阅读说明：本技术 一种汽车用卡簧成型工艺 (Forming process of clamp spring for automobile ) 是由 吴品 金新志 于 2021-06-15 设计创作，主要内容包括：一种汽车用卡簧成型工艺,通过在传统C型卡簧的开口处设置连接筋,得到O型卡簧,在热处理、研磨等工艺完毕后,最终冲去连接筋,得到完整的C型卡簧。由于热处理时是O型卡簧,因此热处理的过程中不会出现开口大比例的变形,有效提高了C型卡簧在热处理时的良品率。避免了存在卡口导致的变形问题,由于在滚筒研磨锐边时是O型卡簧,因此不会出现零件之间够绑在一起导致零件之间的划伤,有效提高了需要将C型卡簧锐边磨圆的产能。在零件外表面处理完毕后,再冲去连接筋,得到成品C型零件。(A connecting rib is arranged at an opening of a traditional C-shaped clamp spring to obtain an O-shaped clamp spring, and after the processes of heat treatment, grinding and the like are finished, the connecting rib is finally punched out to obtain the complete C-shaped clamp spring. Because the O-shaped clamp spring is used in the heat treatment process, the deformation with large opening proportion can not occur in the heat treatment process, and the yield of the C-shaped clamp spring in the heat treatment process is effectively improved. The deformation problem that has the bayonet socket to lead to has been avoided, because be O type jump ring when sharp limit is ground to the cylinder, consequently can not appear tying up the fish tail that leads to between the part together between the part, effectively improved the productivity that needs sharp limit rounding of C type jump ring. And after the outer surface of the part is processed, the connecting ribs are punched to obtain the finished product C-shaped part.)

1. The forming process of the clamp spring for the automobile is characterized by comprising the following steps: the forming process comprises the following steps of 1, stamping, namely putting raw materials into a first pair of stamping dies, and stamping to obtain an O-shaped clamp spring piece, wherein the O-shaped clamp spring structure comprises a C-shaped basic clamp spring and a connecting rib connected with a bayonet of the C-shaped basic clamp spring;

step 2, placing the O-shaped clamp spring piece into quenching equipment for heat treatment;

step 3, placing the O-shaped clamp spring piece into roller grinding equipment, and performing sharp edge rounding treatment;

and 4, placing the ground O-shaped clamp spring piece into a second auxiliary stamping die, and correspondingly punching out a connecting rib connected with the C-shaped basic clamp spring bayonet to obtain a C-shaped clamp spring finished product part.

2. The forming process of the clamp spring for the automobile according to claim 1, wherein the forming process comprises the following steps: the clamp spring is made of 65Mn raw materials, and the thickness of the clamp spring is 1.0 MM.

3. The forming process of the clamp spring for the automobile according to claim 1, wherein the forming process comprises the following steps: the heat treatment comprises heating, salt bath quenching and cooling through a mesh belt furnace, tempering at 360 +/-10 ℃ through a tempering furnace for 150 +/-5 minutes, and the hardness reaches HRC 44-51.

4. The forming process of the clamp spring for the automobile according to claim 1, wherein the forming process comprises the following steps: in the step 1, a 16T punch is adopted for punching the O-shaped clamp spring; in the step 4, a 6.3T punch press is adopted for punching the C-shaped clamp spring.

5. The forming process of the clamp spring for the automobile according to claim 1, wherein the forming process comprises the following steps: in the step 3, the grinding equipment is a single-chain centrifugal four-roller, and the rolling time is 135 +/-5 minutes; the abrasive is yellow sand; the loading capacity of the yellow sand is 2.4 plus or minus 0.1L; water (1.5. + -. 0.1L) was added.

Technical Field

The invention relates to the technical field of automobile part manufacturing, in particular to a process for forming a clamp spring for an automobile.

Background

Circlips (foreign language name circlips), also called retainer rings or snap rings, belong to one type of fasteners, are arranged in shaft grooves or hole grooves of machines and equipment and play a role in preventing parts on shafts or holes from moving axially.

The production process of the traditional snap spring is that the traditional forming process flow of the snap spring is 1 punching and blanking into a C shape, 2 a mesh belt furnace isothermal quenching heat treatment and 3 a roller grinding sharp edge (the snap spring with the required sharp edge rounding).

The traditional process has the problems that: 1. due to the fact that the clamp spring has large deformation after heat treatment in the C-shaped opening, the size precision of the product is seriously affected. 2. Because the existence of C type opening, when the jump ring ground sharp edge in the cylinder, can make the part hook each other and tie up because the opening, produce the fish tail between the part, lead to the load capacity of every bucket the inside just can avoid scratching between the part less. Therefore, the conventional process needs a step of binding and fixing the parts in the process so as to avoid mutual binding.

Disclosure of Invention

The invention provides a process tool for forming a clamp spring for an automobile, aiming at solving the technical defects.

