Fluoroplastic magnetic drive pump impeller compression molding die

Abstract

The utility model discloses a compression molding die for a fluoroplastic magnetic drive pump impeller, and aims to solve the problems that in the secondary molding process of the magnetic drive pump impeller in the prior art, the size deviation is easy to occur because the molding is not in place, so that a metal insert cannot be completely wrapped by fluoroplastic, the metal insert is exposed, and a workpiece is scrapped. According to the technical scheme, the die comprises a bottom die and a charging barrel arranged on the bottom die, a pressure head assembly is arranged in the charging barrel, and the bottom die, the charging barrel and the pressure head assembly are matched to form a cavity; a spring seat is arranged at the bottom of the bottom die, a first core rod is arranged in the spring seat in a sliding mode, and an elastic abutting piece is arranged between the bottom of the first core rod and the bottom of the spring seat. The pressing head assembly comprises a second core rod abutting against the first core rod.

Description

Technical Field

[0001] The utility model relates to the technical field of impeller production, and more specifically, to a forming die for pressing a fluoroplastic magnetic pump impeller. Background Art

[0002] At present, the production process of fluoroplastic magnetic pump impellers mostly adopts the following two methods: the first method uses silicon carbide inserts and is formed in one step; the second method uses metal inserts and is formed in two steps. Silicon carbide is widely used due to its excellent corrosion resistance, but it is prone to cracking at high temperatures and has a high unit cost. Metal inserts have the characteristics of high temperature resistance and high strength, but once the metal inserts are exposed to the external environment, they are prone to corrosion. Therefore, it is necessary to form in two steps and wrap the metal inserts with fluoroplastic.

[0003] As Figure 1 shown, in the prior art, before pressing the impeller, fluoroplastic particles need to first fill the cavity, and then the fluoroplastic is heated to a molten state and then formed into an impeller by pressing. During this process, since fluoroplastic will accumulate on the base 91 before pressing, the fluoroplastic will block the core rod 92 during pressing, resulting in incomplete pressing, dimensional deviation in processing, and the metal insert not being completely wrapped by fluoroplastic. As a result, the metal insert is exposed and prone to corrosion, causing the workpiece to be scrapped. Summary of the Utility Model

[0004] The utility model overcomes the problem that in the process of secondary forming of the magnetic pump impeller in the prior art, dimensional deviation is likely to occur due to incomplete forming, resulting in the metal insert not being completely wrapped by fluoroplastic, and thus the metal insert is exposed and the workpiece is scrapped. The utility model provides a forming die for pressing a fluoroplastic magnetic pump impeller. During the process of pressing the impeller, the pressing head can be completely pressed in place, reducing dimensional deviation, so that the metal insert can be completely wrapped by fluoroplastic, and the situation of metal part exposure will not occur, thereby improving the qualified rate of the product.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions: a forming die for pressing a fluoroplastic magnetic pump impeller, comprising: a bottom die, a barrel arranged on the bottom die, a pressing head assembly arranged in the barrel, and the bottom die, the barrel and the pressing head assembly cooperate to form a cavity; a spring seat is arranged at the bottom of the bottom die, a first core rod is slidably arranged in the spring seat, and an elastic abutting member is arranged between the bottom of the first core rod and the bottom of the spring seat; the pressing head assembly includes a second core rod abutting against the first core rod.

[0006] In the utility model, an elastic abutting member is arranged in the spring seat, and the mandrel is decomposed into a first mandrel and a second mandrel. The first mandrel can slide in the spring seat. Before pressing, when adding fluoroplastics particles into the bottom die, due to the blocking effect of the first mandrel, the fluoroplastics particles will not fall into the spring seat, so that when pressing, the pressing head assembly can be completely pressed in place, thereby reducing dimensional deviation, enabling the metal insert to be completely wrapped by fluoroplastics, and preventing the metal part from being exposed, thus improving the product qualification rate.

[0007] Preferably, the elastic abutting member is a spring arranged in the spring seat, and the two ends of the spring respectively abut against the end of the first mandrel and the bottom end of the spring seat.

