Engine oil pan machining method

Abstract

The invention discloses an engine oil pan machining method which comprises the following steps: A) casting molding: casting with corresponding molten iron according to a corresponding manufacturing specification by matching with a corresponding mold prepared in advance, so that an oil pan body is cast and molded, and the manufacturing of the oil pan body is completed; a clamping seat used for clamping a nut is integrally formed on the inner side, provided with the oil discharge hole, of the oil pan body, the nut is clamped in a clamping groove of the clamping seat and cannot rotate, a boss is integrally formed on the outer side, provided with the oil discharge hole, of the oil pan body, and molten iron comprises, by weight, 3%-3.5% of C, 1%-2% of Si, 0.7%-0.9% of Mn, smaller than or equal to 0.3% of P and smaller than or equal to 0.2% of S; b) cleaning and decontaminating: correspondingly cleaning the inner wall and the outer surface of the oil pan body by using plasma water and ethanol in sequence in cooperation with a brush, so that the inner wall and the outer surface of the oil pan body are kept clean correspondingly, and the like. Compared with the prior art, the replacement cost can be reduced, and the problems of damage and oil leakage caused by collision are solved.

Description

Technical Field

[0001] The invention relates to the technical field of engine oil pan production, in particular to an engine oil pan processing method. Background Art

[0002] The oil pan is the lower part of the crankcase, also known as the lower crankcase. Its function is to seal the crankcase as the outer shell of the oil tank to prevent impurities from entering, collect and store the lubricating oil flowing back from the friction surfaces of the diesel engine, dissipate some heat, and prevent the lubricating oil from oxidizing.

[0003] The oil pan is mostly stamped from thin steel plates. Those with more complex shapes are generally cast from cast iron or aluminum alloy. An oil drain plug is also installed at the lowest point on the bottom of the oil pan. The oil in the oil pan can be drained and replaced through the drain plug. However, existing drain plugs are bound to have slipping threads, resulting in slippage, oil leakage, and loosening, necessitating the replacement of the entire oil pan, which increases replacement costs.

[0004] Also, because the oil pan is installed at a low position, it is inevitable that the oil pan will be bumped during daily use, which can easily cause deformation, damage, and oil leakage. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide a method for processing an engine oil pan, which can reduce replacement costs and reduce the problem of damage and oil leakage caused by bumps.

[0006] To achieve the above object, the present invention proposes a method for processing an engine oil pan, comprising the following steps: A) Casting: According to the corresponding manufacturing specifications, the corresponding molten iron is used to cast the oil pan body, and the oil pan body is manufactured. A holder for clamping a nut is integrally formed on the inner side of the oil pan body where the oil drain hole is provided, and the nut is clamped in the slot of the holder and cannot rotate. A boss is integrally formed on the outer side of the oil pan body where the oil drain hole is provided, and the chemical composition and weight percentage of the molten iron are: 3-3.5% C, 1-2% Si, 0.7-0.9% Mn, P≤0.3%, S≤0.2%; B) Cleaning and decontamination: Use plasma water and ethanol to clean the inner wall and outer surface of the oil pan body with a brush so that the inner wall and outer surface of the oil pan body are kept clean; C) Plane processing: The flange mounting surface of the oil pan body and the sealing surface of the boss are processed into planes and grooves through CNC processing; D) Drilling: The oil pan body is positioned and fixed by a processing fixture, and then the flange of the oil pan body and the corresponding position of the oil pan body are drilled by a drilling machine. The oil drain hole passes through the free end surface of the boss and the seat; E) Assembly seal inspection; F) Cleaning, drying and packaging.

[0007] Preferably, the chemical composition and weight percentage of the molten iron are: 3.3% C, 1.5% Si, 0.89% Mn, P≤0.3%, S≤0.2%.

[0008] Preferably, the molten iron smelting furnace is an external water-cooled three-row air outlet straight-cylinder cupola with a melting rate of 12 t / h, a 45% increase in carbon in the furnace, a 10% silicon burnout, and a 20% manganese burnout.

