Vehicle connecting rod and its manufacturing process

Abstract

The invention discloses a vehicle connecting rod and a manufacturing process thereof, which solves the problem that if the weight of the connecting rod is easily reduced, the supporting strength of the automobile connecting rod component may be poor, and the damage rate is high when subjected to external force strength during use. The key points of the technical solution are that the vehicle connecting rod comprises a small head, a rod body and a large head which are connected in sequence, and is characterized in that: the rod body is provided with a long strip-shaped weight-reducing hole, a plurality of reinforcing rods are inserted in the weight-reducing hole, a pair of plug holes are provided on the inner wall of the weight-reducing hole, and the two ends of the reinforcing rod are inserted in the plug holes; the manufacturing process of the vehicle connecting rod comprises: determining the size, hot pressing die forging, placing the material flat in the groove for die forging once to forge an outer shape with the weight-reducing hole, forming a slot at the edge of the weight-reducing hole, cooling the connecting rod, and inserting the reinforcing rod into the plug hole, so as to achieve the purpose of ensuring the structural strength of the connecting rod on the basis of reducing the weight of the connecting rod.

Description

Technical Field

[0001] The present invention relates to a connecting rod, and more particularly to a connecting rod for a vehicle and a manufacturing process thereof. Background Art

[0002] Conventional connecting rods are made of welded, forged or cast aluminum parts, which are generally consistent with the thickness of the mounting boss and are heavy, making the overall weight of the engine heavier;

[0003] However, if the mass of the connecting rod is easily reduced, it may lead to poor supporting strength of the automobile connecting rod component, and the damage rate is high when it is subjected to external force during use. Summary of the invention

[0004] The first object of the present invention is to provide a vehicle connecting rod, which adopts a reinforcing rod for support added in the weight-reducing hole to achieve the purpose of ensuring the structural strength of the connecting rod while reducing the weight of the connecting rod.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A vehicle connecting rod, comprising a small head, a rod body and a large head connected in sequence, the rod body is provided with a long strip-shaped weight-reducing hole, and a plurality of reinforcing rods are inserted into the weight-reducing hole;

[0006] The inner wall of the weight-reducing hole is provided with a pair of insertion holes, and the two ends of the reinforcing rod are inserted into the insertion holes;

[0007] The reinforcing rod comprises a fixed rod and a movable rod, the movable rod is extended in one direction and slides on the fixed rod, and an elastic buckle is provided between the movable rod and the fixed rod to fix the fixed rod in the extended position;

[0008] The fixed rod includes a radially sliding clamping block, and an elastic block is arranged inside the fixed rod to push the clamping block to slide out radially; the movable rod is sleeved on the fixed rod, and a radial clamping groove is provided on the movable rod;

[0009] When the moving rod and the fixed rod are extended to a predetermined position relative to each other, the clamping block slides into the clamping groove to realize the axial locking of the moving rod and the fixed rod;

[0010] The clamping blocks are spirally distributed on the fixed rod, and the clamping grooves are spirally arranged on the moving rod.

[0011] By adopting the above technical solution, the purpose of setting the weight-reducing hole is to reduce the weight of the connecting rod;

[0012] The purpose of adding a reinforcing rod in the weight-reducing hole is to avoid weakening the structural strength of the connecting rod at the weight-reducing hole after the weight-reducing hole is opened. The reinforcing rod can be fixed by welding or clamping after being inserted into the weight-reducing hole. The advantage of this design is that it avoids the connection process of the reinforcing rod on the weight-reducing hole. At the beginning of this design, an attempt was made to continuously forge multiple weight-reducing holes on the rod body to form a reinforcing rod body with a gap of 1-3mm between the weight-reducing holes. However, after multiple forgings, due to the large tonnage of the forging equipment, such a small gap reinforcement is difficult to stamp under high pressure. In multiple tests, the reinforcing rod was twisted and broken. Therefore, after multiple designs, the reinforcing rod added later in this design was adopted to form a lightweight and strong automotive connecting rod, which has a positive effect on the development of my country's automobile industry.

[0013] The sockets are used to position and install the reinforcing rods, and the paired sockets facilitate quick insertion of both ends of the reinforcing rods.

[0014] Since the fixed rod and the movable rod can slide, the movable rod and the fixed rod are first kept in a shortened state. When the fixed rod is inserted into the socket, the movable rod is extended. When the movable rod is inserted into another socket, the elastic buckle is extended to axially fix the fixed rod and the movable rod, making it difficult for the fixed rod and the movable rod to slide axially. Therefore, when the pressure on the weight-reducing hole is transmitted, the fixed rod and the movable rod can transmit pressure to each other, thereby greatly improving the structural strength of the rod body.

