Injection mold for plastic parts with metal inserts

Abstract

The application relates to an injection mold with a metal insert plastic part, a core III is coaxially sleeved outside a core II, the core II is arranged to pass through the core III, the core III is coaxially arranged with a lower mold cavity, the core I is coaxially contacted with the core II after being arranged to pass through a distribution channel; when the mold is closed, the core I, the core II and the core III are surrounded after the left mold cavity and the right mold cavity are closed, an upper mold cavity is formed, the upper mold cavity is communicated with the lower mold cavity, the core I forms a smooth section of a bucket neck, the core II forms a sawtooth section of the bucket neck, an upper section of the core III forms a bucket body of the plastic part, a middle section is used for accurately positioning an inner hole of a blade, and a lower section is used for determining the height of the blade at the middle section; the left mold cavity and the right mold cavity are combined to form an outer surface of the plastic part; the lower mold cavity is used for forming a bucket tail of the plastic part. The application completes the forming of characteristic structures such as an inner surface bucket neck, a bucket body and a bucket tail of the plastic part, simultaneously realizes the smooth taking-out of the plastic part after the mold is opened, and the blade insert part can be conveniently arranged in the core III before the mold is closed and accurately placed at a correct position.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold with a metal insert plastic part. Background Technology

[0002] Metal-embedded plastic parts used in industries such as electronics, machinery, chemicals, pharmaceuticals, and plastics are manufactured using injection molding technology. These parts contain insert blades, and are available in 12 sizes, ranging from 12 to 36 mm in diameter. The plastic parts are funnel-shaped, such as... Figure 1 As shown, it consists of a bucket neck 31-1, a bucket body 31-2, a bucket tail 31-3, etc., made of ABS+GF20, with beautiful inner and outer surfaces and no defects such as flash or joint marks. The insert blade 32 is a thin-walled sleeve-type metal part. The insert and the plastic part have coaxiality requirements, and the control accuracy is within 0.04mm. Therefore, the mold requirements for this plastic part are high. (1) It must be able to meet the order requirements of multiple specifications of series products; (2) The insert blade in the mold should be reliably positioned and accurately matched; (3) The removal of the plastic part and the placement of the insert blade should be convenient and safe; (4) The mold should achieve automatic demolding. Traditional molds are difficult to meet the processing requirements of this plastic part. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the problem that traditional molds are difficult to meet the processing requirements of plastic parts with metal inserts used in disposable circumcision cutters, an injection mold with metal inserts is provided.

[0004] The technical solution adopted by this invention to solve its technical problem is: an injection mold with a metal insert plastic part, comprising:

[0005] Gating system: The gating system includes a sprue sleeve, on which a main runner and branch runners are provided;

[0006] Moving mold: The moving mold is located below the fixed mold. The moving mold includes a cavity mold. The cavity mold has a lower cavity. Core II and core III are fixedly installed on the cavity mold. Core III is coaxially sleeved outside core II. Core II protrudes from core III. Core III is coaxially arranged with the lower cavity. Core III is divided into an upper section, a middle section and a lower section.

[0007] Fixed mold: The gating system is fixedly installed on the fixed mold, which is provided with a runner. The fixed mold includes a core I, which passes through the runner and is in coaxial contact with a core II.

[0008] The half mechanism is located between the fixed mold and the movable mold, and comprises a left slider and a right slider, the left slider is provided with a left gate and a left cavity which are in communication with each other, the left gate is located directly above the left cavity, the left gate is in communication with the runner, the right slider is provided with a right gate and a right cavity which are in communication with each other, the right gate is located directly above the right cavity, and the right gate is in communication with the runner.

[0009] When the mold is closed, the left cavity and the right cavity are closed to surround the core I, the core II and the core III, thereby forming an upper cavity, the upper cavity is in communication with the lower cavity, the core I forms a smooth section of the neck of the mold, the core II forms a sawtooth section of the neck of the mold, the upper section of the core III forms a body of the plastic part, the middle section is used for accurately positioning the inner hole of the blade, and the lower section is used for determining the height of the blade at the middle section; the left cavity and the right cavity are combined to form an outer surface of the plastic part; and the lower cavity is used for forming a tail of the plastic part.

[0010] The push-out mechanism comprises a push rod seat, a plurality of round push rods and a plurality of flat push rods are fixedly installed on the push rod seat, the plurality of round push rods are circumferentially distributed along a central axis of the plastic part, the action points of the plurality of round push rods are all located on the arc inner surface of the body of the plastic part, and the top surfaces of the plurality of round push rods are all attached to the arc inner surface of the body of the plastic part; the number of the plurality of flat push rods is equal to the number of the tail of the plastic part, the plurality of flat push rods are one-to-one corresponding to the plurality of tail, and the end face shape of the flat push rod is the same as the cross section of the tail.

