Square-iron-free, ejector-plate-free and die-thickness-contractible internal parting type bumper die

Abstract

The utility model discloses a square-iron-free ejector-plate-free internal parting bumper mold capable of reducing the mold thickness inwards, which comprises a large straight ejector, an inclined ejector, an insert, a bottom plate, a front mold body, a rear mold body and a demolding assembly, and the demolding assembly is embedded in the bottom plate and the rear mold body and is directly connected with the lower end face of the large straight ejector in a driving manner; the rear mold body is directly arranged on the bottom plate; a driving sliding groove is formed in the parting surface of the inclined ejector, a transmission sliding block is fixed to the lower end face of the large straight ejector, and the transmission sliding block is clamped in the driving sliding groove and can transversely slide along the driving sliding groove; according to the bumper mold, the demolding assembly is embedded, the straight ejector is directly driven, the straight ejector synchronously ejects out through the transmission sliding block, the demolding process is stable, the demolding quality is high, square iron, a straight ejector pin plate and an inclined ejector pin plate can be omitted, the thickness of the bumper mold is effectively reduced, and the bumper mold can be conveniently matched with an existing injection molding machine for batch production of the bumper mold.

Description

Technical Field

[0001] The utility model relates to the technical field of demoulding of internal parting molds, in particular to an internal parting bumper mold which has no square iron and ejector plate and can shrink the mold thickness. Background Art

[0002] With the development of automobile lightweight technology, automobile injection molding has been widely used. Automobile injection molding occupies a very important position in the field of injection molds. With the continuous bold innovation of automobile structural design, the molding molds of automobile injection molding also need to adapt and develop continuously; automobile plastic bumper is an important part of the car appearance. It has strength, rigidity and decorativeness. It can play a buffering role and protect the front and rear body when the car collides; the bumper injection molding model of the inner parting structure has a good appearance quality. Its surface is composed of a large straight top and an inclined top, such as Figure 1 As shown, the large straight ejector and the inclined ejector are provided with demoulding force by the large straight ejector pin plate 01 directly below the movable mold, and the lifting stroke is provided by the demoulding cylinder 02 externally mounted on the square iron 03. Therefore, the thickness dimension of the injection mold includes the height of the square iron. For extra-large and extra-high bumper products, the overall thickness of the injection mold will exceed the mold thickness range of the injection molding machine and cannot be matched with the injection molding machine for mass production. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide an inner-parting bumper mold without square iron and ejector plate and capable of shrinking the mold thickness, so as to solve one or more problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0005] The invention discloses an internally parted bumper mold with no square iron and ejector plate and capable of shrinking the mold thickness. The mold comprises a large straight top, an inclined top, an insert, a bottom plate, a front mold body and a rear mold body. The front mold body and the rear mold body are molded together and have an internal accommodating cavity. The large straight top and the inclined top are matched through a parting surface and are located between the front mold body and the rear mold body. The top surface of the large straight top and the side surface of the inclined top jointly form the inner surface of the bumper. A motion guide component is provided on the inner side surface of the inclined top. The motion guide component is positioned by the insert. The inner wall surface of the front mold body forms the outer surface of the bumper. The bumper mold also comprises a demoulding component, which is embedded and installed in the bottom plate and the rear mold body and directly driven and connected to the lower end surface of the large straight top. The rear mold body is directly arranged on the bottom plate. A driving slide groove is provided on the parting surface of the inclined top. A transmission slider is fixed on the lower end surface of the large straight top. The transmission slider is clamped in the driving slide groove and can slide laterally along the driving slide groove.

