阅读说明：本技术 一种蒸汽压缩机冷却水腔矩形螺旋槽的侧刃铣削加工方法 (Side edge milling method for rectangular spiral groove of cooling water cavity of steam compressor ) 是由 赵倩 鲁建宇 袁列军 吴�琳 邹含青 罗攀 邓欣 李鹏 于 2020-12-18 设计创作，主要内容包括：本发明公开了一种蒸汽压缩机冷却水腔矩形螺旋槽的侧刃铣削加工方法,可以防止刀具振动、磨损,加工质量更好,且成本更低。一种蒸汽压缩机冷却水腔矩形螺旋槽的侧刃铣削加工方法,包括以下步骤：S1、铣削加工出矩形螺纹起始位置的方形槽,作为立铣刀下刀位置；S2、选用立铣刀进行铣削,刀具先沿Y方向移动到矩形螺纹起始位置中间位置,再沿X方向偏移一个刀具半径,沿C轴逆时针旋转工作台6.188°；S3、固定刀轴不变,刀具两侧分别留精加工余量,通过C轴和Y轴成等比关系同时递增进行加工去除中间余量；S4、固定刀轴不变,精光两边余量,通过C轴和Y轴成等比关系同时递增进行加工去除两边余量,精光让矩形螺纹两侧无接刀痕且粗糙度满足图纸要求。(The invention discloses a side edge milling method for a rectangular spiral groove of a cooling water cavity of a steam compressor, which can prevent vibration and abrasion of a cutter, and has better processing quality and lower cost. A side edge milling method for a rectangular spiral groove of a cooling water cavity of a steam compressor comprises the following steps: s1, milling a square groove at the starting position of the rectangular thread to be used as the lower cutting position of the end mill; s2, milling by using an end mill, moving a cutter to the middle position of the starting position of the rectangular thread along the Y direction, shifting the cutter by a radius along the X direction, and rotating the worktable by 6.188 degrees anticlockwise along the C axis; s3, fixing the cutter shaft unchanged, respectively reserving finish machining allowances on the two sides of the cutter, and simultaneously increasing progressively through the equal ratio relationship between the C axis and the Y axis to machine and remove the intermediate allowances; s4, fixing the cutter shaft unchanged, finishing the margins on the two sides, machining and removing the margins on the two sides in an increasing mode through the equal ratio relation of the C shaft and the Y shaft, and finishing to enable the two sides of the rectangular thread to have no connecting cutter marks and the roughness to meet the requirements of drawings.)

1. A side edge milling method for a rectangular spiral groove of a cooling water cavity of a steam compressor is characterized by comprising the following steps:

s1, milling a square groove at the starting position of the rectangular thread to be used as the lower cutting position of the end mill;

s2, milling by using an end mill, moving a cutter to the middle position of the starting position of the rectangular thread along the Y direction, shifting the cutter by a radius along the X direction, and rotating the worktable by 6.188 degrees anticlockwise along the C axis;

s3, fixing the cutter shaft unchanged, respectively reserving finish machining allowances on the two sides of the cutter, and simultaneously increasing progressively through the equal ratio relationship between the C axis and the Y axis to machine and remove the intermediate allowances;

s4, fixing the cutter shaft unchanged, finishing the margins on the two sides, machining and removing the margins on the two sides in an increasing mode through the equal ratio relation of the C shaft and the Y shaft, and finishing to enable the two sides of the rectangular thread to have no connecting cutter marks and the roughness to meet the requirements of drawings.

2. The method for milling the side edge of the rectangular spiral groove of the cooling water cavity of the steam compressor as claimed in claim 1, wherein the method comprises the following steps: in step S1, the width of the square groove is 36 mm.

3. The method for milling the side edge of the rectangular spiral groove of the cooling water cavity of the steam compressor as claimed in claim 1, wherein the method comprises the following steps: in step S2, 20 end mills are selected for milling.

4. The method for milling the side edge of the rectangular spiral groove of the cooling water cavity of the steam compressor as claimed in claim 1, wherein the method comprises the following steps: in step S3, 0.5mm finishing allowance is left on each side of the cutter.

Technical Field

The invention relates to the technical field of vapor compressors, in particular to a side edge milling method for a rectangular spiral groove of a cooling water cavity of a vapor compressor.

Background

In recent years, the application of the vapor compressor in domestic markets is more and more extensive, the application of the vapor compressor is extended from the petroleum industry, the pharmaceutical industry and the sewage treatment industry to the chemical industry, and the vapor compressor has good market prospect. The cooling water cavity is one of the parts of the steam compressor, and the structure of the cooling water cavity is mainly provided with a rectangular groove and a rectangular thread, as shown in figure 1. The blank of cooling water cavity is the cylinder, then needs become the geometric relation through end mill diaxon and increase progressively simultaneously and process the removal allowance.

