Mold with layered floating mechanism

Abstract

Molds equipped with a layered floating mechanism belong to the field of thermoplastic molding molds. They are mainly used in the ejection mechanism of molds for plastic products with complex shapes or densely distributed reinforcing ribs. The mold opening force and the tension of spring 12 cause the moving mold plate 1 and the moving mold pad 2 to separate. The linear motion of the moving mold pad 2 drives the floating insert 4 to float, achieving partial demolding of the plastic product and reducing the clamping force during the ejection process. The positioning rod 6 supports and limits the center insert 5, ensuring that the center insert 5 remains unchanged during the movement of the floating insert 4, preventing the injection molded product from being scratched. This mechanism effectively utilizes the mold space, simplifies the mold structure, ensures smooth ejection of the plastic product, prevents the generation of defective products caused by the clamping force of the injection molded product, and ensures stable mold movement, shortening the molding cycle and improving production efficiency.

Description

Technical Field

[0001] The invention belongs to the field of thermoplastic plastic molding molds and relates to a mold with a layered floating mechanism. The mold is mainly used for the mold ejection mechanism of plastic products with complex shapes or densely distributed reinforcing ribs to ensure the layered ejection of the plastic product after injection molding while protecting the mold strength and service life. Background Art

[0002] The injection mold is divided into seven major systems, namely, mold guide system, support system, molding part system, pouring system, ejector system, cooling system and exhaust system. The ejector system involves the ejection method of the product. The ejector mechanism should be smooth, flexible and reliable, with sufficient strength and wear resistance. The ejector mechanism is very important for the performance assurance of the product. For plastic products with complex shapes or densely distributed ribs, conventional ejector mechanisms cannot guarantee the appearance quality of plastic products in mass production. Summary of the invention

[0003] The purpose of the present invention is to provide a mold with a layered floating mechanism, which relies on the action of a spring and the floating mechanism to achieve layered demoulding of local molded inserts of plastic products, ensure smooth production of plastic products, and prevent plastic products from sticking to the mold and being pulled.

[0004] The technical problem to be solved by the present invention is to provide a mold with a layered floating mechanism to solve the problems existing in the ejection process during the production of plastic product molds with complex shapes or densely distributed reinforcing ribs, ensure a smooth ejection process of the plastic product, and make the surface of the plastic product meet the technical requirements and usage requirements.

[0005] The technical scheme of the present invention is: the structure of the mold with a layered floating mechanism includes: a movable mold plate 1, a movable mold pad 2, a movable mold insert 3, a floating insert 4, a center insert 5, a positioning rod 6, a positioning screw sleeve 7, a screw plug 8, a movable mold insert 9, a push rod 10, a shoulder bolt 11 and a spring 12; the connection relationship is that the movable mold plate 1 and the movable mold pad 2 are in surface contact and connected by guide pillars and guide sleeves, the movable mold insert 3 is in surface contact and tightly matched with the movable mold plate 1 and is locked and fixed by bolts, the positioning screw sleeve 7 is provided with an external thread, an external hanging platform, a hanging platform countersunk hole and an internal thread, the positioning rod 6 is provided with a chamfer and a hanging platform, the center insert 5 is provided with a positioning hole, an oil groove and an exhaust hole, the external thread provided on the positioning screw sleeve 7 is threadedly connected and fixed to the movable mold plate 1, and the positioning screw sleeve 7 is provided with a positioning hole, an oil groove and an exhaust hole. The external hanging platform is in contact with the moving template 1 and limited in position, the hanging platform set on the positioning rod 6 is in contact with the hanging platform countersunk surface set on the positioning screw sleeve 7 and limited in position, the screw plug 8 is in contact with the internal thread surface set on the positioning screw sleeve 7 and is threadedly connected and fixed, the positioning rod 6 is in contact with the screw plug 8 and limited in position, and the chamfer set on the positioning rod 6 plays a role of introduction during the assembly process, the central insert 5 is cylindrical in shape, and the floating insert 4 is cylindrical in shape. The floating insert 4 is provided with an oblong hole, a countersunk hole, a through hole, a threaded hole, an oil groove and an external hanging platform, the outer surface of the central insert 5 is in contact and sliding cooperation with the countersunk surface set on the floating insert 4, and the oil grooves set on the central insert 5 are distributed on the outer surface of the central insert 5, and the relative sliding of the central insert 5 and the floating insert 4 The vent hole provided on the central insert 5 is connected with the positioning hole, the vent hole provided on the central insert 5 is connected with the through hole provided on the floating insert 4, the through hole provided on the floating insert 4 is connected with the threaded hole, so as to ensure that the gas in the mold cavity is discharged in time during the molding process to ensure the quality of the plastic product, the central insert 5 is provided with a positioning hole which is in surface contact with the positioning rod 6 and is tightly matched, the oblong hole provided on the floating insert 4 is in clearance match with the positioning rod 6, the distance between the two centers of the oblong hole is greater than the floating distance of the floating insert 4, the external hanging platform provided on the floating insert 4 is in surface contact with the moving mold plate 1, the floating insert 4 is in surface contact and sliding match with the moving mold insert 3, the oil groove provided on the floating insert 4 plays a lubricating role in the floating process, the floating insert 4 and The movable plate 1 has a clearance fit, the floating insert 4 and the movable mold pad 2 have a surface contact and a tight fit and are locked and fixed by bolts, the positioning rod 6 and the movable mold insert 3 have a surface contact and a tight fit, the positioning rod 6 and the movable mold insert 9 and the movable plate 1 have a clearance fit, the ejector rod 10 and the movable mold insert 3 have a surface contact and a sliding fit, the ejector rod 10 and the movable plate 1 and the movable mold pad 2 have a clearance fit, the shoulder bolt 11 and the movable plate 1 have a surface contact and a thread connection and are fixed, the shoulder bolt 11 and the movable mold pad 2 have a clearance fit, the spring 12 and the movable plate 1 and the movable mold pad 2 have a clearance fit, the spring 12 and the shoulder bolt 11 have a clearance fit; the fitting clearance between the central insert 5 and the floating insert 4 is 0.01-0.025mm, the fitting clearance between the positioning rod 6 and the central insert 5 is 0.01-0.02mm, a first distance is set between the hanging platform set on the shoulder bolt 11 and the hanging platform countersunk hole set on the movable mold pad 2, the first distance is the distance between the movable mold plate 1 and the movable mold pad 2 when the mold is opened, and the first distance is the floating distance of the floating insert 4. .

