Injection Molding Machine Tie Bars

An injection molding machine consists of tie bars that support a platen and mold. The space between tie-bars controls the mold's size. It also has heater bands that heat and maintain a constant temperature in the barrel. Tie bars also support a screw that meters the feed material and plasticates it.

Roller thickness 166

The tie bar is a part of an injection molding machine that is used to connect the plates. There are two main types of tie bars: free end and fixed end. A free end extends vertically from the first platen, and the fixed end extends axially along the bore axis 132. The tie bar may be made of any suitable material, but is typically quite heavy.

Injection molding machines use tie bars that connect the moving and stationary platens. Tie bars connect the two and act as a clamping force across the mold. Each tie bar is attached to a piston or other piece of hardware.

Tie bar connection bosses 132a, 132b

Injection molding machines have tie bar engagement apparatus to hold tie bars in place and can be operated using a plurality of ways. For example, tie bars 124 can be engaged when the first platen 106 is closed or when the first platen is opened. Alternatively, the tie bars may be disengaged for a portion of the molding cycle.

Support rollers are disposed below the tie bar and may be laterally centred relative to the tie bar. The support roller 160a may have vertical components but may be symmetrical in vertical plane 2178. The support roller may also be configured with horizontal components to guide the tie bar in contact with the bore 138a.

Tie bar engagement apparatuses 156

Tie bar engagement apparatuses 156 have two basic features. One of these is a support roller fixed to a first platen and positioned near the respective bore 138a-d of the tie bar 124a-d. The second feature is a spacer with two sides that are spaced apart from one another. These two sides are configured to engage a complementary bearing surface 170 on the tie bar 124a.

Tie bar engagement apparatuses 156 may include support rollers and alignment members. These elements may be fixed to the first platen 106 or movable with it. Tie bars engage with these members to transmit the weight of the machine components to the tie bar.

Tie bar alignment bearing surfaces

Tie bar alignment bearing surfaces of an injection molding machine are critical to the proper operation of the machine. They must be parallel with each other and must be properly adjusted. In some cases, shims should be provided for this purpose. However, it is always best to consult an expert in civil engineering.

In one configuration, the tie bar 2124a shifts to the right while the tie bar axis aligns with the bore axis. As a result, the support roller 1160a contacts the bearing surface 1170 at two points. The net force on the tie bar is equal to the sum of these two forces.

In another arrangement, the tie bar is supported by connecting members that extend between the first and second platens. These connecting members exert a clamping force across the mold. They extend along respective tie bar axes 126, which are offset from the machine axis 116.

Die-height controller 40

The die-height controller is used to set the platen height. This control device is powered by a hydraulic motor or chain drive and moves the die-height platen. The platen moves along guide rods that extend from the mold platen to the die-height platen.

The platens in an injection molding machine are connected by tie bars. To install the mold, the operator needs to place the stationary mold platen 18 and the movable platen 5. The plates must be positioned at a distance sufficient for the mold to be placed in the proper position.

The die-height adjusting nuts 21 to 24 are powered by motors M1-M4. These motors are controlled by the die-height controller 40 based on rotation commands. In addition, the motors' position detectors feed signals to the die-height controller 40.