[0011] The injection mold of the plastic part with metal insert of the present application is designed in the form of a common wheel gate, and two wheel-shaped distribution channels are arranged. However, the gate position of the common wheel gate is on the inner surface of the plastic part, and gate marks will be left on the inner surface. For the plastic part, the inner surface has size and appearance requirements, and the gate marks are not allowed. Therefore, the gate position is improved, and the gate is arranged at the end of the plastic part. Since the left cavity and the right cavity are combined to form the outer surface of the plastic part, the left gate is located directly above the left cavity, and the right gate is located directly above the right cavity. The arrangement of the gate will not affect the inner surface and appearance of the plastic part. When designing the core, the core is designed in a combined structure due to the special shape of the plastic part. The core includes core I, core II and core III. Compared with the overall structure of the core, the combined structure is easier to process, and the precision of the parts is easy to guarantee. Through the above core combined structure design, the features such as the neck, body and tail of the inner surface of the plastic part are formed, and the plastic part is smoothly taken out after the mold is opened. The blade insert can be easily inserted into the core III before the mold is closed, and accurately placed in the correct position. Since the plastic part is a long and round sleeve type deep cavity product, a half mechanism can be used to form the outer surface of the plastic part and realize the demolding of the plastic part. When the mold is closed, the left slider and the right slider are combined to form the outer surface of the plastic part, and the core forms the mold cavity. When the mold is opened, the left and right sliders are opened, and the plastic part is separated. The round push rod is distributed on both sides of the body reinforcement rib, and the action point is on the inner surface of the body arc of the plastic part. The top surface of the plurality of round push rods is in contact with the inner surface of the body arc of the plastic part. The end face shape of the flat push rod is the same as the cross section of the tail, and the flat push rod acts on the end face of each tail. The push mark is left on the end face of the tail, which does not affect the appearance quality, and more importantly, it can reduce the force of the round push rod on the plastic part, avoid deformation and damage of the plastic part at the action point of the push rod. The flat push rod and the round push rod are fixed on the push rod seat, and the push rod seat is used to shorten the length of the push rod and improve the stiffness of the push rod.

[0012] The metal insert plastic part used by the disposable foreskin cutting and suturing device has multiple specifications, in order to save the manufacturing and processing cost of the mold, when the mold is designed, 12 specifications of series products are classified into 6 groups, and each group has 2 specifications, the mold adopts one mold with two cavity layouts, therefore, the distribution channel has two, and the two distribution channels are respectively located on the two sides of the main flow channel, since each set of mold has two specifications of product cavities, in order to realize that two specifications of products can be processed at the same time or a certain specification of product can be processed alone during injection molding, the gate sleeve is provided with a diversion valve, the diversion valve is provided with a first flow channel, a second flow channel and a third flow channel which are communicated with each other, the first flow channel and the second flow channel are located on the same straight line, and the third flow channel is perpendicular to the straight line formed by the first flow channel and the second flow channel, when the first flow channel and the second flow channel in the diversion valve are communicated with the two distribution channels respectively, the mold can simultaneously injection mold two specifications of products, when the third flow channel is communicated with one of the distribution channels, the mold of the application only injection molds the product formed by the cavity connected with the distribution channel

[0013] Further, the fixed mold further comprises a fixed mold base plate, a positioning ring and a core fixing plate, the positioning ring is detachably installed on the upper surface of the fixed mold base plate, the core fixing plate is fixedly installed on the lower surface of the fixed mold base plate, the lower surface of the core fixing plate is provided with a mold closing guide groove for accommodating the left slider and the right slider, the bottom of the mold closing guide groove is provided with a through hole for accommodating the diversion valve, the distribution channel is provided on the core fixing plate and located on the two sides of the through hole, the core I is fixedly installed on the core fixing plate, and the core I is combined with the core II after penetrating through the distribution channel.

[0014] Further, the movable mold further comprises a movable mold base plate, a backing plate and a movable mold plate, the movable mold plate is fixedly installed on the movable mold base plate through the backing plate, the concave die is fixedly installed on the movable mold plate, and the left slider and the right slider are both slidingly arranged on the movable mold plate.

[0015] Further, the half mechanism further comprises a left inclined guide column, a right inclined guide column, a stop block and a wear plate, the left inclined guide column and the right inclined guide column are both fixedly installed on the core fixing plate, the movable mold plate is provided with a left guide inclined hole and a right guide inclined hole, one end of the left inclined guide column is inserted into the left guide inclined hole after penetrating through the left slider, one end of the right inclined guide column is inserted into the right guide inclined hole after penetrating through the right slider, the two stop blocks are both fixedly installed on the movable mold plate, and the two stop blocks are respectively located on the side of the left slider and the right slider, so as to limit the left slider and the right slider from excessively moving out of the movable mold plate, and the two wear plates are respectively fixedly installed on the left slider and the right slider, and the two wear plates are combined with the guide surfaces of the mold closing guide grooves during mold closing.

[0016] Further, the push-out mechanism comprises a push plate and a guide plate, the push plate is located between the two pad plates, the push plate is fixedly provided with a push rod fixed plate, the push rod seat is fixedly provided on the push rod fixed plate, the transition plate is fixedly provided on the push rod seat, the guide plate is fixedly provided below the die of the movable die plate, and the round push rod and the flat push rod are sequentially provided through the transition plate and the guide plate.

[0017] In order to make the fixed mold and the movable mold run more smoothly, a guide assembly is arranged between the fixed mold and the movable mold, the guide assembly comprises a guide sleeve and a guide column, the guide sleeve is fixedly installed on the core fixed plate, the guide column is fixedly installed on the movable die plate, and the guide column is coaxially and slidingly inserted into the guide sleeve.

[0018] In order to facilitate the reset of the push-out mechanism, an elastic reset mechanism is arranged between the push-out mechanism and the movable mold, the elastic reset mechanism comprises a reset rod, one end of the reset rod is fixedly installed on the push rod fixed plate, the other end of the reset rod is provided through the movable die plate, the reset rod is provided with an elastic element, and the elastic element is located between the movable die plate and the push rod fixed plate.

