling , and then the movable mold, top plate, etc. move relative to the fixed mold to separate the mold, and the formed product stays on the core of the movable mold due to cooling and shrinkage. Products, thus completing one injection molding.

When the injection-molded product has lateral shapes such as lateral holes and grooves that have an included angle with the parting direction, it is necessary to set a corresponding core-pulling mechanism on the mold so that the core-pulling mechanism will The core used to form the lateral shape is pulled out first, so as to facilitate the separation of the movable mold and the fixed mold, and avoid the interference of the laterally formed core on the ejection of the product. The core-pulling mechanism usually uses mechanical structures such as inclined guide columns and inclined sliders, or hydraulic mechanisms such as hydraulic cylinders to drive the laterally formed cores and sliders to move laterally, thereby achieving lateral core-pulling. When the lateral shape on the product has a lateral hole structure that is different from the core-pulling direction of the lateral shape, two sets of lateral core-pulling mechanisms need to be provided. For example, a "slider inner core-pulling device for injection mold" disclosed in Chinese patent literature, its publication number is CN102248641A, specifically includes a horizontal core-pulling slider, a longitudinal core-pulling slider, a spring, a pulling rod, a reset rod , wherein the longitudinal core-pulling slider is arranged in the horizontal core-pulling slider. This mold structure is suitable for products with longitudinal holes in the lateral holes. When the mold is opened, the longitudinal core-pulling sliders set in the horizontal core-pulling sliders move first to achieve longitudinal core-pulling, so as to avoid When the horizontal core-pulling slider moves, the vertical core-pulling slider interferes with the product; then the horizontal core-pulling slider moves to realize horizontal core-pulling, so that the product can be core-pulled in both vertical and horizontal directions.

However, the above injection mold core-pulling mechanism that can realize core-pulling in two directions has the following problems. First, the core-pulling directions of the two core-pulling mechanisms intersect at 90 degrees, that is to say, it can only be molded and requires longitudinal core-pulling (consistent with the parting direction of the mold) and horizontal core-pulling (perpendicular to the parting direction of the mold), when the lateral shape on the product and the core-pulling direction of the lateral holes in the lateral shape are consistent with the core-pulling direction of the mold When the included angle of the parting direction is greater than 0 degrees and less than 90 degrees, the above-mentioned core-pulling mechanism will not be able to complete the core-pulling action. In particular, since two sets of independent core-pulling mechanisms are required for lateral core-pulling in two directions, the overall structure of the mold is complicated, the manufacturing cost is high, and it is not conducive to the cooperation and coordination of the actions of the two core-pulling mechanisms, which is easy to produce interfere with each other.

Utility model content

The purpose of this utility model is to solve the problems existing in the existing core-pulling structure of injection molds that it is difficult to adapt to two lateral core-pulling in any direction on the same lateral shape of the product, the mold structure is complex, and it is easy to interfere. Provide a two-stage core-pulling structure that can prevent the core from retreating. It is not only simple and reliable in structure, but also can adapt to two lateral core-pulling in any direction on the same lateral shape of the product, effectively avoiding core-pulling in two directions likely to interfere with each other.

In order to achieve the above object, the utility model adopts the following technical solutions:

A two-stage core-pulling structure that can prevent the core from retreating, including an upper fixed mold, a lower movable mold, and an ejection mechanism. part, a slidable secondary core-pulling slider is provided on the movable mold, and the secondary core-pulling slider is provided with a molding end corresponding to the lateral shape of the product that requires lateral core-pulling. The slider is equipped with a slidable first-stage core-pulling slider and a core-pulling core that can move axially and is used for forming a side hole groove of the product. The sliding direction of the first-stage core-pulling slider is the same as that of the secondary core-pulling The sliding direction of the block is the same, the front end of the lateral hole groove used for forming the product on the core-pulling core protrudes from the forming end of the secondary core-pulling slider, and the front end of the primary core-pulling slider is provided with a The sliding direction of the block is vertical to the T-shaped slot. The rear end of the core-pulling core is provided with a T-shaped connector that fits in the T-shaped slot. The rear end of the primary core-pulling slider is connected to the piston of a core-pulling cylinder. The rods are connected, and the fixed mold is provided with a back-stop structure that can lock the core-pulling core.

