Ceramic part injection mold

Abstract

The utility model discloses a ceramic part injection mold which comprises an upper mold assembly and a lower mold assembly, a forming cavity is formed between the upper mold assembly and the lower mold assembly, a sprue bush is arranged in the upper mold assembly, a fan-fin-shaped sub-runner is arranged in the lower mold assembly, a main runner is arranged at the top of the fan-fin-shaped sub-runner, and a cavity is formed in the lower mold assembly. The main runner is matched with the sprue bush, and the fan-fin-shaped branch runner is communicated with the forming cavity through a sprue. According to the ceramic part injection mold provided by the utility model, the fan-wing-shaped sub-runners are adopted and gradually approach the forming cavity along the direction far away from the main runner, so that the front edge of a material flow in the length direction of a pouring gate simultaneously reaches to form uniform flow; and the phenomenon that the feed entering the cavity is warped and cracked due to internal stress caused by inconsistent cooling due to inconsistent time is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to processing mould technical field, concretely relates to a ceramic piece injection mould. BACKGROUND

[0002] In actual production process, the production mode of the thick and large flat ceramic product with large thickness, large size and smooth surface is generally to press the green body through cold isostatic pressing, and the size is processed through machining after sintering, which is large in workload and low in efficiency, and the processing finished product is high.

[0003] In the prior art, the injection mould production can be directly formed to reduce the workload of machining. However, due to the large thickness of the product, the injection molding is difficult, and bubbles and deformation are prone to occur, and the qualified rate of injection production is low. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a ceramic piece injection mould, and solves the problems of large product thickness, difficult injection molding, easy bubble and deformation, and low qualified rate of injection production.

[0005] Therefore, the utility model provides a ceramic piece injection mould, which comprises an upper mould assembly and a lower mould assembly, a forming cavity is formed between the upper mould assembly and the lower mould assembly, a sprue bushing is arranged in the upper mould assembly, a fan fin-shaped runner is arranged in the lower mould assembly, a main runner is arranged at the top of the fan fin-shaped runner, the main runner is matched with the sprue bushing, and the fan fin-shaped runner is communicated with the forming cavity through a sprue.

[0006] Preferably, the fan fin-shaped runner gradually approaches the forming cavity in the direction away from the main runner.

[0007] Preferably, the sprue is arched.

[0008] Preferably, the arching angle of the sprue ranges from 60° to 120°.

[0009] Preferably, the arching height of the sprue is greater than or equal to the thickness of the inlet of the sprue.

[0010] Preferably, the thickness of the inlet of the sprue is greater than the thickness of the outlet of the sprue.

[0011] Preferably, the upper mould assembly comprises a fixed mould base plate, a fixed mould plate and a fixed mould, the fixed mould base plate is fixedly installed at the top of the fixed mould plate, the fixed mould is installed in the fixed mould plate, an injection inlet is formed in the top of the fixed mould base plate, and the sprue bushing penetrates through the fixed mould plate and the fixed mould and is communicated with the injection inlet.

[0012] Preferably, the lower mold assembly comprises a movable mold base plate, a movable mold plate, a mold foot and a movable mold, the mold foot is fixedly installed on the top of the movable mold base plate, the movable mold plate is fixedly installed on the top of the mold foot, the movable mold is installed inside the movable mold plate, and the movable mold plate is matched with the fixed mold plate to form a forming cavity.

[0013] Preferably, the lower mold assembly further comprises a push plate, a push plate fixing plate, a runner pin and a product pin, the push plate is between the movable mold base plate and the movable mold plate, the push plate fixing plate is fixedly installed on the top of the push plate, the push plate fixing plate is connected with the movable mold plate through a spring, the runner pin and the product pin are fixedly installed on the top of the push plate fixing plate, the product pin penetrates through the movable mold plate and the movable mold to the forming cavity, and the runner pin penetrates through the movable mold plate and the movable mold to the main runner.

[0014] Preferably, a positioning ring is arranged at the injection port.

[0015] Beneficial effects:

[0016] 1. The utility model provides a kind of ceramic injection mold, adopts fan wing shape runner, gradually close to forming cavity along the direction away from main runner, so that the front of material flow in the length direction of gate reaches simultaneously, to form uniform flow, avoid the feeding into cavity because of time inconsistency causes cooling inconsistency to form warping and internal stress to cause cracking.

