Special tool for flat-head center

Abstract

The invention provides a special tool for a flat-head center, which can ensure the positioning precision and stability of the center and ensure the machining precision of a blade. The device comprises a center shaft, the center shaft is installed in a center seat, the center seat is installed in an installation cavity of a machine tool sliding barrel and connected with the installation cavity through a screw, and the shape of the installation cavity of the machine tool sliding barrel is matched with the shape of the center seat. The center shaft comprises a shaft body and a top head, the top surface of the top head is a plane, and a tooth surface pressing block is fixedly mounted on the top surface of the top head; the axle body comprises three sections of cylinders of which the radiuses are sequentially reduced from top to bottom, namely a first cylinder section, a second cylinder section and a third cylinder section, and a thrust ball bearing and a needle bearing are sleeved outside the joint of the third cylinder section and the center seat from top to bottom; a pair of angular contact ball bearings are sleeved outside the joint of the second column section and the center seat from top to bottom, an end cover is pressed on the upper end surface of the outer ring of the angular contact ball bearing above, the end cover is sleeved outside the first column section, and a first sealing ring is arranged at the joint of the end cover and the first column section.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool centers, in particular to a special tooling for a flat-head center. Background Art

[0002] The tip is a machine tool component in mechanical processing. It can fix the workpiece on the machine tool workbench to accurately fix the position, which is conducive to improving the processing accuracy. The tip head of the existing machine tool tip is usually conical. The tip head is inserted into the center hole of the blade to realize the positioning of the blade. However, during the blade processing, the center hole of the blade often deforms due to force. At this time, the tip head does not match the center hole, and the tip cannot be inserted into the center hole, or a gap appears between the tip and the center hole, causing the blade to loosen. This leads to a decrease in the positioning accuracy and stability of the tip. Summary of the invention

[0003] In view of the problem that in the existing blade processing, the center hole of the blade is deformed due to force, the tip and the center hole do not match each other, causing the blade to loosen, resulting in a decrease in the positioning accuracy and stability of the tip. The present invention provides a special tooling for a flat-head tip, which can ensure the positioning accuracy and stability of the tip and ensure the processing accuracy of the blade.

[0004] A special tooling for a flat-head center, comprising a center shaft, the center shaft is installed in a center seat, the center seat is installed in a mounting cavity of a machine tool slide, and the two are connected by screws, and the shape of the mounting cavity of the machine tool slide matches the shape of the center seat; it is characterized in that: the center shaft comprises an axle body and a plug, the top surface of the plug is a plane, and a tooth surface pressure block is fixedly installed on the top surface of the plug; the axle body comprises three sections of cylinders with decreasing radius from top to bottom, namely the first column section, the second column section, and the third column section, and the third column section and the center seat are connected At the junction of the second column section and the top seat, a thrust ball bearing and a needle bearing are mounted on the outside from top to bottom; at the junction of the second column section and the top seat, a pair of angular contact ball bearings are mounted on the outside from top to bottom, and an end cover is pressed on the upper end surface of the outer ring of the upper angular contact ball bearing, and the end cover is mounted on the outside of the first column section, a first sealing ring is arranged at the junction of the end cover and the first column section, and a second sealing ring is arranged at the junction of the end cover and the top seat, and the needle bearing, the thrust ball bearing and the angular contact ball bearing are used to prevent radial displacement of the top.

[0005] It is further characterized by: The bottom end cover of the shaft body is provided with a plug; The plug and the end cover are used to prevent the compression needle bearing, the thrust ball bearing and the angular contact ball bearing from axial displacement when they are subjected to force.

[0006] After adopting the above structure of the present invention, the tooth surface pressure block is pressed against the plane of the center hole of the blade. The extremely high friction and bite force of the tooth surface pressure block can achieve stable positioning of the blade. The positioning does not rely on the center hole. It can be used even if the center hole is deformed, which improves the positioning accuracy and stability of the blade and ensures the processing accuracy of the blade. The setting of needle bearings, thrust ball bearings, and angular contact ball bearings can prevent radial displacement of the top, thereby ensuring the positioning accuracy and stability. The setting of the plug and the end cover can press the needle bearings, thrust ball bearings, and angular contact ball bearings to prevent axial displacement when the bearings are stressed, further ensuring the positioning accuracy and stability as well as the processing accuracy of the blade. The first sealing ring and the second sealing ring ensure the installation sealing between the end cover, the top shaft, and the top seat, prevent the top itself from loosening, and ensure the positioning accuracy and stability as well as the processing accuracy of the blade from the perspective of ensuring the stable installation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of a cross-section of the present invention; Figure 2 It is a schematic diagram of the axonometric view of the present invention; Figure 3 It is a schematic diagram of the structure when the four-sided Morse cone is installed in the present invention. DETAILED DESCRIPTION

