Die provided with roller rotating mechanism
The design of the roller rotary mechanism solves the demolding problem of helical gear products in high-temperature molds, achieving stable demolding and efficient mold operation, avoiding jamming, and improving product accuracy and production efficiency.
Patent Information
- Application Number
- CN202520325640.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-27
AI Technical Summary
In the existing technology, helical gear molds are prone to jamming during high-temperature molding, and the ball bearings are prone to wear and detachment, affecting product accuracy and mold life.
The roller rotary mechanism, through the cooperation of guide core, double-layer rollers, moving mold insert and ejector pin assembly, enables precise rotary demolding of helical gear products. It uses rolling friction instead of sliding friction to reduce friction and adapt to the thermal expansion and contraction of high-temperature molds.
It enables stable demolding of helical tooth products in high-temperature molds, prevents tearing, reduces product defect rate, improves production efficiency, simplifies mold structure and saves costs.
Smart Images
Figure CN223763671U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of thermoplastic molding dies, and relates to a mold with a roller rotary mechanism. It is mainly used in molding dies for plastic products with helical teeth, especially in molding dies for plastic products with helical teeth that require high mold temperatures. Background Technology
[0002] Plastic helical gears offer numerous advantages, including improved transmission accuracy and reliability, reduced noise and vibration, enhanced load-bearing capacity, improved transmission smoothness and durability, ensured smooth and precise operation, reduced wear, and extended lifespan. They are widely used in the automotive, aerospace, medical device, and industrial equipment industries. Existing technology CN214082599U, concerning a gear injection molding device, was filed on December 29, 2020. It discloses the technical features of 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; the upper end of the helical gear mold is provided with a guide groove, and the limiting mechanism includes a positioning rod that cooperates 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 is known that this technology uses a bearing assembly to achieve rotational demolding for gear mold forming. The bearing contains balls, which are prone to wear and detachment during long-term injection molding production. This not only affects the precision of the product but also damages 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. High-temperature molds are often required during the injection molding process to ensure the process and requirements. Traditional rotary demolding mechanisms often experience jamming during production and cannot smoothly achieve high-temperature mold injection molding. Summary of the Invention
[0003] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.
[0004] The technical problem this invention aims to solve is to provide a mold equipped with a roller rotation mechanism, which addresses the issues encountered in high-temperature mold forming of plastic products with helical teeth, particularly applicable to precision plastic products with large surface areas, large helical tooth angles, and dense arrangement. To achieve the above objective, this invention relies on the coordinated use of a guide core, double-layer rollers, a moving mold insert, and an ejector pin assembly to achieve precise rotational demolding of plastic products with helical teeth, preventing damage to the helical teeth, ensuring the accuracy of the helical tooth portion of the plastic product, and meeting technical and usage requirements.
[0005] The technical solution of this utility model is as follows: A mold equipped with a roller rotary mechanism comprises a fixed mold part and a moving mold part. The structure and connection relationship are as follows: a floating guide mechanism is formed by a fixed mold insert 5, a guide core 6, and a spring 20, and is fixed to the fixed mold plate 1, belonging to the fixed mold part; a roller rotary mechanism is formed by a moving mold insert 7, moving mold insert A8, moving mold insert B9, moving mold insert C10, moving mold insert D11, moving mold insert E12, an outer ring insert 13, an outer roller assembly 14, an inner ring insert 15, an inner roller assembly 16, a limiting insert 17, a limiting pin 18, and an ejector rod assembly 19, and is formed by the roller rotary mechanism. The roller rotary mechanism, along with the moving mold plate 2, the moving mold base plate 3, and the face pin plate 4, belongs to the moving mold part. The floating guide mechanism and the roller rotary mechanism are used in combination to achieve helical gears. Product 21 is demolded in the mold; the fixed mold insert 5 is in close contact with the fixed mold plate 1 and is locked and fixed by bolts; the guide core 6 is in sliding contact 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 countersunk hole; in the mold closed state, there is a gap between the hanging platform on the guide core 6 and the countersunk hole on the fixed mold insert 5; the spring 20 is in clearance contact with the fixed mold insert 5; the spring 20 is in contact with the guide core 6; the moving mold insert A8 is provided with a helical tooth forming surface, a positioning surface and a conical inclined surface; the moving mold insert A8 is in surface contact with the moving mold insert C10 and is locked and fixed by a positioning surface limiting bolt; the moving mold insert A8 and the moving mold insert B9 are in sliding contact with each other; the moving mold insert B9 is provided with a forming surface and a positioning platform. Moving mold insert B9 and