[0015] When the fixed rod and the movable rod are in a retracted state, the block is difficult to move because the sliding path of the block is blocked by the rod wall of the passive rod; when the movable rod moves to a predetermined extended position, the block coincides with the slot, and under the thrust of the elastic block, the block is blocked on the slot, making it difficult for the movable rod and the fixed rod to retract axially, so that the fixed rod and the movable rod can support the side wall of the weight-reducing hole. Obviously, the one-way telescopic reinforcement rod is easy to install on the connecting rod, which speeds up the installation process of the connecting rod.

[0016] Preferably, the clamping block is provided with a stopper, and the stopper abuts against the inner wall of the fixed rod to limit the clamping block from slipping off the fixed rod.

[0017] By adopting the above technical solution, if the thrust of the elastic block is greater than the friction between the card block and the card slot, the card block will easily slide out of the card slot. In order to avoid such a situation, the stopper has a good blocking effect.

[0018] Preferably: a slider and a limit groove are provided between the fixed rod and the movable rod, and the slider slides in the limit groove to constrain the sliding tracks of the fixed rod and the movable rod.

[0019] By adopting the above technical solution, the positioning and sliding of the slider in the limiting groove enables the sliding trajectory between the movable rod and the fixed rod to be predetermined, so that the clamping block and the clamping groove can be accurately matched.

[0020] Preferably: the shaft is provided with a single marking pointing to the socket.

[0021] By adopting the above technical solution, the lengths of the reinforcing rods are different at different positions of the weight-reducing holes, and the lengths of the reinforcing rods can be predetermined. The setting of a single mark is conducive to the precise installation of the reinforcing rods in different sockets.

[0022] The second purpose of the present invention is to provide a manufacturing process for a vehicle connecting rod, which utilizes a new connecting rod processing technology to smoothly add a supporting reinforcing rod to the weight-reducing hole, thereby achieving the purpose of ensuring the structural strength of the connecting rod while reducing the weight of the connecting rod.

[0023] A manufacturing process of a vehicle connecting rod, comprising:

[0024] (1) Determine the size: Determine the forging size of the connecting rod;

[0025] (2) Pretreatment of the blank: First, the decarburization layer and defects on the surface of the blank are removed by a grinder, then the blank is washed in tap water to remove dust, and then dried with a hot air blower. After drying, the surface of the blank is coated with a high temperature resistant and anti-oxidation anti-decarburization coating;

[0026] (3) Heating: Heating the blank in a high temperature furnace with a furnace temperature of 800-900°C and a holding time of 40-50 minutes to soften the blank;

[0027] (4) Hot press die forging: The die forging equipment is a 7500kN friction press. First, the oxide layer of the softened blank is removed, and then the blank is flattened on the upsetting table of the forging die. After that, the blank is placed flat in the groove for die forging to form a shape with a weight-reducing hole, and a slot is formed at the edge of the weight-reducing hole.

[0028] (5) Place the insert ring in the slot, and place the cover insert ring blank in the slot, perform secondary die forging and pressing, heat cut off the excess edge, anneal after trimming, place the parts in an electric furnace at 120-180°C for annealing, and the annealing time is 20 minutes;

[0029] (6) Finishing: Use a grinding wheel cutter to cut the material, and then use a grinding wheel grinder for further finishing; measure and calibrate the dimensions of each part of the connecting rod. If the error is ≥1.0mm, continue to use the grinding wheel to cut and cut the material. If the error is <1.0mm, further finishing is performed;

[0030] (7) Allow the connecting rod to cool and insert the reinforcing rod into the socket.

[0031] Preferably: eddy current sorting is performed in step (6).

[0032] Preferably: after eddy current sorting, flaw detection is performed.

[0033] By adopting the above technical solution, a slot is formed by forging, and an insert ring (i.e., an insert hole) is placed in the slot. A heated blank is added into the gap of the slot, and then secondary forging is performed, so that the slot is completely pressed into a whole.

[0034] In summary, the present invention has the following beneficial effects: The advantages of the invention are: the effective cooperation between the weight-reducing hole and the reinforcing rod improves the overall structural strength of the connecting rod. By continuously improving the connecting rod production and manufacturing technology, high-quality connecting rods are provided to major automobile manufacturers, thereby improving the competitiveness of domestic automobile brands. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a top view of Example 1;

[0036] Figure 2 is a longitudinal cross-sectional schematic diagram of the reinforcing rod in Example 1;

[0037] Figure 3 It is a structural schematic diagram of the fixed rod in Example 1.

