Mim injection molding mold in-mold compression material removal feed port structure

Abstract

The utility model relates to a kind of MIM injection molding die in-mold compression material removal feed port structure, belong to MIM injection molding die technical field.It includes male die assembly and female die, the lower of male die assembly is equipped with cutter plate and ejector rod plate, gap is left between the two, and is equipped with a group of spring;The cutter plate is equipped with male die cutter bar, male die cutter bar passes through ejector rod plate and male die assembly to feed port, female die is equipped with female die cutter bar corresponding to male die cutter bar;The ejector rod plate is equipped with a group of for the ejection of molding product ejector pin.This utility model is based on the setting of male die cutter and female die cutter, utilize the gap reserved between cutter plate and ejector rod plate, can carry out primary jacking extrusion to feed port before product ejection, and carry out cutting to feed port in the process of ejecting product, realize the separation of feed port and molding product in mold.

Description

Technical Field

[0001] This utility model belongs to the field of MIM injection molding technology, specifically relating to an inlet structure for removing compressed material in an MIM injection molding mold. Background Technology

[0002] Many watch metal parts require MIM injection molding during production. During molding, a large gate is typically used for side injection. Usually, the gate needs to be manually broken off and then manually trimmed. Manual breaking off results in a rough cut surface at the gate and the gate protrusion exceeds the maximum limit, requiring manual trimming and increasing labor costs significantly. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide an in-mold compression material removal gate structure for MIM injection molding molds. Based on the characteristics of MIM materials, a two-stage lifting gate cutting structure is adopted to achieve separation of the gate and the molded product within the mold.

[0004] This utility model provides the following technical solution:

[0005] A material removal inlet structure for in-mold compression molding of a MIM injection mold includes a male mold assembly and a female mold. A cutter plate and an ejector plate are provided below the male mold assembly, with a gap between them and a set of springs. The cutter plate has a male mold cutter push rod, the upper end of which passes through the ejector plate into the male mold assembly, and the upper end is connected to a male mold cutter. The male mold cutter passes through the male mold assembly to the material inlet. A female mold cutter corresponding to the male mold cutter is provided inside the female mold. The ejector plate has a set of ejector pins for ejecting the molded product.

[0006] Furthermore, the cutting plate includes a lower cutting plate and an upper cutting plate fixed on the lower cutting plate, and the cutting plate moves linearly controlled by the injection molding machine ejection mechanism.

[0007] Furthermore, the lower end of the male mold cutter push rod is limited between the upper and lower cutter plates, and its upper end is engaged with the lower end of the male mold cutter. The upper end of the male mold cutter is provided with a cutter structure, which is positioned corresponding to the feed port. The lower end of the female mold cutter is provided with a matching cutter structure.

[0008] Furthermore, the cutting surface of the male mold cutter structure is flush with the forming surface at the product cutting position, while the cutting surface of the female mold cutter structure is offset from the forming surface at the product cutting position. The end of the female mold cutter structure extends into the upper forming surface of the product, forming a groove structure at the feed inlet cutting position on the upper part of the product.

[0009] Furthermore, the upper end of the male mold cutting rod is inserted into the male mold template in the male mold assembly, and the upper end is provided with a locking protrusion.

[0010] Furthermore, the lower end of the male mold cutter is provided with a groove that mates with the engaging protrusion.

[0011] Furthermore, the ejector plate includes a lower ejector plate and an upper ejector plate stacked on the lower ejector plate. The lower ends of a set of ejector pins are positioned between the upper and lower ejector plates, and the upper ends of the ejector pins pass through the mold assembly to the product forming position.

[0012] By adopting the above-mentioned technology, the beneficial effects of this utility model compared with the prior art are as follows:

[0013] 1) Based on the setting of male mold cutter and female mold cutter, this utility model utilizes the gap reserved between the cutter plate and the ejector plate to perform initial lifting and extrusion of the feed port before the product is ejected, and separates the feed port from the molded product in the mold during the product ejection process. Before the product is taken out of the mold, the feed port is separated from the molded product, ensuring the appearance of the product, eliminating the traditional manual breaking process, reducing operation time and avoiding the problem of rough cross-section caused by manual operation;

[0014] 2) In this utility model, the cutting surfaces of the cutting blades on the male and female die cutting blades are staggered, which can form a groove on the product, allowing the iron filings generated when cutting the feed port to enter the groove and avoid remaining on the product surface; and can also solve the problem of local bulges caused by the cutting blades squeezing the product.

