Die for forming medical part based on peek raw material and medical part forming method

Abstract

The invention discloses a mold for forming medical parts based on peek raw materials and a method for forming the medical parts, the mold comprises a fixed mold assembly and a movable mold assembly, the movable mold assembly comprises a movable mold plate, a movable mold insert assembly and a vacuum breaking air blowing assembly, the vacuum breaking air blowing assembly at least comprises an air blowing unit, and the air blowing unit specifically comprises an air inlet connector and an air inlet channel. And the vacuum breaking unit is used for realizing vacuum breaking of the product through the blowing unit. Through the vacuum breaking and blowing assembly, the problem of vacuum breaking of the product is solved, and meanwhile, the vacuum breaking and blowing assembly is also used for cooling medical parts. And the movable mold insert is further subjected to polishing treatment, so that product demolding is facilitated. And meanwhile, different grades of polishing are carried out in the polishing treatment, so that a product can be demolded more easily. Moreover, the insert pin is arranged in the fixed mold assembly of the mold, and the insert pin of the fixed mold assembly is opened in advance through the opening and closing device and is separated from a product, so that the phenomenon that the mold is adhered to a female mold due to the problem of injection molding materials when the mold is directly opened is avoided.

Description

Technical Field

[0001] The invention relates to the field of mold injection molding manufacturing, and in particular to a mold for molding medical parts based on peek raw materials and a method for molding medical parts. Background Art

[0002] PEEK (polyetheretherketone), as a special engineering plastic, is widely used in mechanical parts such as automotive gears, oil screens, shift starter discs, as well as aircraft engines, automatic washing machine wheels, medical equipment, etc. due to its excellent high temperature resistance, self-lubrication, easy processing and high mechanical strength. Figure 1 Shown is the medical product to be molded based on this material in this application.

[0003] In the process of implementing the prior art, the inventor discovered that:

[0004] When demolding the medical component, directly opening the mold can easily cause the product to stick to the mother mold. During the injection molding process, the air in the mold cannot be discharged in time, which will form a negative pressure area, making it difficult to demold the product smoothly. In addition, the thermal deformation temperature of the product is generally 160°C. When the mold is opened, there is a large adhesion between the product and the mold, which also leads to the problem of being unable to demold smoothly. In addition, when molding products made of this material, the inner wall of the product is rough and the surface quality of the mold cannot be guaranteed.

[0005] Therefore, the present application provides a technical solution for a high-quality, easy-to-demand mold to solve the problem of difficult demolding and poor quality of the molded product when using peek raw materials to mold medical parts in the prior art. Summary of the invention

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a mold for molding medical parts based on peek raw materials, comprising a fixed mold assembly and a movable mold assembly, the movable mold assembly at least comprising a movable mold plate, a movable mold insert assembly connected to the movable mold plate for molding products and a vacuum breaking blowing assembly, the movable mold insert assembly comprising a movable mold insert and a connecting assembly for fixing the movable mold insert to the movable mold plate, the vacuum breaking blowing assembly comprising at least one blowing unit, the blowing unit specifically comprising: an air inlet interface arranged on one side of the movable mold plate, an air inlet channel connected to the air inlet interface and passing through the movable mold plate and the connecting assembly, for achieving vacuum breaking of the product through the blowing unit.

[0007] Furthermore, the movable mold insert is processed by a first level of polishing at one end close to the movable mold plate and at one end away from the movable mold plate, and the middle position of the movable mold insert is processed by a second level of polishing.

[0008] Furthermore, the fixed mold assembly includes a fixed mold base, a fixed mold plate 1 connected to the fixed mold base, and a fixed mold plate 2 connected to the fixed mold plate 1 at one end and connected to the movable mold plate of the movable mold assembly at the other end, wherein the end face of the fixed mold plate 1 close to the fixed mold plate 2 is provided with a pin for forming a molding hole for molding a medical component.

[0009] Furthermore, an opener and closer assembly is provided on the outer sides of the fixed mold plate 1, the fixed mold plate 2 and the movable mold plate, which is used to control the fixed mold plate 2 and the fixed mold plate 1 to open first, and then the fixed mold plate 2 and the movable mold plate to open.

