CN217819145U - Connecting rod bush pulling-out force detection device - Google Patents

Abstract

The utility model discloses a connecting rod bush pulling-out force detection device, which comprises a bottom plate, wherein the top surface of the bottom plate is provided with a small end positioning device and a big end positioning mandrel, the small end of a connecting rod assembly is positioned and connected on the small end positioning device, the big end of the connecting rod assembly is positioned and connected on the big end positioning mandrel, and the big end positioning mandrel is connected on the bottom plate in a sliding way through a connecting component; the small end positioning device is provided with an adjusting mandrel for first installation, and an upper pressure head for detection is arranged above the small end of the connecting rod assembly. The utility model adopts a profiling structure, the measuring supporting block is matched with the small end face of the connecting rod assembly, and the measuring supporting block is suitable for detecting the pull-out force of the bushing at the small end of the connecting rod with different types; the large-head positioning core shaft can move, so that the pull-out force detection of the connecting rod bushing with different center distances is met; the upper pressure head adopts a profiling structure, so that the pull-out force detection of the bushings with different shapes is met; the maximum force in the stroke pressure curve displayed by the servo press is determined as the pulling-out force, the operation is simple, and the accuracy is high.

Description

Connecting rod bush pulling-out force detection device

Technical Field

The utility model relates to a car connecting rod processing technology field especially relates to a connecting rod bush pulls out power detection device that takes off.

Background

In the production process of the automobile connecting rod, when the bushing is pressed into the small-end bottom hole of the connecting rod, enough fitting degree of the bushing and the small-end bottom hole needs to be ensured so as to avoid the risk of bushing rotation during the operation of an engine. The commonly used method for detecting the fitting degree of the bushing is a grid method, the grid method is to paint color on the outer diameter cylindrical surface of the bushing, press the bushing into a small-end bottom hole by a press, press the bushing by the press, roll the extruded bushing for a whole circle on grid paper, and calculate the fitting degree of the bushing by calculating the proportion of colored grids and the grid rolled-over grids. In order to solve the problems, the mode of detecting the pulling-out force is suggested to indirectly reflect the fitting condition of the bushing and the small-head bottom hole.

The Chinese patent with the application number of CN201910517852.0 discloses a connecting rod bushing fitting degree detection tool and a detection method, wherein the detection tool comprises a cylindrical tool body, and a plurality of arc-shaped detection windows are arranged along the circumferential direction of the tool body; the high matching precision of the connecting rod bushing and the tool body can be guaranteed, and the real form of the connecting rod bushing in the small end of the connecting rod can be accurately reflected. The method for detecting the attaching degree of the connecting rod bushing comprises the steps of firstly pressing the connecting rod bushing into a tool body, placing the tool body pressed into the connecting rod bushing into a detection table, and calibrating a three-coordinate or cylindricity instrument; then, carrying out roundness measurement on the outer surfaces of the connecting rod bushings at different heights in the detection window by using the detection probe, and fitting the measurement data to obtain the cylindricity of the outer surfaces of the connecting rod bushings; finally, determining the fitting degree according to the cylindricity, wherein if the cylindricity is in a specified range, the product is qualified; the joint rate of the connecting rod bushing and the small end of the connecting rod can be rapidly and accurately evaluated, and the situation of large data fluctuation caused by manual operation can be avoided; however, the method only detects the attaching degree of the excircle of the single small-head bushing, and cannot detect the attaching degree of the bottom hole of the small head of the connecting rod and the bushing after the two bushings are matched.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a connecting rod bush pulls out power detection device that takes off solves among the prior art connecting rod bush and pulls out power detection operation complicacy, detects the poor problem of frock commonality.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model relates to a connecting rod bush pulling-out force detection device, which comprises a bottom plate, wherein the top surface of the bottom plate is provided with a small end positioning device and a large end positioning mandrel, the small end of a connecting rod assembly is positioned and connected on the small end positioning device, the large end of the connecting rod assembly is positioned and connected on the large end positioning mandrel, and the large end positioning mandrel is connected on the bottom plate in a sliding way through a connecting component; the small end positioning device is provided with an adjusting mandrel for first installation, and an upper pressure head for detection is arranged above the small end of the connecting rod assembly.

Furthermore, one side of the top surface of the bottom plate is provided with a limiting hole, the small-head positioning device is fixedly connected in the limiting hole, the other side of the top surface of the bottom plate is provided with a positioning groove, and the large-head positioning mandrel is connected to the positioning groove in a sliding mode through a connecting assembly.

