一种具有二次开模功能的模具

Abstract

本实用新型属于注塑模具技术领域，尤其涉及一种具有二次开模功能的模具。模具包括：第一模板和第二模板，并可沿第一分型面开模；托板，其配置成与第二模板沿第二分型面进行二次开模，以允许第二模板在开模过程中相对于托板产生预设的浮动位移；顶针机构，其收容于托板内，并由第一油缸驱动以产生脱模动作；斜顶辅助机构，用于对注塑件进行脱模，且斜顶辅助机构包括浮动补偿组件，以在二次开模期间补偿第二模板的浮动位移；内抽滑块机构，用于对注塑件的内部倒扣特征进行抽芯，且内抽滑块机构的动力自于第二模板的浮动位移；以及外部滑块机构，包括由第二油缸独立驱动的滑块，用于对注塑件的外部倒扣特征进行抽芯。

Claims

1. A mold with a secondary mold opening function for molding an injection molded part with complex inner and outer undercuts, characterized in that, The mold includes: The first template and the second template together define the mold cavity for molding the injection molded part, and the mold can be opened along the first parting surface; A tray is configured to be opened twice along the second parting surface with the second template, so as to allow the second template to generate a preset floating displacement relative to the tray during the mold opening process; The ejector mechanism is housed within the tray and is driven by the first hydraulic cylinder to produce a demolding action; An inclined ejector mechanism is used to demold the injection molded part, and the inclined ejector mechanism includes a floating compensation component to compensate for the floating displacement of the second mold plate during secondary mold opening; An internal sliding block mechanism is used to pull the core out of the internal undercut feature of the injection molded part, and the power of the internal sliding block mechanism comes from the floating displacement of the second template; and An external slider mechanism, including a slider independently driven by a second hydraulic cylinder, is used to pull the core out of the external undercut feature of the injection molded part.

2. The mold of claim 1, wherein The inclined top auxiliary mechanism includes an inclined top rod and an auxiliary rod arranged parallel to the inclined top rod; the floating compensation component includes a sliding pin fixed to the lower end of the auxiliary rod and a guide groove formed on the slide block, the sliding pin being slidably received in the guide groove, the slide block being fixed to a base plate associated with the ejector mechanism, and the upper end of the auxiliary rod being connected to the bottom of the second template through a fixed seat.

3. The mold of claim 2, wherein, The fixed base of the inclined top auxiliary mechanism includes a housing, on which a through hole for the auxiliary rod to pass through and a laterally arranged positioning pin are provided; the outer peripheral wall of the auxiliary rod is provided with an annular groove, which cooperates with the positioning pin, thereby allowing the auxiliary rod to rotate while axially positioning it.

4. The mold of claim 2, wherein The inclined top auxiliary mechanism further includes an inclined top seat, the lower end of the inclined top rod being movably supported inside the inclined top seat; the inclined top seat defines an internal cavity, and a guide groove is formed on the inner wall of the cavity; a sliding piece is slidably received in the guide groove; a first rotating block and a second rotating block are rotatably connected to the sliding piece; the lower end of the inclined top rod is non-rotatably coupled to the first rotating block, and the auxiliary rod passes through the second rotating block.

5. The mold of claim 2, wherein The inclined ejector auxiliary mechanism also includes an inclined ejector block, which is locked to the upper end of the inclined ejector rod by a horizontally arranged connecting pin; the middle section of the inclined ejector rod is fitted with an upper guide sleeve, a ring sleeve and a lower guide sleeve from top to bottom along its axial direction; a first baffle is fixedly connected to the lower guide sleeve, and the first baffle is configured to be fixedly connected to the second template of the mold.

6. The mold of claim 1, wherein The inner sliding block mechanism includes an inner sliding block housed within the second template and a T-shaped seat fixed to the support plate; a sliding block insert is installed on the top of the inner sliding block, and the sliding block insert is used to directly form the internal undercut feature; a guide groove is provided at the bottom of the inner sliding block, and a T-shaped block is fixed on the T-shaped seat; the floating displacement of the second template is converted into the core-pulling movement of the inner sliding block through the sliding fit between the guide groove and the T-shaped block.

7. The mold of claim 6, wherein The inner sliding block of the inner sliding block mechanism is also fitted with a guide sleeve; the lower end of the guide sleeve is connected to a baffle plate, which is configured to be fixedly connected to the second template of the mold to fix and guide the guide sleeve axially.

8. The mold of claim 1, wherein The external slider mechanism also includes: A support bracket is fixedly connected to the second template. A second hydraulic cylinder is mounted and fixedly installed on the support bracket, and the piston rod of the second hydraulic cylinder is connected to the rear end of the slider to directly drive the slider to produce a core-pulling motion. The pressure plate is fixed to the bracket and located above the slider. The wear-resistant plate slides in contact with the upper surface of the slider to guide the sliding of the slider and prevent it from floating when subjected to force.

9. The mold of claim 8, wherein, The external slider mechanism also includes: The travel stop bar and the limit block are mounted on the bracket to limit the end point of the core pulling stroke of the slider; A limit switch, mounted on the bracket and configured to be triggered when the slider reaches the end of its stroke, provides a position feedback signal to the main control system of the mold; and A cooling water channel block, integrated or attached to the slider, is used to regulate the operating temperature of the slider by circulating cooling water.

10. The mold of claim 1, wherein, The mold also includes a fastening mechanism, the base of which is mounted on the ejector pin mechanism. The fastening mechanism also includes a fastener and a fastener key. The fastener is mounted on the support plate, and the fastener key is mounted on the second template. The fastener has a groove, and the fastener key is configured to selectively engage and lock with the groove. After the second template completes the floating displacement relative to the support plate, the snap key engages and locks with the groove of the fastener to restrict further movement of the second template and allow the ejector mechanism to continue to move independently under the drive of the hydraulic cylinder to drive the inclined ejector auxiliary mechanism to demold the injection molded part.

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