Connecting rod machining tool and using method thereof

Abstract

The invention provides a connecting rod machining tool and a using method thereof.The connecting rod machining tool comprises a base, a first mounting groove, a second mounting groove and a sliding groove are formed in the base, and the center connecting line of the first mounting groove and the second mounting groove is collinear with the center line of the sliding groove; the limiting block is fixed to the upper end face of the base and located between the first mounting groove and the second mounting groove, a limiting groove is formed in the upper end face of the limiting block, and the center of the limiting groove is located on the center connecting line of the first mounting groove and the second mounting groove; the first positioning mandrel is movably mounted in the first mounting groove; the second positioning mandrel is movably mounted in the second mounting groove, and the upper section of the outer end face of the second positioning mandrel inclines towards the center of the second positioning mandrel; the process block is installed in the sliding groove in a sliding mode, and the end, facing the second positioning mandrel, of the process block is an arc face matched with the second positioning mandrel. The problems that in the prior art, connecting rod machining procedures are complex, efficiency is low, and machining precision is difficult to guarantee can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting rod processing, and in particular to a connecting rod processing tool and a use method thereof. Background Art

[0002] The connecting rod is the main force transmission component of the diesel engine of the internal combustion engine. The main and auxiliary connecting rod mechanism is one of the basic types commonly used in V-type diesel engines. Its structure is relatively special. The small ends of the main and auxiliary connecting rods are connected to the piston pin, the large end of the main connecting rod is installed on the crankshaft, and the large end of the auxiliary connecting rod is hinged to the joint pin of the lug at the large end of the main connecting rod. One type of this hinged structure is the saddle structure, which is fixedly connected to the joint pin by two fastening bolts on both sides of the connecting rod body plate.

[0003] In traditional processes, in order to manufacture saddle-shaped connecting rods that meet the requirements, it is usually necessary to reserve multiple reference surfaces for positioning at the blank stage. First, these reference surfaces are processed based on the rough boring, and then these reference surfaces are used as the positioning reference for the fine boring for further precision processing. Although this method can achieve a certain degree of accuracy, it also has obvious disadvantages: the process is complicated and time-consuming, which reduces production efficiency; at the same time, it puts forward additional requirements for the design of the connecting rod, limiting its flexibility. In addition, the need for multiple clamping and adjustment increases the risk of cumulative errors, which poses a potential threat to product quality.

[0004] For saddle holes, the dimensional accuracy requirements are extremely stringent, with a diameter tolerance of only 0.01mm. Moreover, the hole is not a complete circle, but is specially designed according to actual needs. Traditional detection methods mainly include the use of three-coordinate fitting or standard gauge blocks for detection, and then adjusting the boring tool size according to the detection results to ensure the accuracy of the saddle hole. However, the measurement results of this method may have a slight deviation from the actual value, especially in the case of an incomplete circle; in addition, the boring tool size cannot be adjusted in real time according to the real-time detection data results, which puts forward requirements for the boring tool's repeatability.

[0005] In summary, the prior art has the following problems when processing saddle-shaped connecting rods:

[0006] 1. It is necessary to set an additional positioning reference surface on the connecting rod blank surface to carry out precision boring positioning, which makes the process complicated and inefficient;

[0007] 2. The saddle hole size detection needs to be removed from the processing tooling for detection. It is impossible to detect and adjust in real time during processing, and the processing accuracy is difficult to guarantee. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects of the prior art and provide a connecting rod processing tool and its use method, which can solve the problems of complex processing procedures, low efficiency, and difficulty in ensuring processing accuracy of connecting rods (especially saddle-shaped structure connecting rods) in the prior art.

