CN112264945A - Oil pressure type floating expanding positioning pin - Google Patents
Oil pressure type floating expanding positioning pin Download PDFInfo
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- CN112264945A CN112264945A CN202011101810.8A CN202011101810A CN112264945A CN 112264945 A CN112264945 A CN 112264945A CN 202011101810 A CN202011101810 A CN 202011101810A CN 112264945 A CN112264945 A CN 112264945A
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- pin
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- expanding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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- Mechanical Engineering (AREA)
- Insertion Pins And Rivets (AREA)
Abstract
The invention discloses an oil pressure type floating expanding positioning pin which comprises a cylinder body, wherein a first mounting hole is formed in the cylinder body; a floating pin, a screw plug, a floating spring and an end cover are arranged in the first mounting hole from top to bottom; a second mounting blind hole is formed in the floating pin, a guide hole is formed in the pin head of the floating pin along the radial direction of the first mounting hole, and a steel ball is matched in the guide hole in a rolling manner; an expanding pin and a return spring are further arranged in the second mounting blind hole, a variable-diameter part is formed at the upper part of the expanding pin, a first sealing ring is sleeved on the expanding pin, a second sealing ring is sleeved on the plug screw, and a closed oil pressure cavity is formed by the combination of the first sealing ring, the expanding pin, the plug screw, the second sealing ring and the second mounting blind hole. The floating expanding positioning pin realizes the positioning of small-aperture products, effectively avoids the problem of product deformation when the products are clamped, and can be applied to the processing of thin-wall products with higher requirements.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to an oil pressure type floating expanding positioning pin.
Background
The currently used positioning pin, such as an oil pressure expanding positioning pin produced by japan corporation, can only be applied to a range of phi 7.6 to 10.8mm, depending on the structure and material. Especially if applied to apertures smaller than 7.0mm, the strength is not sufficient, which leads to frequent damage and even to production failure. With continuous innovation and upgrade of automobile products, for example, the process holes of the automobile products for positioning blanks are designed to be smaller and smaller gradually, and part of the process holes are between phi 5.5 and 7.0mm, so that the current positioning pin cannot adapt to the positioning requirements of the products and cannot meet the production requirements.
Moreover, the existing locating pins have a drawback: the locating pin is generally of a one-piece non-adjustable construction and when producing thin-walled products, the thin-walled products are deformed when clamped. Because the locating pin does not have the buffering clearance in the in-process with thin wall product contact, therefore the locating pin can lead to thin wall product to take place the deformation. Such deformation values, although very small, are sufficient to cause rejects for some products with high flatness requirements, which is very disadvantageous for production.
Disclosure of Invention
The invention provides an oil pressure type floating expanding positioning pin which not only realizes the positioning of small-aperture products, but also can be applied to the processing of thin-wall products with higher requirements so as to solve the problems in the background technology.
The technical scheme of the invention is as follows: the oil pressure type floating expanding positioning pin comprises a cylinder body, wherein a threaded mounting hole is formed in the cylinder body, and a first mounting hole is formed in the cylinder body; the upper part of the first mounting hole is a small-aperture section, the lower part of the first mounting hole is a large-aperture section, and a floating pin, a plug screw, a floating spring and an end cover are arranged in the first mounting hole from top to bottom; the floating pin is in up-and-down sliding fit with the side wall of the first mounting hole, and the pin head of the floating pin protrudes upwards to the outside of the cylinder body; the plug screw can be freely and vertically installed in the first installation hole in a sliding mode, and the pin tail of the floating pin is abutted to the plug screw; one end of the floating spring is abutted against the screw plug, the other end of the floating spring is abutted against the end cover, and the end cover is fixedly arranged in the first mounting hole;
a second mounting blind hole which is coaxial with the first mounting hole and has an upward hole bottom is formed in the floating pin, a guide hole is formed in the pin head of the floating pin along the radial direction of the first mounting hole, a steel ball is matched in the guide hole in a rolling manner, and the diameter of the steel ball is larger than the total axial length of the guide hole; the bottom of the second mounting blind hole extends upwards and exceeds the guide hole, the orifice of the guide hole communicated with the second mounting blind hole is an inner orifice, and the other orifice of the guide hole is an outer orifice; an expanding pin and a return spring are further arranged in the second mounting blind hole, and the expanding pin is in up-and-down sliding fit in the second mounting blind hole; the upper part of the expanding pin is provided with a reducing part, and when the expanding pin slides up and down, the reducing part contacts and pushes the steel ball outwards or separates from the steel ball; the diameter-expanding pin is sleeved with a first sealing ring, the screw plug is sleeved with a second sealing ring, and a closed oil pressure cavity is formed by combining the first sealing ring, the diameter-expanding pin, the screw plug, the second sealing ring and a second mounting blind hole; an oil filling hole is formed in the cylinder body and communicated with the oil pressure cavity; the reset spring is sleeved on the expanding pin, one end of the reset spring is abutted to the floating pin, and the other end of the reset spring is abutted to the expanding pin.