moving mold insert D11 are in surface contact, positioned by a positioning table and locked with bolts. Moving mold insert E12 is provided with a fixing table, and moving mold insert E12 is in surface contact with moving mold base plate 3, positioned by the fixing table and locked with bolts. The outer ring insert 13 has through slots, the number of which is the same as the number of outer rollers in the outer roller assembly 14. The width of the outer ring insert 13 is the same as the diameter of the outer rollers. The outer roller assembly 14 and the outer ring insert 13 are in surface contact and rolling fit. The inner ring insert 15 has through slots, the number of which is the same as the number of inner rollers in the inner roller assembly 16. The width of the inner ring insert 15 is the same as the diameter of the inner rollers. The inner roller assembly 16 and the inner ring insert 15 are in surface contact and rolling fit. The bottom of the moving mold insert C10 is provided with a recessed platform, limiting… The positioning insert 17 is in close contact with the moving mold insert D11 and is limited by the mounting platform. In the closed mold state, the positioning insert 17 and the recessed platform at the bottom of the moving mold insert C10 have a gap. In the open mold state, the positioning insert 17 contacts and is limited by the recessed platform at the bottom of the moving mold insert C10. The moving mold insert A8 limits the moving mold insert B9, the moving mold insert A8 limits the inner ring insert 15, the moving mold insert 7 limits the outer ring insert 13, and the moving mold insert C10 limits the moving mold insert D11. The ejector pin assembly 19 is in sliding contact with the moving mold inserts B9 and D11, and is in clearance contact with the moving mold plate 2 and the moving mold base plate 3. The ejector pin assembly 19 is in clearance contact with the face pin plate 4 and is limited by the mounting platform. After injection molding, the ejector pin assembly 19 contacts the helical tooth product 21.
[0006] The distance between the bottom surface of the mounting platform on the guide core 6 and the bottom surface of the countersunk hole 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 tapered inclined surface on the moving mold insert A8 and promotes the rotation and reset of the moving mold insert A8. 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 of the guide core 6 and the tapered inclined surface on the moving mold insert A8 are wedge-fitted together.
[0007] The moving mold insert A8 is provided with a pin hole, and the moving mold insert A8 and the moving mold insert C10 are limited and prevented from misalignment by a limiting pin 18; the opening of the tapered slope provided on the moving mold insert A8 is provided with a transition angle, and when the mold is closed, the head cone of the guide core 6 is located in the area of the tapered slope provided on A8.
[0008] The minimum ejection distance of the ejector pin assembly 19 is the ejection distance required for the helical teeth on the helical tooth product 21 to fully rotate and demold. The maximum ejection distance of the ejector pin assembly 19 is the ejection distance required when the moving mold insert C10 rotates and contacts and is limited by the limiting insert 17.
[0009] The beneficial effects of this utility model are as follows: The mold equipped with a roller rotary mechanism utilizes the thrust applied to the helical gear product 21 by the ejector pin assembly 19 during mold opening, enabling the helical gear product 21 to rotate under the action of the helical gears, promoting the rotation of the moving mold insert C10. The rolling of the outer roller assembly 14 and the inner roller assembly 16 facilitates the demolding of the helical gear product 21. In the high-temperature mold, the contact area between the outer roller assembly 14 and the inner roller assembly 16 and the moving mold insert C10 is linear, realizing the transformation of sliding friction into rolling friction, reducing frictional force. The uniform distribution of the outer and inner rollers enhances the stability of the roller rotary mechanism, enabling it to adapt to the thermal expansion and contraction of the high-temperature mold and ensuring stable mold operation. This design avoids jamming and overcomes the vulnerability of traditional bearing molds. The limiting insert 17 restricts the moving mold insert C10, ensuring both successful demolding of the helical gear product 21 and preventing the moving mold insert C10 from exceeding the return stroke of the guide core 6. The tension of the spring 20 provides cushioning, preventing the guide core 6 from breaking. This solves the problems existing in helical gear product molding molds, achieving precise mold rotation for demolding and resetting, simplifying the mold structure, saving mold costs and space, ensuring smooth product demolding and meeting technical and usage requirements, preventing helical gear product damage, reducing product defect rates, and improving production efficiency. Attached Figure Description
[0010] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments.
[0011] Figure 1This is an assembly diagram of a mold equipped with a roller rotary mechanism.
[0012] Figure 2 This is a schematic diagram of the moving mold assembly connection for a mold equipped with a roller rotary mechanism. Figure 1 .
[0013] Figure 3 This is a schematic diagram of the moving mold assembly connection for a mold equipped with a roller rotary mechanism. Figure 2 .
[0014] Figure 4 This is a schematic diagram of the moving mold assembly connection for a mold equipped with a roller rotary mechanism. Figure 3 .
[0015] Figure 5 This is a schematic diagram of the moving mold assembly connection for a mold equipped with a roller rotary mechanism. Figure 4 .
