Die provided with roller rotating mechanism

Abstract

A mold with a roller rotating mechanism belongs to the field of thermoplastic plastic forming molds, and realizes conversion of sliding friction of a movable mold insert into rolling friction, reduction of friction force, uniform distribution of the double-layer rollers and enhancement of stability of the roller rotating mechanism by means of cooperative use of a guide core, double-layer rollers, the movable mold insert and an ejector rod group. The guide core can adapt to expansion caused by heat and contraction caused by cold of a high-temperature mold, stable operation of the mold is guaranteed, the clamping stagnation phenomenon is avoided, buffering is achieved through the spring, the guide core is prevented from being broken, the problems existing in a helical tooth product forming mold, especially the problems existing in a helical tooth product high-temperature mold are solved, accurate rotary demolding and resetting of the mold are achieved, and the production efficiency is improved. The mold structure is simplified, the mold cost is saved, the mold space is saved, the product meets the technical requirement and the use requirement, the product is prevented from being pulled, the product reject ratio is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of thermoplastic plastic molding dies, and relates to a mold provided with a roller rotating mechanism, and is mainly applied to a molding mold of a plastic product provided with helical teeth, and is particularly applied to a molding mold of a plastic product provided with helical teeth which requires a high mold temperature. Background Art

[0002] Plastic helical gears have many advantages, which can improve transmission accuracy and reliability, reduce noise and vibration, enhance load-bearing capacity, improve transmission stability and durability, ensure smooth and precise operation, reduce wear and extend service life, and are widely used in the automotive industry, aerospace, medical equipment, industrial equipment and other fields. Existing public technology CN214082599U, which involves a gear injection molding device, was filed on December 29, 2020. Its content discloses the technical features involved in a gear injection molding device, wherein the mold includes a helical gear forming mold and a bearing installed between the helical gear mold and a fixing mechanism; a guide groove is provided at the upper end of the helical gear mold, and the limiting mechanism includes a positioning rod used in conjunction with the guide groove; one end of the positioning rod is connected to the guide groove, and the other end is fixedly installed on the fixing mechanism. It can be seen that this technology uses a bearing assembly to achieve rotary demolding to realize gear mold molding. Balls are arranged in the bearings, which are easy to wear and the rollers are easy to fall off during long-term injection molding production, which not only affects the precision of the product, but also causes damage to the mold. In recent years, in order to improve the performance of plastic helical gears, plastic materials with strong wear resistance and corrosion resistance are often used. In the process of injection molding, high-temperature molds are often required to ensure their process and requirements. Traditional rotary demolding mechanisms often get stuck during the production process and cannot smoothly realize injection molding of high-temperature molds. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0004] The technical problem to be solved by the present invention is to provide a mold with a roller rotary mechanism, which solves the problems existing in high-temperature mold molding of plastic products with helical teeth, and is particularly applicable to precision plastic products with large surface area, large helical tooth angles and dense settings. To achieve the above purpose, the present invention relies on the coordinated use of a guide core, a double-layer roller, a movable mold insert and a push rod group to achieve precise rotary demoulding of the mold of a plastic product with helical teeth, prevent the helical teeth from being damaged, ensure the accuracy of the helical tooth portion of the plastic product and meet the technical requirements and usage requirements.

