An injection mold for manufacturing a product with a tubular body component

Abstract

The present invention relates to an injection mold for manufacturing a product having a tubular body component, which comprises, from top to bottom, an upper panel, a front template, a rear template, and a lower panel; the front template corresponds to the rear template; the mold further comprises a sprue cutter device and a pull pin; a female mold core is fixedly provided on the front template; a male mold core is provided on the rear template; a sprue sleeve is fixedly provided on the upper panel; a guide sleeve is fixedly provided on the female mold core; the sprue cutter device comprises a tubular cutter; the pull pin is slidably arranged in the tubular cutter, the upper end of the pull pin being a material pulling portion; the tubular cutter passes through the rear template and the male mold core in sequence and faces the guide sleeve; the upper end of the tubular cutter is a cutting portion; after the mold is closed, the lower end surface of the guide sleeve, the portion of the tubular cutter extending from the male mold core, and the portions of the two corresponding to the female mold core form a forming cavity having the upper tubular body of the tubular body component product. The present invention allows the tubular cutter, which acts as a sprue cutter, to participate in forming while also performing sprue removal, thereby changing the traditional feeding method and effectively avoiding the problem of product weld marks.

Description

Technical Field

[0001] The invention relates to the field of injection molding, in particular to an injection mold for manufacturing products with pipe body components. Background Art

[0002] Injection molds are tools for producing plastic products; they are also tools that give plastic products complete structures and precise dimensions. Injection molding is a processing method used in the mass production of certain complex-shaped parts. Specifically, it refers to the process of injecting heated and molten plastic into the mold cavity under high pressure by the injection molding machine, and then cooling and solidifying to obtain the molded product.

[0003] In injection molding, latent injection, hot runner injection, and small gate injection all create a confluence point, which typically results in a weld mark. Weld marks occur when several streams of material diverge and converge in the mold during injection or extrusion, resulting in incomplete fusion at the interface and a failure to fuse together. This creates a weld mark, which impacts the appearance quality and mechanical properties of the plastic part. Furthermore, some injection molds that use gate cutters have complex designs and limited functionality, requiring improvement. Summary of the Invention

[0004] The first purpose of the present invention is to provide an injection mold for manufacturing products with tubular body parts, which allows the tubular cutter as a nozzle cutter to participate in the forming while also being able to perform nozzle cutting, thereby changing the traditional feeding method and effectively avoiding the problem of product weld marks.

[0005] The technical solution for achieving the first purpose of the present invention is: the present invention includes an upper panel, a front template, a rear template and a lower panel from top to bottom; the front template corresponds to the rear template; it also has a sprue cutter device and a pulling needle; the front template is fixed with a female mold core; the rear template is provided with a male mold core; a sprue sleeve is fixed on the upper panel; a guide sleeve for inserting the sprue sleeve is fixed on the female mold core; the sprue cutter device includes a tubular cutter for sprue cutting driven by a cutter driving device; the pulling needle is slidably arranged in the tubular cutter, and the upper end of the pulling needle is the pulling part; the tubular cutter passes through the rear template and the male mold core in turn, and faces the guide sleeve; the tubular cutter slides with the rear template and the male mold core; the upper end of the tubular cutter is the cutting part; after the mold is closed, the lower end surface of the guide sleeve, the part of the tubular cutter extending out of the male mold core, and the parts of the two corresponding to the female mold core form a forming cavity with a tube body on the tube body product.

[0006] It also includes a movable insert mechanism; the movable insert mechanism includes two symmetrically arranged insert assemblies; the insert assembly includes an insert, an inclined rod and a driving block; the insert is slidably arranged on the female mold core, and its end extending into the interior of the female mold core is a forming part, and the other end is provided with an inclined hole that cooperates with the inclined rod; the inclined rod is arranged on the driving block, and the driving block is fixedly arranged on the upper panel; the front template is provided with a first spring group for driving the upper panel to separate from the front template; after the mold is closed, the forming part of the insert, the lower end face of the guide sleeve, and the part of the tubular cutter extending out of the male mold core form a forming cavity with an upper tube body of the tube body component product.

[0007] The rear template is provided with a core-pulling mechanism; the core-pulling mechanism includes a core shaft driven by a core-pulling driving device and participating in the forming.

[0008] The pulling portion of the pulling needle is a block with an inclined surface; the inclined surface extends outward from top to bottom and tilts; the pulling portion is located inside the tubular cutter and forms a filling cavity with the tubular cutter.

[0009] The diameter of the portion of the tubular cutter extending out of the male mold core gradually increases from top to bottom.