In the utility model, a slidable first-stage core-pulling slider is arranged in the laterally shaped secondary core-pulling slider for forming products, and the piston rod of the core-pulling oil cylinder used as the core-pulling power is connected to the first-stage core-pulling slider. on the core slider. In this way, when the core-pulling oil cylinder moves to start core-pulling, the first-stage core-pulling slider moves first, thereby driving the front-end core-pulling core to move to realize the first-stage core-pulling. When the first-level core-pulling slider moves in place, it can drive the second-level core-pulling slider to move, thereby realizing the second-level core-pulling. That is to say, the utility model can realize secondary core pulling through a core pulling oil cylinder. In particular, since the front end of the first-level core-pulling slider is provided with a T-shaped slot, and the rear end of the core-pulling core is provided with a T-shaped connector adapted to the T-shaped slot, it is not only convenient for the connection between the two. At the same time, an angle can be formed between the two. When the first-stage core-pulling slider moves, it can drive the core-pulling core to move axially to complete the core-pulling action. At the same time, the T-shaped connection at the rear end of the core-pulling core The head slides in the T-slot. Therefore, we can make the core-pulling direction of the core-pulling cylinder (that is, the moving direction of the primary core-pulling slider) the same as the sliding direction of the secondary core-pulling slider, and the moving direction of the core-pulling core is the same as that of the primary core-pulling slider. The moving direction of the block has an included angle. In this way, the core-pulling cylinder can directly drive the secondary core-pulling slider to move through the primary core-pulling slider to complete the secondary core-pulling, and the primary core-pulling slider can drive the core-pulling core to complete the second-stage core-pulling slide. One-stage core-pulling with inconsistent core-pulling directions of blocks can realize two core-pulling cores with different core-pulling directions on the same lateral shape of the product, and at the same time form a reliable core-pulling step to avoid the corresponding of two core-pulling At the same time, it can ensure the sequence of the first-level core-pulling and the second-level core-pulling, avoiding the second-level core-pulling when the first-level core-pulling is not completed, and then ensuring the set on the second-level core-pulling slider When the core-pulling core is back in place, the secondary core-pulling slider is retreating to pull the core, so as to avoid damage to the product due to the core-pulling core not in place during the secondary core-pulling. The utility model is provided with an anti-retreat structure capable of locking the core-pulling core on the fixed mold, so that the core-pulling core is in an axially locked state during molding to avoid its retreat.

Preferably, the rear end of the first-stage core-pulling slider is provided with a T-shaped connecting groove, and the end of the piston rod of the core-pulling cylinder is provided with a connecting disk, so that the end of the piston rod of the core-pulling cylinder is T-shaped The end of the piston rod provided with the connecting disk is slidably connected in the T-shaped connecting groove, and the extending direction of the T-shaped connecting groove is perpendicular to the axial direction of the piston rod.

The connecting disc can be conveniently connected to the end of the piston rod through bolts, so that the piston rod becomes a T-shape. Reduce the consistency requirement between the sliding direction of the primary core-pulling slider and the piston rod direction of the core-pulling cylinder, when there is a slight error between the sliding direction of the primary core-pulling slider and the piston rod direction of the core-pulling cylinder At the same time, the end of the sea plug can move in the T-shaped connecting groove of the first-level core-pulling slider, effectively avoiding the phenomenon of being stuck.

Preferably, a rectangular sliding groove is provided on the secondary core-pulling slider, and the primary core-pulling slider is located in the sliding groove, so that the sliding stroke of the primary core-pulling slider can be limited, and the sliding The two sides of the groove are respectively provided with slider pressing blocks, and the opposite sides of the slider pressing blocks are provided with sliding grooves, and the two sides of the first-level core-pulling slider are respectively provided with sliding parts that are slidably connected in the sliding grooves on the corresponding side. rails.

