阅读说明：本技术 一种液压系统粉末冶金高强度弹簧导座及其生产工艺 (Powder metallurgy high-strength spring guide seat of hydraulic system and production process thereof ) 是由 代超 于 2020-11-03 设计创作，主要内容包括：本发明是一种液压系统粉末冶金高强度弹簧导座及其生产工艺,该弹簧导座包括法兰,所述法兰的一端面上设有一对圆形凸台,用于固定弹簧的位置并限定两弹簧间的中心距,所述法兰的一端面上设有若干段C型台阶,用于支撑。本发明通过合理的选材以及工艺设计,在满足产品使用的性能要求的同时,可以保证良好的尺寸精度,避免进行额外的机械加工,后续的蒸汽处理工艺,可以保证产品良好的耐腐蚀性,同时具备良好的表面状态以及清洁度,避免对柱塞泵系统造成污染,并且产品的可设计性强、原材料利用率高、尺寸稳定且精度高、生产周期短,可大幅降低生产成本。(The invention relates to a high-strength spring guide seat for powder metallurgy of a hydraulic system and a production process thereof. Through reasonable material selection and process design, the invention can meet the performance requirements of product use, simultaneously can ensure good dimensional precision, avoid additional machining, ensure good corrosion resistance of the product through subsequent steam treatment process, simultaneously has good surface state and cleanliness, avoids pollution to a plunger pump system, has strong designability, high raw material utilization rate, stable size, high precision and short production period, and can greatly reduce production cost.)

1. The high-strength spring guide seat for the powder metallurgy of the hydraulic system is characterized by comprising a flange (24), wherein one end face of the flange (24) is provided with a pair of circular bosses (241) for fixing the positions of springs and limiting the center distance between the two springs, and one end face of the flange (24) is provided with a plurality of C-shaped steps (242) for supporting.

2. The hydraulic system powder metallurgy high-strength spring guide seat according to claim 1, wherein the flange (24) is provided with a forming groove (243) extending to the lower end to form an opening in the center, and the circular bosses (241) are symmetrically arranged on two sides of the forming groove (243).

3. The hydraulic system powder metallurgy high-strength spring guide seat according to claim 2, wherein the C-shaped step (242) is provided with three sections, one section is arranged above the forming groove (243), and the other two sections are positioned below the circular boss (241) and symmetrically arranged at two sides of the forming groove (243).

4. The hydraulic system powder metallurgy high strength spring guide according to claim 3, wherein the chamfer of the C-shaped step (242) in the outer diameter direction is 20 degrees.

5. The production process of the powder metallurgy high-strength spring guide seat of the hydraulic system is characterized by comprising the following steps of:

step 1), material selection: selecting a material to be FC-0208 powder material of MPIF standard according to the requirement of the service performance of the product;

step 2) processing a die: manufacturing and processing a corresponding forming die according to the blank size specification of the stator and by combining the size change rate of the powder in the process, wherein the forming die is processed through the processes of common machining, linear cutting, electric spark, polishing, grinding and inspection;

step 3), compression molding: according to the density and size requirements of the product, performing compression molding on the powder metallurgy molding press by using the selected powder;

step 4), sintering: sintering the formed blank of the product at 1120 ℃ for 30min, cooling the formed blank to room temperature in a furnace, and discharging the blank;

step 5) steam treatment: and (3) putting the sintered product into a steam treatment furnace, introducing steam at 550 ℃ and preserving heat for 2 hours, and then cooling the product to room temperature by air.

6. The production process of the hydraulic system powder metallurgy high-strength spring guide seat according to claim 5, wherein in the step 2) and the step 3), a forming die with an upper structure, a lower structure and a three-structure is adopted for compression forming.