[0016] In the diagram: 1 Fixed mold plate; 2 Moving mold plate; 3 Moving mold base plate; 4 Face pin plate; 5 Fixed mold insert; 6 Guide core; 7 Moving mold insert; 8 Moving mold insert A; 9 Moving mold insert B; 10 Moving mold insert C; 11 Moving mold insert D; 12 Moving mold insert E; 13 Outer ring insert; 14 Outer roller assembly; 15 Inner ring insert; 16 Inner roller assembly; 17 Limiting insert; 18 Limiting pin; 19 Ejector rod assembly; 20 Spring; 21 Helical tooth product. Detailed Implementation
[0017] The specific embodiments of the utility model are described in detail below with reference to the technical text and accompanying drawings.
[0018] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.
[0019] like Figures 1-5As shown, this utility model provides a mold with a roller rotation mechanism. A spring 20 is fitted into the cavity machined in the fixed mold plate 1, and a guide core 6 is fitted into the cavity machined in the fixed mold insert 5. The guide core 6 and the fixed mold insert 5 are fitted as a whole into the cavity machined in the fixed mold plate 1, and bolts pass through the fixed mold insert 5 to lock and fix it. A limiting pin 18 is fitted into a pin hole machined in the moving mold insert C10, and the moving mold insert A8 is fitted into the cavity machined in the moving mold insert C10, limited by the limiting pin 18. Bolts pass through the moving mold insert. A8 is locked and fixed to the moving mold insert C10. The moving mold insert B9 is fitted into the cavity machined by the moving mold insert D11. Bolts pass through the moving mold insert D11 and lock and fix it to the moving mold insert B9. The moving mold insert E12 is fitted into the cavity machined on the moving mold base plate 3. Bolts pass through the moving mold base plate 3 and lock and fix the moving mold insert E12. The limiting insert 17 is fitted into the cavity machined on the moving mold insert D11. The limiting insert 17 and the moving mold insert D11 are fitted as a whole into the cavity machined by the moving mold plate 2. Bolts pass through the moving mold plate 2 and lock and fix it to the cavity machined by the moving mold plate 2. Plate 2 locks and fixes the moving mold insert D11. The moving mold base plate 3 is fitted with the moving mold plate 2. The moving mold insert E12 is fitted into the machined cavity of the moving mold insert D11. The outer roller assembly 14 and the inner roller assembly 16 are coated with lubricating oil. The inner ring insert 15 is fitted into the machined groove of the inner roller assembly 16 and is fitted as a whole on the outer circle of the moving mold insert D11. The outer roller assembly 14 is fitted into the machined groove of the outer ring insert 13 and is fitted as a whole on the outer circle of the moving mold insert C10. The moving mold insert A8, the moving mold insert C10, and the outer roller assembly 1... 4 and the outer ring insert 13 are assembled together with the moving mold insert D11. The moving mold insert A8 is in surface contact with and limits the inner roller assembly 16. The moving mold insert 7 is installed in the cavity machined in the moving template 2. The moving mold insert 7 is in surface contact with and limits the outer ring insert 13. The bolt passes through the moving mold insert 7 and locks it in place. The ejector rod assembly 19 is installed in the cavity machined in the face pin plate 4. The ejector rod assembly 19 passes through the machined ejector rod hole and slides with the moving mold insert B9. The fixed template 1 is assembled with the moving template 2. The guide core 6 and the moving mold insert A8 are wedge-fitted together.
[0020] In use, when the mold equipped with the roller rotary mechanism opens, the ejector assembly 19 performs an ejection movement under the action of the molding machine. The ejector assembly 19 contacts the surface of the helical tooth product 21 and pushes the helical tooth product 21. The helical tooth surface on the helical tooth product 21 is subjected to a vertical thrust and begins to rotate. The forming part of the helical tooth product 21 is on the moving mold insert A8. The moving mold insert A8 and the moving mold insert C10 rotate together with the helical tooth product 21 as a whole. The rolling of the outer roller assembly 14 and the inner roller assembly 16 reduces the friction force when the moving mold insert C10 rotates, adapts to the thermal expansion and contraction of the high-temperature mold, prevents the rotating mechanism from jamming in the high-temperature mold, and realizes the demolding of the helical tooth product 21. When the limiting insert 17 contacts the bottom of the moving mold insert C10, the moving mold insert C10 stops rotating, the helical tooth product 21 is separated from the cavity, and the guide core 6 pops out under the tension of the spring 20.