The rectangular sliding groove is not only convenient for processing and manufacturing, but also can well limit the moving distance of the primary core-pulling slider, and is conducive to reducing the overall size of the mechanism. In particular, the slider clamping block can be easily installed by bolts, and at the same time facilitates the machining of the sliding groove.

Preferably, the anti-retraction structure includes a positioning rod vertically arranged on the fixed mold, and a guide hole through the forming end is provided on the secondary core-pulling slider, and the core-pulling core is slidably connected in the guide hole. The second-stage core-pulling slider is also provided with an insertion hole passing through the guide hole. The core-pulling core is provided with a positioning card hole at a position corresponding to the insertion hole, and the positioning rod passes through the insertion hole vertically and Fit in the positioning card hole.

When the mold is closed, the positioning rod set on the fixed mold can pass through the insertion hole vertically and fit in the positioning card hole, so that the core-pulling core can be reliably positioned in the axial direction and avoid the occurrence of back phenomenon.

Therefore, the utility model has the following beneficial effects: not only is the structure simple and reliable, but also can adapt to two lateral core-pulling in any direction on the same lateral shape of the product, effectively avoiding the mutual interaction easily produced by the core-pulling in two directions. Interference, and can prevent the core pull core from backing up during molding.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model.

Fig. 2 is a partial cross-sectional view of the utility model at the second-stage core-pulling slider.

Fig. 3 is a schematic diagram of the connection structure of the primary core-pulling slider and the secondary core-pulling slider.

In the figure: 1, fixed mold 11, positioning rod 2, top plate 21, ejector rod 3, movable template 31, feet 32, movable mold backing plate 4, movable mold pressing plate 5, secondary core-pulling slider 51, sliding groove 52 , slider pressing block 521, sliding groove 53, guide hole 54, core-pulling core 541, T-shaped connector 542, positioning card hole 55, socket hole 6, primary core-pulling slider 61, slide rail 62, T Type slot 63, T shape connecting groove.

detailed description

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1 and Figure 2, a two-stage core-pulling structure that can prevent the core from retreating is suitable for a lateral shape that requires lateral core-pulling while having a lateral hole that requires lateral core-pulling products, and the core-pulling direction of the lateral shape and the core-pulling direction of the lateral hole slot are inconsistent, that is, the large slider used to form the lateral shape and the core or small slider used to form the lateral hole slot The core needs to be pulled in different directions, and the core or the small slider that forms the side hole groove needs to be separated from the product first, and then the large slider can be cored, so as to avoid Interference with cores or small sliders that remain in the lateral bore slots of the product.

Specifically, the secondary core-pulling structure of the injection mold includes an upper fixed mold 1, a lower movable mold, and an ejection mechanism arranged on one side of the movable mold. The fixed mold is provided with a molding part corresponding to the upper surface of the product, and the fixed mold has a parting surface on the underside. The movable mold then includes a movable template 3 and a movable mold pressing plate 4 arranged on the lower side of the movable template. The movable template is provided with a molding part corresponding to the lower surface of the product, and the upper side of the movable template has a parting surface. In addition, in the middle of the lower side of the movable template, a through groove is set through the front and rear sides, thereby forming the feet 31 on the left and right sides of the movable template and the movable mold backing plate 32 on the lower side of the feet, and the through groove forms a ejection space. A top plate 2 is arranged in the ejection space, and a number of ejector pins 21 are arranged on the top plate corresponding to the position of the forming part of the movable template, thereby forming an ejection mechanism, so as to eject the product after the product is molded and divided. Of course, in order to facilitate processing, the movable formwork, the movable formwork backing plate and the feet can be made into split structures and fixedly connected together with bolts.

