JP3122550U - Double circle clamp platen design for injection molding machines - Google Patents

Abstract

The present invention provides a clamp platen design that can alleviate stress concentration, streamline the stress distribution, and ultimately achieve higher reliability.
A circular clamp platen includes a rectangular base plate 2, four guide holes 3, a circular inner reinforcing structure 4, an inner ring and an outer structure. And a radial reinforcing wedge 6. The main feature is that a circular (or oval) outer reinforcement structure 5 is provided on the base plate to form a smooth rounded transition circle with respect to the four guide holes. Useful for all injection molding machine clamping systems.
[Selection] Figure 2

Description

  The present invention relates to a clamp platen (fixed plate) of a novel design used in a general clamping system (clamping method), and more particularly to a clamp platen suitable for a clamping system of an injection molding machine.

Clamping unit (mold) of an injection molding machine including three clamping platens (fixed plate), that is, a fixed platen (fixed platen), a movable platen (movable platen), and a tail stock platen (tailstock) (The present invention is applicable to any two-platen type clamping system), but the main function of these three platens is to mount the mold Providing the necessary clamping force, providing a rigid support during the injection molding process and preventing the flushing of plastic molded parts. The shape of a conventional platen is usually configured in a rectangular form (see FIG. 1), and its base plate is always rectangular, and a reinforcing structure is provided on it (reference numerals 2, 4, and 6 in FIG. 1). reference). Such a design has several major defects: 1. poor power transmission 2. High stress concentration There is a non-uniform stress distribution, so such a design cannot achieve a uniform stress distribution state and ultimately affects platen stiffness and service life.
JP 08-267463 A

  According to extensive research, the design of the novel double circular clamp platen (fixed plate) can solve the above problems. This design can potentially alleviate stress concentrations, streamline stress distribution waste, and ultimately a more reliable clamp platen design.

  A circular clamp platen (FIG. 2) is typically placed at one corner with a rectangular base plate (reference numeral 2 in FIG. 2) whose thickness is less than one third of the total thickness of the platen. 4 guide holes (reference numeral 3 in FIG. 2), one circular inner reinforcement structure (reference numeral 4 in FIG. 2), inner ring (inner reinforcement structure) and outer structure (outer reinforcement structure) ) And a reinforcing wedge (symbol 6 in FIG. 2) that connects in a radial direction. The main feature is that a circular (or oval) shaped outer reinforcing structure (reference numeral 5 in FIG. 2) is provided on the base plate to form a smooth round transition circle with respect to the four guide holes. The portions indicated by reference numerals 4 and 5 in FIG. 2 form a double circular structure. The overall structure can be made of cast iron, spheroidal graphite cast iron or cast steel.

  According to the finite element method analysis using the soft air package “COSMOS”, the analysis results show the advantages of the following double circular clamp platen design over the conventional rectangular design.

  First, because of the perfectly symmetrical shape underlying the circular shape feature, there is no sharp shape change around the circular shape, thereby significantly reducing the risk of stress concentration. This structure has the obvious advantage that it can provide a uniform stress distribution, the force transmission path is shorter and the force transmission is more efficient. As a result, the clamp platen has a more rigid design.

  Secondly, with this new circular structure design, the total material usage (volume) is reduced by 10%, the maximum stress value is reduced by 2% and the deformation is also reduced by 5%. If the platen is designed under the same amount of conditions, the circular shaped structure design can further reduce stress concentration to 6.79% and deformation to 6.70%. In conclusion, with this circular shape structure and precisely calculated reinforced wedge dimensions and placement, the design can meet certain safety factor requirements, as well as material savings, higher rigidity, more With the advantage of good strength.

It is a perspective view which shows the rectangular clamp platen (fixed platen) of a prior art example. It is a perspective view which shows a novel double circle clamp platen (fixed platen).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clamp platen 2 Base plate 3 Guide hole 4 Inner reinforcement structure 5 Outer reinforcement structure 6 Reinforcement wedge

Claims (1)

A clamp platen for an injection molding machine,
1. It has a rectangular base plate with a center round hole,
2. The thickness of the base plate is smaller than 1/3 of the total thickness of the platen,
3. It has four guide holes at the four corners,
4. With one circular shaped inner reinforcement structure,
5. With a radial reinforcing wedge between the inner ring and the outer structure,
6). A circular (or oval) outer reinforcement structure is provided on the base plate,
7). The circular outer reinforcement structure is a clamp platen for an injection molding machine that forms a smooth rounded transition circle with respect to four guide holes.

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