Hydraulic double-tool-rest structure

Abstract

According to the technical scheme, the hydraulic double-tool-rest structure is characterized in that the hydraulic double-tool-rest structure comprises a tool turret base, a tool rest body is fixed to the upper portion of the tool turret base, and a hydraulic system is transversely arranged in the tool rest body; a cover plate is fixed to the upper portion of the tool rest body, a movable block is installed on one side of the tool rest body, an upper tool holder is installed on the movable block, a lower tool holder is installed on the tool rest body, a damping block is arranged on the lower tool holder, and a brake disc is installed between the upper tool holder and the lower tool holder. The brake disc comprises an upper brake surface and a lower brake surface, a small outer circle is fixed on the brake disc, and an outer mounting surface is arranged on the small outer circle. The double-tool-rest structure is compact in structure, high in system rigidity, easy to adjust the axial size, capable of restraining the same-frequency resonance trend and good in compatibility.

Description

Technical Field

[0001] The utility model relates to the technical field of lathe processing, in particular to a hydraulic double-tool rest structure. Background Art

[0002] Brake discs are important components in the automotive industry. The thickness difference of the brake surface of some products is required to be within 0.005mm, and the processing area is mostly thin-walled brake surfaces. The main processing method at present is the servo double-knife processing structure, which controls the linkage of the servo motor and the lead screw through the CNC system to drive the opening and closing of the double-knife holder. The gap between the motor and the lead screw itself and the repeated positioning error are difficult to control, resulting in the thickness tolerance of the brake disc exceeding the tolerance.

[0003] In addition, since the upper and lower blades are completely identical when machining the thin-wall brake surface, the upper and lower blade tips will produce approximately identical natural frequencies, which can easily cause resonance, resulting in poor surface roughness, flatness and thickness of the brake surface, restricting product quality and production efficiency.

[0004] Finally, the turret interfaces of most machine tool manufacturers are incompatible. Even the turret interfaces of different models from the same machine tool manufacturer are different. The current mainstream double-tool processing structure is non-standard and tailor-made, with poor compatibility, long production cycle and high cost. Utility Model Content

[0005] In response to the problems mentioned in the background technology, the purpose of the utility model is to provide a hydraulic double tool holder structure with compact structure, strong system rigidity, easy adjustment of axial size, suppression of same-frequency resonance tendency and good compatibility, so as to solve the problems mentioned in the background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A hydraulic double tool holder structure comprises a turret base, a tool holder body is fixed above the turret base, a hydraulic system is arranged laterally inside the tool holder body; a cover plate is fixed above the tool holder body, a movable block is installed on one side of the tool holder body, an upper tool clamp is installed on the movable block, a lower tool clamp is installed on the tool holder body, a shock absorbing block is arranged on the lower tool clamp, a brake disc is installed between the upper and lower tool clamps, the brake disc comprises an upper braking surface and a lower braking surface, a small outer circle is fixed on the brake disc, and the small outer circle has an outer mounting surface.

[0008] Preferably, the turret base is fixed above the adapter by a turret base locking screw and a turret positioning key.

[0009] Preferably, the tool holder body is provided with an oil inlet joint, a first lubricating oil replenishing hole plug, and a second lubricating oil replenishing hole plug.

[0010] Preferably, the cover plate is connected and fixed on the top of the tool holder body by means of a limiting bolt locking nut, a cover plate locking screw, a limiting bolt, a reset spring locking screw, and a cover plate locating pin.

[0011] Preferably, the upper tool holder is provided with an X-axial distance adjustment hole and a pressure plate, and a cemented carbide gasket is provided between the pressure plate and the upper tool holder.

[0012] Preferably, a locking screw is installed at the X-axis distance adjustment hole, and a pressure plate screw and a screw anti-slip gasket are provided at the pressure plate.

[0013] Preferably, the lower tool holder is provided with a Z-axis distance adjustment hole, and an indexable CBN blade is installed at the Z-axis distance adjustment hole.