In the utility model, the core-pulling mechanism of the product is arranged on one side of the movable mold. Specifically, a slidable secondary core-pulling slider 5 is arranged on the movable template. The corresponding forming end of the lateral shape in order to realize the core pulling of the lateral shape. It should be noted that in this embodiment, the side of the fixed mold is called the upper side, and the side of the movable mold is called the lower side. Correspondingly define the left and right sides or the horizontal direction. When the mold is used on a horizontal injection molding machine, the up and down direction is the horizontal direction. Since the basic structure of the injection mold belongs to the prior art in this field, it will not be described too much here. In addition, the lateral shape of the product that requires lateral core-pulling and the lateral hole slots are inclined toward the side of the movable mold, and the inclination angles of the two are inconsistent. Therefore, the secondary core-pulling slider moves from the forming end to the rear end One side of the moving mold pressing plate is inclined.

In order to realize the core-pulling of the lateral hole slots, we need to set a rectangular sliding groove 51 on the upper side of the secondary core-pulling slider, and set a primary core-pulling slider 6 that can slide back and forth in the sliding groove. Specifically, as shown in FIG. 3 , slider pressing blocks 52 can be respectively provided on both sides of the sliding groove, and sliding grooves 521 are respectively arranged on the opposite sides of the two sliding block pressing blocks, and then the two sides of the first-stage core-pulling slider Slide rails 61 slidably connected in the sliding grooves on the corresponding side are respectively provided on each side, so that the primary core-pulling slider and the secondary core-pulling slider have the same sliding core-pulling direction. In addition, a guide hole 53 with one end passing through the forming end and the other end passing through the sliding groove is provided on the secondary core-pulling slider, and a core-pulling core 54 that can move axially is arranged in the guide hole, and the axial direction of the core-pulling core There is an included angle between the moving direction and the moving direction of the primary core-pulling slider. The front end of the forming end of the secondary core-pulling slider protrudes from the core-pulling core to form the lateral hole groove of the product. The core-pulling core The rear end stretches into the sliding groove. In addition, a T-shaped slot 62 perpendicular to the sliding direction of the primary core-pulling slider is provided at the front end of the primary core-pulling slider, and a T-shaped slot 62 adapted to fit in the T-shaped slot is provided at the rear end of the core-pulling core. Connector 541. Further, the rear end of the first-level core-pulling slider is provided with a T-shaped connecting groove 63 perpendicular to the sliding direction of the first-level core-pulling slider, and an obliquely arranged core-pulling cylinder 7 is arranged on the movable template, and the piston of the core-pulling cylinder The end of the rod 71 is bolted to a connecting disc 72, so that the end of the piston rod of the core-pulling cylinder is T-shaped, and the end of the piston rod with the connecting disc is slidably connected in the T-shaped connecting groove, so that the core-pulling cylinder It can drive the first-stage core-pulling slider to move back and forth.

It should be noted that, in this embodiment, one end of the primary core-pulling slider, the secondary core-pulling slider, etc. used for forming is defined as the front end, and the rear end and both sides are defined accordingly.

When the mold is divided after the product is formed, the movable mold and the fixed mold are separated, and the core-pulling cylinder first drives the first-level core-pulling slider to slide backward, and the first-level core-pulling slider drives the core-pulling mandrel back until the core-pulling core The front end of the core retracts into the forming end of the second-level core-pulling slider. At this time, the T-shaped connector of the core-pulling core slides in the T-shaped slot, thereby completing the first-level core-pulling of the product; when the first-level core-pulling slider When it moves back into place in the sliding groove, it drives the secondary core-pulling slider back and separates the forming end from the lateral shape of the product, thereby realizing the secondary core-pulling of the product. At this time, the core-pulling core and the secondary The core-pulling slider moves back synchronously; then the ejector mechanism ejects the product, and the operator removes the product to complete a molding process; when the movable mold and the fixed mold start to close the mold, the core-pulling cylinder first drives the first-stage core-pulling The slider slides forward in the sliding groove, and the first-stage core-pulling slider drives the core-pulling core shaft to move forward and extend out of the forming end. At this time, the T-shaped connector of the core-pulling core slides in the T-shaped slot ; When the first-level core-pulling slider moves forward in the sliding groove, it will drive the second-level core-pulling slider to move forward until the second-level core-pulling slider is reset. At this time, the core-pulling core and the second-level core-pulling The slider moves forward and resets synchronously, and then the movable mold and the fixed mold are clamped in place, so that the injection molding of the next product can start.

