A resin tooth thermoforming mold

Abstract

This utility model belongs to the field of resin tooth fabrication technology, specifically relating to a resin tooth thermoforming mold, including an upper mold and a lower mold. The upper side of the lower mold has multiple positioning elements, each including multiple positioning bosses arranged sequentially from bottom to top and smoothly connected on the outside. The lower side of the upper mold has positioning grooves that match the positioning elements. The upper side of the lower mold has multiple first grooves. Multiple cavities are respectively provided on opposite sides of the upper and lower molds. Adjacent rows of cavities on the lower mold are positioned opposite each other within corresponding first grooves. The lower side of the upper mold has protrusions that correspond and match the first grooves, and adjacent rows of cavities on the upper mold are positioned opposite each other on corresponding protrusions. This utility model effectively increases the width of the first groove by increasing the symmetrical arrangement of adjacent rows of cavities within the same first groove, reducing the difficulty of mold processing, and improves mold closing accuracy through the cooperation of multiple positioning bosses and positioning grooves.

Description

Technical Field

[0001] This utility model belongs to the field of resin tooth manufacturing technology, specifically relating to a resin tooth hot pressing molding mold. Background Technology

[0002] In the preparation of resin teeth, the resin material is weighed according to a certain ratio and then put into a mixer for thorough mixing. During the mixing process, the mixing time and speed need to be controlled to ensure that the material is fully and evenly mixed. Then, the mixed resin material is put into a mold and the temperature is controlled within an appropriate range. When the material reaches a certain temperature, it is compressed and molded by the pressure of the upper mold.

[0003] Currently, the following problems exist in the hot pressing process of resin teeth: the guide post of the lower mold and the corresponding opening of the upper mold are used to guide and prevent displacement. However, the contact surface between the guide post and the corresponding opening is not tight enough, which cannot guarantee the mold closing accuracy, thus leading to axial misalignment of the tooth and affecting the accuracy and shape of the restoration.

[0004] Furthermore, in order to facilitate mold opening after the resin tooth is formed, the cavities (i.e., mold cavities) on the upper and lower molds of the existing resin tooth thermoforming molds are set at an angle. This setting requires corresponding grooves and protrusions to be set on the opposite sides of the upper and lower molds respectively. Currently, each cavity corresponds to one groove or protrusion, which makes the side wall inclination angle of the groove or protrusion large, resulting in high mold processing difficulty and easy material accumulation, making it difficult to remove the tooth. Summary of the Invention

[0005] This invention addresses the problems of low mold closing accuracy and high processing difficulty in existing resin tooth hot pressing molds by providing a resin tooth hot pressing mold. By rationally configuring the cavities on the mold, the corresponding grooves or protrusions are made smoother, reducing the processing difficulty of the mold. Furthermore, positioning components are used to ensure the alignment of the upper and lower molds during mold closing, preventing misalignment.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A resin tooth thermoforming mold includes an upper mold and a lower mold. The upper side of the lower mold is provided with multiple positioning elements, each positioning element including multiple positioning bosses arranged sequentially from bottom to top. The upper side of the lower positioning boss covers the lower side of the positioning boss above it. Adjacent positioning bosses are smoothly connected on their outer sides. The multiple positioning elements are evenly distributed circumferentially on the upper side of the lower mold. The lower side of the upper mold is provided with positioning grooves that match the positioning elements. Through the cooperation of multiple positioning bosses, when the upper mold and the lower mold are closed, the correction effect of lateral displacement during mold closing is improved, and the mold closing accuracy is improved.

[0008] The lower mold has multiple spaced first grooves on its upper side, with both ends of the first grooves penetrating the outer side of the lower mold. The upper and lower molds have multiple corresponding and matching cavities on opposite sides. Two adjacent rows of cavities on the lower mold are arranged opposite each other in the corresponding first grooves. The lower side of the upper mold has protrusions that correspond to and match the first grooves. Two adjacent rows of cavities on the upper mold are arranged opposite each other on the corresponding protrusions. By arranging cavities opposite each other on the first grooves or protrusions, the width of the grooves or protrusions is increased, thereby reducing the difficulty of mold processing.