[0006] Specifically, the demoulding assembly includes a primary ejection unit and a secondary ejection unit for ejection in sequence; the primary ejection unit includes four primary oil cylinders and four primary connecting rods, the four primary oil cylinders are placed vertically, embedded in the bottom plate and the rear mold body, and distributed in a square lattice, the lower end of the primary connecting rod is in contact with the driving end of the primary oil cylinder, and is guided by the vertical primary guide hole set on the insert, and the upper end thereof is inserted and connected to the large straight top and pressed against the lower end surface of the large straight top; the secondary ejection unit includes four secondary oil cylinders Like the four secondary connecting rods, the four secondary oil cylinders are placed vertically, embedded in the base plate and the rear mold body, and distributed in a square lattice on the inner sides of the four primary oil cylinders. The lower end of the secondary connecting rod is drive-connected to the secondary oil cylinder and guided by the vertical secondary guide hole arranged on the insert. The upper end of the secondary connecting rod is extended by an extended guide rod, and the extended guide rod is slidably connected to the ejection guide hole vertically opened on the lower end face of the large straight top. When the secondary ejection occurs, the upper end face of the secondary connecting rod rises, approaches and presses on the lower end face of the large straight top.

[0007] Furthermore, the molding surface of the large straight top is separated by vertical through-cutting to form several independent small straight tops. The demoulding assembly also includes a three-stage ejection unit, which includes an ejection plate, four three-stage oil cylinders and several three-stage connecting rods. A guide groove is opened at the upper end of the insert, and the ejection plate is arranged in the guide groove and can slide vertically along the guide groove. The four three-stage oil cylinders are distributed in a square lattice and are inverted. The cylinder body is fixedly connected to the lower end of the large straight top, and the driving end is connected to the ejection plate. The three-stage connecting rod is arranged on the ejection plate, and the upper end thereof is fixedly connected to the lower end of the small straight top.

[0008] Furthermore, a positioning support surface for a large straight top is provided in the insert, and a guide slot is opened on the positioning support surface. The bottom protrusion of the slot is provided with a plurality of support protrusions flush with the positioning support surface for auxiliary support of the large straight top, and a clearance hole adapted to the support protrusion is provided on the ejection plate.

[0009] Furthermore, a limiting step circle is provided at the top end of the extended guide rod, which cooperates with the step surface in the ejection guide hole to prevent the extended guide rod from slipping.

[0010] Compared with the prior art, the utility model has an inner-parting bumper mold without square iron and ejector plate and can shrink the mold thickness. A demolding component is embedded in the mold and the straight ejector is directly driven to eject. The straight ejector is ejected synchronously through a transmission slider. Not only is the demolding process stable and the demolding quality high, but the square iron, straight ejector plate and inclined ejector plate can be eliminated, effectively reducing the thickness of the bumper mold, making it convenient to match the existing injection molding machine for mass production of bumper molds. At the same time, through the lightweight design of the bumper mold, its overall weight is greatly reduced, which is convenient for lifting and transportation. The mold has high direct economic benefits, simple structure, and universal applicability, and can be applied to all inner-parting bumper structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the bumper mold structure in the background technology;

[0012] Figure 2 It is a three-dimensional structural diagram of the bumper mold of the utility model (the front mold body is not shown);

[0013] Figure 3 This is a cross-sectional structural diagram of the bumper mold of the utility model;

[0014] Figure 4 It is a stereoscopic diagram of the assembly of the large straight top and the demoulding component;

[0015] Figure 5 for Figure 4 The assembly stereogram of the middle-level ejector unit;

[0016] Figure 6 for Figure 4 The assembly stereogram of the secondary ejection unit;

[0017] Figure 7 It is a stereoscopic diagram of the assembly of the rear mold body and the demoulding component;

[0018] Figure 8 for Figure 4 A three-dimensional diagram of the composition of the middle three-level ejection unit.