The outer side hole opening of the guide hole is outwards gradually reduced to be hemispherical, the diameter-variable part is an annular groove formed in the outer side wall of the expanding head along the circumferential direction, the width of the annular groove is larger than the diameter of the guide hole, the diameter from the groove bottom to the groove wall of the annular groove is gradually increased, and the annular groove and the outer side hole opening of the guide hole limit the steel ball in the guide hole to prevent the steel ball from falling out of the guide hole.
Further: three guide holes are uniformly distributed on the pin head of the floating pin along the circumferential direction, and a steel ball is arranged in each guide hole.
Has the advantages that: this scheme provides a floating hole enlargement locating pin of oil pressure formula, has following advantage:
1. after the cylinder body, the floating pin, the reset spring, the screw plug and the steel ball are combined, the positioning pin with the diameter expanding function is formed. The floating pin is used as a carrier, and the diameter expansion is realized by adopting the steel ball, so that the structural size can be smaller under the condition of meeting the structural strength in the actual production, the application range can reach phi 5.2-11 mm, the positioning precision of the product is measured within 20um, the positioning requirement of the small-hole product is met, and the production process requirement is met;
meanwhile, on the basis that the positioning pin meets the requirement of pin hole product positioning, the positioning pin has the function of up-down floating through the combination of the screw plug, the floating spring and the end cover and the floating pin, and if the product slightly moves downwards in the product pressing process, compensation is performed through the floating function, so that product deformation can be avoided, the processing precision of the product is improved, and the positioning pin is particularly suitable for thin-wall products.
2. Through optimization of the steel ball and the guide hole, the steel ball is accurately expanded, and meanwhile, the work conveying track of the steel ball is limited, if the hole opening at the outer side of the guide hole is gradually reduced, the steel ball is prevented from falling out of the guide hole; under the matching of the guide hole and the annular groove, the steel ball is limited in the guide hole together, so that the steel ball is accurately expanded, the diameter of the positioning pin in the scheme is expanded sensitively, the positioning precision is higher and more accurate, and the processing precision is improved.
3. Optimized selection, the conical surface of the annular groove pushes the three steel balls to realize gapless positioning of products, product deformation is eliminated, and production requirements under many conditions can be met.
Drawings
FIG. 1 is a schematic view of an installation structure of a floating expanding positioning pin according to the present invention;
FIG. 2 is a schematic structural view of the cylinder body in FIG. 1;
FIG. 3 is a schematic view of the installation structure of the steel ball of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1, 2 and 3, the invention discloses an oil pressure type floating expanding positioning pin, which comprises a cylinder body 1, wherein a threaded mounting hole 13 is formed in the edge of the cylinder body 1. The cylinder block 1 can be detachably fixed to a jig by screws, bolts, or the like using the screw mounting holes 13.