[0017] 2. In the utility model, the material is blocked by the arch-shaped gate, which can avoid jetting and gas trapping, and the climbing structure can compress the melt to block gas, reducing bubbles and balancing melt flow rate. The yield of injection molded products is high, the deformation is small, and the roughcast with uniform allowance is obtained, which is convenient for subsequent processing. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0019] Figure 1 Structure diagram of embodiment 1 of the ceramic injection mold provided by the utility model Figure 1 .

[0020] Figure 2 Structure diagram of embodiment 1 of the ceramic injection mold provided by the utility model Figure 2 .

[0021] Figure 3The opening and ejection structure diagram of the embodiment 1 of the ceramic part injection mold is provided.

[0022] Figure 4 The gate runner schematic diagram of the embodiment 1 of the ceramic part injection mold is provided.

[0023] Figure 5 The gate enlarged view of the embodiment 1 of the ceramic part injection mold is provided.

[0024] Figure 6 The injection green compact diagram of the embodiment 1 of the ceramic part injection mold is provided.

[0025] Figure 7 The general cold isostatic pressing green compact diagram.

[0026] In the figure, (1), positioning ring; (2), fixed mold base plate; (3), fixed mold plate; (4), moving mold plate; (5), push plate fixed plate; (6), push plate; (7), moving mold base plate; (8), runner ejector pin; (9), forming cavity; (10), moving mold; (11), fixed mold; (12), main runner; (13), gate sleeve; (14), mold foot; (15), product ejector pin; (16), arch bridge-shaped gate; (17), fan-shaped runner. DETAILED DESCRIPTION

[0027] The content of the present application can be more easily understood by referring to the following detailed description of the preferred embodiments of the present application and included examples. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. If there is a conflict between the definitions in the specification and those in the patent, the definitions in the specification are intended to prevail.

[0028] Embodiment 1:

[0029] In the actual production process, for the thick, large size and smooth surface of the thick and large flat ceramic product, the production method is generally through cold isostatic pressing green compact, and the size is machined after sintering, which has large work load, low efficiency and high processing finished product. The cold isostatic pressing green compact is shown in Figure 7 .

[0030] The embodiment is used to solve the problems of difficult injection molding, easy to produce bubbles and deformation, and low qualified rate of injection production due to the large thickness of the product.

[0031] The present application provides a kind of ceramic part injection mold, as shown in Figure 1The injection mold for ceramic parts comprises an upper mold assembly and a lower mold assembly, a forming cavity 9 is formed between the upper mold assembly and the lower mold assembly, a gate bushing 13 is arranged in the upper mold assembly, and a fan-shaped runner 17 is arranged in the lower mold assembly, the top of the fan-shaped runner 17 is provided with a main runner 12, the main runner 12 is matched with the gate bushing 13, and the fan-shaped runner 17 is communicated with the forming cavity 9 through a gate 16.

[0032] The fan-shaped runner 17 gradually approaches the forming cavity 9 in the direction away from the main runner 12. The material flow front in the length direction of the gate 16 reaches at the same time to form uniform flow, avoiding the cooling inconsistency caused by the time inconsistency of the feeding into the cavity, and avoiding the warping and internal stress caused by the cracking.

[0033] The gate 16 is arched. The arch angle of the gate 16 ranges from 60° to 120°, and preferably is 90°. The arch height of the gate 16 is greater than or equal to the thickness of the inlet of the gate 16. The thickness of the inlet of the gate 16 is greater than the thickness of the outlet of the gate 16. The arched gate 16 blocks the material, avoids the formation of jet and gas trapping, and the climbing structure can compress the melt to block the gas, so as to reduce the bubbles and balance the melt flow rate. The injection molded product has high yield, small deformation, uniform allowance, and is convenient for subsequent processing.

[0034] The upper mold assembly comprises a fixed mold 11 base plate 2, a fixed mold 11 plate 3 and a fixed mold 11, the fixed mold 11 base plate 2 is fixedly installed on the top of the fixed mold 11 plate 3, the fixed mold 11 is installed in the fixed mold 11 plate 3, the top of the fixed mold 11 base plate 2 is provided with an injection inlet, the gate bushing 13 penetrates through the fixed mold 11 plate 3 and the fixed mold 11 and is communicated with the injection inlet. A positioning ring 1 is arranged at the injection inlet.

