CN214559224U - Double-positioning nut structure for numerical control lathe - Google Patents
Double-positioning nut structure for numerical control lathe Download PDFInfo
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- CN214559224U CN214559224U CN202120689463.9U CN202120689463U CN214559224U CN 214559224 U CN214559224 U CN 214559224U CN 202120689463 U CN202120689463 U CN 202120689463U CN 214559224 U CN214559224 U CN 214559224U
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Abstract
The utility model provides a two set nut structures for numerical control lathe, includes the main shaft axle core, the main shaft axle core passes through the front bearing end cover to be fixed in the headstock, is provided with main shaft adapter and three chucks in the main shaft axle core, its characterized in that: the spindle shaft core is provided with a double-positioning nut, the inner edge of the double-positioning nut is sequentially provided with a thread, a tool withdrawal groove, a radial positioning inner diameter and a positioning end face, the thread is in threaded fit with the spindle shaft core, the radial positioning inner diameter is in clearance fit with the spindle shaft core, the fit clearance is 5-6 microns, the outer diameter of the double-positioning nut is provided with a first wrench position, the positioning end face is provided with a second wrench position, the first wrench position and the second wrench position are circular hole positions, and the tail parts of the three clamping heads are provided with spring nuts.
Description
Technical Field
The invention relates to the field of numerical control machine tools, in particular to a double-positioning nut structure for a numerical control lathe.
Background
In a lathe adopting a forward-push type spindle mechanism, a locknut at the front end of a spindle has the function of ensuring that a bar clamped by a chuck can be kept stable when the chuck is closed. The higher the perpendicularity between the end face of the lock nut and the axis is, the more the precision and consistency of the machined workpiece are ensured. In order to meet the requirement of high-precision machining operation, the perpendicularity between the locking nut and the axis of the spindle often needs to reach the micron level. At present, the locking nut and the spindle are connected by threads, and the end surface of the locking nut and the end surface of the spindle chuck are axially positioned by complete contact. However, due to the limitation of the thread machining process, a gap inevitably exists between the locking nut and the spindle in the radial direction, the existence of the gap not only directly affects the fastening degree of the nut, but also affects the verticality between the nut and the spindle axis, and when the gap is too large, the requirement of high-precision machining is difficult to guarantee. In addition, the excessive clearance also makes the metal bits that produce in the processing more easily enter into the main shaft inner chamber, and the normal switching of chuck is often caused to the bits of accumulation to influence.
Disclosure of Invention
The utility model aims at overcoming the defect and not enough that exist among the prior art, provide a simple structure, have dual locate function's a two set nut structure for numerical control lathe.
In order to achieve the above purpose, the technical solution of the utility model is that: the utility model provides a two set nut structures for numerical control lathe, includes the main shaft axle core, the main shaft axle core passes through the front bearing end cover to be fixed in the headstock, is provided with main shaft adapter and three chucks in the main shaft axle core, its characterized in that: the spindle shaft core is provided with a double-positioning nut, the inner edge of the double-positioning nut is sequentially provided with a thread, a tool withdrawal groove, a radial positioning inner diameter and a positioning end face, the thread is in threaded fit with the spindle shaft core, the radial positioning inner diameter is in clearance fit with the spindle shaft core, the fit clearance is 5-6 microns, the outer diameter of the double-positioning nut is provided with a first wrench position, the positioning end face is provided with a second wrench position, the first wrench position and the second wrench position are circular hole positions, and the tail parts of the three clamping heads are provided with spring nuts.
And the outer surface of the double-positioning nut is provided with an elastic mark.
The radial positioning inner diameter and the positioning end face of the double-positioning nut are formed by one-time clamping, positioning and grinding.
Compared with the prior art, the utility model, following beneficial effect has:
1. in the design, the spindle core is provided with the double positioning nuts, the spindle adapter is forced by the internal thrust of the spindle system to radially clamp the bars by the three clamping heads, the clamping precision requirement of the three clamping heads on the workpiece is extremely high, the clamping precision directly influences the jumping of the outer diameter of the material, and the concentric roundness requirement of the workpiece is directly influenced if the material jumping is not good. The double-positioning nut is used in the design, because the three chucks need end face positioning and radial stress in the main shaft to force the chucks to clamp the bar material according to elastic deformation, the positioning of the three chucks is matched with the positioning precision through the locking of the threads of the double-positioning nut, the radial positioning inner diameter and the positioning end face, and the vertical requirement of the positioning end face and the main shaft core can be maintained, so that the three chucks can maintain the uniformity of the outer diameter of the material in the clamping process.
2. The three clamping heads still have clamping gaps when clamping the bar, so that slag, oil and dirt are inevitably introduced into the inner cavity of the main shaft in the machining process, and the double-positioning nut is provided with a first wrench position and a second wrench position, so that the wrench is convenient to adjust; the second wrench position on the positioning end face also serves as a chip removal port, and during high-speed rotation of the spindle, due to the influence of centrifugal force, the chips entering the inner cavity of the spindle are removed through the second wrench position, so that the spindle adapter can move back and forth in the spindle core.
3. The elasticity that two set nut surfaces set up the nut in this design marks, makes things convenient for the operator to discern the elasticity direction of screw thread.
4. The radial positioning inner diameter and the positioning end face of the double positioning nut in the design are formed by one-time clamping, positioning and grinding, so that the position precision between the positioning end face and the radial positioning inner diameter can meet the requirement.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of a middle double positioning nut of the present invention;
fig. 3 is a rear view of fig. 2.