[0019] In order to make the round push rod and the flat push rod work more smoothly, a positioning block is arranged between the movable mold base plate and the push-out mechanism, the positioning block is fixedly installed on the movable mold base plate, and the positioning block is slidingly provided through the push plate and the push rod fixed plate.

[0020] The half assembly constitutes the cavity of the mold, so the cooling of the half assembly needs to be considered to control the temperature of the mold, therefore, the left cooling water channel is arranged on the left sliding block, and the right cooling water channel is arranged on the right sliding block. However, too many cooling water channels are not good, and factors such as product precision, forming cycle, processing difficulty and the like need to be considered. Since the product forming cycle is short, one cooling water channel is designed on each of the left and right sliding blocks, the water channel surrounds the shape of the sliding block structure, and the mold temperature can be effectively controlled between 32.5 and 33.6.

[0021] The beneficial effects of the present application are: the injection mold with the plastic part with the metal insert in the present application, in the design, since the plastic part is similar to a cylinder, the design is referenced from the common wheel type gate form, and two wheel type distribution channels are arranged. However, the gate injection position of the common wheel type gate is on the inner surface of the plastic part, and there will be gate marks, and for the plastic part, the inner surface size and appearance are required, and the gate marks are not allowed. Therefore, the gate injection position is improved, and is arranged at the end of the plastic part. Since the left cavity and the right cavity are combined to form the outer surface of the plastic part, the left gate is located directly above the left cavity, and the right gate is located directly above the right cavity, and the arrangement of the gate will not affect the inner surface and appearance of the plastic part. In the design of the core, since the shape of the plastic part is special, the core is designed as a combined structure in the present application, and the core includes a core I, a core II and a core III. Compared with the overall structure design of the core, the combined structure is easier to process, and the precision of the parts is easy to guarantee. Through the above core combined structure design, the feature structures such as the neck of the inner surface of the plastic part, the body of the inner surface of the plastic part and the tail of the inner surface of the plastic part are formed, and the plastic part is smoothly taken out after the mold is opened, the blade insert can be conveniently inserted into the core III before the mold is closed, and is accurately placed in the correct position. Since the plastic part is a long and thin round sleeve type deep cavity product, a half mechanism can be used to complete the molding of the outer surface of the plastic part and realize the demolding of the plastic part. When the mold is closed, the left slider and the right slider are combined to form the outer surface of the plastic part, and form the mold cavity together with the core. When the mold is opened, the left and right sliders are opened, and the plastic part is separated. The round push rod is distributed on both sides of the reinforcing rib of the body of the plastic part, and the action point is on the inner surface of the arc of the body of the plastic part. The top surfaces of a plurality of the round push rods are all in contact with the inner surface of the arc of the body of the plastic part. The end face shape of the flat push rod is the same as the cross section of the tail, and acts on each end face of the tail to push out the marks on the end face of the tail, without affecting the appearance quality. More importantly, the force of the round push rod on the plastic part can be reduced, and the deformation and damage of the plastic part at the action point of the push rod can be avoided. The flat push rod and the round push rod are fixed on the push rod seat, and the push rod seat is used to shorten the length of the push rod and improve the rigidity of the push rod. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in combination with the drawings and examples.

[0023] Figure 1 is a three-dimensional schematic view of the plastic part;

[0024] Figure 2 is a three-dimensional schematic view of the present application;

[0025] Figure 3 is a front view of the present application;

[0026] Figure 4 is a top view of the present application;

[0027] Figure 5 is a sectional view of A-A in the present application; Figure 4

[0028] ​Figure 6 is a sectional view at B-B in the present invention Figure 4

[0029] Figure 7 is a three-dimensional view of the present invention when the fixed die is not installed;

[0030] Figure 8 is a three-dimensional view of the present invention showing the relationship between the plastic part and the sprue;

[0031] Figure 9 is a three-dimensional view of the core in the present invention;

[0032] Figure 10 is a three-dimensional view of the steering valve in the present invention;

[0033] Figure 11 is a three-dimensional view of the core fixing plate in the present invention;

[0034] Figure 12 is a three-dimensional view of the left slider in the present invention;

[0035] Figure 13 is a three-dimensional view of the right slider in the present invention;

[0036] Figure 14 is a three-dimensional view of the movable die plate in the present invention;

[0037] Figure 15 is a three-dimensional view of the ejecting mechanism in the present invention;

[0038] Figure 16 is a three-dimensional assembly view of the round push rod, the flat push rod and the push rod seat in the present invention;

[0039] Figure 17 is a top view of the die in the present invention.

[0040] ​In the figure: 1. sprue bush, 1-1. main runner, 1-2. sub-runner, 2. cavity, 2-1. lower cavity, 3. core II, 4. core III, 4-1. upper section, 4-2. middle section, 4-3. lower section, 5. core I, 6. left slide, 6-1. left gate, 6-2. left cavity, 7. right slide, 7-1. right gate, 7-2. right cavity, 8. ejector seat, 9. round ejector pin, 10. flat ejector pin, 11. diverter valve, 11-1. first flow channel, 11-2. second flow channel, 11-3. third flow channel, 12. fixed die plate, 13. locating ring, 14. core retainer plate, 14-1. clamping guide slot, 14-2. through hole, 15. movable die plate, 16. spacer plate, 17. movable die plate, 17-1. left guide inclined hole, 17-2. right guide inclined hole, 18. left inclined guide pillar, 19. right inclined guide pillar, 20. stop block, 21. wear plate, 22. push plate, 23. guide plate, 24. ejector pin retainer plate, 25. transition plate, 26. guide bush, 27. guide pillar, 28. return lever, 29. elastic element, 30. locating block, 31. plastic part, 31-1. neck, 31-2. body, 31-3. tail, 32. insert blade. DETAILED DESCRIPTION

[0041] The present application will now be described in further detail with reference to the drawings. These drawings are simplified schematic illustrations of the basic structure of the present application and therefore only show the components relevant to the present application.