[0008] The spring has good elasticity and can provide continuous elastic force for the first mandrel.

[0009] Preferably, the pressing head assembly includes an outer pressing head and a quick-change pressing head; the outer pressing head cooperates with the barrel; a pressing head hole is arranged in the center of the outer pressing head, the quick-change pressing head cooperates with the pressing head hole, and the end of the second mandrel away from the first mandrel abuts against the quick-change pressing head.

[0010] Through the cooperation of the outer pressing head and the quick-change pressing head, secondary pressing of the impeller can be realized, making the forming efficiency of the impeller better.

[0011] Preferably, a first limiting portion is arranged at the end of the outer pressing head away from the cavity. When the impeller is pressed and formed, the first limiting portion abuts against the end of the barrel away from the cavity.

[0012] The first limiting portion can prevent the outer pressing head from having too much pressing amount in the barrel when pressing the impeller, and play a limiting role on the outer pressing head.

[0013] Preferably, a second limiting portion is arranged at the end of the quick-change pressing head away from the cavity. When the impeller is pressed and formed, the second limiting portion abuts against the end of the outer pressing head away from the cavity.

[0014] The second limiting portion can prevent the quick-change pressing head from moving excessively in the outer pressing head when pressing and forming the impeller, thereby playing a limiting role on the quick-change pressing head.

[0015] Preferably, the quick-change pressing head includes a first quick-change pressing head and a second quick-change pressing head. The first quick-change pressing head performs the first pressing on the impeller, and the second quick-change pressing head performs the second pressing on the impeller; an insert positioning member is arranged at one end of the first quick-change pressing head close to the cavity, and the insert positioning member is detachably connected to the metal insert.

[0016] The insert positioning part enables the metal insert to be fixedly connected to the insert positioning part during the first pressing of the fluoroplastics, so that the metal insert can be fixed at the center position of the impeller when the fluoroplastics are pressed. After the fluoroplastics are formed, the metal insert is embedded in the formed impeller. Then, the first quick-change punch is separated from the metal insert, and the formed impeller is secondarily pressed by the second quick-change punch, so that the fluoroplastics can completely cover the metal insert.

[0017] Preferably, the quick-change punch is provided with an abutting hole that cooperates with the second mandrel.

[0018] The second mandrel abuts against the abutting hole, enabling the second mandrel to stably abut against the quick-change punch.

[0019] Preferably, the insert positioning part is provided with a positioning hole, and the metal insert is threadedly connected to the positioning hole.

[0020] The detachable connection between the positioning hole and the metal insert is achieved through threaded connection, enabling the metal insert to be fixed during the first pressing, so that the metal insert can be at the central position within the formed impeller. After the impeller is pressed and formed, by rotating the first quick-change punch in the reverse direction, the first quick-change punch can be separated from the metal insert, facilitating the secondary pressing of the impeller.

[0021] Preferably, a mandrel positioning hole is provided at the end of the first mandrel close to the second mandrel, and the second mandrel abuts against the end of the mandrel positioning hole.

[0022] The provision of the mandrel positioning hole enables the second mandrel to stably abut against the end of the first mandrel.

[0023] Preferably, the second mandrel includes a square prism and cylinders provided at both ends of the square prism, and the diameter of the cylinders is less than or equal to the side length of the square prism.

[0024] The diameters of the cylinders at both ends of the square prism are respectively the same as the diameters of the abutting holes on the quick-change punch and the mandrel positioning holes on the second mandrel. When the second quick-change punch secondarily presses the impeller, the second quick-change punch can abut against the end face of the square prism, thereby pushing the second mandrel to perform pressing. After the impeller is formed, the square prism can form a square hole at the center position of the impeller, facilitating the later assembly of the impeller.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows: Compared with the prior art, the mandrel is decomposed into a first mandrel and a second mandrel. The first mandrel can slide within the spring seat. Before pressing, when adding fluoroplastics particles into the bottom die, due to the blocking effect of the first mandrel, the fluoroplastics particles will not fall into the spring seat, enabling the press head assembly to be fully pressed in place during pressing, thereby reducing dimensional deviation, ensuring that the metal insert can be completely wrapped by the fluoroplastics without any exposure of the metal part, and thus improving the qualified rate of the product. Brief Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the prior art in the background art of the present utility model.

