CN104759840A - Processing technique of remanufactured connecting rod - Google Patents

Abstract

The invention provides a processing technology for remanufacturing connecting rods, including: calibration datum plane: finely grinding the connecting rod end face of the connecting rod with a surface grinder; pre-processing: using the connecting rod end face of the connecting rod as a reference, boring the The diameter of the big head hole to the first preset size; remanufacturing and repair: based on the connecting rod end face of the connecting rod, use nano-brush plating to repair the diameter of the big head hole to the second preset size; cleaning: clean the surface dirt of the connecting rod and flatten the end face of the connecting rod; replacement of copper bushing: based on the end face of the connecting rod, use a press to press a new copper bushing with a small head hole; chamfering processing: based on the end face of the connecting rod, use a fillet forming knife, Small head hole fillet and large head hole fillet; small head hole processing: based on the end face of the connecting rod, semi-finish boring, fine boring small head hole copper sleeve hole to standard size ; Big head hole processing: take the end face of the connecting rod as the reference, and take the copper sleeve hole of the small head hole as the auxiliary reference, process the diameter of the big head hole to the standard size Φ. This process reduces processing man-hours and improves processing accuracy.

Description

A Processing Technology for Remanufacturing Connecting Rod

technical field

The invention relates to the field of remanufacturing, in particular to a processing technology for remanufacturing connecting rods.

Background technique

The connecting rod mainly includes a big end, a small end, a connecting rod cover and a shaft, and the connecting rod cover and the shaft are connected by bolts. Since the connecting rod is a die forging, the machining allowance of the hole is large, and a large stress will be generated during cutting, which will cause the deformation of the connecting rod. Therefore, the processing technology of new connecting rods is usually divided into rough machining and finishing. The commonly used processing routes are: 1. Milling large and small head planes - 2. Rough grinding plane - 3. Drilling, expanding and reaming small head holes - 4 .Milling the side—5. Enlarging the head hole—6. Milling the joint surface of the connecting rod cover and the shaft—7. Grinding the joint surface—8. Countersinking the bolt connection surface—9. Drilling, expanding, and reaming the bolt holes—10. Fitter connection Rod cover and shaft - 11. Rough boring big head hole - 12. Inverted big head hole fillet - 13. Fine grinding large and small end faces - 14. Semi-fine boring large and small head holes - 15. Fine boring large and small ends Hole—16. Fitter Calibration Balance—17. Drill Connecting Rod Body Small Head Oil Hole—18. Press Small Head Hole Copper Bushing—19. Invert Small Head Hole Fillet—20. Semi-fine Boring, Fine Boring Small Head Hole Copper Bushing Hole - 21 honing big head hole - inspection, rust prevention, storage.

To sum up, the processing process of the new connecting rod is a complex processing process. However, the connecting rod is a key part of the engine. When it is working, the small end is connected to the piston through the piston pin, and the gas pressure acting on the piston is transmitted to the connected crankshaft through the large end, thereby realizing the reciprocating motion of the piston and the rotary motion of the crankshaft. transformation. However, in addition to bearing the alternating pressure of the piston, the small end hole and the big end hole are also subject to the crankshaft reaction force with random characteristics; so the small end hole and the big end hole of the connecting rod are prone to damage. If a large amount of damaged connecting rods are scrapped, it will inevitably cause great loss and waste. In order to reduce the loss of the damaged connecting rod, the most effective method at present is to remanufacture and repair the damaged connecting rod. Therefore, the present invention provides a processing technology for remanufacturing the connecting rod.

Contents of the invention

The invention aims to provide a processing technology for remanufacturing connecting rods which can improve the processing accuracy.