[0042] As Figures 2-17 shown in the figure, an injection mold for a plastic part with a metal insert includes a gating system, a movable die, a fixed die, a half mechanism, and an ejector mechanism,

[0043] The gating system comprises a sprue bush 1, and the sprue bush 1 is provided with a main runner 1-1 and a branch runner 1-2; the metal insert plastic part 31 used by the disposable sheath cutting and suturing device has multiple specifications, in order to save the manufacturing and processing cost of the mold, when the mold is designed, 12 specifications of product series are classified into 6 groups, each group has 2 specifications, the mold adopts one mold with two cavities layout, therefore, the branch runner 1-2 has two, and the two branch runners 1-2 are respectively located at two sides of the main runner 1-1, since each set of mold has two specifications of product cavities, in order to realize that two specifications of products can be processed at the same time or a certain specification of product can be processed alone during injection molding, the sprue bush 1 is provided with a diversion valve 11, the diversion valve 11 is provided with a first flow guide channel 11-1, a second flow guide channel 11-2 and a third flow guide channel 11-3 which are in communication with each other, the first flow guide channel 11-1 and the second flow guide channel 11-2 are located on the same straight line, and the third flow guide channel 11-3 is perpendicular to the straight line formed by the first flow guide channel 11-1 and the second flow guide channel 11-2. When the first flow guide channel 11-1 and the second flow guide channel 11-2 in the diversion valve 11 are respectively communicated with the two branch runners 1-2, the mold can simultaneously injection mold two specifications of products; when the third flow guide channel 11-3 is communicated with one of the branch runners 1-2, the mold of the application only injection molds the product formed by the cavity communicated with the branch runner 1-2; different branch runners can be selected according to the order needs. Here, taking the mold for molding two specifications of products 25 and 29 as an example. If the order of the factory only purchases the product with specification 25, the direction of the third flow guide channel 11-3 of the diversion valve 11 can be adjusted to face the cavity of the product with specification 25. At this time, the third flow guide channel 11-3 of the diversion valve 11 is butt-jointed with the branch runner 1-2 at the cavity of the product with specification 25, the branch runner 1-2 is connected, the molten plastic can flow into the cavity of the product with specification 25 through the main runner 1-1 and the branch runner 1-2 under a certain pressure, and the product is formed, while the other branch runner 1-2 is not connected, the molten plastic cannot flow into the cavity of the product with specification 29, and the product with specification 29 cannot be injection molded. Similarly, if the factory needs the product with specification 29, the third flow guide channel 11-3 is directed to the cavity of the product with specification 29. If the order of the factory purchases both the product with specification 25 and the product with specification 29, the first flow guide channel 11-1 and the second flow guide channel 11-2 of the diversion valve 11 can be respectively communicated with the two branch runners 1-2, and the two products can be molded at the same time.

[0044] The moving mold is located below the fixed mold. The moving mold includes a cavity 2 with a lower cavity 2-1. Core II 3 and core III 4 are fixedly installed on the cavity 2. Core III 4 is coaxially sleeved outside core II 3. Core II 3 protrudes from core III 4. Core III 4 is coaxially arranged with the lower cavity 2-1. Core III 4 is divided into an upper section 4-1, a middle section 4-2, and a lower section 4-3. The moving mold also includes a moving mold base plate 15, a pad 16, and a moving template 17. The moving template 17 is fixedly installed on the moving mold base plate 15 through the pad 16. The cavity 2 is fixedly installed on the moving template 17. The left slider 6 and the right slider 7 are both slidably arranged on the moving template 17.

[0045] The gating system is fixedly installed on the fixed mold, which is provided with runners 1-2. The fixed mold includes core I5, which passes through the runners 1-2 and is in coaxial contact with core II3. The fixed mold also includes a fixed mold base plate 12, a positioning ring 13, and a core fixing plate 14. The positioning ring 13 is detachably installed on the upper surface of the fixed mold base plate 12, and the core fixing plate 14 is fixedly installed on the lower surface of the fixed mold base plate 12. The lower surface of the core fixing plate 14 has a mold closing guide groove 14-1 for accommodating the left slider 6 and the right slider 7. The bottom of the mold closing guide groove 14-1 has a through hole 14-2 for accommodating the directional valve 11. The runners 1-2 are opened on the core fixing plate 14 and are located on both sides of the through hole 14-2. Core I5 ​​is fixedly installed on the core fixing plate 14 and passes through the runners 1-2 and fits against core II3.