[0010] It also has an ejector assembly; the ejector assembly includes an ejector plate and multiple ejectors; multiple return rods are fixedly provided on the lower end surface of the rear template, and a second return spring is sleeved on the return rod; the ejector plate is slidably arranged on the return rod, and the two ends of the second return spring act on the lower end surface of the rear template and the upper end surface of the ejector plate respectively; the lower panel is provided with a through hole for the ejector rod of the injection molding machine to pass through; the ejectors are all fixedly arranged on the ejector plate, and each ejector acts on the inner wall and / or connecting hole and / or reinforcing rib of the product with a tubular body component.

[0011] The surface roughness of the tubular cutter is less than or equal to Ra0.4.

[0012] The above-mentioned cutter drive device includes a cutter seat and a high-pressure micro-motion cylinder; the lower end of the tubular cutter extends from the rear template and is fixedly connected to the cutter seat, and the lower end of the pull needle extends from the lower end of the tubular cutter, passes through the cutter seat and is fixedly connected to the ejector plate; the core pulling drive device is a cylinder, and the telescopic part of the cylinder is fixedly connected to the core shaft.

[0013] The present invention has positive effects: (1) The tubular cutter in the present invention can not only participate in forming, but also perform nozzle cutting, thus changing the traditional feeding method. It does not have the problem of glue aggregation, thus effectively avoiding the problem of product welding marks.

[0014] (2) The present invention can adapt to some pipe forming requirements through the movable insert mechanism, which is convenient for forming and demoulding, such as the forming of the water inlet pipe in the water pump housing.

[0015] (3) The present invention can further enable the mold to be suitable for more forming requirements through the core pulling mechanism.

[0016] (4) The coordinated design of the material pulling part and the tubular cutter in the present invention is very clever, which provides favorable conditions for the tubular cutter to participate in the forming. At the same time, the block design structure of the material pulling part is simple, but its inclined surface design makes the material pulling effect better and makes it more convenient to remove the material head.

[0017] (5) The design of the ejector assembly in the present invention can make the appearance of the product with the tube body component more beautiful.

[0018] (6) The surface roughness of the tubular cutter in the present invention further affects the demoulding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 is a cross-sectional view of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the female mold core, male mold core, nozzle cutter device, pull pin, movable insert mechanism and ejector pin assembly in the present invention;

[0023] Figure 4 for Figure 3 sectional view of

[0024] Figure 5 Schematic diagram of the structure of the movable insert assembly in the present invention;

[0025] Figure 6 Schematic diagram of the cooperation between the drawing portion of the drawing needle and the cutting portion of the tubular cutter in the present invention;

[0026] Figure 7 Schematic diagram of the structure of the mother mold core in the present invention;

[0027] Figure 8 This is a schematic diagram of the installation of the male mold core, core pulling mechanism, nozzle cutter device, pull pin and ejector pin assembly in the present invention. DETAILED DESCRIPTION

[0028] See Figures 1 to 8The present invention includes an upper panel 1, a front template 2, a rear template 3 and a lower panel 4 from top to bottom; the front template 2 corresponds to the rear template 3; it also has a sprue cutter device, a pulling needle 6, a movable insert mechanism, a core pulling mechanism and an ejector assembly 9; the front template 2 is fixed with a female mold core 21; the rear template 3 is provided with a male mold core 31; the upper panel 1 is fixed with a gate sleeve 11; the female mold core 21 is fixed with a guide sleeve 211 for inserting the gate sleeve 11; the sprue cutter device includes a tubular cutter 5 for performing sprue cutting under the drive of a cutter drive device; the pulling needle 6 is slidably arranged in the tubular cutter 5, and the upper end of the pulling needle 6 is a pulling portion 61; the tubular cutter 5 passes through the rear template 3 and the male mold core 31 in turn, and faces the guide sleeve 211; the tubular cutter 5 slides with the rear template 3 and the male mold core 31; the upper end of the tubular cutter 5 is a cutting portion 51.

[0029] The movable insert mechanism includes two symmetrically arranged insert assemblies 7; the insert assembly 7 includes an insert 71, an inclined rod 72 and a driving block 73; the insert 71 is slidably arranged on the female mold core 21, and its end extending into the interior of the female mold core 21 is a forming part 711, and the other end is provided with an inclined hole 712 cooperating with the inclined rod 72; the inclined rod 72 is arranged on the driving block 73, and the driving block 73 is fixedly arranged on the upper panel 1; the front template 2 is provided with a first spring group for driving the upper panel 1 to separate from the front template 2; after the mold is closed, the forming part 711 of the insert 71, the lower end surface of the guide sleeve 211, and the part of the tubular cutter 5 extending out of the male mold core 31 form a forming cavity with an upper tube body of the tube body component product.

[0030] The driving block 73 is provided with a locking guide bevel 731; the insert 71 is provided with a matching bevel 713 that cooperates with the locking guide bevel 731 and is used to cause the insert 71 to slide inward; when the mold is closed, the locking guide bevel 731 further causes the forming parts of the two inserts 71 to move toward each other and participate in the forming.

