CN217142334U - Clamping tool for turning workpiece made of cylindrical hard and brittle material - Google Patents
Clamping tool for turning workpiece made of cylindrical hard and brittle material Download PDFInfo
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- CN217142334U CN217142334U CN202220222695.8U CN202220222695U CN217142334U CN 217142334 U CN217142334 U CN 217142334U CN 202220222695 U CN202220222695 U CN 202220222695U CN 217142334 U CN217142334 U CN 217142334U
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Abstract
The invention discloses a clamping tool for a turning workpiece of a cylindrical hard and brittle material, belonging to the technical field of turning; the device comprises a first circular boss, a hexagon bolt, a second circular boss and a connector which are coaxially arranged in sequence, wherein the two circular bosses are of stepped shaft structures, are coaxially arranged at two ends of a cylindrical workpiece and are connected into a whole through the hexagon bolt; the hexagonal groove of the connecting body is coaxially sleeved on the bolt head of the hexagon bolt, and the conical groove is used for positioning the thimble. The circular bosses on the two sides of the invention respectively adopt the three-jaw chuck and the thimble to realize circumferential fixation and secondary axial compression, thereby having better connection strength and stability and reducing the jumping error of the workpiece in the processing process. The relative position of the thimble and the conical groove is quickly adjusted, so that the center of the workpiece is coaxial with the clamping surface, and the alignment efficiency is further improved; the workpiece bears larger axial force, the radial force is relatively smaller, and the problems of workpiece breakage, non-processing crack damage and the like which are possibly caused in the turning process are avoided.
Description
Technical Field
The invention belongs to the technical field of turning, and particularly relates to a clamping tool for a turning workpiece made of a cylindrical hard and brittle material.
Background
SiC f the/SiC ceramic matrix composite has the characteristics of high specific strength, high specific modulus and high temperature resistance, and has wide application prospect in the fields of aircraft engine hot end parts and the like. Domestic on SiC f The research on the preparation process of the SiC ceramic matrix composite material has made a great breakthrough, and the research on the process of the material mainly focuses on the aspects of drilling, plane processing and the like at present. The shape of the adopted material is mostly plate-shaped, and the related research and report on the rod-shaped or barrel-shaped material used for turning are less. Since SiC f The preparation process of the/SiC ceramic matrix composite is complex, the preparation period is long, the cost is high, the purchase price is high, and the test material is lack. Therefore, researchers are dealing with SiC f The use of SiC ceramic matrix composites is very prudent.
In the turning of a rod-shaped workpiece, the workpiece is clamped and positioned firstly, and a three-jaw chuck is mostly adopted to clamp one end of the workpiece by a common clamping method so as to ensure radial positioning and clamping; the other end is pressed by a thimble along the axial direction. A small-size cylindrical workpiece is usually turned by clamping one end of the workpiece by a three-jaw chuck and suspending the other end of the workpiece. However, a cylindrical workpiece of a large size is not suitable for such a method. The clamping jaw clamping part is short, the suspended part is long, and the other end of the workpiece cannot be pressed by the ejector pin. During the turning process, the workpiece may be broken and flown due to overlarge radial force, so that the workpiece is damaged, and the processing safety is greatly influenced. Due to overlarge radial force, the center of the workpiece is not concentric with the clamping surface easily, and large jump is generated in the machining process, so that the size and shape precision of the workpiece are influenced.
For cylindrical workpieces, researchers also design a full mandrel for clamping, but for cylindrical workpieces with larger sizes, the dead weight and the size of the full mandrel are large, so that clamping is not facilitated. Cylindrical SiC f The SiC ceramic matrix composite has the characteristics of high hardness and high strength, but the SiC ceramic matrix composite has small wall thickness, high cost and scarce materials, and a proper auxiliary tool needs to be designed for clamping and positioning.