[0019] In the figure: 01, ejector plate; 02, demoulding cylinder; 03, square iron; 1, bottom plate; 2, rear mold body; 3, insert; 31, guide slide; 4, large straight ejector; 5, inclined ejector; 51, parting surface; 511, driving slide; 6, first-level ejector unit; 61, first-level cylinder; 62, first-level connecting rod; 7, second-level ejector unit; 71, second-level connecting rod; 711, extended guide rod; 72, second-level cylinder; 8, third-level ejector unit; 81, ejector plate; 82, third-level cylinder; 83, third-level connecting rod; 84, small straight ejector; 9, positioning column; 10, transmission slider. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only the best embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] The embodiment of the present invention is a square iron and ejector plate-free internal parting bumper mold with shrinkable mold thickness, such as Figure 2-Figure 8As shown, it includes a large straight top 4, an inclined top 5, an insert 3, a bottom plate 1, a front mold body and a rear mold body 2. The insert 3 is positioned by a positioning column 9 and fixed on the rear mold body 2. The lower end surface of the front mold body is concave to form the outer surface of the bumper. During the forming process, the front mold body falls and is molded with the rear mold body 2. Both have a containing cavity inside. The insert 3, the large straight top 4 and the inclined top 5 are all arranged in the containing cavity. The large straight top 4 and the inclined top 5 are matched through the parting surface 51 at the lower side. The top surface of the large straight top 4 and the side surface of the inclined top 5 are together. The inner surface of the bumper is constructed, and the injection molding cavity for injection molding of the bumper is constructed between the outer surface and the inner surface; the straight ejection and the inclined ejection 5 of the prior art are respectively driven by two ejector plates 01, which inevitably increases the total thickness of the mold. Therefore, the bumper mold in this embodiment cancels the two ejector plates 01, and cancels the square iron 03 supporting the rear mold body 2. The rear mold body 2 sits directly on the bottom plate 1, and the demoulding component is embedded and installed in the bottom plate 1 and the rear mold body 2, such as Figure 3 As shown, the demoulding component is directly driven to connect the lower end surface of the large straight top 4. Because the square iron 03 support and the lower ejector plate 01 are cancelled for driving, and the external demoulding cylinder 02 is improved to a built-in demoulding component, the demoulding stroke eliminates the occupation of the total thickness of the bumper mold, and the total thickness of the bumper mold is reduced. At the same time, the demoulding of the inclined top 5 is synchronously driven by the rising of the straight top, as shown in FIG. Figure 7 As shown, a driving groove 511 is provided on the parting surface 51 of the inclined top 5, and the transmission slide block 10 is clamped in the driving groove 511 and can slide laterally along the driving groove 511. The upper end of the transmission slide block 10 is fixedly connected to the lower end surface of the large straight top 4. During the demoulding process, the demoulding of the inclined top 5 is a combination of rising and lateral side shrinkage. The motion guide component cooperates with the track provided on the insert 3, and guides the composite demoulding movement of the inclined top 5 under the upward demoulding drive of the straight top;

[0022] In this embodiment, as a specific implementation of the demoulding component, Figure 2-Figure 7 As shown, the bumper ejection includes two-stage ejection, and the first-stage ejection and the second-stage ejection processes are respectively realized by the first-stage ejection unit 6 and the second-stage ejection unit 7, so as to reduce the accumulation of misalignment errors caused by the too long ejection stroke of the same ejection driving source and improve the demoulding quality; wherein, the first-stage ejection unit 6 ejects the large straight ejector 4, the inclined ejector 5 and the front mold body synchronously, and opens the mold after completing the first-stage ejection, and switches to the second-stage ejection after the front mold body is completely opened and separated. During the first-stage ejection and the second-stage ejection process, the inclined ejector 5 moves laterally along the parting surface 51 of the large straight ejector 4 and separates from the side of the bumper plastic part; again referring to Figure 5The first-level ejection unit 6 includes four first-level oil cylinders 61 and four first-level connecting rods 62. The four first-level oil cylinders 61 are vertically embedded in the bottom plate 1 and the rear mold body 2, and are distributed in a square lattice at the corners of the lower end surface of the straight top. A guide transmission hole is set at the lower end of the first-level connecting rod 62. The driving end of the first-level oil cylinder 61 slides with the guide transmission hole. During the first-level ejection, the driving end extends into the guide transmission hole to touch and apply pressure. A first-level guide hole is vertically set on the insert 3 for vertically guiding the first-level connecting rod 62. The upper end of the first-level connecting rod 62 is inserted into the lower end surface of the large straight top 4 and fixedly connected to directly drive the large straight top 4. The four first-level oil cylinders 61 are synchronously hydraulically driven by the same hydraulic system, and the oil pressure of each first-level oil cylinder 61 is monitored in real time during the ejection process to ensure that the four first-level oil cylinders 61 are synchronously and equally lifted; refer again Figure 6 The secondary ejection unit 7 includes four secondary oil cylinders and four secondary connecting rods 71. Similarly, the four secondary oil cylinders are vertically embedded in the bottom plate 1 and the rear mold body 2, and are distributed in a square lattice on the inner side of the four primary oil cylinders 61. The lower end of the secondary connecting rod 71 is fixedly connected to the driving end of the secondary oil cylinder, and is guided by the secondary guide hole vertically arranged on the insert 3. Similarly, the upper end of the secondary connecting rod 71 directly drives the lower end surface of the large straight ejector 4. Because the primary ejection ejects the large straight ejector 4 for a certain stroke, there is an empty stroke between the lower end surface of the large straight ejector 4 and the upper end of the secondary connecting rod 71. In order to guide the secondary ejection, the upper end of the secondary connecting rod 71 is detachably extended to set an extended guide rod 711. The long guide rod 711 is slidably connected to the ejection guide hole vertically opened on the lower end surface of the large straight ejector 4. In order to prevent the extended guide rod 711 from slipping off during the return process, a limited step circle is arranged on the top of the extended guide rod 711. The limited step circle is slidably matched with the ejection guide hole and is clamped on the step surface at the lower end of the ejection guide hole; during the second-level ejection, the upper end surface of the secondary connecting rod 71 rises to consume the idle stroke generated by the first-level ejection, and then touches the lower end surface of the large straight ejector 4, thereby entering the second-level ejection stroke of the large straight ejector 4; similarly, the four secondary oil cylinders are hydraulically driven synchronously by the same hydraulic system, and the oil pressure of each secondary oil cylinder is monitored in real time during the ejection process to ensure that the four secondary oil cylinders are lifted synchronously and equally.