A first mounting hole 11 is formed in the cylinder body 1, the upper portion of the first mounting hole 11 is a small-aperture section 1a, and the lower portion of the first mounting hole 11 is a large-aperture section 1 b. The floating pin 2, the plug screw 6, the floating spring 7 and the end cover 8 are arranged in the first mounting hole 11 from top to bottom. The lateral wall of floating pin 2 and the pore wall clearance fit of first mounting hole 11, floating pin 2 can slide from top to bottom along the axis of first mounting hole 11. The pin head 21 of the floating pin 2 projects upward to the outside of the cylinder 1, and the pin tail 22 of the floating pin 2 abuts against the plug screw 6. The screw plug 6 is in up-and-down sliding fit with the first mounting hole 11, and the screw plug 6 can also slide up and down along the axial direction of the first mounting hole 11.
It should be noted that: the tail part of the screw plug 6 close to the floating spring is also abutted against the pin tail 22 of the floating pin 2, and the screw plug 6 needs to be limited by the floating pin 2, namely the stroke of the screw plug 6 sliding up and down is limited. The end cover 8 is in threaded connection with the cylinder body 1. One end of the floating spring 7 is abutted against the screw plug 6, and the other end is abutted against the end cover 8.
A second mounting blind hole is formed in the floating pin 2, and an expanding pin 4 is arranged in the second mounting blind hole. The diameter-expanding pin 4 is in sliding fit with the second mounting blind hole, and the diameter-expanding pin 4 can slide up and down in the second mounting blind hole under the action of external force. The expanding pin 4 is sleeved with a first sealing ring 31, and the first sealing ring 31 is used for sealing a gap between the expanding pin 4 and the hole wall of the second mounting blind hole. The upper portion of the plug screw 6 extends into the second mounting blind hole, a second sealing ring 32 is sleeved on the plug screw 6, and the second sealing ring 32 is used for sealing a gap between the plug screw 6 and the hole wall of the second mounting blind hole.
A first sealing ring 31, an expanding pin 4, a screw plug 6, a second sealing ring 32 and a second mounting blind hole of the floating pin 2 are combined to form a closed oil pressure cavity 4 a. An oil filling hole 12 is formed in the cylinder block 1, and the oil filling hole 12 communicates with the oil pressure chamber 4 a. The reset spring 5 is sleeved on the expanding pin 4, one end of the reset spring 5 is abutted with the floating pin 2, and the other end of the reset spring 5 is abutted with the expanding pin 4.
As shown in fig. 1 and 3, a guide hole 23 is opened on the side wall of the pin head 21 of the floating pin 2, an outer aperture 23a of the guide hole 23 is outwardly tapered in a hemispherical shape, and the guide hole 23 is smaller than the diameter of the steel ball 9. The steel ball 9 is placed in the guide hole 23, the steel ball 9 can be in rolling fit or sliding fit with the guide hole 23, and the diameter of the steel ball 9 is larger than the axial total length of the guide hole 23. The steel ball 9 can only be put in through the inner opening of the guide hole 23 and can not be completely removed through the outer opening 23a of the guide hole 23. The partial sphere of the steel ball 9 can protrude out of the outer side wall of the pin head 21 along the axial direction of the guide hole 23 so as to abut against the product 10 to be processed.
The guide hole 23 communicates with the second blind mounting hole. The expanding pin 4 is provided with an expanding head 41, and the expanding head 41 is coaxially matched with the second mounting blind hole in a sliding manner. The outer side wall of the expanding head 41 is provided with an annular groove along the circumferential direction, the width of the annular groove is larger than the diameter of the guide hole 23, and the diameters of two groove walls 4a of the annular groove are linearly changed. As shown in fig. 3, the diameter of the groove bottom 4b to the groove wall 4a of the annular groove gradually increases. When the expanding pin 4 slides up and down along the axial direction of the second mounting blind hole, the two groove walls 4a of the annular groove can push the steel ball 9 outwards along the axial direction of the guide hole 23, and part of the ball body of the steel ball 9 is enabled to protrude out of the pin head 21. Meanwhile, the steel ball 9 is limited in the guide hole 23 by the annular groove and the outer side hole opening 23a of the guide hole 23, and the steel ball 9 is prevented from being pulled out of the guide hole 23.