[0014] In summary, the utility model mainly has the following beneficial effects:

[0015] The double tool holder structure is compact, the system has strong rigidity, is easy to adjust the axial size, suppresses the tendency of same-frequency resonance, and has good compatibility; the shock absorber fixed on the lower tool clamp plays a role in eliminating vibration, and the hydraulic system is arranged laterally inside the tool holder. The hydraulic system drives the reciprocating motion of its piston under the interaction of its internal rectangular spring and hydraulic oil. The piston end engages with the top of the pendulum arranged longitudinally inside the tool holder, converting the reciprocating motion of the piston into the swing of the bottom of the pendulum, so that the high and low points of the arc surface of the force block at the bottom of the pendulum act reciprocatingly on the load-bearing block at the tail of the movable block, thereby realizing the up and down swing of the movable block, and then realizing the opening and closing of the upper and lower tool clamps, ensuring that the processed brake surface is not scratched when the tool is withdrawn, avoiding repeated positioning errors during the brake disc processing, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Reference numerals: 100, turret base; 200, tool holder body; 300, cover plate; 400, movable block; 500, upper tool clamp; 600, shock-absorbing block; 700, lower tool clamp; 00, brake disc; 01a, upper brake surface; 01b, lower brake surface; 02, small outer circle; 03, outer mounting surface; 102, turret base locking screw; 103, turret positioning key; 201, oil inlet connector; 202, lubricating oil replenishing hole plug; 203, plug for the second lubricating oil replenishing hole; 301, limit bolt locking nut; 302, cover plate locking screw; 303, limit bolt; 304, reset spring locking screw; 305, cover plate positioning pin; 502, X-axial distance adjustment hole; 503, pressure plate; 504, carbide gasket; 507, screw anti-slip gasket; 506, pressure plate screw; 703, Z-axial distance adjustment hole; 704, indexable CBN insert. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example 1

[0020] refer to Figure 1 A hydraulic double tool holder structure comprises a turret base 100, a tool holder body 200 is fixed on the top of the turret base 100, and a hydraulic system is arranged laterally inside the tool holder body 200; a cover plate 300 is fixed on the top of the tool holder body 200, a movable block 400 is installed on one side of the tool holder body 200, an upper tool clamp 500 is installed on the movable block 400, a lower tool clamp 700 is installed on the tool holder body 200, a shock absorbing block 600 is provided on the lower tool clamp 700, a brake disc 00 is installed between the upper tool clamp 500 and the lower tool clamp 700, the brake disc 00 comprises an upper braking surface 01a and a lower braking surface 01b, a small outer circle 02 is fixed on the brake disc 00, and the small outer circle 02 has an outer mounting surface 03.

[0021] The turret base 100 is fixed on the top of the adapter by means of a turret base locking screw 102 and a turret positioning key 103 .

[0022] The tool holder body 200 is provided with an oil inlet connector 201 , a first lubricating oil replenishing hole plug 202 , and a second lubricating oil replenishing hole plug 203 .

[0023] The cover plate 300 is connected and fixed on the top of the tool holder body 200 by means of a limiting bolt locking nut 301 , a cover plate locking screw 302 , a limiting bolt 303 , a return spring locking screw 304 , and a cover plate positioning pin 305 .

[0024] The upper tool holder 500 is provided with an X-axis distance adjustment hole 502 and a pressing plate 503 , and a cemented carbide gasket 504 is provided between the pressing plate 503 and the upper tool holder 500 .

[0025] A locking screw 501 is installed at the X-axis distance adjustment hole 502 , and a pressure plate screw 506 and a screw anti-slip gasket 507 are provided at the pressure plate 503 .

[0026] The lower tool holder 700 is provided with a Z-axis distance adjustment hole 703 , and an indexable CBN blade 704 is installed at the Z-axis distance adjustment hole 703 .

[0027] Among them, the double tool holder structure is compact, the system rigidity is strong, the axial size is easy to adjust, the same frequency resonance tendency is suppressed, and the compatibility is good; the shock-absorbing block 600 fixed on the lower tool clamp 700 plays a role in eliminating vibration, and the hydraulic system is arranged horizontally inside the tool holder body 200. The hydraulic system drives the reciprocating motion of its piston under the interaction of its internal rectangular spring and hydraulic oil. The piston end engages with the top of the pendulum arranged longitudinally inside the tool holder body 200, and converts the reciprocating motion of the piston into the swing of the bottom of the pendulum, so that the high and low points of the arc surface of the force block at the bottom of the pendulum act reciprocatingly on the load-bearing block at the tail of the movable block 400, thereby realizing the up and down swing of the movable block 400, and then realizing the opening and closing of the upper and lower tool clamps, ensuring that the processed brake surface is not scratched when the tool is withdrawn, avoiding repeated positioning errors during the brake disc processing, and improving production efficiency.

