Air static pressure main shaft for machining

Abstract

The utility model belongs to the technical field of aerostatic spindles, and particularly relates to an aerostatic spindle for machining, which comprises a spindle body, an air bearing connected to the middle of the spindle body, an air injection pipe connected to the right side of the outer surface of the air bearing, an extrusion block mounted at the top of the spindle body, and sliders mounted on the left and right sides of the bottom of the extrusion block. A feeding groove is formed in the position, close to the top, of the outer surface of the spindle body, a containing groove is formed in the bottom of the feeding groove, a flow guide groove is formed in the middle of the bottom face of the containing groove, and lubricating grooves are formed in the left and right sides of the bottom of the flow guide groove. According to the air static pressure main shaft for machining, a lubricating oil block wrapped by a wax block can be placed in the containing groove through the feeding groove, the wax block is melted through heat generated by high-speed rotation of the main shaft body, lubricating oil enters the lubricating groove along with the flow guide groove, and the melted lubricating oil is guided into a gap between the air bearing and the main shaft body through the lubricating groove through centrifugal force; therefore, abrasion caused when the spindle body makes contact with the inner wall of the air bearing is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air static pressure spindles, in particular to an air static pressure spindle for processing. Background Art

[0002] At present, the high-speed spindles of precision micro-cutting machine tools mainly include magnetic suspension electric spindles, liquid dynamic and static pressure electric spindles, and gas suspension electric spindles. Magnetic suspension electric spindles are supported by magnetic suspension bearings; liquid dynamic and static pressure electric spindles are supported by liquid dynamic and static pressure bearings; and gas suspension electric spindles are supported by gas static pressure bearings.

[0003] The magnetic levitation electric spindle has a complex mechanical structure, high cost, strict environmental requirements, and is difficult to use; the liquid dynamic and static pressure electric spindle has liquid friction, large driving power loss, and difficult to control temperature rise and thermal deformation; the gas levitation electric spindle has low load-bearing capacity and high process requirements.

[0004] As disclosed in Chinese patent CN212217108U, an ultra-precision micro-machined air static pressure main shaft is provided with a housing and a shaft body, and a first air static pressure radial bearing, a positioning sleeve, a second air static pressure radial bearing and an air static pressure thrust bearing are arranged on the shaft body from left to right in sequence. The right end of the shaft body is threadedly connected to the turbine, and a housing is arranged outside the first air static pressure radial bearing, the positioning sleeve, the second air static pressure radial bearing and the air static pressure thrust bearing. A plurality of air inlet holes are provided at the right end of the housing corresponding to the turbine; a single circle of radially equidistant air inlet holes are provided at the right end of the housing to drive the turbine, providing uniform and continuous power for the rotation of the turbine. At the same time, an exhaust hole facing the turbine is provided on the end face of the rear end cover of the air static pressure main shaft to exhaust, thereby reducing the mixed flow of the air inlet and the air inlet of the air intake hole and the air in the exhaust hole, reducing the air flow loss, and adopting a radial flow turbine to make the rotation of the air static pressure main shaft more stable and the torque further increased.

[0005] However, in the prior art, the air static pressure spindle utilizes an air film to prevent contact between the shaft and the bearing during use. However, during the process of decelerating the spindle after use, due to the reduction of the injected air flow, the spindle may come into contact with the bearing during the deceleration process, thereby causing collision and friction between the shafts, which may easily damage the shafts.

[0006] For this reason, we urgently need to provide an air static pressure spindle for processing. Utility Model Content

[0007] The purpose of the utility model is to provide an air static pressure spindle for processing, so as to solve the problem that in the prior art proposed in the above-mentioned background technology, the air static pressure spindle uses an air film to prevent contact between the shaft and the bearing during use, but in the process of decelerating it after use, due to the reduction of the injected air flow, it will come into contact with the bearing during the deceleration process, thereby causing collision and friction between the shafts, which is easy to cause damage to the shaft.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solution: an air static pressure spindle for processing, comprising a spindle body, an air bearing connected to the middle of the spindle body, an air injection pipe connected to the right side of the outer surface of the air bearing, an extrusion block installed on the top of the spindle body, and sliders installed on the left and right sides of the bottom of the extrusion block.

[0009] Preferably, an annular air chamber is provided in the middle of the air bearing, and air pressure grooves are provided on the left and right sides of the top of the annular air chamber and on the left and right sides of the top.

