Worm gear machine

A worm gear machine comprising a workbench (100) for clamping a worm gear workpiece, a cutter holder (200) for clamping a cutter, a cutter holder adjusting system for adjusting a position of the cutter holder (200) relative to the workbench (100), and a hardware circuit, wherein

• the cutter holder (200) comprises a bigger bracket (201), a first slide rail (202) is disposed on the bigger bracket (201), a slide seat (203) in sliding fit with the first slide rail (202) is disposed on the first slide rail (202), a second slide rail (204) is disposed on the slide seat (203), a smaller bracket (205) in sliding fit with the second slide rail (204) is disposed on the second slide rail (204), and the first slide rail (202) and the second slide rail (204) are parallel to each other;
• and a cutter holder spindle (206) is disposed between the bigger bracket (201) and the slide seat (203), a cutter bar (207) synchronously rotating with the cutter holder spindle (206) is disposed between an end of the cutter holder spindle (206) facing toward the smaller bracket (205) and the smaller bracket (205), and a gearbox (208) for driving the cutter holder spindle (206) to rotate is disposed in the bigger bracket (201), wherein the smaller bracket (205) is smaller than the bigger bracket (201);
• and
• a first hydrostatic bearing mechanism is disposed between the slide seat (203) and the cutter holder spindle (206), and a second hydrostatic bearing mechanism is disposed between the cutter bar (207) and the smaller bracket (205);
• wherein the cutter holder adjusting system comprises:
• a base (300);
• an X-direction guide rail (301), and a pedestal (302) in sliding fit with the X-direction guide rail (301) which are arranged on the base (300);
• a Y-direction guide rail (303) perpendicular to the X-direction guide rail (301), and a cutter holder seat (304) in sliding fit with the Y-direction guide rail (303) which are arranged on the pedestal (302);
• and a Z-direction guide rail (305) which is disposed on the cutter holder seat (304);
• wherein the Z-direction guide rail (305) is perpendicular to both the X-direction guide rail (301) and the Y-direction guide rail (303);
• and wherein the bigger bracket (201) is mounted on the Z-direction guide rail (305) in sliding fit;
• wherein the first hydrostatic bearing mechanism comprises a first shaft sleeve (210) sleeved to the cutter holder spindle (206), and a first hydrostatic oil chamber is provided between the first shaft sleeve (210) and the cutter holder spindle (206);
• and
• an inner hole of the first shaft sleeve (210) is a conical hole, a conical section fitting with the first shaft sleeve (210) is provided on the cutter holder spindle (206), and the conical hole and the conical section have the same conicity;
• and a first mounting portion (203a) for mounting the cutter holder spindle (206) is disposed on the slide seat (203), and the first shaft sleeve (210) and a side of the first mounting portion (203a) are in limiting fit and are provided with a first adjusting washer (211) between the first shaft sleeve (210) and a side of the first mounting portion (203a), wherein the first adjusting washer (211) is configured for adjusting a position of the first shaft sleeve (210) along an axial direction of the first shaft sleeve (210) relative to the conical section to adjust a fit clearance between the first shaft sleeve (210) and the conical section;
• wherein a positioning plate (212) sleeved to the cutter holder spindle (206) is fixedly mounted on an other side of the first mounting portion (203a), and a first thrust bearing (213) is disposed on one side of the positioning plate (212) and a second thrust bearing (213) is disposed on an opposite side of the positioning plate (212), the first thrust bearing and the second thrust bearing being configured for bearing a force along an axial direction of both the first thrust bearing and the second thrust bearing;
• and a first shaft shoulder positioned between the conical section and the positioning plate (212) is disposed on the cutter holder spindle (206), a side of the positioning plate (212) away from the first shaft sleeve (210) is provided with a limit sleeve (214) sleeved to the cutter holder spindle (206), and a side of the limit sleeve (214) away from the positioning plate (212) is provided with a spindle nut (215) in threaded fit with the cutter holder spindle (206), wherein one of the thrust bearings (213) is disposed between the positioning plate (212) and the first shaft shoulder, and the other of the thrust bearings (213) is disposed between the positioning plate (212) and the limit sleeve (214);
• and
• wherein a sealing mechanism is further disposed on two ends of the first hydrostatic oil chamber;
• and the sealing mechanism comprises a first sealing ring (216), a sealing sleeve (217) and a second sealing ring (218), the first sealing ring (216) is disposed between the first shaft sleeve (210) and the cutter holder spindle (206), the sealing sleeve (217) is sleeved to the limit sleeve (214), and the second sealing ring (218) is disposed between the sealing sleeve (217) and the limit sleeve (214);
• wherein the second hydrostatic bearing mechanism comprises a first sleeve (220) sleeved to the cutter bar (207) in sliding fit and synchronously rotating with the cutter bar (207), a second shaft sleeve (221) is sleeved to the first sleeve (220), and a second hydrostatic oil chamber is provided between the second shaft sleeve (221) and the first sleeve (220);
• and
• an outer wall of the second shaft sleeve (221) is a conical surface, a conical through hole fitting with the conical surface is provided on the smaller bracket (205), and the conical surface and the conical through hole have the same conicity;
• and an expansion seam (222) is provided on the second shaft sleeve (221) along a longitudinal direction of the second shaft sleeve (221), and a clearance adjusting mechanism for adjusting a position of the second shaft sleeve (221) along an axial direction of the second shaft sleeve (221) relative to the conical through hole to adjust a fit clearance between the second shaft sleeve (221) and the first sleeve (220) is disposed on the smaller bracket (205), wherein the clearance adjusting mechanism comprises two cover plates (227), wherein each cover plate of the two cover plates (227) respectively is disposed on a respective one of two sides of the smaller bracket (205), where a clearance adjusting washer (228) is disposed between one of the two cover plates (227) and the second shaft sleeve (221), and an adjusting washer (229) is disposed between the other one of the two cover plates (227) and a sidewall of the smaller bracket (205);
• wherein deformation grooves (223) are further annularly and uniformly distributed on an outer sidewall of the second shaft sleeve (221), each of the deformation grooves (223) is arranged along the longitudinal direction of the second shaft sleeve (221), and each of the deformation grooves (223) is provided therein with a metal rubber elastomer (248) for driving the second shaft sleeve (221) to deform adaptively, wherein a cross section of each metal rubber (248) is tapered along the longitudinal direction of the second shaft sleeve (221) towards the clearance adjusting washer (228);
• and an oil groove (224) is further provided on an inner wall of the second shaft sleeve (221), an oil hole (225) interconnected with an outer wall of the second shaft sleeve (221) is provided in the oil groove (224), and an annular oil groove (226) corresponding to the oil hole (225) is provided on an inner wall of the conical through hole.