以螺絲類型來說，IMU牙板特別適用于輾造各種標準機械螺絲(栓)及組合螺絲(栓)。

以螺絲材質來說，

IMU 標準牙板(M2鋼材)建議使用之應用如下︰

1.加工量大需長時輾造的低碳鋼組件(未經熱處理)。

2.未超過120,000 psi張力強度之 300 & 400系列不銹鋼。

3.合金或未超過36 HRC硬度之熱處理后組件。

IMU超級牙板(M42鋼材)建議使用之應用如下︰

1.應用于航空器的材料，例如鈦合金零件 A-286、 8740、4047、耐高熱鎳基合金零件。

2.就是用于任何超過硬度36 HRC的組件。

我公司有完備的庫存，對于各種規格之機械牙板，都能迅速送達。

IMU 牙板-世界最精準的牙板

IMU 牙板的牙紋輪廓可滿足各種牙紋之要求，如M、MJ、UN、UNC、UNF、UNRC、UNRF、UNJ、UNJC、UNJF等，絕對符合航天、汽車、飛機、精密儀器和其他高精準度之工業的標準。目前歐洲過半的飛機制造所需之螺絲，均由IMU牙板輾造，可見IMU 牙板受世界高端用戶肯定之程度。

以下標準公差，適用于所有的IMU牙板。如客戶要求，IMU可以制造更小公差之牙板。

下圖說明了典型的IMU牙板壽命/磨損曲線，和一般的牙板比較，可以明顯的看出IMU牙板的品質優于一般牙板。

意大利IMU牙板常用尺寸表

PRELIMINARY INSTRUCTIONS 初步的操作說明

Check the following.查核如下

1) The rams1ide must not have too much play. Place a lever between the ramslide and its pocket and exert pressure by hand. Check play with the aid of a comparator. The maximum play should not exceed 0.004". Make sure to repeat this operation on both ends of the ramslide, testing it at various stages through the stroke.

1)主滑臺必須穩定不可有太多的晃動，放置一塊長鐵板于主滑臺和牙板座之間用手使勁的撬動，使用比較測定機來測定晃動?；蝿泳嚯x不可大于0.004"，在主滑臺的兩瑞重復施作這一個動作，并在主滑臺多點行距中重復的用手使勁的撬動。

2) Both die pockets must be clean and devoid of flash or metal chips,

2)兩個牙板座必須要干凈不可有毛邊及金屬屑片。

3) Shims (if required) must not have flash and must be perfectly plain.

3)如需要使用墊片時、也必須絕對干凈不可有毛邊。

4) When IMU dies are set into the threadroller, the markings on both dies must be visible, i.e. facing up. In the case of duplex dies, the markings of both dies will face up or down at the same time.

4)當IMU的牙板放置于輾牙機中時，有刻字的部份必須同時向上或向下(雙面牙板時)。

5) When using re-ground dies, the total width of each die with shims must equal the initial width of the die when new.

5)當使用再制的牙板時，每一塊牙板的補償厚度必須和新( 原尺寸 )的牙板相等。

6) After setting the dies into the threadroller, it is always better to reduce die squeeze when rolling the very first parts; otherwise, the dies can be damaged.

6) 當牙板置放于輾牙機中后，在每次輾造第一個螺絲時，應盡量減低擠壓的壓力，否則，牙板會被損毀。

7) During the rolling operation, die squeeze has to be kept as low as possible, since a slight excess of pressure will reduce die-life.

7) 于輾牙的操作中，牙板應盡量減低擠壓的壓力，因一輕微的過壓會減低牙板的壽命。

STEP 1

Check die upper level, as shown here. Place a perfectly straight steel rule on the upper side of both dies. Let the ramslide move idle and make sure that the upper sides of both dies find themselves at the same level during the 3 following moments:

如示、檢查牙板的上頂部水平。置放一完全筆直的鋼尺在兩牙板的頂部。由如下的3個動作、讓主滑臺空轉滑動并確保兩牙板的上頂部在同一水平上。

1) at the start of the stroke, when the blank is fed between the dies; 2) halfway through the stroke, when the centres of both dies face each other; 3) at the end of the stroke, when the part is rolled out of the dies.

1) 在滑動行程的開始，當未輾造的螺絲(光釘)已喂送入兩塊牙板中間。2) 在滑動行程的一半, 當兩塊牙板的中心點正面相對時;3) 在滑動行程的末端, 當輾造的螺絲(光釘)已離開兩塊牙板中間。

STEP 2

Check die vertical parallelism, as shown here. Roll a blank after having reduced die squeeze, without forming the thread fully; make sure that the external diameter is constant along the whole threaded length: the rolled part must not be conical

檢核垂直的平行度，如下所示。以漸增的壓力輾造光釘，不要一次輾成滿牙。要確保輾造的縲釘的全長外徑一至，輾造的縲絲不可成錐型。

STEP 3

Check die horizontal parallelism and the correct starting position of the blank. Horizontal parallelism is checked by placing gauges in between the straight parts of both dies, i.e. not taking into consideration die tapers. Distances A and B must be equal. In order to achieve a correct start of the blank, C must be equal to the difference in length of both dies, divided by 2.

檢檢核水平的平行度及未輾造螺絲(光釘)正確的輾壓起始點、藉由置放量測工具(塊規)于兩塊牙板的中間以檢核水平的平行度。即、不要把牙板有錐度部份列入考慮。A. B 兩端必須等距。正確的輾壓起始點為兩塊牙板的長度相減除以2 。

STEP 4

Check if the blank is fed correctly. Make sure the rails and the pusher blade are not worn out or warped. The set-up has to be carried out so that the blank is properly placed before the dies by the pusher blade, otherwise, if there is play, it may not start off properly.

檢核、輾造螺絲的送料(喂料)是否正確:確定滑軌及送料刀沒有損傷及變形、藉由送料刀將未輾造的螺絲送到正確位置，否則、稍有晃動、就不會有正確的起始點。

STEP 5

Check die set-up, as shown here. After having reduced die squeeze as much as possible, the blank must undergo a little more than half a revolution so that the thread crests of the dies mark the shank. Take the blank out from the dies by retreating the moving die and see if the marks left by the moving die match with those left by the fixed die. In case the matching is wrong, correct it by adjusting the fixed die.

核查牙板的設置、如示。以漸增的壓力輾牙，未輾造的螺釘必須至少輾(轉)動大于半轉、如此牙板的牙峰會擠印出牙紋、藉由將移動塊往后時，拿出未輾造的螺釘。并且、比對移動塊和固定塊擠印出的牙紋的差異、來做出調整。

STEP 6

Check presence of laps in the screw thread. Laps, as shown here, are formed when the dies are not properly matched. They can be detected in 2 ways. 1) Hydrochloric acid etching: after having taken all the grease off from the rolled parts, place them in the acid and keep them in for about 5-10 minutes, take them out and dry them using warm air. Then check with the aid of a magnifying glass if laps are to be seen on the thread flanks crosswise to the parts' axis. 2) Metallographic microscope: cut the rolled part lengthwise, form a test sample, polish it and check with the microscope if laps appear (see illustration).

核查出螺釘的折痕(牙裂)、折痕，如下所示、當移動塊和固定塊牙板、未做正確的配合時造成。

可經由2 種方法檢出折痕(牙裂)。1) 鹽酸酸蝕:縲釘先脫脂后酸蝕、放于鹽酸中5-10分、拿出來風干后、用放大鏡檢視折痕(牙裂)。2) 金相顯微鏡: 螺釘作箱埋后、將側剖面切開，磨光后、用金相顯微鏡檢視折痕(牙裂)。(如圖所示)。