[0009] In order to achieve the above purpose and other purposes, the present invention is implemented by including the following technical solutions: as a first aspect, the present invention proposes a connecting rod processing tooling, including a base, on which a first mounting groove, a second mounting groove and a slide groove are provided, and the center line of the first mounting groove and the second mounting groove is collinear with the center line of the slide groove; a limit block is fixed on the upper end surface of the base, located between the first mounting groove and the second mounting groove, and a limit groove is provided on its upper end surface, and the center of the limit groove is located on the center line of the first mounting groove and the second mounting groove; a first positioning spindle is movably installed in the first mounting groove; a second positioning spindle is movably installed in the second mounting groove, and the upper section of the outer end surface of the second positioning spindle is inclined toward its center; a process block is slidably installed in the slide groove, and one end of which facing the second positioning spindle is an arc surface matching the second positioning spindle.

[0010] The first positioning mandrel and the second positioning mandrel of this scheme adopt a lifting design. The rising state is used for positioning, and the pin hole completed by rough boring in the previous process is used as the positioning reference to complete the reference transfer; and the upper end of the outer end face of the second positioning mandrel is inclined to compensate for the center distance size deviation and the small head hole diameter size deviation of different connecting rod head holes, thereby correcting the center connection line of the large and small head holes, and then realizing the complete positioning of the connecting rod; the descending state is used for processing to avoid interference between the boring tool and the positioning mandrel. Compared with the existing technology, there is no need to set an additional common reference positioning surface on the connecting rod blank surface, and the process reference is unified. The process block can adjust its position according to the size of the rough boring hole, and the process block and the saddle hole are processed together to solve the accuracy problem caused by uneven force during saddle hole processing.

[0011] In one embodiment, the inclination angle of the upper segment of the outer end surface is less than 0.5°.

[0012] This design solution can meet the saddle hole positioning requirements of all saddle-shaped connecting rods on the market.

[0013] In one embodiment, the center holes of the first positioning mandrel and the second positioning mandrel are respectively provided with internal threads and lifting screws connected to the internal threads, and the external threads of the lifting screws are clearance-matched with the internal threads.

[0014] This design can stably lift the first positioning mandrel and the second positioning mandrel by rotating the lifting screw clockwise; and after rotating the lifting screw counterclockwise, the first positioning mandrel and the second positioning mandrel can be restored to their original positions by their own weight, which is easy to operate and low in cost.

[0015] In one embodiment, a first guide column and a second guide column are respectively arranged in the first installation groove and the second installation groove, and guide holes are respectively arranged outside the center holes of the first positioning mandrel and the second positioning mandrel; the first positioning mandrel and the second positioning mandrel are respectively mounted on the first guide column and the second guide column.

[0016] The design of this solution can provide guidance for the lifting and lowering of the first positioning mandrel and the second positioning mandrel.

[0017] In one embodiment, at least two of the first guide posts and the second guide posts are provided respectively and are symmetrically arranged.

[0018] The design of this solution can ensure that the first positioning mandrel or the second positioning mandrel is subjected to uniform force during the rising process along the first guide column or the second guide column.

[0019] In one embodiment, a groove is respectively provided on the side walls of the first installation groove and the second installation groove, and a limiting assembly is respectively provided on the outer end faces of the first positioning spindle and the second positioning spindle; when the limiting assembly is inserted into the groove, the first positioning spindle and the second positioning spindle are lifted into place.

[0020] This design scheme can ensure that the first positioning mandrel and the second positioning mandrel can be accurately positioned after rising to a specific position.

[0021] In one embodiment, the limiting assembly includes a positioning ball that cooperates with the groove and a spring that tightens the positioning ball into the groove.

[0022] This design scheme can ensure that the first positioning core shaft and the second positioning core shaft can continue to rise or descend under their own weight after being subjected to force.

[0023] In one embodiment, the connecting rod processing tool further includes a dial indicator movably mounted on the base for checking whether the connecting rod is completely positioned after installation.

[0024] In one embodiment, a first iron chip baffle and a second iron chip baffle are respectively disposed on the first installation slot and the second installation slot.

[0025] This design scheme can prevent iron filings generated by machining from falling onto the first positioning mandrel and the second positioning mandrel, and avoid iron filings from blocking the gap between the first positioning mandrel and the first mounting groove and the gap between the second positioning mandrel and the second mounting groove, thereby affecting the lifting and lowering effects of the first positioning mandrel and the second positioning mandrel.