[0046] The mold core adopts a modular structure, composed of three parts: core I5, core II, and core III. Taking product specification 29 as an example, core I5 ​​forms the smooth section of the neck 31-1, core II3 forms the serrated section of the neck 31-1, and core III4 is divided into upper, middle, and lower sections. The upper section 4-1 forms the body 31-2 of the plastic part 31, and the middle section 4-2 is used to precisely position the inner hole of the blade. The core diameter is 28.25mm, and the clearance between the inner hole of the blade and the core is 0.02-0.04mm. This clearance ensures that the operator can easily insert the insert blade 32 into the core, while ensuring the coaxiality accuracy of the insert blade 32 and the plastic part 31. The lower section 4-3 of core III4 has a diameter of φ29mm, slightly larger than the inner hole size of the blade, thus determining the blade placement height at the middle section 4-2. The lower section 4-3 of the core is interference-fitted with the cavity mold 2, securing the core Ⅲ4 to the cavity mold 2, while the core Ⅱ3 is embedded in the core Ⅲ4. Compared with the overall core structure design, this combined structure is easier to process and the precision of the parts is easier to guarantee. Through the above core combination structure design, the characteristic structures such as the neck 31-1, body 31-2, and tail 31-3 on the inner surface of the plastic part 31 are formed. At the same time, it enables the smooth removal of the plastic part 31 after mold opening, and the blade insert can be easily inserted into the core Ⅲ4 and accurately placed in the correct position before mold closing.

[0047] The half mechanism is located between the fixed mold and the movable mold, and comprises a left sliding block 6 and a right sliding block 7. The left sliding block 6 is slidingly arranged in a left guide sliding groove, and the right sliding block 7 is slidingly arranged in a right guide sliding groove. The left sliding block 6 and the right sliding block 7 are directly related to the appearance of the plastic part 31. Therefore, the left sliding block 6 and the right sliding block 7 are provided with inclined positioning steps. When the mold is closed, the inclined wedge mechanism is locked under the action of the locking force of the injection molding machine, and the positioning steps are engaged with each other. Since the steps are inclined, the gap at the joint is zero, and the joint mark defect of the half sliding block of the plastic part 31 is reliably avoided.

[0048] The left sliding block 6 is provided with a left gate 6-1 and a left cavity 6-2 which are in communication with each other. The left gate 6-1 is located directly above the left cavity 6-2, and the left gate 6-1 is in communication with the runner 1-2. The right sliding block 7 is provided with a right gate 7-1 and a right cavity 7-2 which are in communication with each other. The right gate 7-1 is located directly above the right cavity 7-2, and the right gate 7-1 is in communication with the runner 1-2. The plastic part 31 is similar to a cylindrical shape, and the design is inspired by the common wheel gate form. Two wheel runners 1-2 are arranged. However, the wheel gate injection position is usually on the inner surface of the plastic part 31, which will have gate marks. For the plastic part 31, the inner surface size and appearance are required, and gate marks are not allowed. Therefore, the gate injection position is improved, and the gate is arranged at the end of the plastic part 31. The side of the gate has an arc, which is inverted triangular, and the upper and lower cross-sectional dimensions are 7.5mm 2 , 0.6mm 2 . Different upper and lower cross-sectional dimensions will produce a large injection pressure difference, which can reduce the melt viscosity of the plastic part 31 and increase the flowability, which is beneficial to the cavity filling. Since the small end of the gate is only 0.6mm 2 , the gate mark will be small, and the appearance quality is improved.

[0049] The half mechanism further comprises a left inclined guide pillar 18, a right inclined guide pillar 19, a stopper 20 and a wear plate 21. The left inclined guide pillar 18 and the right inclined guide pillar 19 are both fixedly installed on the core fixing plate 14. The movable die plate 17 is provided with a left guide inclined hole 17-1 and a right guide inclined hole 17-2. One end of the left inclined guide pillar 18 is inserted into the left guide inclined hole 17-1 after penetrating through the left sliding block 6. One end of the right inclined guide pillar 19 is inserted into the right guide inclined hole 17-2 after penetrating through the right sliding block 7. The two stoppers 20 are both fixedly installed on the movable die plate 17 and are respectively located on the side of the left sliding block 6 and the right sliding block 7, so as to limit the left sliding block 6 and the right sliding block 7 from excessively moving out of the movable die plate 17. The two wear plates 21 are both fixedly installed on the left sliding block 6 and the right sliding block 7 and are respectively in contact with the guide surface of the clamping guide groove 14-1 during clamping. The half assembly constitutes the cavity of the mold, so the cooling of the half assembly needs to be considered to control the temperature of the mold. Therefore, the left cooling water channel is provided on the left sliding block 6 and the right cooling water channel is provided on the right sliding block 7. However, the more the cooling water channels are, the better. The product precision, the forming cycle, the processing difficulty and other factors need to be comprehensively considered. Since the product forming cycle is short, one cooling water channel is designed on each of the left and right sliding blocks 7. The water channel surrounds the structure shape of the sliding block and can effectively control the mold temperature to be between 32.5 and 33.6.