Still further, the small head positioning device comprises a small head positioning base and a measuring supporting block, the bottom surface of the measuring supporting block is welded with the top surface of the small head positioning base, and the measuring supporting block is matched with the small head end surface of the connecting rod assembly; the bottom surface of the small head positioning base is provided with a limiting boss matched with the limiting hole, the center of the small head positioning base is provided with a lining blanking hole, and the top surface of the small head positioning base is provided with a small head forging excircle limiting groove matched with the outline of the small head end of the connecting rod assembly.

Still further, big head positioning core axle includes big head positioning base, big head positioning base's top surface be connected with the through-hole assorted location boss of connecting rod assembly big head end, big head positioning base's bottom surface be connected with constant head tank assorted locating piece, big head positioning base big head positioning boss with the locating piece center is provided with the bolt hole that runs through.

Still further, coupling assembling includes bolt and latch segment, the latch segment sets up in the constant head tank, the bolt runs through behind the bolt hole through the latch segment locking location.

Still further, it includes kicking block, central dabber and axle sleeve to go up the pressure head, the kicking block welding is in the top surface of central dabber, the axle sleeve cover is established on the outer peripheral face of central dabber, the top surface of axle sleeve with the bottom surface welding of kicking block is in the same place, the axle sleeve with the microcephaly terminal surface phase-match of connecting rod assembly.

Still further, the shaft sleeve and the central core shaft are in transition fit.

Still further, the adjusting mandrel comprises a large-diameter end and a small-diameter end, the large-diameter end is matched with the bushing blanking hole, and the small-diameter end is matched with an inner hole of a small-head bushing of the connecting rod assembly.

Compared with the prior art, the utility model discloses a beneficial technological effect:

the utility model relates to a connecting rod bush pull-out force detection device and detection method, little head positioner welds and assembles with little head positioning base and two parts of measurement supporting shoe, can support little head end face in the testing process immediately, the measurement supporting shoe adopts the profile modeling structure, it carries out the customization design and makes according to the appearance of the little head end of the connecting rod of awaiting measuring, the measurement supporting shoe matches with little head end face of connecting rod assembly, when using, the little head end face of connecting rod assembly and the top surface of measurement supporting shoe laminate, guarantee that the atress is even, can satisfy the detection of little head end face bush pull-out force of different structures, can be suitable for the detection of the little head end bush pull-out force of different types connecting rod, it is convenient and reliable to detect simultaneously, low cost, high efficiency; the large-head positioning core shaft can move along the positioning groove, so that the detection of pulling-out forces of the connecting rod bushings with different center distances can be met, and the universality is high; the upper pressure head adopts a profiling structure and is customized and designed according to the shape of the connecting rod bushing to be measured, so that the stress on the cross section of the bushing is uniform when the pulling-out force is measured, and the detection of the pulling-out force of the bushing with different shapes can be met; during detection, a servo press capable of displaying a pressure stroke curve in real time is adopted to carry out a detection test, and the maximum force in the stroke pressure curve displayed by the servo press is determined as the pulling-out force, so that whether the pulling-out force is qualified or not is confirmed, the operation is simple, the accuracy is high, and the detection test of the pulling-out force of the connecting rod assembly bushing is well realized.

Drawings

The present invention will be further explained with reference to the following description of the drawings.

FIG. 1 is a sectional view of the connecting rod bushing pulling-out force detecting device of the present invention during detection;

fig. 2 is a sectional view of the connecting rod bushing pulling-out force detecting device of the present invention when first installed;

FIG. 3 is a top view of the connecting rod bushing pulling-out force detecting device of the present invention;

fig. 4 is a cross-sectional view of the upper ram of the present invention;

FIG. 5 is a schematic structural view of the small end positioning device of the present invention;

FIG. 6 is a schematic structural view of the big-end positioning mandrel of the present invention;

description of reference numerals: 1. an upper pressure head; 101. a top block; 102. a central mandrel; 103. a shaft sleeve; 2. a small-head positioning device; 201. a small-head positioning base; 202. measuring a supporting block; 201-1, a lining blanking hole; 201-2, forging an excircle limit groove by a small head; 3. a large-head positioning mandrel; 301. a large head positioning base; 302. positioning the boss; 303. positioning blocks; 304. bolt holes; 4. a base plate; 401. positioning a groove; 402. a limiting hole; 5. adjusting the mandrel; 501. a large diameter end; 502. a small diameter end; 6. a bolt; 7. a locking block; 8. a connecting rod assembly; 801. a small-end bushing;

Φ d, the diameter of the small-head hole; phi d1, the diameter of a bottom hole of a small end of the connecting rod; phi d2, the diameter of a bushing blanking hole; phi D, forging the diameter of the outer circle of the small head; d3, forging the small end to obtain an excircle limit groove width; phid 4, the diameter of the central mandrel; phi d5, the outer diameter of the lower part of the shaft sleeve.