Disclosure of Invention
The technical problem to be solved is as follows:
in order to avoid the defects of the prior art, the SiC ceramic tube is made of cylindrical SiC with larger size (the outer diameter is 100-200 mm, the length is 200-300 mm, and the wall thickness is 5-10 mm) and the shape of the SiC ceramic tube f The invention provides a cylindrical SiC ceramic matrix composite workpiece clamping tool for turning a cylindrical hard and brittle material, which solves the problems of workpiece damage or breakage caused by overlarge radial stress, overlarge dead weight and size caused by a full mandrel and the like in ultrasonic vibration assisted turning of a SiC ceramic matrix composite workpiece f The SiC ceramic matrix composite material, the three-jaw chuck and the ejector pin are connected, wherein the first circular boss is directly clamped by the three-jaw chuck in the circumferential direction, and one side of the connector is axially compressed by the ejector pin. The three-jaw chuck, the two circular bosses, the cylindrical workpiece, the bolt, the cylinder with the groove and the ejector pin are coaxial. The tool structure reduces the problems of dead weight and overlarge size caused by the full mandrel tool, and enables the workpiece to bear larger force in the axial direction and bear relatively smaller force in the radial direction. This advantageously reduces radial deformation of the cylindrical workpiece directly clamped in the three-jaw chuck, avoiding possible introductionThe hidden danger of workpiece damage and even scrap is raised. The coaxiality of the cylindrical workpiece and the clamping surface is judged according to the relative position of the thimble and the conical groove of the connecting body, so that the center of the workpiece is quickly positioned.
The technical scheme of the invention is as follows: the utility model provides a hard brittle material lathe work piece clamping frock of tube-shape which characterized in that: the device comprises a first circular boss, a hexagon bolt, a second circular boss and a connector which are coaxially arranged in sequence, wherein the two circular bosses are of stepped shaft structures, are coaxially arranged at two ends of a cylindrical workpiece and are connected into a whole through the hexagon bolt;
the small-diameter end of the first circular boss is coaxially inserted into one end of the cylindrical workpiece and is in interference fit with the cylindrical workpiece; the large-diameter end is used as a base and is circumferentially clamped through a three-jaw chuck; a threaded hole is formed in the end face of the small-diameter end of the first circular boss along the central shaft;
the small-diameter end of the second circular boss is coaxially inserted into the other end of the cylindrical workpiece and is in interference fit with the small-diameter end of the cylindrical workpiece; the large-diameter end is positioned at the outer side and faces the thimble;
the screw rod of the hexagon bolt passes through the central hole of the second circular boss and is installed in a matching way with the threaded hole of the first circular boss, so that the first circular boss, the hexagon bolt and the second circular boss are integrally and coaxially connected;
the connector is of a columnar structure, a hexagonal groove is formed in the center of one end face of the connector, and the connector is coaxially sleeved on a bolt head of a hexagon bolt; the center of the other end surface is provided with a conical groove for coaxially positioning the thimble.
The further technical scheme of the invention is as follows: the diameter of the large-diameter end of the first circular boss is 1.2-1.5 times of the diameter of the small-diameter end; the axial height of the large-diameter end is 5-10 mm greater than the maximum clamping height of the clamping jaw of the three-jaw chuck.
The further technical scheme of the invention is as follows: the axial length of the small-diameter end of the first circular boss is 1/3-1/2 of the axial length of the cylindrical workpiece.
The further technical scheme of the invention is as follows: the diameter of the large-diameter end of the second circular boss is 1.0-1.1 times of the diameter of the small-diameter end.
The further technical scheme of the invention is as follows: the axial height of the small-diameter end of the second circular boss is 10-20 mm.
The further technical scheme of the invention is as follows: the center hole of the second circular boss is of a counter bore structure, and the inner peripheral surface of the second circular boss is provided with internal threads; the diameter of the large-diameter end outside the counter bore is 1.2-1.5 times of the diameter of the bolt head circumscribed circle of the hexagon bolt.
The further technical scheme of the invention is as follows: the axial height of the bolt head of the hexagon bolt is 10-20 mm; the diameter of the screw is 1/5 of the inner diameter of the cylindrical workpiece, and the root of the screw is an external thread which is matched and arranged with the internal thread of the second circular boss.
The further technical scheme of the invention is as follows: the connector is a cylinder, the depth of the conical groove of the connector is 5mm, and the taper of the conical groove is 1 degree.
Advantageous effects
The invention has the beneficial effects that: the invention discloses a cylindrical hard and brittle material turning workpiece clamping tool, which is used for cylindrical SiC f The turning processing is assisted to the supplementary ultrasonic vibration of/SiC ceramic matrix composite, adopts the structure of the integrative coaxial coupling of first circular boss, hex bolts, the circular boss of second to have alleviateed dead weight and the oversize problem that full dabber structure brought, simple structure, and the preparation is convenient, can accomplish the installation fast. Two circular bosses and a workpiece are axially connected and compressed through a self-designed hexagon bolt.
