Short answer: mate pūhui tā blanks and pierces a flat part in one press stroke, often with good location control between the outside profile and internal holes. It is worth reviewing for flat washers, shims, brackets, terminals, and simple blanks when the part does not need many progressive forming stations.
A mate pūhui is not the same as a mate ahu whakamua. In a mate ahu whakamua, the strip moves through stations and the part is completed step by step. In a mate pūhui, several cutting actions happen at the same station. For the right flat part, this can simplify tooling, hold hole-to-profile relationship well, and make inspection easier. For a formed part with bends, tabs, coining, embossing, or secondary hardware, a progressive route may still be the better choice.
Use this page with the mate ahu whakamua design checklist, fine blanking guide, blanking process guide, and tooling cost guide.
Where compound dies fit best
| Wāhanga type | Why mate pūhui may fit | Check before quote |
|---|---|---|
| Washers and shims | Inside and outside profiles can be cut in one stroke. | Confirm flatness, burr side, edge condition, and packing method. |
| Flat terminals or tabs | Hole-to-edge control can be important for assembly or mating surfaces. | Mark whakapā zones, plating route, and critical datum features. |
| Simple brackets before bending | A blank can be made accurately before a separate forming step. | Ask whether secondary bending changes the cost or tāpae kātakí. |
| Prototype-to-production flat parts | A compound tool may be simpler than a full mate ahu whakamua. | Compare tool cost against annual volume and expected revisions. |
When a mate pūhui is not enough
If the part has several bends, drawn features, multiple embosses, in-die tapping, staking, or automatic insertion, a mate pūhui may become a partial answer rather than the production route. It might still make a blank, but secondary operations can drive total cost and wā tuku. Arotake the secondary operations guide and clinching and insertion guide if the print includes hardware or threaded features.
mate pūhui tā also does not remove the need for burr control. Because blanking and piercing happen together, the kaiwhakarato should define burr side, acceptable burr height, edge break requirement, and whether the part can be tumbled or must keep a sharp functional edge. For this detail, connect the quote with the burr control guide and deburring and edge break guide.
Cost and volume considerations
A mate pūhui may quote lower than a mate ahu whakamua when the part is flat and simple. But the comparison should include material yield, run speed, slug control, die maintenance, inspection, and packaging. A cheaper die that produces mixed slugs, scratches, or unstable flatness may not be cheaper after sorting and returns.
For low or moderate volumes, a buyer should also ask whether laser cutting, CNC punching, simple blank tooling, or a mate pūhui is the right bridge. For high repeat volume, tooling stability and maintenance records become more important. The low versus high volume cost guide and coil yield guide can help compare the quote.
RFQ details to include
- 2D drawing with material, thickness, tolerances, flatness, and burr side.
- Critical hole-to-profile, hole-to-hole, and edge distance requirements.
- Whether the part must stay flat or will be formed in a later operation.
- Surface finish, plating, passivation, cleaning, or cosmetic zones.
- Annual volume, release quantity, target unit price, and target wā tuku.
- Inspection method for critical features, including gage or CMM needs.
- Packaging and count method, especially for thin shims or small washers.
Inspection points
Ask for first article inspection that covers both the inside and outside profile. If the part is used as a shim, spacer, electrical whakapā, or locating washer, thickness, flatness, burr, and surface condition can be as important as the outline. For production controls, use the control plan checklist, AQL sampling guide, and incoming inspection checklist.
Tukuna drawings and volume assumptions through the whakapā page. If you are comparing mate pūhui, mate ahu whakamua, and laser-cut options, use the RFQ form to include current samples, target annual volume, and which dimensions are critical to assembly.
FAQ: mate pūhui tā
What is mate pūhui tā used for?
It is commonly used for flat parts where blanking and piercing can happen at one station, such as washers, shims, flat terminals, and simple blanks.
Is mate pūhui tā cheaper than mate ahu whakamua tā?
It can be cheaper for a simple flat part, but the decision depends on part geometry, production volume, secondary operations, tolerance, and inspection cost.
Can a mate pūhui make formed parts?
A mate pūhui is mainly used for cutting flat features. Forming may require a secondary operation or a different die route, depending on the part.
What should a mate pūhui RFQ include?
Include drawing, material, thickness, burr side, flatness, critical hole and profile dimensions, finish, volume, inspection needs, and packaging method.