[0010] Furthermore, the shutter assembly specifically includes: a first connecting rod connecting the fixed template 1 and the fixed template 2; a second connecting rod connecting the fixed template 2 and the movable template; a tilting block is fixed to the first connecting rod on the side close to the movable template, a connecting block is provided on the end of the second connecting rod close to the fixed template 1, a sliding column extends from one end of the connecting block, one end of the second connecting rod is clamped in the fixed template 2, and the other end is hingedly connected to the movable template 2, so that when the fixed template 1 and the fixed template 2 are opened and separated, the sliding column is tilted by the tilting block and the second connecting rod in the fixed template 2 is popped out, and then the second connecting rod is separated from the fixed template 2.

[0011] Furthermore, the first level of polishing is performed using 400# sandpaper, and the second level of polishing is performed using 800# sandpaper.

[0012] Furthermore, the fixed mold assembly also includes a casting assembly for injecting peek raw materials, and the movable mold assembly also includes an ejection assembly for ejecting movable mold insert products.

[0013] In addition, the present application also provides a method for molding medical parts based on peek raw materials, comprising the following steps: injecting molten peek raw materials into a cavity between a fixed mold component and a movable mold component through a casting component to mold a medical part;

[0014] After a predetermined time has passed, the fixed mold plate 1 and the fixed mold plate 2 of the fixed mold assembly are controlled by the opener and closer assembly to perform the first mold opening, the inlay pin in the fixed mold plate 1 is separated from the forming hole in the medical component, and the sliding column of the second connecting rod is tilted by the tilting block, the second connecting rod connected to the fixed mold plate 2 is popped out, and the movable mold plate and the fixed mold plate are separated to perform the second mold opening; before the second mold opening, after the inlay pin is separated from the forming hole, the vacuum breaking blowing assembly in the movable mold assembly blows the molded medical component through the movable mold insert to break the vacuum; after breaking the vacuum through the vacuum breaking blowing assembly, the medical component is ejected by the ejection assembly of the movable mold assembly to complete the molding of the medical component.

[0015] Compared with the prior art, the present invention provides a mold for forming medical parts based on peek raw materials and a method for forming medical parts, which have the following beneficial effects:

[0016] The vacuum breaking and blowing assembly solves the vacuum breaking problem of the product. At the same time, the vacuum breaking and blowing assembly is also used for cooling medical parts. On this basis, the movable mold insert is also provided with a polishing process to facilitate product demolding. At the same time, the polishing process also performs different levels of polishing to facilitate easier demolding of the product. Moreover, a pin is also provided in the mold fixed mold assembly, and the pin of the fixed mold assembly is opened first through the opener and closed device, and is removed from the product to avoid the phenomenon of sticking to the mother mold due to the problem of injection molding material when the mold is directly opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a medical device;

[0018] Figure 2 A schematic diagram of a mold for molding medical parts based on peek raw materials;

[0019] Figure 3 It is a schematic diagram of the movable mold assembly;

[0020] Figure 4 It is a schematic diagram of the movable mold insert;

[0021] Figure 5 is a schematic diagram of the connected components;

[0022] Figure 6 This is a schematic diagram of the fixed mold assembly;

[0023] Figure 7 for Figure 6 Schematic diagram of the middle needle;

[0024] Figure 8 is a schematic diagram of the switch assembly;

[0025] In the figure: 100, a mold for forming medical parts based on peek raw materials;

[0026] 2. Fixed mold assembly; 21. Fixed mold base; 22. Fixed mold plate 1; 23. Fixed mold plate 2; 24. Inlay pin;

[0027] 3. Moving mold assembly; 30. Moving mold plate; 31. Moving mold insert assembly; 311. Moving mold insert; 312. Connecting assembly; 32. Vacuum breaking and blowing assembly; 321. Blowing unit; 3211. Air inlet interface; 3212. Air inlet channel; 523. Ejector assembly;

[0028] 4. shutter assembly; 41. first connecting rod; 411. tilting block; 42. second connecting rod; 421. connecting block; 422. sliding column;

[0029] 5. Medical equipment. DETAILED DESCRIPTION

[0030] See also Figure 2 , Figure 3 , Figure 6 As shown, the present invention provides a mold 100 for molding medical parts based on peek raw materials, including a fixed mold assembly 2 and a movable mold assembly 3, the movable mold assembly 3 at least including a movable mold plate 30, a movable mold insert assembly 31 for molding products connected to the movable mold plate 30 and a vacuum breaking blowing assembly 32, the movable mold insert assembly 31 includes a movable mold insert 411 and a connecting assembly 312 for fixing the movable mold insert 411 to the movable mold plate 30, the vacuum breaking blowing assembly 32 includes at least one blowing unit 321, the blowing unit 321 specifically includes: an air inlet interface 3211 arranged on one side of the movable mold plate 30, an air inlet channel 3212 connected to the air inlet interface 3211 and passing through the movable mold plate 30 and the connecting assembly 312, for achieving vacuum breaking of the product through the blowing unit 321.