[0050] The push-out mechanism comprises a push rod seat 8, a round push rod 9 and a flat push rod 10 fixedly installed on the push rod seat 8, a plurality of round push rods 9 are circumferentially distributed along the central axis of the plastic part 31, the action points of the plurality of round push rods 9 are all on the inner arc surface of the body 31-2 of the plastic part 31, and the top surfaces of the plurality of round push rods 9 are all in close contact with the inner arc surface of the body 31-2 of the plastic part 31; the number of the flat push rods 10 is equal to the number of the tail 31-3 of the plastic part 31, a plurality of flat push rods 10 are arranged one by one corresponding to a plurality of tail 31-3, and the end face shape of the flat push rod 10 is the same as the cross section of the tail 31-3. The push-out mechanism comprises a push plate 22 and a guide plate 23, the push plate 22 is located between the two backing plates 16, the push plate 22 is fixedly installed with a push rod fixed plate 24, the push rod seat 8 is fixedly installed on the push rod fixed plate 24, the push rod seat 8 is fixedly installed with a transition plate 25, the guide plate 23 is fixedly installed below the die 2 on the movable die plate 17, and the round push rod 9 and the flat push rod 10 are sequentially arranged through the transition plate 25 and the guide plate 23. Considering that the plastic part 31 has a large length-diameter ratio, especially the head and neck, the length-diameter ratio reaches 4, and a plurality of rib plates are distributed, when forming and cooling, a great holding force is generated on the core, which is the greatest resistance for demolding the plastic part 31. Therefore, the round push rod 9 is designed to push out the element, which is distributed on both sides of the rib of the body 31-2, has a diameter of 3 mm, a total of 8 is uniformly distributed, the action point is on the inner arc surface of the body 31-2 of the plastic part 31, and the top surface of the plurality of round push rods 9 is in close contact with the inner arc surface of the body 31-2 of the plastic part 31. At the same time, the tail 31-3 of the plastic part 31 is formed in the lower core, since the tail 31-3 is flat and has 20 circumferential directions, a greater demolding resistance is generated. Therefore, the flat push rod 10 is designed. The end face shape of the flat push rod 10 is the same as the cross section of the tail 31-3, acts on the end face of each tail 31-3, and leaves a trace on the end face of the tail 31-3, which does not affect the appearance quality, and more importantly, can reduce the force of the round push rod 9 on the plastic part 31, and avoid deformation and damage of the plastic part 31 at the action point of the push rod. The push rod seat 8 is arranged, the flat push rod 10 and the round push rod 9 are fixed on the push rod seat 8, the push rod seat 8 is tightly connected with the push rod fixed plate 24 and the push plate 22, so as to shorten the length of the push rod, improve the rigidity of the push rod, in order to improve the stability of the push-out, the guide plate 23 is arranged, the flat push rod 10 and the round push rod 9 pass through the corresponding guide plate 23 holes, the cooperation gap between them is 0-0.01 mm, the slow wire is clamped and processed once, the gap value of each flat push rod 10 and the guide plate 23 is ensured to be the same, so that the plastic part 31 is pushed out more stably when the plastic part 31 is pushed out.

[0051] A guide assembly is further arranged between the fixed die and the movable die, the guide assembly comprises a guide sleeve 26 and a guide column 27, the guide sleeve 26 is fixedly installed on the core fixed plate 14, and the guide column 27 is fixedly installed on the movable die plate 17 and coaxially and slidingly inserted into the guide sleeve 26.

[0052] The elastic reset mechanism is arranged between the push-out mechanism and the movable die, and comprises a reset rod 28, one end of which is fixedly installed on the push rod fixed plate 24, and the other end penetrates the movable die plate 17, and the reset rod 28 is sleeved with an elastic element 29, which is located between the movable die plate 17 and the push rod fixed plate 24, and the elastic element is a compression spring.

[0053] The positioning block 30 is fixedly installed on the movable die base plate 15, and slides through the push plate 22 and the push rod fixed plate 24.

[0054] The injection mold of the metal insert plastic part of the present application, in operation, installs the mold of the present application on the vertical injection machine to complete the whole forming cycle from injection molding to taking out the plastic part 31 and placing the insert, therefore selects the vertical injection machine of 125 gram specification according to the total injection amount required by the molded plastic part 31, and reforms the workbench of the injection machine to have two work stations: the workpiece taking and placing work station and the injection molding work station. According to the order specification, selects the direction of the steering valve 11, and installs the mold on the injection machine. In the mold opening state, the insert can be conveniently inserted into the core and placed in the designated step position, the mold is closed, the left cavity 6-2 and the right cavity 7-2 are closed to surround the core I 5, the core II 3 and the core III 4 to form the upper cavity, the upper cavity is communicated with the lower cavity 2-1, the core I 5 forms the smooth section of the bucket neck 31-1, the core II 3 forms the jagged section of the bucket neck 31-1, the upper section 4-1 of the core III 4 forms the bucket body 31-2 of the plastic part 31, the middle section 4-2 is used for accurately positioning the inner hole of the blade, and the lower section 4-3 is used for determining the height of the blade at the middle section 4-2; the left cavity 6-2 and the right cavity 7-2 are combined to form the outer surface of the plastic part 31; the lower cavity 2-1 is used for forming the bucket tail 31-3 of the plastic part 31 to complete the injection molding process. When the mold is opened, first, the fixed mold part moves upward, the left slider 6 is driven by the left inclined guide pillar 18 to move along the left guide sliding groove, the right slider 7 moves along the right guide sliding groove, the left slider 6 and the right slider 7 move away from each other until the left slider 6 and the right slider 7 hit the stopper 20, at this time, the condensed material and the plastic part 31 are completely separated from the sliders, the ejection mechanism composed of the push plate 22, the push rod fixed plate 24 and the push rod seat 8 completes the ejection action of the round push rod 9 and the flat push rod 10 under the action of the mold opening and closing system of the injection machine to safely take out the condensed material and the plastic part 31, and completes a forming cycle. The injection molding cycle of the product is 40 seconds in total, and the time of each link is set as: 3 seconds for injection molding, 2 seconds for mold opening, 2 seconds for taking out the plastic part 31, 3 seconds for placing the insert, 30 seconds for the movement time of the two work stations, and the production rhythm is very fast. Moreover, the mold opening and closing space of the mold is small, and the pressure during mold closing is above 50 Mpa. If a general one-station vertical injection machine is used to complete the whole forming cycle, it is neither convenient nor safe for taking out the plastic part 31 and placing the insert. Through the reform of the workbench of the injection machine, the plastic part 31 can be conveniently taken out from the lower mold of the mold at the a work station in the set time, the insert can be safely inserted into the core and placed at the designated position, and then the lower mold of the mold is automatically moved to the b work station according to the set time to complete the mold closing and injection molding.