[0027] Figure 2 is a schematic structural diagram of the present utility model.

[0028] Figure 3 is a schematic structural diagram of the cooperation between the first quick press head and the cavity of the present utility model.

[0029] Figure 4 is a schematic structural diagram of the cooperation between the second quick press head and the cavity of the present utility model.

[0030] Figure 5 is a top view of the second mandrel of the present utility model.

[0031] Figure 6 is Figure 5 a cross-sectional view taken along the a-a direction in

[0032] Figure 7 is a schematic structural diagram in the second embodiment of the present utility model.

[0033] In the figures: 1, bottom die; 11, blade frame; 12, die core; 13, blade; 14, bottom die bottom hole;

[0034] 2, barrel;

[0035] 3, spring seat; 31, base hole; 32, ventilation hole;

[0036] 4, elastic abutting member;

[0037] 5, first mandrel; 51, convex platform; 52, annular groove; 53, mandrel positioning hole; 54, sealing ring;

[0038] 6, second mandrel; 61, square prism; 62, cylinder;

[0039] 7, external press head; 71, press head hole; 72, first limiting portion;

[0040] 8. Quick-change punch head, 81. First quick-change punch head, 82. Second quick-change punch head, 83. Second limiting part, 84. Insert positioning part, 85. Positioning hole, 86. Abutting hole;

[0041] 9. Metal insert, 91. Base, 92. Mandrel. Detailed implementation manners

[0042] The technical solutions of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings:

[0043] Embodiment 1: Refer to Figures 2 to 6 As shown, a forming mold for a fluoroplastic magnetic pump impeller includes: a bottom mold 1, a barrel 2 provided on the bottom mold 1, a punch head assembly is provided in the barrel 2, and the bottom mold 1, the barrel 2 and the punch head assembly cooperate to form a cavity; a spring seat 3 is provided at the bottom of the bottom mold 1, a first mandrel 5 is slidably provided in the spring seat 3, and an elastic abutting member 4 is provided between the bottom of the first mandrel 5 and the bottom of the spring seat 3; the punch head assembly includes a second mandrel 6 that abuts against the first mandrel 5.

[0044] In this application, an elastic abutting member 4 is provided in the spring seat 3, and the mandrel is decomposed into a first mandrel 5 and a second mandrel 6. The first mandrel 5 can slide in the spring seat 3. Before pressing, when adding fluoroplastic particles into the bottom mold 1, due to the blocking effect of the first mandrel 5, the fluoroplastic particles will not fall into the spring seat 3, so that during pressing, the punch head assembly can be completely pressed in place, thereby reducing dimensional deviation, so that the metal insert 9 can be completely wrapped by fluoroplastic, and there will be no situation where the metal part is exposed, thereby improving the qualified rate of the product.

[0045] Embodiment 2: Refer to Figures 2 to 6 As shown, a forming mold for a fluoroplastic magnetic pump impeller includes: a bottom mold 1, a barrel 2 provided on the bottom mold 1, a punch head assembly is provided in the barrel 2, and the bottom mold 1, the barrel 2 and the punch head assembly cooperate to form a cavity for pressing an impeller; a spring seat 3 is provided at the bottom of the bottom mold 1, a first mandrel 5 is slidably provided in the spring seat 3, and an elastic abutting member 4 is provided between the bottom of the first mandrel 5 and the bottom of the spring seat 3; the punch head assembly includes a second mandrel 6 that abuts against the first mandrel 5. A blade frame 11, a mold core 12 and blades 13 are provided in the cavity.