The specific implementation mode of the floating expanding positioning pin in the scheme is as follows: high-pressure oil is injected into the oil pressure cavity 4a through the oil injection hole 12. The elastic force of the floating spring 7 is greater than that of the return spring 5. Therefore, when high-pressure oil is injected into the hydraulic chamber 4a, the diameter-expanding pin 4 rises. The annular groove in the expanding head 41 pushes the steel ball 9 horizontally outward as shown in fig. 3 during the ascent process, causing the steel ball 9 to protrude outward along the guide hole 23 beyond the pin head 21 of the floating pin 2.
In the optimized scheme, three guide holes 23 and three steel balls 9 are uniformly distributed on a pin head 21 of the floating pin 2 along the circumferential direction, and the guide holes 23 correspond to the steel balls 9 one by one. The expanding direction simultaneously pushes the three steel balls 9 to respectively move along the radial direction of the pin head 21 of the floating pin 2 in the ascending process, and then the three steel balls 9 are used for tightly propping against the product 10. However, if the product 10 is moving downward in the process, or if the product 10 undergoes a slight change in dimension during the process: the floating spring 7 is deformed, and the gap between the product 10 and the floating pin 2 is compensated or avoided by the deformation of the floating spring 7, so that the product 10 is prevented from being deformed due to hard touch. Particularly for pilot hole tapered products 10.
It should be noted that: the sliding fit and the clearance fit in the present description are the same structure, and the terms are different for convenience of description. When the high-pressure oil in the oil pressure chamber 4a is drained, the diameter-expanding pin 4 returns to the initial position by the return spring 5.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. Oil pressure formula is floated and is expanded diameter locating pin, its characterized in that: the cylinder comprises a cylinder body (1), wherein a threaded mounting hole (13) is formed in the cylinder body (1), and a first mounting hole (11) is formed in the cylinder body (1); the upper part of the first mounting hole (11) is a small-aperture section (1a), the lower part of the first mounting hole is a large-aperture section (1b), and a floating pin (2), a screw plug (6), a floating spring (7) and an end cover (8) are arranged in the first mounting hole (11) from top to bottom; the floating pin (2) is in up-and-down sliding fit with the side wall of the first mounting hole (11), and a pin head (21) of the floating pin (2) protrudes upwards to the outside of the cylinder body (1); the screw plug (6) can be freely and vertically installed in the first installation hole (11) in a sliding mode, and a pin tail (22) of the floating pin (2) is abutted to the screw plug (6); one end of the floating spring (7) is abutted with the screw plug (6), the other end of the floating spring (7) is abutted on the end cover (8), and the end cover (8) is fixedly installed in the first installation hole (11);
a second mounting blind hole which is coaxial with the first mounting hole (11) and has an upward hole bottom is formed in the floating pin (2), a guide hole (23) is formed in the pin head (21) of the floating pin (2) along the radial direction of the first mounting hole (11), a steel ball (9) is matched in the guide hole (23) in a rolling manner, and the diameter of the steel ball (9) is larger than the total axial length of the guide hole (23); the bottom of the second mounting blind hole extends upwards and exceeds the guide hole (23), the hole opening of the guide hole (23) communicated with the second mounting blind hole is an inner side hole opening, and the other hole opening of the guide hole (23) is an outer side hole opening (23 a); an expanding pin (4) and a return spring (5) are further arranged in the second mounting blind hole, and the expanding pin (4) is in up-and-down sliding fit in the second mounting blind hole; a reducing part is formed at the upper part of the expanding pin (4), and when the expanding pin (4) slides up and down, the reducing part contacts and pushes the steel ball (9) outwards or separates from the steel ball (9); a first sealing ring (31) is sleeved on the diameter expanding pin (4), a second sealing ring (32) is sleeved on the plug screw (6), and a closed oil pressure cavity (4a) is formed by combining the first sealing ring (31), the diameter expanding pin (4), the plug screw (6), the second sealing ring (32) and the second mounting blind hole; an oil filling hole (12) is formed in the cylinder body (1), and the oil filling hole (12) is communicated with the oil pressure cavity (4 a); the reset spring (5) is sleeved on the floating pin (4), one end of the reset spring (5) is abutted against the floating pin (2), and the other end of the reset spring (5) is abutted against the expanding pin (4).