[0009] Preferably, the parting surface of the cavity is inclined relative to its wall thickness direction, and the inclination angle α is 4-7°. Compared with existing molds, the inclination angle of the parting surface is reduced, which reduces the processing difficulty.

[0010] Preferably, the tilt angle α is 4° or 5°.

[0011] Preferably, the cavity end face on the lower side of the upper mold corresponds to the cavity end face on the upper side of the lower mold, ensuring that the cavities on the upper and lower molds are matched and guaranteeing the quality of the molded resin teeth.

[0012] Preferably, the upper mold includes a first upper mold and a second upper mold, wherein the cavity depth of the first upper mold is smaller than the cavity depth of the second upper mold. First, the lower part of the resin tooth is prepared by the cooperation of the first upper mold and the lower mold, and then the complete resin tooth is prepared by the cooperation of the second upper mold and the lower mold.

[0013] Preferably, a first positioning post is fixedly installed in the middle of the uppermost positioning boss, and a positioning hole corresponding to the first positioning post is opened on the upper mold, so as to ensure the initial vertical correspondence between the upper and lower molds through the positioning post.

[0014] Preferably, each of the positioning elements includes two positioning bosses.

[0015] The beneficial effects of this utility model through the above technical solution are as follows:

[0016] 1. In the hot pressing molding die of this utility model, when the mold is closed, the first positioning post ensures that the upper mold and the lower mold are vertically aligned. Then, multiple positioning parts cooperate to position the mold closing process. First, the positioning boss located above performs lateral coarse positioning, and then the positioning boss located below performs precise positioning, ensuring the accuracy of mold closure during mold closing, effectively suppressing lateral offset during the mold closing process, improving mold closing accuracy, reducing the mold closing deviation rate to below 2%, and improving the tooth morphology qualification rate.

[0017] 2. This utility model optimizes the cavity arrangement on the mold, so that two rows of cavities are arranged opposite each other on the same first groove. Compared with the existing mold lower mold, the width of the first groove is widened (or the width of the protrusion on the upper mold is widened). While ensuring the cavity arrangement density on the mold, on the one hand, the slope of the first groove is made gentle, reducing the difficulty of mold processing. On the other hand, it prevents the problem of material accumulation in the groove during mold opening, which causes difficulty in tooth removal.

[0018] On the other hand, it avoids the problem of excessive local pressure caused by an excessively narrow mold closing surface, which accelerates mold steel fatigue, crack propagation, and shortens mold life. Furthermore, the resin material extruded during the hot pressing process falls into the first groove, and widening the width of the first groove effectively reduces the difficulty of cleaning it.

[0019] 3. This utility model optimizes the tilt angle of the mold cavity parting surface along the thickness direction, making it smoother, effectively reducing the difficulty of mold processing, improving the tightness of the closure of the upper and lower mold cavities when the mold is closed, reducing the mold processing defect rate, improving the quality of tooth forming, and reducing the amount of post-processing work. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the lower mold structure of this utility model. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the lower mold structure of this utility model. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the lower mold structure of this utility model. Figure 3 .

[0023] Figure 4 This is a cross-sectional structural diagram of the cavity of this utility model.

[0024] Figure 5 This is a schematic diagram of the upper mold of this utility model.

[0025] The numbers in the attached diagram are as follows: 1 is the upper mold, 2 is the lower mold, 3 is the positioning boss, 4 is the positioning groove, 5 is the first groove, 7 is the cavity, 8 is the first positioning post, and 9 is the second positioning post. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] like Figures 1-5As shown, this embodiment provides a resin tooth thermoforming mold, including an upper mold 1 and a lower mold 2. The upper mold 1 includes a first upper mold and a second upper mold. The first upper mold and the second upper mold have the same structure, except that the cavity 7 depth of the first upper mold is smaller than the cavity 7 depth of the second upper mold. In use, since the resin tooth is white on top and yellow on the bottom, the lower yellow part of the resin tooth is usually prepared by first using the first upper mold and the lower mold 2. After completing the thermoforming, resin material is placed on the lower mold 2 again. The upper white part of the resin tooth is thermoformed by the second upper mold and the lower mold 2 and thermoformed into one piece with the lower yellow part, thus completing the thermoforming of the resin tooth. During preparation, the resin material placed in the cavity 7 of the lower mold 2 is melted by heating, and the pressure of the upper mold is used to form it into a tooth shape in the cavity 7.

