Tool assembly for machining crankcase of air compressor

Abstract

The tool assembly comprises a base and a plurality of machining positions, each machining position comprises a limiting base, a front side pressing structure and a rear side pressing structure, each front side pressing structure comprises a front side oil hydraulic cylinder and a front side pressing head, and each rear side pressing structure comprises a rear side oil hydraulic cylinder and a rear side pressing head. A machining window is formed in the bottom of the limiting seat, a hollowed-out part is arranged on the base, the machining window corresponds to the hollowed-out part, the limiting seat is covered with the bottom of the crankcase in a buckled mode, the front side pressing head abuts against the edge of the front end of the crankcase in a pressed mode, the rear side pressing head abuts against the edge of the rear end of the crankcase in a pressed mode, the distance between every two adjacent machining positions is D, and the length of the base is L, the contact length of the front side pressure head and the crankcase is L1, the contact length of the front side pressure head and the crankcase is L2, the contact length of the rear side pressure head and the crankcase is L3, the contact length of the rear side pressure head and the crankcase is L4, and D is equal to a * L, L1 is equal to b * L2, and L3 is equal to c * L4. A plurality of machining positions are arranged, a plurality of crankcases can be machined, the replacing time of the crankcases is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a tooling for a machining center, and more particularly to a tooling assembly for machining an air compressor crankcase. Background Technology

[0002] In the prior art, after the crankcase of an air compressor is cast, it needs to be placed in a machining center for cylinder end face machining. For example, Chinese utility model patent CN202320492548.7, published on March 9, 2023, discloses a tooling for a small Bama crankcase of a piston compressor. This tooling includes a fixed platform, which includes a transition flange, a flange plate, and a positioning mandrel. The transition flange serves as the base of the tooling, the flange plate is bolted to the top of the transition flange, and the positioning mandrel is bolted to the top of the flange plate. The tooling also includes a clamping assembly located on one side of the positioning mandrel. The clamping assembly includes a pressure plate for clamping and a screw for fixing the pressure plate. The screw is fixedly connected to the middle of one side of the positioning mandrel, the pressure plate is inserted into the screw, and one end of the pressure plate abuts against the screw head, while the other end is close to the positioning mandrel. By adding a clamping component to the side center of the positioning mandrel, the concentricity of the motor stop and the intermediate bearing position can be ensured without the need for a vibrating cutter during machining. However, the aforementioned fixture can only machine one crankcase at a time, resulting in low efficiency and failing to meet the requirements for machining three sides of the crankcase. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a tooling assembly for machining air compressor crankcase with high processing efficiency and high processing accuracy.

[0004] A tooling assembly for machining an air compressor crankcase according to this utility model includes a base and multiple machining positions disposed on the base. Each machining position includes a limiting seat, a front clamping structure, and a rear clamping structure mounted on the base. The front clamping structure includes a front hydraulic cylinder and a front pressure head driven by the front hydraulic cylinder. The rear clamping structure includes a rear hydraulic cylinder and a rear pressure head driven by the rear hydraulic cylinder. The bottom of the limiting seat is formed with a machining window, and the base is provided with... The crankcase has a hollowed-out section, with the machining window corresponding to the hollowed-out section. The bottom cover of the crankcase is fastened to the limiting seat. The front pressure head presses against the front edge of the crankcase, and the rear pressure head presses against the rear edge of the crankcase. The distance between adjacent machining positions is D. The length of the base is L. The length of contact between the front pressure head and the crankcase is L1, and the length of contact between the front pressure head and the crankcase is L2. The length of contact between the rear pressure head and the crankcase is L3, and the length of contact between the rear pressure head and the crankcase is L4.

[0005] D = a * L, where a is a preset ratio value, and the value of a ranges from 0.10 to 0.20.

[0006] L1 = b * L2, where b is a preset ratio value, and the value of b ranges from 0.15 to 0.35.

[0007] L3 = c * L4, where c is a preset ratio value, and the value of c ranges from 0.08 to 0.15.

[0008] The tooling assembly for machining air compressor crankcases provided by this utility model also has the following auxiliary technical features:

[0009] Furthermore, the base has multiple locking slots on its front side, and the side wall of the crankcase is engaged in the locking slots.

[0010] Furthermore, the top of the limiting seat is provided with a plurality of limiting protrusions, which press against the side wall of the crankcase.

[0011] Further, the top of the limiting seat is provided with a limiting boss, and the bottom of the crankcase abuts against the limiting boss.