The circular bosses on the two sides are circumferentially fixed and axially compressed for the second time by adopting a three-jaw chuck and a thimble respectively. The clamping tool has good connection strength and stability, and the jumping error of a workpiece in the machining process is reduced. The relative position of the thimble and the conical groove is quickly adjusted, so that the center of the workpiece is coaxial with the clamping surface, and the alignment efficiency is further improved.
The main principle of the tool is axial positioning, pressing and circumferential fixing of the workpiece, the designed structure enables the workpiece to bear larger axial force, the radial stress is relatively smaller, and the problems of workpiece breakage, non-processing crack damage and the like which possibly occur in the turning process are avoided.
Drawings
FIG. 1 is a schematic view of a clamping tool for turning a cylindrical hard and brittle material workpiece according to the invention;
FIG. 2 is a schematic view of a turning force-measuring auxiliary device used in cooperation with the turning workpiece clamping tool of the invention;
FIG. 3 is a schematic view of the structure of two circular bosses of the present invention; (a) is a schematic view of a first circular boss structure, (b) is a schematic view of a second circular boss structure;
FIG. 4 is a schematic structural view of a hexagon bolt according to the present invention;
fig. 5 is a schematic size diagram of a cylinder with hexagonal, conical indentations according to the present invention.
Description of reference numerals: 1-a numerically controlled lathe three-jaw chuck, 2-a first circular boss, 3-a hexagon bolt, 4-a second circular boss, 5-a connecting cylinder and 6-a numerically controlled lathe thimble.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
As shown in figure 1, the clamping tool for turning the cylindrical hard and brittle material workpiece is applied to cylindrical SiC with larger size f The turning processing of the/SiC ceramic matrix composite comprises a three-jaw chuck 1, a first circular boss 2, a hexagon bolt 3, a second circular boss 4, a connecting cylinder 5 and a thimble 6 of a numerical control lathe;
the cylindrical SiC f The size of the/SiC ceramic matrix composite workpiece is phi 100 multiplied by 200mm, and the wallThe thickness is 6 mm.
The first circular boss 2 and the second circular boss 4 are both of stepped shaft structures and are arranged on cylindrical SiC f The diameter of the small-diameter end of each of the two ends of the/SiC ceramic matrix composite workpiece is equal to the inner diameter of the workpiece and is 88mm, so that the two ends are well connected together along the axial direction.
The 3-specification nominal diameter of the self-designed hexagon bolt is 16mm and is used for connecting a workpiece and two circular bosses. The cross section of the bolt head is a hexagon with the diameter of an inscribed circle being 24mm and the height being 15 mm. The thread section has the major diameter of 16mm, the length of 38mm and the thread pitch of 1.5 mm. Wherein the length of the screw is 164 mm. Through the hexagon bolt of design, couple together first circular boss 2, tube-shape work piece, second circular boss 4 and connecting cylinder 5 along the axial, guarantee that its axis is on same straight line to have better joint strength.
The first circular boss 2 is close to one side of the three-jaw chuck 1, and the large-diameter end of the first circular boss is used as a base and is circumferentially clamped by the three-jaw chuck. The diameter of the base is 110mm, and the height is 40 mm. The height of the base is larger than the maximum height which can be clamped by the clamping jaw, so that the collision between the cutter and the clamping jaw during cutting can be avoided. The small diameter end has an axial length of 100mm and is provided with a threaded hole having a length of 38mm at a position close to the center of the inner side of the workpiece. On the basis of ensuring the matching property of the internal thread and the external thread, the internal thread is processed.
The second circular boss 4 is designed to have a diameter of 93mm and a height of 15mm as a base in order to achieve turning from the end face and to retain the necessary machinable thickness on the side away from the three-jaw chuck 1. Wherein, the axial length of the small diameter end is 20 mm. The second circular boss 4 is provided with a through bolt hole along the central axis, and the diameter of the bolt hole is 16 mm. The base is provided with a counter bore structure, and the diameter of a large hole is 40 mm.