[0028] The lower mold 2 is provided with multiple positioning components on its upper side. Each positioning component includes multiple positioning bosses 3 arranged sequentially from bottom to top. The upper side of the lower positioning boss 3 covers the lower side of the upper positioning boss 3. That is, the size of the positioning bosses 3 decreases sequentially from bottom to top. The outer sides of adjacent positioning bosses 3 are smoothly connected, or the upper side edges of two adjacent positioning bosses 3 are rounded. The multiple positioning components are evenly distributed circumferentially on the upper side of the lower mold 2. The lower side of the upper mold 1 is provided with positioning grooves 4 that match the positioning components. Thus, during the mold closing process of the upper mold 1 and the lower mold 2, the positioning is achieved by the positioning grooves 4 cooperating with the positioning components to prevent lateral displacement.

[0029] As one possible implementation, each of the positioning components includes two positioning bosses 3. The lower positioning boss 3 adopts a rectangular guide snap-fit ​​structure and is integrally formed with the lower mold 2, which makes it stronger and better fixed. It is set at the four upper corners of the lower mold 2. At the end of the mold closing, it achieves precise positioning in the XYZ axis direction through the outer conical surface to ensure the accuracy of mold closure. The upper positioning boss 3 adopts a tapered positioning pin structure and is interference-fitted with the moving mold to effectively ensure positioning accuracy and stability and prevent the positioning pin from loosening or falling off during the mold closing process.

[0030] A first positioning post 8 is fixedly installed in the middle of the uppermost positioning boss 3, and a second positioning post 9 is fixedly installed on the upper side of the lower mold 2. The upper mold 1 has positioning holes corresponding to the first positioning post 8 and the second positioning post 9. Specifically, during mold closing, the first positioning post 8 and the second positioning post 9 pass through the corresponding positioning holes to make the upper mold 1 and the lower mold 2 correspond vertically. Then, the upper positioning boss 3 enters the corresponding positioning groove 4 to achieve lateral coarse positioning of the upper mold 1 and the lower mold 2. When the mold closing is completed, all positioning bosses 3 are in contact with the corresponding positioning grooves 4 to achieve lateral precise positioning and effectively ensure the mold closing accuracy.

[0031] The lower mold 2 has multiple spaced first grooves 5 on its upper side, with both ends of the first grooves 5 penetrating the outer side of the lower mold 2. The upper mold 1 and the lower mold 2 have multiple corresponding and matching cavities 7 on opposite sides. Two adjacent rows of cavities 7 on the lower mold 2 are arranged opposite each other in the corresponding first grooves 5. The first grooves 5 are used to tilt the cavities 7, which facilitates demolding after the resin teeth are hot-pressed. That is, the tilt of the cavities 7 as a whole makes it easier to pull out the molded resin teeth from the cavities 7. At the same time, the arrangement of two rows of cavities 7 in the first grooves 5 increases the width of the first grooves 5 compared to the structure where each row of cavities 7 corresponds to one first groove 5, making the transition of the first grooves 5 smoother, reducing the difficulty of mold processing, and making it easier to clean the material in the first grooves 5. The lower side of the upper mold 1 has protrusions that correspond to and match the first grooves 5. Two adjacent rows of cavities 7 on the upper mold 1 are arranged opposite each other on the corresponding protrusions.