The invention provides a processing technology for remanufacturing connecting rods. The processing technology includes: correcting the reference plane: using a surface grinder to finely grind the connecting rod end face of the connecting rod; pre-processing: taking the connecting rod end face of the connecting rod as a reference, The diameter of the big head hole of the connecting rod reaches the first preset size; remanufacturing and repairing: based on the connecting rod end face of the connecting rod, the diameter of the big head hole is repaired to the second preset size by nano-brush plating; cleaning: cleaning the connecting rod surface dirt, and flatten the end face of the connecting rod; replacement of copper sleeve: use a press to press a new copper sleeve with a small head hole based on the end face of the connecting rod; chamfering processing: use fillet forming based on the end face of the connecting rod Knife, fillet of small head hole and large head hole; small head hole processing: based on the end face of the connecting rod, semi-fine boring, fine boring small head hole copper bushing to the standard size φ; big head hole processing: using the connecting rod The end face is used as the reference, and the copper sleeve hole of the small head hole is used as the auxiliary reference, and the diameter of the big head hole is processed to the standard size Φ.

Further, the first preset size is a standard size Φ-0.2mm.

Further, the second preset size is the standard size Φ+0.3mm.

Further, the machining of the big head hole includes: rough machining of the big head hole: taking the end face of the connecting rod as the reference, and taking the copper sleeve hole of the small head hole as the auxiliary reference, fine boring the diameter of the big head hole to the standard size Φ+0.1mm; finishing the big head hole: Taking the end face of the connecting rod as the reference and the copper sleeve hole of the small head hole as the auxiliary reference, honing the diameter of the big head hole to the standard size Φ.

Further, the processing technology also includes pre-processing the connecting rod before correcting the datum plane, wherein the pre-processing includes dismantling, cleaning, testing and replacing the connecting bolts of the connecting rod.

According to the processing technology of the remanufactured connecting rod of the present invention, the big head hole of the connecting rod is repaired by using nano electric brush plating, which can effectively save the process flow, and the processing allowance possessed by the nano electric brush plating repair technology is small (0.15mm on one side) , high precision and low cost, can effectively reduce the machining allowance and processing man-hours of the big head hole of the connecting rod, and improve the machining accuracy.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the schematic diagram of the front view structure of the remanufactured connecting rod of the present invention;

Fig. 2 is a schematic cross-sectional view along the line A-A of Fig. 1 .

Explanation of reference signs:

1. End face of big head; 2. Hole of big head; 3. Hole of small head; 4. End face of small head; 5. Shaft; 6. Connecting rod cover; 7. Bolt; 10, copper sleeve hole.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in Fig. 1 and Fig. 2, the processing technology of remanufacturing connecting rod according to the present invention comprises the following steps:

1. Pretreatment: clean the damaged connecting rod by the fitter, disassemble the bolt 7, remove the small head hole copper sleeve 9, etc., and inspect the damage degree of the damaged connecting rod to judge the remanufacturing applicability of the damaged connecting rod. Manufacture the required damaged connecting rod, and use a new bolt 7 to connect the connecting rod cover 6 and the rod body 5 .

2. Calibration datum plane: Use a surface grinder to finely grind the big end face 1 and the small end end face 4 of the connecting rod, and calibrate the processing datum plane of the connecting rod.

3. Pre-processing: the pre-treatment of nano brush plating, based on the big end face 1 and the small end face 4 of the connecting rod, the small end hole 3 is assisted by a dummy pin for positioning, and the big end hole 2 of the connecting rod is finely bored to the standard size Φ -0.2mm.

4. Remanufacturing repair: that is, brush plating to form a nano brush coating 8, based on the big end face 1 and the small end face 4 of the connecting rod, the nano brush plated big head hole 2 to the standard size Φ+0.3mm.

5. After cleaning and brush plating, the fitter removes the dirt on the surface of the remanufactured and repaired connecting rod, and smooths the big end face 1 and the small end face 4 of the connecting rod.

6. Copper sleeve replacement: Use a press to press in a new copper sleeve 9 with a small head hole and squeeze the copper sleeve hole 10 based on the end face 1 of the large end and the end face 4 of the small end.

7. Chamfering processing: use a fillet forming knife, based on the end face 1 of the big head and the end face 4 of the small head, round the corners of the small head hole and the big head hole.