In the existing processing method, the bottom edge and the side edge of the end mill are adopted to mill the excircle thread groove, the fixed cutter shaft is not changed, the rotary worktable mills, and the bottom edge and the side edge of the end mill are simultaneously stressed during milling in the processing mode, as shown in figure 2, the bottom edge is stressed, the cutter vibrates greatly, the cutting edge is worn quickly, the quality of the processed groove surface is poor, and a new processing method must be found in order to ensure the product quality and reduce the cutter cost.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a side edge milling method of a rectangular spiral groove of a cooling water cavity of a steam compressor, which can prevent a cutter from vibrating and wearing, and has better processing quality and lower cost.

The purpose of the invention is realized as follows:

a side edge milling method for a rectangular spiral groove of a cooling water cavity of a steam compressor comprises the following steps:

s1, milling a square groove at the starting position of the rectangular thread to be used as the lower cutting position of the end mill;

s2, milling by using an end mill, moving a cutter to the middle position of the starting position of the rectangular thread along the Y direction, shifting the cutter by a radius along the X direction, and rotating the worktable by 6.188 degrees anticlockwise along the C axis;

s3, fixing the cutter shaft unchanged, respectively reserving finish machining allowances on the two sides of the cutter, and simultaneously increasing progressively through the equal ratio relationship between the C axis and the Y axis to machine and remove the intermediate allowances;

s4, fixing the cutter shaft unchanged, finishing the margins on the two sides, machining and removing the margins on the two sides in an increasing mode through the equal ratio relation of the C shaft and the Y shaft, and finishing to enable the two sides of the rectangular thread to have no connecting cutter marks and the roughness to meet the requirements of drawings.

Preferably, in step S1, the width of the square groove is 36 mm.

Preferably, in step S2, 20 end mills are selected for milling.

Preferably, in step S3, a finishing allowance of 0.5mm is left on both sides of the tool, respectively.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the invention can reduce the cutter loss, save the cost and ensure the product quality;

the invention converts the original bottom edge milling mode into the side edge milling mode. Fundamentally reduces the end sword atress of cutter, converts end sword atress direction into side sword direction atress through the mode of cutter directional skew simultaneously, lets the vibration of cutter in the course of working obtain control, makes the cutter life-span increase substantially and the cost obtains effective control, and the reduction of its vibration has more ensured the processingquality of part rectangle flank of thread.

Drawings

FIG. 1 is a schematic view of a cooling water cavity of a vapor compressor;

FIG. 2 is a schematic view of a force direction of an end mill in a conventional machining method;

FIG. 3 is a schematic view of the direction of force applied to the side edge of the end mill in the present invention;

FIG. 4 is a schematic view of the offset of the machining tool in the present invention.

Detailed Description

Referring to fig. 3 and 4, an embodiment of a method for milling a side edge of a rectangular spiral groove of a cooling water cavity of a steam compressor comprises the following steps:

firstly, the method comprises the following steps: as shown in figure 1, a square groove with the width of 36mm is milled at the starting position of the rectangular thread, so that the lower cutting position of the end mill is ensured.

Secondly, the method comprises the following steps: and (3) milling by using a 20-end milling cutter, moving the cutter to the middle position of the starting position of the rectangular thread in the Y direction, and shifting the cutter in the X direction by 10mm (the radius of the cutter), so that the feed end face of the cutter and the axial lead of the cooling water cavity are positioned on the same vertical face, and the starting processing position is unchanged as the processing position of the existing method, as shown in fig. 3 and 4. The workbench 6.188 rotates anticlockwise along the C axis, the chord length distance of 6.188 degrees of rotation is 18mm, the milling lower cutter position of the end mill can be controlled in a 36mm square groove, the bottom edge of the end mill is not directly contacted with a workpiece, the purpose is to ensure that the bottom edge stress is converted into the side edge stress when the end mill mills, the initial processing position is unchanged, and the vibration of the cutter in the milling process is controlled.

Thirdly, the method comprises the following steps: the fixed cutter shaft is unchanged, and the two sides of the fixed cutter shaft are respectively provided with a margin of 0.5mm, as shown in figure 1, the rectangular thread surrounds four circles on the cylinder, and the rectangular thread surrounding four circles can be milled only by rotating the C-axis workbench and increasing the Y value at the same time. The C axis and the Y axis are mainly adopted to form an equal ratio relation and are simultaneously and gradually increased to process and remove the intermediate allowance, the equal ratio relation is the thread pitch value of the 1-degree rectangular thread on the 360-degree C axis, and therefore the milling allowance is controlled more uniformly, and the milling error can be effectively controlled.

Fourthly: and fixing the cutter shaft unchanged, polishing both margins, and gradually increasing the C axis and the Y axis in an equal ratio relation to process and remove both margins, wherein the polishing ensures that both sides of the rectangular thread have no tool connecting mark and the roughness meets the requirements of a drawing.

The invention aims to reduce the cutter loss, save the cost and ensure the product quality; the invention relates to a method for converting an original bottom edge milling mode into a side edge milling mode. Fundamentally reduces the end sword atress of cutter, converts end sword atress direction into side sword direction atress through the mode of cutter directional skew simultaneously, as shown in fig. 3, lets the vibration of cutter in the course of working obtain control, makes the cutter life-span increase substantially and cost obtain effective control, and the reduction of its vibration has more ensured the processingquality of part rectangle flank of thread.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.