[0046] The circumferential direction of the bottom die 1 and the circumferential direction of the barrel 2 are fixedly connected by a plurality of bolts, so that the bottom die 1 and the barrel 2 are fixed together to form an integral structure. A bottom die bottom hole 14 is provided through the center position at the bottom of the bottom die 1. The spring seat 3 is matched with the bottom die bottom hole 14. A base hole 31 is also provided in the spring seat 3. The base hole 31 is matched with the bottom die bottom hole 14 to form the entire bottom hole. The first mandrel 5 slides in the bottom hole. When pressing the impeller into shape, after the first mandrel 5 is subjected to pressure, it will move downward against the acting force of the elastic abutting member 4.

[0047] The elastic abutting member 4 is a spring provided in the spring seat 3. The elastic abutting member 4 includes but is not limited to a spring. For example, an air spring, rubber and other structures can be used instead. The two ends of the spring are respectively abutted against the end of the first mandrel 5 and the bottom end of the spring seat 3. In order to enable the spring to stably abut against the end of the first mandrel 5, a boss 51 protruding towards the end face is provided at the end of the first mandrel 5. The diameter of the boss 51 is smaller than the diameter of the first mandrel 5, so that a ring groove 52 for cooperating with the spring is formed between the boss 51 and the inner wall of the base hole 31.

[0048] The pressing head assembly includes an outer pressing head 7 and a quick-change pressing head 8; the outer pressing head 7 is a cylindrical structure 62, and the outer pressing head 7 is matched with the barrel 2; a pressing head hole 71 is provided through the central axis position of the outer pressing head 7. The quick-change pressing head 8 is matched with the pressing head hole 71. The quick-change pressing head 8 slides in the pressing head hole 71. The end of the second mandrel 6 far from the first mandrel 5 abuts against the quick-change pressing head 8.

[0049] In order to prevent the outer pressing head 7 from having too much pressing amount in the barrel 2 when pressing the impeller, a first limiting portion 72 is provided at the end of the outer pressing head 7 far from the cavity. The first limiting portion 72 can be a plurality of limiting blocks provided on the outer pressing head 7. The first limiting portion 72 in this embodiment is a first limiting ring provided in the circumferential direction of the outer pressing head 7. The diameter of the first limiting ring is larger than the diameter of the outer pressing head 7. When the impeller is pressed into shape, the first limiting ring abuts against the end of the barrel 2 far from the cavity. At this time, the first limiting ring plays a role in limiting the outer pressing head 7 to prevent the outer pressing head 7 from pressing excessively.

[0050] Similarly, in order to prevent the quick-change pressing head 8 from moving excessively in the outer pressing head 7 when pressing the impeller into shape, a second limiting portion 83 is provided at the end of the quick-change pressing head 8 far from the cavity. The second limiting portion 83 can be a plurality of limiting blocks provided on the quick-change pressing head 8. The first limiting portion 72 in this embodiment is a second limiting ring provided in the circumferential direction of the quick-change pressing head 8. The diameter of the second limiting ring is larger than the diameter of the quick-change pressing head 8. When the impeller is pressed into shape, the second limiting portion 83 abuts against the end of the outer pressing head 7 far from the cavity, so that the second limiting ring plays a role in limiting and abutting against the quick-change pressing head 8.

[0051] There are two quick-change punches 8, which include a first quick-change punch 81 and a second quick-change punch 82. The first quick-change punch 81 performs the first pressing on the impeller, and the second quick-change punch 82 performs the second pressing on the impeller.

[0052] An insert positioning member 84 is provided at one end of the first quick-change punch 81 close to the cavity, and the insert positioning member 84 is detachably connected to the metal insert 9. The insert positioning member 84 enables the metal insert 9 to be fixedly connected to the insert positioning member 84 when the first pressing of the fluoroplastics is performed, so that when the fluoroplastics are pressed, the metal insert 9 can be fixed at the center position of the impeller. After the fluoroplastics are molded, the metal insert 9 is embedded in the molded impeller. Then, the first quick-change punch 81 is separated from the metal insert 9, and the second quick-change punch 82 performs the second pressing on the molded impeller, so that the fluoroplastics can completely cover the metal insert 9.

