CN209831431U - Precision core expansion clamp based on zero clearance fit - Google Patents
Precision core expansion clamp based on zero clearance fit Download PDFInfo
- Publication number
- CN209831431U CN209831431U CN201920636342.0U CN201920636342U CN209831431U CN 209831431 U CN209831431 U CN 209831431U CN 201920636342 U CN201920636342 U CN 201920636342U CN 209831431 U CN209831431 U CN 209831431U
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- key
- positioning key
- positioning
- clearance fit
- limiting ring
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Abstract
The utility model relates to an accurate core anchor clamps that expand based on zero clearance fit, its characterized in that: 3 guide grooves with the width equal to that of the positioning key and required by clearance fit with the positioning key are uniformly distributed on the mandrel body, the bottom surface of each guide groove is provided with a 3-6-degree oblique angle with self-locking property, the positioning key is provided with a counter bore, a spiral spring is arranged in the counter bore of the positioning key and is also arranged in the key groove of the limiting ring, the height direction of the spiral spring props against the bottom of the key groove of the limiting ring, the width direction of the positioning key is in clearance fit with the key groove of the limiting ring, and the spiral spring tightly presses the positioning key at the bottom of the guide groove of the mandrel body. The device has the advantages of simple and compact structure, accurate positioning, rapidness, convenience and low cost, and not only can improve the production efficiency, but also can better ensure the precision of the product.
Description
Technical Field
The utility model relates to an accurate core anchor clamps that expand based on zero clearance fit belongs to the machining field.
Background
At present, many parts (such as rings, sleeves and gears) are often subjected to hole positioning in the processing and inspection processes, and the used positioning elements are often positioning pins or positioning shafts. The fit clearance between the positioning pin shaft and the hole is often the largest source of installation error, which causes the reduction of positioning accuracy. Therefore, various process equipment designed based on zero-gap positioning are in operation. People firstly think of eliminating the clearance by interference fit, and the compact structure and the structure integrating positioning and clamping overcomes the defects, but has the problems of inconvenient assembly and disassembly and scratching of the positioning surface of the workpiece in the process of inserting and pulling the pin. Various core expansion positioning mechanisms are available, but these products often have one or the other problems, such as:
firstly, expanding blocks: the adjusting range is large, and the device basically belongs to a clamping jaw type positioning and clamping device. The defects are that the mechanism is complex, the volume is large and the precision is not high.
Secondly, adjustable hydraulic pressure type: high precision, but also large volume, and the need to inject mineral oil. The manufacturing cost and the maintenance cost are high. Adjustable claw type: the disadvantage is similar to the first. Fourthly, expanding sleeve type: high precision, large volume, complex mechanism and high process cost.
There are also problems such as a disk spring leaf mandrel, a liquid media resilient mandrel, a bellows sleeve resilient mandrel, etc.
Therefore, the traditional pin shaft core expansion mechanism is complex in structure, overlarge in size, unstable in precision, high in cost, and the like, and some pin shaft core expansion mechanisms need to be supported by peripheral equipment.
Modern production pursues high efficiency, high accuracy, and with the wide application of numerical control technology, high-speed turning and high-speed grinding in the machine-building industry, these traditional car, mill anchor clamps have been unable to satisfy the demand of development. The market calls for faster and more precise process equipment. Similar process equipment is in great demand, and engineering technicians are always striving to develop equipment with small and exquisite structure, stable precision, high speed, high efficiency and low cost to replace the conventional product.
Disclosure of Invention
An object of the utility model is to provide an accurate core anchor clamps that expand based on zero clearance fit, its simple structure is compact, the location is accurate, and is convenient fast, and low cost has the commonality in the machine-building field, all can conveniently use in the removable location structure between various lathe, grinding machine or work piece inspection and various mechanical product spare parts.
The technical scheme of the utility model is realized like this: the utility model provides a core anchor clamps expand to precision based on zero clearance fit comprises dabber body, navigation key, coil spring and spacing ring, its characterized in that: 3 guide grooves with the width equal to that of the positioning key and required by clearance fit with the positioning key are uniformly distributed on the mandrel body, the bottom surface of each guide groove is provided with a 3-6-degree oblique angle with self-locking property, the positioning key is provided with a counter bore, a spiral spring is arranged in the counter bore of the positioning key and is also arranged in the key groove of the limiting ring, the height direction of the spiral spring props against the bottom of the key groove of the limiting ring, the width direction of the positioning key is in clearance fit with the key groove of the limiting ring, and the spiral spring tightly presses the positioning key at the bottom of the guide groove of the mandrel body.