[0055] In the design, since the plastic part 31 is similar to a cylinder, the design is inspired by the common wheel type gate form, and two wheel type distribution channels 1-2 are arranged. However, the gate injection position of the common wheel type gate is on the inner surface of the plastic part 31, and there will be gate marks. For the plastic part 31, the inner surface size and appearance are required, and the gate marks are not allowed. Therefore, the gate injection position is improved and arranged at the end of the plastic part 31. Since the left cavity 6-2 and the right cavity 7-2 are combined to form the outer surface of the plastic part 31, the left gate 6-1 is located directly above the left cavity 6-2, and the right gate 7-1 is located directly above the right cavity 7-2. The arrangement of the gate will not affect the inner surface and appearance of the plastic part 31. In the design of the core, since the shape of the plastic part 31 is special, the core is designed as a combined structure in the application, and the core includes core I 5, core II 3 and core III 4. Compared with the overall structure design of the core, the combined structure is easier to process, and the precision of the parts is easy to guarantee. Through the above core combined structure design, the characteristic structures such as the neck 31-1, the body 31-2 and the tail 31-3 of the inner surface of the plastic part 31 are formed, and the plastic part 31 is smoothly taken out after the mold is opened. Before the mold is closed, the blade insert can conveniently penetrate into the core III 4 and be accurately placed in the correct position. Since the plastic part 31 is an elongated round sleeve type deep cavity product, a half mechanism can be used to complete the molding of the outer surface of the plastic part 31 and realize the demolding of the plastic part 31. When the mold is closed, the left slider 6 and the right slider 7 are combined to form the outer surface of the plastic part 31, and the core forms the mold cavity. When the mold is opened, the left and right sliders 7 are opened and the plastic part 31 is separated. The round push rod 9 is distributed on both sides of the rib of the body 31-2, and the action point is on the inner surface of the arc of the body 31-2. The top surfaces of a plurality of said round push rods are in contact with the inner surface of the arc of the body 31-2. The end face shape of the flat push rod 10 is the same as the cross section of the tail 31-3, and it acts on the end face of each tail 31-3. The push-out mark is left on the end face of the tail 31-3, which does not affect the appearance quality, and more importantly, it can reduce the force of the round push rod 9 on the plastic part 31, avoid deformation and damage of the plastic part 31 at the action point of the push rod, and improve the rigidity of the push rod.

[0056] Based on the above ideal embodiments according to the application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. An injection mold with a metal insert plastic part, characterized in that: include: Gating system: The gating system includes a gating sleeve (1), on which a main runner (1-1) is provided; Moving mold: The moving mold is located below the fixed mold. The moving mold includes a cavity mold (2). The cavity mold (2) has a lower cavity (2-1). Core II (3) and core III (4) are fixedly installed on the cavity mold (2). Core III (4) is coaxially sleeved outside core II (3). Core II (3) protrudes from core III (4). Core III (4) is coaxially arranged with the lower cavity (2-1). Core III (4) is divided into an upper section (4-1), a middle section (4-2) and a lower section (4-3). The upper section (4-1) forms the body (31-2) of the plastic part (31). The middle section (4-2) is used to accurately position the inner hole of the blade. The lower section (4-3) is interference-fitted with the cavity mold (2). Fixed mold: The gating system is fixedly installed on the fixed mold, which is provided with a runner (1-2). The fixed mold includes a core I (5), which passes through the runner (1-2) and is coaxially contacted with a core II (3). The core I (5) forms the smooth section of the neck (31-1), and the core II (3) forms the serrated section of the neck (31-1). Half-slide mechanism: The half-slide mechanism is located between the fixed mold and the moving mold. The half-slide mechanism includes a left slide block (6) and a right slide block (7). The left slide block (6) has a left gate (6-1) and a left cavity (6-2) that are connected to each other. The left gate (6-1) is located directly above the left cavity (6-2). The left gate (6-1) is connected to the runner (1-2). The right slide block (7) has a right gate (7-1) and a right cavity (7-2) that are connected to each other. The right gate (7-1) is located directly above the right cavity (7-2). The right gate (7-1) is connected to the runner (1-2). When the mold is closed, the left cavity (6-2) and the right cavity (7-2) close and surround the core I (5), core II (3) and core III (4) to form the upper cavity. The upper cavity is connected to the lower cavity (2-1). Core I (5) forms the smooth section of the neck (31-1), core II (3) forms the serrated section of the neck (31-1), the upper section (4-1) of core III (4) forms the body (31-2) of the plastic part (31), the middle section (4-2) is used to accurately position the inner hole of the blade, and the lower section (4-3) is used to determine the height of the blade in the middle section (4-2). The left cavity (6-2) and the right cavity (7-2) are assembled to form the outer surface of the plastic part (31). The lower cavity (2-1) is used to form the tail (31-3) of the plastic part (31). The ejection mechanism includes a push rod seat (8), on which round push rods (9) and flat push rods (10) are fixedly installed. A plurality of round push rods (9) are evenly distributed around the central axis of the plastic part (31). The action points of the plurality of round push rods (9) are all on the inner surface of the arc of the bucket body (31-2) of the plastic part (31). The top surface of the plurality of round push rods (9) is in contact with the inner surface of the arc of the bucket body (31-2) of the plastic part (31). The number of flat push rods (10) is equal to the number of bucket tails (31-3) of the plastic part (31). The plurality of flat push rods (10) are arranged in a one-to-one correspondence with the plurality of bucket tails (31-3). The end face shape of the flat push rod (10) is the same as the cross-section of the bucket tail (31-3).