[0053] In this embodiment, a positioning hole 85 is provided on the insert positioning member 84, and the metal insert 9 is threadedly connected to the positioning hole 85. In this embodiment, the detachable connection between the positioning hole 85 and the metal insert 9 is realized by means of threaded connection, so that the metal insert 9 can be fixed during the first pressing, and thus the metal insert 9 can be at the center position inside the molded impeller. After the impeller is pressed and molded, by rotating the first quick-change punch 81 in the reverse direction, the first quick-change punch 81 can be separated from the metal insert 9, which is convenient for performing the second pressing on the impeller.

[0054] The quick-change punch 8 is provided with a butting hole 86 that cooperates with the second mandrel 6. On the first quick-change punch 81, the end of the first mandrel 5 and the bottom of the butting hole 86 are fixedly connected by bolts. After the first pressing is completed, the bolts are removed, so that the first mandrel 5 is separated from the first quick-change punch 81.

[0055] In order to enable the first mandrel 5 and the second mandrel 6 to cooperate with each other during pressing. A mandrel positioning hole 53 is provided at the end of the first mandrel 5 close to the second mandrel 6, and the end of the first mandrel 5 abuts against the mandrel positioning hole 53.

[0056] The second mandrel 6 includes a square prism 61 and cylinders 62 provided at both ends of the square prism 61. The diameter of the cylinders 62 is less than or equal to the side length of the square prism 61. The diameters of the cylinders 62 at both ends of the square prism 61 are the same as the diameters of the butting holes 86 on the quick-change punch 8 and the mandrel positioning holes 53 on the second mandrel 6 respectively. When the second quick-change punch 82 performs the second pressing on the impeller, the second quick-change punch 82 can abut against the end face of the square prism 61, thereby pushing the second mandrel 6 to perform pressing. And after the impeller is molded, the square prism 61 can form a square hole at the center position of the impeller, which is convenient for the later assembly of the impeller.

[0057] The working principle of this embodiment includes the following steps:

[0058] (1) The first mandrel 5, the die core 12, the blade 13, the bottom die 1, the blade frame 11, the barrel 2, the spring seat 3 and the spring are assembled to form a cavity, and FEP fluoroplastic particles are loaded into the cavity; when loading the FEP fluoroplastic particles into the cavity, since the spring supports the first mandrel 5, the FEP fluoroplastic particles can be blocked from entering the base hole 31;

[0059] (2) The second mandrel 6, the first quick-change press head 81 and the external press head 7 are assembled into one body, and the first quick-change press head 81 and the metal insert 9 are assembled into one body;

[0060] (3) The external press head 7 and the barrel 2 are matched, and after being heated at a high temperature for a certain period of time, a press is used to apply pressure to the first quick-change press head 81, so that the molten FEP fluoroplastic particles are filled into the cavities of the blade 13 and the bottom die 1;

[0061] (4) When the gap between the first limiting part 72 and the barrel 2 is less than 5 mm, the first quick-change press head 81 is quickly replaced with the second quick-change press head 82, and then the pressure is maintained until the formed impeller cools to room temperature.

[0062] In this application, an elastic abutting member 4 is arranged in the spring seat 3, and the mandrel is decomposed into a first mandrel 5 and a second mandrel 6. The first mandrel 5 can slide in the spring seat 3. Before pressing, when adding fluoroplastic particles into the bottom die 1, due to the blocking effect of the first mandrel 5, the fluoroplastic particles will not fall into the spring seat 3, so that during pressing, the press head assembly can be completely pressed in place, thereby reducing dimensional deviation, so that the metal insert 9 can be completely wrapped by fluoroplastic, and there will be no situation where the metal part is exposed, thus improving the qualified rate of the product.