[0021] During mold closing, the ejector pin assembly 19 resets. Under the action of the molding machine, the fixed mold plate 1 and the moving mold plate 2 move towards each other. The head cone on the guide core 6 contacts the tapered inclined surface on the moving mold insert A8 and applies a pushing force, driving the moving mold insert A8 to rotate and reset. The spring 20 applies force to the guide core 6 to achieve a buffering effect and prevent the guide core 6 from breaking. The rolling of the outer roller assembly 14 and the inner roller assembly 16 reduces the friction force when the moving mold insert C10 resets and rotates. The limiting insert 17 separates from the bottom of the moving mold insert C10. The fixed mold plate 1 and the moving mold plate 2 come into contact to complete the mold closing process.
[0022] The above description represents the superior embodiments of this utility model. It should be noted that, for those skilled in the art to which this utility model pertains, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.
Claims
1. A mold provided with a roller swing 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) form a floating guide mechanism, 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 limiting insert (17), the limiting pin (18) and the ejector rod group (19) form a roller rotating mechanism, the roller rotating mechanism belongs to the movable mold part together with the movable mold plate (2), the movable mold base plate (3) and the face pin plate (4), the floating guide mechanism is used in combination with the roller rotating mechanism to realize the demolding of the helical tooth product (21) in the mold; the guide core (6) is in surface contact and sliding fit with the fixed mold insert (5), the guide core (6) is provided with a head taper and a hanging table, the fixed mold insert (5) is provided with a counterbore, in the clamped state, the hanging table arranged on the guide core (6) and the counterbore arranged 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 tooth forming surface, a positioning surface and a tapered inclined surface, the movable mold insert A (8) is in surface contact with the movable mold insert C (10) and is locked and fixed by the positioning surface and a limiting bolt, the movable mold insert A (8) and the movable mold insert B (9) are in surface contact and sliding fit, the movable mold insert B (9) is provided with a forming surface and a positioning table, the movable mold insert B (9) is in surface contact with the movable mold insert D (11) and is locked and fixed by the positioning table and a bolt, the movable mold insert E (12) is provided with a fixed table, the movable mold insert E (12) is in surface contact with the movable mold base plate (3) and is positioned and locked by the fixed table and a bolt; the outer ring insert (13) is provided with a through groove, the number of the through grooves is the same as that of the 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 rollers, and the outer roller group (14) is in surface contact and rolling fit with the outer ring insert (13); the inner ring insert (15) is provided with a through groove, the number of the through grooves is the same as that of the 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 rollers, and the inner roller group (16) is in surface contact and rolling fit with the inner ring insert (15); the movable mold insert C (10) is provided with a sunken table at the bottom, the limiting insert (17) is in surface contact and close fit with the movable mold insert D (11) and is positioned by the hanging table, in the closed mold state, the limiting insert (17) and the sunken table arranged at the bottom of the movable mold insert C (10) are provided with a gap, in the opened mold state, the limiting insert (17) is in surface contact with the sunken table arranged at the bottom of the movable mold insert C (10) and is positioned; the movable mold insert A (8) positions the movable mold insert B (9), the movable mold insert A (8) positions the inner ring insert (15), the movable mold insert (7) positions the outer ring insert (13), and the movable mold insert C (10) positions the movable mold insert D (11).The ejector rod group (19) is in surface contact sliding fit with the movable mold insert B (9) and the movable mold insert D (11), and after injection molding, the ejector rod group (19) is in surface contact with the bevel gear product (21).
2. The mold provided with a roller swivel mechanism according to claim 1, characterized in that: The distance between the bottom surface of the hanging table arranged on the guide core (6) and the bottom surface of the hanging table counterbore arranged on the fixed die 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, the head taper of the guide core (6) contacts the tapered inclined surface arranged on the movable die insert A (8) and promotes the rotation of the movable die insert A (8) during the mold closing process, the spring (20) applies a pushing force to the guide core (6), which can play a buffering role during the mold closing process, and the head taper arranged on the guide core (6) is in wedge tight fit with the tapered inclined surface arranged on the movable die insert A (8) in the mold closing state.
3. The mold provided with a roller swivel mechanism according to claim 1, characterized in that: The movable die insert A (8) is provided with a pin hole, and the movable die insert A (8) and the movable die insert C (10) are limited and prevented from being wrong by the limiting pin (18); the opening part of the tapered inclined surface arranged on the movable die insert A (8) is provided with an excess angle, and the head taper arranged on the guide core (6) is arranged in the tapered inclined surface region arranged on the A (8) during the mold closing.
4. The mold provided with a roller swivel mechanism according to claim 1, characterized by: The minimum value of the ejection distance of the ejector rod group (19) is the ejection distance required for the helical tooth product (21) to be completely rotated and demolded, and the maximum value of the ejection distance of the ejector rod group (19) is the ejection distance required when the movable die insert C (10) contacts and is limited by the limiting insert (17) after being rotated.