7. The production process of the hydraulic system powder metallurgy high-strength spring guide seat according to claim 6, wherein the forming die comprises a middle die (1), a first forming lower punch (2), a second forming lower punch (3), a third forming lower punch (4-6), a first forming upper punch (7) and a second forming upper punch (8), one end of the first forming upper punch (7) abuts against one side end of the forming middle die (12), the other end of the first forming upper punch (7) is provided with a first forming upper punch pad (12), a first forming upper punch cover (21) is arranged on the outer peripheral surface of the first forming upper punch (7), the first forming upper punch cover (21) and the first forming upper punch pad (12) are fixedly connected through corresponding screws, one end of the second forming upper punch (8) abuts against the outer side end of the first forming upper punch pad (12), a second forming upper punch press cover (13) is arranged at the other end of the second forming upper punch (8), a second forming upper punch pad (16) is arranged at the outer side end of the second forming upper punch press cover (13), a female die press cover (23) is arranged on the outer peripheral surface of the middle die (1), a female die press pad (22) is arranged at the other side end of the forming middle die (12), a first forming lower punch (2) is arranged at the outer side end of the female die press pad (22), an extending part of the first forming lower punch (2) penetrates through the female die press pad (22) to be abutted into the middle die (1), a first forming lower punch press cover (19) is arranged on the outer peripheral surface of the first forming lower punch (2), a first forming lower punch pad (9) is arranged at the outer side end of the first forming upper punch (7), and the first forming lower punch press cover (19) and the first forming lower punch pad (9) are fixedly connected through corresponding screws, a third forming lower punch (4-6) is arranged on the outer side of the first forming lower punch pad (9), an extension part of the third forming lower punch (4-6) penetrates through the first forming lower punch pad (9) and the first forming lower punch (2) to be abutted into the middle die (1), a third forming lower punch cover (11) is arranged on the outer peripheral surface of the third forming lower punch (4-6), a third forming lower punch outer gland (20) is arranged on the outer peripheral surface of the third forming lower punch cover (11), a third forming lower punch pad (14) is arranged on the outer side of the third forming lower punch (4-6), the third forming lower punch outer gland (20) and the third forming lower punch pad (14) are fixedly connected through corresponding screws, a second forming lower punch (3) is connected to the outer side of the third forming lower punch pad (14), and a second forming lower punch cover (10) is arranged on the outer side of the second forming lower punch (3), the outside end of second shaping lower punch cover (10) is equipped with punching press pad (15) under the second shaping, the outside of punching press pad (15) is equipped with punching press connecting pad (17) under the third shaping, punching press connecting pad (14) under the third shaping are connected through bridging connecting rod (18) in third shaping lower punching press connecting pad (17).

Technical Field

The invention relates to the technical field of powder metallurgy, in particular to a high-strength spring guide seat for powder metallurgy of a hydraulic system and a production process thereof.

Background

The servo spring in the hydraulic system of the plunger pump needs a pair of spring guide seats for supporting, and the existing spring guide seats are generally obtained by casting or machining. But the size precision of the casting is poor, the requirement on the size can be met only by assisting certain mechanical processing in the later period, the process flow is complex, and the surface state of the workpiece is poor. Machining can ensure good dimensional accuracy, but machining efficiency is too low, raw material utilization rate is low, and cost is too high. In addition, considering the problem of processing cost, the shape and structure of the product are also limited to a certain extent, and the design requirement of light weight cannot be met.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a powder metallurgy high-strength spring guide seat of a hydraulic system and a production process thereof.

In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:

the utility model provides a hydraulic system powder metallurgy high strength spring guide, this spring guide includes the flange, be equipped with a pair of circular boss on the terminal surface of flange for the centre-to-centre spacing between two springs is injectd to the position of fixed spring, be equipped with a plurality of sections C type steps on the terminal surface of flange, be used for supporting.

Furthermore, the center of the flange is provided with a forming groove extending to the lower end to form an opening, and the circular bosses are symmetrically arranged on two sides of the forming groove.

Furthermore, the C-shaped step is provided with three sections, one section of the C-shaped step is arranged above the forming groove, and the other two sections of the C-shaped step are positioned below the circular boss and symmetrically arranged at two sides of the forming groove.

Further, the chamfer angle of the C-shaped step in the outer diameter direction is degree.

The production process of the powder metallurgy high-strength spring guide seat of the hydraulic system is characterized by comprising the following steps of:

step 1), material selection: selecting a material to be FC-0208 powder material of MPIF standard according to the requirement of the service performance of the product;

step 2) processing a die: manufacturing and processing a corresponding forming die according to the blank size specification of the stator and by combining the size change rate of the powder in the process, wherein the forming die is processed through the processes of common machining, linear cutting, electric spark, polishing, grinding and inspection;

step 3), compression molding: according to the density and size requirements of the product, performing compression molding on the powder metallurgy molding press by using the selected powder;

step 4), sintering: sintering the formed blank of the product at 1120 ℃ for 30min, cooling the formed blank to room temperature in a furnace, and discharging the blank;

step 5) steam treatment: and (3) putting the sintered product into a steam treatment furnace, introducing steam at 550 ℃ and preserving heat for 2 hours, and then cooling the product to room temperature by air.