[0012] Furthermore, each of the machining positions includes two front clamping structures and one rear clamping structure, with the front clamping heads of the two front clamping structures pressing against the front two sides of the crankcase.

[0013] Further, two adjacent processing positions share a front clamping structure, and the two ends of the front clamping head in the front clamping structure press against the front edge of the two crankcases respectively.

[0014] Further, it includes lines W1 and W2 connecting the front hydraulic cylinder in the two front clamping structures and the rear hydraulic cylinder in the rear clamping structure, wherein the angle formed by the connecting lines W1 and W2 is 45 degrees to 50 degrees.

[0015] Furthermore, the length of the hollowed-out portion is H1, and the width of the base is H2.

[0016] H1 = d * H2, where d is a preset ratio value, and the value of d ranges from 0.40 to 0.50.

[0017] Further, the vertical distance between the front hydraulic cylinder and the rear hydraulic cylinder is H3, and the width of the base is H2. Then H3 = e * H2, where e is a preset proportional value, and the value of e ranges from 0.60 to 0.70.

[0018] Furthermore, the number of processing stations is 3-7.

[0019] The tooling assembly for machining air compressor crankcases provided by this utility model has the following advantages compared with the prior art: First, this utility model has multiple machining stations, which can machine multiple crankcases, reducing crankcase changeover time and improving work efficiency. Second, each machining station can machine the top, side, and bottom surfaces of the crankcase, and there is no need to re-clamp the crankcase during machining, ensuring the accuracy of each machined surface. Attached Figure Description

[0020] Figure 1 This is the front view of the present invention.

[0021] Figure 2 This is a rear view of the present invention.

[0022] Figure 3 This is a bottom view of the present invention.

[0023] Figure 4 This is the left view of the present invention.

[0024] Figure 5 This is a perspective view of the present invention.

[0025] Figure 6 This is an exploded perspective view of the tooling components and crankcase of this utility model.

[0026] Figure 7 This is an exploded perspective view of the present invention.

[0027] Figure 8 This is a perspective view of the limiting seat in this utility model. Detailed Implementation

[0028] To clearly illustrate the solutions in this utility model, preferred embodiments are given below in conjunction with the accompanying drawings for detailed description. The following description is merely exemplary and not intended to limit the application or use of this disclosure. It should be understood that throughout the drawings, corresponding reference numerals denote the same or corresponding parts and features.

[0029] like Figures 1 to 8As shown, this utility model provides a tooling assembly for machining an air compressor crankcase, including a base 1 and multiple machining positions 2 disposed on the base 1. Each machining position 2 includes a limiting seat 21 mounted on the base 1, a front clamping structure 22, and a rear clamping structure 23. The front clamping structure 22 includes a front hydraulic cylinder 221 and a front pressure head 222 driven by the front hydraulic cylinder 221. The rear clamping structure 23 includes a rear hydraulic cylinder 222. The crankcase 10 comprises a cylinder 231 and a rear pressure head 232 driven by the rear hydraulic cylinder 231. A machining window 211 is formed at the bottom of the limiting seat 21, and a hollow portion 11 is provided on the base 1. The machining window 211 corresponds to the hollow portion 11. The bottom of the crankcase 10 is covered by the limiting seat 21. The front pressure head 222 presses against the front edge of the crankcase 10, and the rear pressure head 232 presses against the rear edge of the crankcase 10. The crankcase 10 in this invention is used in an air compressor, primarily for mounting cylinders and crank transmission mechanisms. The crankcase 10 is L-shaped, therefore, the relevant structures on the top, bottom, and side surfaces of the crankcase need to be machined, while ensuring the parallelism and perpendicularity between these structures, requiring high precision. The front clamping structure 22 and rear clamping structure 23 of this invention contact the edge of the crankcase 10, exposing the machining surface and facilitating processing. Simultaneously, the crankcase 10 is secured to the limiting seat 21, which provides support and facilitates fixing the crankcase 10. To machine the bottom surface of the crankcase, a machining window 211 is provided on the limiting seat 21 and a hollow portion 11 is provided on the base 1, exposing the bottom machining area of ​​the crankcase for easier processing. Therefore, the machining position 2 of this invention can fix the crankcase 10, and all machining can be completed without re-clamping the crankcase during the entire process, effectively improving the accuracy between the three machining surfaces. This embodiment has five machining positions 2, which can clamp five crankcases 10 simultaneously, thus allowing for the processing of five crankcases at once, greatly improving production efficiency and reducing processing costs. Furthermore, this invention uses a hydraulic cylinder to drive the pressure head, enabling rapid crankcase replacement and improving stability.