[0008] See Figure 1 , Figure 2 A special tooling for a flat-head center, comprising a center shaft 1, the center shaft 1 is installed in a center seat 4, the center seat 4 is installed in a mounting cavity of a machine tool slide 13, and the two are connected by screws, and the shape of the mounting cavity of the machine tool slide 13 matches the shape of the center seat 4; the center shaft 1 comprises an axle body 12 and a plug 11, the top surface of the plug 11 is a plane, and a tooth surface pressing block 14 is fixedly installed on the top surface of the plug 11; the axle body 12 comprises three sections of cylinders with decreasing radius from top to bottom, namely a first column section 121, a second column section 122, a third column section 123, and a third column section 123. At the junction with the top seat 4, a thrust ball bearing 6 and a needle bearing 7 are mounted on the outside from top to bottom; at the junction with the second column section 122 and the top seat 4, a pair of angular contact ball bearings 5 ​​are mounted on the outside from top to bottom, and the upper end surface of the outer ring of the upper angular contact ball bearing 5 is pressed with an end cover 2, and the end cover 2 is mounted on the outside of the first column section 121. A first sealing ring 8 is arranged at the junction of the end cover 2 and the first column section 121, and a second sealing ring 9 is arranged at the junction of the end cover 2 and the top seat 4. The needle bearing 7, thrust ball bearing 6, and angular contact ball bearing 5 are used to prevent radial displacement of the top.

[0009] The bottom end cover of the shaft body 12 is provided with a plug 10 .

[0010] The plug 10 and the end cover 2 are used to prevent the compression needle bearing 7, the thrust ball bearing 6, and the angular contact ball bearing 5 from axial displacement when they are subjected to force.

[0011] See Figure 3 When the center is used for a four-axis machine tool, a four-axis Morse taper 15 is installed at the bottom of the center seat 4, and the four-axis Morse taper 15 is installed on the four-axis machine tool.

[0012] During installation, the cold installation method of immersion in liquid nitrogen is adopted. First, the top seat 4 is installed into the installation cavity of the machine tool slide 13, and then two needle bearings 7 are installed into the bottom of the top seat 4, and then the thrust ball bearing 6 and angular contact ball bearing 5 are installed, and then the first sealing ring 8 is put on the top shaft. After the needle bearing 7, thrust ball bearing 6 and angular contact ball bearing 5 are heated up, the cooled top shaft 1 is installed into the top seat 4 to ensure that the bottom surface of the first column section 121 is in close contact with the top surface of the angular contact bearing, and then the second sealing ring 9 is put on the end cover, and the end cover 2 is squeezed into the top seat 4, and then the hexagon socket bolt 3 is installed to lock the end cover 2 with the top seat 4, and then the plug 10 is installed and gently screwed on. If the top is used for a four-axis machine tool, the bottom of the assembled top is connected to the four-axis Morse cone 15. The four-axis machine tool has a self-locking function, which can automatically lock the four-axis Morse cone 15. This is a prior art and will not be elaborated here. During the installation process, grease needs to be applied inside the top seat 4 and on the needle bearing 7, the thrust ball bearing 6, the angular contact ball bearing 5, the first sealing ring 8, and the second sealing ring 9.

[0013] When in use, the tooth surface pressing block 14 of the plug 11 is pressed against the plane at the center hole of the blade. The extremely high friction and bite force of the tooth surface pressing block 14 can achieve stable positioning of the blade, and can also be used for processing and positioning of other workpieces with flat end faces.

Claims

1. A special tool for a flat-head center, comprising a center shaft, the center shaft is installed in a center seat, the center seat is installed in a mounting cavity of a machine tool slide, and the two are connected by screws, and the shape of the mounting cavity of the machine tool slide matches the shape of the center seat; characterized in that: The top spindle includes an axle body and a plug, the top surface of the plug is a plane, and a tooth surface pressure block is fixedly installed on the top surface of the plug; the axle body includes three sections of cylinders with decreasing radius from top to bottom, namely the first column section, the second column section, and the third column section, and the third column section is combined with the top spindle seat, and a thrust ball bearing and a needle roller bearing are mounted on the outside from top to bottom; the second column section is combined with the top spindle seat, and a pair of angular contact ball bearings are mounted on the outside from top to bottom, and an end cover is pressed on the upper end surface of the outer ring of the upper angular contact ball bearing, and the end cover is mounted on the outside of the first column section, and a first sealing ring is arranged at the combination of the end cover and the first column section, and a second sealing ring is arranged at the combination of the end cover and the top spindle seat, and the needle roller bearing, the thrust ball bearing, and the angular contact ball bearing are used to prevent radial displacement of the top spindle.

2. A tooling for flat-top centers according to claim 1, characterized in that: The bottom end cover of the shaft body is provided with a plug.

3. A tooling for flat-top centers according to claim 2, characterized in that: The plug and the end cover are used to prevent the compression needle bearing, the thrust ball bearing and the angular contact ball bearing from axial displacement when they are subjected to force.

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