2. The oil pressure type floating expanding positioning pin according to claim 1, characterized in that: the outer side hole opening (23a) of the guide hole (23) is outwards gradually reduced to be hemispherical, the diameter reducing portion is an annular groove formed in the outer side wall of the expanding head (41) along the circumferential direction, the width of the annular groove is larger than the diameter of the guide hole (23), the diameter from the groove bottom (4b) to the groove wall (4a) of the annular groove is gradually increased, the annular groove and the outer side hole opening (23a) of the guide hole (23) limit the steel ball (9) in the guide hole (23), and the steel ball (9) is prevented from being separated from the guide hole (23).
3. The oil pressure type floating expanding locating pin according to any one of claims 1 or 2, characterized in that: three guide holes (23) are uniformly distributed on a pin head (21) of the floating pin (2) along the circumferential direction, and a steel ball (9) is arranged in each guide hole (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011101810.8A CN112264945A (en) | 2020-10-15 | 2020-10-15 | Oil pressure type floating expanding positioning pin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011101810.8A CN112264945A (en) | 2020-10-15 | 2020-10-15 | Oil pressure type floating expanding positioning pin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112264945A true CN112264945A (en) | 2021-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011101810.8A Pending CN112264945A (en) | 2020-10-15 | 2020-10-15 | Oil pressure type floating expanding positioning pin |
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| CN (1) | CN112264945A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6527266B1 (en) * | 1999-08-03 | 2003-03-04 | Kabushiki Kaisha Kosmek | Clamping apparatus with datum function |
| JP2003300124A (en) * | 2002-04-09 | 2003-10-21 | Kosmek Ltd | Clamp device |
| CN103170853A (en) * | 2013-03-25 | 2013-06-26 | 中国重汽集团大同齿轮有限公司 | Fixture for box body with cylinder type structure |
| CN104440197A (en) * | 2014-12-05 | 2015-03-25 | 重庆耀勇减震器有限公司 | Tail positioning tool for dual-head bore |
| CN107052861A (en) * | 2017-04-14 | 2017-08-18 | 昆山冠品优精密机械有限公司 | Quick-clamping detent mechanism |
| CN207953265U (en) * | 2017-12-28 | 2018-10-12 | 沈阳邦嘉科技有限公司 | A kind of pallet being suitable for high finishing |
| CN110206803A (en) * | 2019-05-30 | 2019-09-06 | 西安法士特汽车传动有限公司 | A kind of floating positioning pin and localization method |
-
2020
- 2020-10-15 CN CN202011101810.8A patent/CN112264945A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6527266B1 (en) * | 1999-08-03 | 2003-03-04 | Kabushiki Kaisha Kosmek | Clamping apparatus with datum function |
| JP2003300124A (en) * | 2002-04-09 | 2003-10-21 | Kosmek Ltd | Clamp device |
| CN103170853A (en) * | 2013-03-25 | 2013-06-26 | 中国重汽集团大同齿轮有限公司 | Fixture for box body with cylinder type structure |
| CN104440197A (en) * | 2014-12-05 | 2015-03-25 | 重庆耀勇减震器有限公司 | Tail positioning tool for dual-head bore |
| CN107052861A (en) * | 2017-04-14 | 2017-08-18 | 昆山冠品优精密机械有限公司 | Quick-clamping detent mechanism |
| CN207953265U (en) * | 2017-12-28 | 2018-10-12 | 沈阳邦嘉科技有限公司 | A kind of pallet being suitable for high finishing |
| CN110206803A (en) * | 2019-05-30 | 2019-09-06 | 西安法士特汽车传动有限公司 | A kind of floating positioning pin and localization method |
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Application publication date: 20210126 |