[0030] In this embodiment, the distance between adjacent processing positions 2 is D, the length of the base 1 is L, the length of the front pressure head 222 in contact with the crankcase 10 is L1, the length of the front pressure head 222 is L2, the length of the rear pressure head 232 in contact with the crankcase 10 is L3, and the length of the rear pressure head 232 is L4.

[0031] D = a * L, where a is a preset ratio value, and the value of a ranges from 0.10 to 0.20. In this embodiment, a is 0.16.

[0032] L1 = b * L2, where b is a preset ratio value, and the value of b ranges from 0.15 to 0.35. In this embodiment, the front pressure head 222 has two structures. One is a middle front pressure head 222 located between two processing positions. The middle front pressure head 222 extends to both sides with two pressing parts, which can simultaneously press the workpieces of the two processing positions, that is, adjacent processing positions share one front pressure head. In the middle front pressure head, b is 0.25. The second type of front pressure head is a side front pressure head 222' located on both sides, and its b is 0.32.

[0033] L3 = c * L4, where c is a preset ratio value, and the value of c ranges from 0.08 to 0.15. In this embodiment, c is 0.10.

[0034] In this invention, the spacing D between the processing positions 2 is set according to the length of the base 1, which better accommodates the number of processing positions 2 and makes the layout of the processing positions 2 more reasonable. If the contact length between the front pressure head 222 and the crankcase to be processed is too short, the pressing and fixing force will be insufficient, and it is easy to loosen. If the contact length is too long, it will affect the processing of the crankcase. Therefore, this invention limits the contact length L1 to the above relationship, which not only facilitates processing but also ensures a firm fixation and prevents loosening. Similarly, if the contact length between the rear pressure head 232 and the crankcase to be processed is too short, the pressing and fixing force will be insufficient, and it is easy to loosen. If the contact length is too long, it will affect the processing of the crankcase. Therefore, this invention limits the contact length L3 to the above relationship, which not only facilitates processing but also ensures a firm fixation and prevents loosening. This invention adopts a three-point fixing method, which makes the crankcase 10 more stable, prevents displacement during processing, and improves processing accuracy.

[0035] See Figures 1 to 8 In the above embodiment of this utility model, a plurality of locking grooves 12 are provided on the front side of the base 1, and the side wall of the crankcase 10 is inserted into the locking grooves 12. The locking grooves 12 serve to fix the crankcase 10, so that the crankcase 10 will not shift, which is beneficial to processing and improves processing accuracy.

[0036] See Figures 1 to 8 In the above embodiment of this utility model, a plurality of limiting protrusions 24 are provided on the top of the limiting seat 21, and the limiting protrusions 24 press against the side wall of the crankcase 10. In this embodiment, there are two limiting protrusions 24, located on both sides of the limiting seat 21 respectively. The inner surface of the limiting protrusion 24 is consistent with the shape of the outer surface of the side wall of the crankcase, and can be tightly attached to the side wall of the crankcase 10 to play a limiting role, prevent the crankcase 10 from shifting, and improve the machining accuracy.

[0037] See Figures 1 to 8 In the above embodiment of this utility model, a limiting boss 25 is provided on the top of the limiting seat 21, and the bottom of the crankcase 10 abuts against the limiting boss 25. The shape of the limiting boss 25 is consistent with the bottom of the crankcase 10, and it can fit tightly against the bottom of the crankcase 10 to play a limiting role, prevent the crankcase 10 from shifting, and improve machining accuracy.

[0038] See Figures 1 to 8 In the above embodiments of this utility model, each processing station 2 further includes two front pressing structures 22 and one rear pressing structure 23. The front pressing heads 222 of the two front pressing structures 22 respectively press against the front two side edges of the crankcase 10. This utility model adopts a three-point pressing method, which makes the fixation more stable and less prone to falling off.

[0039] See Figures 1 to 8 In the above embodiment of this utility model, it is further included that two adjacent processing positions 2 share a front pressing structure 22, and the two ends of the front pressing head 222 in the front pressing structure 22 press against the front edge of the two crankcases 10 respectively. The two ends of the front pressing head 222 located between the two processing positions 2 extend to form two pressing parts, which can press against the crankcases 10 on the two processing positions 2 respectively, thus saving the number of front pressing structures 22.