The technical scheme of the invention is as follows: a forming process of a clamp spring for an automobile comprises the following steps of step 1, stamping, namely putting raw materials into a first pair of stamping dies, and stamping to obtain an O-shaped clamp spring piece, wherein the O-shaped clamp spring structure comprises a C-shaped basic clamp spring and a connecting rib connected with a bayonet of the C-shaped basic clamp spring;

step 2, placing the O-shaped clamp spring piece into quenching equipment for heat treatment;

step 3, placing the O-shaped clamp spring piece into roller grinding equipment, and performing sharp edge rounding treatment;

and 4, placing the ground O-shaped clamp spring piece into a second auxiliary stamping die, and correspondingly punching out a connecting rib connected with the C-shaped basic clamp spring bayonet to obtain a C-shaped clamp spring finished product part.

The invention further comprises the following steps: the clamp spring is made of 65Mn raw materials, and the thickness of the clamp spring is 1.0 MM.

The invention further comprises the following steps: the heat treatment comprises heating, salt bath quenching and cooling through a mesh belt furnace, tempering at 360 +/-10 ℃ through a tempering furnace for 150 +/-5 minutes, and the hardness reaches HRC 44-51.

The invention further comprises the following steps: in the step 1, a 16T punch is adopted for punching the O-shaped clamp spring; and 4, punching the C-shaped clamp spring by using a 6.3T punch.

The invention further comprises the following steps: in the step 3, the grinding equipment is a single-chain centrifugal four-roller, and the rolling time is 135 +/-5 minutes; the abrasive is yellow sand; the loading capacity of the yellow sand is 2.4 plus or minus 0.1L; water (1.5. + -. 0.1L) was added.

The invention has the beneficial effects that: 1, because the O-shaped clamp spring is used in the heat treatment process, the deformation of a large proportion of the opening can not occur in the heat treatment process, and the yield of the C-shaped clamp spring in the heat treatment process is effectively improved. Avoided having avoided the deformation problem 2 that has the bayonet socket to lead to, owing to be O type jump ring when cylinder grinding sharp edge, consequently can not appear tying up the fish tail between the part that leads to together between the part, effectively improved the productivity that needs grind the circle with C type jump ring sharp edge. And after the outer surface of the part is processed, the connecting ribs are punched to obtain the finished product C-shaped part.

As shown in the table below, by comparison of actual production data of an applicant, the improved process and the arrangement of the connecting ribs can obviously avoid the deformation of the opening of the C-shaped clamp spring, so that the qualification rate of finished parts is obviously improved. And the grinding loading quantity is greatly increased every time, and the production treatment efficiency is improved.

Drawings

FIG. 1 is a flow chart of a conventional process;

FIG. 2 is a process flow diagram of an embodiment of the invention;

wherein, 1-punching, 2-bundling, 3-heat treatment, 4-grinding, 5-punching off the connecting rib, 6, connecting rib, 7-C type snap spring finished product parts.

Detailed Description

As shown in fig. 1-2, the molding process of the automotive snap spring comprises the following steps of 1, stamping 1, putting raw materials into a first pair of stamping dies, and stamping to obtain an O-shaped snap spring piece, wherein the O-shaped snap spring structure comprises a C-shaped basic snap spring and a connecting rib connected with a bayonet of the C-shaped basic snap spring;

step 2, placing the O-shaped clamp spring piece into quenching equipment for heat treatment 3;

step 3, placing the O-shaped clamp spring piece into roller grinding equipment, and performing sharp edge rounding treatment;

and 4, placing the ground O-shaped clamp spring piece into a second auxiliary stamping die, and correspondingly punching out a connecting rib 6 connected with the C-shaped basic clamp spring bayonet to obtain a C-shaped clamp spring finished product part 7.

The clamp spring is made of 65Mn raw materials, and the thickness of the clamp spring is 1.0 MM.

The heat treatment comprises heating, salt bath quenching and cooling through a mesh belt furnace, tempering at 360 +/-10 ℃ through a tempering furnace for 150 +/-5 minutes, and the hardness reaches HRC 44-51.

In the step 1, a 16T punch is adopted for punching the O-shaped clamp spring; in the step 4, a 6.3T punching machine is adopted for punching the C-shaped clamp spring.

In the step 3, the grinding equipment is a single-chain centrifugal four-roller, and the rolling time is 135 +/-5 minutes; the abrasive is yellow sand; the loading capacity of the yellow sand is 2.4 plus or minus 0.1L; water (1.5. + -. 0.1L) was added.

The invention has the beneficial effects that: 1, because the O-shaped clamp spring (shown on the left side in the attached drawing 2 of the specification) is used in the heat treatment process, the deformation with a large opening ratio cannot occur in the heat treatment process, and the yield of the C-shaped clamp spring in the heat treatment process is effectively improved. Avoided having avoided the deformation problem 2 that has the bayonet socket to lead to, owing to be O type jump ring when cylinder grinding sharp edge, consequently can not appear tying up the fish tail that leads to between the part together between the part, effectively improved the productivity that needs round with the sharp limit rounding of C type jump ring. And after the outer surface of the part is processed, the connecting ribs are punched to obtain the finished product C-shaped part.