Detailed Description

As shown in fig. 1 to 6, a connecting rod bushing pulling-out force detection device includes a base plate 4, a small end positioning device 2 and a large end positioning mandrel 3 are arranged on a top surface of the base plate 4, a small end of a connecting rod assembly 8 is positioned and connected to the small end positioning device 2, a large end of the connecting rod assembly 8 is positioned and connected to the large end positioning mandrel 3, and the large end positioning mandrel 3 is slidably connected to the base plate 4 through a connection assembly; an adjusting mandrel 5 for primary installation is arranged on the small head positioning device 2, and an upper pressure head 1 for detection is arranged above the small head end of the connecting rod assembly 8; the connecting rod assembly of the utility model is positioned by the positioning end surface formed by combining the big head positioning mandrel, the small head positioning device and the supporting surfaces of the big head positioning mandrel and the small head positioning device; when the device is installed for the first time, the adjusting mandrel 5 is placed on the small-head positioning device 2, and the position of the large-head positioning mandrel is adjusted and locked and fixed by placing the connecting rod assembly; the large-head positioning mandrel is a cylindrical pin, and the position of the small head of the connecting rod in the direction of the center distance can be indirectly positioned through the center distance of the large hole and the small hole of the connecting rod; the limit size of the small head positioning device 2 fully considers the forging tolerance, and continuous detection can be realized after the first adjustment is finished; the large-head positioning mandrel can move along the positioning groove, so that the adjustment is convenient; during detection, the servo press capable of displaying the pressure travel curve in real time is adopted to carry out detection test, and the maximum force in the travel pressure curve displayed by the servo press is determined as the pulling-out force, so that whether the pulling-out force is qualified or not is determined, the operation is simple, the accuracy is high, and the detection test of the pulling-out force of the connecting rod assembly bushing is well realized.

Specifically, one side of the top surface of the bottom plate 4 is provided with a limiting hole 402, the small-head positioning device 2 is fixedly connected in the limiting hole 402, the other side of the top surface of the bottom plate 4 is provided with a positioning groove 401, and the large-head positioning mandrel 3 is slidably connected to the positioning groove 401 through a connecting assembly; specifically, the lower part of the small head positioning base 2 is provided with a limiting block matched with the limiting hole 402, and the limiting block can be fixed by directly placing the limiting block in the limiting hole 402; the positioning groove 401 is arranged to be a T-shaped positioning groove, and the large-head positioning mandrel can move along the T-shaped positioning groove, so that the adjustment is convenient; the pull-out force detection of the connecting rod bushing with different center distances is met by adjusting the relative positions of the large-head positioning mandrel positioning block and the T-shaped positioning groove of the bottom plate.

As shown in fig. 1 and 5, the small head positioning device 2 includes a small head positioning base 201 and a measuring support block 202, a bottom surface of the measuring support block 202 is welded to a top surface of the small head positioning base 201, and the measuring support block 202 is matched with a small head end surface of the connecting rod assembly 8, and is used for supporting a small head inclined surface to prevent a detection failure caused by a connecting rod inclination during detection; the bottom surface of the small head positioning base 201 is provided with a limiting boss matched with the limiting hole 402, the center of the small head positioning base 201 is provided with a lining blanking hole 201-1 for installing a falling lining in the detection process, and the top surface of the small head positioning base 201 is provided with a small head forging excircle limiting groove 201-2 matched with the outer contour of the small head end of the connecting rod assembly 8; specifically, the diameter phi D2 of a bushing blanking hole is = phi D1+1mm, and the width D3 of a small-end forging excircle limit groove is = phi D +0.8mm; microcephaly location base forms with two part welding equipment, can support microcephaly terminal surface immediately in the testing process, avoids taking place the slope and leads to detecting the failure, and the connecting rod microcephaly terminal surface has several kinds of forms: the small end is machined with an inclined plane, the small end face is a forged special-shaped face, the measuring support block 202 adopts a profiling structure and is designed and manufactured in a customized manner according to the appearance of the small end of the connecting rod to be measured, the measuring support block 202 is matched with the small end face of the connecting rod assembly, and when the connecting rod assembly is used, the small end face of the connecting rod assembly is attached to the top surface of the measuring support block 202, so that the uniform stress is ensured, and the detection of the pull-out force of the small end face bushing with different structures can be met; when the small end face of the connecting rod assembly is an inclined plane, the inclination angle of the top surface of the supporting block is measured and determined according to the inclination angle of the small end face of the connecting rod assembly, so that the detection of the pull-out force of the small end face bushing with different inclination angles can be met; the skirt edge of the small-head positioning base is used for limiting the size of the forged excircle of the small-head end, so that the coaxiality of the bushing and the blanking hole is limited, and the bushing is guaranteed to smoothly fall into the bushing blanking hole of the small-head positioning base when the pulling-out force is detected.