[0063] Embodiment 2: Refer to Figures 2 to 6 As shown, a fluoroplastic magnetic pump impeller pressing and forming die includes: a bottom die 1, a barrel 2 arranged on the bottom die 1, a press head assembly is arranged in the barrel 2, and the bottom die 1, the barrel 2 and the press head assembly cooperate to form a cavity for pressing the impeller; a spring seat 3 is arranged at the bottom of the bottom die 1, a first mandrel 5 is slidably arranged in the spring seat 3, and an elastic abutting member 4 is arranged between the bottom of the first mandrel 5 and the bottom of the spring seat 3; the press head assembly includes a second mandrel 6 that abuts against the first mandrel 5. A blade frame 11, a die core 12 and a blade 13 are arranged in the cavity.

[0064] The circumferential directions of the bottom die 1 and the barrel 2 are fixedly connected by a plurality of bolts, so that the bottom die 1 and the barrel 2 are fixed together to form an integral structure. A bottom die bottom hole 14 is penetrated through the center position at the bottom of the bottom die 1. The spring seat 3 is matched with the bottom die bottom hole 14. A base hole 31 is also arranged in the spring seat 3. The base hole 31 is matched with the bottom die bottom hole 14 to form the entire bottom hole. The first mandrel 5 slides in the bottom hole. When pressing the impeller into shape, after the first mandrel 5 is subjected to pressure, it will move downward against the acting force of the elastic abutting member 4.

[0065] The elastic abutting member 4 is a spring arranged in the spring seat 3. The elastic abutting member 4 includes but is not limited to a spring. For example, an air spring, rubber and other structures can be used instead. The two ends of the spring respectively abut against the end of the first mandrel 5 and the bottom end of the spring seat 3. In order to enable the spring to stably abut against the end of the first mandrel 5, a boss 51 protruding towards the end face is arranged at the end of the first mandrel 5. The diameter of the boss 51 is smaller than the diameter of the first mandrel 5, so that a ring groove 52 for cooperating with the spring is formed between the boss 51 and the inner wall of the base hole 31.

[0066] The pressing head assembly includes an outer pressing head 7 and a quick-change pressing head 8; the outer pressing head 7 is a cylindrical 62-shaped structure, and the outer pressing head 7 is matched with the barrel 2; a pressing head hole 71 is penetrated through the central axis position of the outer pressing head 7. The quick-change pressing head 8 is matched with the pressing head hole 71. The quick-change pressing head 8 slides in the pressing head hole 71. The end of the second mandrel 6 far from the first mandrel 5 abuts against the quick-change pressing head 8.

[0067] In order to prevent the outer pressing head 7 from having too much pressing amount in the barrel 2 when pressing the impeller, a first limiting portion 72 is arranged at the end of the outer pressing head 7 far from the cavity. The first limiting portion 72 can be a plurality of limiting blocks arranged on the outer pressing head 7. The first limiting portion 72 in this embodiment is a first limiting ring arranged in the circumferential direction of the outer pressing head 7. The diameter of the first limiting ring is larger than the diameter of the outer pressing head 7. When the impeller is pressed into shape, the first limiting ring abuts against the end of the barrel 2 far from the cavity. At this time, the first limiting ring plays a role in limiting the outer pressing head 7 to prevent the outer pressing head 7 from pressing excessively.

[0068] Similarly, in order to prevent the quick-change pressing head 8 from moving excessively in the outer pressing head 7 when pressing the impeller into shape, a second limiting portion 83 is arranged at the end of the quick-change pressing head 8 far from the cavity. The second limiting portion 83 can be a plurality of limiting blocks arranged on the quick-change pressing head 8. The first limiting portion 72 in this embodiment is a second limiting ring arranged in the circumferential direction of the quick-change pressing head 8. The diameter of the second limiting ring is larger than the diameter of the quick-change pressing head 8. When the impeller is pressed into shape, the second limiting portion 83 abuts against the end of the outer pressing head 7 far from the cavity, so that the second limiting ring plays a role in limiting and abutting against the quick-change pressing head 8.

[0069] There are two quick-change punches 8, which include a first quick-change punch 81 and a second quick-change punch 82. The first quick-change punch 81 performs the first pressing on the impeller, and the second quick-change punch 82 performs the second pressing on the impeller.