[0031] The rear template 3 is provided with a core pulling mechanism; the core pulling mechanism includes a core shaft 8 driven by a core pulling drive device to participate in the forming; the core pulling drive device is a cylinder, and the telescopic part of the cylinder is fixedly connected to the core shaft 8.

[0032] The pulling portion 61 of the pulling needle 6 is a block with an inclined surface; the inclined surface extends outward from top to bottom and tilts; the pulling portion 61 is located inside the tubular cutter 5 and forms a filling cavity with the tubular cutter 5.

[0033] The diameter of the portion of the tubular cutter 5 extending out of the male mold core 31 gradually increases from top to bottom. This design makes demoulding easier.

[0034] The ejector assembly 9 includes an ejector plate 91 and multiple ejector pins 92. Multiple return rods are fixedly mounted on the lower end surface of the rear template 3, each of which is sleeved with a second return spring. The ejector plate 91 is slidably mounted on the return rods, with the two ends of the second return spring acting on the lower end surface of the rear template 3 and the upper end surface of the ejector plate 91, respectively. The lower panel 4 is provided with a through hole for the ejector pin of the injection molding machine to pass through. The ejector pin passes through the through hole of the lower panel 4 and acts on the ejector plate 91. The ejector pins 92 are each fixedly mounted on the ejector plate 91, and each ejector pin 92 acts on the inner wall and / or connection hole and / or reinforcement rib of the product having a tubular body. The ejector pin of the injection molding machine cooperates with a driving cylinder. Driven by the driving cylinder, the ejector pin acts on the ejector pin 91, thereby prompting the ejector pin 92 to eject the material.

[0035] The surface roughness of the tubular cutter 5 is less than or equal to Ra0.4.

[0036] The cutter drive device includes a cutter seat and a high-pressure micro-motion cylinder; the lower end of the tubular cutter 5 extends from the rear template 3 and is fixedly connected to the cutter seat; the lower panel 4 and the ejector plate 91 are both provided with through holes for the drive shaft of the high-pressure micro-motion cylinder to pass through, and the drive shaft of the high-pressure micro-motion cylinder passes through the lower panel 4 and the ejector plate 91 in turn and is fixedly connected to the cutter seat; the lower end of the pull needle 6 extends from the lower end of the tubular cutter 5, passes through the cutter seat and is fixedly connected to the ejector plate 91; the core pulling drive device is a cylinder, and the telescopic part of the cylinder is fixedly connected to the core shaft.

[0037] Take the injection molding of water pump housing as an example, and Figures 1 to 8 These are all injection molds for water pump housings:

[0038] The forming portion 711 of the insert 71, the lower end surface of the guide sleeve 211, and the portion of the tubular cutter 5 extending from the male mold core 31 form the forming cavity for the water pump housing's water inlet pipe (the water inlet pipe is the tube body). The male mold core 31 on the rear mold plate 3 cooperates with the female mold core 21 on the front mold plate 2 to form the main body of the water pump housing (i.e., the portion for mounting the impeller). The female mold core 21, male mold core 31, and core shaft 8 cooperate to form the forming cavity for the water pump housing's water outlet pipe. The ejector pins 92 of the ejector pin assembly 9 slidably engage the rear mold plate 3 and male mold core 31, and each ejector pin 92 of the ejector pin assembly 9 acts within the connection hole inside the water pump housing.

[0039] The working process of preparing the water pump housing using the above injection mold is as follows:

[0040] First, the mold is closed. After closing, the two symmetrically arranged inserts 71, driven by the locking guide bevels 731 and the inclined rod 72 of their drive block 73, move toward each other. Finally, together with the lower end surface of the guide sleeve 211 and the portion of the tubular cutter 5 extending from the male mold core 31, they form the forming cavity for the water pump housing's water inlet pipe. The sprue bushing 11 is inserted into the guide sleeve 211, preparing for injection molding. Simultaneously, the core-pulling drive mechanism drives the mandrel 8 to engage the male mold core 31 on the rear mold plate 3, preparing for molding. Simultaneously, the tubular cutter 5, driven by the cutter drive mechanism, reaches its predetermined position and prepares for molding. Simultaneously, the pull pin 6 also reaches its predetermined position, driven by the mold closing mechanism.

[0041] At the beginning of injection molding, the molten plastic flows into the molding cavity from the sprue bushing 11. Since the molten plastic flows evenly and there is no plastic confluence position, welding marks are eliminated.