8. Small head hole processing: Based on the end face 1 of the big head and the end face 4 of the small head, semi-fine boring and fine boring small head hole copper sleeve hole 10 to the standard size φ.

9. Big head hole processing: including big head hole rough machining and big head hole finishing; big head hole rough machining adopts boring process, based on big head end face 1 and small head end face 4, using dummy pin and small head hole copper sleeve hole 10 As an auxiliary reference, finely bore the big head hole 2 to the standard size Φ+0.1mm; the big head hole is finished, using the honing process, that is, using the big head end face 1 and the small head end face 4 as the reference, using a dummy pin to cover the small head hole with copper 10 is an auxiliary datum, honing the big head hole 2 to the standard size Φ.

10. Inspection and anti-rust treatment: inspect the geometric accuracy and technical requirements of the remanufactured connecting rods, apply anti-rust oil and anti-rust treatment to the qualified connecting rods, and store them in the warehouse.

From the above description, it can be seen that the above-mentioned embodiments of the present invention have achieved the following technical effects:

According to the processing technology of the remanufactured connecting rod of the present invention, the processing technology of the remanufactured connecting rod based on nano-brush plating technology repair is mainly reflected in the processing process of the big end hole of the connecting rod, and the processing allowance possessed by the repair technology of nano-brush plating Small (unilateral 0.15mm), high precision and low cost. Therefore, the man-hours for remanufacturing and repairing the large end hole of the connecting rod are less. A comprehensive comparison of the processing process of the remanufactured connecting rod and the processing process of the new connecting rod shows that the processing process of the remanufactured connecting rod greatly reduces the processing process of the new connecting rod; Repair is the focus of processing. Based on the inherent good geometric characteristics of damaged connecting rods, the processing time is much lower than that of new products, so that a processing technology for remanufacturing connecting rods has very superior manufacturability and economy. The goal of green manufacturing and circular economy of manufacturing technology provides technical support.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A processing technology for remanufacturing connecting rod, characterized in that, the processing technology comprises: Calibration datum plane: using a surface grinder to finely grind the connecting rod end face of the connecting rod; Pre-processing: using the connecting rod end face of the connecting rod as a reference, boring the diameter of the big head hole of the connecting rod to a first preset size; Remanufacturing and repairing: taking the connecting rod end face of the connecting rod as a reference, using nano-brush plating to repair the diameter of the big head hole to the second preset size; Cleaning: cleaning the dirt on the surface of the connecting rod, and leveling the end face of the connecting rod; Replacement of copper sleeve: Based on the end face of the connecting rod, use a press to press in a new copper sleeve with a small head hole; Chamfering processing: Based on the end face of the connecting rod, use a fillet forming knife to chamfer the fillets of the small head hole and the big head hole; Small head hole processing: based on the end face of the connecting rod, semi-finish boring, fine boring small head hole copper sleeve hole to standard size Big head hole processing: take the end face of the connecting rod as the reference, and take the small head hole copper sleeve hole as the auxiliary reference, process the diameter of the big head hole to the standard size Φ. 2. The processing technology of remanufacturing connecting rod according to claim 1, characterized in that, The first preset size is a standard size Φ-0.2mm. 3. The processing technology of remanufacturing connecting rod according to claim 1, characterized in that, The second preset size is the standard size Φ+0.3mm. 4. The processing technology for remanufacturing connecting rod according to claim 1, characterized in that, the processing of the big head hole comprises: Rough machining of the big head hole: taking the end face of the connecting rod as the reference and the copper bushing hole of the small head hole as the auxiliary reference, fine-boring the diameter of the big head hole to the standard size Φ+0.1mm; Finishing of the big head hole: using the end face of the connecting rod as the reference and the copper sleeve hole of the small head hole as the auxiliary reference, honing the diameter of the big head hole to the standard size Φ. 5. The processing technology of remanufacturing connecting rod according to claim 1, characterized in that, The processing technology also includes pre-processing the connecting rod before correcting the datum plane, wherein the pre-processing includes disassembling, cleaning, testing and replacing the connecting bolts of the connecting rod.