[0070] An insert positioning member 84 is provided at one end of the first quick-change punch 81 close to the cavity, and the insert positioning member 84 and the metal insert 9 are detachably connected. The insert positioning member 84 enables the metal insert 9 to be fixedly connected to the insert positioning member 84 when the fluoroplastic is pressed for the first time, so that the metal insert 9 can be fixed at the center position of the impeller when the fluoroplastic is pressed. After the fluoroplastic is molded, the metal insert 9 is embedded in the molded impeller. Then, the first quick-change punch 81 is separated from the metal insert 9, and the second quick-change punch 82 performs the second pressing on the molded impeller, so that the fluoroplastic can completely cover the metal insert 9.

[0071] In this embodiment, a positioning hole 85 is provided on the insert positioning member 84, and the metal insert 9 is threadedly connected to the positioning hole 85. In this embodiment, the detachable connection between the positioning hole 85 and the metal insert 9 is realized by means of threaded connection, so that the metal insert 9 can be fixed during the first pressing, and thus the metal insert 9 can be at the center position inside the molded impeller. When the impeller is pressed and formed, by rotating the first quick-change punch 81 in the reverse direction, the first quick-change punch 81 can be separated from the metal insert 9, which is convenient for the second pressing of the impeller.

[0072] A butting hole 86 cooperating with the second mandrel 6 is provided on the quick-change punch 8. On the first quick-change punch 81, the end of the first mandrel 5 and the bottom of the butting hole 86 are fixedly connected by bolts. After the first pressing is completed, the bolts are removed, so that the first mandrel 5 is separated from the first quick-change punch 81.

[0073] In order to enable the first mandrel 5 and the second mandrel 6 to cooperate with each other during pressing. A mandrel positioning hole 53 is provided at the end of the first mandrel 5 close to the second mandrel 6, and the end of the first mandrel 5 abuts against the mandrel positioning hole 53.

[0074] The second mandrel 6 includes a square prism 61 and cylinders 62 provided at both ends of the square prism 61. The diameter of the cylinders 62 is less than or equal to the side length of the square prism 61. The diameters of the cylinders 62 at both ends of the square prism 61 are the same as the diameters of the butting hole 86 on the quick-change punch 8 and the mandrel positioning hole 53 on the second mandrel 6 respectively. When the second quick-change punch 82 performs the second pressing on the impeller, the second quick-change punch 82 can abut against the end face of the square prism 61, thereby pushing the second mandrel 6 to perform pressing. And after the impeller is formed, the square prism 61 can form a square hole at the center position of the impeller, which is convenient for the later assembly of the impeller.

[0075] Referring to Figure 7 As shown, in this embodiment, a sealing ring 54 is provided in the circumferential direction of the first mandrel 5, and a vent hole 32 is provided at the bottom of the spring seat 3. The provision of the sealing ring 54 can effectively prevent the molten fluoroplastics from flowing downward through the gap between the sealing ring 54 and the inner wall of the spring seat 3, and the provision of the vent hole 32 enables the first mandrel 5 to slide smoothly within the base hole 31.

[0076] The working principle of this embodiment includes the following steps:

[0077] (1) The first mandrel 5, the die core 12, the blade 13, the bottom die 1, the blade frame 11, the barrel 2, the spring seat 3 and the spring are assembled to form a cavity, and FEP fluoroplastic particles are loaded into the cavity; when loading the FEP fluoroplastic particles into the cavity, since the spring holds up the first mandrel 5, it can block the FEP fluoroplastic particles from entering the base hole 31;

[0078] (2) The second mandrel 6, the first quick-change press head 81 and the external press head 7 are assembled into one body, and the first quick-change press head 81 and the metal insert 9 are assembled into one body;

[0079] (3) The external press head 7 and the barrel 2 are fitted together, and after being heated at a high temperature for a certain period of time, a press is used to apply pressure to the first quick-change press head 81, so that the molten FEP fluoroplastic particles are filled into the cavities of the blade 13 and the bottom die 1;

[0080] (4) When the gap between the first limiting portion 72 and the barrel 2 is less than 5 mm, the first quick-change press head 81 is quickly replaced with the second quick-change press head 82, and then the pressure is maintained until the formed impeller cools to room temperature.