[0042] After the pressure holding is completed, the cutting portion 51 of the tubular cutter 5 is driven by the cutter driving device to cut off the sprue, and the sprue head is fixed by the pulling needle 6. The core shaft 8 before the mold is opened is now driven by the core pulling driving device to exit the forming cavity. Then, under the action of the first spring group, the upper panel 1 is separated from the front template 2, thereby driving the driving block 73 to move upward, and prompting the two symmetrically arranged inserts 71 to move oppositely under the action of the inclined rod 72, thereby realizing the separation of the water inlet pipe from the water pump housing. At the same time, the sprue head is pulled away from the gate sleeve 11 by the pulling needle 6; driven by the driving cylinder, the ejector rod of the injection molding machine acts on the ejector plate 91, so that the ejector plate 91 drives the ejector 92 and the pulling needle 6 to move, thereby ejecting the water pump housing and making the sprue head separate from the tubular cutter 5.

[0043] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An injection mold for manufacturing a product having a tubular body component, comprising, from top to bottom, an upper panel, a front template, a rear template, and a lower panel; the front template and the rear template correspondingly cooperate; characterized in that: It also has a sprue cutter device and a pulling needle; a female mold core is fixed on the front template; a male mold core is provided on the rear template; a sprue sleeve is fixed on the upper panel; a guide sleeve for inserting the sprue sleeve is fixed on the female mold core; the sprue cutter device includes a tubular cutter for performing sprue cutting under the drive of a cutter drive device; the pulling needle is slidably arranged in the tubular cutter, and the upper end of the pulling needle is the pulling part; the tubular cutter passes through the rear template and the male mold core in turn, and faces the guide sleeve; the tubular cutter slides with the rear template and the male mold core; the upper end of the tubular cutter is the cutting part; after the mold is closed, the lower end face of the guide sleeve, the part of the tubular cutter extending out of the male mold core, and the parts of the two corresponding to the female mold core form a forming cavity with a tube body on the product of the tubular body component; the surface roughness of the tubular cutter is less than or equal to Ra0.

4.

2. The injection mold for manufacturing a product having a tubular body according to claim 1, characterized in that: It also includes a movable insert mechanism; the movable insert mechanism includes two symmetrically arranged insert assemblies; the insert assembly includes an insert, an inclined rod and a driving block; the insert is slidably arranged on the female mold core, and its end extending into the interior of the female mold core is a forming part, and the other end is provided with an inclined hole that cooperates with the inclined rod; the inclined rod is arranged on the driving block, and the driving block is fixedly arranged on the upper panel; the front template is provided with a first spring group for driving the upper panel to separate from the front template; after the mold is closed, the forming part of the insert, the lower end face of the guide sleeve, and the part of the tubular cutter extending out of the male mold core form a forming cavity with an upper tube body of the tube body component product.

3. An injection mold for manufacturing a product having a tubular body according to claim 1 or 2, characterized in that: The rear template is provided with a core-pulling mechanism; the core-pulling mechanism includes a core shaft that participates in the forming when driven by a core-pulling driving device.

4. An injection mold for manufacturing a product having a tubular body according to claim 1 or 2, characterized in that: The pulling portion of the pulling needle is a block with an inclined surface; the inclined surface extends outward from top to bottom and tilts; the pulling portion is located in the tubular cutter and forms a filling cavity with the tubular cutter.

5. An injection mold for manufacturing a product having a tubular body according to claim 1 or 2, characterized in that: The diameter of the portion of the tubular cutter extending out of the male mold core gradually increases from top to bottom.

6. The injection mold for manufacturing a product having a tubular body according to claim 3, characterized in that: The pulling portion of the pulling needle is a block with an inclined surface; the inclined surface extends outward from top to bottom and tilts; the pulling portion is located in the tubular cutter and forms a filling cavity with the tubular cutter.

7. The injection mold for manufacturing a product having a tubular body according to claim 3, characterized in that: The diameter of the portion of the tubular cutter extending out of the male mold core gradually increases from top to bottom.

8. The injection mold for manufacturing a product having a tubular body according to claim 3, characterized in that: It also has an ejector pin assembly; the ejector pin assembly includes an ejector pin plate and multiple ejectors; multiple return rods are fixedly provided on the lower end surface of the rear template, and a second return spring is sleeved on the return rod; the ejector pin plate is slidably arranged on the return rod, and the two ends of the second return spring act on the lower end surface of the rear template and the upper end surface of the ejector pin plate respectively; the lower panel is provided with a through hole for the ejector pin of the injection molding machine to pass through; the ejectors are all fixedly arranged on the ejector pin plate, and each ejector pin acts on the inner wall and / or connecting hole and / or reinforcing rib of the product with a tubular body component.

9. The injection mold for manufacturing a product having a tubular body according to claim 8, characterized in that: The cutter drive device includes a cutter seat and a high-pressure micro-motion cylinder; the lower end of the tubular cutter extends from the rear template and is fixedly connected to the cutter seat, and the lower end of the pull needle extends from the lower end of the tubular cutter, passes through the cutter seat and is fixedly connected to the ejector plate; the core pulling drive device is a cylinder, and the telescopic part of the cylinder is fixedly connected to the core shaft.

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