KR100431281B1 - production method of cam-holder for circular knit machine - Google Patents
production method of cam-holder for circular knit machine Download PDFInfo
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- KR100431281B1 KR100431281B1 KR10-2001-0050534A KR20010050534A KR100431281B1 KR 100431281 B1 KR100431281 B1 KR 100431281B1 KR 20010050534 A KR20010050534 A KR 20010050534A KR 100431281 B1 KR100431281 B1 KR 100431281B1
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- finishing
- cam holder
- square
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P13/00—Making metal objects by operations essentially involving machining but not covered by a single other subclass
- B23P13/02—Making metal objects by operations essentially involving machining but not covered by a single other subclass in which only the machining operations are important
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P17/00—Metal-working operations, not covered by a single other subclass or another group in this subclass
- B23P17/02—Single metal-working processes; Machines or apparatus therefor
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- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
본 발명은 주조에 의해 소형 사각축 형태의 사각소재를 제조하는 주조공정과, 상기 주조공정에서 주조된 사각소재(10)를 밀링머신에 의해 외곽을 황삭하는 황삭가공공정과, 상기 황삭가공공정에서 황삭된 사각소재(10)를 4축(x,y,z,a)제어머시닝센터(20)에 의해 정삭가공(단면정삭, 키홈가공, 탭과 핀구멍가공, 볼트구멍가공 및 45°카운터 보오링)하는 정삭가공공정과, 상기 정삭가공공정에서 정삭가공된 사각소재(10)를 밴드소잉머신(band sawing machine)에 의해 캠홀더(11) 개체들로 절단하는 절단공정으로 이루어져, 주조된 4각형상 소재의 축을 4축제어머시닝센터(20)에 의해 가공하고 절단히여 캠홀더(11)들을 생산하도록 하므로, 캠홀더(11) 소재 및 가공장비를 소형화시킬 수 있도록하고, 이로 인해 필요 작업공간 및 가공장비의 설치면적이 축소되도록 하며, 공정을 줄여 주어 투입되는 인력과 제조원가가 절감되도록 하고, 생산성이 향상되도록 하는 환편기의 실린더 캠홀더 제조방법이다.The present invention is a casting process for producing a square material in the form of a small square shaft by casting, rough machining process for roughing the outline of the square material 10 cast in the casting process by a milling machine, in the roughing process Finishing the roughed square material 10 by 4 axis (x, y, z, a) control machining center 20 (face finishing, keyway machining, tap and pinhole machining, bolt hole machining and 45 ° counterbore) O-ring) and the cutting process of cutting the rectangular material 10 finished in the finishing process into the cam holder 11 by a band sawing machine, and cast 4 Since the axis of the square material is processed and cut by the 4-axis control machining center 20 to produce the cam holders 11, the cam holder 11 material and the processing equipment can be miniaturized, and thus the required work space And reduce the installation area of processing equipment To reduce labor and manufacturing costs to be reduced given the input, and a method for manufacturing a cylinder cam holder for a circular knitting machine that allows greater productivity.
Description
본 발명은 환편기의 실리더 캠홀더 제조방법에 관한 것으로, 제조가 용이하도록 하고 작은공간에서 제작이 가능하며, 물류이동비와 제조비용이 절감되도록 하며, CNC로터리테이블을 활용한 4축 제어장비의 응용기술에 의해 가공장비가 소형화 되어 가공장비 설치면적의 축소화와 공정 축소로 인한 인력투입과 원가가 현저하게 절감되도록 하는 것이다.The present invention relates to a method for manufacturing a cylinder cam holder of a circular knitting machine, to facilitate the manufacture and to be manufactured in a small space, to reduce the logistics movement cost and manufacturing cost, the four-axis control equipment using a CNC rotary table The application technology reduces the size of processing equipment so that labor input and cost are significantly reduced due to the reduction of the installation area of processing equipment and the reduction of processes.