[0009] Preferably, the processing fixture includes a base, a frame, a plurality of supporting and fixing mechanisms and a plurality of template positioning mechanisms. The base is provided with a frame, and the frame is provided with a supporting and fixing mechanism and a template positioning mechanism. The template positioning mechanism is used for positioning and fixing the template. The supporting and fixing mechanism adjusts its position based on the template. After the position adjustment of the supporting and fixing mechanism is completed and meets the supporting and fixing position requirements of the corresponding oil pan, the base is driven to rotate by a rotating drive mechanism.

[0010] Preferably, the number of the template positioning mechanisms is four, and the four template positioning mechanisms are respectively arranged on four frame bodies of the frame, and the template positioning mechanism includes a support and a positioning pin arranged on the support.

[0011] Preferably, the template includes a reference body, a plurality of connecting ears, a plurality of positioning holes and a plurality of positioning grooves, the reference body matches the flange of the corresponding oil pan, the four edges of the reference body are provided with connecting ears, the connecting ears are provided with positioning holes, and the reference body is provided with positioning grooves on both sides of the connecting ears.

[0012] Preferably, the supporting and fixing mechanism comprises an adjusting mechanism, a supporting seat, a positioning stopper and a fixing and clamping mechanism, the adjusting mechanism is provided with a supporting seat, a positioning stopper is provided at one end of the supporting seat supporting the template, and a fixing and clamping mechanism is provided on the supporting seat.

[0013] Preferably, the lower end of the support seat is placed on the base.

[0014] Preferably, the adjustment mechanism comprises a sleeve I, a tightening screw I, a sleeve II, a tightening screw II and a connecting rod, the sleeve I is provided with a tightening screw I for fixedly connecting with the frame, the sleeve I is provided with a sleeve II, a connecting rod is provided in the sleeve II, and the sleeve II is provided with a tightening screw II for tightening and fixing the connecting rod.

[0015] Preferably, the fixed clamping mechanism includes a cylinder, a sliding sleeve, a sliding shaft, a hook and a tension spring. The sliding sleeve is provided with a sliding shaft, the driving end of the cylinder is fixedly connected to the lower end of the sliding shaft, the upper end of the sliding shaft is provided with a hinged hook, the two ends of the tension spring are respectively fixedly connected to the hook and the sliding shaft, the sliding sleeve is provided with a bracket, the bracket is provided with a support wheel, and the hook is pressed on the support wheel under the action of the tension spring.

[0016] Beneficial effects of the present invention: the present invention forms an integral seat for clamping a nut on the inner side of the oil pan body where the oil drain hole is opened, and the nut is clamped in the clamping groove of the seat and cannot rotate. When the nut is stripped, the nut can be replaced separately; the chemical composition and weight percentage of the molten iron are: 3~3.5% C, 1~2% Si, 0.7~0.9% Mn, P≤0.3%, S≤0.2%, the bending strength is greater than 400MPa, and the hardness is 200~250HBS. Compared with the prior art, the replacement cost can be reduced and the problem of damage and oil leakage caused by bumps can be reduced.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the processing fixture; Figure 2 It is a partial side view of the supporting and fixing mechanism.

[0019] In the figure: 1-base, 2-frame, 3-support and fixing mechanism, 4-template positioning mechanism, 5-template, 31-adjusting mechanism, 32-support seat, 33-positioning block body, 34-fixed pressing mechanism, 41-support, 42-positioning pin, 51-reference body, 52-connecting ear, 53-positioning hole, 54-positioning groove, 61-support frame, 62-rotating shaft, 63-worm gear reduction motor, 311-sleeve I, 312-tightening screw I, 313-sleeve II, 314-tightening screw II, 315-connecting rod, 341-cylinder, 342-sleeve, 343-sliding shaft, 344-hook, 345-tension spring, 346-bracket, 347-support wheel. DETAILED DESCRIPTION

