RU2015902C1 - Casting mold for manufacture of articles with undercuts from plastics - Google Patents

Abstract

FIELD: molding. SUBSTANCE: mold has shaping slides 8 and guide columns 4. Guide column 4 has recess 5 for motion of slides 8. Slides 8 engage guide column 4 by means of pin 9. EFFECT: higher efficiency. 1 dwg

Description

 The invention relates to the manufacture of products from plastics, in particular to the design of molds for products with undercuts.

 Known forms with inclined guides in the form of grooves for moving sliders made in a movable half-mold. The design of these forms is laborious. In addition, the presence of the necessary pressure wedges and guide columns with bushings for centering the half-molds increases the dimensions of the molds and reduces its usable area.

 Also known is a form with inclined columns, sliding half-matrices placed on a movable holder made in the form of a frame connected with a traction system and pushing wedges on a fixed half-mold.

 The clip, traction and pressure wedges greatly complicate the form, increase its dimensions and reduce its usable area.

 The purpose of the invention is the expansion of technological capabilities and simplification of the design of the form.

 This goal is achieved in that the means for moving the sliders is made in the form of curly grooves located along the guide columns and placed in the grooves of the fingers, rigidly connected with the free ends of the respective sliders.

 The drawing shows an injection mold, section.

 The mold contains a base 1, a stationary holder 2, in which a sprue sleeve 3 and guide columns 4 with inclined grooves 5 are placed, a movable holder 6, in which a matrix 7 is placed with the mounting sliders 8 and a finger 9 installed therein, guide bushings 10, gasket 11 , base 12 and an ejection system consisting of a plate 13 with ejectors 14, gaskets 15, a thrust plate 16 with a shank 17 installed in it with a spring 18.

 The form works as follows. After filling out the form, the moving half-mold moves to the leftmost position. In this case, the guide column 4 groove 5 through the finger 9 pushes the design slider 8 from the product. Straight sections at the ends of the groove 5 are made to simplify the setup. With further movement, the shank 17 runs into the machine stop. The movable half-mold continues to move. The shank 17 acts on the thrust plate 16, the gasket 15 and through it to the ejectors 14, which push the product from the matrix 7.

 When the form is closed, the movable half-mold moves to the extreme right position. In this case, the shank 17 moves away from the machine stop, and the spring 18 returns the ejection system to its original position. When moving the moving part, the guide columns 4 with the guide bushings 10 provide centering of the movable and fixed half-molds and the groove 5 acts on the fingers 9, moving the forming sliders 8 to their original position. The form is completed and the cycle repeats.

 The proposed design of the mold is more technological and reliable in operation, allows you to better use the usable area. It also makes it possible to cast undercuts at an angle different from the direct one.

Claims (1)

 INJECTION FORM FOR PRODUCING PRODUCTS WITH UNDERWEARS FROM PLASTIC MASSES, comprising a fixed half-mold, a movable half-mold with sliding forming sliders, grooves, an ejection system, guide columns and means for moving the sliders, characterized in that, in order to expand technological capabilities and simplify the design of the mold means for moving the sliders are made in the form of curly grooves located along the guide columns, and placed in the grooves of the fingers, rigidly connected with the free ends appropriate sliders.