통상적으로 환편기에는 원주면에 다수의 편침이 결합된 실린더가 구비되고, 도 1에 도시되는 바와 같이, 상기 실린더의 원주면 외향에 실린더의 중심을 향하도록 방사상으로 다수의 캠홀더(1)가 구비되며, 캠홀더(1)들의 하단이 환형의 캠플레이트(3) 동심원상에 고정된다. 또한, 각 캠홀더(1)의 내면에는 캠(2)이 결합되며, 상기 각 캠(2)에는 캠곡선요홈이 형성되어 편직조에 따라 편침의 승강을 안내유도하는 편침의 버트가 상기 캠곡선요홈에 결합된다.Typically, the circular knitting machine is provided with a cylinder coupled to a plurality of needles on the circumferential surface, as shown in Figure 1, a plurality of cam holder (1) is provided radially to face the center of the cylinder outward of the circumferential surface of the cylinder The lower ends of the cam holders 1 are fixed on the concentric circles of the annular cam plate 3. In addition, a cam 2 is coupled to an inner surface of each cam holder 1, and a cam curved groove is formed in each cam 2 so that a butt of a knitting needle guides the lifting and lowering of the knitting needle according to the weaving. Is coupled to.
여기에서, 종래 캠홀더(1)는 내부면에 캠(2)의 미세 위치조정용 조절부재를 설치하기 위한 장홈이 형성되며, 상기 장홈의 양측에는 캠(2)을 체결시키기 위한 다수의 체결공이 형성되어 있다. 또한, 하단부가 캠플레이트(3)에 접촉되도록 되며, 캠(2)이 실린더의 원주와 동심원을 이룰수 있도록 내부면이 소정곡률의 곡면으로 가공되어 있다.Here, the conventional cam holder 1 is formed with a long groove for installing the adjustment member for adjusting the fine position of the cam 2 on the inner surface, a plurality of fastening holes for fastening the cam 2 is formed on both sides of the long groove It is. In addition, the lower end portion is brought into contact with the cam plate 3, and the inner surface is machined into a curved surface having a predetermined curvature so that the cam 2 can be concentric with the circumference of the cylinder.
이러한 캠홀더(1)의 제조공정은 다음과 같다.The manufacturing process of such a cam holder 1 is as follows.
1)주조에 의해 소정 직경의 원형단면의 대형 원형소재 제조.1) Manufacture of large circular material of circular cross section of predetermined diameter by casting.
2)상기 대형 원형소재의 외주면 및 내주면을 대형 터닝머신에 의해 황삭가공.2) Rough machining of the outer circumference and inner circumference of the large circular material by a large turning machine.
3)상기 황삭한 원형소재의 외주면 및 내주면을 대형 터닝머신에 의해 정삭가공.3) Finishing the outer circumferential surface and the inner circumferential surface of the rough circular material by a large turning machine.
4)상기 정삭가공한 원형소재를 전용 인덱싱머신에 의해 마킹.4) Marking the finished circular material by the dedicated indexing machine.
5)전용 인덱싱머신에 의해 상기 원형소재에 탭 및 핀볼트자리 가공.5) Tab and pin bolt seat processing on the circular material by dedicated indexing machine.
6)전용 인덱싱머신에 의해 상기 원형소재에 캠 간극조절기능홀 가공 및 상면의 볼트자리가공.6) Machining of the cam gap adjusting function hole on the circular material by the dedicated indexing machine and bolting on the upper surface.
7)전용 인덱싱머신에 의해 상기 원형소재에 45°카운터보오링.7) 45 ° counterboring to the circular material by dedicated indexing machine.
8)분할장치에 의해 상기 원형소재를 다수개의 캠홀더 개체로 절단가공.8) The circular material is cut into a plurality of cam holder objects by a split device.
9)상기 절단된 캠홀더를 사상, 세척, 검사.9) Finishing, cleaning and inspecting the cut cam holder.
10)상기 검사 완료한 캠홀더를 도장.10) Paint the finished cam holder.