[0005] The technical solution of the present invention is: the structure of the mold provided with a roller rotating mechanism includes: a fixed mold part and a movable mold part, and its structure and connection relationship are as follows: the fixed mold insert 5, the guide core 6 and the spring 20 constitute a floating guide mechanism, and the floating guide mechanism is fixed to the fixed mold plate 1 and belongs to the fixed mold part; the movable mold insert 7, the movable mold insert A8, the movable mold insert B9, the movable mold insert C10, the movable mold insert D11, the movable mold insert E12, the outer ring insert 13, the outer roller group 14, the inner ring insert 15, the inner roller group 16, the limit insert 17, the limit pin 18 and the ejector rod group 19 constitute a roller rotating mechanism, and the roller rotating mechanism and the movable mold plate 2, the movable mold bottom plate 3, and the face needle plate 4 belong to the movable mold part, and the floating guide mechanism and the roller rotating mechanism are used in combination to realize the production of helical gears. The product 21 is demoulded in the mold; the fixed mold insert 5 is in surface contact and tightly matched with the fixed mold plate 1 and is locked and fixed by bolts, the guide core 6 is in surface contact and sliding match with the fixed mold insert 5, the guide core 6 is provided with a head cone and a hanging platform, the fixed mold insert 5 is provided with a countersink, in the mold closing state, the hanging platform provided on the guide core 6 and the countersink provided on the fixed mold insert 5 are provided with a gap, the spring 20 is in gap match with the fixed mold insert 5, and the spring 20 is in surface contact with the guide core 6; the movable mold insert A8 is provided with a beveled forming surface, a positioning surface and a conical inclined surface, the movable mold insert A8 is in surface contact with the movable mold insert C10 and is locked and fixed by the positioning surface limit bolts, the movable mold insert A8 is in surface contact and sliding match with the movable mold insert B9, and the movable mold insert B9 is provided with a forming surface and a positioning platform, The movable mold insert B9 is in surface contact with the movable mold insert D11, which is positioned by the positioning table and fixed by bolts. The movable mold insert E12 is provided with a fixed table. The movable mold insert E12 is in surface contact with the movable mold bottom plate 3, which is positioned by the fixed table and fixed by bolts. The outer ring insert 13 is provided with through grooves, the number of which is the same as the number of outer rollers in the outer roller group 14, the width of the outer ring insert 13 is the same as the diameter of the outer roller, and the outer roller group 14 is in surface contact and rolling cooperation with the outer ring insert 13; the inner ring insert 15 is provided with through grooves, the number of which is the same as the number of inner rollers in the inner roller group 16, the width of the inner ring insert 15 is the same as the diameter of the inner roller, and the inner roller group 16 is in surface contact and rolling cooperation with the inner ring insert 15; the bottom of the movable mold insert C10 is provided with a sinking platform to limit The positioning insert 17 is in surface contact and tightly matched with the movable mold insert D11 and is limited by the hanging table. In the closed mold state, a gap is provided between the limiting insert 17 and the sinking table set at the bottom of the movable mold insert C10. In the open mold state, the limiting insert 17 is in surface contact and limited with the sinking table set at the bottom of the movable mold insert C10; the movable mold insert A8 limits the movable mold insert B9, the movable mold insert A8 limits the inner ring insert 15, the movable mold insert 7 limits the outer ring insert 13, and the movable mold insert C10 limits the movable mold insert D11; the ejector pin group 19 is in surface contact and sliding match with the movable mold insert B9 and the movable mold insert D11, the ejector pin group 19 is in clearance match with the movable mold plate 2 and the movable mold bottom plate 3, the ejector pin group 19 is in clearance match with the face needle plate 4 and is limited by the hanging table, and after injection molding, the ejector pin group 19 is in surface contact with the helical gear product 21.

[0006] The distance between the bottom surface of the hanging platform arranged on the guide core 6 and the bottom surface of the hanging platform countersunk hole arranged on the fixed mold insert 5 is the pop-up distance of the guide core 6 in the mold opening state. The guide core 6 is in the pop-up state in the mold opening state. During the mold closing process, the head frustum of the guide core 6 contacts the conical inclined surface arranged on the movable mold insert A8 and promotes the rotation and reset of the movable mold insert A8. The thrust applied to the guide core 6 by the spring 20 can play a buffering role in the mold closing process. In the mold closing state, the head frustum arranged on the guide core 6 is wedge-tightly matched with the conical inclined surface arranged on the movable mold insert A8.

[0007] The movable mold insert A8 is provided with a pin hole, and the movable mold insert A8 and the movable mold insert C10 are limited and prevented from error by a pin 18; the opening portion of the conical slope provided on the movable mold insert A8 is provided with a transition angle, and the head cone provided on the guide core 6 is within the conical slope area provided on A8 when the mold is closed.

[0008] The minimum ejection distance of the ejector pin group 19 is the ejection distance required for the helical teeth set on the helical gear product 21 to be completely rotated and demolded, and the maximum ejection distance of the ejector pin group 19 is the ejection distance required when the movable mold insert C10 rotates and contacts and limits the position with the limiting insert 17.

