Machining method of guide arm two-leaf spring

Abstract

The invention belongs to the technical field of production methods of guide arms, and particularly relates to a machining method for a two-leaf spring of a guide arm. Comprising the following steps: (1) rolling: rolling cut raw materials into blanks; (2) lug rolling, wherein the blank is subjected to edge cutting and lug rolling; (3) thermal forming is conducted, specifically, the workpiece obtained after lug rolling is put into a quenching heating furnace to be heated, and then twisting and forming are conducted through a twisting machine and a forming machine; (4) punching air bag holes: quickly feeding the workpieces into a punching machine to punch the air bag holes, and then sequentially feeding the workpieces into a uniform-temperature furnace; (5) quenching: continuously carrying out quenching, tempering and shot blasting treatment on the workpiece; and (6) forming a center hole: machining the center hole of the workpiece through a drilling machine. The multiple air bag holes of the two leaf springs are formed at a time through the stamping technology, so that the machining efficiency is improved, the cost is reduced, and the automation degree is high.

Description

Technical Field

[0001] The invention belongs to the technical field of production methods of guide arms, and in particular relates to a processing method of two leaf springs of a guide arm. Background Art

[0002] The guide arm in vehicles such as automobiles mainly plays the role of shock absorption, guidance, bearing and transmission. The guide arm includes a leaf spring and a two-leaf spring, wherein the two-leaf spring is provided with a center hole and an airbag hole and has a bend. The number of airbag holes ranges from 1 to 3. The two-leaf spring is relatively thick, and a drilling machine is usually used to drill holes one by one. At present, the production and processing method of the two-leaf spring is to cut the raw material, roll it, curl it, twist it after hot forming, form it, quench it, and then use a drilling machine to process the airbag hole and the center hole. This method is inefficient. Taking a two-leaf spring with three airbag holes as an example, four holes need to be drilled, and each hole takes 15 seconds, and a total of 60 seconds is required to complete the processing of all holes; the strength of the two-leaf spring is relatively high, and the consumption of consumables such as drill bits during drilling is large, and the cost is high. Summary of the invention

[0003] The purpose of the present invention is to provide a method for processing two leaf springs of a guide arm to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A method for processing a guide arm two-leaf spring comprises the following steps:

[0006] (1) Rolling: rolling the cut raw materials into billets;

[0007] (2) Ear curling: trimming and ear curling the blank;

[0008] (3) Hot forming: The workpiece after ear curling is placed in a quenching heating furnace for heating, and then twisted and formed by a twisting machine and a forming machine;

[0009] (4) Punching airbag holes: The workpiece is quickly sent to the punching machine to punch the airbag holes and then sent to the temperature-averaging furnace in turn;

[0010] (5) Quenching: Continue to quench, temper and shot peen the workpiece;

[0011] (6) Center hole drilling: The center hole of the workpiece is machined by a drilling machine.

[0012] Furthermore, the heating temperature for thermoforming in step (3) is 950°C.

[0013] Furthermore, when punching the airbag holes in step (4), the residual heat of the workpiece is maintained above 800°C, the workpiece is placed in a punching machine by a six-axis robot, and a corresponding number of punches are installed at the punching end of the punching machine as needed to punch out all the airbag holes at one time. The workpiece is then sent to a temperature-averaging furnace by the six-axis robot and evenly heated to 800°C.

[0014] Furthermore, the quenching time in step (5) is calculated according to the empirical quenching formula, and the tempering temperature is 480°C.

[0015] Furthermore, the quenching empirical formula is:

[0016] T = h × 5;

[0017] Where: T is the quenching time, unit is s;

[0018] h is the workpiece thickness in mm.

[0019] The present invention has the following beneficial effects:

[0020] 1. The present invention uses a stamping process to form multiple airbag holes of two leaf springs at one time, thereby improving processing efficiency.

[0021] 2. The six-axis robot can flexibly and quickly transfer the workpiece, so that the residual heat of the workpiece is kept above 800℃, thereby preventing the heat of the workpiece from being lost too quickly, and the degree of automation is high.

[0022] 3. The drilling machine only needs to process one center hole for each workpiece, thus reducing the cost of drilling.