[0031] Specifically, this application is based on the existing injection molds, and is a further improvement on the problem that special materials are prone to sticking during the molding process, which affects the final demolding of the product. Therefore, for those skilled in the art, the conventional components in the fixed mold assembly 2 and the movable mold assembly 3 in the injection mold are no longer described one by one, such as the pouring assembly for peek raw material injection, the ejection assembly 523 in the movable mold assembly 3 for ejecting the movable mold insert 411 product, etc. Only a clearer description is made for the part that allows the medical component 5 to be demolded smoothly, so that it can be more clearly understood how this application achieves higher quality and easier demolding of the medical component 5.

[0032] Specifically, in this application, Figure 4 As shown, the movable mold insert 411 provided on the movable mold plate 30 is polished so that the medical component 5 can be smoothly separated from the movable mold insert 411 and its demolding quality is guaranteed. Preferably, the movable mold insert 411 is polished at one end close to the movable mold plate 30 and at one end away from the movable mold plate 30 by the first level, and the middle position of the movable mold insert 411 is polished at the second level.

[0033] Specifically, in order to ensure smooth demolding of the medical component 5, the present application also performs different levels of polishing on the movable mold insert 411. It can be understood that different levels of polishing, that is, the polishing level of the part that is easy to demold is low, and the polishing level of the part that is not easy to demold is high. Through this setting, the part of the medical component 5 that is difficult to demold can be easily demolded.

[0034] Preferably, the first level of polishing is performed using 400# sandpaper, and the second level of polishing is performed using 800# sandpaper. It can be understood that the polishing level at both ends of the movable mold insert 411 is relatively lower than the polishing level in the middle. Through this hierarchical polishing process, polishing of different parts can reduce the friction between the mold and the product, making it easier to remove the product from the mold. Moreover, through fine polishing, the tiny defects and irregularities on the mold surface can be reduced, thereby ensuring the dimensional accuracy and stability of the product.

[0035] Further, such as Figure 5 As shown, in addition to being used to fix the movable mold insert 411 and the movable mold plate 30, the connecting component 312 is also provided with an air inlet channel 3212 on the connecting component 312 and the movable mold plate 30, so that the air can pass through the air inlet channel 3212 through the air inlet interface 3211 of the movable mold plate 30 to break the vacuum of the medical component 5 on the movable mold insert 411.

[0036] Specifically, the vacuum breaking blowing assembly 32 may be composed of one blowing unit 321 or a plurality of blowing units 321. Through the blowing of the blowing unit 321, the vacuum of the medical component 5 on the movable mold insert 411 is broken.

[0037] It is understandable that the vacuum-breaking blowing assembly 32 mainly solves the problem of product vacuum breaking. During the injection molding process, if the air in the mold cannot be discharged in time, a negative pressure area may be formed, which makes it difficult to smoothly demold the product or produce defective products. By adding a vacuum-breaking blowing assembly 32 to the movable mold assembly 3, this negative pressure state, i.e. "breaking the vacuum", can be effectively destroyed, thereby helping the product to be smoothly demolded. Blowing can help the product fall off from the movable mold insert 411 faster, especially when there is a large adhesion between the product and the mold, blowing can effectively reduce this adhesion, making the product easier to be ejected.

[0038] In addition, the vacuum-breaking blowing assembly 32 is also beneficial to increase cooling of the medical component 5, which is convenient for ejection. The thermal deformation temperature of PEEK raw materials generally reaches about 160°C, so it is very important to strengthen cooling. This means that during the injection molding process, if the cooling is not sufficient, the product may be deformed or dimensionally unstable due to high temperature. Therefore, strengthening cooling is crucial to ensure product quality. By adding cooling measures in the mold, such as using cooling water channels or increasing the cooling time, the molding temperature of the product can be effectively reduced, and the stability and dimensional accuracy of the product can be improved.