[0009] The beneficial effects of the present invention are as follows: the mold utilizes the thrust applied to the helical gear product 21 by the ejector group 19 when the mold is opened, so that the helical gear product 21 rotates under the action of the helical gear, and utilizes the rolling of the outer roller group 14 and the inner roller group 16 to realize demoulding of the helical gear product 21. In the high-temperature mold, the contact area between the outer roller group 14 and the inner roller group 16 and the movable mold insert C10 is a line, so that the sliding friction is converted into rolling friction, and the friction force is reduced. The outer rollers and the inner rollers are evenly distributed, and the stability of the roller rotating mechanism is enhanced. It can adapt to the thermal expansion and contraction of the high-temperature mold, ensure the stable operation of the mold, and avoid the occurrence of the jamming phenomenon. The defect of the traditional bearing molds being easy to damage is overcome; the limit insert 17 is used to limit the movable mold insert C10, so that the demoulding of the helical gear product 21 is satisfied, and the movable mold insert C10 is prevented from exceeding the reset stroke of the guide core 6; the tension of the spring 20 is used to achieve buffering to prevent the guide core 6 from breaking, thereby solving the problems existing in the molding mold of the helical gear product, realizing accurate rotary demoulding and reset of the mold, simplifying the mold structure, saving mold cost, saving mold space, making the product demould smoothly and meeting the technical requirements and use requirements, preventing the helical gear product from being strained, reducing the product defective rate, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following is a detailed description of the embodiments with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the assembly of a mold with a roller rotating mechanism.

[0012] Figure 2 This is a schematic diagram of the connection of the movable mold assembly of the mold with a roller rotation mechanism Figure 1 .

[0013] Figure 3 This is a schematic diagram of the connection of the movable mold assembly of the mold with a roller rotation mechanism Figure 2 .

[0014] Figure 4 This is a schematic diagram of the connection of the movable mold assembly of the mold with a roller rotation mechanism Figure 3 .

[0015] Figure 5 This is a schematic diagram of the connection of the movable mold assembly of the mold with a roller rotation mechanism Figure 4 .

[0016] In the figure: 1 fixed mold plate; 2 movable mold plate; 3 movable mold bottom plate; 4 face needle plate; 5 fixed mold insert; 6 guide core; 7 movable mold insert; 8 movable mold insert A; 9 movable mold insert B; 10 movable mold insert C; 11 movable mold insert D; 12 movable mold insert E; 13 outer ring insert; 14 outer roller group; 15 inner ring insert; 16 inner roller group; 17 limit insert; 18 limit pin; 19 ejector rod group; 20 spring; 21 helical gear product. DETAILED DESCRIPTION

[0017] The specific embodiments of the invention are described in detail below with reference to technical texts and drawings.

[0018] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0019] like Figures 1 to 5As shown, the present invention provides a mold with a roller rotary mechanism, the spring 20 is mounted in the mold cavity processed by the fixed mold plate 1, the guide core 6 is mounted in the mold cavity processed by the fixed mold insert 5, the guide core 6 and the fixed mold insert 5 are mounted in the mold cavity processed by the fixed mold plate 1 as a whole, and the bolt passes through the fixed mold insert 5 to lock and fix it; the pin 18 is mounted in the pin hole processed on the movable mold insert C10, the movable mold insert A8 is mounted in the mold cavity processed on the movable mold insert C10, and is limited by the pin 18, and the bolt passes through the movable mold insert A8 to lock and fix it. It is locked and fixed with the movable mold insert C10, the movable mold insert B9 is installed in the mold cavity processed by the movable mold insert D11, and the bolt passes through the movable mold insert D11 to lock it with the movable mold insert B9, the movable mold insert E12 is installed in the mold cavity processed on the movable mold base plate 3, and the bolt passes through the movable mold base plate 3 to lock and fix the movable mold insert E12, the limit insert 17 is installed in the mold cavity processed on the movable mold insert D11, and the limit insert 17 and the movable mold insert D11 are installed as a whole in the mold cavity processed by the movable mold plate 2, and the bolt passes through the movable mold plate 2 The movable mold insert D11 is locked and fixed, the movable mold base plate 3 is assembled with the movable mold plate 2, the movable mold insert E12 is assembled in the through cavity of the movable mold insert D11, the outer roller group 14 and the inner roller group 16 are coated with lubricating oil, the inner ring insert 15 is assembled in the through groove of the inner roller group 16 and assembled as a whole on the outer circle of the movable mold insert D11, the outer roller group 14 is assembled in the through groove of the outer ring insert 13 and assembled as a whole on the outer circle of the movable mold insert C10, the movable mold insert A8, the movable mold insert C10, the outer roller group 14 The outer ring insert 13 is assembled with the movable mold insert D11 as a whole, the movable mold insert A8 is in surface contact with the inner roller group 16 and limits it, the movable mold insert 7 is assembled in the cavity processed by the movable mold plate 2, the movable mold insert 7 is in surface contact with the outer ring insert 13 and limits it, the bolts pass through the movable mold insert 7 to lock it, the ejector pin group 19 is assembled in the cavity processed by the face needle plate 4, the ejector pin group 19 passes through the processed ejector pin hole and slides with the movable mold insert B9, the fixed mold plate 1 is assembled with the movable mold plate 2, and the guide core 6 and the movable mold insert A8 are wedge-tightly fitted.