이러한 종래 캠홀더의 제조공정은 대형 원형 타입의 소재로 주조하여 가공하기 때문에, 제조시 넓은 제조 및 가공공간을 필요로 하고, 가공공정 진행시 소요장비의 대형화가 필요하게 되며, 공정의 안과 밖을 분리하여 가공하게 되므로 준비시간이 과다하게 투입되게 되고, 물류 이동의 시간이 길어지고, 많은 고가장비와 인력이 투입되어야 하는 단점이 있었다.Since the manufacturing process of such a conventional cam holder is cast and processed in a large circular type of material, a large manufacturing and processing space is required during manufacturing, and the required equipment needs to be enlarged during the processing process. Since the separate processing, the preparation time is excessively input, the time of logistics movement is long, and many expensive equipment and manpower have to be input.
본 발명은 상기와 같은 종래 단점들을 해결하기 위해, CNC 로터리테이블을 이용한 4축 제어장비에 의해 일정길이의 4각형상 소재의 축을 가공하고, 상기 가공한 축을 일정 길이의 캠홀더들로 절단하도록 하여, 캠홀더 소재 및 가공장비가 소형화되도록 하므로 필요 작업공간 및 가공장비의 설치면적이 축소되도록 하고, 공정을 간소화시켜 인력투입이 절감되도록 하며, 이로 인해 제조원가가 절감되고 생산성이 향상되도록 하는 환편기의 실린더 캠홀더 제조방법을 제공하는데 그 목적이 있다.The present invention is to solve the above disadvantages, by machining the axis of the square material of a certain length by a four-axis control equipment using a CNC rotary table, and to cut the processed shaft into cam holders of a predetermined length In addition, the cam holder material and processing equipment can be miniaturized, so that the required working space and installation area of the processing equipment can be reduced, and the manpower input can be reduced by simplifying the process, thereby reducing manufacturing costs and improving productivity. It is an object of the present invention to provide a method for manufacturing a cam holder.
도 1은 일반적인 환편기의 실린더 캠홀더 장착구조를 나타내는 사시도1 is a perspective view showing a cylinder cam holder mounting structure of a general circular knitting machine
도 2는 본 발명의 제조공정을 나타내는 블록도2 is a block diagram showing a manufacturing process of the present invention.
도 3은 본 발명의 사각소재를 4축 제어장비에 의해 가공하는 상태를 나타내는 예시도Figure 3 is an exemplary view showing a state of processing the rectangular material of the present invention by the four-axis control equipment
도 4는 본 발명의 캠홀더용 사각소재를 나타내는 사시도Figure 4 is a perspective view showing a square material for cam holder of the present invention
도 5는 본 발명의 캠홀더를 나타내는 사시도5 is a perspective view showing a cam holder of the present invention
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10 : 사각소재 11 : 캠홀더10: square material 11: cam holder
20 : 4축제어머시닝센터 21 : 테이블20: 4-axis machining center 21: Table
22 : 센터 23 : CNC로터리머신22: Center 23: CNC Rotary Machine
24 : 주축헤드 25 : 지그24: spindle head 25: jig
본 발명은 주조에 의해 소형 사각축 형태의 사각소재를 제조하는 주조공정과, 상기 주조공정에서 주조된 사각소재를 밀링머신에 의해 외곽을 황삭하는 황삭가공공정과, 상기 황삭가공공정에서 황삭된 사각소재를 4축 제어기능의 머시닝센터에 의해 정삭가공하는 정삭가공공정과, 상기 정삭가공공정에서 정삭가공된 사각소재를 밴드소잉머신(band sawing machine)에 의해 복수개의 캠홀더 개체로 절단하는 절단공정과, 상기 절단공정에서 절단된 캠홀더를 사상하고 세척한 다음 검사하는 사상 검사공정과, 상기 사상 검사공정에서 검사된 캠홀더의 외부면을 도색하는 도장공정으로 이루어지는 것을 그 기술적 방법의 기본 특징으로 한다.The present invention is a casting process for producing a square material in the form of a small square shaft by casting, a roughing process for roughing the outline of the square material cast in the casting process by a milling machine, and the square roughed in the roughing process Finishing process for finishing the material by machining center with 4-axis control function, and cutting process for cutting the rectangular material finished in the finishing process into plural cam holders by band sawing machine. And a finishing inspection step of finishing, cleaning and inspecting the cam holder cut in the cutting process, and a painting process of painting an outer surface of the cam holder inspected in the finishing inspection process as a basic feature of the technical method. do.