As shown in fig. 6, the large-head positioning mandrel 3 includes a large-head positioning base 301, a positioning boss 302 matched with a through hole at a large head end of the connecting rod assembly 8 is connected to a top surface of the large-head positioning base 301, a positioning block 303 matched with the positioning groove 401 is connected to a bottom surface of the large-head positioning base 301, and a through bolt hole 304 is arranged at the center of the large-head positioning base 301, the positioning boss 302 and the positioning block 303; specifically, the large-head positioning mandrel is a cylindrical pin, the diameter of the cylindrical pin = the lower limit (-0.06, -0.04) mm of the diameter of the large hole of the connecting rod, the position of the small head of the connecting rod in the direction of the center distance is indirectly positioned through the center distance of the large hole and the small hole of the connecting rod, and the small head of the connecting rod can accurately fall into the blanking hole when the bushing is extruded.

As shown in fig. 1, the connecting assembly includes a bolt 6 and a locking block 7, the locking block 7 is disposed in the positioning groove 401, and the bolt 6 penetrates through the bolt hole 304 and is locked and positioned by the locking block 7.

As shown in fig. 4, the upper ram 1 includes a top block 101, a central core shaft 102 and a shaft sleeve 103, the top block 101 is welded on the top surface of the central core shaft 102, the shaft sleeve 103 is sleeved on the outer circumferential surface of the central core shaft 102, the top surface of the shaft sleeve 103 is welded with the bottom surface of the top block 101, and the shaft sleeve 103 is matched with the small end surface of the connecting rod assembly 8; the shaft sleeve 103 is in transition fit with the central mandrel 102; specifically, the diameter phi d4= phi d-0.05mm of the central mandrel, the outer diameter phi d5= phi d1 (-0.1, -0.05) mm of the lower part of the shaft sleeve, and the longitudinal section of the lower part of the shaft sleeve is the same as the end face of the small end of the connecting rod, so that the bushing is uniformly stressed when the upper pressure head presses downwards; the upper pressure head is of a profiling structure and is customized, designed and manufactured according to the appearance of the connecting rod bushing to be measured, so that the stress of the cross section of the bushing is uniform when the pulling-out force is measured, the error caused by the pulling-out force measurement due to the deflection is avoided, and the detection of the pulling-out force of the bushing with different appearances can be met.

As shown in fig. 2, the adjusting mandrel 5 includes a large diameter end 501 and a small diameter end 502, the large diameter end 501 matches with the bushing blanking hole 201-1, and the small diameter end 502 matches with the inner hole of the small-head bushing 801 of the connecting rod assembly 8; the positioning and adjusting mandrel is used for adjusting and fixing the position of the large-head hole positioning mandrel during first assembly.

A connecting rod bush pulling-out force detection method utilizes the connecting rod bush pulling-out force detection device to detect, and specifically comprises the following steps:

step one, alignment of the position of a large-head positioning mandrel: inserting a large-diameter end 501 of the adjusting mandrel 5 into a bush blanking hole 201-1 on the small-head positioning base 201, positioning and connecting a small-head end of the connecting rod assembly 8 to the small-diameter end 502, then adjusting the position of the large-head positioning mandrel 3 according to the center distance of through holes at two ends of the connecting rod assembly 8, positioning and connecting a large-head end of the connecting rod assembly 8 to the large-head positioning mandrel 3, then, after penetrating the bolt 6 through the bolt hole 304, locking and positioning through the locking block 7, fixing the position of the large-head positioning mandrel 3, and completing the alignment of the position of the large-head positioning mandrel;

step two, adjusting the disassembly of the mandrel: taking down the connecting rod assembly 8, and then taking down the adjusting mandrel 5;

step three, secondary installation of the connecting rod: positioning and connecting a large end of the connecting rod assembly 8 to the large end positioning mandrel 3, and positioning and connecting a small end of the connecting rod assembly 8 to the small end positioning device 2;

step four, detection operation of the connecting rod: flatly placing the upper pressure head 1 on the small-head end face of the connecting rod assembly 8, starting a servo press, pressing the upper pressure head 1 downwards by the servo press, pressing the small-head bushing 801 out by the upper pressure head 1, enabling the small-head bushing 801 to fall into the bushing blanking hole 201-1 on the small-head positioning base 201, determining the maximum force in a stroke pressure curve displayed by the servo press as a pulling-out force, and comparing the detected pulling-out force with the theoretically-designed pulling-out force to confirm whether the pulling-out force is qualified.