[0020] During use, when the mold provided with the roller rotating mechanism is opened, the ejector group 19 performs ejection movement under the action of the molding machine, and the ejector group 19 contacts the surface of the helical gear product 21 and pushes the helical gear product 21. The helical gear surface on the helical gear product 21 is subjected to vertical thrust and starts to rotate. The molding part of the helical gear product 21 is on the movable mold insert A8, and the movable mold insert A8 and the movable mold insert C10 rotate with the helical gear product 21 as a whole. The rolling of the outer roller group 14 and the inner roller group 16 reduces the friction force of the movable mold insert C10 during rotation, adapts to the thermal expansion and contraction of the high-temperature mold, prevents the rotation mechanism from getting stuck in the high-temperature mold, and realizes the demoulding of the helical gear product 21. When the limit insert 17 contacts the sink at the bottom of the movable mold insert C10, the movable mold insert C10 stops rotating, the helical gear product 21 is separated from the cavity, and the guide core 6 is ejected under the action of the tension of the spring 20.

[0021] When the mold is closed, the push rod group 19 is reset, and the fixed mold plate 1 and the movable mold plate 2 move towards each other under the action of the molding machine. The head cone set on the guide core 6 contacts and applies thrust with the conical slope set on the movable mold insert A8, driving the movable mold insert A8 to rotate and reset. The spring 20 exerts a buffering effect on the guide core 6 to prevent the guide core 6 from breaking. The rolling of the outer roller group 14 and the inner roller group 16 reduces the friction of the movable mold insert C10 when it resets and rotates. The limit insert 17 is separated from the sink at the bottom of the movable mold insert C10, and the fixed mold plate 1 and the movable mold plate 2 are in surface contact to complete the mold closing process.