[0026] As a second aspect, the present invention further provides a method for using a connecting rod processing tool, using the connecting rod processing tool as described in the first aspect to position and clamp the connecting rod for processing, comprising the steps of:

[0027] In the initial state of the connecting rod processing tooling, the first positioning mandrel and the second positioning mandrel are respectively lifted to a specified height;

[0028] The big end hole of the big end of the connecting rod and the small end hole of the small end of the connecting rod are respectively sleeved on the first positioning mandrel and the second positioning mandrel, and the lower end surface of the rod body is against the limit block;

[0029] Move the dial indicator until the pointer contacts the end surface of the connecting rod;

[0030] Continue to lift the second positioning mandrel until the reading of the dial indicator starts to change and then stop lifting the second positioning mandrel;

[0031] The process block is moved along the slide groove until it is close to the second positioning core shaft, and the lower end surface of the process block is coplanar with the lower end surface of the small head hole;

[0032] After fixing the connecting rod and the process block, lowering the first positioning mandrel and the second positioning mandrel to below the upper end surface of the base;

[0033] The large head hole and the small head hole of the connecting rod are precision bored. After the precision boring is completed, the size of the process hole composed of the small head hole and the process block is directly checked and the boring tool size is adjusted to continue processing until the small head hole is processed to be qualified.

[0034] This design uses the rough boring hole as the positioning reference for the fine boring hole, and there is no need to set up additional positioning bosses on the connecting rod blank surface; the connecting rod bolt hole and the fine boring hole are both processed with the rough boring hole as the positioning reference, and the process reference is unified, which solves the verticality problem of the fine boring hole and the bolt hole; the process block can adjust the position according to the size of the rough boring hole, and the process block and the saddle hole are processed together to solve the accuracy problem caused by uneven force in the saddle hole processing; in addition, after the saddle hole processing is completed, the connecting rod does not need to be removed for inspection, and the boring tool size is adjusted according to the inspection results to continue processing, which solves the problem of unqualified size caused by boring tool wear in batch processing of saddle holes.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: the connecting rod processing tooling provided by the present invention has lower cost and wider application; there is no need to set a positioning boss when designing the connecting rod blank, the forging processability is good, and the finished product will not have any positioning boss left over, which will not affect the final size of the product; the saddle hole processing size is stable, and a cylinder gauge can be used for direct detection, the detection operation is simple, and the application is wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a schematic diagram of a top view of a connecting rod processing tool placed with a connecting rod according to the present invention.

[0037] Figure 2 It is a cross-sectional view of the connecting rod in the present invention when it is in a fully positioned state.

[0038] Figure 3 Display as Figure 2 Enlarged view of point A in the middle.

[0039] Figure 4 Shown is a cross-sectional view of the present invention in its initial state.

[0040] Figure 5 Display as Figure 4 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0041] See also Figure 1-Figure 5 The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0043] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings as understood by persons having ordinary skills in the field to which the present invention belongs. The terms "first", "second", etc. used in the present invention are used to distinguish different objects, rather than to describe a specific order, quantity or importance. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The term "connection" in the present invention includes direct and indirect connections unless otherwise specified.

[0044] Embodiment 1

[0045] like Figure 1-Figure 5 As shown, this embodiment provides a connecting rod processing tool 100, which is used for positioning and clamping the connecting rod 200 to facilitate the rough boring, fine boring and other processing of the connecting rod 200. In this embodiment, the connecting rod 200 is a saddle-shaped structure connecting rod, including a rod body 210, a connecting rod small head 220 and a connecting rod big head 230 respectively connected to the two ends of the rod body 210, and the connecting rod small head 220 is a non-circular structure. Specifically, the connecting rod processing tool 100 includes a base 110, a limit block 120, a first positioning mandrel 130, a second positioning mandrel 140, a process block 150 and a dial indicator 160.

