Quick replacement structure for mold insert

Abstract

The utility model discloses a quick replacement structure for a mold insert. The quick replacement structure comprises a front mold forming part and a rear mold forming part, wherein the front mold forming part consists of a front mold frame and a front mold core matched with the front mold frame; the rear mold forming part consists of a rear mold frame and a rear mold core matched with the rear mold frame; the separable combined insert consists of an upper movable insert and a lower movable insert; a positioning groove for positioning the heating tube is formed in the lower surface of the movable insert; according to the utility model, the insert is designed to be separable, so that the heating tube is positioned, an operator is prevented from being in contact with a high-temperature mold cavity when installing the heating tube, and the personal potential safety hazard is eliminated. Meanwhile, quick separation and assembly of the insert assembly and the die body can be achieved through die assembly matching of the front die frame and the rear die frame, synchronous ejection after forming is achieved through the ejector rod mechanism, the downtime of a die-casting machine table is shortened, and the production efficiency is remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a quick-change structure for mold inserts. Background Technology

[0002] In the field of die-casting heating element products, existing technologies mostly employ one-piece molds, which mainly consist of a front mold core, a front mold frame, a rear mold core, a rear mold frame, ejector pins, ejector pin fixing plates, and mold feet. In actual production, this type of one-piece mold needs to be fixed to the die-casting machine, which presents significant drawbacks. First, installing the heating element is inconvenient, and operators are easily exposed to the high-temperature mold cavity, posing a threat to their personal safety. Second, during the installation of the heating element, the die-casting machine is idle for extended periods, severely impacting production efficiency and negatively affecting product quality stability.

[0003] To overcome the shortcomings of existing integrated molds in die-casting heating tube products, this utility model provides a quick-change mold insert structure. By designing the insert as detachable, the installation of the heating tube can be completed outside the die-casting machine, effectively solving the problems of inconvenience in installing heating tubes, safety hazards, and impact on production efficiency and product quality in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a quick-change structure for mold inserts to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a quick-change structure for mold inserts, comprising:

[0006] The front mold forming part consists of the front mold frame and the front mold core that mates with it;

[0007] The rear mold forming part consists of the rear mold frame and the rear mold core that mates with it;

[0008] A separable, combined insert consisting of an upper movable insert and a lower movable insert, wherein the lower surface of the movable insert is provided with a positioning groove for positioning the heating element;

[0009] The rear mold core is provided with an assembly groove that matches the shape of the combined insert;

[0010] The anti-disengagement mechanism consists of a positioning spring and a positioning steel ball. The positioning spring is located inside the lower part of the movable insert and pushes the positioning steel ball to form a locking point on the movable insert.

[0011] The ejector mechanism includes an ejector rod that passes through the mold foot and an ejector rod fixing plate that supports the ejector rod. The top end of the ejector rod contacts the bottom of the composite insert.

[0012] Preferably, the mold structure achieves rapid separation and assembly of the insert component and the mold body through the mold-closing cooperation of the front mold frame and the rear mold frame. After the heating tube is positioned, the whole component is embedded into the mold, and the ejector mechanism realizes synchronous ejection after molding. This can avoid operators coming into contact with the high-temperature mold cavity and eliminate safety hazards. Rapid separation and assembly and synchronous ejection reduce machine downtime and improve production efficiency.

[0013] Preferably, the upper and lower movable inserts are connected by a tapered mating structure, with a 3°-5° guide taper on the contact surface. When the upper and lower movable inserts are tightened together, they can automatically center themselves, facilitating quick and accurate connection and improving the efficiency of insert assembly, thereby enhancing overall production efficiency.

[0014] Preferably, the positioning springs are arranged in a ring array within the spring cavity under the movable insert. The diameter of the positioning steel ball and the inner diameter of the spring cavity form a clearance fit of 0.02-0.05mm. The positioning springs can provide uniform thrust to the positioning steel ball, so that the positioning steel ball is stably engaged with the limiting point on the movable insert, ensuring that the heating tube will not fall off during movement.

[0015] Preferably, the limiting point is a hemispherical groove on the bottom surface of the movable insert, with a groove radius of curvature to positioning ball diameter ratio of 1:1.05-1.2. This allows for better engagement with the positioning ball and provides a stable positioning effect. The suitable radius of curvature ratio ensures that the positioning ball can smoothly engage with the groove and can also be disengaged by appropriate external force when the upper and lower parts of the movable insert need to be separated, facilitating insert replacement and meeting the need for rapid replacement.