[0038] In the figure:

[0039] 11. Small head; 12. Shaft; 13. Large head;

[0040] 2. Weight reduction hole; 21. Socket;

[0041] 3. Strengthening rod; 31. Fixed rod; 32. Moving rod;

[0042] 4. Elastic buckle; 41. Card block; 42. Elastic block; 43. Card slot;

[0043] 5. Stopper;

[0044] 61. Sliding block; 62. Limiting groove;

[0045] 7. Single mark. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0047] Embodiment 1, as Figure 1 and Figure 2 and Figure 3 As shown, the vehicle connecting rod includes a small head 11, a rod body 12 and a large head 13 connected in sequence. The rod body 12 is in the shape of an elongated strip and is provided with an elongated weight-reducing hole 2. The weight-reducing hole 2 is through-through and six reinforcing rods 3 are inserted into the weight-reducing hole 2.

[0048] A pair of insertion holes 21 are provided on the inner wall of the weight-reducing hole 2 , and two ends of the reinforcing rod 3 are inserted into the insertion holes 21 .

[0049] The reinforcing rod 3 includes a fixed rod 31 and a movable rod 32 . The movable rod 32 is sleeved on the fixed rod 31 . The movable rod 32 is unidirectionally extended and slid on the fixed rod 31 . An elastic buckle 4 is provided between the movable rod 32 and the fixed rod 31 to fix the fixed rod 31 in the extended position.

[0050] The elastic buckle 4 includes a block 41, a slot 43 and an elastic block 42. The block 41 slides radially on the fixed rod 31, and an elastic block 42 is provided inside the fixed rod 31 to push the block 41 to slide out radially. The elastic block 42 can be a spring or a rubber block; the movable rod 32 is sleeved on the fixed rod 31, and the movable rod 32 has a radial slot 43; when the movable rod 32 and the fixed rod 31 are relatively extended to the position of being inserted into the socket 21, the block 41 slides into the slot 43 to realize the axial locking of the movable rod 32 and the fixed rod 31. At this time, the movable rod 32 and the fixed rod 31 cannot retract, and the extending direction of the movable rod 32 and the fixed rod 31 is blocked by the blocked end of the socket 21.

[0051] The block 41 is fixed with a stopper 5 . The fixed rod 31 is provided with a sliding hole for the block 41 to slide. The stopper 5 is located at the upper end of the sliding hole. Therefore, the stopper 5 abuts against the inner wall of the fixed rod 31 to limit the block 41 from sliding off the fixed rod 31 .

[0052] The fixed rod 31 is fixed with a slider 61 , and the inner wall of the movable rod 32 is provided with a vertical limit groove 62 . The slider 61 slides in the limit groove 62 so that the fixed rod 31 and the movable rod 32 can slide axially, so that the clamping block 41 can be smoothly aligned with the clamping groove 43 .

[0053] The width of the advantageous weight-reducing hole 2 may be different at different sections, so the shaft 12 is provided with a single mark 7 pointing to the insertion hole 21 to identify the insertion holes 21 of different spacings, so as to facilitate the selection of a suitable reinforcing rod 3 to be inserted into the insertion hole 21 .

[0054] The blocks 41 are distributed on the fixed rod 31 in a spiral manner, and the movable rod 32 is provided with a slot 43 that matches the fixed rod 31. The slot 43 is also arranged in a spiral manner. The purpose of this design is to ensure that the fixed rod 31 and the movable rod 32 have a force-bearing slot 43 and a block 41 combination in the circumferential direction, which is beneficial to the pressure transmission between the fixed rod 31 and the movable rod 32 and increases the structural strength of the connecting rod. The spiral arrangement is intended to have a stronger structural strength than a single annular structure arrangement, so that the structural strength of the connecting rod is further improved.

[0055] Embodiment 2 is a manufacturing process of the automotive connecting rod of embodiment 1: a forging process of an automotive connecting rod blank, the steps of which include:

[0056] (1) Determine the size: Determine the forging size of the connecting rod. The forging parameters of this connecting rod are: the height of the small head hole H = 61 mm, the minimum point H1 = 21 mm, the thickness D1 = 8 mm, and the thickness of the wedge end face D2 = 6 mm;

[0057] (2) Pretreatment of the blank: First, the decarburization layer and defects on the surface of the blank are removed by a grinder, then the blank is washed in tap water to remove dust, and then dried with a hot air blower. After drying, the surface of the blank is coated with a high temperature resistant and anti-oxidation anti-decarburization coating;

[0058] (3) Heating: Heating the blank in a high temperature furnace with a furnace temperature of 800-900°C and a holding time of 40-50 minutes to soften the blank;

[0059] (4) Hot press die forging: The die forging equipment is a 7500kN friction press. First, the oxide layer of the softened blank is removed, and then the blank is flattened on the upsetting table of the forging die. After that, the blank is placed flat in the die groove for die forging. The blank is forged in one step. After that, the blank is placed flat in the die groove for die forging to form a shape with a weight-reducing hole. A slot is formed at the edge of the weight-reducing hole.