[0028] Example 2

[0029] refer to Figure 1 A hydraulic double tool rest structure for processing disc-type parts, the double tool rest structure includes a replaceable adapter fixed on a machine tool turret, a hydraulic double tool rest mounted on the adapter, a cover plate 300 fixed on the top of the hydraulic double tool rest for limiting and sealing, a movable block 400 fixed on the upper part of the tool rest below the cover plate 300, an upper tool holder 500 with a radial adjustment function fixed on the front end of the movable block 400, a lower tool holder 700 with an axial adjustment function fixed below the front end of the tool rest, a shock absorber fixed on the lower tool holder 700 for eliminating vibration, and a transversely arranged inner portion of the tool rest. The hydraulic system, under the interaction of its internal rectangular spring and hydraulic oil, drives the reciprocating motion of its piston. The piston end engages with the top of the pendulum longitudinally arranged inside the tool holder, converting the reciprocating motion of the piston into the swinging of the bottom of the pendulum, so that the high and low points of the arc surface of the force block at the bottom of the pendulum act reciprocatingly on the load-bearing block at the tail of the movable block 400, thereby realizing the up and down swing of the movable block 400, and then realizing the opening and closing of the upper and lower tool clamps 700, ensuring that the processed brake surface is not scratched when the tool is retracted, avoiding repeated positioning errors during the processing of the brake disc 00, and improving production efficiency.

[0030] For the replaceable adapter, first align the tool holder positioning key and install it into the tool holder positioning key receiving groove, which not only plays a positioning role, but also has the function of increasing the structural strength and system rigidity; then, the four auxiliary positioning pins are interference-fitted into the pin receiving holes of the tool holder base in turn, and finally, the four screws are tightened to make the top surface of the adapter and the bottom surface of the tool holder fit completely; and the positioning and locking device on one side connected to the turret is customized according to the specific requirements of the turret, with BMT interface, CAPTO interface, VDI interface, etc.; thus, a double tool holder structure is realized, and all components except the adapter remain unchanged, which is compatible with all machine tool turrets.

[0031] The oil inlet is opened at the lower left side of the hydraulic double tool holder and sealed with an oil plug to ensure that the hydraulic oil inside the hydraulic system does not overflow during storage and transportation. After installation, the oil inlet is connected to the high-pressure oil pipe on the turret, and the input of oil pressure is controlled by a solenoid valve.

[0032] The hydraulic system includes: a piston shaft that moves laterally under the joint action of hydraulic oil and a rectangular spring, a cover locking screw, a cover that provides support force for the rectangular spring, a cover center hole plug for sealing and dust prevention, a rectangular spring that provides piston shaft reset force, a piston ring sealing ring for positively sealing the hydraulic oil, a self-lubricating bushing fixed inside the hydraulic double tool holder to provide guidance and support, a piston shaft sealing ring inserted in the self-lubricating bushing for negatively sealing the hydraulic oil, a rack at the end of the piston shaft for meshing with the bottom gear teeth of the top hammer, and a cover locating pin for ensuring the matching accuracy of the cover and the hydraulic double tool holder.

[0033] Above the oil inlet are 202 - a plug for the lubricating oil replenishing hole (the junction between the bar teeth on the piston head and the ring teeth on the tail of the top hammer) and 203 - a plug for the lubricating oil replenishing hole (the junction between the movable block 400 and the arc surface of the top hammer head).

[0034] A horizontal axis of a movable block 400 is installed on the upper left side of the hydraulic double tool holder, passing through a mounting hole in the middle of the movable block 400 so that it can swing around the axis.

[0035] The movable block 400 includes: a movable block 400 body, a lower sealing strip of the movable block 400 and an upper sealing strip of the movable block 400 for sealing and dustproofing, a load-bearing block locking screw, and a load-bearing block; the movable block 400 is provided with a tool slot for accommodating an upper tool clamp 500, and the bottom and back surfaces of the upper tool clamp 500 are hinged to the two side walls of the tool slot by locking screws.

[0036] The X-axial distance adjustment hole 502 inside the upper tool clamp 500 is tapped with threads and an adjusting bolt is installed on one side close to the supporting surface of the movable block 400. The wrench passes through the X-axial distance adjustment hole 502 and is inserted into the countersunk hole of the adjusting bolt head. The adjusting bolt is rotated so that the tail of the adjusting bolt is against the supporting surface of the movable block 400. The reaction force moves the entire upper tool clamp 500 outward along the X-axial direction, thereby realizing the alignment of the cutting edges of the blades respectively fixed to the upper and lower tool clamps 700 in the Z-axial direction. In order to prevent dust and iron filings from clogging the adjustment hole, threads are tapped at its entrance and a sealing bolt is installed.