The connecting cylinder 5 is provided with a hexagonal and conical groove, and the diameter of the bottom surface of the cylinder is 40 mm. Due to the addition of the force measuring tool shown in fig. 2, the thimble cannot be aligned with the tool tip. The length of the designed cylinder is larger than the axial distance between the thimble and the tool nose, and is selected to be 100mm, so that the thimble is in close contact with the conical groove. The first groove of the cylinder is hexagonal, the diameter of the inscribed circle is 24mm, and the depth is 20 mm; the second is a tapered groove with a depth of 5mm and a groove taper of 1.
Preferably, the three-jaw chuck is a three-jaw chuck on a CY-K410 numerical control lathe.
Preferably, the ejector pin is an ejector pin on a CY-K410 numerical control lathe, and the taper is 1.
Preferably, the two circular bosses, the bolts, the cylinders and the like are processed by adopting a 'matched lathe'.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. The utility model provides a hard brittle material lathe work piece clamping frock of tube-shape which characterized in that: the device comprises a first circular boss, a hexagon bolt, a second circular boss and a connector which are coaxially arranged in sequence, wherein the two circular bosses are of stepped shaft structures, are coaxially arranged at two ends of a cylindrical workpiece and are connected into a whole through the hexagon bolt;
the small-diameter end of the first circular boss is coaxially inserted into one end of the cylindrical workpiece and is in interference fit with the cylindrical workpiece; the large-diameter end is used as a base and is circumferentially clamped through a three-jaw chuck; a threaded hole is formed in the end face of the small-diameter end of the first circular boss along the central shaft;
the small-diameter end of the second circular boss is coaxially inserted into the other end of the cylindrical workpiece and is in interference fit with the small-diameter end of the cylindrical workpiece; the large-diameter end is positioned at the outer side and faces the thimble;
the screw rod of the hexagon bolt passes through the central hole of the second circular boss and is installed in a matching way with the threaded hole of the first circular boss, so that the first circular boss, the hexagon bolt and the second circular boss are integrally and coaxially connected;
the connector is of a columnar structure, a hexagonal groove is formed in the center of one end face of the connector, and the connector is coaxially sleeved on a bolt head of a hexagon bolt; the center of the other end surface is provided with a conical groove for coaxially positioning the thimble.
2. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 1, characterized in that: the diameter of the large-diameter end of the first circular boss is 1.2-1.5 times of the diameter of the small-diameter end; the axial height of the large-diameter end is 5-10 mm greater than the maximum clamping height of the clamping jaw of the three-jaw chuck.
3. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 2, characterized in that: the axial length of the small-diameter end of the first circular boss is 1/3-1/2 of the axial length of the cylindrical workpiece.
4. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 1, characterized in that: the diameter of the large-diameter end of the second circular boss is 1.0-1.1 times of the diameter of the small-diameter end.
5. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 4, wherein the clamping tool comprises: the axial height of the small-diameter end of the second circular boss is 10-20 mm.
6. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 1, characterized in that: the center hole of the second circular boss is of a counter bore structure, and the inner peripheral surface of the second circular boss is provided with internal threads; the diameter of the large-diameter end outside the counter bore is 1.2-1.5 times of the diameter of the bolt head circumscribed circle of the hexagon bolt.
7. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 1, characterized in that: the axial height of the bolt head of the hexagon bolt is 10-20 mm; the diameter of the screw is 1/5 of the inner diameter of the cylindrical workpiece, and the root of the screw is an external thread which is matched and arranged with the internal thread of the second circular boss.
8. The cylindrical hard and brittle material turning workpiece clamping tool as claimed in claim 1, characterized in that: the connector is a cylinder, the depth of the conical groove of the connector is 5mm, and the taper of the conical groove is 1 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220222695.8U CN217142334U (en) | 2022-01-27 | 2022-01-27 | Clamping tool for turning workpiece made of cylindrical hard and brittle material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220222695.8U CN217142334U (en) | 2022-01-27 | 2022-01-27 | Clamping tool for turning workpiece made of cylindrical hard and brittle material |
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| Publication Number | Publication Date |
|---|---|
| CN217142334U true CN217142334U (en) | 2022-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220222695.8U Active CN217142334U (en) | 2022-01-27 | 2022-01-27 | Clamping tool for turning workpiece made of cylindrical hard and brittle material |
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| Country | Link |
|---|---|
| CN (1) | CN217142334U (en) |
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- 2022-01-27 CN CN202220222695.8U patent/CN217142334U/en active Active
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