[0060] (5) Place the insert ring in the slot, and place the cover insert ring blank in the slot, and perform secondary die forging. After the secondary die forging, heat cut off the excess edges, and perform annealing after trimming. Place the parts in an electric furnace at 120-180°C for annealing for 20 minutes;

[0061] (6) Finishing: Use a grinding wheel cutter to cut the material, and then use a grinding wheel grinder for further finishing; measure and calibrate the dimensions of each part of the connecting rod, and if the error is ≥1.0mm, continue to use the grinding wheel to cut the material, and if the error is <1.0mm, then further finishing is performed; secondly, eddy current sorting is performed; after that, after eddy current sorting, flaw detection is performed

[0062] (7) Forging inspection: Cool the connecting rod and insert the reinforcing rod into the socket. Check all indicators of the parts 100%. If all indicators are qualified, they are considered finished products.

[0063] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A vehicle connecting rod, comprising a small head (11), a rod body (12) and a large head (13) connected in sequence, characterized in that: The rod body (12) is provided with a long strip-shaped weight-reducing hole (2), and a plurality of reinforcing rods (3) are inserted into the weight-reducing hole (2); The inner wall of the weight-reducing hole (2) is provided with a pair of insertion holes (21), and the two ends of the reinforcing rod (3) are inserted into the insertion holes (21); The reinforcing rod (3) comprises a fixed rod (31) and a movable rod (32); the movable rod (32) is extended in one direction to slide on the fixed rod (31); and an elastic buckle (4) is provided between the movable rod (32) and the fixed rod (31) to fix the fixed rod (31) in an extended position; The fixed rod (31) comprises a radially sliding clamping block (41), and an elastic block (42) is provided inside the fixed rod (31) to push the clamping block (41) to slide radially out; the movable rod (32) is sleeved on the fixed rod (31), and the movable rod (32) is provided with a radial clamping groove (43); When the movable rod (32) and the fixed rod (31) are extended to a predetermined position relative to each other, the clamping block (41) slides into the clamping groove (43) to realize axial locking of the movable rod (32) and the fixed rod (31); The clamping blocks (41) are spirally distributed on the fixed rod (31), and the clamping grooves (43) are spirally arranged on the movable rod (32).

2. The vehicle connecting rod according to claim 1, characterized in that: The clamping block (41) is provided with a stopper (5), and the stopper (5) abuts against the inner wall of the fixed rod (31) to limit the clamping block (41) from slipping off the fixed rod (31).

3. The vehicle connecting rod according to claim 1, characterized in that: A slider (61) and a limiting groove (62) are provided between the rod (31) and the movable rod (32); the slider (61) slides in the limiting groove (62) to constrain the sliding tracks of the fixed rod (31) and the movable rod (32).

4. The vehicle connecting rod according to claim 1, characterized in that: The shaft (12) is provided with a single mark (7) pointing to the insertion hole (21).

5. A manufacturing process for the vehicle connecting rod according to claim 1, characterized in that: include, (1) Determine the size: Determine the forging size of the connecting rod; (2) Pretreatment of the blank: First, the decarburization layer and defects on the surface of the blank are removed by a grinder, then the blank is washed in tap water to remove dust, and then dried with a hot air blower. After drying, the surface of the blank is coated with a high temperature resistant and anti-oxidation anti-decarburization coating; (3) Heating: Heating the blank in a high temperature furnace with a furnace temperature of 800-900°C and a holding time of 40-50 minutes to soften the blank; (4) Hot press die forging: The die forging equipment is a 7500kN friction press. First, the oxide layer of the softened blank is removed, and then the blank is flattened on the upsetting table of the forging die. After that, the blank is placed flat in the groove for die forging to form a shape with a weight-reducing hole, and a slot is formed at the edge of the weight-reducing hole. (5) placing an insert ring in the slot, and placing a cover insert ring blank in the slot, and performing secondary die forging and pressing; After the secondary die forging and pressing, the excess edges are thermally cut off, and annealing is performed after trimming. The parts are placed in an electric furnace at 120-180℃ for annealing for 20 minutes. (6) Finishing: Use a grinding wheel cutter to cut the material, and then use a grinding wheel grinder for further finishing; measure and calibrate the dimensions of each part of the connecting rod. If the error is ≥1.0mm, continue to use the grinding wheel to cut and cut the material. If the error is <1.0mm, further finishing is performed; (7) Allow the connecting rod to cool and insert the reinforcing rod into the socket.

6. The manufacturing process of the vehicle connecting rod according to claim 5 is characterized by: In step (6), eddy current sorting is performed.

7. The manufacturing process of the vehicle connecting rod according to claim 6 is characterized by: After eddy current sorting, flaw detection is performed.

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