[0020] The present invention provides a method for processing an engine oil pan, comprising the following steps: A) Casting: According to the corresponding manufacturing specifications, the corresponding molten iron is used to cast the oil pan body, and the oil pan body is manufactured. A holder for clamping a nut is integrally formed on the inner side of the oil pan body where the oil drain hole is provided, and the nut is clamped in the slot of the holder and cannot rotate. A boss is integrally formed on the outer side of the oil pan body where the oil drain hole is provided, and the chemical composition and weight percentage of the molten iron are: 3-3.5% C, 1-2% Si, 0.7-0.9% Mn, P≤0.3%, S≤0.2%; B) Cleaning and decontamination: Use plasma water and ethanol to clean the inner wall and outer surface of the oil pan body with a brush so that the inner wall and outer surface of the oil pan body are kept clean; C) Plane processing: The flange mounting surface of the oil pan body and the sealing surface of the boss are processed into planes and grooves through CNC processing; D) Drilling: The oil pan body is positioned and fixed by a processing fixture, and then the flange of the oil pan body and the corresponding position of the oil pan body are drilled by a drilling machine. The oil drain hole passes through the free end surface of the boss and the seat; E) Assembly seal inspection; F) Cleaning, drying and packaging.

[0021] The chemical composition and weight percentage of the molten iron are: 3.3% C, 1.5% Si, 0.89% Mn, P≤0.3%, S≤0.2%.

[0022] The molten iron smelting furnace used is an external water-cooled three-row air outlet straight-cylinder cupola with a melting rate of 12t / h, a carbon increase of 45%, a silicon burnout of 10%, and a manganese burnout of 20%.

[0023] See also Figure 1 , 2 The processing fixture includes a base 1, a frame 2, a plurality of supporting and fixing mechanisms 3 and a plurality of sample positioning mechanisms 4. The base 1 is provided with a frame 2, and the frame 2 is provided with a supporting and fixing mechanism 3 and a sample positioning mechanism 4. The sample positioning mechanism 4 is used for positioning and fixing the sample 5. The supporting and fixing mechanism 3 is position-adjusted based on the sample 5. After the position adjustment of the supporting and fixing mechanism 3 is completed and meets the supporting and fixing position requirements of the corresponding oil pan, the base 1 is driven to rotate by a rotating drive mechanism 6.

[0024] There are four sample positioning mechanisms 4 , which are respectively arranged on four frame bodies of the frame 2 . The sample positioning mechanisms 4 include a support 41 and a positioning pin 42 arranged on the support 41 .

[0025] The template 5 includes a reference body 51, a plurality of connecting ears 52, a plurality of positioning holes 53 and a plurality of positioning grooves 54. The reference body 51 matches the flange of the corresponding oil pan. The four edges of the reference body 51 are provided with connecting ears 52, the connecting ears 52 are provided with positioning holes 53, and the reference body 51 is provided with positioning grooves 54 on both sides of the connecting ears 52.

[0026] The supporting and fixing mechanism 3 includes an adjusting mechanism 31, a supporting seat 32, a positioning stopper 33 and a fixing and clamping mechanism 34. The adjusting mechanism 31 is provided with a supporting seat 32. A positioning stopper 33 is provided at one end of the supporting seat 32 supporting the template 5. The supporting seat 32 is provided with a fixing and clamping mechanism 34.

[0027] The lower end of the support seat 32 is placed on the base 1 .

[0028] The adjusting mechanism 31 comprises a sleeve I311, a tightening screw I312, a sleeve II313, a tightening screw II314 and a connecting rod 315. The sleeve I311 is provided with a tightening screw I312 for being fixedly connected to the frame 2. The sleeve I311 is provided with a sleeve II313. A connecting rod 315 is arranged inside the sleeve II313. The sleeve II313 is provided with a tightening screw II314 for tightening and fixing the connecting rod 315.