[0035] The lower mold assembly comprises a movable mold 10 base plate 7, a movable mold 10 plate 4, a mold foot 14 and a movable mold 10, the mold foot 14 is fixedly installed on the top of the movable mold 10 base plate 7, the movable mold 10 plate 4 is fixedly installed on the top of the mold foot 14, the movable mold 10 is installed in the movable mold 10 plate 4, and the movable mold 10 plate 4 is matched with the fixed mold 11 plate 3 to form the forming cavity 9.

[0036] The lower mold assembly further comprises a push plate 6, a push plate fixed plate 5, a runner ejector pin 8 and a product ejector pin 15, the push plate 6 is between the movable mold 10 base plate 7 and the movable mold 10 plate 4, the push plate fixed plate 5 is fixedly installed on the top of the push plate 6, the push plate fixed plate 5 is connected with the movable mold 10 plate 4 through a spring, the runner ejector pin 8 and the product ejector pin 15 are fixedly installed on the top of the push plate fixed plate 5, the product ejector pin 15 penetrates through the movable mold 10 plate 4 and the movable mold 10 to the forming cavity 9, and the runner ejector pin 8 penetrates through the movable mold 10 plate 4 and the movable mold 10 to the main runner 12. The product ejector pin 15 is used for ejecting the formed product, and the runner ejector pin 8 is used for ejecting the material in the main runner 12.

[0037] Working principle: the molten ceramic feed is injected into the bushing 13, through the main runner 12 and fan-shaped runner 17 to the gate 16, and then injected into the cavity 9 through the gate 16. After molding, the upper and lower mold assemblies are separated, the injection molding machine lifts the push plate 6, and the product ejector pin 15 on the push plate fixing plate 5 ejects the molded product, and the runner ejector pin 8 ejects the material in the main runner 12. The produced product is as shown. Figure 6

[0038] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features. The modification or replacement does not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A ceramic part injection mold characterized by, The application relates to a mold assembly, which comprises an upper mold assembly and a lower mold assembly, a forming cavity is formed between the upper mold assembly and the lower mold assembly, a sprue bushing is arranged in the upper mold assembly, a fan fin-shaped runner is arranged in the lower mold assembly, a main runner is arranged at the top of the fan fin-shaped runner, the main runner is matched with the sprue bushing, the fan fin-shaped runner is communicated with the forming cavity through a gate, and the gate is arched.

2. The ceramic part injection mold of claim 1, wherein, The fan fin-shaped runner gradually approaches the forming cavity in a direction away from the main runner.

3. The ceramic part injection mold of claim 1, wherein, The arched angle of the gate ranges from 60 DEG to 120 DEG.

4. The ceramic part injection mold of claim 1, wherein, The arched height of the gate is greater than or equal to the thickness of the gate inlet.

5. The ceramic part injection mold of claim 1, wherein, The thickness of the gate inlet is greater than the thickness of the gate outlet.

6. The ceramic part injection mold of claim 1, wherein, The upper mold assembly comprises a fixed mold base plate, a fixed mold plate and a fixed mold, the fixed mold base plate is fixedly installed at the top of the fixed mold plate, the fixed mold is installed in the fixed mold plate, an injection inlet is arranged at the top of the fixed mold base plate, and the sprue bushing penetrates through the fixed mold plate and the fixed mold and is communicated with the injection inlet.

7. The ceramic part injection mold of claim 6, wherein, The lower mold assembly comprises a movable mold base plate, a movable mold plate, a mold foot and a movable mold, the mold foot is fixedly installed at the top of the movable mold base plate, the movable mold plate is fixedly installed at the top of the mold foot, the movable mold is installed in the movable mold plate, and the movable mold plate is matched with the fixed mold plate to form a forming cavity.

8. The ceramic part injection mold of claim 7, wherein, The lower mold assembly further comprises a push plate, a push plate fixing plate, a runner top pin and a product top pin, the push plate is arranged between the movable mold base plate and the movable mold plate, the push plate fixing plate is fixedly installed at the top of the push plate, the push plate fixing plate is connected with the movable mold plate through springs, the runner top pin and the product top pin are fixedly installed at the top of the push plate fixing plate, the product top pin penetrates through the movable mold plate and the movable mold to the forming cavity, and the runner top pin penetrates through the movable mold plate and the movable mold to the main runner.

9. The ceramic part injection mold of claim 7, wherein, A positioning ring is arranged at the injection inlet.

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