[0046] The base 110 is a mounting base for positioning parts such as the limit block 120, the first positioning mandrel 130, the second positioning mandrel 140, the process block 150 and the dial indicator 160. Specifically, the base 110 is provided with a first mounting groove 111, a second mounting groove 112 and a slide groove 113. The first mounting groove 111 and the second mounting groove 112 are both circular grooves. The radius of the first mounting groove 111 is greater than the radius of the second mounting groove 112, and they are used to install the first positioning mandrel 130 and the second positioning mandrel 140 respectively. The slide groove 113 is arranged close to the end of the second mounting groove 112 away from the first mounting groove 111, and the center line of the first mounting groove 111 and the second mounting groove 112 is collinear with the center line of the slide groove 113.

[0047] The limit block 120 is arranged between the first mounting groove 111 and the second mounting groove 112, and can be fixed on the upper end surface of the base 110 by screws, and is used to position and place the rod 210. Specifically, a limit groove 121 matching the rod 210 is arranged on the upper end surface of the limit block 120, and the center of the limit groove 121 is located on the center line of the first mounting groove 111 and the second mounting groove 112. The number of limit blocks 120 can be two, so as to ensure that the limit block 120 can limit the position of the rod 210, and can prevent the connecting rod 200 from rotating on the horizontal plane due to force during the processing. When the rod 210 is placed in the limit groove 121, the fixing stud group pre-installed on the base 110 can be used to clamp the rod 210 on the limit block 120, thereby limiting the displacement of the rod 210 in the vertical direction.

[0048] The first positioning mandrel 130 is movably installed in the first mounting groove 111, and can be lifted and lowered in the first mounting groove 111 to limit the large head hole of the connecting rod large head 230. Specifically, the first positioning mandrel 130 is a cylinder, and its outer end surface is matched with the first mounting groove 111 in a clearance, and the outer end surface can be matched with the large head hole of the connecting rod large head 230 to prevent the connecting rod 200 from being displaced on the horizontal plane due to force during the processing. Further, in this embodiment, an internal thread and a lifting screw 170 connected to the internal thread are provided in the center hole of the first positioning mandrel 130, and the external thread of the lifting screw 170 is matched with the internal thread in a clearance, so that by rotating the lifting screw 170 clockwise, the thread drives the first positioning mandrel 130 to rise in the first mounting groove 111; by rotating the lifting screw 170 counterclockwise, the first positioning mandrel 130 is lowered and reset in the first mounting groove 111 under the action of its own gravity. In other embodiments, the lifting and lowering of the first positioning spindle 130 may also be controlled by connecting a hydraulic cylinder to the first positioning spindle 130 .

[0049] The second positioning mandrel 140 is movably installed in the second mounting groove 112, and can be raised and lowered in the second mounting groove 112 to limit the small head hole of the connecting rod small head 220. Since the small head hole of the connecting rod small head 220 is not a full circle, and in the process of large-scale rough boring, there will be deviations in the center distance size and the small head hole diameter size of different connecting rods 200. In order to compensate for the deviation, ensure that the center connection line of the large and small head holes can be corrected, and limit the rotation of the connecting rod 200, the second positioning mandrel 140 can be designed as a cylinder with a truncated cone on the upper section, that is, the upper section 141 of the outer end surface of the second positioning mandrel 140 is inclined to its center, and the inclination angle is less than 0.5°, such as 0.1°, 0.2° and 0.3°. The lower section 142 of the outer end surface of the second positioning mandrel 140 is a cylindrical surface, which is clearance-matched with the second mounting groove 112, and the upper section 141 of the outer end surface is matched with the small head hole of the connecting rod small head 220. Furthermore, in this embodiment, an internal thread and a lifting screw 170 connected to the internal thread are provided in the center hole of the second positioning mandrel 140, and the external thread of the lifting screw 170 is in clearance with the internal thread, so that by rotating the lifting screw 170 clockwise, the thread drives the second positioning mandrel 140 to rise in the second installation slot 112; by rotating the lifting screw 170 counterclockwise, the second positioning mandrel 140 descends and resets in the second installation slot 112 under the action of its own gravity. In other embodiments, the lifting and lowering of the second positioning mandrel 140 can also be controlled by connecting a hydraulic cylinder to the second positioning mandrel 140.