이하 첨부된 도면을 참조하여 본 발명의 실시예를 상세히 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 제조공정을 나타내는 블록도이고, 도 3은 본 발명의 사각소재를 CNC 로터리테이블을 이용한 4축 제어장비에 의해 가공하는 상태를 나타내는예시도이며, 도 4는 본 발명의 캠홀더용 사각소재를 나타내는 사시도로서, 본 발명은 주조공정에 의해 15개의 캠홀더가 생산될 수 있는 정도의 사각축 형태의 사각소재(10)를 제조하고, 상기 주조공정에서 주조된 사각소재(10)를 황삭가공공정에서 밀링머신에 의해 외곽을 황삭가공하며, 상기 황삭가공공정에서 황삭된 사각소재(10)를 정삭가공공정의 4축제어머시닝센터(20)에 의해 정삭가공한다. 또한, 상기 정삭가공공정에서 정삭가공된 사각소재(10)를 절단공정의 밴드소잉머신(band sawing machine)에 의해 절단하여 평면의 캠부착면을 갖는 15개의 캠홀더(11) 개체를 생산하며, 상기 절단공정에서 절단된 캠홀더(11) 개체를 사상 검사공정에 의해 사상하고 세척한 다음 검사하고, 상기 사상 검사공정에서 검사된 캠홀더(11)의 외부면을 도색한다.Figure 2 is a block diagram showing a manufacturing process of the present invention, Figure 3 is an exemplary view showing a state of processing the rectangular material of the present invention by a four-axis control equipment using a CNC rotary table, Figure 4 is a cam of the present invention As a perspective view illustrating a rectangular material for a holder, the present invention manufactures a rectangular material 10 of a square shaft shape to the extent that 15 cam holders can be produced by a casting process, and the rectangular material 10 cast in the casting process 10. ) Roughing the outside by a milling machine in the roughing process, and the square material 10 roughed in the roughing process is finished by the four-axis control machining center (20) of the finishing process. In addition, the square material 10 finished in the finishing process is cut by a band sawing machine (band sawing machine) of the cutting process to produce 15 cam holders 11 having a flat cam attachment surface, The cam holder 11 cut out in the cutting process is subjected to finishing, cleaning and inspection by the finishing inspection process, and the outer surface of the cam holder 11 inspected in the finishing inspection process is painted.
여기에서, 본 발명의 캠홀더는 도 5에 도시되는 바와 같이 4각형상의 입체 상단부 외측면이 상단폭이 좁아지게 경사면으로 형성되고, 하단부 외측면이 하단 외측으로 돌출되게 경사면이 형성되어 상기 경사면에 고정볼트 체결용 구멍이 형성되며, 캠이 결합되도록 되는 내측면이 평면으로 형성되고, 내측 하단에 캠플레이트에 지지되도록 하는 걸림턱이 형성된다.Here, the cam holder of the present invention, as shown in Figure 5 is formed in the inclined surface so that the top surface of the three-dimensional solid upper end portion is narrowed, the inclined surface is formed so that the lower end outer surface protrudes to the bottom outside to the inclined surface The fixing bolt fastening hole is formed, the inner surface to be coupled to the cam is formed in a plane, the locking step is formed on the inner lower end to be supported by the cam plate.
이러한 캠홀더(11)는 여러개가 측면부에 의해 연속적으로 연결된 것과 같은 형상의 사각소재(10)의 주물을 가공하고 절단하여 생산한다.The cam holder 11 is produced by processing and cutting the casting of the rectangular material 10 of the shape such that several are continuously connected by the side portion.