[0023] In this embodiment, as a further implementation method, refer again to Figure 7-Figure 8, along the arc-shaped molding area of ​​the molding surface of the large straight top 4, the molding surface of this area is separated by vertical through-cutting to form several independent small straight tops 84, and the small straight tops 84 are linearly and evenly distributed along the arc-shaped molding direction, which are used to eject the bumper injection molded parts, so that the bumper injection molded parts are separated from the large straight top 4, which is convenient for the robot to take the material; the demoulding component also includes a three-stage ejection unit 8 for driving each small straight top 84 to synchronously lift, the three-stage ejection unit 8 includes an ejection plate 81, four three-stage oil cylinders 82 and several three-stage connecting rods 83, the insert 3 is provided with a return groove adapted to the lower end of the large straight top 4, and the bottom of the return groove is a landing support surface for supporting the lower end surface of the large straight top 4. When returning, the lower end of the large straight top 4 is guided by the return groove. When it is completely seated on the landing support surface, the large straight top 4 and the inclined top 5 are completed. A guide slot 31 is provided on the landing support surface, and the ejection plate 81 is arranged in the guide slot 31, and can be vertically moved along the guide slot 31 The top of the three-stage connecting rod 83 is fixedly connected to the lower end of the small straight top 84. When the ejection plate 81 is located at the bottom of the guide groove 31, the top surface of the small straight top 84 is combined with the large straight top 4 to form a continuous inner surface. The four three-stage oil cylinders 82 are distributed in a square lattice and are inverted. The bottom end surface of the cylinder body is embedded in the lower end surface of the large straight top 4, and the driving end is connected to the ejection plate 81. When the three-stage drive is on, the ejection plate 8 1 slides upward along the guide slide groove 31, and the three-stage connecting rod 83 drives the small straight ejector 84 to move upward synchronously, so as to eject the bumper plastic part and separate it from the molding surface of the large straight ejector 4; during the three-stage driving, the first-stage oil cylinder 61 and the second-stage oil cylinder maintain the original lifting state. After the material is taken out, the bumper mold starts to move downward to close the mold. At the same time, the three-stage ejection unit 8 returns to its position, the second-stage ejection unit 7 is reset, and the bumper mold is closed synchronously. The first-stage ejection unit 6 is reset by strong pressure.

[0024] In this embodiment, in order to increase the support surface and improve the support stability, the bottom protrusion of the guide slide groove 31 is provided with multiple support protrusions flush with the landing support surface, which are used to assist in supporting the large straight ejector 4. Correspondingly, the ejection plate 81 is provided with clearance holes adapted to the support protrusions.