[0039] Furthermore, the fixed mold assembly 2 includes a fixed mold base 21, a fixed mold plate 22 connected to the fixed mold base 21, and a fixed mold plate 23 connected to the fixed mold plate 22 at one end and connected to the movable mold plate 30 of the movable mold assembly 3 at the other end, wherein the end surface of the fixed mold plate 22 close to the fixed mold plate 23 is provided with a pin 24 for forming a molding hole for molding the medical component 5.

[0040] Specifically, Figure 7 As shown, the setting of the insert pin 24 is mainly used to avoid the problem of sticking to the mother mold when the mold is opened. The insert pin 24 is an important component in the mold, and is usually used to form the internal holes or detailed features of the product. When designing the insert pin 24, it is necessary to consider its coordination with the product and the demolding method when the mold is opened. By reasonably designing the shape and position of the insert pin 24, it can be ensured that it can be smoothly removed from the product when the mold is opened. As shown in the figure, the countersunk hole on the end face of the molded medical component 5 is formed by the setting of the insert pin 24.

[0041] Furthermore, under the premise of setting the insert pin 24, an opener and closer assembly 4 is provided on the outer sides of the fixed template 1 22, the fixed template 2 23 and the movable template 30, which is used to control the fixed template 2 23 and the fixed template 1 22 to open first, and then the fixed template 2 23 and the movable template 30 to open when the mold is opened.

[0042] Specifically, the fixed mold plate 2 23 and the fixed mold plate 1 22 are opened first, so that the insert pin 24 is opened first and removed from the product, and then the product is separated by separating the movable mold and the fixed mold 2.

[0043] Specifically, Figure 8 As shown, the shutter assembly 4 is a device for controlling the opening and closing sequence of the mold, which can increase the mold opening resistance of a certain parting surface so that other parting surfaces can be opened first. By using the shutter, it can be ensured that during the mold opening process, the insert pins 24 on the female mold side are separated from the product before the fixed mold plate and the movable mold plate 30 are opened, thereby preventing the product from adhering to the female mold.

[0044] Furthermore, the shutter assembly 4 specifically includes: a first connecting rod 41 connecting the fixed mold plate 1 22 and the fixed mold plate 2 23; a second connecting rod 42 connecting the fixed mold plate 2 23 and the movable mold plate 30; the first connecting rod 41 is fixed with a tilting block 411 on the side close to the movable mold plate 30, and the second connecting rod 42 is provided with a connecting block 421 on the end close to the fixed mold plate 1 22, and a sliding column 422 extends from one end of the connecting block 421, one end of the second connecting rod 42 is clamped in the fixed mold plate 2 23, and the other end is hingedly connected to the movable mold plate 30, so that when the fixed mold plate 1 22 and the fixed mold plate 2 23 are opened and separated, the sliding column 422 is tilted by the tilting block 411 and the second connecting rod 42 in the fixed mold plate 23 is popped out, and then the second connecting rod 42 is separated from the connection with the fixed mold plate 23.

[0045] Specifically, the first connecting rod 41 and the second connecting rod 42 are arranged in parallel, and the inclined block 411 of the first connecting rod 41 includes an inclined end face and an end face parallel to the end face of the first connecting rod 41 and connected to the inclined end face. When the fixed mold plate 23 is separated from the fixed mold plate 1 22, the sliding column 422 connected to the connecting block 421 on the second connecting rod 42 slides to the end face parallel to the inclined block 411 through the inclined end face. In this process, the position where the second connecting rod 42 is clamped to the fixed mold plate 23 is lifted by the sliding column 422 of the connecting block 421 and is separated from the fixed mold plate 2 23. It can be understood that after the second connecting rod 42 is separated from the fixed mold plate 2 23, the movable mold plate 30 can be demolded for the second time between the fixed mold plate 2 23, thereby realizing the separation of the product from the mold.

[0046] In addition, the present application also provides a method for forming a medical component using a mold for forming a medical component based on a peek raw material, comprising the following steps:

[0047] S100: injecting molten peek raw material into the cavity between the fixed mold component 2 and the movable mold component 3 through the casting component to form a medical component 5;

[0048] S110: After a predetermined time, the fixed plate 1 22 and the fixed plate 2 23 of the fixed mold assembly 2 are controlled by the shutter assembly 4 to perform the first mold opening, the inlay pin 24 in the fixed plate 1 22 is separated from the forming hole in the medical component 5, and the sliding column 422 of the second connecting rod is tilted by the tilting block 411, the second connecting rod 42 connected to the fixed mold 2 is ejected, and the movable mold plate 30 is separated from the fixed mold plate to perform the second mold opening;

[0049] S120: before the second molding, after the insert pin 24 is separated from the molding hole, the vacuum breaking blowing assembly 32 in the movable mold assembly 3 blows air to the molded medical component 5 through the movable mold insert 411 to break the vacuum;

[0050] S130: After breaking the vacuum through the vacuum breaking blowing assembly 32 , the medical component 5 is ejected through the ejection assembly 523 of the movable mold assembly 3 to complete the molding of the medical component 5 .