[0023] 4. Compared with the drilling method, punching is more efficient. The workpiece can be positioned and punched within 20 seconds. Especially when there are 2 or 3 holes, they can be punched at one time, which greatly improves the production efficiency. One punching machine can work with multiple twisting machines and forming machines to increase production. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] A method for processing a guide arm two-leaf spring comprises the following steps:

[0026] (1) Rolling: Rolling the cut raw materials into billets according to the designed dimensions of the product;

[0027] (2) Ear curling: trim the edges and curl the ears of the blank.

[0028] (3) Hot forming: The workpiece after ear curling is placed in a quenching heating furnace and heated to 950°C, and then twisted and formed by a twisting machine and a forming machine.

[0029] (4) Punching airbag holes: The workpiece is quickly sent into the punching machine to punch the airbag holes and then sent to the temperature equalizing furnace in turn.

[0030] When punching the airbag holes, keep the residual heat of the workpiece above 800°C. Place the workpiece into the punching machine via a six-axis robot. This embodiment requires processing three airbag holes. Install three punches at the punching end of the punching machine to punch out all the airbag holes at one time. Then, send the workpiece to a temperature-averaging furnace via a six-axis robot and heat it evenly to 800°C.

[0031] The temperature of the workpiece becomes uneven after twisting, forming and stamping. Heating in a temperature-averaging furnace can make the temperature distribution of the workpiece uniform, which is beneficial to improving the physical properties of the workpiece after quenching.

[0032] (5) Quenching: The thickness of the two leaf springs in this embodiment is 20 mm. The workpiece is quenched for 100 seconds, tempered at 480° C., and then shot peened using a shot peening machine.

[0033] (6) Center hole drilling: The center hole of the workpiece is machined by a drilling machine. The drilling machine only needs to machine one center hole for each workpiece, thus reducing the cost of drilling.

[0034] The working principle of the present invention is:

[0035] Compared with the center hole, the airbag hole of the two-leaf spring has lower precision requirements and is mainly used to install the buffer airbag, so it does not require a high-precision drilling machine to make holes. The residual heat of the workpiece after twisting and forming is above 800℃. Under this working condition, it is easier to punch holes. Therefore, the workpiece must be moved, positioned, and punched quickly. The six-axis robot can flexibly and quickly adjust the workpiece posture, and cooperate with the positioning components on the punching machine to complete the workpiece in place in a shorter time, thereby preventing the workpiece from losing heat too quickly, and the degree of automation is high. Compared with the drilling method, the punching method is more efficient, and the workpiece can be positioned and drilled within 20 seconds, which greatly improves production efficiency. One punching machine can work with multiple twisting machines and forming machines. The subsequent drilling machine only needs to process one center hole for each workpiece, thereby reducing the cost of drilling.

[0036] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should all fall within the scope of protection of the present invention.

[0037] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for processing a two-leaf spring of a guide arm, characterized in that: The following steps are involved: (1) Rolling: rolling the cut raw materials into billets; (2) Ear curling: trimming and ear curling the blank; (3) Hot forming: The workpiece after ear curling is placed in a quenching heating furnace for heating, and then twisted and formed by a twisting machine and a forming machine; (4) Punching airbag holes: The workpiece is quickly sent to the punching machine to punch the airbag holes and then sent to the temperature-averaging furnace in turn; (5) Quenching: Continue to quench, temper and shot peen the workpiece; (6) Center hole drilling: The center hole of the workpiece is machined by a drilling machine.

2. The method for processing the two-leaf spring of the guide arm according to claim 1, characterized in that: The heating temperature of the thermoforming in step (3) is 950°C.

3. The method for processing the two-leaf spring of the guide arm according to claim 1, characterized in that: When punching the airbag holes in step (4), the residual heat of the workpiece is kept above 800°C. The workpiece is placed on a punching machine by a six-axis robot. A corresponding number of punches are installed at the punching end of the punching machine as needed to punch out all the airbag holes at one time. The workpiece is then sent to a temperature-averaging furnace by the six-axis robot and evenly heated to 800°C.

4. The method for processing the two leaf springs of the guide arm according to claim 1, characterized in that: The quenching time in step (5) is calculated according to the quenching empirical formula, and the tempering temperature is 480°C.

5. The method for processing the two leaf springs of the guide arm according to claim 4, characterized in that: The quenching empirical formula is: T = h × 5; Where: T is the quenching time, unit is s; h is the workpiece thickness in mm.