[0006] The beneficial effects of the present invention are as follows: the mold provided with a layered floating mechanism utilizes the mold opening force and the tension of the spring 12 to promote the separation of the movable mold plate 1 and the movable mold pad 2, utilizes the linear motion of the movable mold pad 2 to drive the floating insert 4 to realize partial demolding of the plastic product, reduces the clamping force of the molded product during the ejection process, utilizes the supporting and limiting effect of the positioning rod 6 on the center insert 5, realizes that the center insert 5 maintains its original state during the movement of the floating insert 4, and prevents the injection molded product from being strained. The mechanism effectively utilizes the mold space, simplifies the mold structure, ensures a smooth ejection process of the plastic product, prevents the generation of defective products caused by the clamping force of the injection molded product, and the mold movement process is carried out smoothly, shortens the molding cycle, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The following is a detailed description of the embodiments with reference to the accompanying drawings.

[0008] Figure 1 This is a schematic diagram of the assembly of a mold with a layered floating mechanism. Figure 1 .

[0009] Figure 2 This is a schematic diagram of the assembly of a mold with a layered floating mechanism. Figure 2 .

[0010] Figure 3 This is a cross-sectional diagram of a mold with a layered floating mechanism. Figure 3 .

[0011] Figure 4 Schematic diagram of the components of a mold with a layered floating mechanism Figure 4 .

[0012] In the figure: 1 movable mold plate; 2 movable mold pad; 3 movable mold insert; 4 floating insert; 5 center insert; 6 positioning rod; 7 positioning screw sleeve; 8 screw plug; 9 movable mold insert; 10 ejector rod; 11 shoulder bolt; 12 spring. DETAILED DESCRIPTION

[0013] The specific embodiments of the invention are described in detail below with reference to technical texts and drawings.

[0014] The implementation of the invention is applied to mold assembly. During assembly, the movable mold insert 9 is mounted in the mold cavity processed by the movable mold insert 3 and limited by the hanging platform. The movable mold insert 3 is mounted in the mold cavity processed by the movable mold plate 1. The bolts pass through the movable mold plate 1 to lock and fix the movable mold insert 3. The center insert 5 is mounted in the countersunk hole processed by the floating insert 4. The oblong hole provided on the floating insert 4 is aligned with the through hole provided on the center insert 5. The center insert 5 and the floating insert 4 are mounted on the movable mold pad 2 as a whole. The bolts pass through the movable mold pad 2 to lock and fix the floating insert 4 (see Figure 1 ), the spring 12 is installed in the cavity processed by the movable mold plate 2, and the movable mold plate 1 and the movable mold plate 2 are connected by guide pins and guide sleeves (see Figure 2 ), the head of the floating insert 4 is fitted with the through hole processed on the movable mold insert 3, the positioning rod 6 is fitted in the through hole processed by the positioning screw sleeve 7, and is limited by the hanging table, and the screw plug 8 is fitted in the internal thread cavity processed by the positioning screw sleeve 7 and limits the positioning rod 6 (see Figure 4 ), the positioning rod 6, the positioning screw sleeve 7 and the screw plug 8 are assembled as a whole in the mold cavity processed by the movable template 1, the positioning rod 6 passes through the through hole processed by the movable template 1 and is assembled with the positioning hole processed by the movable mold insert 3, the positioning rod 6 is matched with the through hole clearance on the movable mold insert 9 and the floating insert 4, and is tightly matched with the positioning hole processed on the center insert 5 (see Figure 1 and Figure 3 ), the shoulder bolt 11 passes through the movable mold plate 2 and the spring 12 and is threadedly connected to the movable mold plate 1 and locked (see Figure 2 ).

