Injection apparatus and molding machine

An injection apparatus comprising:

• an injection cylinder which can be connected to a plunger capable of sliding in a sleeve communicated with the inside of a mold,
• a flow rate control valve which configures a meter-in circuit or meter-out circuit of the injection cylinder,
• a sensor which detects at least one of the position or velocity of the plunger,
• an input device which accepts an operation of the user, and
• a control device which controls the flow rate control valve, wherein
• the flow rate control valve is an overlap type where a valve body is positioned at a position in accordance with a command value of the input control command, a port is closed as it is at the time when the valve body is positioned in the predetermined overlapping range even if the valve body moves, and the port starts to be opened by the valve body passing through the overlapping range, and
• the control device comprises
• a memory unit which holds characteristic information linking the command value of the control command to the flow rate control valve and the velocity of the plunger including also the movement of the plunger which is caused by a gap flow even if the valve body is positioned in the overlapping range,
• a target velocity setting part for setting the target velocity of the plunger based on operation of the input device,
• a command value setting part which sets the command value of the control command for open control of the flow rate control valve at the time of start of injection by specifying the command value of the control command to the flow rate control valve corresponding to the target velocity set by the target velocity setting part based on the characteristic information,
• an open control part which outputs a control command having a command value set by the command value setting part and performs open control, and
• a feedback control part which performs feedback control of the flow rate control valve so that the target velocity set by the target velocity setting part is realized based on the detection value of the sensor after the open control.