Specifically, in the first step, the adjusting mandrel 5 is used in the alignment process of the large-head positioning mandrel, when the position of the large-head positioning mandrel 3 is determined, the adjusting mandrel 5 is taken down, the adjustment is not required to be performed again after the first adjustment is completed, and then the continuous detection is performed; when the change of the center distance of the connecting rod assembly 8 needs to be detected, the position of the large-head positioning mandrel 3 needs to be determined again by using the adjusting mandrel 5.

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims (8)

1. The utility model provides a connecting rod bush pull-out force detection device which characterized in that: the connecting rod assembly comprises a bottom plate (4), wherein a small-head positioning device (2) and a large-head positioning mandrel (3) are arranged on the top surface of the bottom plate (4), the small-head end of a connecting rod assembly (8) is connected to the small-head positioning device (2) in a positioning mode, the large-head end of the connecting rod assembly (8) is connected to the large-head positioning mandrel (3) in a positioning mode, and the large-head positioning mandrel (3) is connected to the bottom plate (4) in a sliding mode through a connecting assembly; the small end positioning device (2) is provided with an adjusting mandrel (5) for first installation, and an upper pressure head (1) for detection is arranged above the small end of the connecting rod assembly (8).

2. The connecting rod bushing pulling-out force detecting device according to claim 1, characterized in that: one side of bottom plate (4) top surface is provided with spacing hole (402), microcephaly positioner (2) fixed connection be in spacing hole (402), the opposite side of bottom plate (4) top surface is provided with constant head tank (401), bull head positioning core axle (3) pass through coupling assembling slidable and connect in on constant head tank (401).

3. The connecting rod bushing pulling-out force detecting device according to claim 2, characterized in that: the small head positioning device (2) comprises a small head positioning base (201) and a measuring supporting block (202), the bottom surface of the measuring supporting block (202) is welded with the top surface of the small head positioning base (201), and the measuring supporting block (202) is matched with the small head end surface of the connecting rod assembly (8); the bottom surface of the small head positioning base (201) is provided with a limiting boss matched with the limiting hole (402), the center of the small head positioning base (201) is provided with a lining blanking hole (201-1), and the top surface of the small head positioning base (201) is provided with a small head forging excircle limiting groove (201-2) matched with the outer contour of the small head end of the connecting rod assembly (8).

4. The connecting rod bushing pulling-out force detecting device according to claim 2, characterized in that: big head positioning mandrel (3) are including big head positioning base (301), the top surface of big head positioning base (301) be connected with through-hole assorted location boss (302) of connecting rod assembly (8) big head end, the bottom surface of big head positioning base (301) be connected with constant head tank (401) assorted locating piece (303), big head positioning base (301) location boss (302) with locating piece (303) center is provided with bolt hole (304) that run through.

5. The connecting rod bushing pulling-out force detecting device according to claim 4, wherein: coupling assembling includes bolt (6) and latch segment (7), latch segment (7) set up in constant head tank (401), bolt (6) run through behind bolt hole (304) pass through latch segment (7) locking location.

6. The connecting rod bushing pulling-out force detecting device according to claim 1, characterized in that: go up pressure head (1) including kicking block (101), central dabber (102) and axle sleeve (103), kicking block (101) welding is in the top surface of central dabber (102), axle sleeve (103) cover is established on the outer peripheral face of central dabber (102), the top surface of axle sleeve (103) with the bottom surface welding of kicking block (101) is in the same place, axle sleeve (103) with the microcephaly terminal surface phase-match of connecting rod assembly (8).

7. The connecting rod bushing pulling-out force detecting device according to claim 6, wherein: the shaft sleeve (103) and the central mandrel (102) are in transition fit.

8. The connecting rod bushing pulling-out force detecting device according to claim 3, characterized in that: the adjusting mandrel (5) comprises a large-diameter end (501) and a small-diameter end (502), the large-diameter end (501) is matched with the bushing blanking hole (201-1), and the small-diameter end (502) is matched with an inner hole of a small-head bushing (801) of the connecting rod assembly (8).

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