[0050] Furthermore, in order to improve the lifting stability of the first positioning mandrel 130 and the second positioning mandrel 140, a first guide column 181 and a second guide column 182 can be respectively arranged in the first mounting groove 111 and the second mounting groove 112, and guide holes are respectively arranged outside the center holes of the first positioning mandrel 130 and the second positioning mandrel 140. The outer end surfaces of the first guide column 181 and the second guide column 182 are cylindrical surfaces, and the bottoms of the first guide column 181 and the second guide column 182 are respectively interference-mounted in the pin holes of the first mounting groove 111 and the second mounting groove 112, and the first positioning mandrel 130 and the second positioning mandrel 140 are respectively mounted on the first guide column 181 and the second guide column 182 through their respective guide holes, and the first guide column 181 and the second guide column 182 are respectively clearance-matched with the guide holes of the first positioning mandrel 130 and the second positioning mandrel 140. Two first guide pillars 181 and two second guide pillars 182 may be respectively provided and arranged symmetrically to ensure that the first positioning mandrel 130 or the second positioning mandrel 140 is subjected to uniform force during the rising process along the first guide pillar 181 or the second guide pillar 182 .

[0051] Furthermore, in some embodiments, in order to ensure that the first positioning spindle 130 and the second positioning spindle 140 can be accurately positioned after rising to a specific position, a groove can be set on the side walls of the first mounting groove 111 and the second mounting groove 112 respectively, and a limit assembly 190 can be set on the outer end faces of the first positioning spindle 130 and the second positioning spindle 140. The limit assembly 190 includes a positioning ball that cooperates with the groove and a spring that tightens the positioning ball in the groove. When the first positioning spindle 130 and the second positioning spindle 140 rise to the position of the groove in the first mounting groove 111 and the second mounting groove 112, the positioning ball is positioned and snapped into the groove under the action of the spring pre-pressure.

[0052] The process block 150 is slidably installed in the slide groove 113 and can move along the slide groove 113. One end of the process block 150 facing the second positioning mandrel 140 is an arc surface that can cooperate with the second positioning mandrel 140. The process block 150 can be moved left and right manually, or driven by a driving device such as a hydraulic cylinder, a cylinder or a linear module. When the process block 150 moves to abut against the second positioning mandrel 140, the fixing stud group pre-installed on the base 110 can be used to clamp the process block 150 on the base 110.

[0053] The dial indicator 160 is movably mounted on the base 110 and is used to check whether the connecting rod 200 is completely positioned after installation.

[0054] In addition, if Figure 1 As shown, the first mounting groove 111 and the second mounting groove 112 may be respectively provided with a first iron chip baffle 101 and a second iron chip baffle 102, which are used to prevent iron chips generated during processing from falling onto the first positioning mandrel 130 and the second positioning mandrel 140, and to avoid iron chips from clogging the gap between the first positioning mandrel 130 / the second positioning mandrel 140 and the first mounting groove 111 / the second mounting groove 112, thereby affecting the lifting and lowering effects of the first positioning mandrel 130 and the second positioning mandrel 140. Specifically, the first chip baffle 101 and the second chip baffle 102 are designed to be movable in a direction perpendicular to the rod body 210. Before the first positioning mandrel 130 and the second positioning mandrel 140 are lifted to position the connecting rod 200, the first chip baffle 101 and the second chip baffle 102 are removed from the first mounting groove 111 and the second mounting groove 112; when the positioning of the connecting rod 200 is completed and the first positioning mandrel 130 and the second positioning mandrel 140 are lowered into the first mounting groove 111 and the second mounting groove 112, the first chip baffle 101 and the second chip baffle 102 are moved to completely cover the first mounting groove 111 and the second mounting groove 112, and then precision boring is performed.