[0029] The fixed clamping mechanism 34 includes a cylinder 341, a sliding sleeve 342, a sliding shaft 343, a hook 344 and a tension spring 345. The sliding sleeve 342 is provided with a sliding shaft 343. The driving end of the cylinder 341 is fixedly connected to the lower end of the sliding shaft 343. The upper end of the sliding shaft 343 is provided with a hinged hook 344. The two ends of the tension spring 345 are respectively fixedly connected to the hook 344 and the sliding shaft 343. A bracket 346 is provided on the sliding sleeve 342. A support wheel 347 is provided on the bracket 346. The hook 344 is pressed on the support wheel 347 under the action of the tension spring 345.

[0030] The rotary drive mechanism 6 includes a support frame 61, on which two front and rear rotating shafts 62 are provided. The two rotating shafts 62 are respectively fixedly connected to the front and rear ends of the base 1. A worm gear reduction motor 63 is provided on the support frame 61, and the output end of the worm gear reduction motor 63 is fixedly connected to a rotating shaft 62.

[0031] During the operation of the processing fixture, the required sample 5 is selected and placed on the support 41, and the positioning pin 42 is ensured to be inserted into the corresponding positioning hole 53. Then the sliding sleeve I311 and the connecting rod 315 are used to adjust the position of the support seat 32 so that the positioning block 33 on the support seat 32 is stuck in the corresponding positioning groove 54. Then the tightening screw I312 and the tightening screw II314 are tightened. Then the sample 5 is removed, and then the oil pan is placed on the support seat 32. The oil pan is positioned and prevented from displacement by the positioning block 33. Then the cylinder 341 is started to pull the sliding shaft 343 downward, and the sliding shaft 343 pulls the hook 344 downward. Due to the blocking of the hook 344 by the support wheel 347, the hook 344 moves downward from a horizontal state to a vertical state. The hook 344 in the vertical state moves downward and hooks on the flange of the oil pan to press it tightly and fix it on the support seat 32.

[0032] The worm gear reduction motor 63 drives the corresponding rotating shaft 62 to rotate and drives the base 1 to rotate to adjust the angle.

[0033] By providing a supporting and fixing mechanism and a template positioning mechanism on the frame, the template positioning mechanism is used to position and fix the template, and the supporting and fixing mechanism adjusts its position based on the template. After the position adjustment of the supporting and fixing mechanism is completed, it meets the supporting and fixing position requirements of the corresponding oil pan, which can improve adaptability, is easy to use, has high positioning accuracy, and improves product quality.

[0034] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A method for processing an engine oil pan, characterized in that: The following steps are involved: A) Casting: According to the corresponding manufacturing specifications, the corresponding molten iron is used to cast the oil pan body, and the oil pan body is manufactured. A holder for clamping a nut is integrally formed on the inner side of the oil pan body where the oil drain hole is provided, and the nut is clamped in the slot of the holder and cannot rotate. A boss is integrally formed on the outer side of the oil pan body where the oil drain hole is provided, and the chemical composition and weight percentage of the molten iron are: 3-3.5% C, 1-2% Si, 0.7-0.9% Mn, P≤0.3%, S≤0.2%; B) Cleaning and decontamination: Use plasma water and ethanol to clean the inner wall and outer surface of the oil pan body with a brush so that the inner wall and outer surface of the oil pan body are kept clean; C) Plane processing: The flange mounting surface of the oil pan body and the sealing surface of the boss are processed into planes and grooves through CNC processing; D) Drilling: The oil pan body is positioned and fixed by a processing fixture, and then the flange of the oil pan body and the corresponding position of the oil pan body are drilled by a drilling machine. The oil drain hole passes through the free end surface of the boss and the seat; E) Assembly seal inspection; F) Cleaning, drying and packaging.