In order to avoid the retreat phenomenon of the core-pulling core during the injection molding process, we can set a stop structure on the fixed mold that can lock the core-pulling core. Specifically, the stop structure includes a vertically arranged on the fixed mold. The positioning rod 11 and the secondary core-pulling slider are provided with an insertion hole 55 vertically downwards through the guide hole, and the core-pulling core is provided with a positioning card hole 542 at a position corresponding to the insertion hole. When starting to close the mold, the core-pulling cylinder first passes through the first-level core-pulling slider to completely reset the core-pulling core and the second-level core-pulling slider, and then the movable mold and the fixed mold are clamped in place, and the positioning rod set on the fixed mold is It can pass through the insertion hole vertically and fit in the positioning card hole, so that the core-pulling core can be reliably positioned in the axial direction, and the retreat phenomenon during molding can be avoided. When the mold is divided, when the movable mold and the fixed mold are separated, the positioning rod is separated from the core-pulling core, thereby releasing the locking of the core-pulling core, and the core-pulling cylinder can start to complete the first-level core-pulling cylinder through the first-level core-pulling slider. core and secondary core pull.

Claims (4)

1. A two-stage core-pulling structure that can prevent the core from retreating, including an upper fixed mold, a lower movable mold and an ejection mechanism. The forming part of the product is characterized in that a slidable secondary core-pulling slider is provided on the movable mold, and the secondary core-pulling slider is provided with a molding end corresponding to the lateral shape of the product that requires lateral core-pulling , there is a slidable primary core-pulling slider in the secondary core-pulling slider, and a core-pulling core that can move axially and is used for the lateral hole groove of the molded product. The sliding direction of the primary core-pulling slider The sliding direction is the same as that of the secondary core-pulling slider. The front end of the lateral hole groove on the core-pulling core for molding products protrudes from the forming end of the secondary core-pulling slider. The front end of the primary core-pulling slider is provided with A T-shaped slot perpendicular to the sliding direction of the primary core-pulling slider. The rear end of the core-pulling core is provided with a T-shaped connector adapted to the T-shaped slot. The rear end of the primary core-pulling slider is connected to the The piston rods of a core-pulling oil cylinder are connected, and the fixed mold is provided with a back-stop structure capable of locking the core-pulling core. 2. A secondary core-pulling structure capable of preventing the core from receding according to claim 1, wherein the rear end of the primary core-pulling slider is provided with a T-shaped connecting groove, and the core-pulling cylinder The end of the piston rod is provided with a connecting disc, so that the end of the piston rod of the core-pulling cylinder is T-shaped, and the end of the piston rod with the connecting disc is slidably connected in the T-shaped connecting groove, and the extension of the T-shaped connecting groove The direction is perpendicular to the axial direction of the piston rod. 3. A secondary core-pulling structure capable of preventing the core from receding according to claim 1, wherein the secondary core-pulling slider is provided with a rectangular sliding groove, and the primary core-pulling The slider is located in the sliding groove, so that the sliding stroke of the primary core-pulling slider can be limited. The two sides of the sliding groove are respectively provided with slider pressing blocks, and the opposite sides of the sliding block pressing blocks are provided with sliding grooves. The two sides of the first-stage core-pulling slider are respectively provided with slide rails slidably connected in the slide grooves on the corresponding side. 4. A two-stage core-pulling structure capable of preventing the core from retreating according to claim 1, wherein the anti-retreat structure includes a positioning rod vertically arranged on the fixed mould, and the two-stage core-pulling slide The block is provided with a guide hole through the forming end, the core-pulling core is slidably connected in the guide hole, and an insertion hole penetrating the guide hole is also provided on the secondary core-pulling slider, and the core-pulling core is in the corresponding The location of the insertion hole is provided with a positioning card hole, and the positioning rod vertically passes through the insertion hole and fits in the positioning card hole.