[0081] In this application, an elastic abutting member 4 is provided in the spring seat 3, and the mandrel is decomposed into a first mandrel 5 and a second mandrel 6. The first mandrel 5 can slide within the spring seat 3. Before pressing, when adding fluoroplastic particles into the bottom die 1, due to the blocking effect of the first mandrel 5, the fluoroplastic particles will not fall into the spring seat 3, so that during pressing, the press head assembly can be completely pressed in place, thereby reducing dimensional deviation, so that the metal insert 9 can be completely wrapped by the fluoroplastics, and there will be no situation where the metal parts are exposed, thus improving the qualified rate of the product.

[0082] The above-described embodiments are only preferred solutions of the present utility model, and do not impose any form of limitation on the present utility model. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A fluoroplastic magnetic pump impeller pressing mold, characterized in that: include: A bottom mold and a barrel arranged on the bottom mold, a pressing head assembly is arranged in the barrel, and the bottom mold, the barrel and the pressing head assembly cooperate to form a cavity; a spring seat is arranged at the bottom of the bottom mold, a first core rod is slidably arranged in the spring seat, and an elastic abutment is arranged between the bottom of the first core rod and the bottom of the spring seat; the pressing head assembly includes a second core rod abutting against the first core rod.

2. The fluoroplastic magnetic pump impeller pressing mold according to claim 1 is characterized in that: The elastic abutment is a spring arranged in the spring seat, and two ends of the spring are respectively abutted against the end of the first core rod and the bottom end of the spring seat.

3. The fluoroplastic magnetic pump impeller pressing mold according to claim 1 is characterized in that: The pressure head assembly includes an external pressure head and a quick-change pressure head; the external pressure head cooperates with the barrel; a pressure head hole is arranged at the center of the external pressure head, the quick-change pressure head cooperates with the pressure head hole, and the end of the second core rod away from the first core rod abuts against the quick-change pressure head.

4. The fluoroplastic magnetic pump impeller pressing mold according to claim 3 is characterized in that: The end of the external pressure head away from the cavity is provided with a first limiting portion. When the impeller is pressed and formed, the first limiting portion abuts against the end of the barrel away from the cavity.

5. The fluoroplastic magnetic pump impeller pressing mold according to claim 3 is characterized in that: A second limiting portion is provided at the end of the quick-change pressure head away from the cavity. When the impeller is pressed and formed, the second limiting portion abuts against the end of the external pressure head away from the cavity.

6. The fluoroplastic magnetic pump impeller pressing mold according to any one of claims 3 to 5, characterized in that: The quick-change press head includes a first quick-change press head and a second quick-change press head. The first quick-change press head performs a first pressing on the impeller, and the second quick-change press head performs a second pressing on the impeller. An insert locating piece is provided at one end of the first quick press head close to the cavity, and the insert locating piece and the metal insert are detachably connected.

7. The fluoroplastic magnetic pump impeller pressing mold according to claim 3 is characterized in that: The quick-change pressure head is provided with an abutment hole matched with the second core rod.

8. The fluoroplastic magnetic pump impeller pressing mold according to claim 6 is characterized in that: The insert positioning piece is provided with a positioning hole, and the metal insert is threadedly connected to the positioning hole.

9. The fluoroplastic magnetic pump impeller pressing mold according to any one of claims 1 to 3, characterized in that: A mandrel positioning hole is arranged at the end of the first mandrel close to the second mandrel, and the end of the second mandrel is in abutment with the end of the mandrel positioning hole.

10. The fluoroplastic magnetic pump impeller pressing mold according to any one of claims 1 to 3, characterized in that: The second core rod comprises a square prism and cylinders arranged at both ends of the square prism, and the diameter of the cylinder is less than or equal to the side length of the square prism.

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