Half-drum type forming machine and machine head thereof

The utility model relates to tire production equipment, in particular to a half-drum type forming machine with an improved shoulder curve and a machine head of the half-drum type forming machine. A half-drum type forming machine head with an improved shoulder curve comprises an outer end straight line and the shoulder curve, and the height of the outer end straight line is H and hlt; hlt; h is the height from the bottom of the steel wire ring to the center, the shoulder curve is composed of three shoulder arcs which are internally tangent in pairs, and the arc radiuses R1, R2 and R3 are 5-20 mm, 10-25 mm and 80-150 mm in sequence from outside to inside; wherein R1 is tangent to the outer end straight line. According to the utility model, the occurrence rate of appearance defects such as tire seam allowance vacancy, tire side rubber shortage and tire side crack can be reduced, and meanwhile, the service life of the tire is prolonged as the tire bead fitting quality is improved during molding. 本实用新型涉及轮胎生产设备，具体涉