Further, in the step 2) and the step 3), a forming die with an upper structure, a lower structure and a third structure is adopted for compression forming.

Further, the forming die comprises a middle die, a first forming lower punch, a second forming lower punch, a third forming lower punch, a first forming upper punch and a second forming upper punch, one end of the first forming upper punch is abutted to one side end of the forming middle die, the other end of the first forming upper punch is provided with a first forming upper punch pad, the peripheral surface of the first forming upper punch is provided with a first forming upper punch pressing cover, the first forming upper punch pressing cover is fixedly connected with the first forming upper punch pad through corresponding screws, one end of the second forming upper punch is abutted to the outer side end of the first forming upper punch pad, the other end of the second forming upper punch is provided with a second forming upper punch pressing cover, the outer side end of the second forming upper punch pressing cover is provided with a second forming upper punch pad, the peripheral surface of the middle die is provided with a female die pressing cover, and the other side end of the forming middle die is provided with a female die pressing pad, the outer side end of the female die press pad is provided with a first forming lower punch, an extension part of the first forming lower punch penetrates through the female die press pad and is abutted into the middle die, the outer peripheral surface of the first forming lower punch is provided with a first forming lower punch cover, the outer side end of the first forming upper punch is provided with a first forming lower punch pad, the first forming lower punch cover and the first forming lower punch pad are fixedly connected through corresponding screws, the outer side of the first forming lower punch pad is provided with a third forming lower punch-, the extension part of the third forming lower punch penetrates through the first forming lower punch pad and the first forming lower punch and is abutted into the middle die, the outer peripheral surface of the third forming lower punch-is provided with a third forming lower punch cover, the outer peripheral surface of the third forming lower punch cover is provided with a third forming outer punch cover, and the outer side end of the third forming lower punch-is provided with a third forming lower punch pad, the outer gland of punching press under the third shaping and punching press pad under the third shaping pass through corresponding screw looks rigid coupling, the outside end of punching press pad is connected with the punching press under the second shaping, the outside end that the punching press was pushed down under the second shaping is equipped with the punching press gland under the second shaping, the outside end of punching press gland is equipped with the punching press pad under the second shaping, the outside of punching press pad is equipped with the lower punching press connection pad of third shaping under the second shaping, punching press pad passes through the bridge member and connects punching press pad under the third shaping.

The invention has the beneficial effects that:

1. compared with the traditional process, the product design can be optimized, the light design target is realized, and the utilization rate of raw materials is improved;

2. the product is formed in one step, the size is stable, the precision is high, additional machining is not needed, and continuous and stable batch production can be realized;

3. a layer of compact oxide film is formed on the surface of the product through steam treatment, so that the surface state of the product is improved, and the wear resistance and the corrosion resistance of the surface of the product can be improved.

Drawings

FIG. 1 is a front view of a spring guide of the present invention;

FIG. 2 is a side view of the spring guide of the present invention;

FIG. 3 is a rear view of the spring guide of the present invention;

fig. 4 is a view showing the structure of the molding die of the present invention.

The reference numbers in the figures illustrate: 1. the die comprises a middle die, 2, a first forming lower punch, 3, a second forming lower punch, 4-6, a third forming lower punch, 7, a first forming upper punch, 8, a second forming upper punch, 9, a first forming lower punch pad, 10, a second forming lower punch cover, 11, a third forming lower punch cover, 12, a first forming upper punch pad, 13, a second forming upper punch cover, 14, a third forming lower punch pad, 15, a second forming lower punch pad, 16, a second forming upper punch pad, 17, a third forming lower punch pad, 18, a connecting pad, 19, a first forming lower punch cover, 20, a third forming lower punch outer cover, 21, a first forming upper punch cover, 22, a die press pad, 23, a die press cover, 24, a flange, 241, a circular boss, 242, a C-shaped step, a die press cover, 243 and a forming groove.

Detailed Description

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

Referring to fig. 1, the high strength spring guide for powder metallurgy of hydraulic system includes a flange 24, a pair of circular bosses 241 are provided on one end of the flange 24 for fixing the position of the spring and defining the center distance between the two springs, and a plurality of C-shaped steps 242 are provided on one end of the flange 24 for supporting.

The flange 24 is provided at the center thereof with a forming groove 243 extending to the lower end to form an opening, and the circular bosses 241 are symmetrically arranged at both sides of the forming groove 243.