[0055] Embodiment 2

[0056] This embodiment provides a method for using a connecting rod processing tool, using the connecting rod processing tool 100 as described in the first embodiment to position and clamp the connecting rod 200 to facilitate rough boring, fine boring and other processing of the connecting rod 200, specifically including:

[0057] Step 1: In the initial state of the connecting rod processing tool 100, the first positioning mandrel 130 and the second positioning mandrel 140 are respectively lifted to a specified height;

[0058] Specifically, the initial state of the connecting rod processing tool 100 is that the upper end surfaces of the first positioning mandrel 130 and the second positioning mandrel 140 are located below the upper end surface of the base 110 .

[0059] In this embodiment, “lifting the first positioning spindle 130 and the second positioning spindle 140 to a specified height” specifically includes: rotating the lifting screw 170 in the center hole of the first positioning spindle 130 and the second positioning spindle 140 clockwise to lift the first positioning spindle 130 along the first guide column 181 and lift the second positioning spindle 140 along the second guide column 182; when the limiting assembly 190 on the side wall of the first positioning spindle 130 is positioned and inserted into the side wall groove of the first mounting groove 111, the lifting screw 170 in the center hole of the first positioning spindle 130 is stopped from rotating; when the limiting assembly 190 on the side wall of the second positioning spindle 140 is positioned and inserted into the side wall groove of the second mounting groove 112, the lifting screw 170 in the center hole of the second positioning spindle 140 is stopped from rotating.

[0060] In other embodiments, whether the height is raised to the specified height may be determined by the number of rotations, the height measured by a measuring tool, etc.

[0061] Step 2: The big end hole of the connecting rod big end 230 and the small end hole of the connecting rod small end 220 are respectively mounted on the first positioning mandrel 130 and the second positioning mandrel 140, and the lower end surface of the rod body 210 is against the limit block 120;

[0062] At this time, since the upper section 141 of the outer end surface of the second positioning mandrel 140 is inclined toward its center hole, the second positioning mandrel 140 is not lifted into place, and the connecting rod 200 is in an incompletely positioned state. The connecting rod 200 can rotate slightly on the limit block 120 with the large head hole of the connecting rod large head 230 as the center;

[0063] Step 3: Move the dial indicator 160 until the pointer contacts the end surface of the connecting rod small end 220. No need to record the reading.

[0064] Step 4: Continue to lift the second positioning mandrel 140 until the reading of the dial indicator 160 starts to change and then stop lifting the second positioning mandrel 140;

[0065] Specifically, while continuing to lift the second positioning mandrel 140, the upper section 141 on the outer end surface of the second positioning mandrel 140 automatically corrects the center line of the large head hole of the connecting rod big end 230 and the small head hole of the connecting rod small end 220, and compensates for the center distance size deviation and the small head hole diameter size deviation of different connecting rods 200, until the reading of the dial indicator 160 begins to change, and then the second positioning mandrel 140 is stopped from being lifted. At this time, the connecting rod 200 is in a fully positioned state.

[0066] Step 5: Move the process block 150 along the slide groove 113 until it is close to the second positioning mandrel 140, and the lower end surface of the process block 150 is coplanar with the lower end surface of the small head hole of the connecting rod small head 220. At this time, the distance between the generatrix of the process block 150 and the generatrix of the small head hole of the connecting rod small head 220 is the rough boring size of the small head hole after compensation;

[0067] Step 6: Use a fixing bolt group to clamp and fix the connecting rod 200 and the process block 150;

[0068] Step 7: Lower the first positioning mandrel 130 and the second positioning mandrel 140 to below the upper end surface of the base 110;

[0069] Specifically, in this embodiment, the first positioning spindle 130 and the second positioning spindle 140 are lowered by rotating the lifting screw 170 in the center holes of the first positioning spindle 130 and the second positioning spindle 140 counterclockwise.

[0070] Step 8: Fine boring the large head hole and the small head hole of the connecting rod 200. After fine boring is completed, the process hole composed of the small head hole (saddle hole) and the process block 150 can be directly checked using a cylinder gauge; as the number of processes increases, the boring tool wears out, and the boring tool size can be adjusted according to the real-time detected small head hole size to continue processing until the small head hole is processed to a qualified standard;

[0071] Step nine: release the fixing bolts on the connecting rod 200 and the process block 150, remove the connecting rod 200, and move the process block 150 to the initial position.

