CN105172902A - Heavy-duty truck rear wheel fender bracket and processing method - Google Patents

Abstract

The invention relates to a heavy truck mudguard support, comprising: the support frame comprises a support frame seat and a support frame pipe, wherein the support frame pipe is connected with steps at one side of the support frame seat, the support frame seat is of a flange structure, and one side of the support frame seat is provided with a cylindrical step which takes the central line of the support frame seat as an axis and is connected with the support frame pipe; the stent tube is formed by processing an end tube wall through expanding and reaming, and the shape of the end part is as follows: the reducer pipe consists of a straight pipe connected with the cylindrical step of the bracket base and a section of flared pipe; the connecting structure of the bracket base and the bracket pipe is as follows: the two are in interference fit, and the joint is fully welded; compared with the prior art, the invention has the beneficial effects that: 1. the length of the welding line is increased, and the welding strength is improved. 2. The production and processing technology is simple, and the production cost is low; 3. the fatigue fracture phenomenon can not occur on the pipe wall.

Description

Heavy-duty truck rear wheel fender bracket and processing method

technical field

The invention relates to an automobile part, in particular to a fender bracket for a heavy-duty truck.

Background technique

At present, the patent number of a fender bracket commonly used in domestic heavy trucks is: ZL2012206494798, and the title is "a fender bracket for heavy vehicles". Its structure is composed of flange, special-shaped tube and plug needle. The flange is set on the outer wall of the end of the special-shaped tube. The shape is arc triangle, and the three are interference fit. The following problems exist in the production and use of this product: 1. Since the center hole of the flange, the end of the special-shaped pipe and the plug needle are in the shape of a circular arc triangle, the connection between the three is an interference tight fit, and the flange and special-shaped The processing accuracy and coaxiality of the tube and the plug needle are very high, so the production process is relatively complicated and the cost is high. 2. Since the fender is suspended on the straight section at the other end of the special-shaped pipe in the fender bracket, the distribution of stress points of the special-shaped pipe during use is that the closer it is to the flange, the greater the pull-off force and the greater the stress on the pipe wall. The larger the size; when the heavy-duty trucks operate under relatively harsh road conditions for a long time, the plug pins with an interference fit in the special-shaped pipe holes are prone to pull-off and tearing of the pipe wall.

Contents of the invention

The object of the present invention is to overcome the deficiencies in the above-mentioned technologies, and provide a heavy-duty automobile fender bracket with simple product structure and processing technology, low production cost and high fatigue life and a processing method thereof.

The technical solution adopted by the present invention is: a heavy-duty truck fender bracket, including: a bracket seat and a bracket tube, the bracket tube is connected with a step on one side of the bracket seat, the bracket seat is a flange structure, and one side is provided with There is a cylindrical step connected to the support pipe with the center line of the support seat as the axis; the top of the cylindrical step is provided with a convex part, which is a chamfered structure, and is used for the interference fit assembly of the support seat and the support pipe.

The bracket tube is processed by expansion, pressure and reaming of the tube wall at the end, and its end shape is: a straight tube connected with a cylindrical step of the bracket base and a variable diameter tube composed of a section of "trumpet" shaped tube. The inner diameter of the straight tube of the reducing tube is slightly smaller than the diameter of the cylindrical step of the support seat, and the two are interference fit.

The connection structure between the support seat and the support tube is: the cylindrical step is pressed into the straight tube hole of the support tube, the two are interference fit, and the joint is fully welded.

The heavy-duty truck fender support processing method of the present invention comprises the following steps:

1. Bracket tube processing

1. Cut the material, use the saw machine to cut the steel pipe to the required size of the pipe blank;

2. Chamfering, using an instrument lathe to chamfer the tube blank;

3. Pipe bending, using a pipe bending machine to bend the chamfered tube blank;

4. Expansion: use two sets of expansion forming molds to carry out two times of expansion, pressure and reaming on the round hole on one side of the elbow on the hydraulic press, so that the end of the elbow forms a deformed pipe.

Second, the bracket seat processing

Lathes are used to process the blanks.

3. Bracket assembly

1. Interference assembly, using a hydraulic press to press the cylindrical steps of the bracket seat into the bracket tube;

2. Welding, using fixtures to assemble and weld the bracket pipe and bracket seat;

3. Shot blasting, using a shot blasting machine to blast the bracket;

4. Plastic spraying, surface treatment of the bracket, plastic spraying and high temperature baking;

5. Packing and warehousing, marking, packaging, packaging, labeling, and warehousing of the brackets.

The beneficial effects of the present invention relative to the prior art are: 1. Compared with the original product structure, since the diameter of the pipe connected to the cylindrical step of the support seat increases more than the pipe diameter before the reaming, the length of the weld seam is increased and the the welding strength. 2. The step of the support seat is a cylinder, and the support tube is a round tube, while the inner hole of the flange, the wall of the special-shaped tube connection and the shape of the plug needle of the original product are circular arc triangles. Compared with the two, the production and processing process of the former is simple, and the latter The former is complicated, so that the former reduces the production cost; 3. Since the end of a section of the support tube near the support seat is a variable diameter tube, which is a "trumpet" shaped tube, the diameter of the original tube increases greatly compared with the original tube, so under the same working conditions , the pipe wall of the present invention will not appear fatigue fracture phenomenon.

Description of drawings

Fig. 1 is the structure schematic diagram of heavy-duty truck rear wheel fender bracket of the present invention.