2. The engine oil pan processing method according to claim 1, characterized in that: The chemical composition and weight percentage of the molten iron are: 3.3% C, 1.5% Si, 0.89% Mn, P≤0.3%, S≤0.2%.

3. The method for machining an engine oil pan as claimed in claim 1, characterized in that: The molten iron smelting furnace used is an external water-cooled three-row air outlet straight-cylinder cupola with a melting rate of 12t / h, a carbon increase of 45%, a silicon burnout of 10%, and a manganese burnout of 20%.

4. The method for machining an engine oil pan as claimed in claim 1, characterized in that: The processing fixture comprises a base (1), a frame (2), a plurality of supporting and fixing mechanisms (3) and a plurality of sample positioning mechanisms (4); the base (1) is provided with a frame (2); the frame (2) is provided with a supporting and fixing mechanism (3) and a sample positioning mechanism (4); the sample positioning mechanism (4) is used for positioning and fixing a sample (5); the supporting and fixing mechanism (3) is used for adjusting the position of the sample (5) with reference to the sample (5); after the position adjustment of the supporting and fixing mechanism (3) is completed and the supporting and fixing position requirement of the corresponding oil pan is met, the base (1) is driven to rotate by a rotation driving mechanism (6).

5. The method for machining an engine oil pan as claimed in claim 4, characterized in that: The number of the template positioning mechanisms (4) is four, and the four template positioning mechanisms (4) are respectively arranged on four frame bodies of the frame (2). The template positioning mechanism (4) comprises a support (41) and a positioning pin (42) arranged on the support (41).

6. The method for machining an engine oil pan as claimed in claim 4, characterized in that: The template (5) comprises a reference body (51), a plurality of connecting ears (52), a plurality of positioning holes (53) and a plurality of positioning grooves (54); the reference body (51) matches the flange of the corresponding oil pan; the four edges of the reference body (51) are provided with connecting ears (52); the connecting ears (52) are provided with positioning holes (53); and the reference body (51) is provided with positioning grooves (54) on both sides of the connecting ears (52).

7. The method for machining an engine oil pan as claimed in claim 4, characterized in that: The supporting and fixing mechanism (3) comprises an adjusting mechanism (31), a supporting seat (32), a positioning stopper (33) and a fixing and clamping mechanism (34); the adjusting mechanism (31) is provided with a supporting seat (32); one end of the supporting seat (32) supporting the template (5) is provided with a positioning stopper (33); and the fixing and clamping mechanism (34) is provided on the supporting seat (32).

8. The method for machining an engine oil pan as claimed in claim 7, characterized in that: The lower end of the support seat (32) is placed on the base (1).

9. The method for machining an engine oil pan as claimed in claim 7, characterized in that: The adjustment mechanism (31) comprises a sleeve body I (311), a tightening screw I (312), a sleeve body II (313), a tightening screw II (314) and a connecting rod (315); the sleeve body I (311) is provided with a tightening screw I (312) for being fixedly connected to the frame (2); the sleeve body I (311) is provided with a sleeve body II (313); a connecting rod (315) is provided inside the sleeve body II (313); and the sleeve body II (313) is provided with a tightening screw II (314) for tightening and fixing the connecting rod (315).

10. The method for machining an engine oil pan as claimed in claim 7, characterized in that: The fixed pressing mechanism (34) comprises a cylinder (341), a sliding sleeve (342), a sliding shaft (343), a hook (344) and a tension spring (345); the sliding sleeve (342) is provided with a sliding shaft (343); the driving end of the cylinder (341) is fixedly connected to the lower end of the sliding shaft (343); the upper end of the sliding shaft (343) is provided with a hook (344) which is hingedly connected; the two ends of the tension spring (345) are respectively fixedly connected to the hook (344) and the sliding shaft (343); the sliding sleeve (342) is provided with a bracket (346); the bracket (346) is provided with a supporting wheel (347); the hook (344) is pressed on the supporting wheel (347) under the action of the tension spring (345).

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