[0022] 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 roller rotating mechanism, characterized in that The structure comprises: a fixed mold part and a movable mold part, and the structure and connection relationship are as follows: the fixed mold insert (5), the guide core (6) and the spring (20) constitute a floating guide mechanism, and the floating guide mechanism is fixed to the fixed mold plate (1) and belongs to the fixed mold part; the movable mold insert (7), the movable mold insert A (8), the movable mold insert B (9), the movable mold insert C (10), the movable mold insert D (11), the movable mold insert E (12), the outer ring insert (13), the outer roller group (14), the inner ring insert (15), the inner roller group (16), the limit insert (17), the limit pin (18) and the ejector rod group (19) constitute a roller rotating mechanism, and the roller rotating mechanism and the movable mold plate (2), the movable mold bottom plate (3) and the face needle plate (4) belong to the movable mold. The floating guide mechanism and the roller rotary mechanism are used in combination to realize the demoulding of the helical gear product (21) in the mold; the guide core (6) and the fixed mold insert (5) are in surface contact and sliding cooperation, the guide core (6) is provided with a head cone and a hanging platform, the fixed mold insert (5) is provided with a countersink, in the mold closing state, the hanging platform provided on the guide core (6) and the countersink provided on the fixed mold insert (5) are provided with a gap, and the spring (20) is in surface contact with the guide core (6); the movable mold insert A (8) is provided with a helical gear forming surface, a positioning surface and a conical inclined surface, the movable mold insert A (8) and the movable mold insert C (10) are in surface contact and fixed by the positioning surface limit bolt, the movable mold insert A (8) and the movable mold insert B (9) are in surface contact and sliding cooperation, and the movable mold insert A (8) and the movable mold insert B (9) are in surface contact and sliding cooperation, and the movable mold insert A (8) and the movable mold insert B (9) are in surface contact and sliding cooperation. The mold insert B (9) is provided with a molding surface and a positioning platform. The movable mold insert B (9) and the movable mold insert D (11) are in surface contact and are positioned by the positioning platform and are locked and fixed by bolts. The movable mold insert E (12) is provided with a fixing platform. The movable mold insert E (12) and the movable mold bottom plate (3) are in surface contact and are positioned by the fixing platform and are locked and fixed by bolts. The outer ring insert (13) is provided with a through groove. The number of the through grooves is the same as the number of outer rollers in the outer roller group (14). The width of the outer ring insert (13) is the same as the diameter of the outer roller. The outer roller group (14) and the outer ring insert (13) are in surface contact and rolling cooperation. The inner ring insert (15) is provided with a through groove. The number of the through grooves is the same as the number of inner rollers in the inner roller group (16). The width of the inner ring insert (15) is the same as the diameter of the outer roller. The inner roller group (16) and the inner ring insert (15) are in surface contact and rolling cooperation; a sinking platform is provided at the bottom of the movable mold insert C (10); the limiting insert (17) and the movable mold insert D (11) are in surface contact and tight cooperation and are limited by the hanging platform; in the closed mold state, a gap is provided between the limiting insert (17) and the sinking platform provided at the bottom of the movable mold insert C (10); in the open mold state, the limiting insert (17) and the sinking platform provided at the bottom of the movable mold insert C (10) are in surface contact and limited; the movable mold insert A (8) limits the movable mold insert B (9), the movable mold insert A (8) limits the inner ring insert (15), the movable mold insert block (7) limits the outer ring insert (13), and the movable mold insert C (10) limits the movable mold insert D (11);The ejector pin assembly (19) is in surface contact and sliding cooperation with the movable mold insert B (9) and the movable mold insert D (11), and after injection molding, the ejector pin assembly (19) is in surface contact with the helical gear product (21). ; 2. The mold with a roller rotating mechanism according to claim 1, characterized in that: The distance between the bottom surface of the hanging platform provided on the guide core (6) and the bottom surface of the hanging platform countersunk hole provided on the fixed mold insert (5) is the ejection distance of the guide core (6) in the mold opening state. The guide core (6) is in the ejection state in the mold opening state. During the mold closing process, the head cone of the guide core (6) contacts the conical inclined surface provided on the movable mold insert A (8) and promotes the rotation and reset of the movable mold insert A (8). The thrust applied by the spring (20) to the guide core (6) can play a buffering role during the mold closing process. In the mold closing state, the head cone provided on the guide core (6) is tightly wedge-fitted with the conical inclined surface provided on the movable mold insert A (8).

3. The mold with a roller rotating mechanism according to claim 1, characterized in that: The movable mold insert A (8) is provided with a pin hole, and the movable mold insert A (8) and the movable mold insert C (10) are limited and prevented from being misaligned by a pin (18); the opening of the conical inclined surface provided on the movable mold insert A (8) is provided with a transition angle, and the head cone provided on the guide core (6) is within the conical inclined surface area provided on A (8) when the mold is closed.

4. The mold with a roller rotating mechanism according to claim 1, characterized in that: The minimum ejection distance of the ejector pin assembly (19) is the ejection distance required for the helical teeth provided on the helical gear product (21) to be completely rotated and demoulded, and the maximum ejection distance of the ejector pin assembly (19) is the ejection distance required when the movable mold insert C (10) contacts and limits the position of the limit insert (17) after rotation.

Images