Detailed ways

The present invention will be described in more detail with reference to accompanying drawing 1 below.

Fig. 1 is the heavy-duty truck rear wheel fender support of the present invention, comprises: support seat 1 and support pipe 2, support pipe 2 is connected with support seat side step 11, and described support seat 1 is a flange structure, one of which On the side, there is a cylindrical step 11 connected to the support tube 2 with the center line of the support seat 1 as the axis; the top of the cylindrical step 11 is provided with a convex part 12, which is a chamfered structure, and is used for the interference between the support seat 1 and the support tube 2. Fitted assembly.

The support pipe 2 is processed by expansion, pressure and reaming of the end pipe wall, and its end shape is: a straight pipe 211 connected with the cylindrical step 11 of the support base and a section of "trumpet" shaped pipe 212. The reduced diameter pipe 21 formed, the inner diameter of the straight pipe 211 of the reduced diameter pipe 21 is slightly smaller than the outer diameter of the cylindrical step 11 of the support seat, and the two are interference fit.

The connection method between the bracket seat 1 and the bracket tube 2 is as follows: the cylindrical step 11 is pressed into the hole 211 of the straight tube of the bracket tube, the two are interference fit, and the joint is fully welded.

The heavy-duty truck fender support processing method of the present invention comprises the following steps:

1. Bracket tube processing

1. For blanking, use a saw machine to cut and saw the required tube blank size for ordinary steel pipes;

2. Chamfering, using an instrument lathe to chamfer the tube blank;

3. Pipe bending, using a pipe bending machine to bend the chamfered tube blank;

4. Expansion: use two sets of expansion forming molds to carry out two times of expansion, pressure and reaming on the round hole on one side of the elbow on the hydraulic press, so that the end of the elbow forms a deformed pipe.

Second, the bracket seat processing

A lathe is used to process the blank of the bracket seat.

3. Bracket assembly

1. Interference assembly, using a hydraulic press to press the cylindrical steps of the bracket seat into the bracket tube;

2. Welding, using fixtures to assemble, weld and seal the bracket tube and bracket seat;

3. Shot blasting, using a shot blasting machine to blast the bracket;

4. Plastic spraying, surface treatment of the bracket, plastic spraying and high temperature baking;

5. Packing and warehousing, marking, packaging, packaging, labeling, and warehousing of the brackets.

The comparison test of the above two technical schemes

Usually, the diameter of the bracket tube of the car fender bracket is 30mm~50mm. Here, the diameter of the bracket tube of the heavy-duty vehicle is 50mm, and the wall thickness is 4mm as an example:

If the product produced according to the patent number is: ZL2012206494798, after testing, when the maximum pull-off force exceeds 150KN, the plug needle in the stent tube hole will be pulled off and the tube wall will be torn. According to the structure shown in Figure 1, the diameter of the thin end pipe wall of the rear wheel fender bracket is 50mm, the wall thickness is 4mm, the diameter of the thick end pipe wall is 75mm, and the wall thickness is 3.7mm. When the pull-off force exceeds 260KN, the problem of cracking will occur at the wall of the thin end tube.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above-mentioned descriptions, other Variation or change in different forms. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (4)

1. a heavy duty truck rear guard support, comprise: carrier base (1) and support tube (2), support tube (2) is connected with carrier base one Side step (11), it is characterized in that: described carrier base (1) is flange arrangement, one Side be provided with carrier base (1) line of centers be axis, the cylindrical step (11) that is connected with support tube 2, cylindrical step top is provided with protuberance (12);

Described support tube (2) is that its end shape is by a radicle tube wall after turgor pressure reaming is processed: be the adapter bonnet (21) that " loudspeaker " shape manages that (212) form by the straight tube (211) be connected with carrier base cylinder step (11) and one section;

Described carrier base (1) with the connection mode of support tube (2) is: cylinder step (11) is pressed in straight tube (21) hole of support tube, and the two is interference fit, its junction full weld.

2. a kind of heavy duty truck splash apron bracket according to claim 1, is characterized in that: described protuberance (12) is chamfering structure.

3. a kind of heavy duty truck splash apron bracket according to claim 1, is characterized in that: straight tube (211) internal diameter size of adapter bonnet (21) is slightly less than the outside dimension of carrier base cylinder step (11), and the two is interference fit.

4. a job operation for heavy duty truck splash apron bracket, is characterized in that comprising the following steps:

One, support tube processing,

(1), blanking, adopt saw to steel pipe cutting sawing needed for tube blank size;

(2), chamfering, adopt gauge lathe Dui Guan Pei to carry out chamfering;

(3), bend pipe, adopt pipe bending machine bend pipe is carried out to Guan Pei after chamfering;

(4), rise mouth, adopt second mate rise mouthful shaping die on a hydraulic press respectively to bend pipe one Side circular hole carry out secondary turgor pressure shaping reaming processing, make bend pipe end form a converting pipe portion;

Two, carrier base processing,

Lathe is adopted to process blank material;

Three, bracket assembled,

(1), elastic conjunction, adopt hydraulic compressor by carrier base cylinder step press-in support tube in;

(2), weld, use frock clamp to carry out assembly welding to support tube, carrier base, sealing;

(3), support, adopt shot-blasting machine ball blast is carried out to support;

(4), plastic-blasting, surface treatment is carried out to support, plastic-blasting, high-temperature baking;

(5), packaging warehouse-in, to support marking, packaging, pack, label, put process in storage.