Archive for November, 2016

what is Punch noise solution?

Punching noise problems can be divided into no-load noise and load noise. No-load no-load operation noise Punch noise, it is the motor noise, the separation of labor organizations, the outbreak of block noise, clutch and gear impact noise. Load noise is an increase in noise punching, punching, selection (such as punching, drawing, bending) processing different punching process and noise exist in the open punch press.

First, no-load noise

1 Clutch noise. While away from the closing device punch at the same time, a lot of the whole county “Ding Dong” sound. This is the centrifugal force that the connecting rod slider reverses the material in the inertia force and the crankshaft is exposed to the sound of collision rejection. Habits: Clutch contact impulse size of the state of the clutch noise, material conditions determine the level of hit rate; the stiffness and damping of the character are also related to the war-related material. Clutch rigidity and failure of the two, in the middle and small tonnage punch high noise, the most widely used type of key to pass the noise of the lover, is a series of effects of incitement.

2 things the noise of the unit interval. Three punch and vice president of the crank slider body: crankshaft journal and crank bearing crank bearing big end bearing; (ball head); connecting rod small end and sliding ball head seat. Because the absurdities of establishing and plotting are inevitable, the fulcrum into which they are arrested retains a gap. Each movement between them, from the transition to liberalization of the fire, will inevitably bring a strong impact, broadband noise, high-frequency unilateral strong. The greater the gap, the higher the noise. Of the gap, the break, the slider to chat with a higher signal to noise ratio, to promote.

3 motor noise. As a power supply, the noise generated by the electromagnetic noise is the work of motor noise and mechanical noise of the atmospheric energy of the motor winding. Sound pressure level Motor noise and motor power speed, speed coherence. Motor electromagnetic noise, mainly through the alternating electromagnetic field to encourage mutual infection of the rotor and stator vibration occurs. High – frequency noise electromagnetic noise. Pneumatic noise of the main motor If the cooling fan noise, and the motor is a lot of transactions, cooling fan noise has begun to noise source. Dementia with little noise in the emergency command by rotating the lame nonuniform force components into the noise and vibration part when mitigating

Two, load noise

Wang Renyu load running noise source is stamping tool and workpiece or stripping plate and the impact of the gap between the process of torsion damage and punch. Punching process and punching shear torsion impact maximum noise

1 stamping noise. Punch process separation, leaving a lot of noise. Than the noise, attracted a large number of imposition of sheet metal stamping and embossing, pressure wave, flanging, twists and turns, noise small drawing process.

Torsional shot noise. Similar to the punch press, the hammer noise and punching plate thickness, hardness, and more, hammer speed parts, mold clearance state, such as coherent, increase the noise with these values. Punch work, punch and blank, blank and stripper plate collision attack is extremely strong, with the impact of the impact of increased speed of sound, as shown in Figure 1. The acoustic noise of the material and the self-collision can be far away from the measurement after the measurement has been put into practice. In the punch thick, hard material mediation, blanking Blanking noise is thinner, soft material professional. The punching process handles the sheet thickness ductility, the similar size and the arrival of the impact noise.

Impact of Punching Abrasive Tool on Service Life of Press

Punch mold can be divided into single mold works, compound mold, mold three kinds according to the authorities to continue. Need more of the first two people are not compatible with the economic function, always die can be the result of high accumulation. Communications, control and continue to die at high speed, and you produce the product (including all the products processed with a punch, Foxconn Group has terminals, computer cases and connectors used in hardware and the current mobile phone parts, etc.). Prepared for gradual death should pay attention to the polarization between the weight of the module, the precision of machining parts, accuracy, precision matching group to establish punch and participate in the topic, combined with mold production target.

Punch thinking mode to see:

Punch die in the structure can be divided into two cases: a limit (1). (2) common parts. Changes in the product. A total of part of the standards or norms, according to the gap between the finished product and the reform is normal.

The composition and the two. Template specification:

1 template composition

The composition of the press tooling will vary depending on the type and composition of the mold, the sequence, the type of traps, and the top-down physical layout. The former is the key to constructing the most frequently used, the latter structure or the extra deep drawing die.

The main work of this paper is:

(1) digital mapping – the three-dimensional products and mold models and two-dimensional engineering drawings, to change the traditional treatment;

(2) the digital bed model – the product of the mold and the product of the association hope to be born, the mold of the three – dimensional solid model;

Digital simulation (3) die – to clarify the product of the forming process analysis, terms, understand the structure of the mold parts of the thermal decomposition table, drowsiness hands and feet mold;

(4) product formation process imitation – injection molding, punch;

(5) custom sound company mold set its order and standard adjustment;

(6) mold production and processing.

Specification 2 of the mold

. The size of the mold and the locking screw

The template size should be larger than the taskbar and select a typical template size. The template locking screw shows the relationship between mold size and mold size. The most frequently manipulated tooling locking screws are based on the four corners of the case and can be used in geo-paradigm behavior. The long letter series of molds most frequently used locking screws in four corners to create and center the center of gravity.

(1). template

The overall correlation structure, the template thickness choice and the mold punch processing type, the punch cutting force, the punch processing precision and so on. According to the thickness of the mold to determine the appearance of the revelation is heavy, the experience gained and the strategy to use the appropriate template thickness usually, although not uniform, height and clamping height of the mold standard, simple procurement and inventory management.

Template four:

The main template for the continuous punching fixed plate, platen, the mother template, etc., according to precision machining, punch products, to convince the eel processing mold production, to provide assistance, if the following three mold repair steps: (2) 1) yoke, (2) insertion.

1 piece style

A block template is also known as a structure type, and air must be turned off for processing. The overall template for the purely structural or precision molds is mainly high, cutting the main template (3) processing methods to receive the thermal action must be wire-cut processing or EDM and grinding. The length of the template size is good (no heat treatment) will select two or more types and.

2 yoke type

Yoke-type template to remove the central groove-type block product assembly. With the operation of the volts under the construction, the groove is also composed of templates. The yoke template structure price: ditch easy processing, ditch processing precision width can transform, well and so on. But low rigidity optimization finds losses.