[0072] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A connecting rod processing tool, characterized in that: include A base, on which a first mounting groove, a second mounting groove and a slide groove are formed, wherein a center line connecting the first mounting groove and the second mounting groove is colinear with a center line of the slide groove; A limit block is fixed on the upper end surface of the base and is located between the first mounting groove and the second mounting groove. A limit groove is arranged on the upper end surface of the base, and the center of the limit groove is located on the center line of the first mounting groove and the second mounting groove. A first positioning mandrel, movably mounted in the first mounting groove; A second positioning mandrel, movably mounted in the second mounting groove, wherein the upper section of the outer end surface of the second positioning mandrel is inclined toward the center thereof; The process block is slidably installed in the slide groove, and one end of the process block facing the second positioning core shaft is an arc surface that matches the second positioning core shaft.

2. The connecting rod processing tool according to claim 1, characterized in that: The inclination angle of the upper section of the outer end surface is less than 0.5°.

3. The connecting rod processing tool according to claim 2, characterized in that: The center holes of the first positioning mandrel and the second positioning mandrel are respectively provided with internal threads and lifting screws connected to the internal threads, and the external threads of the lifting screws are in clearance fit with the internal threads.

4. The connecting rod processing tool according to claim 3, characterized in that: The first and second guide columns are respectively arranged in the first installation groove and the second installation groove, and guide holes are respectively arranged outside the center holes of the first positioning mandrel and the second positioning mandrel; the first positioning mandrel and the second positioning mandrel are respectively mounted on the first and second guide columns.

5. The connecting rod processing tool according to claim 4, characterized in that: At least two of the first guide posts and the second guide posts are provided respectively and are symmetrically arranged.

6. The connecting rod processing tool according to claim 3, characterized in that: A groove is respectively arranged on the side walls of the first installation groove and the second installation groove, and a limiting assembly is respectively arranged on the outer end surfaces of the first positioning mandrel and the second positioning mandrel; When the limiting assembly is inserted into the groove, the first positioning spindle and the second positioning spindle are lifted into place.

7. The connecting rod processing tool according to claim 6, characterized in that: The limiting assembly includes a positioning ball matched with the groove and a spring that tightens the positioning ball in the groove.

8. The connecting rod processing tool according to claim 1, characterized in that: It also includes a dial indicator, which is movably installed on the base and is used to check whether the connecting rod is completely positioned after installation.

9. The connecting rod processing tool according to claim 1, characterized in that: The first installation slot and the second installation slot are respectively provided with a first iron chip baffle and a second iron chip baffle.

10. A method for using a connecting rod processing tool, characterized in that: Using the connecting rod processing tool as described in any one of claims 1 to 9 to position and clamp the connecting rod for processing, comprising the steps of: In the initial state of the connecting rod processing tooling, the first positioning mandrel and the second positioning mandrel are respectively lifted to a specified height; The big end hole of the big end of the connecting rod and the small end hole of the small end of the connecting rod are respectively sleeved on the first positioning mandrel and the second positioning mandrel, and the lower end surface of the rod body is against the limit block; Move the dial indicator until the pointer contacts the end surface of the connecting rod; Continue to lift the second positioning mandrel until the reading of the dial indicator starts to change and then stop lifting the second positioning mandrel; The process block is moved along the slide groove until it is close to the second positioning core shaft, and the lower end surface of the process block is coplanar with the lower end surface of the small head hole; After fixing the connecting rod and the process block, lowering the first positioning mandrel and the second positioning mandrel to below the upper end surface of the base; The large head hole and the small head hole of the connecting rod are precision bored. After the precision boring is completed, the size of the process hole composed of the small head hole and the process block is directly checked and the boring tool size is adjusted to continue processing until the small head hole is processed to be qualified.

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