The C-shaped step 242 has three sections, one section is disposed above the forming groove 243, and the other two sections are disposed below the circular boss 241 and symmetrically disposed at two sides of the forming groove 243.

The chamfer angle of the C-shaped step 242 in the outer diameter direction is 20 degrees.

The production process of the powder metallurgy high-strength spring guide seat of the hydraulic system is characterized by comprising the following steps of:

step 1), material selection: according to the requirements of the service performance of the product, particularly the performance requirements of strength and hardness, the material is selected to be FC-0208 powder material with MPIF standard, and the specific components are 0.18-0.22% of Cu, 0.8-1.0% of C, 0.7-0.9% of lubricant and the balance of iron powder;

step 2) processing a die: manufacturing and processing a corresponding forming die according to the blank size specification of the stator and by combining the size change rate of the powder in the process, wherein the forming die is processed through the processes of common machining, linear cutting, electric spark, polishing, grinding and inspection;

step 3), compression molding: according to the density and size requirements of the product, performing compression molding on the powder metallurgy molding press by using the selected powder;

step 4), sintering: sintering the formed blank of the product at 1120 ℃ for 30min, cooling the formed blank to room temperature in a furnace, and discharging the blank;

step 5) steam treatment: and (3) putting the sintered product into a steam treatment furnace, introducing steam at 550 ℃ for heat preservation for 2 hours, and then air-cooling to room temperature, wherein a layer of compact oxide film is formed on the surface of the product through the treatment, so that the surface state of the product is improved, and the wear resistance and the corrosion resistance of the surface of the product can be improved.

In the step 2) and the step 3), a forming die with an upper structure, a lower structure and a third structure is adopted for compression forming.

The forming die comprises a middle die 1, a first forming lower punch 2, a second forming lower punch 3, a third forming lower punch 4-6, a first forming upper punch 7 and a second forming upper punch 8, wherein one end of the first forming upper punch 7 is abutted to one side end of a forming middle die 12, the other end of the first forming upper punch 7 is provided with a first forming upper punch pad 12, the peripheral surface of the first forming upper punch 7 is provided with a first forming upper punch cover 21, the first forming upper punch cover 21 is fixedly connected with the first forming upper punch pad 12 through corresponding screws, one end of the second forming upper punch 8 is abutted to the outer side end of the first forming upper punch pad 12, the other end of the second forming upper punch 8 is provided with a second forming upper punch cover 13, the outer side end of the second forming upper punch cover 13 is provided with a second forming upper punch pad 16, the peripheral surface of the middle die 1 is provided with a female die cover 23, the other side end of the middle forming die 12 is provided with a female die press pad 22, the outer side end of the female die press pad 22 is provided with a first lower forming punch 2, the extension part of the first lower forming punch 2 penetrates through the female die press pad 22 to be abutted into the middle die 1, the outer peripheral surface of the first lower forming punch 2 is provided with a first lower forming punch cover 19, the outer side end of the first upper forming punch 7 is provided with a first lower forming punch pad 9, the first lower forming punch cover 19 and the first lower forming punch pad 9 are fixedly connected through corresponding screws, the outer side of the first lower forming punch pad 9 is provided with third lower forming punches 4-6, the extension parts of the third lower forming punches 4-6 penetrate through the first lower forming punch pad 9 and the first lower forming punch 2 to be abutted into the middle die 1, the outer peripheral surfaces of the third lower forming punches 4-6 are provided with third lower forming punch covers 11, the outer peripheral surface of the third forming lower punch cover 11 is provided with a third forming lower punch outer cover 20, the outer side end of the third forming lower punch 4-6 is provided with a third forming lower punch pad 14, the third forming lower punch outer cover 20 and the third forming lower punch pad 14 are fixedly connected through corresponding screws, the outer side end of the third forming lower punch pad 14 is connected with a second forming lower punch 3, the outer side end of the second forming lower punch 3 is provided with a second forming lower punch cover 10, the outer side end of the second forming lower punch cover 10 is provided with a second forming lower punch pad 15, the outer side of the second forming lower punch pad 15 is provided with a third forming lower punch connecting pad 17, and the third forming lower punch connecting pad 17 is connected with the third forming lower punch pad 14 through a bridging rod 18.

In addition, it should be noted that the terms "first", "second", "third", and the like in the specification are used for distinguishing various components, elements, steps, and the like in the specification, and are not used for indicating a logical relationship or a sequential relationship between the various components, elements, steps, and the like, unless otherwise specified or indicated.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.