The spacing ring on 3 keyway and the cooperation of locating key of equipartition.
The utility model has the advantages of simple and compact structure, accurate positioning, rapidness and convenience, low cost, universality in the field of mechanical manufacturing, and convenient use in various lathe, grinding machine or workpiece inspection and detachable positioning structures among various mechanical product parts; the production efficiency can be improved, the product precision can be better guaranteed, the field use effect is very good, and the device is worthy of popularization.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a schematic view of the mandrel body of the present invention.
Fig. 4 is a top view of the mandrel body of the present invention.
Fig. 5 is a schematic view of the positioning key of the present invention.
Fig. 6 is a schematic view of the stop collar of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings: as shown in fig. 1-6, a precision core expanding clamp based on zero clearance fit comprises a core shaft body 1, a positioning key 2, a spiral spring 3 and a limit ring 4, and is characterized in that: 3 guide grooves with the width equal to that of the positioning key 2 and with clearance fit requirements are uniformly distributed on the mandrel body 1, the bottom surface of each guide groove is provided with a 3-6 oblique angle with self-locking performance, the positioning key 2 is provided with a counter bore, the spiral spring 3 is arranged in the counter bore of the positioning key 2, the spiral spring 3 is also arranged in the key groove of the limiting ring 4, the height direction of the spiral spring is propped against the bottom of the key groove of the limiting ring 4, the width direction of the positioning key 2 is in clearance fit with the key groove of the limiting ring 4, and the spiral spring 3 tightly presses the positioning key 2 at the bottom of the guide groove of the mandrel body 1. The friction force between the positioning key 2 and the bottom of the guide groove is increased, so that the positioning key 2 can stay at any position in an inoperative state.
3 key grooves are uniformly distributed on the limiting ring 4 and matched with positioning keys.
During the use with the work piece hole cover enter by 3 equipartitions on the outer circumference that the navigation key 2 on dabber body 1 confirmed, then promote spacing ring 4 and slide from left to right, drive 3 navigation keys 2 simultaneously and upwards move along the inclined plane of direction tank bottom, navigation key 2 is bloated tightly the completion location with the work piece gradually and is pressed from both sides tightly. Increasing or decreasing the height dimension of the orientation key 2 accommodates a different range of workpiece bore size variations. After the processing is finished, the limiting ring 4 is pushed leftwards, the 3 positioning keys 2 slide leftwards along the inclined plane of the bottom of the guide groove, the height of the positioning keys is gradually reduced, the workpiece can be loosened, and the workpiece is dismounted. Thereby completing a loading and unloading process.
Claims (2)
1. The utility model provides a core anchor clamps expand to precision based on zero clearance fit comprises dabber body, navigation key, coil spring and spacing ring, its characterized in that: 3 guide grooves with the width equal to that of the positioning key and required by clearance fit with the positioning key are uniformly distributed on the mandrel body, the bottom surface of each guide groove is provided with a 3-6-degree oblique angle with self-locking property, the positioning key is provided with a counter bore, a spiral spring is arranged in the counter bore of the positioning key and is also arranged in the key groove of the limiting ring, the height direction of the spiral spring props against the bottom of the key groove of the limiting ring, the width direction of the positioning key is in clearance fit with the key groove of the limiting ring, and the spiral spring tightly presses the positioning key at the bottom of the guide groove of the mandrel body.
2. The precision core expanding clamp based on zero clearance fit of claim 1, wherein 3 key slots are uniformly distributed on the limiting ring to be matched with the positioning key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920636342.0U CN209831431U (en) | 2019-05-06 | 2019-05-06 | Precision core expansion clamp based on zero clearance fit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920636342.0U CN209831431U (en) | 2019-05-06 | 2019-05-06 | Precision core expansion clamp based on zero clearance fit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209831431U true CN209831431U (en) | 2019-12-24 |
Family
ID=68915454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920636342.0U Expired - Fee Related CN209831431U (en) | 2019-05-06 | 2019-05-06 | Precision core expansion clamp based on zero clearance fit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209831431U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211275A (en) * | 2021-12-27 | 2022-03-22 | 陈道斌 | Machining tool with adjustable freedom degree of double-side clamping assembly |
-
2019
- 2019-05-06 CN CN201920636342.0U patent/CN209831431U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211275A (en) * | 2021-12-27 | 2022-03-22 | 陈道斌 | Machining tool with adjustable freedom degree of double-side clamping assembly |
| CN114211275B (en) * | 2021-12-27 | 2023-01-03 | 陈道斌 | Machining tool with adjustable freedom degree of double-side clamping assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 Termination date: 20200506 |