[0040] See Figures 1 to 8 In the above embodiment of this utility model, the lines W1 and W2 connecting the front hydraulic cylinders 221 in the two front pressing structures 22 and the rear hydraulic cylinder 231 in the rear pressing structure 23 are further included, with the included angle θ formed by the connecting lines W1 and W2 being 45-50 degrees. In this embodiment, it is 48 degrees. The above three-point pressing positions are more reasonable, and at the same time, they facilitate the placement and removal of the crankcase 10, making processing easier.

[0041] See Figures 1 to 8 In the above embodiment of this utility model, the length of the hollow portion 11 is H1, and the width of the base 1 is H2.

[0042] H1 = d * H2, where d is a preset ratio value, and the value of d ranges from 0.40 to 0.50. In this embodiment, d is 0.46. In this utility model, if the hollow part 11 is too long, it will reduce the strength of the base 1; if it is too long, it will be difficult to process. The above relationship can better balance these two requirements and achieve the optimal result.

[0043] See Figures 1 to 8In the above embodiment of this utility model, the vertical distance between the front hydraulic cylinder 221 and the rear hydraulic cylinder 231 is H3, and the width of the base 1 is H2. Therefore, H3 = e * H2, where e is a preset proportional value, and the value of e ranges from 0.60 to 0.70. In this embodiment, e is 0.63. The distance between the front and rear hydraulic cylinders in this utility model is set using the above relationship, resulting in a more reasonable structure, facilitating the pressing against the crankcase 10, and also facilitating the placement and removal of the crankcase 10.

[0044] See Figures 1 to 8 In the above embodiments provided by this utility model, the number of processing positions 2 is further 3-7. This embodiment has 5 positions, which effectively improves processing efficiency.

[0045] In summary, the above description is merely an embodiment of this utility model and is only used to illustrate the principle of this utility model, not to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A tooling assembly for machining an air compressor crankcase, characterized in that, The system includes a base and multiple machining positions mounted on the base. Each machining position includes a limiting seat, a front clamping structure, and a rear clamping structure mounted on the base. The front clamping structure includes a front hydraulic cylinder and a front pressure head driven by the front hydraulic cylinder. The rear clamping structure includes a rear hydraulic cylinder and a rear pressure head driven by the rear hydraulic cylinder. The bottom of the limiting seat has a machining window, and the base has a hollow portion. The machining window corresponds to the hollow portion. The bottom of the crankcase is covered by the limiting seat. The front pressure head presses against the front edge of the crankcase, and the rear pressure head presses against the rear edge of the crankcase. The distance between adjacent machining positions is D. The length of the base is L. The length of the front pressure head in contact with the crankcase is L1, the length of the front pressure head is L2, the length of the rear pressure head in contact with the crankcase is L3, and the length of the rear pressure head is L4. D = a * L, where a is a preset ratio value, and the value of a ranges from 0.10 to 0.

20. L1 = b * L2, where b is a preset ratio value, and the value of b ranges from 0.15 to 0.

35. L3 = c * L4, where c is a preset ratio value, and the value of c ranges from 0.08 to 0.

15.

2. The tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The base has multiple slots on its front side, and the side wall of the crankcase is inserted into the slots.

3. The tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The top of the limiting seat is provided with multiple limiting protrusions, which press against the side wall of the crankcase.

4. The tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The top of the limiting seat is provided with a limiting boss, and the bottom of the crankcase abuts against the limiting boss.

5. A tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: Each of the machining positions includes two front clamping structures and one rear clamping structure, with the front clamping heads of the two front clamping structures pressing against the front two sides of the crankcase.

6. The tooling assembly for machining an air compressor crankcase as described in claim 5, characterized in that: Two adjacent processing positions share a front clamping structure, and the two ends of the front clamping head in the front clamping structure press against the front edge of the two crankcases respectively.

7. A tooling assembly for machining an air compressor crankcase as described in claim 5, characterized in that: The lines W1 and W2 connecting the front hydraulic cylinder in the two front clamping structures and the rear hydraulic cylinder in the rear clamping structure form an angle of 45-50 degrees.

8. The tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The length of the hollowed-out portion is H1, and the width of the base is H2. H1 = d * H2, where d is a preset ratio value, and the value of d ranges from 0.40 to 0.

50.

9. A tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The vertical distance between the front hydraulic cylinder and the rear hydraulic cylinder is H3, and the width of the base is H2. Then H3 = e * H2, where e is a preset proportional value, and the value of e ranges from 0.60 to 0.

70.

10. A tooling assembly for machining an air compressor crankcase as described in claim 1, characterized in that: The number of processing stations is 3-7.

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