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A mold for forming medical parts based on peek raw materials, comprising a fixed mold component and a movable mold component, characterized in that: The movable mold assembly at least includes a movable mold plate, a movable mold insert assembly connected to the movable mold plate for molding products and a vacuum breaking blow assembly, the movable mold insert assembly includes a movable mold insert and a connecting assembly for fixing the movable mold insert to the movable mold plate, the vacuum breaking blow assembly includes at least one blowing unit, and the blowing unit specifically includes: an air inlet interface arranged on one side of the movable mold plate, an air inlet channel connected to the air inlet interface and passing through the movable mold plate and the connecting assembly, which is used to realize vacuum breaking of the product through the blowing unit.

2. The mold for forming medical parts based on peek raw materials according to claim 1, characterized in that: The movable mold insert is processed by first-level polishing at one end close to the movable mold plate and one end away from the movable mold plate, and the middle position of the movable mold insert is processed by second-level polishing.

3. The mold for forming medical parts based on peek raw materials according to claim 1, characterized in that: The fixed mold assembly includes a fixed mold base, a fixed mold plate 1 connected to the fixed mold base, and a fixed mold plate 2 connected to the fixed mold plate 1 at one end and connected to the movable mold plate of the movable mold assembly at the other end, wherein the end surface of the fixed mold plate 1 close to the fixed mold plate 2 is provided with a pin for forming a molding hole for molding a medical component.

4. The mold for forming medical parts based on peek raw materials according to claim 3, characterized in that: An opener and closer assembly is provided on the outer sides of the fixed mold plate 1, the fixed mold plate 2 and the movable mold plate, which is used to control the fixed mold plate 2 and the fixed mold plate 1 to open first, and then the fixed mold plate 2 and the movable mold plate to open.

5. The mold for forming medical parts based on peek raw materials according to claim 4, characterized in that: The switch assembly specifically comprises: A first connecting rod connecting the fixed mold plate 1 and the fixed mold plate 2; A second connecting rod connecting the second fixed template and the movable template; An inclined block is fixed to the side of the first connecting rod close to the movable template, and a connecting block is provided at the end of the second connecting rod close to the fixed template one, and a sliding column extends from one end of the connecting block. One end of the second connecting rod is clamped in the fixed template two, and the other end is hingedly connected to the movable template two, so that when the fixed template one and the fixed template two are opened and separated, the sliding column is inclined by the inclined block and the second connecting rod in the fixed template two is popped out, and then the second connecting rod is separated from the fixed template two.

6. The mold for forming medical parts based on peek raw materials according to claim 2, characterized in that: The first level of polishing is performed using 400# sandpaper, and the second level of polishing is performed using 800# sandpaper.

7. The mold for forming medical parts based on peek raw materials according to claim 1, characterized in that: The fixed mold assembly also includes a casting assembly for injecting peek raw materials, and the movable mold assembly also includes an ejection assembly for ejecting movable mold insert products.

8. A method for forming a medical component using a mold for forming a medical component based on peek raw materials as described in any one of claims 1 to 7, characterized in that: The following steps are involved: The molten peek raw material is injected into the cavity between the fixed mold component and the movable mold component through the casting component to form the medical component; After a predetermined time, the fixed mold plate 1 and the fixed mold plate 2 of the fixed mold assembly are controlled by the shutter assembly to perform the first mold opening, the inlay pin in the fixed mold plate 1 is separated from the forming hole in the medical component, and the sliding column of the second connecting rod is tilted by the tilting block, the second connecting rod clamped on the fixed mold 2 pops out, and the movable mold plate and the fixed mold plate are separated to perform the second mold opening; Before the second molding, after the insert needle is separated from the molding hole, the vacuum breaking blowing assembly in the movable mold assembly blows air to the molded medical component through the movable mold insert to break the vacuum; After breaking the vacuum through the vacuum breaking blowing assembly, the medical component is ejected through the ejection assembly of the movable mold assembly to complete the molding of the medical component.

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