[0010] Preferably, a feed groove is provided on the outer surface of the main shaft body near the top, a placement groove is provided at the bottom of the feed groove, a guide groove is provided in the middle of the bottom surface of the placement groove, and lubrication grooves are provided on the left and right sides of the bottom of the guide groove.

[0011] Preferably, a slot is provided on the top surface of the main shaft body, and sliding grooves are provided on the left and right sides of the bottom of the slot.

[0012] Preferably, the inside of the annular air chamber is connected to the inside of the air inlet pipe opened in the middle of the air injection pipe, and the inside of the air pressure groove is connected to the middle of the outer surface of the main shaft body. The air flow blown out of the air pressure groove will enter the gap formed by the outer surface of the main shaft body and the inner wall of the air bearing.

[0013] Preferably, the interior of the feed groove is connected to the interior of the placement groove, the placement groove is connected to the interior of the guide groove, the guide groove is connected to the interior of the lubrication groove, and the interior of the lubrication groove is connected to the gap formed between the inner wall of the air bearing and the outer surface of the main shaft body.

[0014] Preferably, the inside of the slot is slidably connected to the outer surface of the extrusion block, and the inner wall of the slide is slidably connected to the outer surface of the slider. When the main shaft body rotates, the centrifugal force can be used to make the extrusion block and the slider slide inside the slot and the slide, so that the extrusion block and the slider slide outward from the center of the main shaft body.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The air static pressure spindle used for processing can place a lubricating oil block wrapped in a wax block into the placement groove through a feed groove, and melt the wax block by using the heat generated by the high-speed rotation of the spindle body. The lubricating oil enters the lubrication groove along the guide groove, and the lubricating groove guides the melted lubricating oil into the gap between the air bearing and the spindle body through centrifugal force, thereby effectively reducing the wear when the spindle body contacts the inner wall of the air bearing.

[0017] 2. The air static pressure spindle used for processing has a sliding connection between the inside of the card slot and the extrusion block, and a sliding connection between the inside of the slide slot and the slider. When the spindle body rotates, the centrifugal force can be used to offset the extrusion block and the slider. The offset force enables the extrusion block to clamp and fix external structures such as workpieces or clamping tools connected to the spindle body, thereby further improving the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure appearance of the utility model;

[0019] Figure 2 It is a front structural sectional view of the utility model;

[0020] Figure 3 It is a side structural sectional view of the utility model;

[0021] Figure 4 It is a top cross-sectional view of the middle structure of the utility model;

[0022] Figure 5 It is an enlarged view of the clamping structure of the utility model.

[0023] In the figure: 1. spindle body; 101. air injection pipe; 102. air bearing; 103. extrusion block; 104. slider; 1021. annular air chamber; 1022. air pressure groove; 1011. feed groove; 1012. placement groove; 1013. guide groove; 1014. lubrication groove; 1031. card groove; 1032. slide groove. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-Figure 5 , the utility model provides a technical solution:

[0026] An air static pressure spindle for processing includes a spindle body 1, an air bearing 102 is connected to the middle of the spindle body 1, an air injection pipe 101 is connected to the right side of the outer surface of the air bearing 102, an extrusion block 103 is installed on the top of the spindle body 1, and sliders 104 are installed on the left and right sides of the bottom of the extrusion block 103.

[0027] The air bearing 102 has an annular air chamber 1021 in the middle, and air pressure grooves 1022 are provided on the left and right sides of the top of the annular air chamber 1021. The inside of the annular air chamber 1021 is connected to the inside of the air inlet pipe in the middle of the air injection pipe 101, and the inside of the air pressure groove 1022 is connected to the middle of the outer surface of the main shaft body 1.

[0028] A feed groove 1011 is provided near the top of the outer surface of the spindle body 1, a placement groove 1012 is provided at the bottom of the feed groove 1011, a guide groove 1013 is provided in the middle of the bottom surface of the placement groove 1012, and lubrication grooves 1014 are provided on the left and right sides of the bottom of the guide groove 1013. The inside of the feed groove 1011 is connected to the inside of the placement groove 1012, the placement groove 1012 is connected to the inside of the guide groove 1013, the guide groove 1013 is connected to the inside of the lubrication groove 1014, and the inside of the lubrication groove 1014 is connected to the gap formed between the inner wall of the air bearing 102 and the outer surface of the spindle body 1.

[0029] The top surface of the main shaft body 1 is provided with a slot 1031, and the bottom left and right sides of the slot 1031 are provided with slide slots 1032. The inside of the slot 1031 is slidably connected to the outer surface of the extrusion block 103, and the inner wall of the slide slot 1032 is slidably connected to the outer surface of the slider 104.