[0015] The mold opening and ejection process of the layered floating mechanism is implemented as follows: after the plastic product is injected, the mold is opened. Under the action of the mold opening force and the spring 12, the movable mold plate 1 and the movable mold pad 2 are separated first, and the floating insert 4 fixed on the movable mold pad 2 moves linearly with the movable mold pad 2. Under the support of the positioning rod 6, the center insert 5 overcomes the friction with the floating insert 4 and keeps the original position unchanged. The linear movement of the floating insert 4 realizes the demoulding of the annular position product of the plastic product. Since the first demoulding of the annular position product of the plastic product reduces the clamping force of the plastic product on the movable mold forming part, after the fixed mold part and the movable mold part are completely separated, the ejector rod 10 ejects the plastic product out of the mold cavity under the action of the ejection column. During the injection molding process, the gas in the cavity is discharged through the exhaust hole set on the center insert 5 to ensure the surface quality of the injection molded product and prevent the generation of bubble defects inside the product.

[0016] The above is a superior implementation mode of the present invention. It should be pointed out that for technicians in the technical field to which the present invention belongs, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A mold with a layered floating mechanism, characterized in that The structure comprises: a movable die plate (1), a movable die backing plate (2), a movable die insert (3), a floating insert (4), a center insert (5), a positioning rod (6), a positioning screw sleeve (7), a screw plug (8), a movable die insert (9), a push rod (10), a shoulder bolt (11) and a spring (12);The connection relationship is as follows: the movable die plate (1) and the movable die pad (2) are in surface contact and connected by guide pins and guide sleeves; the movable die insert (3) is in surface contact and tightly matched with the movable die plate (1) and is locked and fixed by bolts; the positioning screw sleeve (7) is provided with an external thread, an external hanging platform, a hanging platform countersunk hole and an internal thread; the positioning rod (6) is provided with a chamfer and a hanging platform; the central insert (5) is provided with a positioning hole, an oil groove and an exhaust hole; the external thread provided on the positioning screw sleeve (7) is threadedly connected and fixed with the movable die plate (1); the external hanging platform provided on the positioning screw sleeve (7) is in surface contact and limited with the movable die plate (1); the hanging platform provided on the positioning rod (6) is in surface contact and limited with the hanging platform countersunk hole provided on the positioning screw sleeve (7); the screw plug (8) is threadedly connected and fixed with the internal thread surface provided on the positioning screw sleeve (7), the positioning rod (6) is in surface contact with the screw plug (8) and is limited, the chamfer provided on the positioning rod (6) plays a role of guiding in the assembly process, the central insert (5) is cylindrical in shape, the floating insert (4) is cylindrical in shape, the floating insert (4) is provided with an oblong hole, a countersunk hole, a through hole, a threaded hole, an oil groove and an external hanging platform, the outer surface of the central insert (5) is in contact and sliding cooperation with the countersunk hole surface provided on the floating insert (4), the oil grooves provided on the central insert (5) are distributed on the outer surface of the central insert (5), and play a role of lubrication in the relative sliding of the central insert (5) and the floating insert (4). The exhaust hole provided on the central insert (5) is connected with the positioning hole, the exhaust hole provided on the central insert (5) is connected with the through hole provided on the floating insert (4), and the through hole provided on the floating insert (4) is connected with the threaded hole, so as to ensure that the gas in the mold cavity is discharged in time during the molding process to ensure the quality of the plastic product. The positioning hole provided on the central insert (5) is in surface contact with the positioning rod (6) and is closely matched. The oblong hole provided on the floating insert (4) is in clearance with the positioning rod (6). The distance between the two centers of the oblong hole is greater than the floating distance of the floating insert (4). The external hanging platform provided on the floating insert (4) is in surface contact with the movable mold plate (1), and the floating insert (4) is in surface contact with the movable mold insert (3). Contact sliding fit, the oil groove provided on the floating insert (4) plays a role of lubrication during the floating process, the floating insert (4) and the movable mold plate (1) have a clearance fit, the floating insert (4) and the movable mold pad (2) have a surface contact and tight fit and are locked and fixed by bolts, the positioning rod (6) and the movable mold insert (3) have a surface contact and tight fit, the positioning rod (6) and the movable mold insert (9) and the movable mold plate (1) have a clearance fit respectively, the shoulder bolt (11) and the movable mold plate (1) are threadedly connected and fixed by surface contact, the shoulder bolt (11) and the movable mold pad (2) have a clearance fit, the spring (12) and the movable mold plate (1) and the movable mold pad (2) have a clearance fit respectively, and the spring (12) and the shoulder bolt (11) have a clearance fit;The matching clearance between the central insert (5) and the floating insert (4) is 0.01-0.025 mm, the matching clearance between the positioning rod (6) and the central insert (5) is 0.01-0.02 mm, and a first distance is provided between the hanging platform provided on the shoulder bolt (11) and the hanging platform countersunk hole provided on the movable mold pad (2), the first distance being the distance that the movable mold plate (1) and the movable mold pad (2) are separated in the mold opening state, and the first distance being the floating distance of the floating insert (4). ;

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