[0016] Preferably, the lower side of the movable insert is provided with a guide rib, which forms a sliding pair with the guide groove in the rear mold core assembly groove, so that the assembled insert can be accurately embedded in the assembly groove, avoiding the normal operation of the mold due to installation deviation.

[0017] Preferably, the movable insert has an internal cooling channel with the inlet located at the top flange of the movable insert. Poor temperature control may affect product quality, and the cooling channel allows the cooling medium to circulate inside the movable insert, effectively cooling the insert.

[0018] Preferably, the push rod comprises a three-stage stepped push rod, the diameter of its top end face being 1-2mm smaller than the bottom diameter of the composite insert. This avoids product damage or insert deformation due to uneven force during ejection of the composite insert and the product, prevents excessive compression of the insert by the push rod, ensures smooth ejection process, and improves product qualification rate.

[0019] Preferably, the depth of the positioning groove is 1 / 3 to 1 / 2 of the heating element diameter, and the groove width forms an interference fit of 0.1-0.3 mm with the outer diameter of the heating element to avoid affecting the product performance due to heating element displacement. The interference fit groove width can further fix the heating element, prevent it from shaking during the die-casting process, and ensure the relative positional accuracy between the heating element and other parts of the mold.

[0020] Compared with the prior art, the technical effects and advantages of this utility model are: the mold insert quick-change structure,

[0021] This invention utilizes a detachable insert design to position the heating element, preventing operators from contacting the high-temperature mold cavity during installation and eliminating personal safety hazards. Simultaneously, the closing and assembly of the front and rear mold frames allows for rapid separation and assembly of the insert assembly from the mold body, with synchronous ejection after molding achieved by the ejector mechanism. This reduces downtime on the die-casting machine and significantly improves production efficiency.

[0022] This quick-change mold insert structure ensures product quality in several ways. The conical fit between the upper and lower movable inserts, the anti-dislodgement mechanism of the positioning spring and positioning steel ball, and the sliding pair of the guide ribs and guide grooves guarantee the accuracy and stability of insert assembly and installation. The cooling channel effectively controls the insert temperature, preventing product defects caused by temperature issues. The three-stage stepped ejector rod and the rationally designed positioning groove ensure smooth ejection and accurate heating element positioning, preventing product damage and heating element displacement, thus guaranteeing the stability and reliability of product quality. Attached Figure Description

[0023] Figure 1 This is an exploded view of the quick-change structure of the mold insert of this utility model.

[0024] In the diagram: 1. Front mold base; 2. Front mold core; 3. Upper movable insert; 4. Heating element; 5. Lower movable insert; 6. Rear mold core; 7. Rear mold base; 8. Ejector pin; 9. Ejector pin fixing plate; 10. Mold foot; 11. Positioning steel ball; 12. Positioning spring; 13. Guide rib; 14. Cooling channel. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1This utility model provides a technical solution: a quick-change structure for mold inserts, comprising:

[0027] The front mold forming part consists of the front mold base 1 and the front mold core 2 that mates with it. The front mold core 2 is tightly assembled onto the front mold base 1, and the two are reliably connected by bolts or other fastening methods. This connection method allows the front mold core 2 to stably serve as the core of the front mold forming part. During the die casting process, the forming surface of the front mold core 2 works together with the rear mold core 6 to shape the front half of the product, providing a key mold cavity for the precise forming of the product.

[0028] The rear mold forming part consists of the rear mold frame 7 and the mating rear mold core 6. The rear mold core 6 is fixed to the rear mold frame 7 in a similar manner, and the connection between the two is ensured to be stable by means of bolt tightening. The rear mold core 6 is responsible for shaping the rear half of the product. Its cooperation with the front mold core 2 completes the die casting of the entire product. The rear mold frame 7 provides stable support and mounting base for the rear mold core 6, ensuring the positional accuracy and stability of the rear mold core 6 during the die casting process.