[0025] The directional words such as "upper", "lower", "side", "bottom", "end", "lateral", "inner" and "outer" mentioned in this article are based on Figure 2-Figure 8 These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0026] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the terms "on" and "inside" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internally parted bumper mold with no square iron and no ejector plate and capable of shrinking the mold thickness, comprising a large straight top, an inclined top, an insert, a bottom plate, a front mold body and a rear mold body, wherein the front mold body and the rear mold body are molded together and have an internal accommodating cavity, the large straight top and the inclined top are matched through a parting surface and are located between the front mold body and the rear mold body, the top surface of the large straight top and the side surface of the inclined top jointly form the inner surface of the bumper, the inner side surface of the inclined top is provided with a motion guide component, the motion guide component is positioned by the insert, the inner wall surface of the front mold body forms the outer surface of the bumper, and is characterized in that: It also includes a demoulding component, which is embedded and installed in the base plate and the rear mold body, and is directly driven and connected to the lower end surface of the large straight top; the rear mold body is directly arranged on the base plate; a driving groove is arranged on the parting surface of the inclined top, and a transmission slider is fixed on the lower end surface of the large straight top, and the transmission slider is clamped in the driving groove and can slide laterally along the driving groove.

2. The inner-parting bumper mold without square iron and ejector plate and capable of shrinking the mold thickness according to claim 1 is characterized in that: The demoulding assembly includes a primary ejection unit and a secondary ejection unit for ejection in sequence; the primary ejection unit includes four primary oil cylinders and four primary connecting rods, the four primary oil cylinders are placed vertically, embedded in the bottom plate and the rear mold body, and distributed in a square lattice, the lower end of the primary connecting rod is in contact with the driving end of the primary oil cylinder, and is guided by the vertical primary guide hole set on the insert, and the upper end is fixedly connected to the lower end surface of the large straight ejector; the secondary ejection unit includes four secondary oil cylinders and four secondary connecting rods; Similarly, the four secondary oil cylinders are placed vertically, embedded in the base plate and the rear mold body, and distributed in a square lattice on the inner sides of the four primary oil cylinders. The lower end of the secondary connecting rod is drive-connected to the secondary oil cylinder and guided by the vertical secondary guide hole provided on the insert. The upper end of the secondary connecting rod is extended by providing an extended guide rod, and the extended guide rod is slidably connected to the ejection guide hole vertically opened on the lower end surface of the large straight top. During the secondary ejection, the upper end surface of the secondary connecting rod rises, approaches and presses against the lower end surface of the large straight top.

3. The inner-parting bumper mold without square iron and ejector plate and capable of shrinking the mold thickness according to claim 2 is characterized in that: The molding surface of the large straight top is separated by vertical through-cutting to form several independent small straight tops. The demoulding assembly also includes a three-stage ejection unit, which includes an ejection plate, four three-stage oil cylinders and several three-stage connecting rods. A guide groove is opened at the upper end of the insert, and the ejection plate is arranged in the guide groove and can slide vertically along the guide groove. The four three-stage oil cylinders are distributed in a square lattice and are inverted. The cylinder body is fixedly connected to the lower end surface of the large straight top, and the driving end is connected to the ejection plate. The three-stage connecting rod is arranged on the ejection plate, and the small straight top is fixedly installed on the top.

4. The inner-parting bumper mold without square iron and ejector plate and capable of shrinking the mold thickness according to claim 3 is characterized in that: The insert is provided with a landing support surface for supporting the large straight top, the guide slot is opened on the landing support surface, and the bottom protrusion of the slot is provided with a plurality of support protrusions flush with the landing support surface for auxiliary support of the large straight top, and the ejection plate is provided with a clearance hole adapted to the support protrusion.

5. The inner-parting bumper mold without square iron and ejector plate and capable of shrinking the mold thickness according to claim 2 is characterized in that: A limiting step circle is arranged at the top end of the extended guide rod, and the limiting step circle cooperates with the step surface at the lower end of the ejection guide hole to limit the position, so as to prevent the extended guide rod from slipping.

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