한편, 정삭가공공정의 4축제어머시닝센터(20)는 도 3에 도시되는 바와 같이, 베이스 상부에 전후(Y축) 및 좌우(X축)방향으로 이동 가능하게 테이블(21)이 설치되어 테이블(21)의 상면 일측에 좌우 방향으로 이동 가능하게 센터(22)가 설치되고, 센터(22)와 대향되는 위치의 테이블(21) 타측 상면에 회전(A방향) 구동이 가능한 CNC로터리머신(23)이 설치되며, 테이블(21)의 상부에 상하(Z축)방향으로 이동 가능하게 장치되고 주축 하단부에 가공날이 회전구동 가능하게 장치되는 주축헤드(24)가 설치된다.On the other hand, the four-axis control machining center 20 of the finishing machining process, as shown in Figure 3, the table 21 is installed on the base so as to be movable in the front and rear (Y-axis) and left and right (X-axis) direction table Center 22 is installed on one side of the upper surface of the 21 to move in the left and right, and the CNC rotary machine 23 capable of rotation (A direction) drive on the upper surface of the other side of the table 21 at the position opposite to the center 22 ) Is installed, and the spindle head 24 is installed on the upper part of the table 21 so as to be movable in the vertical direction (Z axis) and the lower end of the spindle is installed to be rotatable.
이러한 4축제어머시닝센터(20)는 센터(22)와 CNC로터리머신(23) 사이에 2개의 사각소재(10)를 고정하는 지그(25)가 착탈 가능하게 고정되도록 되고, CNC로터리머신(23)이 중앙처리장치에 의해 일정각도 회전이동(A방향)이 제어 되도록 장치되며, 주축헤드(24)의 주축이 상기 중앙처리장치에 의해 상하 방향으로 이동과 회전이 제어되도록 장치되고, 테이블(21)이 상기 중앙처리장치에 의해 전후방향(Y)과 좌우방향(X)으로의 직선이동이 제어되도록 장치된다.The four-axis control machining center 20 is a jig 25 for fixing the two rectangular material 10 between the center 22 and the CNC rotary machine 23 to be detachably fixed, the CNC rotary machine 23 ) Is controlled so that the rotational movement (A direction) at a constant angle by the central processing unit, the main shaft of the spindle head 24 is arranged so that the movement and rotation in the vertical direction by the central processing unit is controlled, the table 21 ) Is installed so that the linear movement in the front-rear direction Y and the left-right direction X is controlled by the central processing unit.
이러한 본 발명은 주조한 주물의 사각소재(10)를 지그(25)에 고정하고, 상기 지그(25)를 센터(22)와 CNC로터리머신(23)에 고정한 다음, 제어장치를 조작하여 정삭가공 즉, 단면정삭, 키홈가공, 탭과 핀구멍가공, 볼트구멍가공 및 45°카운터 보오링 등을 완료하며, 이렇게 정삭가공된 사각소재(10)를 밴드소잉머신에 의해 일정 간격으로 절단하여 캠홀더(11) 개체를 생산한다..The present invention is fixed to the casting cast rectangular material 10 to the jig 25, the jig 25 is fixed to the center 22 and the CNC rotary machine 23, then the control device is operated to finish machining In other words, it finishes section finishing, keyway processing, tap and pin hole processing, bolt hole processing and 45 ° counter boring, and cuts the finished square material 10 at a predetermined interval by band sawing machine to cam holder. (11) Produce individuals.