[0032] The parting surface of the cavity 7 is inclined relative to its wall thickness direction, with an inclination angle α of 4-7°. More specifically, the inclination angle α is 4° or 5°. Compared with the complex parting surface of traditional molds, this makes the parting surface of the cavity 4 flatter, reduces processing difficulty, and improves the closure tightness of the cavity 7. The width of the parting surface is 1.5-2mm, more specifically, 1.5-1.75mm. Compared with the 0.8-1mm width of the parting surface of existing molds, the wider parting surface design can effectively avoid excessive local pressure on the parting surface during mold closing, reduce crack propagation caused by mold steel fatigue, and extend the service life of the mold.

[0033] The end face of the cavity 7 on the lower side of the upper mold 1 corresponds to the end face of the cavity 7 on the upper side of the lower mold 2, ensuring that the parting surfaces of the upper mold 1 and the cavity 7 on the lower mold 2 fit tightly when the mold is closed, thus ensuring the quality of the resin tooth molding.

[0034] As one possible implementation method, the mold adopts a circular design with a diameter of 130mm. Compared with square or other irregularly shaped molds, it can effectively reduce the ineffective pressure-bearing area, improve vulcanization efficiency, and reduce energy consumption.

[0035] This invention achieves vertical alignment between the upper mold 1 and the lower mold 2 during mold closing by using a first positioning post 8, a second positioning post 9, and corresponding positioning holes. By employing a positioning component composed of multi-level positioning bosses 3 in conjunction with the positioning groove 4, lateral displacement of the mold during mold closing is minimized. Simultaneously, by widening the width of the first groove 5 without affecting the quality of resin tooth molding or increasing demolding difficulty, the mold processing difficulty is reduced, and it is easier to clean residual material in the first groove 5 after hot pressing. By designing a flatter parting surface for the cavity 7, the mold processing difficulty is further reduced. Thus, it can effectively improve the processing and production difficulty of the resin tooth hot pressing mold, improve the mold closing accuracy during resin tooth production, and ensure the quality of resin tooth molding.

[0036] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A resin tooth hot pressing mold, characterized in that, The upper mold (1) and the lower mold (2) are provided with a plurality of positioning components on the upper side of the lower mold (2). The positioning components include a plurality of positioning bosses (3) arranged sequentially from bottom to top. The upper side of the lower positioning boss (3) covers the lower side of the upper positioning boss (3). The outer sides of adjacent positioning bosses (3) are smoothly connected. The plurality of positioning components are evenly distributed on the upper side of the lower mold (2) in the circumferential direction. The lower side of the upper mold (1) is provided with positioning grooves (4) that match the positioning components. The lower mold (2) has multiple spaced first grooves (5) on its upper side. The two ends of the first grooves (5) penetrate the outer side of the lower mold (2). The upper mold (1) and the lower mold (2) have multiple corresponding and matching cavities (7) on their opposite sides. Two adjacent rows of cavities (7) on the lower mold (2) are arranged opposite to each other in the corresponding first grooves (5). The lower side of the upper mold (1) has protrusions that correspond to and match the first grooves (5). Two adjacent rows of cavities (7) on the upper mold (1) are arranged opposite to each other on the corresponding protrusions.

2. The resin tooth hot pressing mold according to claim 1, characterized in that, The parting surface of the cavity (7) is inclined relative to its wall thickness direction, and the inclination angle α is 4-7°.

3. The resin tooth hot pressing mold according to claim 2, characterized in that, The tilt angle α is 4° or 5°.

4. The resin tooth hot pressing mold according to claim 1, characterized in that, The end face of the cavity (7) on the lower side of the upper mold (1) corresponds to the end face of the cavity (7) on the upper side of the lower mold (2).

5. A resin tooth hot pressing mold according to claim 4, characterized in that, The upper mold (1) includes a first upper mold and a second upper mold, wherein the cavity (7) depth of the first upper mold is less than the cavity (7) depth of the second upper mold.

6. The resin tooth hot pressing mold according to claim 1, characterized in that, The uppermost positioning boss (3) is fixedly provided with a first positioning post (8) in the middle, and the upper mold (1) is provided with a positioning hole corresponding to the first positioning post (8).

7. The resin tooth hot pressing mold according to claim 1, characterized in that, Each of the aforementioned positioning elements includes two positioning bosses.

Images