Processing and manufacturing method for high precision sand casting mold

A technology of sand casting and manufacturing methods, which is applied in the field of processing and manufacturing high-precision sand casting moulds, which can solve the problems of small feed amount, long processing time, and long tool path, so as to reduce manufacturing costs, save processing time, and reduce labor. intensity effect

Inactive Publication Date: 2018-07-13
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, foreign automobile manufacturers have high requirements for some automotive castings: casting cast iron flaw detection ASTME446Ⅲ level, casting tolerance ISO8062-CT-9, the physical shape of the casting should be compared with the 3D scanning, and the tolerance inspection of 0.3mm should be carried out according to the contour benchmark. Some casting shapes Complicated, the minimum fillet reaches R2mm, and the automobile manufacturers also have a relatively urgent requirement on the time to get the samples. Usually, it only takes about 15 days for the factory to receive the task and deliver the samples. requirements
[0003] Now the processing of the mold has developed to the programmed NC (Numerical Control) CNC machining. The CNC machine tool controls the tool to profiling along the machined surface according to the NC machining program designed by the CAM (Computer Aided Manufacturing) software. The traditional processing method is Roughing, secondary roughing, and finishing complete the processing of the three-dimensional surface of the mold. This method is consistent with the NC machining method, cutting direction, and tool parameters of the entire surface, especially when post-processing includes small rounded corners. In the profile area, the tool with a small diameter will also move the entire processing area according to the program. Because the tool diameter is small, the amount of feed is also small, and the tool path is long, resulting in too long processing time.
The time left for other processes is very short, and in severe cases, the delivery of samples will be delayed. Therefore, the problem of saving time in the processing of sand casting molds needs to be solved urgently
[0004] The Chinese patent announcement number is CN104827111B, and the disclosure date is August 4, 2017. The name of the invention is a mold surface processing method. The patent discloses a mold surface processing method, which divides the mold surface processing into plane areas and In the slope area, the processing strategies of the two areas are different, so that the processing methods of each area can achieve the maximum optimization of manufacturability, processing efficiency and processing quality, and the vibration of the tool and machine tool is small, although the prior art avoids the shape processing of the entire mold surface One-size-fits-all approach, but still one-size-fits-all for flat or beveled areas, limited time savings
Because casting products generally cannot directly cast products with high surface gloss, this processing method is not suitable for processing casting molds

Method used

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  • Processing and manufacturing method for high precision sand casting mold
  • Processing and manufacturing method for high precision sand casting mold

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Example 1: RuT300 cast iron has good plasticity and toughness, high thermal conductivity, small thermal stress concentration, good resistance to oxidation and growth at high temperatures, and is applied to parts and tools that withstand impact loads and thermal fatigue. Use RuT300 cast iron as the object to process a sand casting mold with a set of 2 pieces. The outer mold has a round corner area of ​​R2.1mm, and it is processed with a general-purpose machining center.

[0026] Processing steps such as figure 1 As shown, the specific steps are as follows:

[0027] Step (1): After fixing a piece of RuT300 cast iron blank used for processing the outer mold on the machine table, use a φ35 bull nose knife to quickly roughen the outer mold surface.

[0028] Step (2) Change the tool with a φ16 bullnose knife for secondary roughening of the outer model surface.

[0029] Step (3): Change the tool to a φ10 ball-end cutter for finishing on the outer model surface.

[0030] Ste...

Embodiment 2

[0034] Embodiment 2: use RuT300 cast iron as the object to process a sand casting mold core box 2 sets of 2 pieces, the core box has a rounded corner area of ​​R2.1mm, and process it with a general-purpose machining center machine tool.

[0035] Specific steps are as follows:

[0036] Step (1): After fixing a piece of RuT300 cast iron blank used for processing the core box on the machine table, first use a φ25 bullnose knife core box profile to quickly rough it.

[0037] Step (2) Then change the tool and roughen the profile of the φ16 bullnose core box for the second time.

[0038] Step (3): Change the tool with a φ10 ball-end cutter to finish the core box profile.

[0039] Step (4): Only for the fillet area of ​​the core box surface that cannot be processed by the φ10 ball nose knife, replace the φ8 ball nose knife for finishing; according to the size of the fillet design of the core box surface, the φ8 ball nose For the rounded area of ​​the core box surface that cannot be...

Embodiment 3

[0043] Embodiment 3: use RuT300 cast iron as the object to process a sand casting mold core box 1 set, 1 piece, the core box has a rounded corner area of ​​R3.2mm, and process it with a general-purpose machining center machine tool.

[0044] Specific steps are as follows:

[0045] Step (1): After fixing a piece of RuT300 cast iron blank used for processing the core box on the machine table, first use a φ35 bullnose knife core box profile to quickly rough it.

[0046] Step (2) Then change the tool and roughen the profile of the φ16 bullnose core box for the second time.

[0047]Step (3): Change the tool with a φ10 ball-end cutter to finish the core box profile.

[0048] Step (4): Only for the fillet area of ​​the core box surface that cannot be processed by the φ10 ball-end knife, replace the φ8 ball-end knife for finishing; the size of the core according to the fillet design of the core box surface is R3.2mm For the fillet area of ​​the box surface, continue to replace the φ...

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Abstract

The invention provides a processing and manufacturing method for a high precision sand casting mold. The processing and manufacturing method comprises the following steps that (1) a large diameter cownose knife in the entire mold surface area needed to be processed according to normal procedures is used for a rapid rough; (2) the knife is changed, and a small cow nose knife with a diameter smaller than the cow nose knife of the rapid opening is used for secondary rough; (3) the knife is changed, and the entire mold surface area is finished with a ball-end cutter of a suitable diameter; (4) referring to the diameter of the current ball-end knives, the ball-end knife with a diameter smaller than the current ball-end knives is replaced to finish the finishing of round areas on the mold surface only for the current ball-end knife, and according to the size of the round design on the mold surface, the procedure is repeat for multiple changing the knife; and (5) a planar area is finished with a root knife. The processing and manufacturing method for the high precision sand casting mold can shorten the processing time of a set of mould by more than 35% in the case of the machine tool andtool parameters unchanged.

Description

technical field [0001] The invention relates to a processing and manufacturing method of a sand casting mold, in particular to a processing and manufacturing method of a high-precision sand casting mold for automobile castings. Background technique [0002] At present, foreign automobile manufacturers have high requirements for some automotive castings: casting cast iron flaw detection ASTME446Ⅲ level, casting tolerance ISO8062-CT-9, the physical shape of the casting should be compared with the 3D scanning, and the tolerance inspection of 0.3mm should be carried out according to the contour benchmark. Some casting shapes Complicated, the minimum fillet reaches R2mm, and the automobile manufacturers also have a relatively urgent requirement on the time to get the samples. Usually, it only takes about 15 days for the factory to receive the task and deliver the samples. requirements. [0003] Now the processing of the mold has developed to the programmed NC (Numerical Control)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/24
CPCB23P15/24
Inventor 刘中景刘松奇王瑞金余嗣瑞李刚宋会然
Owner 西峡飞龙特种铸造有限公司
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