[0030] A lubricating oil block wrapped in wax can be placed into the placement groove 1012 through the feed groove 1011, and the wax block is melted by the heat generated by the high-speed rotation of the spindle body 1. The lubricating oil enters the lubrication groove 1014 along the guide groove 1013. The lubrication groove 1014 guides the melted lubricating oil into the gap between the air bearing 102 and the spindle body 1 through centrifugal force, thereby effectively reducing the wear when the spindle body 1 contacts the inner wall of the air bearing 102.

[0031] Through the sliding connection between the inside of the slot 1031 and the extrusion block 103, and the sliding connection between the inside of the slide groove 1032 and the slider 104, when the spindle body 1 rotates, the centrifugal force can be used to offset the extrusion block 103 and the slider 104. The offset force enables the extrusion block 103 to clamp and fix external structures such as workpieces or clamping tools connected to the spindle body 1, thereby further improving the stability of the connection.

[0032] Before the spindle body 1 is used, the lubricating oil block wrapped in the wax block is placed into the bottom of the placement groove 1012 through the feed groove 1011. When the spindle body 1 is in use, the heat generated by the high-speed rotation can melt the wax block, so that the lubricating oil can be guided into the lubrication groove 1014 through the guide groove 1013. Due to the centrifugal force, it will flow through the lubrication groove 1014 to the gap between the outer surface of the spindle body 1 and the inner wall of the air bearing 102. Therefore, after the spindle body 1 completes its rotation, the contact between the outer surface of the spindle body 1 and the inner wall of the air bearing 102 is lubricated during the deceleration process, thereby reducing wear.

[0033] When processing and connecting the workpiece or the peripheral structure connected to the main shaft body 1, the auxiliary connection structure of the peripheral connection structure is placed on the side of the slot 1031 close to the outer surface of the main shaft body 1. When the main shaft body 1 rotates at high speed, it will drive the extrusion block 103 and the slider 104 to slide, thereby squeezing and fixing the workpiece or the peripheral connection part, and assisting the connection, so that the processing process can be more stable.

[0034] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. An air static pressure spindle for machining, comprising a spindle body (1), characterized in that: An air bearing (102) is connected to the middle of the main shaft body (1), an air injection pipe (101) is connected to the right side of the outer surface of the air bearing (102), an extrusion block (103) is installed on the top of the main shaft body (1), and sliding blocks (104) are installed on the left and right sides of the bottom of the extrusion block (103).

2. The air static pressure spindle for machining according to claim 1, characterized in that: An annular air chamber (1021) is provided in the middle of the air bearing (102), and air pressure grooves (1022) are provided on the left and right sides of the top of the annular air chamber (1021) and on the left and right sides of the top.

3. The air static pressure spindle for machining according to claim 1, characterized in that: A feed groove (1011) is provided on the outer surface of the main shaft body (1) near the top, a placement groove (1012) is provided at the bottom of the feed groove (1011), a guide groove (1013) is provided in the middle of the bottom surface of the placement groove (1012), and lubrication grooves (1014) are provided on the left and right sides of the bottom of the guide groove (1013).

4. The air static pressure spindle for machining according to claim 1, characterized in that: A clamping groove (1031) is provided on the top surface of the main shaft body (1), and sliding grooves (1032) are provided on the left and right sides of the bottom of the clamping groove (1031).

5. The air static pressure spindle for machining according to claim 2, characterized in that: The interior of the annular air chamber (1021) is connected to the interior of an air inlet pipe opened in the middle of the air injection pipe (101), and the interior of the air pressure groove (1022) is connected to the middle of the outer surface of the main shaft body (1).

6. The air static pressure spindle for machining according to claim 3, characterized in that: The interior of the feed groove (1011) is connected to the interior of the placement groove (1012), the placement groove (1012) is connected to the interior of the guide groove (1013), the guide groove (1013) is connected to the interior of the lubrication groove (1014), and the interior of the lubrication groove (1014) is connected to the gap formed between the inner wall of the air bearing (102) and the outer surface of the main shaft body (1).

7. The air static pressure spindle for machining according to claim 4, characterized in that: The interior of the clamping groove (1031) is slidably connected to the outer surface of the extrusion block (103), and the inner wall of the sliding groove (1032) is slidably connected to the outer surface of the sliding block (104).

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