[0015] 3) In this utility model, the mold cutting tool structure adopts a separate structure design of mold cutting tool push rod and mold cutting tool, which can adapt to the processing needs of large-size parts (such as watch parts);

[0016] 4) In this utility model, the cutting blade is driven by the machine lifting mechanism and is buffered by the spring of the ejector plate to realize the timing separation of the shearing action and the ejection action, so as to avoid the deformation of the cut due to the rebound of the material and ensure that the flatness of the shearing surface meets the standard. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0020] Figure 4 This is a schematic diagram of the structure of the male mold cutting tool ejector pin of this utility model;

[0021] Figure 5 This is a schematic diagram showing the corresponding structural arrangement of the male mold cutter and female mold cutter bar of this utility model;

[0022] Figure 6 This is a schematic diagram of the upper ejector plate of this utility model;

[0023] Figure 7 This is a schematic diagram of the upper cutting plate of this utility model;

[0024] Figure 8 This is a schematic diagram of the structure of this utility model;

[0025] Figure 9 This is a schematic diagram of the spring assembly structure between the cutter plate and the ejector plate of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0027] Conversely, this utility model encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this utility model as defined in the claims. Furthermore, to provide the public with a better understanding of this utility model, certain specific details are described in detail in the following description. However, those skilled in the art will fully understand this utility model even without these detailed descriptions.

[0028] Please see Figure 1-9 In this embodiment, there is a 0.3mm distance between the end face of the inlet to be cut and the mold parting surface, and the thickness of the gate is 0.7mm. Based on this size design, this application proposes an in-mold compression material removal inlet structure for MIM injection molding mold, which includes a cutter plate 1, a male mold cutter bar 3, a male mold assembly 3, a female mold 4, an ejector plate 5, and a female mold cutter bar 6. The male mold assembly 3 includes a male mold plate 301 and a male mold 302 disposed on the male mold plate 301; the cutter plate 1 and the ejector plate 5 are disposed below the male mold plate 301.

[0029] Specifically, the cutter plate 1 includes a lower cutter plate 101 and an upper cutter plate 102. The upper cutter plate 102 is stacked on the lower cutter plate 101 and fastened together with screws. The lower cutter plate 101 is raised and lowered by the machine lifting mechanism.

[0030] Specifically, the mold cutter structure adopts a split structure, which includes a mold cutter ejector rod 2 and a mold cutter 6; the lower end of the mold cutter ejector rod 2 is provided with a limiting part, the bottom of the upper cutter plate 102 is provided with a limiting groove, the limiting part of the mold cutter ejector rod 2 is located between the upper and lower cutter plates and is placed in the limiting groove, the upper end of the mold cutter ejector rod 2 passes through the upper cutter plate 102 and the ejector plate 5 to the mold template 301, and the upper end is provided with a locking protrusion 203.

[0031] The lower end of the male mold cutter 6 is inserted into the male mold template 301. The lower end is provided with a slot 204. The engaging protrusion 203 is engaged in the slot 204, so that the male mold cutter 6 is connected to the male mold cutter push rod 2. The upper end of the male mold cutter 6 passes through the male mold template 301 and the male mold 302 to the parting surface at the upper end of the male mold 302. The upper end is provided with a cutting structure, which is directly facing the feed port.

[0032] Specifically, the female mold cutter bar 401 is limited and set inside the female mold 4, and its lower end is provided with a female mold cutter mechanism that cooperates with the upper end cutter structure of the male mold cutter 6.

[0033] The cutting surface of the male mold cutter 6 is flush with the forming surface at the product cutting position. The cutting surface of the female mold cutter 401 is offset from the forming surface at the product cutting position (0.05mm offset inward in this embodiment). The end of the female mold cutter 401 extends into the upper forming surface (0.1mm deep in this embodiment), forming a small groove structure at the top corner of the upper forming surface of the product.

[0034] The staggered arrangement of the cutting surfaces of the male and female die cutters creates a groove on the product, allowing iron filings generated during the cutting of the feed inlet to enter the groove and avoid remaining on the product surface; it also solves the problem of local bulges caused by the cutting blade pressing on the product.