따라서 이러한 본 발명은 캠홀더(11)의 캠 부착면이 평면으로 형성되어, 캠부착면이 평면상태를 유지하므로 핀홀을 2개 추가하여 맞춤핀 조립을 할 수 있게 되고, 이로 인해 대형 원형 타입의 종래 제조방법에 비하여 조립성과 제품의 질이 향상되게 되며, 조립 호환성도 좋게 된다. 또한, 대형 원형 타입의 종래 제조방법에 비하여 공정이 축소되어 공정간 이동 불량률이 줄어들고, 불량이 발생할 경우 발생하는 재료비 손실 및 가공비 손실이 대폭 절감되게 된다. 실예로 종래 원형링 소재 1개가 불량나는 경우 70 ~ 90개의 캠홀더가 손실되는 반면, 본 발명은 그것의 17%인 15개만 손실되게 되며, 최종공정에서 불량이 발생되는 경우, 가공비는 종래제조방법에 의한 손실의 87.5%를 절감하게 된다. 또한, 종래 제조방법에서 주조한 소재의 무게가 57kg인데 비해 본 발명 사각소재의 무게는 19kg으로 생산되어, 대향원형 상태의 종래 소재를 주조 생산할 때에 비하여 작은 공간이 소요되고, 주조 및 가공상의 물류 이동비용이 절감되게 되며, 가공장비 또한 소형화가 가능하여 CNC로터리 테이블을 활용한 4축제어장비에 의해 단일 공정에서 여러 가공을 완성 가능하도록 하며 이로 인해 투입되는 가공장비와 인력이 줄어들도록 한다.Therefore, in the present invention, the cam attaching surface of the cam holder 11 is formed in a flat shape, and thus the cam attaching surface is maintained in a flat state, so that two pinholes can be added to assemble the dowel pin, thereby allowing a large circular type. Compared with the conventional manufacturing method, the assembly and product quality are improved, and the assembly compatibility is also good. In addition, the process is reduced compared to the conventional manufacturing method of the large circular type to reduce the movement failure rate between processes, the material cost loss and processing cost loss that occurs when a failure occurs is greatly reduced. For example, when one conventional ring material is defective, 70 to 90 cam holders are lost, whereas the present invention loses only 15, which is 17% thereof, and when the defect occurs in the final process, the processing cost is a conventional manufacturing method. The savings are 87.5% of the losses. In addition, while the weight of the material cast in the conventional manufacturing method is 57kg, the weight of the square material of the present invention is produced in 19kg, it takes a small space compared to the casting production of the conventional material in the opposite circular state, the logistics movement in casting and processing The cost is reduced, and the processing equipment can also be miniaturized, so that the four-axis control equipment using the CNC rotary table can complete several processes in a single process, thereby reducing the processing equipment and manpower.
본 발명은 4축제어장비에 의해 4각형상 소재의 축을 가공하고 절단하여 캠홀더들을 생산하도록 하므로, 캠홀더 소재 및 가공장비를 소형화시킬 수 있도록하고, 필요 작업공간 및 가공장비의 설치면적이 축소되도록 하며, 공정을 간소화시킬 수 있도록 하여, 투입되는 인력과 제조원가가 절감되도록 하고, 생산성이 향상되도록 한다.The present invention is to produce the cam holder by processing and cutting the axis of the square material by the four-axis control equipment, so that the cam holder material and processing equipment can be miniaturized, so that the required work space and the installation area of the processing equipment is reduced In addition, the process can be simplified to reduce the manpower and manufacturing cost, and to improve the productivity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100869315B1 (en) | 2007-05-17 | 2008-11-18 | 김병수 | A valve body manufacturing apparatus of load sensing proportioning valve and valve body manufacturing process using the same |
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| KR100929903B1 (en) * | 2003-02-06 | 2009-12-04 | 한라공조주식회사 | Piston processing method of swash plate compressor |
| KR100921902B1 (en) * | 2008-04-14 | 2009-10-14 | 삼익정공(주) | A Round Shaft Support Manufacturing Method in the Linear Bushing and the Round Shaft Support manufactured by Its Method |
| CN107414414B (en) * | 2017-05-08 | 2019-04-02 | 江苏涞森环保设备有限公司 | The processing method of middle shell for volute extruding-desiccation machine |
| CN112296413B (en) * | 2020-10-16 | 2022-05-27 | 漳州市永良针纺机械有限公司 | Intelligent processing method and device for circular knitting machine accessory |
| CN112276180B (en) * | 2020-10-23 | 2022-05-27 | 漳州市永良针纺机械有限公司 | Efficient machining process for central group of circular weft knitting machine |
| CN112296409B (en) * | 2020-10-23 | 2022-05-27 | 漳州市永良针纺机械有限公司 | Method and equipment for machining circular knitting machine accessory |
| CN112276179B (en) * | 2020-10-23 | 2022-05-27 | 漳州市永良针纺机械有限公司 | Method and device for machining circular knitting machine accessory |
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