[0029] The detachable, modular insert consists of an upper movable insert 3 and a lower movable insert 5. The lower movable insert 5 has a positioning groove on its surface for positioning the heating element 4. The upper movable insert 3 and the lower movable insert 5 are connected by a unique conical mating structure, with a guide taper on their contact surfaces. During assembly, this guide taper guides the two parts to align quickly and accurately, achieving a tight fit. This connection method improves the efficiency of insert assembly. When installing the heating element 4, the two parts can be separated outside the machine for initial operation, and then easily assembled after the heating element is installed, improving overall production efficiency. It can accurately position and firmly fix the heating element 4, preventing it from shifting during subsequent operations and die casting, thus ensuring product quality.

[0030] The rear mold core 6 is provided with an assembly groove that matches the shape of the combined insert;

[0031] The anti-detachment mechanism consists of a positioning spring 12 and a positioning steel ball 11. The positioning spring 12 is located inside the lower part 5 of the movable insert, pushing the positioning steel ball 11 to engage with the limiting point on the upper part 3 of the movable insert. The positioning steel ball 11 is placed at the end of the spring cavity near the upper part 3 of the movable insert. The elastic force of the positioning spring 12 pushes the positioning steel ball 11 to engage with the hemispherical groove on the bottom surface of the upper part 3 of the movable insert. The clearance fit between the diameter of the positioning steel ball 11 and the inner diameter of the spring cavity ensures that the positioning steel ball 11 can move flexibly within the spring cavity while preventing excessive swaying. This ensures that the positioning steel ball 11 can be stably engaged in the groove, forming a reliable anti-detachment mechanism. This prevents the heating tube 4 from falling out of the assembled insert during movement, ensuring the safety and stability of the production process.

[0032] The ejector mechanism includes an ejector rod 8 that passes through the mold base 10 and an ejector rod fixing plate 9 that supports the ejector rod 8. The top end of the ejector rod 8 contacts the bottom of the composite insert. The ejector rod 8 passes through the mold base 10, and the ejector rod fixing plate 9 is fixed to the bottom of the ejector rod 8, serving to support the ejector rod 8 and transmit the ejection force. The mold base 10 provides guidance for the ejector rod 8, ensuring that the ejector rod 8 can move vertically up and down, and also supports the entire ejector mechanism and installs it in a suitable position in the mold. The top end of the ejector rod 8 contacts the bottom of the composite insert. After die casting, the ejector rod fixing plate 9 drives the ejector rod 8 to move upward. The three-stage stepped ejector rod pushes the bottom of the composite insert with its top end face, which is 1-2 mm smaller than the bottom diameter of the composite insert.

[0033] The mold structure achieves rapid separation and assembly of the insert components and the mold body through the mold closing cooperation of the front mold frame 1 and the rear mold frame 7. After the heating tube 4 is positioned, the whole component is embedded into the mold, and the ejector mechanism realizes synchronous ejection after forming. The upper movable insert 3 and the lower movable insert 5 are connected by a conical surface mating structure, and their contact surface is provided with a guide taper of 3°-5°.

[0034] The positioning springs 12 are arranged in a ring array within the spring cavity of the lower part 5 of the movable insert. The diameter of the positioning steel ball 11 forms a clearance fit of 0.02-0.05mm with the inner diameter of the spring cavity. The limiting point is a hemispherical groove provided on the bottom surface of the upper part 3 of the movable insert. The ratio of the radius of curvature of the groove to the diameter of the positioning steel ball 11 is 1:1.05-1.2. The lower part 5 of the movable insert is provided with a guide rib 13 on its side. The guide rib 13 slides with the guide groove in the assembly groove of the rear mold core 6.

[0035] The movable insert 3 has a cooling channel 14 inside, with the inlet end of the cooling channel 14 located at the top flange of the movable insert 3. During the die-casting process, the cooling medium enters the cooling channel 14 from the inlet end and circulates within the channel, carrying away the heat generated on the movable insert 3 during the die-casting process, effectively cooling the insert. By controlling the insert temperature, defects such as deformation and shrinkage cavities caused by excessive temperature are avoided, ensuring the stability of product quality. This also helps extend the service life of the insert and reduce production costs.

[0036] The top rod 8 includes a three-stage stepped top rod, the diameter of its top end face is 1-2mm smaller than the bottom diameter of the combined insert, the depth of the positioning groove is 1 / 3-1 / 2 of the diameter of the heating tube 4, and the groove width forms an interference fit of 0.1-0.3mm with the outer diameter of the heating tube 4.