[0037] The top of the hydraulic double tool holder includes a sealing and fixing cover plate 300, a locking nut for fixing the limit bolt 303, a locking screw for the cover plate 300, a limit bolt 303 for adjusting the stroke of the movable block 400, a reset spring locking screw 304, a positioning pin for the cover plate 300, and a reset spring for the movable block 400 to bounce up;

[0038] A lower tool clamp 700 is installed at the lower front part of the hydraulic double tool holder, and a dumbbell-shaped adjusting bolt is installed in the Z-axial distance adjustment hole 703 inside the lower tool holder. A flat head locating pin is fixed at the front end of the hydraulic double tool holder, and the flat head part is stuck in the pit of the head of the dumbbell-shaped adjusting bolt. By rotating the dumbbell-shaped adjusting bolt, the pit on its head and the flat head locating pin are fixed in position, and the reaction force drives the entire lower tool clamp 700 to move up and down in the Z-axis, thereby realizing the cutting edge distance of the blades fixed on the upper and lower tool clamps 700 respectively, which is consistent with the actual required size of the product.

[0039] A shock-absorbing block 600 for eliminating vibration is installed on the lower tool clamp 700. By adjusting the square block at the end of the rotating shock-absorbing rod, the top of the ceramic wear-resistant head of the shock absorber and the cutting edge of the blade fixed on the lower tool clamp 700 can be adjusted to the same height position; in addition, the force applied to the spring by adjusting the bolt needs to be adjusted to adjust the pressure between the ceramic wear-resistant head and the surface of the workpiece to be processed.

[0040] Hydraulic oil with a pressure greater than 40 MPA is injected into the oil inlet of the hydraulic system. The oil pressure enters the closed oil tank, pushing the piston to slide to the right. The rack at the end of the piston meshes with the gear teeth on the top of the pendulum longitudinally arranged inside the tool holder. The rack transmits the reciprocating motion of the piston to the pendulum without gap. The highest point of the arc surface at the bottom of the pendulum deviates from the arc surface of the load-bearing block. Under the action of the reset spring, the entire movable block 400 is lifted upward, thereby realizing the opening and closing of the upper and lower tool clamps 700, ensuring that the processed brake surface is not scratched when the tool is retracted.

[0041] After the tool retraction action is completed and the oil pressure in the oil circuit is unloaded, the piston slides to the left under the action of the rectangular spring, and the piston end drives the pendulum to reset. The highest point of the pendulum arc surface hits the arc surface of the load-bearing block again, and the distance of 700 between the upper and lower tool clamps is restored to the state required by the product.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic double tool holder structure, characterized in that: The invention comprises a turret base (100), a tool holder body (200) is fixed on the top of the turret base (100), a hydraulic system is arranged transversely inside the tool holder body (200); a cover plate (300) is fixed on the top of the tool holder body (200), a movable block (400) is installed on one side of the tool holder body (200), an upper tool clamp (500) is installed on the movable block (400), a lower tool clamp (700) is installed on the tool holder body (200), a shock absorbing block (600) is arranged on the lower tool clamp (700), a brake disc (00) is installed between the upper tool clamp (500) and the lower tool clamp (700), the brake disc (00) comprises an upper braking surface (01a) and a lower braking surface (01b), a small outer circle (02) is fixed on the brake disc (00), and the small outer circle (02) has an outer mounting surface (03).

2. A hydraulic double tool holder structure according to claim 1, characterized in that: The turret base (100) is fixed above the adapter seat via a turret base locking screw (102) and a turret positioning key (103).

3. The hydraulic double tool holder structure according to claim 1, characterized in that: The tool holder body (200) is provided with an oil inlet joint (201), a first lubricating oil replenishing hole plug (202), and a second lubricating oil replenishing hole plug (203).

4. The hydraulic double tool holder structure according to claim 1, characterized in that: The cover plate (300) is connected and fixed above the tool holder body (200) via a limiting bolt locking nut (301), a cover plate locking screw (302), a limiting bolt (303), a return spring locking screw (304), and a cover plate positioning pin (305).

5. The hydraulic double tool holder structure according to claim 1, characterized in that: The upper tool holder (500) is provided with an X-axis distance adjustment hole (502) and a pressing plate (503), and a hard alloy gasket (504) is provided between the pressing plate (503) and the upper tool holder (500).

6. The hydraulic double tool holder structure according to claim 5, characterized in that: A locking screw (501) is installed at the X-axis distance adjustment hole (502), and a pressure plate screw (506) and a screw anti-slip gasket (507) are provided at the pressure plate (503).

7. The hydraulic double tool holder structure according to claim 1, characterized in that: The lower tool holder (700) is provided with a Z-axis distance adjustment hole (703), and an indexable CBN blade (704) is installed at the Z-axis distance adjustment hole (703).

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