2. The injection mold for a plastic part with metal inserts as described in claim 1, characterized in that: The flow channel (1-2) has two channels, which are located on both sides of the main flow channel (1-1). The gate sleeve (1) is fitted with a diverting valve (11). The diverting valve (11) has a first flow guide channel (11-1), a second flow guide channel (11-2), and a third flow guide channel (11-3) that are interconnected. The first flow guide channel (11-1) and the second flow guide channel (11-2) are located on the same straight line. The third flow guide channel (11-3) perpendicularly bisects the straight line formed by the first flow guide channel (11-1) and the second flow guide channel (11-2).

3. The injection mold for a plastic part with metal inserts as described in claim 1, characterized in that: The fixed mold also includes a fixed mold base plate (12), a positioning ring (13), and a core fixing plate (14). The positioning ring (13) is detachably installed on the upper surface of the fixed mold base plate (12). The core fixing plate (14) is fixedly installed on the lower surface of the fixed mold base plate (12). The lower surface of the core fixing plate (14) is provided with a mold closing guide groove (14-1) for accommodating the left slider (6) and the right slider (7). The bottom of the mold closing guide groove (14-1) is provided with a through hole (14-2) for accommodating the steering valve (11). The flow channel (1-2) is opened on the core fixing plate (14) and located on both sides of the through hole (14-2). The core I (5) is fixedly installed on the core fixing plate (14). After passing through the flow channel (1-2), the core I (5) fits against the core II (3).

4. The injection mold for a plastic part with metal inserts as described in claim 3, characterized in that: The moving mold also includes a moving mold base plate (15), a pad plate (16) and a moving template (17). The moving template (17) is fixedly installed on the moving mold base plate (15) through the pad plate (16). The die (2) is fixedly installed on the moving template (17). The left slider (6) and the right slider (7) are both slidably arranged on the moving template (17).

5. The injection mold for a plastic part with metal inserts as described in claim 4, characterized in that: The half-mechanism also includes a left oblique guide post (18), a right oblique guide post (19), a stop block (20), and a wear-resistant plate (21). The left oblique guide post (18) and the right oblique guide post (19) are both fixedly installed on the core fixing plate (14). The moving template (17) is provided with a left guide oblique hole (17-1) and a right guide oblique hole (17-2). One end of the left oblique guide post (18) passes through the left slider (6) and is inserted into the left guide oblique hole (17-1); one end of the right oblique guide post (19) passes through the right slider (7) and is inserted into the left guide oblique hole (17-1). Inserted into the right guide oblique hole (17-2), the two stops (20) are fixedly installed on the moving template (17). The two stops (20) are located on the side where the left slider (6) and the right slider (7) are respectively, and are used to limit the left slider (6) and the right slider (7) from moving out of the moving template (17) excessively. The two wear-resistant plates (21) are fixedly installed on the left slider (6) and the right slider (7) respectively. When the mold is closed, the two wear-resistant plates (21) are respectively in contact with the guide surface of the mold closing guide groove (14-1).

6. The injection mold for a plastic part with metal inserts as described in claim 4, characterized in that: The ejection mechanism includes a push plate (22) and a guide plate (23). The push plate (22) is located between the two pads (16). A push rod fixing plate (24) is fixedly installed on the push plate (22). The push rod seat (8) is fixedly installed on the push rod fixing plate (24). A transition plate (25) is fixedly installed on the push rod seat (8). The guide plate (23) is fixedly installed below the upper die (2) of the moving template (17). The round push rod (9) and the flat push rod (10) are both sequentially passed through the transition plate (25) and the guide plate (23).

7. The injection mold for a plastic part with metal inserts as described in claim 4, characterized in that: A guide assembly is also provided between the fixed mold and the moving mold. The guide assembly includes a guide sleeve (26) and a guide post (27). The guide sleeve (26) is fixedly installed on the core fixing plate (14), and the guide post (27) is fixedly installed on the moving template (17). The guide post (27) is coaxially slidably inserted into the guide sleeve (26).

8. The injection mold for a plastic part with metal inserts as described in claim 6, characterized in that: An elastic reset mechanism is also provided between the ejection mechanism and the moving mold. The elastic reset mechanism includes a reset rod (28). One end of the reset rod (28) is fixedly installed on the push rod fixing plate (24), and the other end passes through the moving template (17). An elastic element (29) is provided on the outer sleeve of the reset rod (28). The elastic element (29) is located between the moving template (17) and the push rod fixing plate (24).

9. The injection mold for a plastic part with metal inserts as described in claim 6, characterized in that: A positioning block (30) is provided between the moving mold base plate (15) and the ejection mechanism. The positioning block (30) is fixedly installed on the moving mold base plate (15) and slides through the push plate (22) and the push rod fixing plate (24).

10. The injection mold for a plastic part with metal inserts as described in claim 1, characterized in that: The left slider (6) has a left cooling water passage, and the right slider (7) has a right cooling water passage.

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