In the figure: the double-positioning nut comprises a double-positioning nut 1, a radial positioning inner diameter 101, a positioning end face 102, a thread 103, a tightness mark 104, a second wrench position 105, a first wrench position 106, a tool withdrawal groove 107, a spindle shaft core 2, a three-piece chuck 3, a spindle adapter 4, a spring nut 5 and a front bearing end cover 6.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 3, a double-positioning nut structure for a numerically controlled lathe includes a spindle core 2, the spindle core 2 is fixed in a spindle box through a front bearing end cover 6, and a spindle adapter 4 and three chucks 3 are arranged in the spindle core 2, which is characterized in that: the double-positioning-nut spindle comprises a spindle shaft core 2 and is characterized in that a double-positioning nut 1 is arranged on the spindle shaft core 2, a thread 103, a tool withdrawal groove 107, a radial positioning inner diameter 101 and a positioning end face 102 are sequentially arranged on the inner edge of the double-positioning nut 1, thread fit is formed between the thread 103 and the spindle shaft core 2, clearance fit is formed between the radial positioning inner diameter 101 and the spindle shaft core 2, the fit clearance is 5-6 micrometers, a first wrench position 106 is arranged on the outer diameter of the double-positioning nut 1, a second wrench position 105 is arranged on the positioning end face 102, the first wrench position 106 and the second wrench position 105 are circular hole positions, and a spring nut 5 is arranged at the tail of three chucks 3.
The outer surface of the double-positioning nut 1 is provided with a tightness mark 104.
The radial positioning inner diameter 101 and the positioning end face 102 of the double-positioning nut 1 are formed by one-time clamping, positioning and grinding.
In the design, a double-positioning nut 1 is arranged on a spindle core 2, a spindle adapter 4 is forced by the internal thrust of a spindle system to radially clamp three chucks 3 on a bar, the clamping precision requirements of the three chucks 3 on a workpiece are extremely high, the clamping precision directly influences the jumping of the outer diameter of a material, and the concentric roundness requirements of the workpiece are directly influenced due to poor jumping of the material. The double-positioning nut 1 is used in the design, as the three chucks 3 need end face positioning and radial stress in the main shaft to force the chucks to clamp the bar material according to elastic deformation, the positioning of the three chucks 3 is locked by the threads 103 of the double-positioning nut 1, the radial positioning inner diameter 101 and the positioning end face 102 are matched with orientation precision, the vertical requirement of the positioning end face 102 and the main shaft core 2 is maintained, and thus the three chucks 3 can maintain the uniformity of the outer diameter of the material in the clamping process. The three clamping heads 3 still have clamping gaps when clamping the bar, so that slag, oil and dirt are inevitably generated in the process of machining and enter the inner cavity of the main shaft, and the first wrench position 106 and the second wrench position 105 are arranged on the double-positioning nut 1, so that the adjustment of a wrench is facilitated; the second wrench position 105 on the positioning end face 102 also serves as a chip removal port, and during high-speed rotation of the spindle, due to the influence of centrifugal force, the chips entering the inner cavity of the spindle are removed through the second wrench position 105, so that the spindle adapter 4 can move back and forth in the spindle core 2. In the design, the tightness mark 104 of the nut is arranged on the outer surface of the double-positioning nut 1, so that an operator can conveniently identify the tightness direction of the thread. In the design, the radial positioning inner diameter 101 and the positioning end face 102 of the double-positioning nut 1 are formed by one-time clamping, positioning and grinding, so that the position precision between the positioning end face 102 and the radial positioning inner diameter 101 can meet the requirement. The utility model discloses simple structure, have dual locate function.
Claims (3)
1. The utility model provides a two set nut structures for numerical control lathe, includes main shaft axle core (2), main shaft axle core (2) are fixed in the headstock through front bearing end cover (6), are provided with main shaft adapter (4) and three chuck (3), its characterized in that in main shaft axle core (2): the novel spindle is characterized in that a double-positioning nut (1) is arranged on a spindle shaft core (2), threads (103), a tool withdrawal groove (107), a radial positioning inner diameter (101) and a positioning end face (102) are sequentially arranged on the inner edge of the double-positioning nut (1), thread fit is formed between the threads (103) and the spindle shaft core (2), clearance fit is formed between the radial positioning inner diameter (101) and the spindle shaft core (2), the fit clearance is 5-6 micrometers, a first wrench position (106) is arranged on the outer diameter of the double-positioning nut (1), a second wrench position (105) is arranged on the positioning end face (102), the first wrench position (106) and the second wrench position (105) are circular hole positions, and spring nuts (5) are arranged at the tail parts of three chucks (3).
2. The double positioning nut structure for the numerically controlled lathe according to claim 1, wherein: the outer surface of the double-positioning nut (1) is provided with an elastic mark (104).
3. The double positioning nut structure for the numerically controlled lathe according to claim 1, wherein: the radial positioning inner diameter (101) and the positioning end face (102) of the double-positioning nut (1) are formed by one-time clamping, positioning and grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120689463.9U CN214559224U (en) | 2021-04-06 | 2021-04-06 | Double-positioning nut structure for numerical control lathe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120689463.9U CN214559224U (en) | 2021-04-06 | 2021-04-06 | Double-positioning nut structure for numerical control lathe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214559224U true CN214559224U (en) | 2021-11-02 |
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ID=78357491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120689463.9U Active CN214559224U (en) | 2021-04-06 | 2021-04-06 | Double-positioning nut structure for numerical control lathe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214559224U (en) |
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2021
- 2021-04-06 CN CN202120689463.9U patent/CN214559224U/en active Active
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