[0037] Specifically, during use, the operator first places the heating element 4 into the positioning groove on the surface of the lower movable insert 5 outside the machine. The heating element is stably fixed by utilizing the interference fit between the groove width and the outer diameter of the heating element, as well as the positioning groove's diameter depth. Next, the upper movable insert 3 and the lower movable insert 5 are connected via a tapered surface mating structure with a guide taper. The positioning spring 12 pushes the positioning steel ball 11 inside the lower movable insert 5, engaging it with the hemispherical groove (limiting point) on the bottom surface of the upper movable insert 3. The ratio of the groove's radius of curvature to the diameter of the positioning steel ball is 1:1.05-1.2, completing the assembly of the combined insert.

[0038] The assembled heating element insert is accurately inserted into the matching assembly slot on the rear mold core 6 via a sliding pair formed by the guide rib 13 on the lower side of the movable insert and the guide groove in the assembly slot of the rear mold core 6. Subsequently, the overall mold assembly is completed by the mold closing cooperation of the front mold base 1 and the rear mold base 7. During the die casting process, the cooling channel 14 inside the movable insert 3 introduces cooling medium from the channel inlet end at the top flange of the insert to cool the insert and ensure the product molding quality.

[0039] After die casting is completed, the ejector mechanism operates. The ejector rod 8, which passes through the mold foot 10, moves upward under the support of the ejector rod fixing plate 9. The three-stage stepped ejector rod pushes the bottom of the composite insert with its top end face, which is 1-2 mm smaller than the bottom diameter of the composite insert, thus ejecting the product and the composite insert simultaneously, completing the product manufacturing process. If it is necessary to replace the insert or reinstall the heating element thereafter, the above steps can be repeated.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold insert quick change structure characterized by, include: The front mold forming part consists of the front mold frame (1) and the front mold core (2) that mates with it; The rear mold forming part consists of the rear mold frame (7) and the rear mold core (6) that cooperates with it; A separable composite insert consisting of upper (3) and lower (5) movable inserts, wherein the surface of the lower (5) movable insert is provided with a positioning groove for positioning the heating tube (4); The rear mold core (6) is provided with an assembly groove that matches the shape of the combined insert; The anti-disengagement mechanism consists of a positioning spring (12) and a positioning steel ball (11). The positioning spring (12) is located inside the lower part (5) of the movable insert, and pushes the positioning steel ball (11) to form a locking point with the limiting point on the upper part (3). The push rod mechanism includes a push rod (8) that passes through the mold foot (10) and a push rod fixing plate (9) that supports the push rod (8). The top of the push rod (8) contacts the bottom of the composite insert.

2. The mold insert quick change structure according to claim 1, characterized by: The upper (3) and lower (5) of the movable insert are connected by a tapered surface mating structure, and their contact surfaces are provided with a guide taper of 3°-5°.

3. The mold insert quick change structure according to claim 1, characterized by: The positioning springs (12) are arranged in a ring array in the spring cavity of the movable insert (5), and the diameter of the positioning steel ball (11) forms a clearance fit of 0.02-0.05mm with the inner diameter of the spring cavity.

4. The mold insert quick change structure according to claim 1, characterized by: The limiting point is a hemispherical groove on the bottom surface of the movable insert (3), and the ratio of the radius of curvature of the groove to the diameter of the positioning steel ball (11) is 1:1.05-1.

2.

5. The mold insert quick change structure according to Claim 1, characterized by: The movable insert has a guide rib (13) on its lower (5) side, and the guide rib (13) and the guide groove in the assembly groove of the rear mold core (6) form a sliding pair.

6. The mold insert quick change structure according to Claim 1, characterized by: The movable insert (3) has a cooling channel (14) inside, and the inlet of the cooling channel (14) is located at the top flange of the movable insert (3).

7. The mold-insert quick-change structure according to Claim 1, characterized by: The top rod (8) includes a three-stage stepped top rod, the diameter of its top end face being 1-2 mm smaller than the bottom diameter of the combined insert.

8. The mold-insert quick-change structure according to Claim 1, characterized by: The depth of the positioning groove is 1 / 3 to 1 / 2 of the diameter of the heating tube (4), and the groove width forms an interference fit of 0.1 to 0.3 mm with the outer diameter of the heating tube (4).

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