[0035] Specifically, the ejector plate 5 includes a lower ejector plate 501 and an upper ejector plate 502. The upper ejector plate 502 is stacked on the lower ejector plate 501 and fastened together with screws. A set of ejector pins 203 are positioned between the upper and lower ejector plates, with a limiting part at the lower end of the ejector pin 203. The bottom of the upper ejector plate 502 has a matching limiting groove. The upper end of the ejector pin 503 passes through the male mold plate 301 and the male mold 302 to the product forming position.

[0036] A set of guide rods, lifting rods, and springs are provided between the ejector plate 5 and the male mold plate 301. This is a conventional structural design of injection molds and will not be described in detail in this embodiment. Please refer to [link to relevant documentation]. Figure 7 The assembly structure shown.

[0037] A 1mm gap is left between the lower ejector plate 501 and the upper cutter plate 102, and a set of springs is provided. The lower ejector plate 501 and the upper cutter plate 102 are provided with recesses to facilitate the placement of the springs.

[0038] The working process of this utility model structure is as follows:

[0039] S1. After the product is injection molded, the ejector mechanism of the injection molding machine lifts the cutter plate 1 by 0.67mm, leaving a thickness of 0.03mm. Because the MIM part contains iron powder, it cannot be completely flattened, leaving a 0.03mm gap to be removed in subsequent actions.

[0040] S2. The ejection mechanism of the injection molding machine drives the cutter plate 1 to drop by 0.2mm, releasing the pressure between the cutter and the gate material, and waiting for the second ejection.

[0041] S3, Mold opening for both male and female molds.

[0042] S4. The ejector mechanism of the injection molding machine drives the cutter plate 1 to rise 0.53mm. At this time, the flash at the head of the feed port is completely flattened. The machine continues to rise, driving the ejector plate 5 to move upward and eject the molded product.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements 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. An in-mold compression material removal feed gate structure for a MIM injection molding mold, characterized by, The mold includes a male mold assembly (3) and a female mold (4). The male mold assembly (3) is provided with a cutter plate (1) and an ejector plate (5) below it, with a gap between them and a set of springs. The cutter plate (1) is provided with a male mold cutter ejector rod (2). The upper end of the male mold cutter ejector rod (2) passes through the ejector plate (5) into the male mold assembly (3). The upper end is connected to a male mold cutter (6). The male mold cutter (6) passes through the male mold assembly (3) to the feed port. The female mold (4) is provided with a female mold cutter (401) corresponding to the male mold cutter (6). The ejector plate (5) is provided with a set of ejector pins (503) for ejecting the molded product.

2. The in-mold compression material removal gate structure for MIM injection molding molds of claim 1, wherein, The cutting plate (1) includes a lower cutting plate (101) and an upper cutting plate (102) fixed on the lower cutting plate (101). The cutting plate (1) moves linearly controlled by the injection molding machine ejection mechanism.

3. The MIM injection molding mold in-mold compression material removal feed gate structure of claim 2, wherein, The lower end of the male mold cutter push rod (2) is limited between the upper and lower cutter plates, and its upper end is engaged with the lower end of the male mold cutter (6). The upper end of the male mold cutter (6) is provided with a cutter structure, and the cutter structure is set in accordance with the position of the feed port. The lower end of the female mold cutter (401) is provided with a matching cutter structure.

4. The MIM injection molding mold in-mold compression material removal feed gate structure of claim 3, wherein, The cutting surface of the male mold cutter (6) is flush with the forming surface at the product cutting position, and the cutting surface of the female mold cutter (401) is offset from the forming surface at the product cutting position. The end of the female mold cutter (401) extends into the upper forming surface of the product, forming a groove structure at the feed inlet cutting position on the upper part of the product.

5. The MIM injection molding mold in-mold compression material removal gate structure of claim 3, wherein, The upper end of the male mold cutting rod (2) is inserted into the male mold template (301) in the male mold assembly (3), and the upper end is provided with a locking protrusion (203).

6. The MIM injection molding mold in-mold compression material removal gate structure of claim 5, wherein, The lower end of the male mold cutter (6) is provided with a groove (204) that cooperates with the engaging protrusion (203).

7. The MIM injection molding mold in-mold compression material removal gate structure of claim 1, wherein, The ejector plate (5) includes a lower ejector plate (501) and an upper ejector plate (502) stacked on the lower ejector plate (501). The lower end of a set of ejector pins (503) is positioned between the upper and lower ejector plates, and the upper end of the ejector pins (503) passes through the mold assembly (3) to the product forming position.

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